Condensation heat exchanger with a double bundle of tubes

FIELD: the invention is assigned for heating liquid and may be used for heating or/and sanitary usage.

SUBSTANCE: the heat exchanger is connected with a cylinder furnace having two parallel heat-exchanging elements. Each of these heat-exchanging elements consists of a tube or a group of tubes forming a spiral bobbin in which the wall of the tube (tubes) is manufactured out of material with good thermal conductivity and has a flattened and oval transversal section with the main axis perpendicular or approximately perpendicular to the axis of the spiral. The width on the interval separating the two adjusting turns is constant and smaller than the thickness of the transversal section. The heat-exchanging elements are firmly installed inside the gas- proof shell. The shell encircles two heat-exchanging elements of tubes, located at a distance from each of them. The heat exchanger is fulfilled so that hot gases producing in the furnace pass radially or approximately radially at first through the heat-exchanging element and than through the secondary heat-exchanging element. The diameter of the furnace is smaller then the diameter of the primary heat-exchanging element, The furnace is installed coaxially inside the primary heat-exchanging element. The length of the secondary heat-exchanging element is less then the length of the primary heat-exchanging element for forming free space opposite the end section of the primary heat-exchanging element in continuation of more short the secondary heat-exchanging element. A chamber connected with the inner space of the secondary heat-exchanging element is located in the space.

EFFECT: increases compactness of the heat-exchanger and reduces its weight.

15 cl, 10 dwg

 

The present heat exchanger, in particular, is designed to equip gas boilers for home use, to supply water for Central heating and/or sanitary use.

The object of the present invention, a heat exchanger, more precisely, is a dual heat exchanger, consisting of a primary heat exchanger, which is directly exposed to hot gases produced by the gas furnace and the secondary heat exchanger, which is influenced by gas much lower temperature, which are produced from the primary heat exchanger.

Water, or any other heated fluid circulates in the dual heat exchanger, prototechno evaporation, that is, passing first through the secondary heat exchanger where it is pre-heated, then in the primary heat exchanger, where it is subjected to the final heat.

Exhaust gases coming directly out of the furnace, have a temperature of approximately 1000°C.

After passing through the primary heat exchanger, its temperature mainly varies from 100 to 180°C.

Hot gases contain a certain amount of water vapor that can condense when it comes in contact with the wall of the secondary heat exchanger, although it is below the dew point, about 60°is.

This condensation provides extra calories water circulating in the secondary heat exchanger, these calories correspond to the latent heat of vaporization.

Dual heat exchanger of this type is described for example in document EP 0078207, can significantly improve the efficiency of the device.

In document WO 94/16272 elements described heat exchanger, which consists of a tube made of material with good thermal conductivity, which must circulate chilled fluid, such as water for heating.

Pipe wound in a spiral and has a flattened oval cross-section with a major axis essentially perpendicular to the helical axis, and each revolution of the pipe has a flat surface that is separated from the surfaces of the adjacent coil by a gap of constant height, this height being less than the thickness of the cross section, the distance between two adjacent coils moreover set by means of transverse elements, which consist of bosses formed in the wall of the pipe.

This document also describes the heat exchangers having multiple elements, such as described above, are formed in different ways in the various described embodiments.

Item heat exchanger, designed, provides a very large exchanger is between Yong hot gases, surrounding the tubular element, and the heated fluid circulating inside it.

In fact, during passage through the gap between the coils, the flow of hot gases in contact with a relatively broad surface of the heat exchanger element.

The present invention is the creation of a condensing heat exchanger of the conventional type described above, containing heat exchange elements of the flat tubes, such as in WO 94/16272, which you can access if necessary.

The prior art, which is the closest analog of the present invention corresponds to the variant shown in Fig the above document.

This apparatus consists of two parallel heat exchangers, primary denoted by reference number 1, and the secondary denoted by reference number 1'.

These elements are near each other, their axes are parallel, and they are firmly installed inside the shell 8 (named in the document as "case"),

Hot gases produced by the external device 9 and penetrate through the channel 90 and the sleeve 80 in the Central area of the main heat exchanger 1 (arrow J0). Hot gases pass through it radially from the inner part in the outer (arrow J1), then go through the secondary deploom the ceni, always radial, but this time from the outer part to the inside (arrow J2).

In conclusion, the cooled gases leave the dual heat exchanger through the cuff 81 (arrow J3).

The objective of the invention is the improvement of the heat exchanger is schematically shown in Fig WO 94/16272 to improve its compactness.

In fact, the problem places frequently installers in heat exchangers of this type, refers to the space in which they are placed, which is often small.

The objective of the invention is a relatively easy exchanger, to ensure the operations performed by the installer on transportation, location and mounting the location is more convenient.

The invention is based on the observations, namely, that the energy recovered in the secondary heat exchanger is always less than the energy consumed in the primary heat exchanger.

Based on these observations, we can calculate that the heat exchange surface in the secondary heat exchanger, which is proportional to the length of the heat exchange element can be reduced with respect to the primary heat exchanger.

Thus, if the axial dimension of the secondary element is reduced, at one of its ends is formed a free space, and it can the be used for the outlet of the cuff to waste, the cooled gases.

The scope of this cuff in the axial direction so it does not add to its own volume of heat exchanger, in contrast to the known variant on Fig WO 94/16272, it fits within the volume of the heat exchanger.

Moreover, the length of the secondary heat transfer element is reduced, the heat exchanger is of course easier than the heat exchanger, in which the primary and secondary elements have the same length, as in the above-mentioned heat exchangers.

The present invention therefore is the creation of a condensing heat exchanger connected with a gas or recoverykey furnace, comprising two parallel pipes, one called "primary"and the other, referred to as "secondary", each of these two heat exchangers consists of a tube or group of tubes arranged one after the other, forming a spiral coil, in which the wall of the pipe (pipe) is made from a material with good thermal conductivity and has a flattened oval cross-section with a major axis perpendicular or approximately perpendicular to the helical axis, while the width of the gap separating two adjacent round, constant and much smaller than the thickness of the cross section, thus these two heat exchange element is firmly installed inside the shell, which is the fast gas-tight, and communicated with each other through a manifold, called "transitional", means to circulate liquid to be heated, in particular water, first inside the pipe (pipes)constituting the secondary heat exchanger element, then transition through the collector to the inner part of the tube (pipe), the components of the primary heat exchanger element and the shell surrounds the two heat pipes, placed at a distance from each of them and has the outlet sleeve for exhaust gases, located near the secondary heat transfer element. Heat exchanger so that the hot gases produced by the furnace are radially or approximately radially, passing through the gaps separating the coils of the first through the primary heat exchanger element and then through the secondary heat exchanger element, and then discharged from the heat exchanger through the cuff. When this furnace is a cylindrical furnace, the diameter of which is less than the diameter of the primary heat exchange element, and installed coaxially inside the latter, passing through the axis along its length, the length of the secondary heat transfer element is less than the length of the primary heat exchange element for the formation of a free space opposite end of the primary heat exchange element in the continuation of shorter secondary is Teploobmennik element. And in space posted by Luggage, which communicates with the internal space of the secondary heat exchange element, a sleeve connected with the wall of the chamber to communicate with her, and oriented transversely relative to the axis of the secondary heat transfer element to its volume matches the volume of the chamber.

Each of the tubes constituting each of the heat exchangers has a straight end sections, the axes of these two end sections are located in one plane, tangent to the spiral formed by the heat exchange element, their openings turned toward the outer side of the heat exchanger on each side of the latter, the ends of the primary heat exchange element located near the secondary heat exchange element, and Vice versa, the end sections having a cylindrical hole passing uplatnena through the wall of the shell and extending from the side of the latter in fenced collector, referred to as "intake-exhaust", connected to the supply channel for the liquid to be heated, and the idler channel for fluid to be heated, and to the idler channel for heated liquid, and the other side facing in the transition collector.

The shell contains, on the one hand, a segment of a tube of constant cross-section, an oval contour of this cross is ecene consists of two end sections of the semi-cylindrical shape, United straight side segments, and on the other hand, a pair of closing plates or "facades", the contours of which correspond to the contours of the cross-section and are perpendicular to the axis of the pipe segment, each of which blocks one of the two holes, each semi-cylindrical section of the pipe segment coaxial and partially surrounds one of the heat exchange elements.

One of the facades, named "front facade", has a hole designed to accommodate doors, supporting the furnace, at the same time ensuring its removal.

The door also supports, with its outer side, fan, or cuff, supplying the furnace combustible gas mixture.

Each of the two facades are equipped with thermal insulation disk opposite the inner space of the primary heat exchange element.

Preferably, two of the heat transfer element have the same diameters. The axis of the two heat exchanger elements are horizontal and parallel.

With two heat exchanging element are arranged one above the other, their axes are in the same vertical plane.

Preferably, the secondary heat exchanger element is located above the primary heat exchange element, means such as inclined chute disposed between the two heat exchange elements made for before the prevent high levels of radionuclides fall condensates, which are formed on the secondary heat exchange element on the primary heat exchanger element or a furnace.

Two of the heat transfer element can be located on the side of each other, their axes may be located in the same horizontal plane.

The axis of the idler cuff is located in a plane containing the axis of the two heat exchanger elements.

The axis of the idler cuff perpendicular to the plane containing the axes of the two heat exchanger elements.

Preferably, the wall of the chamber is a cylindrical pipe piece, coaxial with the secondary heat exchange element, one end edge of which is attached to the facade of the heat exchanger, while its other end edge provided with an annular flange, which supports the secondary heat exchanger element, and where the cuff, also of cylindrical shape, is attached to a segment of pipe (9) perpendicular to its axis.

The shell of the heat exchanger has an inclined bottom provided with a lateral connection, suitable for collecting and draining of condensates, which are formed on the secondary heat exchange element.

Other features and advantages of the invention will become more clear from the description and accompanying drawings, which represent possible embodiments of the invention, only as non-limiting examples.

- Figure 1 is a schematic front view is, I can pay tithing variant of the invention, cut along the vertical plane indicated at 1-1 in figure 2.

- Figure 2 is a schematic left side view of the apparatus in figure 1.

- 3 and 4 are simplified views, on a smaller scale, Figure 1 and 2 respectively, these kinds of are designed to show the work, and in particular the path of the gases.

Figure 5-8 - types, similar to Figure 1-4, respectively, showing a second variant embodiment of the invention.

Figures 9 and 10 is a diagram representing an alternative apparatus, respectively visible from the side and front section.

The heat exchanger shown in figure 1-4 contains thin-walled hollow body or shell, designated 1, for example, from stainless steel sheet.

As you can see in figure 2, which is a side view, the housing 1 has an oval shape, the contour of which is formed of upper and lower semi-circular sections which are connected by two lateral straight line segments.

The shell consists of a pipe section 14, which has an oval shape, upper and lower semi-circular sections, indicated by the links 142, 143 in figure 2, while the flat side areas designated 140 and 141, this section of pipe is closed at both ends by caps or "facades" of the same profile, designated 15A and 15b in figure 1.

Hereinafter in this description, "front facade" means the facade 15A on the left in figure 1, and the rear fašade opposite the Assad 15b.

Two facade 15A and 15b fixed, gas tight sealed relation to the Central tubular section 14 by any suitable means such as welding.

As you can see in figure 1, the bottom 16 of the shell is inclined in the direction of the outlet 17, the purpose of which will be explained later.

Inside the shell 1 has two heat exchanging element of spljusnutyj tubes of the type described in the aforementioned international application, each of these elements is a heat exchanger element of the primary heat exchanger 20 and the secondary heat exchanger 30.

Primary heat exchanger element denoted by reference number 21, while the secondary heat exchanger element denoted by reference number 31.

Each of these two heat exchangers consists of a series of adjacent, coaxial tubular elements with a horizontal axis X1X'1for the primary heat exchanger 20 and X2X'2for the secondary heat exchanger 30.

The two horizontal axes are in the same vertical plane indicated by V in figure 2, the secondary heat exchange element 31 is vertically above the primary heat exchange element 21.

The internal space of the heat exchange elements 21 and 31 are marked 2 and 3 respectively.

Gas or recoverya furnace 40 is connected with the primary heat exchanger 20. This trobc the Tay cylindrical furnace, which has along its entire length the many small openings directed radially, ensuring the passage of the combustible gas mixture, e.g. air+butane or air+fuel, the outer surface of the tubular wall is the surface of burning.

In the shown example, the combustible gas mixture is introduced into the apparatus by the fan of a known type, which also forms part of the heat exchanger.

However, the replacement sleeve feed mixture separate means (of known type) for this fan will not go beyond the scope of the invention. Fan, therefore, is separated from the axis X1X'1the main heat exchanger.

Furnace 40 has a significantly smaller diameter than the primary heat exchanger element 21 within which it is coaxially installed, that is, along the axis X1X'1.

Front facade 15A has a round hole 150 centered on the axis X1X'1providing input and installation of the furnace in place inside the shell.

Mounting plate 41 is placed at the outlet of the fan 4 and provides the mounting Assembly to the front facade, for example, by means of bolts (not shown).

This design allows easy disassembly of the furnace, in particular, to make it clear, for the maintenance and repair of the heat exchanger.

On the contrary space of 2 each of the facades 15A and 15b of uti covered with insulating disk 5, 6, for example, of a material on a ceramic base.

These elements are intended to protect at this level the walls of the shell 1 from the intense heat produced in the combustion process.

The discs 5, 6 are mounted on the walls 15A and 15b suitable known means.

The disk 5 has in its Central part a hole identical to the hole 150, to ensure the passage of the furnace.

It should be noted (see Figure 1)that the disk 6 is not attached directly to the rear facade 15b. On the contrary, it is held at a distance from the latter using spacers 61.

The secondary heat exchange element 31 consists of a certain number of helical tubular elements which are identical to those that constitute the primary heat exchanger element 21.

For indicators that each element consists of a tube flattened, oval cross section, stranded in four orbits. Formed coil has an inner diameter of 185 mm, the external diameter of 235 mm; the thickness of the tapered section of the pipe is equal to 7.2 mm, and the gap between the two coils, is 0.8 mm.

Each element thus has an axial dimension 32 mm

In the shown example, the primary heat exchange element 21 consists of a connection of ten elements.

In accordance with the principal feature of the invention, the number of items sostav the participating secondary heat exchanger element 31, less. In the example shown there are six (instead of ten).

Length l1the primary heat exchange element 21 thus is 320 mm (h), while the length l2the secondary heat exchange element 31 is equal to only 192 mm (h), the difference is 128 mm

In the embodiment of the invention figure 1-4 secondary heat exchanger element 31 one of its ends adjacent to the front facade 15A.

Due to the difference between the lengths l1-l2free space thus formed between the other end of the secondary heat exchange element 31 and the rear fašade 15b.

In this space the camera is installed, consisting of a cylindrical sleeve 9, having its center on the axis of X2X'2which is attached to one of its end edges to the rear facade 15b, for example, by welding. The other end has an annular flat flange 90, which is perpendicular to the axis X2X'2.

This flange functions as the support at the other end of the secondary heat exchange element 31. The heat exchanger contains the cuff 7 to exhaust cooled gases.

A cylindrical tubular sleeve is also provided, it has a vertical axis ZZ' and attached to the sleeve 9, to which it is attached and with the inner surface of which it is reported.

The sleeve 7 is intended for the of prisoedinenia to the idler channel for exhaust gases and fumes, for example, to a chimney (not shown).

In the shown embodiments of the invention, the elements comprising each of the primary heat exchange element 21 and the secondary heat exchange element 31, are connected in parallel.

However, providing a consistent set of some or all of the elements for each pipe not to be beyond the scope of this invention.

The ends of each element have the same shape and orientation, as shown in figure 1 and 24 of the above international application.

Each end of the coil is a pipe with a cylindrical plot holes, moving the hole to the rest of the pipe is tapered cross-section is provided gradually (in the form of "whistle").

The axes of these two ends (directed outward) lie in the same plane, tangent to the helical coil.

This plane is horizontal.

Terminal sections 210 and 211 of the elements of the primary (lower) heat exchanger element, located on the upwards direction, while, on the contrary, the ends 310, 311 secondary heat exchange element (upper) 31 are along the bottom.

This reverse arrangement is made in such a way that the outlet of one of the elements located near the outlet openings of the other element,and Vice versa.

Each twisted tubular element placed inside the shell by engagement of one of its cylindrical sections of the holes with suitable circular holes formed on the vertical flat side walls 140, 141 of the shell.

Suitable sealing means is formed in this area.

Additional elements (not shown) can preferably be equipped for proper installation and alignment of each element inside the shell.

Moreover, it should be noted that each of the flat tubes forming the coil has at one of its widest surfaces a number of bosses (zashtampovanny in her flat wall), acting as separators, designed to accurately set the gap size between the two coils, in accordance with the device described in the application WO 94/16272.

Boss related to heat transfer elements 21 and 31, respectively denoted by reference numbers 212 and 312.

The ends of each of the coils constituting the coil, facing the reservoir, mounted on the outside of the wall of the shell 1, and more precisely on the flat sections 140, 141, in order to completely surround the hole receiving the ends of the coils.

On the surface 140 is fixed collector, called "intake and exhaust"denoted by reference but who am 100, while on the opposite surface 141 is fixed to the manifold 11, called "transitional".

In both cases, they are elongated section having the shape of a rectangular parallelepiped with the necessary holes. They are fastened to the shell 1, for example, by bolts indicated by the reference number 101 in figure 2, or directly by welding. In this place naturally compacted.

The collector 100 inside is divided by a horizontal wall 13.

The plot of the collector 100, located on the top wall 13 has a connecting tube 12, which is intended for connection to the supply channel for cold water, which should be heated; moreover, this area is attached to the collection of input ends of the secondary heat exchange element 31.

On the contrary, the lower portion of the reservoir 100, which corresponds to the space beneath the wall 13 has a tube 10 for connection to the output channel for hot water; this part is attached to the collection of output ends of the elements of the primary heat exchanger element 21.

Opposite the manifold 11 has no walls. This provides a link between the output ends of the secondary heat exchange element 31 and the input end of the primary heat exchange element 21.

Inside the shell between the two heat exchangers installed trough 8, CR the can be attached to the front facade 15A. This plate is slightly curved, with the concave surface directed upwards and inclined downwards and towards the rear (see Figure 1).

As you can see in Fig, trough occupies only the Central zone of the shell, but does not prevent the passage of exhaust gases around, as we will see next.

Free the rear end of the plate 8 is bent down, the most inclined edge 80, which hangs over the space mentioned above, separates the insulating disc 6 from the rear facade 15b (see Fig 1).

To ensure installation of the device area 14 of the shell 1 consists of two halves of the body, which can be assembled together, for example, by welding, along the connecting plane corresponding to the vertical plane V.

This provides adjustment of the two halves of the body into two beams, pre appropriately located relative to each other.

Before the final Assembly of the insulating ring disk 5 and the groove 8 are attached to the inner surface of the front facade 15A. Insulating disk 6 as well as the sleeve 9 with his cuff 7 (to which it is pre-attached), are attached to the inner surface of the other of the facade 15b.

In the upper part of both housing halves forming section 14 of the shell, have a semicircular holes that surrounds this cuff 7, when they are connected one with the other, the facade 15b must be conveniently located. Then, after the facade 15A was set in place, welding or Assembly around the circumference of the cuff 7 at the level of the shell 14, inclusive, for the implementation of the seal in this area.

Eventually, furnace respectively provided with suitable ignition device, such as an electrode located near the surface of the combustion. Referring to the known device, which was not shown in the drawings to avoid unnecessary complications.

Now will be described the operation of this heat exchanger with reference to Figure 3 and 4.

The fan 4, set in motion, sends a combustible gas mixture inside a tubular furnace 40. This mixture exits the wall of the furnace through the small holes passing through the wall. When the furnace is lit, the fire is burning and produces a flame F over the entire surface of the furnace.

At the same time, the water to be heated circulates.

Cold water, EF figure 4, enters the heat exchanger through the pipe 12, is distributed in the upper part of the reservoir 100 and penetrates into the input ends of the upper heat exchange element 31. She leaves last through the weekend ends, passes into the reservoir 11, where it goes, as indicated by the arrow T, to enter into the input ends of the lower heat exchange element 21, and circulates in it. In C the conclusion is, the heated water exits through the output end of this element, is held in the lower part of the reservoir 100 and exits through the tube 10, as shown by the arrow EU.

The exhaust gases formed in the space of 2 flame F, are moved towards the outer part of the primary heat exchange element 21. They pass radially through the gaps separating the flat tubes, components, ensuring high-temperature heat exchange, and thus highly heated water passing through the inner surface and pre-heated (as will be seen later) during its passage through the secondary heat exchanger 31.

Leaving the primary heat exchanger element, the exhaust gases is significantly cooled by this heat exchange. However, their temperature is definitely higher than the temperature (at ambient temperature), which is included in the heat exchanger.

As indicators of their temperature ranges from 100 to 150°C.

These hot gases pass upward along the inner wall of the shell. They are on the sides of the trough 8 and pass through the secondary heat exchanger element 31, this time from the outside to the inside, passing through the coils of flattened tubes. During this passage occurs at least partial condensation of the water vapor present in the exhaust is the basics, as the walls of the secondary heat transfer element, through which cold or just warm water, have a temperature lower than the dew point of the combustion products. In addition to the normal transition of calories due to the temperature difference between exhaust gases and the water circulating in the secondary heat exchange element provides additional transition calories as a result of transfer of latent heat of vaporization associated with the phenomenon of condensation, change exothermic phase.

Thus preheating the water circulating in the secondary beam before it reaches the primary beam.

Exhaust gases, notably cooled, pass into the space 3 within the secondary heat exchanger, then out through the chamber 9 in the outlet channel 7.

Liquid condensates coming from the tubes of the secondary heat exchange element 31, under the influence of gravity fall into the groove 8, so that they do not interfere with the furnace. The inclination of the chute they are sent to the back end, get on the bent down edge 80 and falling behind the insulation plate 6 on the inclined bottom 16 of the shell. Passing along this inclined bottom, they reach the hole for condensate 17, which is connected with a suitable lateral channel (not shown).

The second variant of the invention, which dormancy is Zan figure 5-7, exactly the same just described. For this reason, the same reference numbers have been used to designate similar or identical elements.

The basis is the same organization as in the first embodiment, with the following two exceptions.

First, the heat exchanger has a generally horizontal, not vertical, position. In fact, two of the heat exchange element arranged side by side and not one above the other, and their axes X1X'1and X2X'2lie in the same horizontal plane N.

In the shown example, the transition manifold 11 is located on the top, while the intake-exhaust manifold 100 is located at the bottom (see Fig.6).

Of course, the opposite is also possible location.

Bypass sleeve for exhaust gases remains upward.

Secondly, (vertical) axis YY' of this cuff 7 is perpendicular to the plane containing the axes of the two heat exchanger elements (and no longer contained in this plane).

In this embodiment there is no need to apply a gutter for collecting condensates, as the secondary heat transfer element on which they are formed is positioned to the side and is no longer located directly under the primary heat exchange element and the furnace. The bottom shell 16 is tilted, and the condensate falls directly to the bottom for removal through the outlet connection is out 17.

7 and 8 shows the circulation of gases in the heat exchanger. It is identical to the first variant of the invention, except that the flow of exhaust gases leaving the primary heat exchanger element, to achieve the secondary heat transfer element is positioned horizontally, and not vertically, inside the shell.

In each of the two variants that have been described, the tubular elements comprising both primary and secondary heat exchange elements are identical. It is not necessary that the coil may vary, in particular in diameter.

Moreover, the space that hosts the camera 9 and the sleeve 7, is located between the secondary heat transfer element and the rear facade.

Such an arrangement is not necessarily as shown in the alternative in figures 9 and 10.

These drawings are used the same reference numbers as in the preceding embodiments for similar, but not identical items, although the indication is added to the bar.

Thus, in these drawings it will be seen that the diameter of the primary heat exchange element 21' is greater than the diameter of the secondary heat exchange element 31'.

Here a modified form of sheath surrounding the two elements. Side surfaces 140' and 141' are no longer parallel, but inclined to slightly converge at the top.

The shell 9' and the sleeve 7' are m is waiting for the front facade 15 A and secondary heat exchange element 31'.

Of course, beyond the scope of the invention will not leave provision of the mixed device of the one or the other of the first two options represent alternative figures 9 and 10, consisting of:

- installation in the heat exchanger of the first or second primary and secondary heat exchangers of different diameters (without moving the boom and arm),

or move the cuff in position, as in Figure 10, (at the same time, the diameters are the same for both elements).

The heat exchanger in accordance with the invention is very compact and lightweight at the same time very effective against efficiency.

Despite significant good suitability for home use for heating water, it may find application in other areas, in particular in industry for heating various liquids.

1. The condensing heat exchanger, which is connected with a gas or recoverykey furnace (40), comprising two parallel heat exchange element one (21), referred to as "primary"and the other (31), referred to as "secondary", each of these two heat exchangers consists of a tube or group of tubes arranged one after the other, forming a spiral coil, in which the wall of the pipe (pipe) is made from a material with good thermal conductivity and has a tapered and oval cross-Sich is compared with the main axis, perpendicular or approximately perpendicular to the helical axis, while the width of the gap separating two adjacent coils, permanent and significantly less than the thickness of the cross section, thus these two heat exchange element is firmly mounted inside the shell (1), which is gas-tight, and communicated with each other through the collector (11), called "transitional", means to circulate liquid to be heated, in particular water, first inside the pipe (pipes)constituting the secondary heat exchanger element (31), then transition through the manifold 11) to the inner part of the tube (pipe), the components of the primary heat exchanger element (21), and shell (1) surrounding two heat pipes, placed at a distance from each of them and has the discharge cuff (7) for the exhaust gases, located near the secondary heat exchange element (31)and the heat exchanger so that the hot gases produced by the furnace (40), are radially or approximately radially, passing through the gaps separating the coils of the first through the primary heat exchanger element (21) and then through the secondary heat exchanger element (31), and then discharged from the heat exchanger through the cuff (7), characterized in that the insert (40) is cylindrical combustion chamber, the diameter of which is less than the diameter of p is vicinage of the heat transfer element (21), and installed coaxially inside the latter, passing through the axis along its length, the length (l2secondary heat exchange element (31) is smaller than the length (l1) primary heat transfer element (21)to form a free space opposite end of the primary heat exchange element in the continuation of shorter secondary heat exchange element, and in space posted by Luggage (9), which communicates with the internal space (3) secondary heat exchange element, a sleeve (7) is connected to the wall of the chamber (9) in order to communicate with her, and oriented transversely relative to the axis (X2X'2secondary heat exchange element (31), so that its volume matches the volume of the chamber (9).

2. The heat exchanger according to claim 1, characterized in that each of the tubes constituting each of the heat exchangers (21, 31)has a straight end sections (210-211, 310-311), the axes of these two end sections are located in one plane, tangent to the spiral formed by the heat exchange element, their openings turned toward the outer side of the heat exchanger on each side of the latter, the ends of the primary heat exchange element located near the secondary heat exchange element, and Vice versa, the end sections having cylindrical apertures about adamie uplatnena through the wall of the shell (1), and facing the side of the latter within the manifold (100), referred to as "intake-exhaust", connected to the supply channel for the liquid to be heated, and to the idler channel for heated liquid, and the other side facing in the transition manifold (11).

3. The heat exchanger according to claim 1 or 2, characterized in that the shell (1) contains, on the one hand, the pipe section (14) of constant cross-section, an oval contour of this cross-section consists of two end sections of the semi-cylindrical shape, connected by straight side segments, and on the other hand, a pair of closing plates or "facades" (15A, 15b), the contours of which correspond to the contours of the cross-section and are perpendicular to the axis of the pipe segment, each of which blocks one of the two holes, each semi-cylindrical section (142, 143) of the pipe segment (14) coaxial and partially surrounds one of the heat exchangers (21, 31).

4. The heat exchanger according to claim 3, characterized in that one of the facades (15A), named "front facade", has a hole (150)designed to accommodate the door (41)supporting the furnace (40), at the same time ensuring its removal.

5. The heat exchanger according to claim 4, characterized in that the door (41) also supports its outer side fan (4), or cuff, supplying the furnace combustible gas with which ESU.

6. The heat exchanger according to claim 3, characterized in that each of the two facades (15A, 15b) provided with a thermal insulating disk (5, 6), opposite the interior space (2) primary heat transfer element (21).

7. The heat exchanger according to claim 1, characterized in that two heat exchange element have the same diameters.

8. The heat exchanger according to claim 1, characterized in that the axis (X1X'1, X2X'2two heat exchangers (21, 31) horizontal and parallel.

9. The heat exchanger of claim 8, wherein the two heat exchange element (21, 31) are arranged one above the other, their axes (X1X'1, X2X'2) are in the same vertical plane (V).

10. The heat exchanger according to claim 9, characterized in that the secondary heat exchanger element (31) is located above the primary heat transfer element (21), means such as inclined chute (8)placed between two heat exchange elements made to prevent the fall of the condensates, which are formed on the secondary heat exchange element (31)on the primary heat exchanger element (21) or the furnace (40).

11. The heat exchanger of claim 8, wherein the two heat exchange element (21, 31) are located laterally from each other, their axes (X1X'1, X2X'2) are in the same horizontal plane (H).

12. The heat exchanger according to claim 1, characterized in that the OS is (ZZ') idler cuff (7) is located in the plane containing the axis (X1X'1, X2X'2two heat exchanger elements.

13. The heat exchanger according to claim 1, characterized in that the axis (YY') idler cuff (7) is perpendicular to the plane containing the axis (X1X'1, X2X'2two heat exchanger elements.

14. The heat exchanger according to claim 1, characterized in that the wall of the chamber (9) is cylindrical pipe piece, coaxial with the secondary heat exchange element (31), one of the end edges of which are attached to the facade (15b) of the heat exchanger, while its other end edge provided with an annular flange (90), which supports the secondary heat exchanger element (31), and where the sleeve (7), also of cylindrical shape, is attached to a segment of pipe (9), perpendicular to its axis (X2X'2).

15. The heat exchanger according to claim 1, characterized in that the shell (1) has a sloping bottom (16), provided with a lateral connection (17), suitable for collecting and draining of condensates, which are formed on the secondary heat exchange element (31).



 

Same patents:

FIELD: the invention is assigned for heat exchanging and may be used for heating and hot water supply.

SUBSTANCE: the condensation heat exchanger is fulfilled with a burner and has at least one tubular element consisting of one tube or of the group of tubes located from one end to another end forming a spiral winding, moreover the wall of the tube or of the tubes is manufactured of material of high thermal conductivity and has a flattened oval transversal section whose large axis is perpendicular or approximately perpendicular to the axis (X-X') of the spiral winding. The width of the gap separating two neighboring turns is constant and less then the thickness of the transversal section. The tubular element is installed motionlessly inside the gas-proof body. In the heat exchanger hot gases pass in radial or approximately radial direction through the tubular element. The body is fulfilled of thermal resistant plastic and has means for mechanical fixation of the tubular element in its main axial sector, moreover the means are fulfilled with possibility of amortization of axial efforts, caused with inner pressure of circulating in it liquid urging to deform its walls preventing transfer of these loads on the body.

EFFECT: reduces weight and cost price of the arrangement.

19 cl, 16 dwg

FIELD: the invention is assigned for heat exchanging and may be used for heating and hot water supply.

SUBSTANCE: the condensation heat exchanger is fulfilled with a burner and has at least one tubular element consisting of one tube or of the group of tubes located from one end to another end forming a spiral winding, moreover the wall of the tube or of the tubes is manufactured of material of high thermal conductivity and has a flattened oval transversal section whose large axis is perpendicular or approximately perpendicular to the axis (X-X') of the spiral winding. The width of the gap separating two neighboring turns is constant and less then the thickness of the transversal section. The tubular element is installed motionlessly inside the gas-proof body. In the heat exchanger hot gases pass in radial or approximately radial direction through the tubular element. The body is fulfilled of thermal resistant plastic and has means for mechanical fixation of the tubular element in its main axial sector, moreover the means are fulfilled with possibility of amortization of axial efforts, caused with inner pressure of circulating in it liquid urging to deform its walls preventing transfer of these loads on the body.

EFFECT: reduces weight and cost price of the arrangement.

19 cl, 16 dwg

FIELD: the invention is assigned for heating liquid and may be used for heating or/and sanitary usage.

SUBSTANCE: the heat exchanger is connected with a cylinder furnace having two parallel heat-exchanging elements. Each of these heat-exchanging elements consists of a tube or a group of tubes forming a spiral bobbin in which the wall of the tube (tubes) is manufactured out of material with good thermal conductivity and has a flattened and oval transversal section with the main axis perpendicular or approximately perpendicular to the axis of the spiral. The width on the interval separating the two adjusting turns is constant and smaller than the thickness of the transversal section. The heat-exchanging elements are firmly installed inside the gas- proof shell. The shell encircles two heat-exchanging elements of tubes, located at a distance from each of them. The heat exchanger is fulfilled so that hot gases producing in the furnace pass radially or approximately radially at first through the heat-exchanging element and than through the secondary heat-exchanging element. The diameter of the furnace is smaller then the diameter of the primary heat-exchanging element, The furnace is installed coaxially inside the primary heat-exchanging element. The length of the secondary heat-exchanging element is less then the length of the primary heat-exchanging element for forming free space opposite the end section of the primary heat-exchanging element in continuation of more short the secondary heat-exchanging element. A chamber connected with the inner space of the secondary heat-exchanging element is located in the space.

EFFECT: increases compactness of the heat-exchanger and reduces its weight.

15 cl, 10 dwg

FIELD: power engineering.

SUBSTANCE: in a boiler comprising a water inlet pipeline and a water outlet pipeline, between which a heat exchanger is arranged, comprising a helical channel, through which heated water goes, the heat exchanger provides formation of a separate combustion chamber with a burner installed in it, where gas-air mixture is supplied. Besides, the upper cover is arranged to be in contact with at least one last upper turn of the heat exchanger channel, and the lower cover is arranged at a certain distance from the last lower turn of the heat exchanger channel to create a gap for gas passage and condensate discharge. Besides, the specified heat exchanger comprises a header, which is installed with central arrangement on the upper surface of the specified combustion chamber, has a surface with a concave profile, is arranged above the specified upper cover, and forms a cavity with the upper surface of this cover, inside of which the gas and air mixture is collected before it is sent inside the specified burner.

EFFECT: heat insulation of the burner without application of fire-resistant materials and reduced overall costs for manufacturing.

25 cl, 5 dwg

FIELD: heating.

SUBSTANCE: door with a built-in burner for a heating unit, which is equipped on its inner side with gas burner (2) and on its outer side with system (5) for supply of flammable gas mixture to the burner. Door (1) is made so that it can be installed in frame (61) of the unit wall and detachably fixed on that frame, differs by the fact that it includes a pair of metal sheets (10, 11) rigidly attached to each other in their circumferential direction (100). Outside sheet (10) is provided in its central zone with inlet hole (102) for injection of the above gas mixture, and inside sheet (11) is provided in its central zone with outlet hole (103) that is coaxial to the above inlet hole (102) and on which burner (2) is fixed. Two sheets (10, 11) are located at some distance from each other, and between them there is the space, inside which baffle plate (3, 3') is fixed. The above baffle plate (3) has the shape of a disc, the diameter of which exceeds the diameter of inlet (102) and outlet (103) holes of the above door, and is installed with its centre on axis (X-X') of those holes and perpendicular to that axis. Baffle plate (3) is made of two parallel sheets (30, 31) located at a short distance from each other and attached to each other in their peripheral direction (300). Baffle plate (3) has such shape and dimensions that the gas mixture flow entering the unit through the above inlet hole (102) deviates to the outside of baffle plate (3), envelopes its peripheral shoulder (300) to the inner side and then flows along its inner side and leaves the above outlet hole (103) and enters burner (2).

EFFECT: design restricts heat losses through the door, allows maintaining its outer side in a cold state, preventing burns and burning gas mixture.

18 cl, 7 dwg

FIELD: heating.

SUBSTANCE: invention refers to devices and methods of fuel combustion in heat-generating plants and can be used for heating of gaseous, liquid and suspension process media due to combustion of gaseous or liquid evaporating fuel. The device for fuel combustion and heating of process media includes catalytic material (catalyst) for flameless fuel combustion at direct contact with an oxidiser, an air heater, a heat exchanger for heating of process medium with combustion products, and an induced-draft fan. The device consists at least of two heat exchange sections, for example of a spiral and radial type, which include a catalyst, and each of which has a cylindrical shell, an annular gap adjacent to the shell for the oxidiser injection, an annular fuel header-distributor adjacent to the shell, which is located on outer or inner sides of the shell, a fuel mixture gas duct located coaxially and filled with a head piece, an annular mixing chamber of the oxidiser - with fuel, which is located between the gas duct and the shell, oxidation (combustion) products gas duct adjacent to the shell of the unit, as well as a unit of catalytic heat exchange elements, which is located between the gas duct of fuel mixture and gas duct of oxidation products, which has slit gaps between heat exchange elements for passage of fuel mixture and combustion products, which are filled with a granulated catalyst of fuel oxidation, and closed inner space of heat exchange elements for passage of heated medium; besides, the unit of catalytic heat exchange elements is provided with a branch pipe and a header-distributor for supply of heated process medium, as well as a header and an outlet branch pipe of heated process medium; besides, the device is equipped with a start-up air heating device.

EFFECT: simpler device, lower metal consumption, lower power consumption and larger range of fuels.

2 cl, 3 dwg

FIELD: heating.

SUBSTANCE: group of inventions relates to a device for production of hot fluid media comprising facilities for supply or facilities for production of hot gases and a heat exchanger-condenser. The heat exchanger-condenser comprises a bundle of tubes that performs the function of the primary heat exchanger. This bundle comprises a tube or a group of joined tubes that create a spiral winding. The wall of the tube (tubes) is made of heat conducting material. This bundle is fixed inside a gas impermeable jacket and is equipped with a sleeve for removal of gases. Two reflecting plates and a reflecting ring are made as capable of directing gas circulation through turns of the primary heat exchanger. The specified device comprises the second bundle of tubes that performs the function of the secondary heat exchanger, facilities for separate forced circulation of secondary fluid medium different from the primary fluid medium. Besides, the second reflecting plate is installed between the primary heat exchanger and the secondary heat exchanger.

EFFECT: group of inventions is aimed at creation of a device for production of hot fluid media, comprising a heat exchanger-condenser and characterised by increased total efficiency factor, which may be produced serially, with easily changed packaging arrangements.

19 cl, 5 dwg

FIELD: heating.

SUBSTANCE: method includes multi-stage heating of coolant with oxidation gases, at the same time to each stage some coolant and some fuel are supplied, at the first stage oxidation gases are produced by catalytic oxidation of a gas-fuel mix, produced by mixing of heated air and the first part of fuel, and at each subsequent stage oxidation gases are produced by catalytic oxidation of the gas-fuel mix produced by mixing of oxidation gases of the previous stage and one of remaining parts of fuel. At the same time air is heated due to cooling of oxidation gases of the last stage, which are then released, and process medium is heated due to cooling of a mixture of heated coolant parts. Fuel and coolant supply to each stage is regulated depending on maximum and minimum temperature of catalyst.

EFFECT: invention increases efficiency ratio, reduces energy costs and metal intensity of equipment, and expands assortment of coolants and heated media.

3 cl, 1 dwg

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