Flue gas heat exchange device for boiler
By designing a flue gas heat exchange device for boilers, using the front intake bucket, return pipe and activated carbon filter mechanism, the problems of low waste heat utilization rate of flue gas and incomplete dust purification in the prior art are solved, and efficient flue gas heat utilization and purification effects are achieved.
Patent Information
- Application Number
- CN202421984685.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The existing boiler flue gas waste heat utilization device has low flue gas waste heat utilization rate and cannot effectively eliminate dust in the flue gas, resulting in the inability to achieve the effect of flue gas purification.
A flue gas heat exchange device for boilers is designed. The flue gas is cooled and heat exchanged through the cooperation of the front inlet bucket, the rear exhaust bucket, the return pipe and the connecting flange. At the same time, the dust in the flue gas is extracted and cleaned by using a smoke exhaust fan and an activated carbon filter mechanism.
It effectively improves the utilization rate of flue gas waste heat, reduces energy consumption, and significantly reduces the smoke content in the flue gas through activated carbon filtration, achieving the purpose of flue gas purification.
Smart Images
Figure CN223020327U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boiler waste heat recovery, in particular to a flue gas heat exchange device for boilers. Background Technique
[0002] The flue gas heat exchange device of a boiler refers to a device that, during the operation of the boiler, utilizes the heat energy in the flue gas generated by combustion to transfer part of the heat energy to water or other media through heat exchange. These devices are designed to improve the thermal efficiency of the boiler, reduce energy losses, and lower emissions. These devices transfer the high-temperature heat energy in the flue gas to water or air to achieve the reuse of energy, improve the thermal efficiency of the entire system, reduce energy consumption, and also help reduce environmental pollution.
[0003] After retrieval, the existing Chinese patent publication number is: CN218672235U, which provides a boiler flue gas waste heat utilization processing device. In this patent, the heat exchange tubes are vertically and equidistantly arranged on both sides inside the heat exchange box, enabling the water at each height to conduct heat exchange with the heat exchange tubes to ensure uniform heat transfer.
[0004] Although the above patent can conduct heat exchange on the flue gas generated during the use of the boiler, the above-mentioned boiler flue gas waste heat utilization processing device still has the following problems: the utilization rate of flue gas waste heat is not high, it cannot effectively remove the dust in the flue gas, and it fails to achieve the effect of flue gas purification.
[0005] In view of the above problems, for this reason, a flue gas heat exchange device for boilers is proposed. Content of the Utility Model
[0006] The purpose of the utility model is to provide a flue gas heat exchange device for boilers, which solves the problem of effectively removing the dust in the flue gas in the background technique.
[0007] To achieve the above purpose, the utility model provides the following technical solution: A flue gas heat exchange device for boilers, including an exchange box, a sealing strip is fixedly connected to the front side of the exchange box, an air inlet hopper is fixedly connected to the inner wall of the sealing strip, a connection flange is fixedly connected through and to the front side of the air inlet hopper, a smoke exhaust hole is penetrated and arranged on the left side of the inner wall of the exchange box, a smoke exhaust fan is arranged in the smoke exhaust hole, a smoke collecting pipe is fixedly connected through and to the left side of the smoke exhaust hole, a smoke collecting box is arranged on the top of the exchange box, a drain pipe is fixedly connected through and to the bottom of the rear side of the exchange box, a water inlet pipe is fixedly connected through and to the top of the rear side of the exchange box, a connection hole is penetrated and arranged on the left side of the smoke collecting box, a connection block is fixedly connected through and to the top of the smoke collecting box, and a filtering mechanism is arranged on the top of the connection block.
[0008] By adopting the above technical solution, through the mutual cooperation among the front air inlet hopper, the rear air outlet hopper, the return pipe and the connecting flange, the flue gas generated by combustion enters the exchange box from the front air inlet hopper connected by the connecting flange. The return pipe in the exchange box cools the incoming hot flue gas, thereby reducing energy consumption. The exhaust fan extracts the dust generated by the boiler flue gas, and the soot enters the smoke collecting box along the collecting pipe. The activated carbon adsorbs and cleans the harmful substances in the soot, effectively reducing the soot in the flue gas, which is beneficial to purification and makes full use of the heat at the same time.
[0009] As a further description of the above technical solution: The filtering mechanism includes a connecting pipe, which penetrates and is fixedly connected to the connecting block. The inner wall of the connecting pipe is provided with activated carbon, and a smoke outlet pipe is fixedly connected through the top of the connecting pipe.
[0010] By adopting the above technical solution, the activated carbon in the connecting pipe can adsorb the harmful soot in the flue gas, effectively reducing the soot in the flue gas and being beneficial to purifying the environment.
[0011] As a further description of the above technical solution: A sealing strip is fixedly connected to the rear side of the exchange box, and a rear air outlet hopper is fixedly connected to the inner wall of the sealing strip. A connecting flange is fixedly connected through the rear side of the rear air outlet hopper.
[0012] By adopting the above technical solution, the generated hot flue gas is sent into the exchange box from the front connecting flange of the front air inlet hopper.
[0013] As a further description of the above technical solution: A filter screen is fixedly connected to the top inner wall of the smoke collecting box, and the filter screen is located at the bottom of the connecting pipe.
[0014] By adopting the above technical solution, the filter screen arranged at the top of the smoke collecting box filters the soot in the flue gas and can filter out large-particle soot.
[0015] As a further description of the above technical solution: A bottom plate is arranged at the bottom of the exchange box, and support columns are fixedly connected to the four corners of the bottom of the bottom plate.
[0016] By adopting the above technical solution, the support columns can absorb the heat of the flue gas for heat exchange, facilitating heat exchange of the boiler.
[0017] As a further description of the above technical solution: A connecting ring is fixedly connected through the bottom inner wall of the exchange box, and a fan is fixedly connected to the inner wall of the connecting ring.
[0018] By adopting the above technical solution, the fan blows the flue gas upward, and the exhaust fan in the exhaust hole extracts the flue gas at the top of the exchange box.
[0019] As a further description of the above technical solution: on the left and right sides of the inner wall of the exchange box, there are uniformly distributed return pipes running through and fixedly connected.
[0020] By adopting the above technical solution, the cold water in the return pipe in the exchange box can absorb the heat in the flue gas after contacting the hot flue gas.
[0021] As a further description of the above technical solution: on the left side of the smoke collecting pipe, there is a collecting pipe running through and fixedly connected, and the collecting pipe is fixedly connected through and between the connection holes.
[0022] By adopting the above technical solution, the exhaust fan in the exhaust hole extracts the flue gas in the exchange box, and the extracted flue gas enters the smoke collecting box through the collecting pipe.
[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0024] 1. For a flue gas heat exchange device for a boiler provided by the present utility model, first, through the mutual cooperation among the front air inlet hopper, the rear air outlet hopper, the return pipe and the connecting flange, the flue gas generated by combustion enters the exchange box from the front air inlet hopper connected by the connecting flange, and the return pipe in the exchange box cools the incoming hot flue gas, thereby reducing energy consumption.
[0025] 2. For a flue gas heat exchange device for a boiler provided by the present utility model, the dust generated by the boiler flue gas is extracted by the exhaust fan, and the soot enters the smoke collecting box along with the collecting pipe. The activated carbon adsorbs and cleans the harmful substances in the soot, effectively reducing the harmful substances in the flue gas, which is beneficial to purification and makes full use of the heat at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a front view three-dimensional structure schematic diagram of the whole of the present utility model;
[0027] Figure 2 It is a side view three-dimensional structure schematic diagram of the whole of the present utility model;
[0028] Figure 3 It is an internal three-dimensional structure schematic diagram of the whole of the present utility model;
[0029] Figure 4 It is a structure schematic diagram of the smoke exhaust box of the present utility model.
[0030] In the figure: 1. Exchange box; 2. Collection pipe; 3. Smoke collection pipe; 4. Sealing strip; 5. Front air intake hopper; 6. Connecting flange; 7. Bottom plate; 8. Support column; 9. Return pipe; 10. Smoke collection box; 11. Rear air outlet hopper; 12. Drain pipe; 13. Water inlet pipe; 14. Connecting block; 15. Exhaust fan; 16. Exhaust hole; 17. Connecting ring; 18. Fan; 19. Smoke outlet pipe; 20. Connecting pipe; 21. Activated carbon; 22. Filter screen; 23. Connecting hole. Detailed implementation manner
[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0032] To further understand the content of the present invention, the present invention will be described in detail with reference to the accompanying drawings.
[0033] Refer to Figures 1-3 , a flue gas heat exchange device for a boiler of the present invention includes an exchange box 1. A sealing strip 4 is fixedly connected to the front side of the exchange box 1. The inner wall of the sealing strip 4 is fixedly connected with a front air intake hopper 5. The front side of the front air intake hopper 5 penetrates and is fixedly connected with a connecting flange 6. A smoke exhaust hole 16 is penetrated and arranged on the left side of the inner wall of the exchange box 1. An exhaust fan 15 is arranged in the smoke exhaust hole 16. The left side of the smoke exhaust hole 16 penetrates and is fixedly connected with a smoke collection pipe 3. A smoke collection box 10 is arranged on the top of the exchange box 1. A drain pipe 12 penetrates and is fixedly connected to the bottom of the rear side of the exchange box 1. A water inlet pipe 13 penetrates and is fixedly connected to the top of the rear side of the exchange box 1. A sealing strip 4 is fixedly connected to the rear side of the exchange box 1. The inner wall of the sealing strip 4 is fixedly connected with a rear air outlet hopper 11. The rear side of the rear air outlet hopper 11 penetrates and is fixedly connected with a connecting flange 6. A bottom plate 7 is arranged at the bottom of the exchange box 1. Four corners of the bottom of the bottom plate 7 are fixedly connected with support columns 8. A connecting ring 17 penetrates and is fixedly connected to the bottom of the inner wall of the exchange box 1. The inner wall of the connecting ring 17 is fixedly connected with a fan 18. Uniformly distributed return pipes 9 penetrate and are fixedly connected to the left and right sides of the inner wall of the exchange box 1. The left side of the smoke collection pipe 3 penetrates and is fixedly connected with a collection pipe 2.
[0034] Through the mutual cooperation among the front air intake hopper 5, the rear air outlet hopper 11, the return pipe 9 and the connecting flange 6, the flue gas generated by combustion enters the exchange box 1 from the front air intake hopper 5 connected to the connecting flange 6. The return pipe 9 in the exchange box 1 cools the incoming hot flue gas, and the return pipe 9 exchanges heat with the heat in the hot flue gas. At the same time, the exhaust fan 15 sucks in the flue gas, achieving the purpose of saving fuel and being environmentally friendly. The exhaust fan 15 extracts the dust generated by the boiler flue gas, and the soot enters the smoke collecting box 10 along the collecting pipe 2. The activated carbon 21 adsorbs and cleans the harmful substances in the soot, effectively reducing the harmful substances in the flue gas and facilitating purification while making full use of the heat.
[0035] Refer to Figure 3 and Figure 4 , a connecting block 14 penetrates and is fixedly connected to the top of the smoke collecting box 10. A filtering mechanism is arranged on the top of the connecting block 14. The filtering mechanism includes a connecting pipe 20. The connecting pipe 20 penetrates and is fixedly connected to the connecting block 14. The inner wall of the connecting pipe 20 is provided with activated carbon 21. The top of the connecting pipe 20 penetrates and is fixedly connected to a smoke outlet cylinder 19.
[0036] The filtered flue gas enters the smoke collecting box 10. The connecting pipe 20 connected to the top of the smoke collecting box 10, and the activated carbon 21 in the connecting pipe 20 can absorb the soot in the flue gas, reducing environmental pollution and facilitating environmental purification. The return pipe 9 exchanges heat with the heat in the hot flue gas, and at the same time, the exhaust fan 15 sucks in the flue gas, achieving the purpose of saving fuel and being environmentally friendly.
[0037] Refer to Figure 4 , a connecting hole 23 penetrates and is arranged on the left side of the smoke collecting box 10, and the collecting pipe 2 penetrates and is fixedly connected to the connecting hole 23. A filter screen 22 is fixedly connected to the top inner wall of the smoke collecting box 10, and the filter screen 22 is located at the bottom of the connecting pipe 20.
[0038] The filter screen 22 arranged on the top of the smoke collecting box 10 filters the soot in the flue gas. The connecting pipe 20 fixedly connected to the connecting block 14 after filtering, and the activated carbon 21 in the connecting pipe 20 can adsorb the harmful soot in the flue gas, effectively reducing the soot in the flue gas.
[0039] Working principle: The hot flue gas generated during the operation of the boiler is sent into the exchange box 1 through the front-side connecting flange 6 of the forward air inlet hopper 5. Connect the water inlet pipe 13 and the drain pipe 12 on one side of the exchange box 1. The water inlet pipe 13 is connected to the cold water pipe, and the drain pipe 12 is connected back to the boiler for heating again. The cold water in the return pipe 9 in the exchange box 1 can absorb the heat in the flue gas after contacting the hot flue gas. The temperature of the cold water in the return pipe 9 that absorbs the heat rises and returns to the boiler through the drain pipe 12 again, which can effectively reduce energy consumption and make full use of the heat in the hot flue gas. When the soot in the hot flue gas is in the exchange box 1, the fan 18 at the bottom of the exchange box 1 blows the flue gas upward, and the exhaust fan 15 in the exhaust hole 16 extracts the flue gas in the exchange box 1. The extracted flue gas enters the smoke collecting box 10 through the collecting pipe 2. The filter screen 22 provided at the top of the smoke collecting box 10 filters the soot in the flue gas. The connecting pipe 20 is fixedly connected inside the filtered connecting block 14, and the activated carbon 21 in the connecting pipe 20 can adsorb the harmful soot in the flue gas, effectively reducing the soot in the flue gas and being beneficial to purifying the environment, thereby achieving the effect of flue gas purification.
[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.
[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A flue gas heat exchange device for a boiler, comprising an exchange box (1), characterized in that: The front side of the exchange box (1) is fixedly connected with a sealing strip (4), the inner wall of the sealing strip (4) is fixedly connected with a front air intake hopper (5), the front side of the front air intake hopper (5) is penetrated and fixedly connected with a connecting flange (6), the left side of the inner wall of the exchange box (1) is penetrated and provided with a smoke exhaust hole (16), a smoke exhaust fan (15) is arranged in the smoke exhaust hole (16), the left side of the smoke exhaust hole (16) is penetrated and fixedly connected with a smoke collecting pipe (3), the top of the exchange box (1) is provided with a smoke collecting box (10), the bottom of the rear side of the exchange box (1) is penetrated and fixedly connected with a drain pipe (12), the top of the rear side of the exchange box (1) is penetrated and fixedly connected with a water inlet pipe (13), the left side of the smoke collecting box (10) is penetrated and provided with a connecting hole (23), the top of the smoke collecting box (10) is penetrated and fixedly connected with a connecting block (14), and the top of the connecting block (14) is provided with a filtering mechanism.
2. A flue gas heat exchange device for a boiler according to claim 1, characterized in that: The filtering mechanism comprises a connecting pipe (20), the connecting pipe (20) and the connecting block (14) are penetrated and fixedly connected, the inner wall of the connecting pipe (20) is provided with activated carbon (21), and the top of the connecting pipe (20) is penetrated and fixedly connected with a smoke outlet (19).
3. The flue gas heat exchange device for a boiler according to claim 1, characterized in that: The rear side of the exchange box (1) is fixedly connected to a sealing strip (4), the inner wall of the sealing strip (4) is fixedly connected to a rear air outlet hopper (11), and the rear side of the rear air outlet hopper (11) is penetrated and fixedly connected to a connecting flange (6).
4. The flue gas heat exchange device for a boiler according to claim 1, characterized in that: A filter screen (22) is fixedly connected to the top of the inner wall of the smoke collecting box (10), and the filter screen (22) is located at the bottom of the connecting pipe (20).
5. The flue gas heat exchange device for a boiler according to claim 1, characterized in that: A bottom plate (7) is provided at the bottom of the exchange box (1), and support columns (8) are fixedly connected to the four corners of the bottom of the bottom plate (7).
6. The flue gas heat exchange device for a boiler according to claim 1, characterized in that: A connecting ring (17) penetrates through and is fixedly connected to the bottom of the inner wall of the exchange box (1), and a fan (18) is fixedly connected to the inner wall of the connecting ring (17).
7. The flue gas heat exchange device for a boiler according to claim 1, characterized in that: Evenly distributed return pipes (9) are passed through and fixedly connected to the left and right sides of the inner wall of the exchange box (1).
8. The flue gas heat exchange device for a boiler according to claim 1, characterized in that: The left side of the smoke collecting pipe (3) is penetrated by a collecting pipe (2) and is fixedly connected thereto, and the collecting pipe (2) and the connecting hole (23) are penetrated by and fixedly connected thereto.