Heating furnace flue gas waste heat recovery device and method

Abstract

The invention discloses a heating furnace flue gas waste heat recovery device, and particularly relates to the technical field of heating furnace waste heat recovery, which comprises a recovery tank for recovering heating furnace flue gas waste heat, a waste heat recovery assembly and a filtering and collecting assembly, the waste heat recovery assembly is arranged on the recovery tank; the waste heat recovery assembly comprises an air inlet pipe, an exhaust pipe, a water inlet pipe, a water outlet pipe and a heat exchange pipe. The air inlet pipe and the exhaust pipe are fixedly arranged on the circumferential surface of the recovery tank and communicate with the recovery tank, and a filtering and collecting assembly is arranged on the air inlet pipe; the water inlet pipe and the water outlet pipe penetrate through the circumferential surface of the recovery tank and are fixedly connected with the recovery tank; the heat exchange pipe is arranged in the recovery tank, and the two ends of the heat exchange pipe are fixedly connected with the water inlet pipe and the water outlet pipe correspondingly. The heat exchange tube and the flue gas of the heating furnace form retention type contact; the device is reasonable in structural design, through the single heat exchange tube, the use cost can be reduced, the recovery efficiency can be improved, heating furnace flue gas can make full contact with the heat exchange tubes, and the utilization rate of flue gas waste heat recovery of the heating furnace is greatly increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating furnace waste heat recovery, more particularly, the present application relates to a heating furnace flue gas waste heat recovery device and method. BACKGROUND

[0002] The heating furnace is an industrial equipment for heating materials or workpieces (generally metal) to the required temperature, mainly used in metallurgy, forging and pressing, gas processing and other fields, which can be divided into coal-fired, oil-fired or gas-fired heating furnaces according to the fuel type; can be divided into chamber furnace, continuous furnace and other according to the structure; can be divided into trolley type, rotary hearth type and other according to the mechanization form, which is commonly used in metal forging, rolling, spraying and drying processes, for example, continuous heating furnace can heat billets to 900-1350 DEG C to meet the rolling requirements.

[0003] The heating furnace flue gas waste heat recovery device provided by the Chinese utility model patent with publication number CN209043058U has a plurality of heat exchangers stacked on the mounting bracket, the heat exchanger includes a plurality of heat exchange pipes, a first baffle, a second baffle, a first sealing cover and a second sealing cover, the first baffle and the second baffle are both provided with a plurality of through holes, one end of the heat exchange pipe is welded with the first baffle after penetrating through the through hole of the first baffle, and the other end is welded with the second baffle after penetrating through the through hole of the second baffle, the periphery of the first sealing cover is welded on the first baffle and forms a feeding cavity with the first baffle, the periphery of the second sealing cover is welded on the second baffle and forms a discharging cavity with the second baffle, a feeding pipe is communicated with the feeding cavity of the uppermost heat exchanger, a discharging pipe is communicated with the discharging cavity of the lowermost heat exchanger, and the feeding cavity of the lower heat exchanger and the discharging cavity of the upper heat exchanger of the adjacent two heat exchangers are communicated. The heat of the flue gas is efficiently recovered, and the cracking of the pipe welding position is avoided.

[0004] At present, in the process of using the heating furnace on the market, a recovery device needs to be used to recover the flue gas waste heat. However, in the process of using the existing recovery device, a plurality of heat exchangers are usually used to realize the heat exchange of the cold-state medium raw material (such as liquid water), which not only increases the use cost, but also causes the residence time of the heating furnace flue gas to be short due to the flow contact between the heating furnace flue gas and the heat exchanger, thereby reducing the utilization rate of the heating furnace flue gas waste heat recovery and affecting the use effect of the recovery device. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides a heating furnace flue gas waste heat recovery device, and the technical problems to be solved by the present application are that the existing recovery device usually uses a plurality of heat exchangers to realize the heat exchange of the cold-state medium raw material in the process of use, which not only increases the use cost, but also causes the residence time of the heating furnace flue gas to be short due to the flow contact between the heating furnace flue gas and the heat exchanger, thereby reducing the utilization rate of the heating furnace flue gas waste heat recovery and affecting the use effect of the recovery device.

[0006] To achieve the above object, the present application provides the following technical scheme: a heating furnace flue gas waste heat recovery device, comprising a recovery tank for heating furnace flue gas waste heat recovery, a waste heat recovery assembly and a filter assembly; the waste heat recovery assembly is arranged on the recovery tank; the waste heat recovery assembly comprises an air inlet pipe, an air outlet pipe, a water inlet pipe, a water outlet pipe and a heat exchange pipe; the air inlet pipe and the air outlet pipe are both fixedly arranged on the circumferential surface of the recovery tank and communicate with the recovery tank, and the air inlet pipe is provided with the filter assembly; the water inlet pipe and the water outlet pipe are both arranged through the circumferential surface of the recovery tank and fixedly connected with the recovery tank; the heat exchange pipe is arranged in the recovery tank, and the two ends of the heat exchange pipe are fixedly connected with the water inlet pipe and the water outlet pipe respectively; the heat exchange pipe and the heating furnace flue gas constitute a stagnant contact.

[0007] As a further scheme of the present application: the air inlet pipe is L-shaped structure with small upper part and large lower part, and the heat exchange pipe is spiral structure.

[0008] As a further scheme of the present application: the filter assembly comprises a connecting groove, a connecting block, a flow-through groove, a collecting cylinder, a blade and a filter block; the connecting groove is arranged on the vertical pipe of the air inlet pipe; the connecting block is inserted into the connecting groove through a reinforcing assembly; the flow-through groove is arranged in the connecting block, and the diameter size of the flow-through groove is matched with the inner diameter size of the vertical pipe of the air inlet pipe; the collecting cylinder is connected with the inner wall of the flow-through groove through a guide assembly; a plurality of blades are annularly arranged on the inner circumferential surface of the collecting cylinder; and the filter block is fixedly arranged in the collecting cylinder.

[0009] As a further scheme of the present application: the connecting block is wedge-shaped structure with U-shaped inclined surface on the inner side and arc-shaped surface on the outer side, and the center of the connecting block is on the axis of the vertical pipe of the air inlet pipe.

[0010] As a further scheme of the present application: the collecting cylinder is circular truncated cone structure with large upper part and small lower part, the filter block is conical mesh structure, and the tip of the filter block is upwardly arranged.

[0011] As a further scheme of the present application: the reinforcing assembly comprises a containing groove, a reinforcing groove, a reinforcing block and a spring; at least two containing grooves are symmetrically arranged on both sides of the connecting block; at least two reinforcing grooves are symmetrically arranged on both sides of the inner wall of the connecting groove; the reinforcing block is slidably arranged in the containing groove, and the reinforcing block is insertedly matched with the reinforcing groove; and the spring is fixedly connected with the inner wall of the containing groove and the reinforcing block at both ends.

[0012] As a further scheme of the present application: the reinforcing block is prismatic structure, the size of the side close to the spring of the reinforcing block is larger than the size of the side away from the spring, and the inclined surface of the reinforcing block is in contact with the inner wall of the containing groove.

[0013] As a further scheme of the present application: the guide assembly comprises a guide block, a rotating groove and a rotating block; the guide block is fixed on the top surface of the collecting cylinder; the inner wall of the flow-through groove is provided with the rotating groove; and the rotating block is rotatably arranged in the rotating groove and fixedly connected with the guide block.

[0014] As a further scheme of the present application: the guide block is in an annular structure, the longitudinal section of the guide block is in a right-angled triangle structure, the inclined surface of the guide block is inwardly arranged, and the outer circumferential surface of the guide block is in contact with the inner circumferential surface of the vertical pipe of the air inlet pipe.

[0015] In addition, the present application also relates to a method for a heating furnace flue gas waste heat recovery device, comprising the following steps: Step one: first, the heating furnace flue gas is transported into the recovery tank through the air inlet pipe, and is discharged through the exhaust pipe, then the cold-state medium raw material is introduced into the heat exchange pipe through the water inlet pipe, so that the cold-state medium raw material can exchange heat with the heating furnace flue gas, and then the cold-state medium raw material is discharged through the water outlet pipe, so as to realize the function of heating furnace flue gas waste heat recovery and utilization; Step two: when the heating furnace flue gas enters the air inlet pipe, the impurities in the heating furnace flue gas are filtered by the filter block, and the impeller is impacted by the impact force of the flow of the heating furnace flue gas, so that the collecting cylinder drives the filter block to rotate in the flow-through groove through the guide assembly, and the centrifugal force generated by the rotation shakes off the impurities adhered to the surface of the filter block, so as to ensure the filtering effect of the filter block; Step three: when the heating furnace flue gas flows through the guide block, the guide block can guide the heating furnace flue gas to smoothly enter the collecting cylinder, and can also avoid the accumulation of impurities in the heating furnace flue gas on the top surface of the collecting cylinder; Step four: the position of the connecting block in the connecting groove can be reinforced by the reinforcing assembly, so as to improve the stability of the filter assembly in the air inlet pipe.

[0016] The present application has the following advantages: 1、The present application sets up the waste heat recovery assembly, through the heating furnace flue gas is transported into the recovery tank through the air inlet pipe, and is discharged through the exhaust pipe, then the cold-state medium raw material is introduced into the heat exchange pipe through the water inlet pipe, so that the cold-state medium raw material can exchange heat with the heating furnace flue gas, and then the cold-state medium raw material is discharged through the water outlet pipe, so as to realize the function of heating furnace flue gas waste heat recovery and utilization, because the heat exchange pipe is in a spiral structure, by prolonging the contact area of the heat exchange pipe and the heating furnace flue gas, increasing the residence time of the cold-state medium raw material in the recovery tank, compared with the prior art, the present application has reasonable structure design, through a single heat exchange pipe, not only can reduce the use cost, improve the recovery efficiency, but also can make the heating furnace flue gas fully contact with the heat exchange pipe, greatly improve the utilization rate of the heating furnace flue gas waste heat recovery.

[0017] 2. This invention, by setting up a filter collection component and a guide component, allows the furnace flue gas to enter the inlet pipe, where it is filtered by the filter block to remove impurities. The impact force of the flue gas flow on the blades causes the collection cylinder to rotate the filter block within the flow groove. The rotating block rotates within the groove, and the centrifugal force generated by the rotation of the filter block dislodging the impurities adhering to its surface, thus ensuring the filtering effect of the filter block. Furthermore, when the furnace flue gas flows through the guide block, the guide block's right-angled triangular cross-section guides the flue gas, allowing it to smoothly enter the collection cylinder. This also prevents impurities in the furnace flue gas from accumulating on the top surface of the collection cylinder.

[0018] 3. By setting up a reinforcement component, when processing impurities in the collection cylinder, the handle on the connecting block is pulled to make the connecting block slide in the connecting groove. This causes the inclined surface of the reinforcement block to press against the inner wall of the reinforcement groove, allowing the reinforcement block to slide in the receiving groove. This causes the spring to contract under force until the end of the reinforcement block contacts the inner wall of the connecting groove. At this point, the spring stops contracting until the connecting block is removed from the connecting groove. After cleaning the impurities inside the collection cylinder, it can be reinstalled to continue the operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the intake pipe structure of the present invention; Figure 4 This is a cross-sectional view of the connecting block structure of the present invention; Figure 5 This is a partial sectional view of the structure of the present invention. Figure 6 This is a schematic diagram of the overall structure of the present invention; Figure 7 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 8 For the present invention Figure 4 Enlarged diagram of point B in the middle.

[0020] In the diagram: 1. Recovery tank; 2. Waste heat recovery assembly; 3. Filter collection assembly; 4. Reinforcement assembly; 5. Guide assembly; 201. Air inlet pipe; 202. Exhaust pipe; 203. Water inlet pipe; 204. Water outlet pipe; 205. Heat exchanger pipe; 301. Connecting groove; 302. Connecting block; 303. Flow groove; 304. Collection cylinder; 305. Blade; 306. Filter block; 401. Receiving groove; 402. Reinforcement groove; 403. Reinforcement block; 404. Spring; 501. Guide block; 502. Rotating groove; 503. Rotating block. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0022] As shown in Figures 1 to 8 The present application provides a heating furnace flue gas waste heat recovery device, which comprises a recovery tank 1 for heating furnace flue gas waste heat recovery, a waste heat recovery assembly 2 and a filter assembly 3; the waste heat recovery assembly 2 is arranged on the recovery tank 1; the waste heat recovery assembly 2 comprises an air inlet pipe 201, an air outlet pipe 202, a water inlet pipe 203, a water outlet pipe 204 and a heat exchange pipe 205; the air inlet pipe 201 and the air outlet pipe 202 are both fixedly welded on the circumferential surface of the recovery tank 1 and communicate with the recovery tank 1, and the air inlet pipe 201 is provided with the filter assembly 3; the water inlet pipe 203 and the water outlet pipe 204 are both arranged on the circumferential surface of the recovery tank 1 and fixedly connected with the recovery tank 1; the heat exchange pipe 205 is arranged in the recovery tank 1, and the two ends of the heat exchange pipe 205 are fixedly connected with the water inlet pipe 203 and the water outlet pipe 204 respectively; the heat exchange pipe 205 and the heating furnace flue gas constitute a stagnant contact; the air inlet pipe 201 is in an L-shaped structure with a small upper part and a large lower part, so that the impurities in the heating furnace flue gas can fall into the collecting cylinder 304 by their own weight, and the heat exchange pipe 205 is in a spiral structure.

[0023] The present application sets the waste heat recovery assembly 2, sends the heating furnace flue gas into the recovery tank 1 through the air inlet pipe 201, discharges it through the air outlet pipe 202, and then makes the cold-state medium raw material enter into the heat exchange pipe 205 through the water inlet pipe 203, so that the cold-state medium raw material can exchange heat with the heating furnace flue gas, and then discharges it through the water outlet pipe 204, to realize the function of heating furnace flue gas waste heat recovery and utilization. Since the heat exchange pipe 205 is in a spiral structure, the contact area between the heat exchange pipe 205 and the heating furnace flue gas is prolonged, and the residence time of the cold-state medium raw material in the recovery tank 1 is increased. Compared with the prior art, the structure design of the present application is reasonable, a single heat exchange pipe 205 can not only reduce the use cost and improve the recovery efficiency, but also make the heating furnace flue gas fully contact with the heat exchange pipe 205, greatly improving the utilization rate of heating furnace flue gas waste heat recovery.

[0024] As a preferred embodiment, the filter assembly 3 comprises a connecting groove 301, a connecting block 302, a flow-through groove 303, a collecting cylinder 304, six blades 305 and a filter block 306; the connecting groove 301 is formed on the vertical pipe of the air inlet pipe 201; the connecting block 302 is inserted into the connecting groove 301 through the reinforcing assembly 4; the flow-through groove 303 is formed in the connecting block 302, and the diameter of the flow-through groove 303 is matched with the inner diameter of the vertical pipe of the air inlet pipe 201; the collecting cylinder 304 is connected with the inner wall of the flow-through groove 303 through the guide assembly 5; the six blades 305 are fixedly welded on the inner circumferential surface of the collecting cylinder 304 in a ring array; the filter block 306 is fixedly welded in the collecting cylinder 304; the collecting cylinder 304 and the filter block 306 are made of high-temperature-resistant materials (such as glass fiber, stainless steel, etc.); the connecting block 302 has a wedge-shaped structure with a U-shaped inclined surface on the inner side and an arc-shaped surface on the outer side, which can not only guide the insertion of the connecting block 302 and the connecting groove 301, but also increase the contact area between the connecting block 302 and the connecting groove 301 to improve the sealing effect, and the arc-shaped surface can ensure the aesthetics and tightness of the device, and the center of the connecting block 302 is on the axis of the vertical pipe of the air inlet pipe 201; the collecting cylinder 304 has a circular truncated cone structure with a large upper part and a small lower part, so that the impurities in the flue gas of the heating furnace can fall on the inner bottom wall of the collecting cylinder 304, and the filter block 306 has a conical mesh structure with the sharp end upward, which can not only increase the contact area with the flue gas of the heating furnace, but also facilitate the separation of the impurities adhered to the surface by centrifugal force. The guide assembly 5 comprises a guide block 501, a rotating groove 502 and a rotating block 503; the guide block 501 is fixedly welded on the top surface of the collecting cylinder 304; the collecting cylinder 304, the filter block 306 and the guide block 501 are all in the flow-through groove 303; the rotating groove 502 is formed in the inner wall of the flow-through groove 303; the rotating block 503 is rotatably arranged in the rotating groove 502 and fixedly connected with the guide block 501; the guide block 501 has a ring structure, and the longitudinal section of the guide block 501 is a right triangle structure, the inclined surface of the guide block 501 is inwardly arranged, and the outer circumferential surface of the guide block 501 is in contact with the inner circumferential surface of the vertical pipe of the air inlet pipe 201.

[0025] The application sets the filter assembly 3 and the guide assembly 5, when the heating furnace flue gas enters the air inlet pipe 201, the impurities in the heating furnace flue gas are filtered by the filter block 306, and the filter block 306 is driven to rotate in the flow channel 303 by the impact force of the heating furnace flue gas flow impacting the blade 305, the rotating block 503 is rotated in the rotating channel 502, and the centrifugal force generated by the rotation of the filter block 306 is used to shake off the impurities adhered to the surface of the filter block 306, so as to ensure the filtering effect of the filter block 306, and when the heating furnace flue gas flows through the guide block 501, the guide block 501 can guide the heating furnace flue gas due to the right-angled triangular structure of the longitudinal section of the guide block 501, so that the heating furnace flue gas can smoothly enter the collecting cylinder 304, and the impurities in the heating furnace flue gas can also be prevented from accumulating on the top surface of the collecting cylinder 304.

[0026] As a preferred embodiment, the reinforcing assembly 4 comprises a containing groove 401, a reinforcing groove 402, a reinforcing block 403 and a spring 404; two containing grooves 401 are symmetrically arranged on both sides of the connecting block 302; two reinforcing grooves 402 are symmetrically arranged on the inner wall of the connecting groove 301; the reinforcing block 403 is slidably arranged in the containing groove 401, and the reinforcing block 403 is inserted and matched with the reinforcing groove 402; the spring 404 is fixedly connected with the inner wall of the containing groove 401 and the reinforcing block 403 at two ends; the reinforcing block 403 is in a prism structure, the size of the side of the reinforcing block 403 close to the spring 404 is larger than the size of the side of the reinforcing block 403 away from the spring 404, so as to facilitate the sliding of the reinforcing block 403 in the containing groove 401 under stress, and the inclined surface of the reinforcing block 403 is in contact with the inner wall of the containing groove 401, so as to prevent the reinforcing block 403 from moving out of the containing groove 401; when the reinforcing block 403 is inserted and matched with the reinforcing groove 402, the U-shaped inclined surface of the connecting block 302 is in contact with the inner side wall of the connecting groove 301.

[0027] When the impurities in the collecting cylinder 304 are treated, the handle on the connecting block 302 is pulled, the connecting block 302 is slid in the connecting groove 301, the inclined surface of the reinforcing block 403 extrudes the inner wall of the reinforcing groove 402, the reinforcing block 403 is slid in the containing groove 401, the spring 404 is contracted under stress, until the end of the reinforcing block 403 is in contact with the inner wall of the connecting groove 301, at this time, the spring 404 is no longer contracted, until the connecting block 302 moves out of the connecting groove 301, the impurities in the inside of the collecting cylinder 304 can be cleaned, then the connecting block 302 is reinstalled, and the work can be continued.

[0028] In addition, the application also relates to a method for recovering waste heat of heating furnace flue gas, comprising the following steps: Step one: first, the heating furnace flue gas is transported into the recovery tank 1 through the inlet pipe 201, and is discharged through the exhaust pipe 202, and then the cold medium raw material is introduced into the heat exchange pipe 205 through the water inlet pipe 203, so that the cold medium raw material can be heat exchanged with the heating furnace flue gas, and then the water outlet pipe 204 is discharged, so as to realize the function of recycling the waste heat of the heating furnace flue gas; Step two: when the heating furnace flue gas enters the inlet pipe 201, the impurities in the heating furnace flue gas are filtered by the filter block 306, and the impeller 305 is impacted by the impact force of the heating furnace flue gas flow, so that the collecting cylinder 304 drives the filter block 306 to rotate in the flow channel 303 through the guide assembly 5, and the centrifugal force generated by the rotation is used to shake off the impurities adhered to the surface of the filter block 306, so as to ensure the filtering effect of the filter block 306. Step three: when the heating furnace flue gas flows through the guide block 501, the guide block 501 can guide the heating furnace flue gas to smoothly enter the collecting cylinder 304, and can also avoid the accumulation of impurities in the heating furnace flue gas on the top surface of the collecting cylinder 304. Step four: the reinforcing assembly 4 can reinforce the position of the connecting block 302 in the connecting groove 301, so as to improve the stability of the filter assembly 3 in the inlet pipe 201.

[0029] The working principle of the application is as follows: in use, first, the heating furnace flue gas is transported into the recovery tank 1 through the inlet pipe 201, and is discharged through the exhaust pipe 202, and then the cold medium raw material is introduced into the heat exchange pipe 205 through the water inlet pipe 203, so that the cold medium raw material can be heat exchanged with the heating furnace flue gas, and then the water outlet pipe 204 is discharged, so as to realize the function of recycling the waste heat of the heating furnace flue gas.

[0030] When the flue gas of the heating furnace flows through the guide block 501, the guide block 501 can guide the flue gas of the heating furnace to smoothly enter the collecting cylinder 304 due to the right-angled triangular structure of the longitudinal section of the guide block 501, and the impurities in the flue gas of the heating furnace can also be prevented from accumulating on the top surface of the collecting cylinder 304; when the impurities in the collecting cylinder 304 are treated, the handle on the connecting block 302 is pulled to make the connecting block 302 slide in the connecting groove 301, the inclined surface of the reinforcing block 403 extrudes the inner wall of the reinforcing groove 402, the reinforcing block 403 slides in the containing groove 401, the spring 404 is forced to contract, and the end of the reinforcing block 403 is in contact with the inner wall of the connecting groove 301 until the spring 404 no longer contracts until the connecting block 302 moves out of the connecting groove 301. After the impurities in the collecting cylinder 304 are cleaned, the collecting cylinder 304 is reinstalled, and the operation can be continued.

[0031] Finally, it should be pointed out that: first, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change; Secondly: the present application discloses the structure involved in the embodiment of the present application, and other structures can refer to the usual design, and in the case of no conflict, the same embodiment and different embodiments of the present application can be combined with each other; The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A heating furnace flue gas waste heat recovery device characterized by, The application relates to a heat recovery device for a heating furnace, which comprises a recovery tank (1), a waste heat recovery assembly (2) and a filter assembly (3) for recovering waste heat of heating furnace flue gas; the waste heat recovery assembly (2) is arranged on the recovery tank (1); the waste heat recovery assembly (2) comprises an air inlet pipe (201), an air outlet pipe (202), a water inlet pipe (203), a water outlet pipe (204) and a heat exchange pipe (205); the air inlet pipe (201) and the air outlet pipe (202) are fixedly arranged on the circumferential surface of the recovery tank (1) and communicate with the recovery tank (1), and the air inlet pipe (201) is provided with the filter assembly (3); the water inlet pipe (203) and the water outlet pipe (204) are fixedly connected with the recovery tank (1) and are arranged on the circumferential surface of the recovery tank (1); the heat exchange pipe (205) is arranged in the recovery tank (1), and the two ends of the heat exchange pipe (205) are fixedly connected with the water inlet pipe (203) and the water outlet pipe (204) respectively; the heat exchange pipe (205) and the heating furnace flue gas constitute a stagnant contact.

2. A heating furnace flue gas waste heat recovery device according to claim 1, characterized in that, The air inlet pipe (201) is in an L-shaped structure with a small upper part and a large lower part, and the heat exchange pipe (205) is in a spiral structure.

3. A heating furnace flue gas waste heat recovery device according to claim 2, characterized in that, The filter assembly (3) comprises a connecting groove (301), a connecting block (302), a flow-through groove (303), a collecting cylinder (304), a blade (305) and a filter block (306); the connecting groove (301) is arranged in the vertical pipe of the air inlet pipe (201); the connecting block (302) is inserted into the connecting groove (301) through a reinforcing assembly (4); the flow-through groove (303) is arranged in the connecting block (302), and the diameter of the flow-through groove (303) is matched with the inner diameter of the vertical pipe of the air inlet pipe (201); the collecting cylinder (304) is connected with the inner wall of the flow-through groove (303) through a guide assembly (5); the blades (305) are fixedly arranged on the inner circumferential surface of the collecting cylinder (304) in an annular array; and the filter block (306) is fixedly arranged in the collecting cylinder (304).

4. A heating furnace flue gas waste heat recovery device according to claim 3, characterized in that, The inner side of the connecting block (302) is a U-shaped inclined surface, the outer side is an arc surface, and the center of the connecting block (302) is located on the axis of the vertical pipe of the air inlet pipe (201).

5. A heating furnace flue gas waste heat recovery device according to claim 3, characterized in that, The collecting cylinder (304) is in a circular truncated cone structure with a large upper part and a small lower part, the filter block (306) is in a conical mesh structure, and the tip of the filter block (306) is arranged upwards.

6. A heating furnace flue gas waste heat recovery device according to claim 3, characterized in that, The reinforcing assembly (4) comprises a containing groove (401), a reinforcing groove (402), a reinforcing block (403) and a spring (404); at least two containing grooves (401) are symmetrically arranged on the two sides of the connecting block (302); at least two reinforcing grooves (402) are symmetrically arranged on the inner walls of the connecting groove (301); the reinforcing block (403) is slidably arranged in the containing groove (401), and the reinforcing block (403) is insertedly connected with the reinforcing groove (402); and the two ends of the spring (404) are fixedly connected with the inner wall of the containing groove (401) and the reinforcing block (403) respectively.

7. A heating furnace flue gas waste heat recovery device according to claim 6, characterized in that, The reinforcing block (403) is a prism structure, the size of the reinforcing block (403) near the spring (404) side is larger than the size of the reinforcing block (403) away from the spring (404) side, and the inclined surface of the reinforcing block (403) is in contact with the inner wall of the accommodating groove (401).

8. A heating furnace flue gas waste heat recovery device according to claim 5, characterized in that, The guiding assembly (5) comprises a guiding block (501), a rotating groove (502) and a rotating block (503); the guiding block (501) is fixed on the top surface of the collecting cylinder (304); the inner wall of the flow-through groove (303) is provided with the rotating groove (502); and the rotating block (503) is rotatably arranged in the rotating groove (502) and fixedly connected with the guiding block (501).

9. A heating furnace flue gas waste heat recovery device according to claim 8, characterized in that, The guiding block (501) is an annular structure, the longitudinal section of the guiding block (501) is a right triangle structure, the inclined surface of the guiding block (501) is inwardly arranged, and the outer circumferential surface of the guiding block (501) is in contact with the inner circumferential surface of the vertical pipe of the air inlet pipe (201).

10. A method for heating furnace flue gas waste heat recovery device, suitable for the heating furnace flue gas waste heat recovery device of any one of claims 1-9, characterized in that, It comprises the following steps: Step one: first, the heating furnace flue gas is transported into the recovery tank (1) through the air inlet pipe (201), and is discharged through the exhaust pipe (202), then the cold medium raw material is introduced into the heat exchange pipe (205) through the water inlet pipe (203), so that the cold medium raw material can exchange heat with the heating furnace flue gas, and then the water outlet pipe (204) is discharged, so as to realize the function of heating furnace flue gas waste heat recovery and utilization; Step two: when the heating furnace flue gas enters the air inlet pipe (201), the impurities in the heating furnace flue gas are filtered by the filter block (306), and the impeller (305) is impacted by the impact force of the heating furnace flue gas flow, so that the collecting cylinder (304) drives the filter block (306) to rotate in the flow-through groove (303) through the guiding assembly (5), and the centrifugal force generated by rotation is used to shake off the impurities adhered to the surface of the filter block (306), so as to ensure the filtering effect of the filter block (306); Step three: when the heating furnace flue gas flows through the guiding block (501), the guiding block (501) can guide the heating furnace flue gas to enter the collecting cylinder (304) smoothly, and can also avoid the accumulation of impurities in the heating furnace flue gas on the top surface of the collecting cylinder (304); Step four: the reinforcing assembly (4) can reinforce the position of the connecting block (302) in the connecting groove (301), so as to improve the stability of the filter assembly (3) in the air inlet pipe (201).

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