A gas-fired boiler flue gas waste heat recovery device

Abstract

The utility model relates to the technical field of waste heat recovery, especially to a gas boiler flue gas waste heat recovery device, which can agitate water, make water and flue gas heat evenly, increase flue gas flow distance and improve heat exchange effect, comprising a heat exchange cylinder, an air inlet filter assembly, a water supply component, a heat exchange component and an agitation component, the air inlet filter assembly is installed at the bottom input end of the heat exchange cylinder, the water supply component is installed outside the heat exchange cylinder, the heat exchange component is installed inside the heat exchange cylinder, the input end of the heat exchange component is connected with the output end of the water supply component, and the agitation component is installed inside the heat exchange cylinder.

Description

Technical Field

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

[0002] A gas-fired boiler is a device that uses gas to heat a contained liquid to certain parameters and outputs heat energy. Gas-fired boilers include gas-fired hot water boilers, gas-fired hot water boilers, and gas-fired steam boilers. Gas-fired hot water boilers are also called gas-fired heating boilers and gas-fired bathing boilers. As the name suggests, gas-fired boilers use gas as fuel. Compared to oil-fired boilers and electric boilers, gas-fired boilers are the most economical, so most people choose them for steam, heating, and bathing purposes. Gas-fired boilers generally recover residual heat during operation. Existing technology publication number CN219433810U discloses a waste heat recovery device for flue gas from a gas-fired boiler, comprising a first filter element, an ash scraper, a limiting baffle, a pull ring, a fixing block, an ash collection bin, a tightening handle, a second filter element, and a sealing gasket. The ash collection bin is mounted on the lower side of the flue gas connecting pipe, and a tightening handle is provided on the lower surface of the ash collection bin. The second filter element is mounted on the upper side of the ash collection bin, and a sealing gasket is mounted on the upper surface of the second filter element. The first filter element is mounted on the upper side of the sealing gasket, and a fixing block is mounted on the upper side of the first filter element. A pull ring is mounted on the upper side of the fixing block, and an ash scraper is provided on the left side of the fixing block. A limiting baffle is mounted on the left side of the ash scraper. However, when the water in the water tank remains stationary, the water near the flue gas circulation pipe heats up quickly, while the water at the edges heats up slowly, affecting the heat exchange efficiency and reducing the waste heat recovery efficiency. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a waste heat recovery device for gas-fired boilers that can agitate water to achieve uniform heat exchange between water and flue gas, increase the flow distance of flue gas, and improve the heat exchange effect.

[0004] This utility model discloses a waste heat recovery device for flue gas from a gas-fired boiler, comprising a heat exchange cylinder, an air inlet filter assembly, a water supply component, a heat exchange component, and an agitator. The air inlet filter assembly is installed at the bottom input end of the heat exchange cylinder, and the water supply component is installed outside the heat exchange cylinder. The heat exchange component is installed inside the heat exchange cylinder, with its input end connected to the output end of the water supply component. The agitator is installed inside the heat exchange cylinder. The air inlet filter assembly is connected to the boiler's flue gas pipe, and the flue gas is filtered by the air inlet filter assembly before entering the heat exchange component. The water supply component supplies water into the heat exchange cylinder, and the water exchanges heat with the heat exchange component to recover and utilize the waste heat. The agitator agitates the water, ensuring uniform heating, guaranteeing heat exchange quality, and improving heat exchange efficiency.

[0005] Preferably, the air intake filtration assembly includes a filter cylinder, an air intake pipe, and a filter screen. The filter cylinder is installed at the bottom air intake end of the heat exchange cylinder, the filter screen is installed inside the filter cylinder, and the air intake pipe is installed at the bottom of the filter cylinder by bolts. The air intake pipe is connected to the flue gas pipe of the boiler, and the flue gas is input through the air intake pipe and filtered by the filter screen to prevent particulate matter in the flue gas from scaling inside the heat exchange cylinder.

[0006] Preferably, the heat exchange component includes an exhaust pipe, an air filter, multiple heat exchange plates, and multiple sets of heat exchange tubes. The input end of the heat exchange plate is connected to the output end of the filter cylinder. Multiple heat exchange tubes are connected to the top of the heat exchange plate. Adjacent heat exchange plates are connected through multiple sets of heat exchange tubes. The output end of the top heat exchange plate is connected to the input end of the exhaust pipe. The exhaust pipe is installed on the top of the heat exchange cylinder, and an air filter is installed on the exhaust pipe. Flue gas enters the heat exchange plate and flows between the multiple heat exchange plates through multiple heat exchange tubes, increasing the flow distance of the flue gas and improving the heat exchange effect. The flue gas after heat exchange is discharged through the exhaust pipe and further filtered by the air filter to reduce air pollution.

[0007] Preferably, the water supply component includes a fixing ring, multiple screws, a water tank, a water inlet head, a water supply pipe, and a water pump. The fixing ring is installed on the outer wall of the heat exchange cylinder, the water tank is located below the fixing ring, the top of the water tank is connected to the fixing ring by bolts, the water inlet head is installed on the upper left side of the water tank, the output end of the water supply pipe is connected to the input end at the bottom of the heat exchange cylinder, the water pump is installed on the water supply pipe, and the input end of the water supply pipe is connected to the output end of the water tank. Water is supplied to the water tank through the water inlet head, and the water pump is started to draw water through the water supply pipe and then input into the heat exchange cylinder to ensure the continuity of heat exchange.

[0008] Preferably, the agitating component includes a circular ring, a supporting rotating ring, a rotating ring, multiple vertical plates, a bevel gear ring, a bevel gear, and a drive motor. The circular ring is installed at the top inside the heat exchange cylinder, and a lifting groove is opened at the bottom of the circular ring. The supporting rotating ring is rotatably installed in the lifting groove, and a rotating ring is installed at the bottom of the supporting rotating ring. Multiple vertical plates are axially and evenly installed at the bottom of the rotating ring, and the bottom of the vertical plates are connected to the bevel gear ring. The drive motor is installed at the bottom of the heat exchange cylinder, and the output end of the drive motor passes through the bottom of the heat exchange cylinder and is equipped with a bevel gear, which meshes with the bevel gear ring. When the drive motor is started, it drives the bevel gear to rotate, which in turn drives the bevel gear ring to rotate. The bevel gear ring drives the multiple vertical plates to rotate inside the heat exchange cylinder, agitating the water and ensuring uniform heat exchange between the water and the flue gas, thus guaranteeing heat exchange quality and improving heat exchange efficiency.

[0009] Preferably, it also includes a water outlet pipe, a thermometer, and a valve. The water outlet pipe is installed at the top of the heat exchange cylinder, and a valve is installed on the water outlet pipe. A thermometer is installed on the left side of the top of the heat exchange cylinder, and the detection end of the thermometer is located inside the heat exchange cylinder. The output end of the water outlet pipe is connected to the boiler water pipe. After the water inside the heat exchange cylinder is preheated, the water temperature is detected by the thermometer. The valve is opened and the preheated water is input into the boiler through the water outlet pipe to achieve the purpose of energy saving and consumption reduction.

[0010] Preferably, it also includes an insulation layer, which is fitted onto the outer wall of the heat exchange cylinder; the insulation layer can keep the inside of the heat exchange cylinder warm, reduce heat loss, and improve heat utilization.

[0011] Preferably, it also includes multiple sets of stirring rods, with multiple stirring rods evenly installed on the inner wall of the vertical plate, and multiple round holes opened on the vertical plate; when the vertical plate rotates, it drives multiple stirring rods to rotate, stirring the inside of the heat exchange cylinder. The round holes and stirring rods improve the stirring and mitigation effect on the water, ensuring uniform heating of the water.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: the air intake filter assembly is connected to the flue gas pipe of the boiler, the flue gas is filtered by the air intake filter assembly, the flue gas enters the heat exchange component, the water supply component inputs water into the heat exchange cylinder, the heat exchange component exchanges heat with the water, the waste heat is recovered and utilized, the stirring component can stir the water to ensure uniform heating of the water, ensure heat exchange quality, and improve heat exchange efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the isometric structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the lower three-dimensional structure of this utility model;

[0016] Figure 4 This is a front cross-sectional structural diagram of the present invention;

[0017] Figure 5 This is a schematic diagram of the internal structure of this utility model;

[0018] The following are labels in the attached diagram: 1. Heat exchange cylinder; 2. Filter cylinder; 3. Air inlet pipe; 4. Filter screen; 5. Air outlet pipe; 6. Air filter; 7. Heat exchange plate; 8. Heat exchange tube; 9. Fixing ring; 10. Screw; 11. Water tank; 12. Water inlet head; 13. Water supply pipe; 14. Water pump; 15. Circular ring; 16. Supporting rotating ring; 17. Rotating ring; 18. Vertical plate; 19. Bevel gear ring; 20. Bevel gear; 21. Drive motor; 22. Stirring rod; 23. Insulation layer; 24. Water outlet pipe; 25. Thermometer; 26. Valve. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0020] like Figures 1 to 5As shown, filter cartridge 2 is installed at the bottom air inlet of heat exchange cartridge 1, filter screen 4 is installed inside filter cartridge 2, air inlet pipe 3 is installed at the bottom of filter cartridge 2 by bolts, the input end of heat exchange plate 7 is connected to the output end of filter cartridge 2, multiple heat exchange tubes 8 are connected to the top of heat exchange plate 7, and adjacent heat exchange plates 7 are connected by multiple sets of heat exchange tubes 8, the output end of the top heat exchange plate 7 is connected to the input end of air outlet pipe 5, air outlet pipe 5 is installed at the top of heat exchange cartridge 1, air filter 6 is installed on air outlet pipe 5, fixing ring 9 is installed on the outer wall of heat exchange cartridge 1, water tank 11 is located below fixing ring 9, the top of water tank 11 is connected to fixing ring 9 by bolts, water inlet head 12 is installed on the upper left side of water tank 11, the output end of water inlet pipe 13 is connected to the bottom input end of heat exchange cartridge 1, water pump 14 is installed on water inlet pipe 13, and the input end of water inlet pipe 13 is connected to the output end of water tank 11. The heat exchange cylinder 1 is connected to the outlet end. The ring 15 is installed at the top inside the heat exchange cylinder 1. The bottom of the ring 15 is provided with a hoisting groove. The supporting rotating ring 16 is rotatably installed in the hoisting groove. The bottom of the supporting rotating ring 16 is provided with a rotating ring 17. Multiple vertical plates 18 are evenly installed axially at the bottom of the rotating ring 17. The bottom of the vertical plates 18 is connected to the bevel gear ring 19. Multiple stirring rods 22 are evenly installed on the inner wall of the vertical plates 18. Multiple round holes are provided on the vertical plates 18. The drive motor 21 is installed at the bottom of the heat exchange cylinder 1. The output end of the drive motor 21 passes through the bottom of the heat exchange cylinder 1 and is provided with a bevel gear 20. The bevel gear 20 meshes with the bevel gear ring 19. The water outlet pipe 24 is installed at the top of the heat exchange cylinder 1. A valve 26 is installed on the water outlet pipe 24. A thermometer 25 is installed on the top left side of the heat exchange cylinder 1. The detection end of the thermometer 25 is located inside the heat exchange cylinder 1. The insulation layer 23 is fitted on the outer wall of the heat exchange cylinder 1.The inlet pipe 3 is connected to the boiler's flue gas pipe. Flue gas enters through the inlet pipe 3 and is filtered by the filter screen 4 to prevent particulate matter from scaling inside the heat exchange cylinder 1. The flue gas enters the heat exchange plate 7 and flows between multiple heat exchange plates 7 through multiple heat exchange tubes 8, increasing the flow distance of the flue gas and improving the heat exchange effect. The flue gas after heat exchange is discharged through the outlet pipe 5 and further filtered by the air filter 6 to reduce air pollution. Water is supplied to the water tank 11 through the water inlet head 12. The water pump 14 is started to draw water through the water inlet pipe 13 and then input it into the heat exchange cylinder 1 to ensure the continuity of heat exchange. The drive motor 21 is started to drive the bevel gear 20 to rotate, and the bevel gear 20 drives the bevel gear ring 19 to rotate. The conical ring 19 drives multiple vertical plates 18 to rotate inside the heat exchange cylinder 1, agitating the water and ensuring uniform heat exchange between the water and flue gas, thus guaranteeing heat exchange quality and improving heat exchange efficiency. The rotation of the vertical plates 18 also drives multiple stirring rods 22 to rotate, further agitating the interior of the heat exchange cylinder 1. The round holes and stirring rods 22 enhance the agitation of the water, ensuring uniform heating. The outlet pipe 24 is connected to the boiler water pipe. After preheating, the water temperature inside the heat exchange cylinder 1 is monitored by a thermometer 25. The valve 26 is then opened to allow the preheated water to be fed into the boiler through the outlet pipe 24, achieving energy saving and consumption reduction. The insulation layer 23 insulates the interior of the heat exchange cylinder 1, reducing heat loss and improving heat utilization.

[0021] like Figures 1 to 5 As shown, this utility model discloses a waste heat recovery device for flue gas from a gas-fired boiler. During operation, the inlet pipe 3 is connected to the boiler's flue gas pipe, allowing flue gas to enter through the inlet pipe 3. The flue gas is filtered through a filter screen 4 to prevent particulate matter from forming scale inside the heat exchange cylinder 1. The flue gas then enters the heat exchange plates 7 and flows between multiple heat exchange plates 7 via multiple heat exchange tubes 8, increasing the flue gas flow distance. After heat exchange, the flue gas is discharged through the outlet pipe 5 and further filtered by an air filter 6. Water is supplied to the water tank 11 through the water inlet head 12, and the water pump 14 is activated to draw water through the water inlet pipe 13, which is then fed into the heat exchange cylinder 1. The drive motor 21 is started, which drives the bevel gear 20 to rotate. The bevel gear 20 drives the bevel ring 19 to rotate, and the bevel ring 19 drives multiple vertical plates 18 to rotate inside the heat exchange cylinder 1, agitating the water and making the water and flue gas exchange heat evenly. When the vertical plates 18 rotate, they drive multiple stirring rods 22 to rotate, agitating the inside of the heat exchange cylinder 1. The round hole and stirring rods 22 improve the agitation effect on the water. The output end of the water outlet pipe 24 is connected to the boiler water pipe. After the water inside the heat exchange cylinder 1 is preheated, the water temperature is detected by the thermometer 25. The valve 26 is opened and the preheated water is input into the boiler through the water outlet pipe 24 to achieve the purpose of energy saving and consumption reduction.

[0022] The filter screen 4, air filter 6, drive motor 21, and thermometer 25 of the waste heat recovery device for flue gas from a gas boiler of this utility model are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A waste heat recovery device for flue gas from a gas-fired boiler, characterized in that, It includes a heat exchange cylinder (1), an air intake filter assembly, a water supply component, a heat exchange component, and a stirring component. The air intake filter assembly is installed at the bottom input end of the heat exchange cylinder (1). The water supply component is installed outside the heat exchange cylinder (1). The heat exchange component is installed inside the heat exchange cylinder (1). The input end of the heat exchange component is connected to the output end of the water supply component. The stirring component is installed inside the heat exchange cylinder (1).

2. The waste heat recovery device for flue gas from a gas-fired boiler as described in claim 1, characterized in that, The air intake filter assembly includes a filter cylinder (2), an air intake pipe (3), and a filter screen (4). The filter cylinder (2) is installed at the bottom air intake end of the heat exchange cylinder (1), the filter screen (4) is installed inside the filter cylinder (2), and the air intake pipe (3) is installed at the bottom of the filter cylinder (2) by bolts.

3. The waste heat recovery device for flue gas from a gas-fired boiler as described in claim 2, characterized in that, The heat exchange components include an air outlet pipe (5), an air filter (6), multiple heat exchange plates (7) and multiple sets of heat exchange tubes (8). The input end of the heat exchange plate (7) is connected to the output end of the filter cylinder (2). Multiple heat exchange tubes (8) are connected to the top of the heat exchange plate (7). Adjacent heat exchange plates (7) are connected to each other through multiple sets of heat exchange tubes (8). The output end of the top heat exchange plate (7) is connected to the input end of the air outlet pipe (5). The air outlet pipe (5) is installed on the top of the heat exchange cylinder (1), and an air filter (6) is installed on the air outlet pipe (5).

4. The waste heat recovery device for flue gas from a gas-fired boiler as described in claim 1, characterized in that, The water supply components include a fixing ring (9), multiple screws (10), a water tank (11), a water inlet head (12), a water inlet pipe (13), and a water pump (14). The fixing ring (9) is installed on the outer wall of the heat exchange cylinder (1). The water tank (11) is located below the fixing ring (9). The top of the water tank (11) is connected to the fixing ring (9) by bolts. A water inlet head (12) is installed on the upper left side of the water tank (11). The output end of the water inlet pipe (13) is connected to the input end at the bottom of the heat exchange cylinder (1). A water pump (14) is installed on the water inlet pipe (13). The input end of the water inlet pipe (13) is connected to the output end of the water tank (11).

5. The waste heat recovery device for flue gas from a gas-fired boiler as described in claim 1, characterized in that, The stirring components include a circular ring (15), a supporting rotating ring (16), a rotating ring (17), multiple vertical plates (18), a bevel ring (19), a bevel gear (20), and a drive motor (21). The circular ring (15) is installed at the top inside the heat exchange cylinder (1). A hoisting groove is provided at the bottom of the circular ring (15). The supporting rotating ring (16) is rotatably installed in the hoisting groove. The rotating ring (17) is installed at the bottom of the supporting rotating ring (16). Multiple vertical plates (18) are evenly installed axially at the bottom of the rotating ring (17). The bottom of the vertical plates (18) is connected to the bevel ring (19). The drive motor (21) is installed at the bottom of the heat exchange cylinder (1). The output end of the drive motor (21) passes through the bottom of the heat exchange cylinder (1) and is installed with a bevel gear (20). The bevel gear (20) meshes with the bevel ring (19).

6. The waste heat recovery device for flue gas from a gas-fired boiler as described in claim 1, characterized in that, It also includes a water outlet pipe (24), a thermometer (25) and a valve (26). The water outlet pipe (24) is installed at the top of the heat exchange cylinder (1), and a valve (26) is installed on the water outlet pipe (24). A thermometer (25) is installed on the left side of the top of the heat exchange cylinder (1), and the detection end of the thermometer (25) is located inside the heat exchange cylinder (1).

7. The waste heat recovery device for flue gas from a gas-fired boiler as described in claim 1, characterized in that, It also includes a heat insulation layer (23), which is fitted onto the outer wall of the heat exchange cylinder (1).

8. The waste heat recovery device for flue gas from a gas-fired boiler as described in claim 5, characterized in that, It also includes multiple sets of stirring rods (22), and multiple stirring rods (22) are evenly installed on the inner wall of the vertical plate (18), and multiple round holes are opened on the vertical plate (18).

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