Tail gas waste heat utilization device for bell-type annealing furnace

Abstract

The utility model relates to the technical field of waste heat recovery, in particular to a tail gas waste heat utilization device for a bell-type annealing furnace, which can filter out solid impurities in tail gas in advance when the tail gas is subjected to waste heat recovery, so that a heat exchange mechanism is prevented from being blocked by the solid impurities in the tail gas, the heat exchange efficiency is ensured, and the tail gas waste heat utilization device is convenient to use. The practicability and the reliability are high; comprising a bottom plate, a support and a rectangular heat exchange box, the rectangular heat exchange box is fixedly installed at the upper end of the bottom plate through the support, and a cavity is formed in the rectangular heat exchange box; the device further comprises a water inlet pipe, a drainage mechanism, a heat exchange mechanism, a conveying mechanism and a filtering mechanism, the water inlet pipe is installed on the left portion of the rectangular heat exchange box and provided with a one-way valve, the output end of the water inlet pipe communicates with the left portion of a cavity of the rectangular heat exchange box, and the input end of the drainage mechanism communicates with the right portion of the cavity of the rectangular heat exchange box.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of waste heat recovery, particularly relates to a cover type annealing furnace tail gas waste heat utilization device. BACKGROUND

[0002] The annealing furnace will produce a large amount of high-temperature flue gas in the use process, if these flue gases are directly discharged into the air, not only will pollute the air, but also will waste a lot of heat energy, so the tail gas waste heat utilization device is needed to recover the heat energy in these flue gases. In the prior art, the utility model patent with patent application number 202022210043.6 discloses a kind of recovery device of tail gas waste heat, it is mainly by heating tank and serpentine pipe etc. composition, serpentine pipe is installed in heating tank, heating tank is equipped with water, it passes into high-temperature flue gas into serpentine pipe, makes flue gas pass through the tube wall of serpentine pipe and the water in heating tank and exchanges heat, and then the heat in flue gas is recovered;However, it has the following problems in the use process, since it directly passes into high-temperature flue gas into serpentine pipe, after long time use, the dust in flue gas will gradually adhere to the tube wall of serpentine pipe, easy to cause the blockage of serpentine pipe, affect heat exchange efficiency, so a kind of tail gas waste heat utilization device with high-temperature flue gas filtering function is needed. UTILITY MODEL CONTENTS

[0003] To solve the above technical problems, the utility model provides a kind of cover type annealing furnace tail gas waste heat utilization device, which can filter out solid impurities in tail gas in advance when waste heat is recovered, avoids that solid impurities in tail gas cause the blockage of heat exchange mechanism, guarantees the efficiency of heat exchange, is convenient to use, practical and reliable.

[0004] The utility model discloses a cover type annealing furnace tail gas waste heat utilization device, including bottom plate, support and rectangular heat exchange box, rectangular heat exchange box is fixedly installed on the bottom plate upper end through the support, is provided with the chamber in the rectangular heat exchange box, still including inlet pipe, drainage mechanism, heat exchange mechanism, conveying mechanism and filter mechanism, install in the left part of rectangular heat exchange box of inlet pipe, is provided with check valve on the inlet pipe, and the output end of inlet pipe is connected with the left part of rectangular heat exchange box chamber, and the right part of rectangular heat exchange box chamber is connected with the input end of drainage mechanism, and drainage mechanism has the function of drainage, heat exchange mechanism is installed on the rectangular heat exchange box, and heat exchange mechanism has the function of heat exchange, filter mechanism is installed on the bottom plate, and filter mechanism has the function of filtration, and the output of filter mechanism is communicated with heat exchange mechanism through conveying mechanism, when the waste heat recovery of tail gas in annealing furnace is carried out, the tail gas exhaust pipeline of annealing furnace is connected with filter mechanism, makes high temperature tail gas first into filter mechanism and filters out solid impurities, after that, high temperature tail gas enters heat exchange mechanism through conveying mechanism, and the water of staff outside is added to the rectangular heat exchange box chamber through inlet pipe, makes the water in rectangular heat exchange box chamber and heat exchange mechanism carry out heat exchange, makes the water temperature rise, and the water after temperature rise is collected after being discharged through drainage mechanism, after that, tail gas is discharged to the waste gas treatment mechanism outside through heat exchange mechanism and is further treated, can filter out solid impurities in tail gas in advance when the waste heat recovery of tail gas is carried out, avoids the solid impurities in tail gas and causes the blockage of heat exchange mechanism, guarantees the efficiency of heat exchange, convenient to use, and practicality and reliability are high.

[0005] Preferably, the heat exchange mechanism includes a plurality of heat exchange pipes, an exhaust pipe and an air inlet pipe, the plurality of heat exchange pipes are installed in the rectangular heat exchange box, the left ends of the plurality of groups of heat exchange pipes are communicated with the exhaust pipe, the right ends of the plurality of heat exchange pipes are communicated with the air inlet pipe, and the input end of the air inlet pipe is connected with the conveying mechanism; the middle parts of the plurality of heat exchange pipes are located in the chamber of the rectangular heat exchange box; when in use, the exhaust pipe is connected with the waste gas treatment mechanism outside, the filtered flue gas enters the air inlet pipe through the conveying mechanism, then the flue gas enters the plurality of heat exchange pipes, the flue gas in the plurality of heat exchange pipes exchanges heat with the water in the chamber of the rectangular heat exchange box through the pipe walls of the plurality of heat exchange pipes, the water in the chamber of the rectangular heat exchange box is heated, and then the waste gas in the plurality of heat exchange pipes enters the waste gas treatment mechanism outside through the exhaust pipe for continuous treatment; the waste heat recovery of the waste gas is facilitated, and the convenience is improved.

[0006] Preferably, the drainage mechanism comprises a liquid discharge pipe, a water tank, a delivery pump, a delivery pipe, a return pipe and a water outlet pipe, the upper end of the liquid discharge pipe is communicated with the right part of the rectangular heat exchange tank chamber, the lower end of the liquid discharge pipe is communicated with the water tank, the water tank is provided with a thermometer, the water tank is provided with a water cavity, the input end of the delivery pump is communicated with the water tank, the output end of the delivery pump is provided with the delivery pipe, the input ends of the return pipe and the water outlet pipe are communicated with the delivery pipe, the return pipe and the water outlet pipe are provided with valves, the output end of the return pipe is communicated with the left part of the rectangular heat exchange tank chamber, the valve on the return pipe is in a normally closed state; the water outlet pipe is connected with an external hot water collecting system; when water from outside is added into the rectangular heat exchange tank chamber through the water inlet pipe, the water is heated with the plurality of heat exchange pipes and then enters the water tank through the liquid discharge pipe; when the thermometer on the water tank shows that the water temperature in the water tank reaches a specified value, the valve on the return pipe is closed, the valve on the water outlet pipe is opened, and then the delivery pump is opened, so that the hot water in the water tank is sequentially discharged into the external hot water collecting system through the delivery pump, the delivery pipe and the water outlet pipe; when the thermometer on the water tank shows that the water temperature in the water tank does not reach the specified value, the addition of water into the water inlet pipe is stopped, the valve on the water outlet pipe is closed, the valve on the return pipe is opened, and then the delivery pump is opened, so that the water in the water tank is sequentially returned to the rectangular heat exchange tank chamber through the delivery pump, the delivery pipe and the return pipe to exchange heat with the flue gas in the plurality of heat exchange pipes again, thereby increasing the water temperature.

[0007] Preferably, the delivery mechanism comprises an air induction fan and a gas delivery pipe, the input end of the air induction fan is connected with the filtering mechanism, and the output end of the air induction fan is connected with the heat exchange mechanism through the gas delivery pipe; when the flue gas in the annealing furnace is filtered through the filtering mechanism, the air induction fan is opened, so that the filtered flue gas enters the heat exchange mechanism through the air induction fan and the gas delivery pipe to exchange heat with the water in the rectangular heat exchange tank chamber.

[0008] Preferably, the filtration mechanism includes a moving mechanism, a filter box, a pipe, a sealing cover, filter plate A, a connecting rod, and filter plate B. The filter box is mounted on a base plate and has a cavity inside. The front end of the filter box is open. The sealing cover is bolted to the front end of the filter box. The pipe is installed at the front of the filter box, and its output end communicates with the front of the cavity of the filter box. A valve is installed on the pipe. Filter plate A and filter plate B are both slidably mounted back and forth in the cavity of the filter box. Filter plate B is mounted to the front end of filter plate A via a connecting rod. Filter plate A has multiple filter holes A, and filter plate B has multiple filter holes B. Filter plate A is mounted on the moving mechanism. The moving mechanism is used to move filter plate A back and forth. The input end of the induced draft fan is connected to the rear of the filter box cavity. The induced draft fan is located behind filter plate A, and the pipe is located in front of filter plate B. The diameter of filter hole A is smaller than the diameter of filter hole B. Filter plate A is mounted on the moving mechanism. The flue gas pipe on the annealing furnace is connected to the pipe, so that the flue gas enters the cavity of the filter box through the pipe. After being filtered by filter plate B and filter plate A, the flue gas enters the inlet pipe and multiple heat exchange tubes through the induced draft fan and the gas delivery pipe. The filtration of the flue gas by filter plate B and filter plate A prevents solid impurities in the flue gas from entering the heat exchange tubes and causing blockage, thus improving the reliability during use.

[0009] Preferably, the moving mechanism includes a hydraulic cylinder and a push rod. The hydraulic cylinder is installed at the rear end of the filter box, and the push rod is slidably installed on the filter box. The rear end of the push rod is connected to the output end of the hydraulic cylinder, and the filter plate A is fixedly installed at the front end of the push rod. When it is necessary to clean the solid impurities attached to the filter plate A and the connecting rod, first stop the flow of flue gas into the filter box, then remove the sealing cover from the front end of the filter box, and then open the hydraulic cylinder. The hydraulic cylinder moves the filter plate A, the connecting rod, and the filter plate B forward through the push rod, so that the filter plate A and the filter plate B move forward out of the cavity of the filter box. Then, the operator cleans the solid impurities on the filter plate A and the filter plate B from the outside of the filter box, which facilitates the cleaning of solid impurities on the filter plate A and the filter plate B.

[0010] Preferably, the sealing cap is provided with a handle, and the handle is provided with a grip sleeve; the above configuration facilitates the taking and putting away of the sealing cap.

[0011] Compared with the prior art, the advantages of this utility model are as follows: when recovering waste heat from exhaust gas, solid impurities in the exhaust gas can be filtered out in advance, avoiding blockage of the heat exchange mechanism by solid impurities in the exhaust gas, ensuring heat exchange efficiency, and making it convenient to use, practical and reliable. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the first isometric structure of this utility model;

[0013] Figure 2Is the second axis measurement structure schematic diagram of the utility model;

[0014] Figure 3 Is the structure schematic diagram of filter mechanism and conveying mechanism;

[0015] Figure 4 Is the structure schematic diagram of drainage mechanism;

[0016] Figure 5 Is the structure schematic diagram of hydraulic cylinder, push rod and filter plate A etc.;

[0017] Figure 6 Is the structure schematic diagram of heat exchange mechanism.

[0018] Marked in the drawing: 1, bottom plate;2, support;3, rectangular heat exchange box;4, water inlet pipe;5, heat exchange pipe;6, exhaust pipe;7, air inlet pipe;8, liquid outlet pipe;9, water tank;10, conveying pump;11, conveying pipe;12, backflow pipe;13, water outlet pipe;14, induced draft fan;15, gas conveying pipe;17, filter box;18, pipeline;19, sealing cover;20, filter plate A;21, connecting rod;22, filter plate B;23, hydraulic cylinder;24, push rod. DETAILED DESCRIPTION

[0019] In order to facilitate understanding the utility model, below will be with reference to relevant drawing more comprehensive description of the utility model. The utility model can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive. EMBODIMENT

[0020] As Figures 1 to 6The waste heat utilization device for the tail gas of the bell-type annealing furnace of this utility model includes a base plate 1, a support 2, a rectangular heat exchange box 3, a water inlet pipe 4, a drainage mechanism, a heat exchange mechanism, a conveying mechanism, and a filtration mechanism. The rectangular heat exchange box 3 is fixedly installed on the upper end of the base plate 1 by the support 2. The rectangular heat exchange box 3 is provided with a chamber. The water inlet pipe 4 is installed on the left side of the rectangular heat exchange box 3. A one-way valve is installed on the water inlet pipe 4. The output end of the water inlet pipe 4 is connected to the left side of the chamber of the rectangular heat exchange box 3. The input end of the drainage mechanism is connected to the right side of the chamber of the rectangular heat exchange box 3. The drainage mechanism has the function of drainage. The heat exchange mechanism is installed on the rectangular heat exchange box 3. The heat exchange mechanism has the function of heat exchange. The filtration mechanism is installed on the base plate 1. The filtration mechanism has the function of filtration. The output end of the filtration mechanism is connected to the heat exchange mechanism through the conveying mechanism. When recovering waste heat from the exhaust gas in the annealing furnace, the exhaust gas discharge pipe of the annealing furnace is connected to the filtration mechanism, so that the high-temperature exhaust gas first enters the filtration mechanism to filter out solid impurities. Then, the high-temperature exhaust gas enters the heat exchange mechanism through the conveying mechanism. At the same time, water from outside is added to the rectangular heat exchange box 3 through the water inlet pipe 4, so that the water exchanges heat with the heat exchange mechanism in the rectangular heat exchange box 3, raising the water temperature. The heated water is discharged through the drainage mechanism and collected for use. Afterward, the exhaust gas is discharged through the heat exchange mechanism to the external waste gas treatment mechanism for further treatment. In recovering waste heat from the exhaust gas, solid impurities in the exhaust gas can be filtered out in advance, avoiding blockage of the heat exchange mechanism by solid impurities in the exhaust gas, ensuring heat exchange efficiency, and making it convenient to use, practical and reliable.

[0021] like Figure 1 and Figure 6 The heat exchange mechanism includes multiple heat exchange tubes 5, an exhaust pipe 6, and an inlet pipe 7. The multiple heat exchange tubes 5 are all installed inside a rectangular heat exchange box 3. The left ends of the multiple heat exchange tubes 5 are connected to the exhaust pipe 6, and the right ends of the multiple heat exchange tubes 5 are connected to the inlet pipe 7. The input end of the inlet pipe 7 is connected to a conveying mechanism. The middle sections of the multiple heat exchange tubes 5 are located within the chamber of the rectangular heat exchange box 3. In use, the exhaust pipe 6 is connected to an external waste gas treatment mechanism. The filtered flue gas enters the inlet pipe 7 via the conveying mechanism, and then enters the multiple heat exchange tubes 5. The flue gas in the multiple heat exchange tubes 5 exchanges heat with the water in the chamber of the rectangular heat exchange box 3 through the tube walls, raising the temperature of the water in the chamber. The waste gas in the multiple heat exchange tubes 5 then enters the external waste gas treatment mechanism via the exhaust pipe 6 for further treatment. This facilitates the recovery of residual heat from the waste gas and improves convenience.

[0022] like Figure 1 and Figure 4The drainage mechanism comprises a drainage pipe 8, a water tank 9, a delivery pump 10, a delivery pipe 11, a return pipe 12 and a water outlet pipe 13. The upper end of the drainage pipe 8 is communicated with the right part of the chamber of the rectangular heat exchange tank 3, and the lower end of the drainage pipe 8 is communicated with the water tank 9. A thermometer is arranged on the water tank 9, and a water cavity is arranged in the water tank 9. The input end of the delivery pump 10 is communicated with the water tank 9, and the output end of the delivery pump 10 is provided with the delivery pipe 11. The input ends of the return pipe 12 and the water outlet pipe 13 are communicated with the delivery pipe 11. Valves are arranged on the return pipe 12 and the water outlet pipe 13. The output end of the return pipe 12 is communicated with the left part of the chamber of the rectangular heat exchange tank 3, and the valve on the return pipe 12 is in a normally closed state. The water outlet pipe 13 is connected with an external hot water collecting system. When water from outside is added into the chamber of the rectangular heat exchange tank 3 through the water inlet pipe 4, the water is heated by the plurality of heat exchange pipes 5 and then enters the water tank 9 through the drainage pipe 8. When the thermometer on the water tank 9 shows that the water temperature in the water tank 9 reaches a specified value, the valve on the return pipe 12 is closed, the valve on the water outlet pipe 13 is opened, and then the delivery pump 10 is opened, so that the hot water in the water tank 9 is sequentially discharged into the external hot water collecting system through the delivery pump 10, the delivery pipe 11 and the water outlet pipe 13. When the thermometer on the water tank 9 shows that the water temperature in the water tank 9 does not reach the specified value, the addition of water into the water inlet pipe 4 is stopped, the valve on the water outlet pipe 13 is closed, the valve on the return pipe 12 is opened, and then the delivery pump 10 is opened, so that the water in the water tank 9 is sequentially returned into the chamber of the rectangular heat exchange tank 3 through the delivery pump 10, the delivery pipe 11 and the return pipe 12 to exchange heat with the flue gas in the plurality of heat exchange pipes 5, thereby increasing the water temperature.

[0023] As Figure 1 and Figure 3 The delivery mechanism comprises an air induction fan 14 and a gas delivery pipe 15. The input end of the air induction fan 14 is connected with the filtering mechanism, and the output end of the air induction fan 14 is connected with the heat exchange mechanism through the gas delivery pipe 15. After the flue gas in the annealing furnace is filtered through the filtering mechanism, the air induction fan 14 is opened, so that the filtered flue gas enters the heat exchange mechanism through the air induction fan 14 and the gas delivery pipe 15 to exchange heat with the water in the chamber of the rectangular heat exchange tank 3.

[0024] As Figure 1 , Figure 4 and Figure 5The filtering mechanism comprises a moving mechanism, a filtering box 17, a pipeline 18, a sealing cover 19, a filtering plate A 20, a connecting rod 21 and a filtering plate B 22. The filtering box 17 is installed on the bottom plate 1 and is provided with a cavity. The front end of the filtering box 17 is provided with an opening. The sealing cover 19 is installed on the front end of the filtering box 17 through bolts. The pipeline 18 is installed on the front part of the filtering box 17. The output end of the pipeline 18 is communicated with the front part of the cavity of the filtering box 17. The pipeline 18 is provided with a valve. The filtering plate A 20 and the filtering plate B 22 are both slidingly installed in the cavity of the filtering box 17. The filtering plate B 22 is installed on the front end of the filtering plate A 20 through the connecting rod 21. The filtering plate A 20 is provided with a plurality of filter holes A. The filtering plate B 22 is provided with a plurality of filter holes B. The filtering plate A 20 is installed on the moving mechanism. The moving mechanism is used for moving the filtering plate A 20 forward and backward. The input end of the induced draft fan 14 is communicated with the rear part of the cavity of the filtering box 17. The induced draft fan 14 is located at the rear side of the filtering plate A 20. The pipeline 18 is located at the front side of the filtering plate B 22. The diameter of the filter hole A is smaller than that of the filter hole B. The filtering plate A 20 is installed on the moving mechanism. The smoke exhaust pipe on the annealing furnace is connected with the pipeline 18. The flue gas enters into the cavity of the filtering box 17 through the pipeline 18. Then, the flue gas enters into the gas inlet pipe 7 and the plurality of heat exchange pipes 5 through the induced draft fan 14 and the gas conveying pipe 15 after being filtered by the filtering plate B 22 and the filtering plate A 20. Through the filtering of the flue gas by the filtering plate B 22 and the filtering plate A 20, the solid impurities in the flue gas are prevented from entering into the heat exchange pipes 5 to cause blockage. The reliability in use is improved.

[0025] As Figure 3 and Figure 5 The moving mechanism comprises a hydraulic cylinder 23 and a push rod 24. The hydraulic cylinder 23 is installed on the rear end of the filtering box 17. The push rod 24 is slidingly installed on the filtering box 17. The rear end of the push rod 24 is connected with the output end of the hydraulic cylinder 23. The filtering plate A 20 is fixedly installed on the front end of the push rod 24. When it is needed to clean the solid impurities attached on the filtering plate A 20 and the connecting rod 21, the flue gas is first stopped from being introduced into the filtering box 17. Then, the sealing cover 19 is dismounted from the front end of the filtering box 17. Then, the hydraulic cylinder 23 is opened. The hydraulic cylinder 23 moves the filtering plate A 20, the connecting rod 21 and the filtering plate B 22 forward through the push rod 24. The filtering plate A 20 and the filtering plate B 22 are moved forward out of the cavity of the filtering box 17. Then, the solid impurities on the filtering plate A 20 and the filtering plate B 22 are cleaned by the staff outside the filtering box 17. The cleaning of the solid impurities on the filtering plate A 20 and the filtering plate B 22 is facilitated. Embodiment

[0026] On the basis of embodiment 1, a handle is arranged on the sealing cover 19. A handle sleeve is arranged on the handle. Through the above arrangement, the taking and placing of the sealing cover 19 are facilitated.

[0027] The heat exchange pipe 5, the conveying pump 10, the filter box 17, the filter plate A 20 and the hydraulic cylinder 23 of the cover type annealing furnace tail gas waste heat utilization device are all purchased on the market, and the technical personnel in the industry only needs to install and operate according to the attached instruction manual, and the technical personnel in the field does not need to pay creative labor.

[0028] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary technical personnel in the technical field, several improvements and modifications can be made without departing from the technical principle of the utility model, and these improvements and modifications should be regarded as the protection range of the utility model.

Claims

1. A device for utilizing waste heat from exhaust gas of a bell-type annealing furnace, comprising a base plate (1), a support (2), and a rectangular heat exchange box (3), wherein the rectangular heat exchange box (3) is fixedly installed on the upper end of the base plate (1) via the support (2), and a chamber is provided inside the rectangular heat exchange box (3); characterized in that, It also includes an inlet pipe (4), a drainage mechanism, a heat exchange mechanism, a conveying mechanism, and a filtration mechanism. The inlet pipe (4) is installed on the left side of the rectangular heat exchange box (3). A one-way valve is installed on the inlet pipe (4). The output end of the inlet pipe (4) is connected to the left side of the chamber of the rectangular heat exchange box (3). The input end of the drainage mechanism is connected to the right side of the chamber of the rectangular heat exchange box (3). The drainage mechanism has the function of draining water. The heat exchange mechanism is installed on the rectangular heat exchange box (3). The heat exchange mechanism has the function of heat exchange. The filtration mechanism is installed on the base plate (1). The filtration mechanism has the function of filtering water. The output end of the filtration mechanism is connected to the heat exchange mechanism through the conveying mechanism.

2. The device for utilizing waste heat from the tail gas of a bell-type annealing furnace as described in claim 1, characterized in that, The heat exchange mechanism includes multiple heat exchange tubes (5), an exhaust pipe (6), and an inlet pipe (7). The multiple heat exchange tubes (5) are all installed inside a rectangular heat exchange box (3). The left end of the multiple heat exchange tubes (5) is connected to the exhaust pipe (6), and the right end of the multiple heat exchange tubes (5) is connected to the inlet pipe (7). The input end of the inlet pipe (7) is connected to the conveying mechanism.

3. The waste heat utilization device for the tail gas of a bell-type annealing furnace as described in claim 1, characterized in that, The drainage mechanism includes a drain pipe (8), a water tank (9), a delivery pump (10), a delivery pipe (11), a return pipe (12), and an outlet pipe (13). The upper end of the drain pipe (8) is connected to the right side of the rectangular heat exchange box (3) chamber, and the lower end of the drain pipe (8) is connected to the water tank (9). A thermometer is installed on the water tank (9), and a water cavity is installed inside the water tank (9). The input end of the delivery pump (10) is connected to the water tank (9), and the output end of the delivery pump (10) is provided with a delivery pipe (11). The input ends of the return pipe (12) and the outlet pipe (13) are both connected to the delivery pipe (11). Valves are installed on the return pipe (12) and the outlet pipe (13). The output end of the return pipe (12) is connected to the left side of the rectangular heat exchange box (3) chamber, and the valve on the return pipe (12) is normally closed.

4. The waste heat utilization device for the tail gas of a bell-type annealing furnace as described in claim 1, characterized in that, The conveying mechanism includes an induced draft fan (14) and an air supply pipe (15). The input end of the induced draft fan (14) is connected to the filter mechanism, and the output end of the induced draft fan (14) is connected to the heat exchange mechanism through the air supply pipe (15).

5. The waste heat utilization device for annealing furnace tail gas as described in claim 4, characterized in that, The filtration mechanism includes a moving mechanism, a filter box (17), a pipe (18), a sealing cover (19), a filter plate A (20), a connecting rod (21), and a filter plate B (22). The filter box (17) is mounted on the base plate (1). A cavity is provided inside the filter box (17). The front end of the filter box (17) is set as an opening. The sealing cover (19) is installed on the front end of the filter box (17) by bolts. The pipe (18) is installed at the front of the filter box (17). The output end of the pipe (18) is connected to the front of the cavity of the filter box (17). A valve is provided on the pipe (18). The filter plate A (20) and the filter plate B (22) are connected to the filter plate B (22). Both are slidably installed in the cavity of the filter box (17). The filter plate B (22) is installed at the front end of the filter plate A (20) through the connecting rod (21). The filter plate A (20) is provided with multiple filter holes A, and the filter plate B (22) is provided with multiple filter holes B. The filter plate A (20) is installed on the moving mechanism, which is used to move the filter plate A (20) back and forth. The input end of the blower (14) is connected to the rear of the cavity of the filter box (17). The blower (14) is located on the rear side of the filter plate A (20), and the pipe (18) is located on the front side of the filter plate B (22). The diameter of the filter hole A is smaller than the diameter of the filter hole B.

6. The waste heat utilization device for the tail gas of a bell-type annealing furnace as described in claim 5, characterized in that, The moving mechanism includes a hydraulic cylinder (23) and a push rod (24). The hydraulic cylinder (23) is installed at the rear end of the filter box (17). The push rod (24) is slidably installed on the filter box (17). The rear end of the push rod (24) is connected to the output end of the hydraulic cylinder (23). The filter plate A (20) is fixedly installed at the front end of the push rod (24).

7. The device for utilizing waste heat from the tail gas of a bell-type annealing furnace as described in claim 5, characterized in that, The sealing cap (19) is provided with a handle, and the handle is provided with a handle sleeve.

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