Method of assembling tubular heat exchanger, tubular heat exchanger and method of restoring tubular heat exchanger (versions)

FIELD: engines and pumps, heating.

SUBSTANCE: proposed tubular heat exchanger comprises two heat exchanger section tube plates with the holes wherein attached are heat exchanger tubes to form tight joints. The heat exchange tubes fitted into tube plates, the pre-assembled heat exchange section tube plate is directed upward. Note that the anaerobic adhesive is applied on the tube plate outer surface edge and its each extending part in the amount corresponding to the volume of circular gaps between each tube and the mating hole in the tube plate to completely fill the circular gaps. Then, the joints are cured to form a polymer composition in the gap spaces. The said tubular heat exchanger is restored by separating heat exchange tubes from the tub plates and destructing the aforesaid polymer composition in the said gaps. The heat exchange tube and tube plate inner and outer surfaces are cleaned of dirt, worn-out tubes are replaced. Now, the re-assembly of heat exchange tube with tube plates is effected as described above. Similarly, the tubular heat exchanger with soldered, welded or flanged permanent joints can be restored.

EFFECT: simpler assembly and repair of tubular heat exchangers.

9 cl, 14 dwg, 5 ex

 

The invention relates to the field of engine development, energy and chemical engineering and can be used in the manufacture of heat exchangers as recuperative and regenerative types.

There is a method of Assembly of the heat exchanger consists in preparing in a tube plate mounting surfaces for heat exchange tubes, the installation of pipes and their connection with the tube boards in the welding method with various types of cutting edges welded parts [description of the invention to the U.S. patent No. 5101892 from 02.05 1991, NCL. 165-158, publ. 07.04.1992].

The use of different welding methods for joining heat exchanger with tube plates, including welding the annular bead on the inside of the pipe, is possible only for the case when the heat-exchange tubes are great, their number is small, and the heat exchanger is a small body of rotation. In all other cases, the known method is not applicable for use because of the high labor content.

A known method of manufacturing a tubular heat exchanger, which includes compression of the ends of heat exchange tubes, the installation objetych ends of the tubes into the corresponding holes of the tube plate and the expansion of the protruding above the plane of the tube plate parts tubes [description of the invention to German patent No. 3425382 from 10.07.1984, MPK VR 15/26, publ. 28.02.1985]. Gets the I reliable connection with two characteristic zones of tight contact of the ends of each tube with both surfaces of each tube plate.

A large number of identical structural elements requires the same amount of sample process operations. It is inevitable cases where the build quality is part of the heat exchange tubes in the heat exchanger will be different from the quality of Assembly of the remaining parts of the pipes, for example, due to the difference in length of the tubes fit the crimped end of the tube to the bottom plane of the tube plate will be incomplete. It is in these places it is possible the flow of the working medium or fluid. In addition, with the expansion of the multiple tubes of the same method the inevitable situation when the heat exchanger will lead in any direction.

Known way tight connection finned tubular heat exchanger element with a multilayer pipe Board heat exchanger comprising a flared each layer tube plate around the perimeter of openings, install in the hole of the neck of the heat transfer element on which you previously completed the protrusions with a height of 0.2-0.3 mm, the Surface of the cervix degreased, coated with a layer of adhesive, such as leikonat, and dried. Later in the cavity formed by the flanging of two adjacent layers of the tube plate around the perimeter of the hole and the neck of the heat transfer element is a sealing element of devulcanizing rubber layers of the tube plate is compressed by pressure on uplotnitel the th element, and the speaker of the tube plate at the end of the heat exchange element resultatives [description of the invention to the patent of Russian Federation №2064392 from 24.01.1991, IPC6VR 11/00, F28F 9/16, publ. 27.07.1996].

This method has a high complexity and does not apply to structurally complex heat exchangers with a large number of tubular heat exchange elements.

The task of the first invention group, and the technical result achieved is to create another method of assembling a tubular heat exchanger, characterized by relative simplicity and maintainability.

To solve the problem and achieve the desired technical effect in a tubular heat exchanger, including the installation of heat exchange tubes in the tube plate heat exchanger sections and their subsequent fixing and sealing after installation of heat exchanger tubes in the tube plate pre-assembled heat exchanger section of the guide tube Board up and at the junction of its outer surface and the protruding part of each heat exchange tube is applied a portion of the anaerobic adhesive, in an amount corresponding to the volume of the annular gap between each pipe and the return hole in the tube plate with subsequent filling of the annular gap, then the connection can withstand for the formation of a polymer composition in amounts of SASO is s, fixation and sealing of the tubes in tube sheets carried out at the expense of the obtained adhesive joints. Additionally, the orientation of the pre-assembled heat transfer section of pipe Board up for the application of anaerobic adhesives perform consistently for each side of the heat exchanger.

Known to most common construction tube mnogotranshevogo boiler, which is a feature of the connection of heat exchanger tubes and tube Board protruding above the plane of the tube plate of the pipe expanded [description of the invention to the U.S. patent No. 2152260 from 20.06.1938, NCL. 165-158, publ. 28.03.1939].

The disadvantages of this design are associated with the technology of rolling protrusions of the heat transfer tubes. With their large number of high probability that the tube plate leads relative to each other, and the Assembly process is very time-consuming.

Known design tube cooling heat exchanger, which is a feature of the connection of heat exchanger tubes and tube Board by means of soldering [description of the invention to the U.S. patent No. 4562887 from 18.08.1984, NCL. 165-158, publ. 07.01.1986].

When carrying out soldering requires high qualification of the shareholder, as it is very difficult to get on a solid product the same as the same type of soldered connections and the large number.

Known technical solution of the mounting of the heat exchange tubes in the tube lattice by welding the annular corner seam [description of the invention to German patent No. 3105736 from 17.02.1981, IPC321D 39/06, publ. 26.08.1982]. It can be assumed that in order to ensure satisfactory weldability material tube plate must match or be close to their physico-chemical properties of the material of the heat transfer tubes.

As you know, especially when welding closed seams connect parts of serious leads. Needed an expensive operation to remove internal stresses in welded construction. The result obtained by this technology, heat exchanger will vary by the complexity of manufacturing.

Known technical solution of the mounting tube in the hole by means of pressing, which boils down to the fact that during the depths of the holes of the tube wall deformirovny with a repetition of the complex profile of the hole with the formation of the seal type of the labyrinth and expanding the edges of the tubes adjacent to both the planes of the tube plate [description of the invention to German patent No. 3411458 from 28.03.1984, IPC421D 39/06, publ. 10.10.1985].

Reliable sealing and build quality require high labor costs. In addition, such a heat exchanger can not be disassembled, for example for e what about the repair and recovery.

Known tight connection of the tubular heat exchange element with a multilayer pipe Board heat exchanger by means of the sealing element type ring made of rubber, and expanding the free end of the heat exchange tubular element [Cm. description of the invention to the previously mentioned patent of the RF No. 2064392].

The design of this heat exchanger is particularly complex and requires the use of several different technologies Assembly, that in case of leaks makes it beyond repair.

The task of the second invention group, and the technical result achieved is to create such a design of the heat exchanger, which will differ relative simplicity and high maintainability.

To do this in a tubular heat exchanger comprising two tube plate heat exchanger section with holes, into which is fixed the tubes with the formation of tight junctions, tight fastening of the heat transfer tubes in the second hole tube plates made of glutinous education in the annular gaps between them a layer of the polymer composition. Additionally, the polymer composition is made using anaerobic glue.

Known way to restore corrosion-resistant tubular heat exchanger, which is the conclusion of what is in the provision of particular types of flows of liquids, one of which passes through squeezed between the tube boards of heat exchange tubes, and the other washes them, passing through the inner cavity of the hull. If necessary, disassembly of the heat exchanger tube plate away from the flanges of the casing and divorced in hand, when this tube is released and you can examine them for wear [description of the invention to the U.S. patent No. 5323849 from 21.04.1993, NCL. 165-158, publ. 28.01.1994].

Method of disassembly and re-Assembly of the present heat exchanger is-low-tech as to provide mechanical, sealed, normalized by the axial force of the frictional connection telescopically connected tubes and tube boards is very difficult. It should be borne in mind that fluctuations in temperature environments may cause thermal deformation of the axes of the tubes of the telescopic connection will work on compression and can occur depressurization compounds and mixing of two streams of liquids.

The known method of repair (recovery) water-oil heat exchanger or air cooler, which includes disassembly, cleaning scum and dirt, eliminating leaks in the pipes by soldering, culling of worn-out pipes, and installing them in caps [Technology repair locomotives: a Textbook for colleges W.-D. transp. Edited by Ivanov V.P. - M.: Transport, 1987, p.205 and 206]. This method Voss is the resolution of the tubular heat exchanger is the most common and reliable, however you have to sacrifice a part of heat exchange tubes, the inner channels are set plugs. The number of plugged tubes should not exceed more than 5% of their total number.

The quality of such recovery heat exchanger is not high enough, because it is very difficult to establish the degree of wear of heat exchanger tubes without breaking it. For this reason, the lifetime of recovered heat exchanger, as a rule, much lower than the period of holding, for example, regular maintenance of the engine, for cooling which it was intended.

The task of the third invention, and the technical result achieved is to create a way to recover a tubular heat exchanger, a tight connection which is made adhesive, characterized by relative simplicity and reliability.

For this method to restore a tubular heat exchanger involves separating the heat exchange tubes from the tube sheets of the heat exchange section with the prior destruction glued with education in the annular gaps between each pipe and the return hole in the tube plate layer polymer compositions, cleaning the interior and exterior surfaces of heat exchanger tubes and tube sheets from dirt, culling of worn-out pipes and the Assembly th the exchange with tube plates with replacement of worn-out pipes on new and/or installation of the plugs into the holes in the tube sheets, the Assembly of heat exchanger with tube plates of heat exchanger sections carry out the previously described method of Assembly of a tubular heat exchanger using anaerobic adhesive (item 1 of the claims). Additionally, the destruction layer of polymer composition in the annular gaps between each heat exchange tube and a return hole in the tube plate heat exchanger section is carried out by high-temperature pipe on the Bulletin Board.

Described above for the third present invention the prior art is applicable to the fourth invention group.

The task of the fourth invention, and the technical result achieved is to create another method to restore a tubular heat exchanger, also characterized by relative simplicity and maintainability.

For this method to restore a tubular heat exchanger involves separating the heat exchange tubes from the tube sheets of the heat exchange section with the preliminary destruction of the permanent connection of each pipe with a return hole in the tube plate, cleaning the interior and exterior surfaces of heat exchanger tubes and tube sheets from dirt, culling of worn-out pipes and the Assembly of heat exchanger tubes and tube plates, replacement of worn-out pipes on new and/or installing filler brackets are suitable the e orifice tube plates, at this location disassembled joints of each heat pipe with a return hole in the tube plate heat exchanger sections are calibrated, and the Assembly of heat exchanger with tube plates carry out the previously described method of Assembly of a tubular heat exchanger using anaerobic adhesive (item 1 formulas invention).

In addition,

the destruction of the permanent connection of each heat pipe with a return hole in the tube plate heat exchanger section is carried out by high-temperature pipe on the Board;

the destruction of the permanent connection of each heat pipe with a return hole in the tube plate heat exchanger section is carried out by the destruction and removal of existing mechanical linkages, and calibration of holes in the tube plate further includes making chamfers from destroyed and remote mechanical linkage, the ends of heat exchange tubes have been advocating edge chamfers.

The invention illustrated by the drawings,

where figure 1 shows a General view of the heat transfer section of the tubular heat exchanger;

figure 2 shows a combined view As in figure 1 - view of the heat transfer section side view and cross section b-B;

figure 3 shows the position In figure 1 connection of heat exchanger tubes and tube Board by means of a layer of polymeric composition;

n the figure 4 shows the connection of heat exchanger tubes and tube Board by soldering;

figure 5 - the hole in the tube plate 4, calibrated after disassembly solder joints;

figure 6 - recovered compound 4 using a layer of polymer composition;

7. connection of heat exchanger tubes and tube Board with expanding;

on Fig. connection 7 with the remote site expanding;

figure 9 - the hole in the tube plate 7, calibrated after disassembly flared connection;

figure 10 - the restored connection 7 with the use of a layer of polymeric composition;

figure 11 - connection of heat exchanger tubes and tube Board by welding;

on Fig connection 11 with a broken weld seam;

on Fig - hole in the tube plate 11, calibrated after the destruction and dismantling of the welded connection;

on Fig - restored connection 11 with the use of a layer of polymeric composition.

The method of assembling a tubular heat exchanger includes the installation of the heat transfer pipe 1 into the pipe plates 2 and 3, the coil 4 (see Fig 1 and 2) and their subsequent fixing and sealing, which after installation of the heat transfer pipe 1 into the pipe plates 2 and 3 pre-assembled heat exchange section 4 a guide tube Board 2 (or 3) up and at the junction of its outer surface 5 (or 6) and the protruding sections 7 (or 8) ka the DOI heat pipe 1 is applied to the portion of the anaerobic adhesive in the amount the corresponding volume of the annular gap 9 between each pipe 1 and the counter-bore 10 in the tube plate 2 and 3, followed by filling the annular gap 9, after which the connection can withstand for the formation of a polymeric composition 11 in the amount of gaps 9 and the securing and sealing of the tubes 1 in the tube plate 2 or 3 exercise resulting adhesive joints (see figure 3). It should be noted that the orientation of the pre-assembled heat exchanger heat transfer section 4 pipe Board 2 (or 3) up for applying an anaerobic adhesive performed sequentially for each side, i.e. first, work with a heat exchange section, oriented upward pipe Board 2, and then up the tube Board 3, or Vice versa.

Thus obtained tubular heat exchanger includes two tube sheets 2 and 3, the coil 4 with holes 10, in which is mounted the tubes 1 (or multiple heat exchanging tubes 1) various designs, such as smooth, with fins (as shown in figure 3) and so on, with the formation of tight junctions, while the sealed fastening of the heat transfer tubes 1 in the second holes 10 tube plates 2 and 3 are made of the adhesive with the formation of the annular gap 9 between the layer of polymeric composition 11, which is made using a one-component liquid or gel is brasego, or any other anaerobic adhesive, produced by domestic industry (for example, see the catalogue of the Compositions of anaerobic sealant (sealant). The acrylic adhesives. The Federal state unitary enterprise "Institute of polymers", Dzerzhinsk, 1999) or its foreign counterparts, distributed under the trademarks EuroLoc®LOCTITE®, AGA and other

If manufactured as described above tubular heat exchanger will require major repairs, it can be restored. Method of recovering tubular heat exchanger includes separation of the heat transfer tubes 1 tube plates 2 and 3, the coil 4 with advanced destruction glued with the formation of the annular gap 9 between each pipe and the return hole 10 in the tube plate 2 or 3 layers polymer composition 11, the cleaning of the inner 12 and outer surfaces 13 of the heat transfer tubes 1 and the surfaces 5 and 14, 6 and 15 of the tube plates 2 and 3 from contamination, which serve as rust, scale, sintered oil, etc. (including residues from the polymer composition), culling of worn-out pipes and the Assembly of heat exchanger tubes 1 tube boards 2 and 3 with the replacement of worn-out pipes on new and/or install plugs (conventionally not shown) into the holes in the tube plates 2 and 3, the Assembly of the heat transfer pipe 1 pipe 2 boards and 3 heat transfer section 4 done is make the previously described method of Assembly of a tubular heat exchanger using anaerobic adhesive. It should be noted that the destruction layer of polymer composition 11 in the annular gap 9 between each heat transfer tube 1 and the counter-bore 10 in the tube plate 2 (or 3) heat transfer section 4 is carried out by high-temperature pipe Board 2 (or 3), in which there is destruction of intermolecular adhesive bonding, and section 4 can be easily disassembled into components.

If recovery is subject to the tubular heat exchanger and collected in a manner different from the claimed as the invention, it also separates the heat exchanger pipe 1 from the tube plates 2 and 3, the coil 4 with the prior destruction of permanent solder 16, 17 or expanded welded 18 connection of each pipe 1 with a return hole 10 in the tube plate 2 and 3, the cleaning of the inner 12 and outer surfaces 13 of the heat transfer tubes 1 and the surfaces 5 and 14, 6 and 15 of the tube plates 2 and 3 from dirt, culling worn-out pipe 1 and the Assembly of heat exchanger tubes 1 with pipe boards 2 and 3 with the replacement of worn-out pipes on new and/or install plugs (also conventionally not shown) into the holes 10 of the tube plates 2 and 3, in this place is disassembled compounds 16, 17 and 18 of each heat pipe 1 with a return hole 10 in the tube plate 2 and 3 are calibrated, and the Assembly of heat exchanger tubes 1 tube boards 2 and 3 in heat transfer section 4 is realized by the previously described method of Assembly of a tubular heat exchanger using anaerobic glue.

It should also be noted that the destruction of one-piece solder 18 of each heat pipe 1 with a return hole 10 in the tube plate 2 and 3, the coil 4 is carried out by high-temperature pipe Board 2 (or 3). The destruction of one-piece beams 17 or welded 18 links each heat pipe 1 with a return hole 10 in the tube plate 2 and 3, the coil 4 is carried out by the destruction and removal of existing mechanical connections (flanges and welds), and the calibration of the holes 10 in the tube plate 2, or 3 further includes making chamfers 19 from destroyed and remote mechanical connections (flanges and welds), the ends of heat transfer tubes 1 have been advocating edge chamfers 19.

In the patent literature contains information on the use of self-curing adhesive compositions, for example, the repair of shut-off valves [see the description of the invention to the patent of Russian Federation №2122671, IPC6F16K 3/14, publ. 27.11.1998, bull. No. 33]. However, in these cases, the adhesive compositions are used only for fixing in a predetermined position of the cut threads with wear compensation in detail wedge gate valves. For sealing of the compounds obtained using provideproperty elements located between the annular radial projection is mi saddles and mating surfaces of the housing. In fact, here we are talking about individual repair previously lapped wedge connection with re-finishing of the rubbing surfaces. The gluing is possible to reduce the accuracy requirements for the manufacture of two threaded connections. With the same success you could use paint, PREROLL foil, and subject to the appropriate approval for the manufacture of thread lock compounds could be provided automatically by the resulting frictional forces. I.e. opportunities adhesive technologies are not being used for its intended purpose, as a way of creating permanent joints, and as an affordable means of fixation of the two parts, made, apparently, of dissimilar materials and located in an awkward manipulation of the tool.

Currently, to solve specific technological problems, and it is claimed as inventions, we have developed special additives to adhesives and glues with specified physical and chemical properties capable of operating at high temperatures in aggressive environments, etc.

The advantages of the adhesive Assembly technology tubular heat exchangers and restore previously operated heat exchangers are manifested primarily in the fact that it provides an Assembly of a multitude of similar compounds is the same product. The number of connections heat exchanger with tube plates on some coils can reach several hundreds. Use for their Assembly technologies, for example, plastic deformation directed force causes the heat-exchange tubes of internal stresses and, accordingly, deformations, which are summarized in proportion to the number of pipes. Internal deformation superimposed thermal deformation arising from the operation of the heat exchanger. Ultimately increases the likelihood of seal failure device, for example, due to the occurrence of microcracks, which can manifest itself at the most inopportune moment during the operation of the same power plant. The solution may be used, where possible, pipes made of plastic non-ferrous metals, with copper pipes is more preferable as compared with the pipes of aluminium alloys, but it is not always possible. For this reason, the requirements for the heat exchanger, should allow guaranteed operation at least during the period between overhauls certain installations, for maintenance of which it was designed and constructed.

On welded heat exchangers these shortcomings manifest themselves even more. Also with the ois disadvantages exist in brazed heat exchangers and heat exchangers, collected with the use of sealing gaskets, o-rings, etc.

The advantage of using the adhesive Assembly of heat exchangers is that the polymer composition 11 freely compensates in the process of Assembly and further operation of linear and thermal deformation of the pipe 1. This does not provide none of the existing technologies for the Assembly of tubular heat exchangers.

Consider the examples of the inventions.

Example 1. The construction of the tubular heat exchanger consider the example of Assembly of its heat transfer section, as illustrated in Fig.1-3, and 6, 10 and 14.

First prepare blanks for heat transfer section 4. It will heat exchanger tube 1, made in the required quantity, for example of copper, and two steel tube sheets 2 and 3 with the holes 10 - the number of pipes 1.

On a flat base stack pipe Board 3, for example, as more massive, with less protruding parts, and so on, and corresponding holes 10 vertically insert the tubes 1. If necessary, a pipe Board 3 insert the rack 20, the purpose of which is to prevent buckling of the pipe 1 with a further mounting and fixing the coil 4 in the case of the heat exchanger. On top of the pipe 1 pipe wear Board 2 (less massive, having the Yu protruding parts etc.), combining with its holes 10 corresponding ends of the pipe 1, is fixed in a special mounting seats 20 hours, while for ease of Assembly and provide the necessary technological dimensions, for example, values protruding from the outer surfaces 5 and 6, sections 7 and 8 of the pipe 1, can be used a variety of special devices. Preassembled heat exchanger section 4 is subjected to final Assembly using, for example, vibratory oscillations to part took the most natural position with zero internal stress. In this form the heat exchange section you can secure by using, for example clamps, after which it is ready for gluing.

For each pipe 1 in the place where their parts 7 protrude above the surface 5 of the tube plate 2, is applied to a portion of the adhesive in an amount corresponding to the volume of the annular gap 9. The glue penetrates into every gap 9, filling it and lipase with each of the connected surfaces. The connection pipe 1 with the Board 2 stand for the formation of a polymeric composition 11, for which there is technologically established for each grade glue the minimum time and temperature, for example, at least one hour at temperatures below 10-15°C. During this time, the gap 6 in the absence of oxygen and with the assistance of ionometry is the polymerization of the adhesive with the formation of permanent connection with the function of the seal.

The heat exchanging section overturn pipe Board 3 up and repeat the process of applying glue on the border of parcel 8 of the tube 1 with the surface 6 of the tube plate 3.

If you apply glue smaller than required to fill the gap 9, the connection may remain fistula and the heat exchange section will be unusable due to the lack of tightness. If glue is to be applied more than necessary to fill the gap 9, the excess will leak outside of the gap 9. The connection will eventually be good, but will overrun expensive product - glue. The same applies to a method of applying adhesive to connect parts of dipping in a special bath with glue. However, the final adhesive is selected individually on the basis of the optimum designed for data production process conditions.

Similarly, as for the case with the tube Board 2, the heat exchange section 4 in position pipe Board 3 stand up for education polymeric composition 11.

The optimal regime are keeping 24-26 hours and the temperature of 20-24°C. During this time, there is a complete polymerization of the adhesive. Thus, a reliable sealing of the obtained compounds and their strong hold.

The values of the modes that are smaller and lower than optimal, leading to the WMD, that the adhesive may not be able to polymerization in a proper way, and possibly uncontrolled displacement of the parts in the Assembly process, resulting in the premature use of the heat exchanger directly to loss of tightness and undesirable leakage of working medium. The use of special additives can accelerate the process of polymerization of the adhesive at temperatures close to 5°but usually assembled products provide the ability to stick for the formation of polymeric composition in a natural way, for example, instead of the usual 24 hours product was incubated for 3-4 days, i.e. with a stock over time.

Values modes shutter speed and temperature above the optimum will lead to unnecessary prolongation of manufacturing heat transfer section and, in addition, will not improve significantly the strength of the pipe connections and tightness.

Thus, the produced heat exchange section 4 is mounted in the housing of the heat exchanger and the finished product is sent to complete, for example, high-power marine engine.

It should be noted that after a certain time, for example three to five years, the same ship engine stops for a major overhaul. In this case, it is expedient to carry out major repairs of the heat exchanger, i.e. its recovery.

Example 2. SPO is about recovery tubular heat exchanger, manufactured using adhesive technology of the Assembly illustrated in figure 1-3 and, to some extent, 5, 6, 9, 10, 13 and 14.

Used heat exchanger assort to discharge the composition of the heat transfer section 4 assembled using adhesive technology. Then section 4, where possible, is subjected to preliminary remediation, and cleaning are the inner 12 and outer surface 13 of the tube 1 and the surface 5 and 14, 6 and 15 of the tube plates 2 and 3.

Next, section 4 have a pipe Board 3 upwards as, for example, more massive and warm up the temperature when the polymer composition 11 begins to permanently lose its physical properties. Typically, this is 350-400°C or higher. On reaching the set temperature of the tube sheet 3 can be easily removed from the pipe 1. Then start heat pipe Board 2. As the heat pipes 1 are sequentially removed and stored.

After disassembly of the heat transfer section 4 of the heat exchange tube 1 and the tube plate 2 and 3 completely cleansed from pollution (including from glue residue), and cleaning and also at the inner 12 and outer surface 13 of the pipe 1, the surface 5 and 14, 6 and 15, and all openings 10 tube plates 2 and 3. Worn to excess heat pipes 1 are drafted out and replaced by new ones. If there is RUB 1 to replace worn, then prepare special plugs for the unoccupied part of the holes 10.

The recovery process of the heat exchanger repeats in detail the method of assembling a tubular heat exchanger described in example 1, adjusted for additional installation plugs, if needed, including using adhesive technology they are committed, as well as welding, brazing, etc.

Example 3. Method of recovering tubular heat exchanger assembled with the use of soldering, is illustrated in figure 4-6.

Used heat exchanger assort to discharge the composition of the heat transfer section 4, collected using a brazing process. Then section 4 is subjected to the contamination by type described in example 2.

Section 4 include, for example, a pipe Board 3 up and warm up the temperature when the solder begins to melt. Depending on the solder, it is usually a little less or a little more than 550°C. Upon reaching the desired temperature tube sheet 3 is removed from the pipe 1. After that then heat the solder connection tube plate 2. As they heat pipes 1 are sequentially removed and stored.

After disassembly of the heat transfer section 4 of the heat exchange tube 1 and the tube plate 2 and 3 completely purified, for example, mechanically from the remnants of solder or any other means from the rest of the s pollution. Cleaning exposed and the inner 12 and outer surface 13 of the pipe 1, the surface 5 and 14, 6 and 15 and all openings 10 tube plates 2 and 3. Holes 10 from the side surfaces 5 and 6, if necessary, perform a chamfer 19, the function of which is to ensure flow of the adhesive in the annular gap 9. Worn to excess heat pipes 1 are drafted out and replaced by new ones. If there is no pipe 1 at replacing worn out, you can also prepare special plugs for the unoccupied part of the holes 10.

Further, the recovery process of the heat exchanger repeats in detail the method of assembling a tubular heat exchanger described in examples 1 and 2.

Example 4. Method of recovering tubular heat exchanger assembled using plastic deformation (expanding) the edges of the pipe, is illustrated in Fig.7-10.

Used heat exchanger assort to discharge the composition of the heat transfer section 4, collected using the technology of plastic deformation (expanding) the edges of the pipe 1. Then section 4 is subjected to the contamination by type described in example 2.

Section 4 have so Molen was easy to produce mechanical treatment, e.g. grinding surfaces 5 and 6 of the tube plates 2 and 3 until that moment when their surfaces will not remain expanded elements of the pipe 1. Pipe DOS and 2, 3 and heat exchanger tube 1 understand. It may be that in the long-term operation of the heat exchanger happened mutual diffusion of metal of the heat transfer tube 1 and tube plates 2 and 3. These tubes are cut off and in their place we will have to put a stub.

So, after disassembly of the heat transfer section 4 of the heat exchange tube 1 and the tube plate 2 and 3 are cleared, for example, mechanically from burrs and any other ways from other contaminants. Cleaning and also at the inner 12 and outer surface 13 of the pipe 1, the surface 5 and 14, 6 and 15 and all openings 10 tube plates 2 and 3. Holes 10 from destroyed and remote mechanical linkages perform chamfer 19, the function of which is to ensure flow of the adhesive in the annular gap 9. Worn to excess heat pipes 1 are drafted out and replaced by new ones. If there is no pipe 1 at replacing worn out, you can also prepare special plugs for empty tubes 1 part of the holes 10.

Further, the recovery process of the heat exchanger repeats in detail the method of assembling a tubular heat exchanger described in examples 1 and 2, adjusted for the fact that when assembling the ends of the heat exchanging tubes 1 have been advocating edge chamfers 19 for better flow of the adhesive into the gap 9.

Example 5. Method of recovering tubular heat exchanger assembled with the aid the receiving welding, illustrated 11-14.

Used heat exchanger assort to discharge the composition of the heat transfer section 4 assembled using welding technology. Then section 4 is subjected to the contamination by type described in example 2.

Section 4 have so that you can easily produce mechanical treatment, e.g. grinding, reamer (as shown in Fig), etc. surfaces 5 and 6 of the tube plates 2 and 3 until the moment when the ring welds 18 will be destroyed to such an extent 18', when it will be possible disassembly of the pipe 1. The tube plate 2, 3 and heat exchanger tube 1 understand.

After disassembly of the heat transfer section 4 of the heat exchange tube 1 and the tube plate 2 and 3 are cleared, for example, mechanically from burrs and any other ways from other contaminants similar to the above examples 2-4. In the calibrated holes 10 from destroyed and remote mechanical linkages also perform chamfer 19, the function of which is to ensure flow of the adhesive in the annular gap 9. Worn to excess heat pipes 1 are drafted out and replaced by new ones. If there is no pipe 1 at replacing worn out, you can also prepare special plugs for empty tubes 1 part of the holes 10.

Further, as in examples 1-4, with the amendment that during Assembly, the ends of the heat exchange what's pipes 1 have been advocating edge chamfers 19 - for the best flow of the adhesive, and the important is the protrusion of the ends of this edge chamfers 19 and not necessarily beyond the outer plane of the tube plates 2 and 3. This should be considered when for a number of reasons, such as compliance with the terms of the interchangeability of the nodes, the dimension between the outer planes tube plates 2 and 3 in heat transfer section 4 should remain constant, etc.

Thus, the most common of the possible examples of use of inventions.

In the solution of tasks was developed another method of assembling a tubular heat exchanger designed and its design, which is characterized by relative simplicity and high maintainability. Besides, they have developed another reliable methods for recovering tubular heat exchanger, manufactured using the adhesive Assembly technology, as well as previously made using solder, weld, and other permanent connections.

1. The method of assembling a tubular heat exchanger, including the installation of heat exchange tubes in the tube plate of the heat exchange section with the formation of tight junctions, characterized in that tight connection of the tubes in the tube plate is obtained using anaerobic adhesive, which after installation of heat exchanger tubes in the tube plate previously with the early heat exchange section of the guide tube Board up and on the boundary of its outer surface and the protruding part of each heat pipe is applied anaerobic adhesive with subsequent filling of the annular gap between each pipe and the return hole in the tube plate number corresponding to the amount mentioned annular gap, then the connection can withstand before formation of the polymeric composition in the above-mentioned gaps.

2. The method according to claim 1, characterized in that the orientation of the pre-assembled heat transfer section of pipe Board up for the application of anaerobic adhesives perform consistently for each side of the heat exchanger.

3. Tubular heat exchanger comprising two tube plate heat exchanger section with holes, into which are tightly installed the tubes, wherein the tubes in the second hole tube sheets tightly installed with glue, filling the annular gap between them in the form of a layer of polymeric composition.

4. The heat exchanger according to claim 3, characterized in that to fill the mentioned annular gap anaerobic adhesive used.

5. The method of restoring the tubular heat exchanger according to claim 3, including separation from the tube sheets in heat transfer section of the heat exchange tubes by destroying the layer of polymeric composition in the annular gaps between each pipe and the return hole in the tube plate, cleaning the interior and exterior surfaces of heat exchanger tubes and tube sheets from dirt, culling of worn-out pipes and the installation of th the exchange tubes in the tube plate with the replacement of worn-out pipes on new and/or installation of the plugs into the holes in the tube sheets, the installation of heat exchange tubes in the tube plate of the heat exchange section of the tubular heat exchanger is carried out in accordance with the method of its Assembly according to claim 1.

6. The method according to claim 5, characterized in that the destruction layer of polymer composition in the annular gaps between each heat exchange tube and a return hole in the tube plate heat exchanger section is carried out by high-temperature pipe on the Bulletin Board.

7. The way to restore a tubular heat exchanger, including the Department of heat exchange tubes from the tube sheets of the heat exchange section by destroying the permanent connection of each pipe with a return hole in the tube plate, cleaning the interior and exterior surfaces of heat exchanger tubes and tube sheets from dirt, culling of worn-out pipes and the installation of heat exchange tubes in the tube plate with the replacement of worn-out pipes on new and/or installing plugs in not occupied by the pipe hole pipe boards, the calibration of the places disassembled joints of each heat pipe with a return hole in the tube plate, with the installation of heat exchange tubes in the tube plate of the heat exchange section of the tubular heat exchanger is carried out in accordance with the method its Assembly according to claim 1.

8. The method according to claim 7, characterized in that the destruction mentioned permanent connections carry high atemperature impact on the tube Board.

9. The method according to claim 7, wherein when performing the said permanent connection with the use of mechanical linkages carry out their destruction by mechanical processing, and calibration of holes in the tube plate perform the chamfer on the part destroyed and remote mechanical linkage, the ends of heat exchange tubes have been advocating edge chamfers.



 

Same patents:

The invention relates to the field of metal forming, namely the processes of formation of permanent joints on pipes using the effect of local deformation of the intermediate element in the form of a sleeve of plastic material

The invention relates to the processing of metals by pressure and can be used when attaching the tubes of heat exchangers using the effect of localized directional plastic deformation of the pipe material

The invention relates to the processing of metals by pressure and can be used when attaching the tubes of heat exchangers using the effect of localized directional plastic deformation of the pipe material

The invention relates to the field of metal forming and can be used when attaching the tubes of heat exchangers using the effect of localized directional plastic deformation of the pipe material

The invention relates to the field of metal forming and can be used in the combined fixation of the tubes by mechanical rolling and welding

The invention relates to the field of metal forming, in particular to the processes of the combined fastening of the tubes by mechanical rolling and welding

The invention relates to the processing of metals by pressure and can be used when fixing the pipe with bimetallic profiled ends in tube sheets of heat exchangers

The invention relates to the processing of metals by pressure, in particular to the process of fixing the pipes in the pipe hole heat exchangers using the effect of localized directional plastic flow of the material pipe

The invention relates to the field of metal forming and can be used when attaching the tubes of heat exchangers

The invention relates to the field of metal forming

FIELD: technological processes; heating.

SUBSTANCE: inventions may be used in manufacture of units for unit-sectional devices for recovery of heat from gases exhausted by devices, which are intended, in particular for heating of air by exhaust combustion products that are supplied from gas pumping set gas turbine unit compressor at compressor stations of gas mains. Technological complex of equipment comprising technologically connected posts is used to manufacture bodies of heated air supply and drain headers, pipes, tube plates with openings for pipes, elements of heat exchanging unit frame, panel of tube medium displacer. Pipes are bent at pipe-bending equipment, frame of heat exchanging units and headers are installed, where tube plates are welded in. Multiple-row bundle of pipes are loaded with different pitch and are installed in device for storage of pipes.

EFFECT: higher efficiency of heat exchanging devices and their units manufacture.

39 cl, 25 dwg

FIELD: motors and pumps.

SUBSTANCE: invention may be used for production of heat-exchanging units for air-cooled gas apparatus, mainly for air pumping compressor stations. Process equipment system includes production racks of heat-exchanging structures, gas inlet header and cooled gas outlet header, gas inlet and outlet chambers, central support element under motor fan and hydraulic testing racks. Slip ways for heat-exchanging structures production include process supports provided with coordinate-screed and coordinate-fixing devices. Slip ways of gas inlet header and cooled gas outlet header production includes mounting supports for header body, central T-shaped section and H-frame structures with mounting devices. Production slipways for central support element under motor fan include structures with support-screed surfaces and support platform. The platform is comprised of support plates for assembling central support element under motor fan.

EFFECT: high-precision production and assembling of structures and reduced power and labour intensity during production process.

20 cl, 12 dwg

FIELD: heating systems.

SUBSTANCE: inventions can be used when manufacturing blocks for block-and-sectional devices intended for utilising the plant exit gas heat, and namely for heating the air by exhaust combustion products coming from gas turbine plant compressor of gas-compressor unit at gas main pipeline compressor stations. At process stations there manufactured are frame members of blocks, members of heated medium supply and discharge header casing as well as tubes and tube plates with holes meant for the tubes. The latter are bent with a tube-bending machine thus producing multi-pass tubes. There mounted is heat exchange block frame and headers whereinto tube plates are welded. Multi-row tube bundle is put together in a block. At least a number of tubes of the multi-row bundle is arranged with a various pitch.

EFFECT: invention improves manufacturing efficiency of heat exchangers and blocks being a part of heat exchangers.

27 cl, 20 dwg

FIELD: technological processes.

SUBSTANCE: invention may be used in modernisation of horizontal machines of air cooling with heat exchanging sections that have welded undetachable chambers of rectangular shape. In the back wall chambers form at least one window for access to internal surface of pipes and their cleaning from the products that have been accumulated in the process of air cooling machines operation. The window has circular shape or shape of two circles joined to each other. Centre of circle coincides with axis of one of the openings of tubular grid. Centres of two circles coincide with axes of corresponding openings of tubular grid. Mentioned windows are covered with shields with sealing gaskets made of soft metal or soft nonmetal gasket material. Shields are fixed with the help of threaded plugs that are installed in the openings of back wall, which are closer to the shields.

EFFECT: increase of servicing convenience and machines reliability and increase of service life.

4 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: invention relates to machine building and to machining, in particular. The method includes machining the workpiece surface layer with a cutting-tool with one rectilinear cutting edge and a plastic deformation of machined layer leaving it on the workpiece surface. Here, the tool with a cutting edge width greater than or equal to the width of the layer being machined makes a working motion perpendicular to the machined layer bend line in a plane aligned with its back surface and to the height of bent layer 1. Now, the machined layer gets bent and the tool returns to its initial position, then the tool or the workpiece is shifted by the machining cycle value and the cycle is ready to be repeated. To improve processing potentialities, prior to bending, the cutting tool is moved in the direction parallel to its forward surface up to the height of (0.4...0.6)l.

EFFECT: improved processing potentialities.

2 cl, 15 dwg

FIELD: processes for assembling of shell-and-tube heat exchangers in power engineering, petroleum processing, petroleum chemical, chemical, gas and other branches of industry.

SUBSTANCE: method involves assembling carcass by joining with the help of tightening devices and bypass preventive strips of tube and spacer grates; assembling tube bundle by packing carcass with heat-exchanging tubes; fixing heat-exchanging tubes in tube grates while embedding their ends and assembling tube bundle with shell made in the form of cylindrical enclosure, with tube bundle assembling process being performed before assembling thereof with shell. Shell used is of the type consisting of at least two parts produced by cutting cylindrical enclosure along generatrix thereof. Transverse strips are welded to shell part at sites corresponding to position of spacer grates. Tube bundle is assembled with shell by mounting onto tube bundle of shell parts to thereby define hermetically sealed volume of intertubular space. Shell parts are welded to one another and to tube grates, said welding process being performed provided that welded joints are positioned between parts of shell along longitudinal axis of heat exchanger.

EFFECT: simplified assembling process and increased heat exchange efficiency of shell-and-tube heat-exchanger.

4 cl, 18 dwg, 1 ex

FIELD: heat and power engineering, possibly manufacture of modules to apparatuses for recovery heat of waste gases of aggregates, for example for heating air by means of exhaust combustion products of compressor of gas turbine plant of gas pumping aggregate in compressor stations of main gas conduits.

SUBSTANCE: method comprises steps of piece-by-piece making blanks of shells of housings of manifolds for supplying and removing hated air, tubes, tube walls, module carcass members; bending tubes for producing flatly bent tubes having successively changed parameters of their branches and connection elbows; molding bent tubes; assembling manifolds at welding into them tube walls; mounting module carcass and manifolds; inserting tube bundle into module and again molding it together with manifolds inside module. Blanks of shells of manifold housings are prepared by cutting out metallic sheet for their further bending and welding. In prepared, mainly cylindrical blank rectangular port is formed for placing tube wall. Height of said port consists 0.72 - 0.95 of manifold height in module; its angular width consists of 0.07 - 0.25 of cross-section perimeter of shell of manifold. In tube wall openings are formed for creating tube field with surface area consisting 0.52 - 0.81 of common surface area of its frontal surface. At inserting tube bundles tubes are arranged by rows along height; distance between lengthwise axes of tubes in adjacent rows consists 0.6 - 1.5 of tube diameter. In rows adjacent by height tubes are shifted by 0.4 - 0.6 of pitch between lengthwise axes of rectilinear branches of tubes in row. Pitch consists of 1.5 - 2.3 of tube diameter.

EFFECT: enhanced technological effectiveness, lowered metal consumption, increased rigidity of product produced according to such method.

11 cl, 8 dwg

FIELD: power engineering, particularly gas cooling equipment.

SUBSTANCE: method involves producing least two intermediate header body sections provided with orifices adapted to receive connection pipes having flanges to connect thereof with gas inlet or outlet chambers of heat-exchanging section of the gas air-cooling plant; manufacturing end body members shaped as doubly curved bottoms; producing flanges with connection pipes; assembling and welding header body and welding bottoms to intermediate sections of header body. Header body is created by joining intermediate sections to central cylindrical one to form T-member having two coaxial cylindrical parts adjoining intermediate sections and having diameters of not less than intermediate section diameters. Adjoined to above cylindrical parts is the third cylindrical part adapted to be connected to gas pipeline. The third cylindrical part is inclined substantially at 90° to above cylindrical parts and extends substantially at 90° to plane passing through vertical axes of the connection pipes of intermediate sections. Diameter of the third cylindrical part is equal to 0.81-1.10 diameters of cylindrical body part. Technological support to facilitate manufacture of gas inlet and outlet header body or header body sections has frame with at least two support members, namely with support plates arranged from both sides from medium vertical plane of housing body to be produced and spaced apart from longitudinal axis thereof to support contact points in lower body half for radial distance corresponding to outer body radius. Each support member comprises not less than one flat part tangential to corresponding radius and arranged to be supported along cylindrical body section generator or cylindrical body part generator so that above radius is spaced an angular distance equal to 15-75° from vertical line in plane transversal to the generator in both opposite directions beginning from lower point of cross-section of the body or body section preferably shaped as solids of revolution.

EFFECT: increased manufacturability, reduced labor inputs and material consumption for header components assemblage, increased quality, reliability and service life of header characterized with elevated internal pressure due to optimized parameters of header body sections and technological supports, increased assemblage accuracy and improved header body stability during boring operations performing.

18 cl, 5 dwg

FIELD: the invention is designed for application in energy engineering namely it may be used at manufacturing of heat exchanging apparatus particularly for manufacturing of heat exchanging sections of gas air cooling apparatus.

SUBSTANCE: the mode of manufacturing of a heat exchanging section of a gas air cooling apparatus envisages manufacturing and assembling of a frame of a heat exchanging section, a chamber of input and a chamber of output of cooling gas with upper, lower walls, lateral walls forming correspondingly tube and exterior plates with openings, gables and at least one power bulkhead, assembling the walls of the heat exchanging section with wall dispersers-cowls of the flow of the exterior cooling environment predominantly of air, packing the heat exchanging section with a bundle of heat exchanging finned, single passing tubes with their installation in the heat exchanging section in rows along the height with dividing the rows with elements on different distances and fixing the ends of the tubes in the openings of the tube plates. At that the number n on a meter of the width of the transversal section of the bundle of the heat exchanging tubes is taken out of condition where FT - arelative total square of the heat exchanging surface of the bundle of finned tubes falling on 1 m2 of the square of the transversal section of the flow of the heat exchanging environment predominately of air taken in the diapason 72,4<FT < 275,8, a stretched magnitude; D1- a diameter of a heat exchanging tube with finning, m; D2 -a diameter of the same heat exchanging tube without finning, m; Δ -the thickness of the fin of the finning or an average thickness of a fin, m; Β - a pitch of the fin of the tube, m.

EFFECT: allows to decrease labor-intensiveness of manufacturing and assembling of a heat exchanging section of the gas air cooling apparatus at simultaneous increasing of heat exchanging effectiveness and manufacturability due to optimization of the quantity of heat exchanging tubes in a bundle and as a result of mass of elements of the chamber of input and of the chamber of output of gas namely tube and exterior plates, optimal number of openings in which their mass is decreased at simultaneous security of demanded solidity and longevity of separate elements of a heat exchanging section and as a result of the whole gas air cooling apparatus.

5 cl, 7 dwg

FIELD: the invention is designed for application in energy engineering namely in the technology of manufacturing and construction of heat exchanging sections of a gas air cooling apparatus.

SUBSTANCE: the mode of manufacturing of a heat exchanging section of a gas air cooling apparatus includes manufacturing predominantly on a loft of the lateral walls of the frame of the

section with wall displacers-cowls of air environment, assembling on a slip with support poles of the elements of the frame of the section - lateral walls, lower transversal beams and gas input-output chambers forming gables of the frame and also of frame rigidity elements with the following packing of the multi-row bundle with single-passing finned heat exchanging tubes with forming with them and the gas input-output chambers of a vessel working under pressure, installation of upper transversal beams and carrying out hydraulic tests of the assembled section. At that the terminal poles of the slip are executed with locating their leaning sites at different levels with height difference making ( 1,1-4,6)d, where d - an interior diameter of a tube of the bundle and at assembling the frame the gas input-output chambers are installed on the final poles of the slip.

The heat exchanging section of the gas air cooling apparatus is fabricated in accord with above indicated mode. The mode of manufacturing of the heat exchanging section of the gas air cooling apparatus includes manufacturing on the loft of the lateral walls of the frame of the section with wall dispersers-cowls of air environment, and also elements of rigidity of the frame, assembling on the loft with support poles of the elements of the frame - lateral walls , lower transversal beams and forming gables of the walls of the frame of the chambers of input-output of the gas and also of the elements of rigidity of the frame with following packing of the multi-row bundle out of single-passing finned heat exchanging tubes forming with their help and the gas input-output chambers of a vessel working under pressure, installation of upper transversal beams and carrying out of hydraulic tests of the assembled section. At that the low and the upper transversal beams of the frame of the section are installed along the length of the lateral walls with spacing overall of height marks, equal (0,12-),51)d, where d - an interior diameter of the tube of the bundle and cuts of different height predominantly for dimensions of the transversal section of the chambers are made for installation of gas input-output chambers on the final plots of the lateral walls in the upper belt and the overall part of the height of the walls. The heat exchanging section of the gas air cooling apparatus is characterized with the fact that it is manufactured in accord with this mode.

EFFECT: allows to increase manufacturability of fabricating of the heat exchanging sections at simultaneous lowering of metal consuming of construction, simplification of the process of fabricating and lowering labor-intensiveness.

13 cl, 10 dwg .

FIELD: machine engineering, possibly designing of units whose parts are subjected at operation to action of unstable or cyclic loads.

SUBSTANCE: method comprises steps of placing between surfaces of part interlayer of plastic material at relation of limit strength of interlayer material to that of material of each part no more than 0.6. It is possible to use flat washer of stainless steel with volume porosity 25 - 40% or metallic gauze interlayer that may be fixed by means welding or soldering. At joining turbine blade with impeller disc washer is placed between working surfaces of tooth of blade member and disc tooth and it is fixed on one of working surfaces.

EFFECT: enhanced operational reliability of loaded parts due to redistribution of local stresses caused by inaccuracy of manufacturing process.

7 cl, 3 dwg, 1 ex

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