Heat exchanger

FIELD: heating systems.

SUBSTANCE: invention refers to heat engineering and can be used during arrangement of high thermally stressed heat exchanger of nuclear power plant. In heat exchanger consisting of bank of heat exchange coil tubes the ends of which are fixed in tube sheets arranged in the form of a platen, straight sections of several coil tubes are located consequently in one plane, and bent sections are opened to the side from location plane of straight sections; at that, opening of bends of opposite ends, straight sections, is made to different sides.

EFFECT: providing maximum compactness of tube bank of heat exchanger and reaching high degree of heat exchange efficiency owing to arrangement of heat removal surface itself during operation, increasing life time of reliable operation of heat exchanger design at high specific thermal stresses of the volume occupied with it.

5 dwg

 

The invention relates to heat-exchange technique and is intended for use as a compact heat exchanger is part of separator-superheater high pressure (SPP) steam-nuclear power plant (NPP)operating on liquid metal coolant in the regime of variable loading.

Known shell-and-tube heat exchanger with a bundle of spiral twisted tubes shaped profile made twisted about its longitudinal axis with decreasing radius of the beam relative step twist and straight pipe ends having a length equal to the diameter of the input and output pipes with education in the casing collectors for environment annulus and porosity, greater porosity twisted part of the beam [1].

The disadvantage of this technical solution is the relatively low intensity of heat exchange between the heating and heated fluids in a heat exchanger construction as a whole and, consequently, low values of the output of the steam quality when using it as a modular heat exchanger, for example, in the composition of the CAF high-pressure steam-ship NPU.

Known single-threaded tubular coil, mainly for convective camera tube furnace containing a series of straight tubes arranged the staggered and United at the ends by bends with bend angle 180°, and last tubes of each row are provided with an additional outlets, the axes of which are located in the plane of the series, and the angle of bend is determined from the corresponding mathematical expressions [2].

The disadvantage of this technical solution is the deterioration process of heat exchange between the heating and heated fluids by increasing the depth of the layout of the tube bundle due to the increased hydraulic resistance to the flow of the moving fluid and, as a consequence, the reduction of resource of dependable performance of the design, since a large value of temperature difference between inlet and outlet of coolant leads to very significant damage in places of contact of metal pipes and their supporting structures.

The technical result of the invention is the provision of maximum compactness of the tube bundle heat exchanger and high efficiency of heat transfer due to the composition of the surface of the heat removal during operation, increasing the resource of reliable operation the design of the heat exchanger at high specific tallapragada occupied volume.

This technical result is achieved in that in a heat exchanger, consisting of a bundle heat exchanger coil pipe, the ends of which are secured in tube plates arranged in the form of screens, flat sections and W is gcih coiled pipe arranged in series in the same plane, and the bent sections diluted to one side from the plane of arrangement of straight sections, and wiring bends opposite ends, straight sections, performed in different directions.

Information retrieval of scientific and technical achievements on this topic, thematic analysis of the inventions of patent patent library Fund for the solution of this problem has not revealed the totality of distinctive characteristics that are similar (and inherent) with characteristics of the present invention, which can be used as a compact heat exchanger in the composition of the CAF high pressure pereprovedenii NPP operating on liquid metal coolant in the mode variable loads. In accordance with the current legislation of Russia, the invention meets the criteria of "novelty", "technology", "industrial applicability".

Summary of the invention is illustrated by drawings, where:

figure 1 is a longitudinal section of the heat exchanger;

figure 2 - cross section a-a;

figure 3 is a longitudinal section of the heat exchanger module;

figure 4 - shows a tube bundle;

figure 5 - shows a tube bundle with wiring bends.

The heat exchanger includes a housing 0 with the lower (upper) cover 1, the nozzle inlet 2 and outlet 3 of a heating fluid, input 4 and output 5 nagaimo liquid (wet steam), all pipes have the Kama is 6 distribution Teploobmennik liquids with a corresponding lid 7, the tube plate 8, which is connected modular heat exchangers 9 with the pipes 10 and 11, 12 and 13 by means of pipelines, and modular heat exchangers 9 relative to the body 0 distantierului struts 14. Each modular heat exchanger 9 has a chamber inlet 15 and outlet 16 of the fluid chamber inlet 17 and outlet 18 of the heated liquid, and the chamber inlet 17 and outlet 18 of the heated liquid are tube sheets 19 and 20, respectively, to which is attached a bundle heat exchanger coil pipe 21, the chamber inlet 15 and outlet 16 have coolant pipe perforated boards 22 and 23, respectively.

The heat exchanger works as follows.

Heating the coolant enters through the pipe 2 into the chamber 6 of the hand, from pipelines (not shown) enters the nozzle 10 of the modular heat exchanger 9 into the chamber 15 of the hand and perforated boards 22 in the tube space of the bundle heat exchanger coil pipe 21. Further, through the perforated Board 23 into the chamber 16, where through the pipe 11 and the pipe goes through the pipe 3. The heated fluid (wet steam) flows through the pipe 4 into the chamber 6 of the hand, from pipelines (not shown) in the socket 12 of the modular heat exchanger 9, further into the chamber 17 of the hand with the receipt in the cavity of the tube bundle heat exchanger coil pipe 21 into the chamber 18, where through the pipe 13 and t is unaproved in the chamber 6 and out through the pipe 5.

Performing a heat exchanger construction of the proposed form will allow you to use it as a modular heat exchanger with the most compact bundle heat exchanger coil pipe steam-ship NPP operating on liquid metal coolant in the mode variable loads that meet the requirements of reliability, maintainability, installation at high specific tallapragada occupied volume.

Literature

1. Dzyubenko BV and other shell-and-Tube heat exchanger. SU. A.S. No. 937954. F28D 7/00. Priority - 11.12.80. Publ. Bulletin of inventions No. 23. 23.06.1982 - equivalent.

2. Zincalu G.P. and other single-Threaded tubular coil. SU. Patent No. 1386637. C10G 9/20. Priority - 07.01.86. Publ. Bulletin of inventions No. 13. 07.04.1988 prototype.

The heat exchanger consists of a bundle heat exchanger coil pipe, the ends of which are secured in tube plates arranged in the form of a screen, characterized in that the straight sections of several coiled pipe arranged in series in the same plane, and the bent sections of divorced in the same direction from the plane of arrangement of straight sections, and wiring bends opposite ends, straight sections, performed in different directions.



 

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FIELD: power engineering.

SUBSTANCE: invention can be used in feed water heaters of thermal and nuclear power plants. Proposed heat exchanger consists of a shell inside which a central header and vertical tube platens connected with their ends to appropriate central header chambers are installed. At that each platen is made at least of one "П"-shaped section with transverse parts installed in the shell one above the other, and intermediate part wherein external tubes are installed longitudinally on the shell side, and internal tubes are located on the header side. Internal tubes of the intermediate section part are made with additional sections bent in the direction of central header and located between transverse parts of this section. In this case average tube length makes bigger in each platen, which leads to less number of tubes used in each platen, and therefore to velocity increase in tube and intertube spaces of platens and heat exchange intensification, which finally reduces heat exchanger specific amount of metal.

EFFECT: reducing thermal and hydraulic maldistributions in platens, which also improves platen heat exchange and reduces to a greater degree the heat exchanger specific amount of metal.

2 dwg

FIELD: mechanics, heating.

SUBSTANCE: in compliance with the invention, the heat exchanger-modular water heater incorporates one or two modules each comprising, at least, two heat exchanger units integrated by a diffuser to feed a cooling medium and a confuser to withdraw the medium to be cooled, primarily, a turbine hot exhaust gas. It also comprises the manifolds feeding and withdrawing the medium being heated, primarily, air, each communicating, via a tube plates fitted directly in the said manifold walls, with the multi-row bank of the four-pass heat exchanger variable standard-size pipes, the said standards sizes being calculated from the ratios covered by this invention and the aforesaid tube plates being secured by appropriated spacers. The multi-row bank can be made up of, at least, two trains of two-pass U-shape pipes integrated by the aforesaid manifolds and, at least, one bypass chamber.

EFFECT: high-efficiency heat exchanger, lower heat exchanger metal input, optimum design and spacers, higher design rigidity, simpler assembly of heat exchange pipe banks.

21 cl, 16 dwg

FIELD: mechanics, heating.

SUBSTANCE: in compliance with the invention, the heat exchanger-modular water heater incorporates one or two modules each comprising, at least, two heat exchanger units integrated by a diffuser to feed a cooling medium and a confuser to withdraw the medium to be cooled, primarily, a turbine hot exhaust gas. It also comprises the manifolds feeding and withdrawing the medium being heated, primarily, air, each communicating, via a tube plate, with, at least, one multi-row bank of multipass heat exchange pipes, the various pipes being furnished with bends varying in number from four to six and forming four rectilinear runs combining their three bends. Note here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. The unit of the heat exchange-modular air heater comprises four runs of the heat exchanger pipe multi-row four-pass bank, the said pipes being laid in horizontal rows spaced in horizontal and vertical planes, the manifolds feeding and withdrawing the medium being heated, each being connected, via separate tube plates, with heat exchanger pipes, each tube plate being mounted in the aforesaid manifold walls. Note here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. In compliance with the proposed invention, the aforesaid heat exchanger unit-modular air heater comprises a carcass, a bottom, and upper and lower casing walls, a diffuser to feed the medium to be cooled and a confuser to feed the aforesaid medium, manifolds feeding and withdrawing the medium to be heated and furnished with tube plates that form, in every row, an even number of rectilinear multi-pipe banks including, at least, two inner and two outer banks integrated by constant-radius bends. Note here that the unit housing bottom, cover and one of the side walls represent panels with a reinforcement framing elements forming a flat rod systems, while the unit carcass is formed by a set of the aforesaid flat rod systems with intermediate posts inter jointing the aforesaid systems and the manifolds housings rigidly fixed thereto and, in their turn, attached to the unit bottom and inter jointed via two-ring diaphragms and a pipe medium displacer. Note that the parts of the aforesaid manifolds housings with the aforesaid tube plates and pipe medium displacer fitted therein form, when combined, the unit housing rigid face wall while the side walls allow fastening the diffuser and confuser elements. Note here also that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. In compliance with this invention, the aforesaid heat exchanger unit-modular air heater incorporates a multi-row heat exchanger pipe bank made up of, at least, two bundles of two-pass U-pipes forming, within one bundle, two-run horizontal rows of pipes spaced apart both in rows and between rows, manifolds of feeding and withdrawing the medium being heated and, at least one bypass chamber arranged there between. Note here that the aforesaid manifolds and the bypass chamber communicate with the heat exchanger pipes via a common tube plate or separate tube plates, at least, one part of the said plates forming a part of the aforesaid manifolds enclosure walls. Note also here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs.

EFFECT: higher heat exchange efficiency, lower metal intensity of regenerative air heater.

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FIELD: mechanics, heating.

SUBSTANCE: in compliance with the invention, the heat exchanger-modular water heater incorporates one or two modules each comprising, at least, two heat exchanger units integrated by a diffuser to feed a cooling medium and a confuser to withdraw the medium to be cooled, primarily, a turbine hot exhaust gas. It also comprises the manifolds feeding and withdrawing the medium being heated, primarily, air, each communicating, via a tube plate, with, at least, one multi-row bank of multipass heat exchange pipes, the various pipes being furnished with bends varying in number from four to six and forming four rectilinear runs combining their three bends. Note here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. The unit of the heat exchange-modular air heater comprises four runs of the heat exchanger pipe multi-row four-pass bank, the said pipes being laid in horizontal rows spaced in horizontal and vertical planes, the manifolds feeding and withdrawing the medium being heated, each being connected, via separate tube plates, with heat exchanger pipes, each tube plate being mounted in the aforesaid manifold walls. Note here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. In compliance with the proposed invention, the aforesaid heat exchanger unit-modular air heater comprises a carcass, a bottom, and upper and lower casing walls, a diffuser to feed the medium to be cooled and a confuser to feed the aforesaid medium, manifolds feeding and withdrawing the medium to be heated and furnished with tube plates that form, in every row, an even number of rectilinear multi-pipe banks including, at least, two inner and two outer banks integrated by constant-radius bends. Note here that the unit housing bottom, cover and one of the side walls represent panels with a reinforcement framing elements forming a flat rod systems, while the unit carcass is formed by a set of the aforesaid flat rod systems with intermediate posts inter jointing the aforesaid systems and the manifolds housings rigidly fixed thereto and, in their turn, attached to the unit bottom and inter jointed via two-ring diaphragms and a pipe medium displacer. Note that the parts of the aforesaid manifolds housings with the aforesaid tube plates and pipe medium displacer fitted therein form, when combined, the unit housing rigid face wall while the side walls allow fastening the diffuser and confuser elements. Note here also that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. In compliance with this invention, the aforesaid heat exchanger unit-modular air heater incorporates a multi-row heat exchanger pipe bank made up of, at least, two bundles of two-pass U-pipes forming, within one bundle, two-run horizontal rows of pipes spaced apart both in rows and between rows, manifolds of feeding and withdrawing the medium being heated and, at least one bypass chamber arranged there between. Note here that the aforesaid manifolds and the bypass chamber communicate with the heat exchanger pipes via a common tube plate or separate tube plates, at least, one part of the said plates forming a part of the aforesaid manifolds enclosure walls. Note also here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs.

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FIELD: heating.

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4 dwg

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2 dwg

FIELD: power engineering.

SUBSTANCE: plant comprises a jacket that passes in longitudinal direction between the head end and the base end, inside which there are inbuilt elements that form a heat-exchange and a mixing structure. Besides, there is coolant medium supply as an internal flow into pipes of inbuilt elements from the base end to the head end and fluid supply as an external flow from the head end to the base end. The plant comprises reinforcement elements to stabilise inbuilt elements in longitudinal direction from pressure gradients developed by fluid, besides, in the main area they are joined with reinforcement elements into a partial structure, which is not exposed to thermal expansion, and in the side area they remain at least partially non-reinforced to form a partial structure capable of thermal expansion in longitudinal direction.

EFFECT: increased efficiency of heat exchange, improvement of the plant.

14 cl, 4 dwg

FIELD: power engineering.

SUBSTANCE: heat exchanger-reactor comprises a vessel in the form of a truncated cone, with a surface concave towards its vertical axis with bottoms, nozzle for coolant inlet and outlet from tube and shell spaces. Inside the vessel 1 there is a tube bundle arranged, comprising at least two rows of cone-shaped pipes fixed with ends in holes of plates along concentric circumferences. Tubes are installed with an inclination simultaneously in two directions: with an inclination to a vertical axis of the vessel and with an additional inclination arranged by displacement of ends in a circumferential direction, i.e. along arcs of circumferences of their installation in tube plates. At the same time inclination angles are arranged within the limits of 0.5-50.0 degrees from the vertical plane stretching via the vertical axis of the vessel.

EFFECT: no necessity to increase input parameters of a coolant, which helps to save thermal and electric power.

5 cl, 4 dwg

FIELD: heating.

SUBSTANCE: in the heat exchanging device the finned heat exchanging tube with the diameter d is made serpentine-shaped with an outer finning diameter D and the thickness of the fins L1, located at a distance L2 from each other. The amplitude of the serpentine A on the outer finning diameter is not less than A=D×(2+1L1+L2L11), the wave period of the serpentine P is not less than P=2D×(1+1L1+L2L11).

EFFECT: intensification of heat exchanging due to turbulence in the flow passing inside the finned serpentine-shaped tubes, and increase in the area of heat exchanging of the device.

23 cl, 8 dwg, 2 tbl

FIELD: heating.

SUBSTANCE: heat exchange device includes elements in the form of spirally wound pipes with alternating straight and ring-shaped sections located opposite each other. The elements are installed in each other with ring-shaped sections. The straight sections of adjacent elements in the heat exchange device are located on one side, and the ring-shaped sections are located on the other side; with that, the elements in the cross section of the heat exchange device are located about its axis in a circumferential direction, with orientation of the ring-shaped sections to the above said axis. The straight sections in the elements can be located in different planes at an angle to each other. In this case, rings of the ring-shaped sections have different diameters, which are maximum in the middle of the elements and minimum in its end sections. At alignment of direction of windings of the adjacent elements, the planes that adjoin the outer side of the ring-shaped sections intersect the axis of the heat exchange device at an acute angle. At mutually opposite direction of the windings of the adjacent elements, the above planes and the axis are parallel.

EFFECT: reduction of overall dimensions of the heat exchange device due to a sealed layout of adjacent elements in it; possibility of arranging it in cylindrical, annular, toroid-shaped and spherical cavities.

4 cl, 14 dwg

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