CN218626919U - Flue gas heat exchange device for gas boiler - Google Patents

Abstract

The utility model discloses a flue gas heat exchange device for gas boiler, it relates to gas boiler technical field, flue gas heat exchange device includes: the smoke-disturbing type smoke-disturbing fan comprises a plurality of fins arranged in a first direction, wherein each fin is repeatedly bent in a V shape in a second direction, the second direction is vertical to the first direction, and at least one side of each fin is provided with a plurality of protruding parts which play a role in disturbing flow to smoke; a plurality of heat exchange tubes passing through the fins in the first direction; the heat exchange tube with the fin sets up in the casing, the casing has flue gas inlet and exhanst gas outlet, the flue gas inlet with form the flue gas runner between the exhanst gas outlet, the flue gas runner flows through the heat exchange tube with the part of fin is whole to be extended along the third direction, the third direction perpendicular to first direction with the second direction. The heat exchange device can solve the problems of low heat exchange efficiency and energy waste of the existing heat exchange device.

Description

Flue gas heat exchange device for gas boiler

technical field

The utility model relates to the technical field of gas boilers, in particular to a flue gas heat exchange device for gas boilers.

Background technique

At present, the heat loss of gas-fired boilers is mainly the heat loss of exhaust gas, and the temperature of exhaust gas directly reflects the thermal efficiency of the boiler. The exhaust gas temperature of domestic boilers is generally high, and the exhaust gas temperature is above 100°C under full load. It is undoubtedly a waste of energy to directly discharge high-temperature flue gas to the atmosphere. Therefore, most of the finned tube or finned tube flue gas heat exchangers currently used use the method of indirect contact between the flue gas and the heat exchange medium, so as to recover the waste heat of the flue gas.

For example, Chinese patent CN214701863U discloses a finned heat exchanger, including a casing, in which there are heat exchange tubes and fins for heat exchange, the fins are set on the outer wall of the heat exchange tube, and the top position of the inner wall of the casing is There are two horizontal rollers connected, the heat exchange tube and the fins are located between the two rollers, both rollers can rotate around their own axes, the two rollers are wound with dust-proof nets, one end of the dust-proof net It is connected with the roller shaft, and the other end is connected with a fixing device, which is used to fix the dust-proof net. In the above structure, heat exchange gas and heat exchange liquid are exchanged through finned tubes, but this structure only relies on the increased heat exchange area of finned tubes to improve heat exchange efficiency, which fails to destroy the fluid flow boundary layer, making the participating The fluid medium for heat exchange has insufficient heat exchange and low heat exchange efficiency.

Another example is the Chinese patent CN215982881U which discloses a high-efficiency finned heat exchanger for an air-conditioning unit, including a high-efficiency finned heat exchanger frame. The inner side walls of the fixed frames are all fixedly connected with heat exchange tanks, wherein the top of one side of the water exchange tank is sealed with a drain pipe, and the bottom of one side of the other heat exchange tank is sealed with a water inlet pipe. The outer wall of the connecting pipe of the inner heat exchanger is provided with spiral cooling fins to contact the outer wall of the inner heat exchanger. The heat is well transferred to the outside, and the fixed heat conduction and heat exchange fins are arranged equidistantly, which can support the auxiliary water exchange pipe and transfer heat well, further improving the heat dissipation efficiency and heat conduction performance. Similarly, in the above structure, the gas exchanges heat with the heat exchange fins, but the heat exchange boundary layer on the gas side is not destroyed from the perspective of fluid heat transfer, and the heat exchange fluid only exchanges heat with the fins, and the heat exchange efficiency is low.

It can be seen from the above that although the heat exchange between the flue gas and the heat exchange medium is realized in many current scheme structures, the turbulent flow of the flue gas is often unable to be further enhanced in its structure, resulting in incomplete heat exchange and heat exchange. The efficiency is low, causing energy waste to a certain extent.

Utility model content

In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiment of the utility model is to provide a flue gas heat exchange device for a gas-fired boiler, which can solve the problems of low heat exchange efficiency and energy waste problem.

The concrete technical scheme of the utility model embodiment is:

A flue gas heat exchange device for a gas boiler, the flue gas heat exchange device comprising:

A plurality of fins arranged along the first direction, each fin is repeatedly bent in a V shape along the second direction, the second direction is perpendicular to the first direction, at least one of the fins The side has a plurality of protrusions that disrupt the flow of the smoke;

a plurality of heat exchange tubes passing through the fins along the first direction;

A casing, the heat exchange tubes and the fins are arranged in the casing, the casing has a flue gas inlet and a flue gas outlet, and a flue gas is formed between the flue gas inlet and the flue gas outlet The flow channel, the part of the flue gas flow channel flowing through the heat exchange tube and the fins extends along a third direction as a whole, and the third direction is perpendicular to the first direction and the second direction.

Preferably, in the plane formed by the first direction and the second direction, the heat exchange tubes are meandered and bent through the fins, and there are gaps between adjacent rows of the heat exchange tubes, so as to At least part of the flue gas flow channel is formed; the raised portion is located at a gap between adjacent rows of the heat exchange tubes.

Preferably, a plurality of heat exchange tubes are arranged in a row along the third direction; adjacent heat exchange tubes are arranged in a straight row or in a forked row.

Preferably, a plurality of the raised portions are arranged in a row along the third direction.

Preferably, the heat exchange tube passes through the bends of the fins, and the raised portion is located at a plane between adjacent bends of the fins.

Preferably, the raised portion has a preset shape with holes, and the preset shape includes at least one of the following: rectangle, ellipse, and trapezoid.

Preferably, the raised portion is linear and extends along the third direction.

Preferably, the flue gas heat exchange device further includes: a water inlet pipe extending along the third direction and a water outlet pipe extending along the third direction, one end of the plurality of heat exchange pipes is connected to the water inlet pipe The other ends of the plurality of heat exchange tubes are connected to the water outlet pipe, and the water inlet of the water inlet pipe and the water outlet of the water outlet pipe are both facing the direction of flue gas flow.

The technical solution of the utility model has the following significant beneficial effects:

When the flue gas enters from the flue gas inlet, it enters the heat exchanger through the flue gas flow channel between two adjacent fins. As a result, part of the smoke flows through the gap between the adjacent raised parts, and the other part of the smoke flows through the gap between the raised part and the adjacent fins, so that the laminar flow boundary layer of the smoke is destroyed, and the turbulence effect is eliminated. Enhanced, thereby strengthening the convection of the flue gas between the fins, thereby improving the heat exchange efficiency between the flue gas and the heat exchange medium in the heat exchange tube, and the flue gas after heat exchange flows out through the flue gas outlet.

With reference to the following description and accompanying drawings, specific embodiments of the present utility model are disclosed in detail, indicating how the principle of the present utility model can be adopted. It should be understood that the embodiments of the present invention are not limited thereby in scope. Features described and/or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with, or instead of features in other embodiments .

Description of drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help the understanding of the present utility model, and do not specifically limit the shapes and proportional dimensions of the various components of the present utility model. Under the teaching of the utility model, those skilled in the art can choose various possible shapes and proportional dimensions according to specific conditions to implement the utility model.

Fig. 1 is a three-dimensional structural schematic diagram of the flue gas heat exchange device (not including the shell) in the embodiment of the utility model;

Fig. 2 is a side view of the flue gas heat exchange device in Fig. 1;

Fig. 3 is a back view of the flue gas heat exchange device in Fig. 1;

Fig. 4 is a top view of the flue gas heat exchange device in Fig. 1;

Fig. 5 is a front view of the fin in the first embodiment of the utility model;

Fig. 6 is a schematic diagram of the three-dimensional structure of the fin in the first embodiment of the utility model;

Fig. 7 is a left view of the fin in the first embodiment of the utility model;

Fig. 8 is a top view of the fin in the first embodiment of the utility model;

Fig. 9 is a schematic structural view of the fins in the second implementation mode in the embodiment of the present invention;

Fig. 10 is a schematic structural view of the fins in the third implementation mode in the embodiment of the present invention;

Fig. 11 is a schematic structural view of the fins in the fourth embodiment in the embodiment of the present invention;

Fig. 12 is a schematic structural view of the fins in the fifth embodiment in the embodiment of the present invention;

Fig. 13 is a schematic structural view of the fins in the sixth embodiment of the embodiment of the present invention;

Fig. 14 is a schematic structural diagram of the fins in the seventh embodiment of the embodiment of the present invention.

Reference signs of the above drawings:

1. Water inlet pipe; 2. Water outlet pipe; 3. Heat exchange pipe; 4. Fin; 41. Raised part.

Detailed ways

The details of the utility model can be understood more clearly in combination with the accompanying drawings and the description of the specific implementation of the utility model. However, the specific implementations of the utility model described here are only for the purpose of explaining the utility model, and cannot be construed as limiting the utility model in any way. Under the teaching of the present utility model, any possible deformation based on the present utility model can be conceived by a skilled person, and these should be regarded as belonging to the scope of the present utility model. It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted", "connected" and "connected" should be interpreted in a broad sense, for example, it may be a mechanical connection or an electrical connection, or it may be the internal communication of two components, either directly or indirectly through an intermediary, Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to solve the problems of low heat exchange efficiency and energy waste of existing heat exchange devices, a flue gas heat exchange device for gas-fired boilers is proposed in this application. The three-dimensional structure diagram of the exchange device (not including the shell), Fig. 2 is a side view of the flue gas heat exchange device in Fig. 1, Fig. 3 is a back view of the flue gas heat exchange device in Fig. The top view of the air heat exchange device, Fig. 5 is the front view of the fin in the first embodiment of the utility model embodiment, and Fig. 6 is the three-dimensional structure of the fin in the first embodiment of the utility model embodiment Schematic diagram, Fig. 7 is a left view of the fin in the first embodiment of the utility model embodiment, Fig. 8 is a top view of the fin in the first embodiment of the utility model embodiment, Fig. 9 is the utility model embodiment The structure diagram of the fin in the second embodiment of the new embodiment, Figure 10 is the structure diagram of the fin in the embodiment of the utility model in the third embodiment, and Figure 11 is the fin in the embodiment of the utility model Schematic diagram of the structure under the fourth embodiment, Fig. 12 is a schematic structural diagram of the fins in the fifth embodiment of the utility model embodiment, Fig. 13 is a sixth embodiment of the fins in the embodiment of the present utility model Fig. 14 is a schematic structural diagram of the seventh embodiment of the fins in the embodiment of the present invention. As shown in Fig. 1 to Fig. 14, the flue gas heat exchange device may include: a plurality of fins along the first direction The fins 4 arranged in a row, each fin 4 is repeatedly bent in a V shape along the second direction, the second direction is perpendicular to the first direction, at least one side of the fin 4 has a plurality of Protruding portion 41 for turbulence; multiple heat exchange tubes 3 passing through fins 4 along the first direction; shell, heat exchange tubes 3 and fins 4 are arranged in the shell, and the shell has a flue gas inlet and the flue gas outlet, the flue gas flow path is formed between the flue gas inlet and the flue gas outlet, the part of the flue gas flow path flowing through the heat exchange tube 3 and the fin 4 extends along the third direction as a whole, and the third direction is perpendicular to the first direction and the second direction.

As shown in FIGS. 1 to 4 , a plurality of fins 4 can be arranged in a row along the first direction X, and there is a certain gap between adjacent fins 4 . Each fin 4 may be substantially rectangular. As shown in FIG. 1 , FIG. 4 to FIG. 6 , and FIG. 8 , each fin 4 is repeatedly bent in a V shape along the second direction Y, and the second direction is substantially perpendicular to the first direction.

As shown in FIG. 5 to FIG. 14 , at least one side of the fin 4 has a plurality of protrusions 41 that disturb the flow of the smoke. The heat exchange tubes 3 and the fins 4 are arranged in the shell, and the shell has a flue gas inlet and a flue gas outlet, and a flue gas flow path is formed between the flue gas inlet and the flue gas outlet, as shown in Figure 1, the flue gas flow path The part flowing through the heat exchange tubes 3 and the fins 4 extends along a third direction Z as a whole, and the third direction is perpendicular to the first direction and the second direction.

A plurality of heat exchange tubes 3 pass through the fins 4 along a first direction. As shown in Figures 1 to 4, in a specific embodiment, in the plane formed by the first direction and the second direction, the heat exchange tubes 3 meander through the fins 4, and the adjacent heat exchange tubes 3 There are gaps between the rows to form at least part of the flue gas flow path. The gaps between adjacent rows of heat exchange tubes 3 and between adjacent fins 4 jointly form a part of the flue gas flow channel.

As shown in FIG. 8 , a plurality of protrusions 41 are located in gaps between adjacent rows of heat exchange tubes 3 . As shown in FIG. 1 , a plurality of heat exchange tubes 3 are arranged in a row along the third direction. The heat exchange tube 3 passes through the bends of the fins 4 , and the raised portion 41 is located at a plane between adjacent bends of the fins 4 . In order to make it convenient for each heat exchange tube 3 to pass through the bend of the fin 4 , adjacent heat exchange tubes 3 are arranged in parallel or forked rows.

When the flue gas enters from the flue gas inlet, it enters the heat exchanger through the flue gas flow channel between two adjacent fins 4 . With the blocking effect of the part 41, part of the smoke flows through the gap between the adjacent raised parts 41, and the other part of the smoke flows through the gap between the raised part 41 and the adjacent fins 4, so that the smoke laminar flow boundary The layer is destroyed, and the turbulence effect is enhanced, thereby strengthening the convection of the flue gas between the fins 4, so as to improve the heat exchange efficiency between the flue gas and the heat exchange medium in the heat exchange tube 3, and the flue gas after heat exchange passes through the flue gas The gas outlet flows out.

As feasible, as shown in FIG. 5 to FIG. 8 , the protruding portion 41 may be V-shaped, and the sharp corner of the lower end of the V-shape faces the direction of the smoke flow. Since the two ends of the V-shape are respectively facing the direction of the flue gas flow, it can further increase the degree of damage to the laminar boundary layer of the flue gas, the turbulence effect can be further enhanced, and the convection effect of the flue gas between the fins 4 can be improved. Further strengthening. In the above structure, the V-shaped raised part 41 and the repeatedly V-shaped bent fins 4 are designed as a whole, and combined with the heat exchange tube 3 to form a flue gas heat exchange device without other internal connecting parts. Compared with the fin 4 heat exchanger with fin 4 fixing device, it is simpler and more convenient in structure, which can greatly reduce the risk of spoiler and other devices falling off, and the integrity of the device structure is better.

In other feasible implementation manners, for example, as shown in FIG. 9 , the protruding portion 41 may be in an S-shape, and two ends of the S-shape respectively face the second direction. In this way, one end of the S-shape can be used to face the direction of the flue gas flow, so as to further increase the degree of damage to the laminar flow boundary layer of the flue gas. For another example, as shown in FIG. 14 , the protruding portion 41 is linear and extends along the third direction.

In other feasible implementation manners, as shown in FIGS. 10 to 13 , the protrusion 41 may have a predetermined shape with holes, and the predetermined shape includes at least one of the following: rectangle, ellipse, and trapezoid. The ellipse can be a partial ellipse, a somewhat rounded ellipse, or a somewhat elongated ellipse. A hole is opened under the preset shape, not only using the degree of destruction of the smoke laminar boundary layer by the preset shape, but also allowing the smoke on one side of the fin 4 to enter the other side of the fin 4 through the hole during the flow process. One side, so as to further damage the laminar boundary layer during the flow of the flue gas in the flue gas flow channel on the other side, and increase the turbulence effect in another way, so that the flue gas between the fins 4 can also be strengthened Convection, so the heat exchange efficiency between flue gas and participating heat exchange medium can be further enhanced.

As feasible, as shown in Figure 1, the flue gas heat exchange device may also include: a water inlet pipe 1 extending along a third direction and an outlet pipe 2 extending along a third direction, one end of a plurality of heat exchange pipes 3 is connected to the water inlet pipe 1, and the other ends of the plurality of heat exchange tubes 3 are connected to the water outlet tube 2. The delivery of the heat exchange medium in the plurality of heat exchange tubes 3 is realized through the water outlet pipe 2 and the water inlet pipe 1 . Further, the water inlet of the water inlet pipe 1 and the water outlet of the water outlet pipe 2 are both facing the direction of flue gas flow.

The flue gas heat exchange device in this application can destroy the boundary layer in the flue gas flow process, so that the flue gas and the heat exchange medium can perform better heat exchange, and realize the deep waste heat recovery of the flue gas. As a deep waste heat recovery device, the flue gas heat exchange device can not only absorb the sensible heat in the flue gas of the gas-fired boiler, but also absorb its latent heat, that is, the high-efficiency flue gas heat exchange device makes a large amount of water vapor in the flue gas cool down. Condensate into condensed water, and at the same time, by setting up a water treatment device, it can replenish water for the system. In the long run, the deep waste heat recovery of gas-fired boilers and the reuse of condensed water can not only play a role in energy saving and environmental protection, but also reduce heating operation costs and increase corporate profits. Therefore, the use of flue gas depth in gas-fired boiler Waste heat recovery technology is very necessary.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of" describing a combination shall include the identified elements, ingredients, parts or steps as well as other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. Use of the terms "comprising" or "comprising" to describe a combination of elements, ingredients, parts or steps herein also contemplates an embodiment that consists essentially of these elements, ingredients, parts or steps. By using the term "may" herein, it is intended that inclusion of "may" in any of the described attributes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step may be divided into separate plural elements, ingredients, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not meant to exclude other elements, ingredients, parts or steps.

The above are only a few embodiments of the present utility model. Although the disclosed embodiments of the present utility model are as above, the content is only for the convenience of understanding the present utility model and is not intended to limit the present utility model. Anyone skilled in the technical field to which the utility model belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the utility model, but the patent of the utility model The scope of protection must still be based on the scope defined in the appended claims.

Claims (8)

1. A flue gas heat exchange device for a gas boiler, comprising:

the smoke-free air conditioner comprises a plurality of fins arranged in a first direction, wherein each fin is repeatedly bent in a V shape in a second direction, the second direction is vertical to the first direction, and at least one side of each fin is provided with a plurality of protruding parts which play a role in disturbing flow of smoke;

a plurality of heat exchange tubes passing through the fins in the first direction;

the heat exchange tube with the fin sets up in the casing, the casing has flue gas inlet and exhanst gas outlet, the flue gas inlet with form the flue gas runner between the exhanst gas outlet, the flue gas runner flows through the heat exchange tube with the part of fin is whole to be extended along the third direction, the third direction perpendicular to first direction with the second direction.

2. The flue gas heat exchange apparatus for a gas boiler of claim 1, wherein said heat exchange tubes are serpentine across said fins in a plane formed by said first and second directions, with gaps between adjacent rows of said heat exchange tubes to form at least part of said flue gas flow path; the raised portions are located at gaps between adjacent rows of the heat exchange tubes.

3. The flue gas heat exchange device for a gas boiler as recited in claim 2, wherein a plurality of said heat exchange tubes are arranged in said third direction; and the adjacent heat exchange tubes are arranged in a row or in a staggered manner.

4. The flue gas heat exchange device for a gas boiler according to claim 3, wherein a plurality of the protrusions are arranged in the third direction.

5. The flue gas heat exchange device for a gas boiler according to claim 1, wherein the heat exchange tubes pass at the bends of the fins, and the projections are located at the planes between adjacent bends of the fins.

6. The flue gas heat exchange device for a gas boiler according to claim 1, wherein said protrusions are shaped and perforated, said predetermined shape comprising at least one of: rectangular, oval, trapezoidal.

7. The flue gas heat exchange device for a gas boiler according to claim 1, wherein the protrusion is linear and extends in the third direction.

8. The flue gas heat exchange device for a gas boiler according to claim 1, further comprising: follow the inlet tube that the third direction extends and follow the outlet pipe that the third direction extends, it is a plurality of the one end of heat exchange tube with the inlet tube is connected, and is a plurality of the other end of heat exchange tube with the outlet pipe is connected, the water inlet of inlet tube with the delivery port of outlet pipe all faces the incoming flow direction of flue gas.

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