Boiler waste heat recovery device

Abstract

The utility model provides a boiler waste heat recovery device, which belongs to the technical field of boiler waste heat recovery equipment and comprises a smoke exhaust pipeline arranged at a smoke exhaust port of a gas-fired hot water boiler, the air outlet end of the smoke exhaust pipeline is communicated with a heat exchange water tank, a purification air pipe is arranged on one side of the heat exchange water tank, and a filter box body is arranged at the air outlet end of the purification air pipe. A cooling bin body is arranged on the side, close to the purification air pipe, of the top in the filtering box body, a first filtering assembly is arranged on the lower portion of the cooling bin body, a plurality of second filtering assemblies are arranged on the side, away from the purification air pipe, of the cooling bin body, and a filtering cotton plate is detachably arranged on the air outlet side of the filtering box body; flue gas is subjected to heat exchange and cooling in the heat exchange water tank, then the cooled flue gas enters the filtering box body, and the flue gas is subjected to primary filtering through the first filtering assembly, secondary filtering through the second filtering assembly, tertiary filtering through the filtering cotton plate and finally discharged into air through flow division, so that the effect of protecting the environment is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler waste heat recovery equipment, specifically to a boiler waste heat recovery device. Background Technology

[0002] To save energy, most factories use a combination of air source heat pumps and boilers to provide centralized heating for domestic hot water. When the environment is unfavorable for air source heat pumps in winter or during rainy weather, the boilers are started to provide heating, thereby meeting the domestic hot water needs of the factory area.

[0003] Most related technologies use gas-fired hot water boilers, which are gas appliances that transfer heat to cold water flowing through a heat exchanger through combustion to produce hot water. However, gas-fired hot water boilers produce a lot of waste gas during actual use, which pollutes the environment and wastes heat energy. Therefore, waste heat recovery equipment for gas-fired hot water boilers is needed to help recover the waste heat.

[0004] Existing waste heat recovery devices for gas-fired hot water boilers mostly discharge the flue gas directly after recovering heat from it. The impurities and other harmful substances contained in the flue gas are released into the air, causing air pollution and thus harming environmental protection. To solve the above problems, a new waste heat recovery device for boilers is proposed. Utility Model Content

[0005] In view of this, the present invention provides a boiler waste heat recovery device. The present invention reduces the temperature of flue gas by exchanging heat in the heat exchange water tank. The cooled flue gas then enters the filter box through the purification air duct. The flue gas is further cooled by the cooling chamber in the filter box. The flue gas is then diverted and filtered once by the first filter component, then twice by the second filter component, and finally three times by the filter cotton plate before being discharged into the air, thereby achieving the effect of protecting the environment.

[0006] To solve the above-mentioned technical problems, this utility model provides a boiler waste heat recovery device, including a flue gas pipe installed at the flue gas outlet of a gas-fired hot water boiler, a heat exchange water tank connected to the air outlet of the flue gas pipe, a serpentine pipe installed inside the heat exchange water tank, a purification air duct installed through the air outlet of the serpentine pipe, a filter box installed at the air outlet of the purification air duct, a cooling chamber installed at the top of the filter box near the purification air duct, a first filter assembly installed at the bottom of the cooling chamber, multiple second filter assemblies installed on the side of the cooling chamber away from the purification air duct, and a filter cotton plate detachably installed on the air outlet side of the filter box.

[0007] Each U-shaped section of the serpentine pipe is equipped with a pipe clamp. The pipe clamp is used to connect and fix the serpentine pipe to the inner wall of the heat exchange water tank, thereby preventing the serpentine pipe from shaking significantly during ventilation. Each pipe clamp is connected to the inner wall of the heat exchange water tank.

[0008] The inlet end of the serpentine duct is equipped with a special-shaped connector, which is used to connect the serpentine duct to the exhaust duct. The inlet end of the special-shaped connector passes through the heat exchange water tank and connects to the outlet end of the exhaust duct.

[0009] A water inlet is connected to one side wall of the heat exchange water tank to supply cold water into the heat exchange water tank, and a water outlet is connected to the other side wall of the heat exchange water tank to discharge the cold water after it has absorbed the heat from the flue gas.

[0010] An exhaust chamber is installed where the purification duct passes through the filter box. The exhaust chamber is used to divert the air in the purification duct, thereby further reducing the heat of the flue gas. Multiple exhaust chambers have multiple exhaust vents on the side away from the purification duct. The exhaust vents are used to discharge the flue gas into the filter box. Each exhaust vent corresponds to a cooling chamber.

[0011] A first sealing block is provided on the upper surface of the cooling chamber, which is used to seal the gap between the cooling chamber and the top of the filter box. A second sealing block is provided on the lower surface of the cooling chamber, which is used to seal the gap between the cooling chamber and the first filter plate, so that the flue gas can only flow through the first filter plate into the second filter assembly. Positioning frames are provided at both ends of the cooling chamber, which are used to connect and fix the cooling chamber to the side wall inside the filter box.

[0012] The first filter assembly includes a first filter plate connected to the lower surface of the second sealing block. The first filter plate is used for primary filtration and purification of flue gas in the duct. A first positioning frame is provided on both sides of the first filter plate. The first positioning frame is used to connect and fix the first filter plate to the inner wall of the filter box. The second filter assembly includes a second filter plate connected to the inner wall of the filter box. The second filter plate is used for secondary filtration and purification of flue gas in the duct. The second filter plate is vertically erected from top to bottom. A second positioning frame is provided on both sides of the second filter plate. The second positioning frame is used to connect and fix the second filter plate to the inner wall of the filter box.

[0013] One end of the cooling chamber is connected to a liquid inlet pipe through the side wall of the filter box. The liquid inlet pipe is used to supply coolant to the cooling chamber. The bottom of the other side of the cooling chamber is connected to a liquid outlet pipe through the side wall of the filter box. The liquid outlet pipe is used to discharge the exhausted coolant in the cooling chamber. A temperature sensor is installed at the top of the liquid outlet pipe. The temperature sensor extends into the interior of the cooling chamber and is used to detect the temperature of the coolant in the cooling chamber.

[0014] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0015] 1. High-temperature flue gas enters the heat exchange water tank through the exhaust pipe, where heat exchange reduces the temperature of the flue gas. The cooled flue gas then enters the filter box through the purification duct, where the cooling chamber further cools the flue gas. The flue gas is then diverted and filtered once by the first filter component, then twice by the second filter component, and finally three times by the filter cotton plate before being discharged into the air, thus achieving the effect of protecting the environment.

[0016] 2. Pipe clamps are used to connect and fix the serpentine pipe to the inner wall of the heat exchange water tank, thereby preventing the serpentine pipe from shaking excessively during ventilation and ensuring the stability of the serpentine pipe during operation.

[0017] 3. The exhaust chamber is equipped with multiple exhaust vents to divert the flue gas in the purification duct, and then the exhaust vents are aligned with the cooling chamber, thereby further reducing the heat of the flue gas. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the main body of this utility model;

[0020] Figure 3 This is a side sectional view of the present invention;

[0021] Figure 4 This is a side sectional view of the present invention;

[0022] Figure 5 This is a side sectional view of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 100, Gas-fired hot water boiler; 101, Flue gas duct; 200, Heat exchange water tank; 201, Serpentine pipe; 202, Purification air duct; 203, Pipe clamp; 204, Irregular connector; 205, Water inlet; 206, Water outlet; 300, Filter box; 301, First filter assembly; 302, Second filter assembly; 303, Filter cotton plate; 304, Exhaust chamber; 305, Exhaust vent; 306, First filter plate; 307, First positioning frame; 308, Second positioning frame; 309, Second filter plate; 400, Cooling chamber; 401, First sealing block; 402, Second sealing block; 403, Positioning frame; 404, Liquid inlet; 405, Liquid outlet; 406, Temperature sensor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-5 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0025] like Figure 1-5 As shown: This embodiment provides a boiler waste heat recovery device, including a flue gas pipe 101 installed at the flue gas outlet of a gas-fired hot water boiler 100. The flue gas pipe 101 and the gas-fired hot water boiler 100 can be connected by a flange seal or welding. A heat exchange water tank 200 is connected to the air outlet end of the flue gas pipe 101. The heat exchange water tank 200 is used to absorb the heat of the flue gas flowing in the serpentine pipe 201, turning cold water into hot water and thus improving resource utilization. A serpentine pipe is installed inside the heat exchange water tank 201. The serpentine duct 201 is used to circulate high-temperature flue gas. It also serves to introduce the flue gas from the exhaust duct 101 into the purification duct 202. The outlet end of the serpentine duct 201 passes through the heat exchange water tank 200 and is connected to the purification duct 202. The purification duct 202 connects the serpentine duct 201 to the filter housing 300. A valve can be installed on the purification duct 202. One end of the purification duct 202 is welded to or flanged to the serpentine duct 201. The other end of the purification duct 202... The outlet end of the purification duct 202 is connected to the filter housing 300 by welding or flange. The filter housing 300 is used to filter and purify the flue gas after heat exchange, thereby preventing excessive pollution. A cooling chamber 400 is located on the top side of the filter housing 300, near the purification duct 202. The cooling chamber 400 can be filled with coolant or cold water and is used to further cool the end flue gas. The lower part is provided with a first filter assembly 301, which is used for the first filtration of the terminal flue gas. Multiple second filter assemblies 302 are provided on the side of the cooling chamber 400 away from the purification duct 202, which are used for the second filtration of the terminal flue gas. A filter cotton plate 303 is detachably provided on the air outlet side of the filter box 300, which is used for the third filtration of the terminal flue gas, and finally discharged into the air, thereby achieving the effect of protecting the environment.

[0026] In use, high-temperature flue gas enters the heat exchange water tank 200 through the exhaust pipe 101. The temperature of the flue gas is reduced through heat exchange, and then the cooled flue gas enters the filter box 300 through the purification air duct 202. The flue gas at the end is further cooled by the cooling chamber 400 in the filter box 300. The flue gas is then diverted to pass through the first filter component 301 for primary filtration, then through the second filter component 302 for secondary filtration, and then through the filter cotton plate 303 for tertiary filtration before finally being discharged into the air, thereby achieving the effect of protecting the environment.

[0027] This embodiment provides a boiler waste heat recovery device.

[0028] like Figure 1 , 2 As shown in Figures 3 and 4: Each U-shaped section of the serpentine pipe 201 is equipped with a pipe clamp 203. The pipe clamp 203 can be a U-shaped clamp. The bottom of the serpentine pipe 201 is bolted to the bottom wall of the heat exchange water tank 200 via multiple pipe clamps 203, and the top of the serpentine pipe 201 is bolted to the top wall of the heat exchange water tank 200 via multiple pipe clamps 203. The pipe clamps 203 are used to connect and fix the serpentine pipe 201 to the inner wall of the heat exchange water tank 200, thereby preventing the serpentine pipe 201 from generating airflow during ventilation. With significant shaking, each pipe clamp 203 is connected to the inner wall of the heat exchange water tank 200. The air inlet end of the serpentine pipe 201 is provided with a special-shaped connector 204. The special-shaped connector 204 and the serpentine pipe 201 can be connected by welding. The special-shaped connector 204 is used to connect the serpentine pipe 201 to the smoke exhaust pipe 101. The special-shaped connector 204 and the smoke exhaust pipe 101 can be sealed together by a ventilation flange. The air inlet end of the special-shaped connector 204 passes through the heat exchange water tank 200 and connects to the air outlet end of the smoke exhaust pipe 101.

[0029] Its effect is as follows: the pipe clamp 203 is used to connect and fix the serpentine pipe 201 to the inner wall of the heat exchange water tank 200, thereby preventing the serpentine pipe 201 from shaking too much during ventilation, and thus ensuring the stability of the serpentine pipe 201 during operation.

[0030] like Figure 1 , 2As shown in Figures 3 and 4: A water inlet 205 is connected to one side wall of the heat exchange water tank 200. The water inlet 205 is welded to the heat exchange water tank 200. A flange is provided at the water inlet end of the water inlet 205. The water inlet 205 is used to supply cold water to the heat exchange water tank 200. A water outlet 206 is connected to the other side wall of the heat exchange water tank 200. The water outlet 206 is welded to the heat exchange water tank 200. A flange is provided at the water outlet end of the water outlet 206. The water outlet 206 is used to discharge the cold water after absorbing the heat of the flue gas. The area inside the heat exchange water tank 200 excluding the serpentine pipe 201 is set as a water storage chamber. The water storage chamber is used to store liquid inside the heat exchange water tank 200.

[0031] Its effect is as follows: the inlet 205 is used to supply cold water to the heat exchange water tank 200, thereby absorbing the heat of the flue gas in the serpentine pipe 201 through the cold water to achieve the heat exchange effect; the outlet 206 is used to discharge the cold water after absorbing the heat of the flue gas, thereby allowing hot water to be discharged from the outlet 206.

[0032] like Figure 2 , 3 As shown in Figures 4 and 5: An exhaust chamber 304 is provided where the purification duct 202 passes through the filter box 300. The exhaust chamber 304 is square and is welded to the purification duct 202. The exhaust chamber 304 is used to divert the air in the purification duct 202, thereby further reducing the heat of the flue gas. Multiple exhaust ports 305 are provided on the side of the multiple exhaust chambers 304 away from the purification duct 202. The exhaust ports 305 are used to discharge the flue gas into the filter box 300. Each exhaust port 305 corresponds to the cooling chamber 400.

[0033] Its effect is as follows: the exhaust chamber 304, equipped with multiple exhaust vents 305, is used to divert the flue gas in the purification duct 202, and then make the exhaust vents correspond to the cooling chamber 400, thereby further reducing the heat of the flue gas.

[0034] like Figure 1 , 2As shown in Figures 3 and 4: A first sealing block 401 is provided on the upper surface of the cooling chamber 400. The first sealing block 401 is trapezoidal, and its lower surface can be welded to the upper surface of the cooling chamber 400. The first sealing block 401 is used to seal the gap between the cooling chamber 400 and the top of the filter box 300. The upper surface of the first sealing block 401 is welded to the inner top of the filter box 300. A second sealing block 402 is provided on the lower surface of the cooling chamber 400. The upper part of the second sealing block 402 is welded to the lower part of the cooling chamber 400. The lower surface of the second sealing block 402 and the first filter plate 306 can be sealed and connected by a gasket and bolts. Alternatively, a sealing connection can be established. The second sealing block 402 is used to seal the gap between the cooling chamber 400 and the first filter plate 306, so that the flue gas can only flow through the first filter plate 306 into the second filter assembly 302. Both ends of the cooling chamber 400 are provided with positioning frames 403. The positioning frames 403 are square in shape. The inner ring of the positioning frame 403 is adapted to the end face of the cooling chamber 400. The positioning frame 403 and the cooling chamber 400 can be welded and fixed. The positioning frame 403 and the side wall of the filter box 300 can be fixed by bolts. The positioning frame 403 is used to connect and fix the cooling chamber 400 to the side wall inside the filter box 300.

[0035] Its effect is as follows: the first sealing block 401 is used to seal the gap between the cooling chamber 400 and the top of the filter box 300, thereby preventing flue gas from drifting into the second filter assembly 302 from above; the second sealing block 402 is used to seal the gap between the cooling chamber 400 and the first filter plate 306, thereby guiding the flue gas so that it can only enter the second filter assembly 302 through the first filter assembly 301.

[0036] like Figure 1 , 2As shown in Figure 3: The first filter assembly 301 includes a first filter plate 306 connected to the lower surface of the second sealing block 402. The first filter plate 306 is shorter than the second filter plate 309. Both sides of the first filter plate 306 are connected and fixed to the inner wall of the filter housing 300 by first positioning brackets 307 and bolts. The first filter plate 306 is used for primary filtration and purification of flue gas in the air duct 202. A first positioning bracket 307 is provided on both sides of the first filter plate 306. The first positioning bracket 307 is used to connect and fix the first filter plate 306 to the inner wall of the filter housing 300. Each second filter plate 309... The filter assembly 302 includes a second filter plate 309 connected to the inner wall of the filter housing 300. The two sides of the second filter plate 309 are connected and fixed to the inner wall of the filter housing 300 by bolts through second positioning brackets 308. The second filter plate 309 is used for secondary filtration and purification of flue gas in the air duct 202. The second filter plate 309 is vertically erected from top to bottom. A second positioning bracket 308 is provided on both sides of the second filter plate 309. The first positioning bracket 307 is shorter than the second positioning bracket 308. The second positioning bracket 308 is used to connect and fix the second filter plate 309 to the inner wall of the filter housing 300.

[0037] Its effect is as follows: the first positioning frame 307 is used to connect and fix the first filter plate 306 to the inner wall of the filter box 300, thereby supporting the cooling chamber 400.

[0038] like Figure 1 , 3 As shown in Figure 4: One end of the cooling chamber 400 passes through the side wall of the filter box 300 and is connected to a liquid inlet 404. The liquid inlet 404 is welded to the cooling chamber 400. A valve is provided at the liquid inlet end of the liquid inlet 404. The liquid inlet 404 is used to supply coolant or other liquids for reducing the temperature of flue gas to the cooling chamber 400. The other bottom side of the cooling chamber 400 passes through the side wall of the filter box 300 and is connected to a liquid outlet 405. The liquid outlet 405 is connected to the cooling chamber 400. The outlet pipe 405 is welded and connected. A valve is provided at the outlet end of the outlet pipe 405. Preferably, the inlet pipe 404 is higher than the outlet pipe 405. The outlet pipe 405 is used to discharge the failed coolant in the cooling chamber 400. A temperature sensor 406 is provided on the upper part of the outlet pipe 405. The temperature sensor 406 is connected to the cooling chamber 400 by a thread. The probe of the temperature sensor 406 extends into the cooling chamber 400. The temperature sensor 406 is used to detect the temperature of the coolant in the cooling chamber 400.

[0039] Its function is as follows: the inlet pipe 404 is used to supply coolant or other liquids for reducing the temperature of flue gas to the cooling chamber 400, thereby further cooling the flue gas; the temperature sensor 406 is used to detect the temperature of the coolant in the cooling chamber 400; and the outlet pipe 405 is used to discharge the failed coolant in the cooling chamber 400.

[0040] Working principle: High-temperature flue gas enters the heat exchange water tank 200 through the exhaust pipe 101. The cold water absorbs the heat of the flue gas in the serpentine pipe 201, thereby achieving heat exchange and reducing the temperature of the flue gas. The cooled flue gas then enters the filter box 300 through the purification air duct 202. The flue gas is then diverted and blown onto the surface of the cooling chamber 400 through the exhaust chamber 304 and exhaust port 305 in the filter box 300. This further cools the flue gas at the end of the cooling chamber 400. The flue gas is then diverted and guided to pass through the first filter component 301 for primary filtration, the second filter component 302 for secondary filtration, and the filter cotton plate 303 for tertiary filtration before finally being discharged into the air, thereby achieving the effect of protecting the environment.

[0041] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A boiler waste heat recovery device, comprising a flue gas duct (101) arranged at a flue gas outlet of a gas-fired water boiler (100), characterized in that: The air outlet end of the smoke exhaust duct (101) is communicated with a heat exchange water tank (200), the heat exchange water tank (200) is provided with a serpentine duct (201), the air outlet end of the serpentine duct (201) is provided with a purification air pipe (202) penetrating through the heat exchange water tank (200), the air outlet end of the purification air pipe (202) is provided with a filter box (300), the filter box (300) is provided with a cooling bin (400) on the top side close to the purification air pipe (202), the lower part of the cooling bin (400) is provided with a first filter assembly (301), the side of the cooling bin (400) away from the purification air pipe (202) is provided with a plurality of second filter assemblies (302), and the air outlet side of the filter box (300) is detachably provided with a filter cotton plate (303).

2. A boiler heat recovery device as claimed in claim 1, characterised in that: Each U-shaped section of the serpentine duct (201) is provided with a pipe clamp (203), and each pipe clamp (203) is connected with the inner wall of the heat exchange water tank (200).

3. A boiler heat recovery apparatus as claimed in claim 2, wherein: The air inlet end of the serpentine duct (201) is provided with a special-shaped connecting piece (204), and the air inlet end of the special-shaped connecting piece (204) penetrates through the heat exchange water tank (200) and is communicated with the air outlet end of the smoke exhaust duct (101).

4. A boiler heat recovery apparatus as claimed in claim 3, wherein: The side wall of one side of the heat exchange water tank (200) is communicated with a water inlet pipe (205), and the side wall of the other side of the heat exchange water tank (200) is communicated with a water outlet pipe (206).

5. A boiler heat recovery apparatus as claimed in claim 4, characterised in that: The purification air pipe (202) is provided with a plurality of air exhaust chambers (304) penetrating through the filter box (300), the side of the plurality of air exhaust chambers (304) away from the purification air pipe (202) is provided with a plurality of air exhaust openings (305), and each air exhaust opening (305) corresponds to the cooling bin (400).

6. A boiler heat recovery apparatus as claimed in claim 5, characterised in that: The upper surface of the cooling bin (400) is provided with a first sealing block (401), the lower surface of the cooling bin (400) is provided with a second sealing block (402), and the two ends of the cooling bin (400) are provided with positioning frames (403).

7. A boiler heat recovery apparatus as claimed in claim 6, characterised in that: The first filter assembly (301) comprises a first filter plate (306) connected with the lower surface of the second sealing block (402), and the two sides of the first filter plate (306) are provided with a first positioning frame (307); each second filter assembly (302) comprises a second filter plate (309) connected with the inner wall of the filter box (300), and the second filter plate (309) is vertically arranged from top to bottom; and the two sides of the second filter plate (309) are provided with a second positioning frame (308).

8. A boiler heat recovery apparatus as claimed in claim 7, characterised in that: One end of the cooling bin (400) is communicated with a liquid inlet pipe (404) penetrating through the side wall of the filter box (300), the other side of the cooling bin (400) is communicated with a liquid outlet pipe (405) penetrating through the side wall of the filter box (300) at the bottom, and the upper part of the liquid outlet pipe (405) is provided with a temperature sensor (406).

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