A boiler flue gas waste heat utilization device

Abstract

This utility model discloses a boiler flue gas waste heat utilization device, which includes a boiler body, a first flue gas heat exchanger, and a collection device. An air inlet is fixedly connected to the top of the first flue gas heat exchanger near the left side, a flue gas discharge chimney is fixedly connected to the top center of the first flue gas heat exchanger, a liquid inlet is fixedly connected to the top of the first flue gas heat exchanger near the right side, and a low-temperature flue gas discharge pipe is fixedly connected to the middle center near the right side of the first flue gas heat exchanger. This device uses a collection device to collect, compress, and heat the low-temperature flue gas. The liquid in the low-temperature flue gas is turned into gas by the action of the evaporator. The gas enters the compressor for compression and heating, and is then transported to the second flue gas heat exchanger for secondary recovery, which significantly improves the thermal energy utilization rate of the low-temperature flue gas and reduces energy waste.

Description

Technical Field

[0001] This utility model relates to the technical field of waste heat utilization devices, and in particular to a waste heat utilization device for boiler flue gas. Background Technology

[0002] During boiler operation, a large amount of flue gas containing underutilized heat energy is generated. If this flue gas is directly discharged into the atmosphere, it will lead to a significant waste of heat energy resources and may cause an increase in the ambient temperature. Therefore, a boiler flue gas waste heat recovery system has been developed, which can effectively capture and reuse the heat energy in the flue gas. In this way, not only is energy saving achieved, but it also plays a role in protecting the environment.

[0003] A search revealed Chinese Patent Publication No. CN106500517A, which discloses an industrial boiler flue gas waste heat recovery and utilization device. The device includes a base, an industrial boiler, a flue gas filter box, a coal preheating box, and an ash collection box. The flue gas filter box and the coal preheating box are respectively installed between the columns mounted on the base. A second dust suction hood is fixedly installed at the lower part of the flue gas filter box, and the upper part of the second dust suction hood is interconnected with the lower part of the flue gas filter box. The coal preheating box is rotatably connected to the two columns via rolling bearings. An exhaust pipe is located directly below the coal preheating box, and the exhaust pipe is interconnected with the suction pipe via a negative pressure fan. The exhaust pipe is located directly above the ash collection box. The coal preheating box includes a surrounding plate, a movable cover, side plates, and a rotating rod. Multiple filter screens are fixedly installed inside the flue gas filter box from top to bottom. This invention has a simple structure and reasonable design, effectively utilizing the waste heat of the flue gas in the boiler to dry and preheat coal, improving coal combustion efficiency, and is highly practical. However, the device performs preliminary recovery and utilization of the waste heat of the flue gas. After the preliminary utilization, the waste heat inside the low-temperature flue gas is not fully utilized, resulting in energy waste and incomplete recovery, which affects the overall energy utilization efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a boiler flue gas waste heat utilization device, which solves the problem that ordinary waste heat recovery devices in the prior art cannot recover and utilize low-temperature flue gas.

[0005] To achieve the above objectives, a boiler flue gas waste heat utilization device is provided, comprising a boiler body, a first flue gas heat exchanger, and a collection device. An air inlet is fixedly connected to the upper left side of the top of the first flue gas heat exchanger, a flue gas discharge chimney is fixedly connected to the middle of the upper top of the first flue gas heat exchanger, a liquid inlet is fixedly connected to the upper right side of the top of the first flue gas heat exchanger, a low-temperature flue gas discharge pipe is fixedly connected to the middle right side of the first flue gas heat exchanger, a fixed base frame is fixedly connected to the lower bottom of the first flue gas heat exchanger, and a high-temperature liquid discharge pipe is fixedly connected to the middle left side of the first flue gas heat exchanger.

[0006] The gathering device includes an evaporator and a compressor. The bottom of the gathering device has a bottom groove and two sliding grooves at both ends. A condensate collection tank is slidably connected in the bottom groove. The left and right ends of the condensate collection tank are fixedly connected to sliders, which are slidably connected to the sliding grooves. A flue gas exhaust pipe is fixedly connected to one end of the gathering device near the right side.

[0007] According to the aforementioned boiler flue gas waste heat utilization device, the outer surface of the boiler body is covered with a protective coating, and a fixed base is fixedly connected to the bottom of the boiler body.

[0008] According to the aforementioned boiler flue gas waste heat utilization device, an air outlet is fixedly connected to the top of the boiler body, and a flue gas exhaust device is fixedly connected to the top of the air outlet.

[0009] According to the aforementioned boiler flue gas waste heat utilization device, a control valve is fixedly connected to the connecting end of the flue gas device, and an outlet connecting pipe is fixedly connected to the connecting end of the control valve, with the other end of the outlet connecting pipe fixedly connected to the inlet.

[0010] According to the aforementioned boiler flue gas waste heat utilization device, the other end of the flue gas discharge pipe is fixedly connected to a second flue gas heat exchanger, and a liquid inlet pipe is fixedly connected above the top of the second flue gas heat exchanger.

[0011] According to the aforementioned boiler flue gas waste heat utilization device, a heat dissipation groove is provided above the middle part of the second flue gas heat exchanger, and a heat dissipation fan is provided below the bottom of the heat dissipation groove.

[0012] According to the aforementioned boiler flue gas waste heat utilization device, a second flue gas discharge pipe is fixedly connected to the middle right side of the second flue gas heat exchanger, and a liquid discharge pipe is fixedly connected to one end of the second flue gas discharge pipe that is close to it.

[0013] According to the boiler flue gas waste heat utilization device, the protective coating includes a protective layer, an anti-corrosion layer, and a heat-resistant layer.

[0014] The above-mentioned solution has the following beneficial effects:

[0015] 1. The device uses a collection device to collect and compress the low-temperature flue gas. The liquid in the low-temperature flue gas is turned into gas by the action of the evaporator. The gas enters the compressor for compression and heating, and is then transported to the second flue gas heat exchanger for secondary recovery. This significantly improves the thermal energy utilization rate of the low-temperature flue gas and reduces energy waste.

[0016] 2. The device uses a first flue gas heat exchanger and a second flue gas heat exchanger to recover waste heat from high-temperature and low-temperature flue gas, realizing the cascade utilization of flue gas waste heat, further improving the thermal energy conversion efficiency, optimizing the energy structure, reducing operating costs, and having significant implications for environmental protection.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a schematic diagram of the overall structure of a boiler flue gas waste heat utilization device according to the present invention.

[0020] Figure 2 This is a schematic diagram of the first flue gas heat exchanger structure of a boiler flue gas waste heat utilization device according to the present invention.

[0021] Figure 3 This is a schematic diagram of the collecting device structure of a boiler flue gas waste heat utilization device according to the present invention.

[0022] Figure 4 This is a schematic diagram of the protective coating structure of a boiler flue gas waste heat utilization device according to the present invention.

[0023] Legend:

[0024] 1. Boiler body; 101. Protective coating; 102. Fixed base; 103. Air outlet; 104. Flue gas exhaust device; 105. Control valve; 106. Air outlet connection pipe; 107. Protective layer; 108. Corrosion-resistant layer; 109. Heat-resistant layer; 2. First flue gas heat exchanger; 201. Air inlet; 202. Flue gas exhaust chimney; 203. Liquid inlet; 204. Low-temperature flue gas exhaust pipe; 205. Fixed base frame; 206. High-temperature liquid exhaust pipe; 3. Gathering device; 301. Evaporator; 302. Compressor; 303. Bottom slot; 304. Condensate collection tank; 305. Sliding block; 306. Flue gas exhaust pipe; 4. Second flue gas heat exchanger; 401. Liquid inlet pipe; 402. Heat dissipation trough; 403. Heat dissipation fan; 404. Second flue gas exhaust pipe; 405. Liquid exhaust pipe. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] Reference Figure 1-4 This utility model discloses a boiler flue gas waste heat utilization device, comprising: a boiler body 1, a first flue gas heat exchanger 2, and a collection device 3. An air inlet 201 is fixedly connected to the upper left side of the top of the first flue gas heat exchanger 2, serving as the entry point for flue gas into the interior of the first flue gas heat exchanger 2. A flue gas discharge chimney 202 is fixedly connected to the middle of the upper top of the first flue gas heat exchanger 2, capable of discharging excess low-temperature flue gas and preventing excessive internal pressure. The upper right side of the top of the first flue gas heat exchanger 2 is fixedly connected to... The device is connected to an inlet 203, which is the channel for liquid to enter the device for heat exchange. A low-temperature flue gas discharge pipe 204 is fixedly connected to the middle of the first flue gas heat exchanger 2 near the right side. The low-temperature flue gas discharge pipe 204 transports the flue gas that has undergone preliminary recovery to the collection device 3. A fixed base frame 205 is fixedly connected to the bottom of the first flue gas heat exchanger 2. A high-temperature liquid discharge pipe 206 is fixedly connected to the middle of the first flue gas heat exchanger 2 near the left side. The high-temperature liquid discharge pipe 206 transports the high-temperature liquid after heat exchange to other devices for storage.

[0027] The gathering device 3 includes an evaporator 301 and a compressor 302. A bottom groove 303 is provided at the bottom of the gathering device 3, and sliding grooves are provided at both ends. A condensate collection tank 304 is slidably connected in the bottom groove 303. A slider 305 is fixedly connected to the left and right ends of the condensate collection tank 304, and the slider 305 is slidably connected to the sliding groove. A flue gas discharge pipe 306 is fixedly connected to one end of the middle of the gathering device 3 near the right side. The gathering device 3 is used to collect, compress and heat low-temperature flue gas. The liquid in the low-temperature flue gas becomes gas under the action of the evaporator 301. The gas enters the compressor 302 for compression and heating, and is transported to the second flue gas heat exchanger 4 through the flue gas discharge pipe 306.

[0028] The outer surface of the boiler body 1 is covered with a protective coating 101, and a fixed base 102 is fixedly connected to the bottom of the boiler body 1. The protective coating 101 can effectively prevent the boiler body 1 from being damaged by high temperature oxidation, and the fixed base 102 ensures the stable operation of the boiler body 1.

[0029] An exhaust port 103 is fixedly connected to the top of the boiler body 1, and a flue gas exhaust device 104 is fixedly connected to the top of the exhaust port 103. The flue gas exhaust device 104 can effectively exhaust the high-temperature flue gas generated by the boiler body 1, avoid excessive internal pressure, and ensure safe operation.

[0030] A control valve 105 is fixedly connected to the connection end of the smoke exhaust device 104. An outlet connection pipe 106 is fixedly connected to the connection end of the control valve 105, and the other end of the outlet connection pipe 106 is fixedly connected to the inlet 201. The control valve 105 regulates the flow of flue gas to ensure stable operation of the system. The outlet connection pipe 106 introduces high-temperature flue gas into the inlet 201.

[0031] The other end of the flue gas discharge pipe 306 is fixedly connected to the second flue gas heat exchanger 4. A liquid inlet pipe 401 is fixedly connected above the top of the second flue gas heat exchanger 4. The liquid inlet pipe 401 is the channel for high-temperature liquid to enter the second flue gas heat exchanger 4.

[0032] A heat dissipation groove 402 is provided in the upper middle part of the second flue gas heat exchanger 4, and a cooling fan 403 is provided at the bottom of the heat dissipation groove 402. The cooling fan 403 accelerates air circulation, improves heat dissipation efficiency, and ensures stable operation of the second flue gas heat exchanger 4.

[0033] The second flue gas heat exchanger 4 is fixedly connected to the middle right side of the second flue gas heat exchanger 4. A liquid discharge pipe 405 is fixedly connected to one end of the second flue gas heat exchanger 404. The second flue gas heat exchanger 404 transports the secondary recovered flue gas to the ventilation duct, and the liquid discharge pipe 405 transports the heat exchanged liquid to the storage device to ensure efficient system circulation.

[0034] The protective coating 101 includes a protective layer 107, an anti-corrosion layer 108, and a heat-resistant layer 109. The protective layer 107 resists external impacts, the anti-corrosion layer 108 prevents chemical corrosion, and the heat-resistant layer 109 resists the effects of high temperatures. The three layers work together to extend the service life of the boiler body 1 and ensure its long-term stable operation.

[0035] Working principle: When the device is in use, the boiler body 1 first discharges the high-temperature flue gas generated inside through the outlet 103. The flow rate is adjusted by the control valve 105. The high-temperature flue gas is introduced into the inlet 201 through the outlet connection pipe 106. The first flue gas heat exchanger 2 exchanges heat with the high-temperature flue gas. The flue gas after heat exchange enters the collecting device 3 through the low-temperature flue gas discharge pipe 204. The collecting device 3 collects, compresses and heats the low-temperature flue gas. The liquid in the low-temperature flue gas becomes gas under the action of the evaporator 301. The gas enters the compressor 302 for compression and heating. It is then transported to the second flue gas heat exchanger 4 through the flue gas discharge pipe 306. The second flue gas heat exchanger 4 exchanges heat again. The high-temperature liquid after heat exchange enters the storage device through the liquid discharge pipe 405. The system operates in a high-efficiency cycle, ensuring full utilization of energy. All components work together to improve the overall thermal efficiency.

[0036] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A boiler flue gas waste heat utilization device, comprising: The boiler body (1), the first flue gas heat exchanger (2) and the collecting device (3) are characterized in that an air inlet (201) is fixedly connected to the upper left side of the top of the first flue gas heat exchanger (2), a flue gas exhaust chimney (202) is fixedly connected to the middle of the upper top of the first flue gas heat exchanger (2), a liquid inlet (203) is fixedly connected to the upper right side of the top of the first flue gas heat exchanger (2), a low temperature flue gas exhaust pipe (204) is fixedly connected to the middle right side of the first flue gas heat exchanger (2), a fixed base frame (205) is fixedly connected to the bottom of the first flue gas heat exchanger (2), and a high temperature liquid exhaust pipe (206) is fixedly connected to the middle left side of the first flue gas heat exchanger (2). The gathering device (3) includes an evaporator (301) and a compressor (302). The bottom of the gathering device (3) has a bottom groove (303) and sliding grooves at both ends. A condensate collection tank (304) is slidably connected in the bottom groove (303). A slider (305) is fixedly connected to the left and right ends of the condensate collection tank (304), and the slider (305) is slidably connected to the sliding groove. A flue gas exhaust pipe (306) is fixedly connected to one end of the middle of the gathering device (3) near the right side.

2. A boiler flue gas waste heat utilization device according to claim 1, characterized in that, The outer surface of the boiler body (1) is covered with a protective coating (101), and a fixed base (102) is fixedly connected to the bottom of the boiler body (1).

3. A boiler flue gas waste heat utilization device according to claim 1, characterized in that, An air outlet (103) is fixedly connected to the top of the boiler body (1), and a flue gas device (104) is fixedly connected to the top of the air outlet (103).

4. A boiler flue gas waste heat utilization device according to claim 3, characterized in that, The smoke exhaust device (104) is fixedly connected to a control valve (105), and the control valve (105) is fixedly connected to an exhaust pipe (106), with the other end of the exhaust pipe (106) fixedly connected to the air inlet (201).

5. A boiler flue gas waste heat utilization device according to claim 1, characterized in that, The other end of the flue gas discharge pipe (306) is fixedly connected to the second flue gas heat exchanger (4), and a liquid inlet pipe (401) is fixedly connected above the top of the second flue gas heat exchanger (4).

6. A boiler flue gas waste heat utilization device according to claim 5, characterized in that, The second flue gas heat exchanger (4) has a heat dissipation groove (402) above the middle part, and a heat dissipation fan (403) is provided below the bottom of the heat dissipation groove (402).

7. A boiler flue gas waste heat utilization device according to claim 5, characterized in that, The second flue gas heat exchanger (4) is fixedly connected to the middle of the right side of the second flue gas heat exchanger (4), and a liquid discharge pipe (405) is fixedly connected to the end of the second flue gas discharge pipe (404) near the other end.

8. A boiler flue gas waste heat utilization device according to claim 2, characterized in that, The protective coating (101) includes a protective layer (107), an anti-corrosion layer (108), and a heat-resistant layer (109).

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