Boiler flue gas waste heat utilization equipment

Abstract

The utility model relates to the technical field of boilers, and discloses boiler flue gas waste heat utilization equipment which comprises a water storage tank, one end of the side wall of the water storage tank is fixedly connected with a filter box, a filter screen is arranged in the filter box, an air inlet pipe is arranged at the bottom of the filter box, and an air guide pipe is arranged at the top of the filter box. One end of the air guide pipe extends into the water storage tank and communicates with a heat exchange pipe, the heat exchange pipe is arranged in a zigzag manner, a plurality of fins are fixedly connected to the surface of the heat exchange pipe, the end, away from the air guide pipe, of the heat exchange pipe communicates with an exhaust pipe, one end of the exhaust pipe extends out of the water storage tank, and a water inlet pipe is arranged at one end of the top of the water storage tank; a drain pipe is arranged at the bottom of the water storage tank; according to the utility model, the heat exchange tube is arranged in the water storage tank, so that water in the water storage tank can be heated, waste heat in flue gas is fully utilized to heat the water in the water storage tank, and efficient recovery of energy is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to boiler flue gas waste heat utilization equipment. Background Art

[0002] Boilers are important equipment in industrial production, heating, and power generation. During use, they generate a large amount of flue gas, which contains a large amount of waste heat. If this waste heat is not effectively recovered and utilized, it will directly lead to energy waste and environmental pollution.

[0003] A search revealed a Chinese patent with publication number CN115264511A, which discloses a boiler flue gas waste heat utilization device. The device comprises a waste heat utilization housing, a motor fixedly mounted on the top of the waste heat utilization housing, the bottom end of the motor output shaft extending into the waste heat utilization housing, and an isolation plate fixedly mounted on the inner wall of the waste heat utilization housing. The beneficial effects of the present invention are as follows: by passing flue gas into the waste heat utilization housing, pebbles are first heated, and then clean water is added to the pebbles to heat the clean water, thereby achieving secondary utilization of the flue gas. The exhaust pipe and filter screen can then be disassembled and cleaned by pushing a push ring, thereby increasing filtration efficiency.

[0004] Although the above technology has achieved the recycling of flue gas waste heat to a certain extent, it also has some potential defects. The flue gas first heats the pebbles, and the pebbles then heat the clean water. There are two heat transfers in this process. Each heat transfer will have a certain amount of heat loss, such as heat loss in thermal radiation and thermal convection, resulting in a decrease in the amount of heat ultimately transferred to the clean water and a decrease in overall thermal efficiency. The flue gas may contain harmful substances, such as sulfur oxides and nitrogen oxides, which are difficult to be completely filtered out by the filter. In the process of heating the pebbles, these harmful substances may adhere to the surface of the pebbles, which will affect the water quality when the clean water is heated.

[0005] Therefore, the utility model proposes a boiler flue gas waste heat utilization device. Utility Model Content

[0006] The purpose of the utility model is to provide a boiler flue gas waste heat utilization device to solve the problem that the boiler flue gas waste heat is inconvenient to recycle and utilize.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a boiler flue gas waste heat utilization device, comprising a water storage tank, a filter box fixedly connected to one end of the side wall of the water storage tank, a filter screen provided inside the filter box, an air inlet pipe provided at the bottom of the filter box, an air guide pipe provided at the top of the filter box, one end of the air guide pipe extending to the interior of the water storage tank and connected to a heat exchange pipe, a plurality of fins fixedly connected to the surface of the heat exchange pipe, the end of the heat exchange pipe away from the air guide pipe being connected to an exhaust pipe, one end of the exhaust pipe extending to the outside of the water storage tank, a water inlet pipe provided at one end of the top of the water storage tank, and a drain pipe provided at the bottom of the water storage tank.

[0008] Preferably, the bottom of the water storage tank is arranged in an inverted cone shape, four supporting legs are fixedly connected to the bottom of the water storage tank, and a valve is installed at one end of the drain pipe.

[0009] Preferably, one end of the top of the inner wall of the water storage tank is fixedly connected to a cylinder, and the output end of the cylinder is fixedly connected to a water pressure plate.

[0010] Preferably, a temperature sensor is fixedly connected to one end of the inner side wall of the water storage tank, and the temperature sensor and the cylinder are respectively located at both ends of the heat exchange tube.

[0011] Preferably, a mounting frame is slidably connected inside the filter box, the filter screen is fixedly connected to the middle of the mounting frame, and one end of the mounting frame extends to the outside of the filter box.

[0012] Preferably, a slide groove is provided at both ends of the interior of the filter box, and the slide groove is slidably connected to the installation frame. A through hole is provided at one end of the side wall of the filter box, and the through hole is movably plugged into the installation frame. A baffle is fixedly connected to one end of the installation frame, and a handle is fixedly connected to the middle of the baffle.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model filters the flue gas through a filter mesh, thereby filtering out particulate impurities in the flue gas, thereby preventing impurities from adhering to the inner wall of the heat exchange tube to form a barrier layer, thereby ensuring the heat exchange efficiency of the heat exchange tube. In addition, the surface area of ​​the heat exchange tube is increased by the design of the fins, thereby improving the heat exchange efficiency. By arranging the heat exchange tube in the water storage tank, the water in the water storage tank can be heated. This design makes full use of the waste heat in the flue gas to heat the water in the water storage tank, realizing efficient energy recovery. The cylinder design drives the water pressure plate to move up and down, thereby driving the water flow in the water storage tank to continuously roll and flow, forming more intense convection, so that the heat in the heat exchange tube can be transferred to the entire water body more quickly, thereby improving the heat exchange efficiency. Moreover, in a static water storage tank, due to the low density of hot water, it is easy to float up to form temperature stratification. This stratification phenomenon will lead to uneven heat distribution and reduce the heat exchange efficiency. The tumbling flow of water can break the temperature stratification, make the water temperature more uniform, and further improve the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the side cross-sectional structure of the water storage tank in the present utility model;

[0017] Figure 3 This is a schematic diagram of the side cross-sectional structure of the filter box in the present utility model;

[0018] Figure 4 This is a schematic diagram of the chute structure in the present utility model;

[0019] Figure 5 This is a schematic diagram of the through-hole structure in the present utility model.

[0020] In the figure: 1. Water storage tank; 2. Filter box; 3. Filter screen; 4. Air inlet pipe; 5. Air guide pipe; 6. Heat exchange tube; 7. Fin; 8. Exhaust pipe; 9. Water inlet pipe; 10. Drain pipe; 11. Support leg; 12. Valve; 13. Cylinder; 14. Water pressure plate; 15. Temperature sensor; 16. Mounting frame; 17. Slide groove; 18. Through hole; 19. Baffle; 20. Handle. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1-5The utility model provides a technical solution: a boiler flue gas waste heat utilization device, including a water storage tank 1, one end of the side wall of the water storage tank 1 is fixedly connected to a filter box 2, a filter screen 3 is arranged inside the filter box 2, an air inlet pipe 4 is arranged at the bottom of the filter box 2, an air guide pipe 5 is arranged on the top of the filter box 2, one end of the air guide pipe 5 extends to the inside of the water storage tank 1 and is connected with a heat exchange pipe 6, the heat exchange pipe 6 is arranged in a tortuous manner, and a plurality of fins 7 are fixedly connected to the surface of the heat exchange pipe 6, the end of the heat exchange pipe 6 away from the air guide pipe 5 is connected with an exhaust pipe 8, one end of the exhaust pipe 8 extends to the outside of the water storage tank 1, one end of the top of the water storage tank 1 is provided with a water inlet pipe 9, and the bottom of the water storage tank 1 is provided with a drain pipe 10; the bottom of the water storage tank 1 is arranged in an inverted cone shape, four supporting legs 11 are fixedly connected to the bottom of the water storage tank 1, and a valve 12 is installed at one end of the drain pipe 10;

[0023] In this embodiment, the flue gas generated by the boiler is first input into the filter box 2 through the air inlet pipe 4. The flue gas will first be filtered by the filter mesh 3 in the filter box 2, thereby filtering out the particulate impurities in the flue gas, thereby preventing the impurities in the flue gas from adhering to the inner wall of the heat exchange tube 6 to form a barrier layer, thereby ensuring the heat exchange efficiency of the heat exchange tube 6. After the flue gas passes through the filter mesh 3, it will enter the heat exchange tube 6 through the air guide pipe 5. At this time, the staff can inject water into the water storage tank 1 through the water inlet pipe 9, so that the waste heat in the flue gas will heat the water through the heat exchange tube 6, thereby realizing the recovery and utilization of the flue gas heat. It is set in a zigzag state, and a plurality of fins 7 are set on the surface of the heat exchange tube 6. This can increase the contact area between the heat exchange tube 6 and the water flow, thereby improving the heat exchange efficiency. The flue gas passing through the heat exchange tube 6 will be discharged through the exhaust pipe 8. Since the flue gas has been filtered by the filter 3, the emission of pollutants is reduced to a certain extent, and the environmental protection performance is improved. In actual operation, the flue gas discharged from the exhaust pipe 8 can be filtered and purified for the second time, so that the flue gas will not cause pollution when it is discharged into the environment. When the water flow in the water storage tank 1 is heated, the valve 12 on the drain pipe 10 can be opened to discharge the heated water flow.

[0024] like Figure 2 As shown, one end of the top of the inner wall of the water storage tank 1 is fixedly connected to a cylinder 13, and the output end of the cylinder 13 is fixedly connected to a water pressure plate 14;

[0025] In this embodiment, the design of the cylinder 13 is used to drive the water pressure plate 14 to move up and down, thereby driving the water flow in the water storage tank 1 to continuously roll and flow, forming a stronger convection, so that the heat in the heat exchange tube 6 can be transferred to the entire water body more quickly, thereby improving the heat exchange efficiency.

[0026] like Figure 2As shown, a temperature sensor 15 is fixedly connected to one end of the inner side wall of the water storage tank 1, and the temperature sensor 15 and the cylinder 13 are respectively located at both ends of the heat exchange tube 6;

[0027] In this embodiment, the temperature of the water flow in the water tank 1 is monitored by designing the temperature sensor 15 so that the staff can understand the temperature of the water flow in the water tank 1 and further facilitate the staff to discharge and use the water flow.

[0028] like Figures 3 to 5 As shown, the filter box 2 is internally slidably connected to a mounting frame 16, the filter screen 3 is fixedly connected to the middle of the mounting frame 16, and one end of the mounting frame 16 extends to the outside of the filter box 2; both ends of the filter box 2 are provided with a slide groove 17, the slide groove 17 is slidably connected to the mounting frame 16, one end of the side wall of the filter box 2 is provided with a through hole 18, the through hole 18 is movably plugged into the mounting frame 16, one end of the mounting frame 16 is fixedly connected to a baffle 19, and the middle of the baffle 19 is fixedly connected to a handle 20;

[0029] In this embodiment, when the filter 3 needs to be cleaned and replaced after long-term use, the staff can grab the handle 20 at one end of the installation frame 16 and then pull it outward to remove the installation frame 16 and the filter 3 from the filter box 2, thereby facilitating the cleaning and replacement of the filter 3. The design of the installation frame 16, the slide groove 17 and the through hole 18 allows the filter 3 to be easily removed from the filter box 2, thereby facilitating the staff to clean and replace the filter 3. The design of the baffle 19 can cover the through hole 18 on the filter box 2, thereby preventing smoke from overflowing from the gap between the through hole 18 and the installation frame 16. The design of the handle 20 makes it easy for the staff to take the installation frame 16.

[0030] Working principle: When in use, the flue gas generated by the boiler is first input into the filter box 2 through the air inlet pipe 4. The flue gas will first pass through the filter screen 3 in the filter box 2 to filter out the particulate impurities in the flue gas, thereby preventing the impurities in the flue gas from adhering to the inner wall of the heat exchange tube 6 to form a barrier layer, thereby ensuring the heat exchange efficiency of the heat exchange tube 6. After the flue gas passes through the filter screen 3, it will pass through the air guide pipe 5 into the heat exchange tube 6. At this time, the staff can inject water into the water tank 1 through the water inlet pipe 9, so that the residual heat in the flue gas will pass through the heat exchange tube 6 to heat the water. Heating, thereby realizing the recovery and utilization of the flue gas heat, wherein the heat exchange tube 6 is set to a zigzag state and a plurality of fins 7 are provided on the surface of the heat exchange tube 6, so that the contact area between the heat exchange tube 6 and the water flow can be increased, thereby improving the heat exchange efficiency. In the process of heating the water flow, the cylinder 13 can be opened, and the design of the cylinder 13 is used to drive the water pressure plate 14 to move up and down, thereby driving the water flow in the water storage tank 1 to continuously roll and flow, forming a stronger convection, so that the heat in the heat exchange tube 6 can be transferred to the entire water body more quickly, thereby improving the heat exchange efficiency. The flue gas passing through the heat exchange tube 6 will be discharged through the exhaust pipe 8. Since the flue gas has been filtered by the filter 3, the emission of pollutants is reduced to a certain extent, and the environmental protection performance is improved. In actual operation, the flue gas discharged from the exhaust pipe 8 can be filtered and purified for the second time, so that the flue gas will not cause pollution when it is discharged into the environment. When the water flow in the water storage tank 1 is heated, the valve 12 on the drain pipe 10 can be opened to discharge the heated water flow. The temperature of the water flow in the water storage tank 1 is monitored by the design of the temperature sensor 15. , so that the staff can understand the temperature of the water flow in the water storage tank 1, and then facilitate the staff to discharge and use the water flow. When the filter screen 3 needs to be cleaned and replaced after long-term use, the staff can grab the handle 20 at one end of the installation frame 16 and pull it outward to remove the installation frame 16 and the filter screen 3 from the filter box 2, thereby facilitating the cleaning and replacement of the filter screen 3. The design of the baffle 19 can cover the through hole 18 on the filter box 2, thereby preventing smoke from overflowing from the gap between the through hole 18 and the installation frame 16.

[0031] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications may be made to these embodiments without departing from the principles of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler flue gas waste heat utilization device, comprising a water storage tank (1), characterized in that: A filter box (2) is fixedly connected to one end of the side wall of the water storage tank (1), a filter screen (3) is provided inside the filter box (2), an air inlet pipe (4) is provided at the bottom of the filter box (2), an air guide pipe (5) is provided at the top of the filter box (2), one end of the air guide pipe (5) extends to the inside of the water storage tank (1) and is connected to a heat exchange pipe (6), a plurality of fins (7) are fixedly connected to the surface of the heat exchange pipe (6), the end of the heat exchange pipe (6) away from the air guide pipe (5) is connected to an exhaust pipe (8), one end of the exhaust pipe (8) extends to the outside of the water storage tank (1), a water inlet pipe (9) is provided at one end of the top of the water storage tank (1), and a drain pipe (10) is provided at the bottom of the water storage tank (1).

2. The boiler flue gas waste heat utilization device according to claim 1, characterized in that: The bottom of the water storage tank (1) is arranged in an inverted cone shape, four supporting legs (11) are fixedly connected to the bottom of the water storage tank (1), and a valve (12) is installed at one end of the drainage pipe (10).

3. The boiler flue gas waste heat utilization device according to claim 2, characterized in that: One end of the top of the inner wall of the water storage tank (1) is fixedly connected to a cylinder (13), and the output end of the cylinder (13) is fixedly connected to a water pressure plate (14).

4. The boiler flue gas waste heat utilization device according to claim 3, characterized in that: A temperature sensor (15) is fixedly connected to one end of the inner side wall of the water storage tank (1), and the temperature sensor (15) and the cylinder (13) are respectively located at two ends of the heat exchange tube (6).

5. The boiler flue gas waste heat utilization device according to claim 1, characterized in that: The filter box (2) is internally slidably connected to a mounting frame (16), the filter screen (3) is fixedly connected to the middle of the mounting frame (16), and one end of the mounting frame (16) extends to the outside of the filter box (2).

6. The boiler flue gas waste heat utilization device according to claim 5, characterized in that: The filter box (2) is provided with a slide groove (17) at both ends thereof, and the slide groove (17) is slidably connected to the installation frame (16). A through hole (18) is provided at one end of the side wall of the filter box (2), and the through hole (18) is movably plugged into the installation frame (16). A baffle (19) is fixedly connected to one end of the installation frame (16), and a handle (20) is fixedly connected to the middle of the baffle (19).

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