CN217764584U - Heat exchanger for recovering flue gas waste heat - Google Patents

Abstract

A heat exchanger for recovering flue gas waste heat comprises a flue gas inlet pipeline, a three-way piece, a grease filtering device, an ozone removing device, an inlet box, a heat exchanger body and a blow-off pipe; the device comprises a smoke inlet pipeline, a smoke outlet end, a three-way piece, a ventilation pipeline, a grease filtering device and a smoke inlet pipeline, wherein one end of the smoke inlet pipeline is connected with the smoke outlet end, the other end of the smoke inlet pipeline is connected with the first end of the three-way piece, the second end of the three-way piece is connected with the ventilation pipeline, the third end of the three-way piece is connected with an inlet of the grease filtering device, and an outlet of the grease filtering device is connected with an inlet of the ozone removing device. A heat exchanger for flue gas waste heat recovery, structural design is reasonable, the flue gas enters into the heat exchanger body through grease filter equipment, ozone removing device get rid of grease, impurity after and retrieves the heat transfer, has reduced the waste of heat energy, all is provided with the drain bottom the casing of heat exchanger body, left side buffering casing, right side buffering casing, convenient washing has improved the life of heat exchanger body, application prospect is extensive.

Description

Heat exchanger for recovering flue gas waste heat

Technical Field

The utility model relates to a heat exchanger technical field, concretely relates to a heat exchanger for flue gas waste heat recovery.

Background

The high-temperature flue gas can contain a large amount of heat in the discharging process, and the heat can be reasonably utilized by waste heat recovery. The heat exchanger is an energy-saving device for realizing heat transfer between materials between two or more than two fluids with different temperatures, and the heat is transferred from the fluid with higher temperature to the fluid with lower temperature. Therefore, the heat exchanger is often applied to the waste heat recovery of high-temperature flue gas.

A heat exchanger for flue gas waste heat recovery among the prior art has following problem: the high-temperature flue gas may carry oil smoke and impurities, and if the oil smoke and the impurities of the high-temperature flue gas enter the heat exchanger, parts in the heat exchanger can be gradually corroded and the heat exchanger can be blocked, so that the long-time use of the heat exchanger is not facilitated. Therefore, it is necessary to develop a heat exchanger for recovering waste heat of flue gas to solve the above technical problems.

Chinese patent application No. CN204944249U discloses a direct multi-tube heat exchanger for utilizing waste heat of low-temperature flue gas, which aims to make flue gas flow in a plurality of direct heat exchange tubes, and make cooling liquid pass through the heat exchange tubes, so as to ensure the minimum resistance of flue gas flow, and solve the problem that oil smoke and impurities carried by high-temperature flue gas enter the heat exchanger to corrode parts in the heat exchanger and block the heat exchanger.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome not enough, the utility model aims at providing a heat exchanger for flue gas waste heat recovery, structural design is reasonable, and the flue gas enters into the heat exchanger body after grease filter equipment, ozone removing device get rid of grease, impurity and retrieves the heat transfer, has reduced the waste of heat energy, all is provided with the drain bottom the casing of heat exchanger body, left side buffering casing, right side buffering casing, convenient washing, has improved the life of heat exchanger body, and application prospect is extensive.

The technical scheme is as follows: a heat exchanger for recovering waste heat of flue gas comprises a flue gas inlet pipeline, a three-way piece, a grease filtering device, an ozone removing device, an inlet box, a heat exchanger body and a blow-off pipe; one end of the smoke gas inlet pipeline is connected with a smoke gas outlet end, the other end of the smoke gas inlet pipeline is connected with a first end of a three-way piece, a second end of the three-way piece is connected with a vent pipeline, a third end of the three-way piece is connected with an inlet of a grease filtering device, an outlet of the grease filtering device is connected with an inlet of an ozone removing device, an outlet of the ozone removing device and one end, far away from the three-way piece, of the vent pipeline are both connected with an inlet of a gas inlet box, and the second end and the third end of the three-way piece are both provided with electric valves; the heat exchanger body comprises a shell, a heat exchange module, a left buffer shell and a right buffer shell, wherein the shell is of a rectangular structure with openings at the left end and the right end, the heat exchange module is arranged in the shell, and the heat exchange module is formed by arranging a plurality of heat exchange plates at intervals from front to back; the left side buffering casing, the right side buffering casing are respectively through fixed left side, the right side that sets up at the casing of square mouth flange, casing top surface left side, right side are provided with interface one, interface two respectively, the one end that casing was kept away from to left side buffering casing, right side buffering casing is provided with flue gas inlet interface, gas outgoing interface respectively, flue gas inlet interface and the exit linkage of inlet box, casing, left side buffering casing, right side buffering casing bottom all are provided with the drain, every the drain is connected rather than the blow off pipe that corresponds.

The utility model discloses a heat exchanger for flue gas waste heat recovery, structural design is reasonable, through setting up the tee bend spare, divide into 2 with the route that the flue gas got into the heat exchanger body, the first route is through grease filter equipment, ozone removing device, the inlet box gets into the heat exchanger body, through setting up grease filter equipment, can tentatively filter the grease in the flue gas, through ozone removing device, can further clear away impurity and grease in the flue gas, and decompose the ozone that produces, set up and prevent grease and impurity in the flue gas to get into the heat exchanger body and erode the heat transfer module in the heat exchanger body, the life of heat exchanger body is improved, another route is through the passageway of ventilating, the inlet box gets into the heat exchanger body, the route that gets into the heat exchanger body through electric valve control flue gas, when the flue gas contains grease and impurity, electric valve control flue gas gets into the heat exchanger body from the first route, when flue gas itself does not contain grease and impurity, electric valve control flue gas gets into the heat exchanger body from the first route (can keep more heat to retrieve the heat transfer); the heat in the purified flue gas is recycled and exchanged through the heat exchanger body, so that the waste of heat energy is reduced; the left buffer shell and the right buffer shell are arranged on the left side and the right side of the shell of the heat exchanger body, the left buffer shell and the right buffer shell are both of structures with narrow outer parts and wide inner parts, a good buffer area is provided for flue gas, after the flue gas enters the buffer section, the flow section is enlarged, the flow speed is reduced, and liquid distribution and process division effects are also realized on the flue gas; in order to clean the heat exchanger body conveniently, drain outlets are formed in the bottoms of the shell, the left buffering shell and the right buffering shell, the inside of the heat exchanger body is cleaned through a cleaning solvent, and then the heat exchanger body is discharged from the drain outlets and the drain pipes.

Further, in the heat exchanger for recovering the flue gas waste heat, the heat exchange medium outlet pipe and the heat exchange medium inlet pipe are respectively connected with the first connector and the second connector through the first round flange and are communicated with the inside of the shell.

Furthermore, in the heat exchanger for flue gas waste heat recovery, each heat exchange plate is formed by stacking 2 metal plates, fins are arranged and laid on the surfaces of the metal plates in parallel and are welded together by laser penetration, an internal heat exchange medium channel is formed between the metal plates and the metal plates through expansion of high-pressure fluid, and the surface of the internal heat exchange medium channel is wavy.

The metal plate sheets are welded together in a penetrating mode through laser, the pressure bearing capacity is high, the welding performance is stable, the heat exchange area capable of being accommodated in unit space is large, the surfaces of internal heat exchange medium channels of the heat exchange plate sheets are wavy, the heat transfer effect can be further enhanced through the cooperation of fins, the fins are clustered on the heat exchange plate sheets and are selected by technicians in the field according to needs, the fins can be perpendicular to the heat exchange plate sheets and can also form a certain inclination angle with the planes of the heat exchange plate sheets, and the heat transfer area of the heat exchange plate sheets is increased and the heat transfer enhancement effect is achieved.

Further, in the heat exchanger for flue gas waste heat recovery, the left end and the right end of the top of each heat exchange plate are respectively provided with the heat exchange medium outlet and the heat exchange medium inlet, the heat exchange medium outlet is sequentially communicated with the first interface and the heat exchange medium outlet pipe through the first heat exchange medium collecting pipe, and the heat exchange medium inlet is sequentially communicated with the second interface and the heat exchange medium inlet pipe through the second heat exchange medium collecting pipe.

When the heat exchanger works, a heat exchange medium sequentially enters the heat exchange medium inlet from the heat exchange medium inlet pipe, the interface II and the heat exchange medium inlet collecting pipe, flows through the heat exchange medium channel in the heat exchange plate, exchanges heat with smoke outside the heat exchange plate, recycles heat in the smoke, and is discharged from the heat exchange medium outlet, the heat exchange medium outlet collecting pipe, the interface I and the heat exchange medium outlet pipe for utilization.

Further, foretell a heat exchanger for flue gas waste heat recovery, grease filter equipment includes shell, grease filter, the detachable fixed setting of shell is at flue gas admission line middle part, a plurality of the grease filter is in the past to the inside fixed setting of shell of back interval ground.

Grease that carries the flue gas through the grease filter carries out prefilter, and the detachable setting of grease filter is convenient to wash it, change.

Further, foretell a heat exchanger for flue gas waste heat recovery, ozone removing device includes that static handles case, manganese catalysis case, active carbon filter box, the third end of tee bend spare and the access connection of static processing case, the export of static processing case passes through the access connection of pipeline with manganese catalysis case, the export of manganese catalysis case passes through the access connection of pipeline with active carbon filter box, the export of active carbon filter box passes through the access connection of pipeline with the inlet box.

Grease carried by the flue gas is further removed through the electrostatic treatment box, the manganese catalysis box and the activated carbon filter box, impurities carried by the flue gas can be removed, generated ozone can be decomposed, and the ozone is prevented from polluting surrounding air.

The utility model has the advantages that: the heat exchanger for recovering the flue gas waste heat has reasonable structural design, 2 paths for flue gas to enter the heat exchanger body are divided, and the switching can be flexibly carried out; when the smoke contains grease and impurities, the grease filtering device can be arranged to primarily filter the grease in the smoke, the ozone removing device can further remove the impurities and the grease in the smoke and decompose the generated ozone, the grease and the impurities in the smoke are prevented from entering the heat exchanger body to corrode the heat exchanger body, and the service life of the heat exchanger body is prolonged; the heat in the purified flue gas is recycled and exchanged through the heat exchanger body, so that the waste of heat energy is reduced; the bottoms of the shell, the left buffer shell and the right buffer shell are provided with drain outlets, and the interior of the heat exchanger body is cleaned by the cleaning solvent, so that the heat exchanger body is convenient to clean; through the structural improvement to the heat transfer module, improved heat transfer effect, application prospect is extensive.

Drawings

Fig. 1 is an overall plan view of the heat exchanger for flue gas waste heat recovery according to the present invention;

fig. 2 is a schematic structural view of a heat exchanger body of the heat exchanger for recovering waste heat of flue gas according to the present invention;

fig. 3 is a schematic diagram of the internal structure of the housing box of the heat exchanger for recovering the waste heat of the flue gas according to the present invention;

fig. 4 is a schematic structural view of a heat exchange plate of the heat exchanger for recovering flue gas waste heat according to the present invention;

fig. 5 is a partial cross-sectional view of a heat exchange plate of the heat exchanger for flue gas waste heat recovery according to the present invention;

fig. 6 is a sectional view of the grease filtering device of the heat exchanger for recovering the waste heat of the flue gas according to the present invention;

in the figure: the device comprises a flue gas inlet pipeline 1, a three-way piece 2, a first end 21, a second end 22, a vent pipeline 23, a third end 24, an electric valve 25, a grease filtering device 3, a shell 31, a grease filtering plate 32, an ozone removing device 4, an electrostatic treatment box 41, a manganese catalysis box 42, an activated carbon filtering box 43, an air inlet box 5, an inlet 51, an outlet 52, a heat exchanger body 6, a shell 61, a square flange 611, a first interface 612, a second interface 613, a heat exchange module 62, a heat exchange plate 621, a metal plate 6211, a fin 6212, an internal heat exchange medium channel 6213, a heat exchange medium outlet 6214, a heat exchange medium inlet 6215, a left buffering shell 63, a flue gas inlet interface 631, a right buffering shell 64, a gas discharge interface 641, a sewage discharge pipe 7, a heat exchange medium outlet pipe 8 and a heat exchange medium inlet pipe 9.

Detailed Description

The invention will be further elucidated with reference to the accompanying figures 1-6 and the specific embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The heat exchanger for recovering the waste heat of the flue gas with the structure as shown in the figures 1, 2, 3, 4, 5 and 6 comprises a flue gas inlet pipeline 1, a tee joint part 2, a grease filtering device 3, an ozone removing device 4, an air inlet box 5, a heat exchanger body 6 and a sewage discharge pipe 7; one end of the flue gas inlet pipeline 1 is connected with a flue gas outlet end, the other end of the flue gas inlet pipeline 1 is connected with a first end 21 of a three-way element 2, a second end 22 of the three-way element 2 is connected with a vent pipeline 23, a third end 24 of the three-way element 2 is connected with an inlet of a grease filtering device 3, an outlet of the grease filtering device 3 is connected with an inlet of an ozone removing device 4, an outlet of the ozone removing device 4 and one end, far away from the three-way element 2, of the vent pipeline 23 are both connected with an inlet 51 of an air inlet box 5, and the second end 22 and the third end 24 of the three-way element 2 are both provided with an electric valve 25; the heat exchanger body 6 comprises a shell 61, a heat exchange module 62, a left buffer shell 63 and a right buffer shell 64, wherein the shell 61 is of a rectangular structure with openings at the left end and the right end, the heat exchange module 62 is arranged inside the shell 61, and the heat exchange module 62 is formed by arranging a plurality of heat exchange plates 621 at intervals from front to back; left side buffering casing 63, right side buffering casing 64 are respectively through fixed setting in the left side of casing 61, right side of square mouth flange 611, casing 61 top surface left side, right side are provided with interface 612, interface two 613 respectively, the one end that casing 61 was kept away from to left side buffering casing 63, right side buffering casing 64 is provided with flue gas inlet interface 631, gas outgoing interface 641 respectively, flue gas inlet interface 631 is connected with the export 52 of inlet box 5, casing 61, left side buffering casing 63, right side buffering casing 64 bottom all are provided with the drain, every the drain is connected with its drain 7 that corresponds.

In addition, the heat exchange medium outlet pipe 8 and the heat exchange medium inlet pipe 9 are respectively connected with the first interface 612 and the second interface 613 through the first round flange 614 and are communicated with the inside of the shell 61.

Further, each of the heat exchange plate pieces 621 is formed by stacking 2 metal plate pieces 6211, and fins 6212 are laid in parallel on the surface of each metal plate piece 6211, and are welded together by laser penetration, and an internal heat exchange medium passage 6213 is formed between the metal plate piece 6211 and the metal plate piece 6211 by expansion of a high-pressure fluid, and the surface of the internal heat exchange medium passage 6213 is wavy.

Further, the left end and the right end of the top of each heat exchange plate 621 are respectively provided with a heat exchange medium outlet 6214 and a heat exchange medium inlet 6215, the heat exchange medium outlet 6214 is sequentially communicated with the first interface 612 and the heat exchange medium outlet pipe 8 through the first heat exchange medium header pipe, and the heat exchange medium inlet 6215 is sequentially communicated with the second interface 613 and the heat exchange medium inlet pipe 9 through the second heat exchange medium header pipe.

Further, grease filter 3 includes shell 31, grease filter 32, the detachable fixed setting of shell 31 is at 1 middle part of flue gas admission line, a plurality of the detachable fixed setting of interval ground is inside shell 31 after to in the past grease filter 32.

Further, the ozone removing device 4 comprises an electrostatic treatment box 41, a manganese catalysis box 42 and an activated carbon filter box 43, the third end 24 of the three-way member 2 is connected with an inlet of the electrostatic treatment box 41, an outlet of the electrostatic treatment box 41 is connected with an inlet of the manganese catalysis box 42 through a pipeline, an outlet of the manganese catalysis box 42 is connected with an inlet of the activated carbon filter box 43 through a pipeline, and an outlet of the activated carbon filter box 43 is connected with an inlet 51 of the air inlet box 5 through a pipeline.

Example 1

Based on the above structural basis, as shown in fig. 1, 2 and 3.

The utility model discloses a heat exchanger for flue gas waste heat recovery, structural design is reasonable, through setting up tee bend spare 2, divide into 2 with the route that the flue gas got into heat exchanger body 6, the first route is through grease filter equipment 3, ozone removing device 4, inlet box 5 gets into heat exchanger body 6, through setting up grease filter equipment 3, can tentatively filter the grease in the flue gas, through ozone removing device 4, can further clear away impurity and grease in the flue gas, and decompose the ozone that produces, it prevents that grease and impurity in the flue gas from getting into heat exchanger body 6 and erode heat exchanger body 6 to set up, improve heat exchanger body 6's life passageway, another route is through ventilating 23, inlet box 5 gets into heat exchanger body 6, through the route that electric valve 25 controlled flue gas got into heat exchanger body 6, when the flue gas contains grease and impurity, electric valve 25 controlled flue gas gets into heat exchanger body 6 from the first route, when the flue gas itself does not contain grease and impurity, electric valve 25 controlled flue gas gets into heat exchanger body 6 from the first route (can keep more heats to retrieve the heat transfer); the heat in the purified flue gas is recycled and exchanged through the heat exchanger body 6, so that the waste of heat energy is reduced; the left side and the right side of the shell 61 of the heat exchanger body 6 are provided with a left side buffer shell 63 and a right side buffer shell 64, the left side buffer shell 63 and the right side buffer shell 4 both adopt structures with narrow outside and wide inside, a good buffer area is provided for flue gas, after the flue gas enters the buffer section, the circulation section is enlarged, the flow speed is reduced, and the liquid distribution and the path division effects on the flue gas are also realized; in order to clean the heat exchanger body 6 conveniently, a drain is arranged at the bottom of the shell 61, the left buffer shell 63 and the right buffer shell 64, the inside of the heat exchanger body 6 is cleaned by the cleaning solvent, and then the heat exchanger body is discharged from the drain and the drain pipe 7.

Example 2

Based on the above structural basis of embodiment 1, as shown in fig. 1, 2, 3, 4, and 5.

A heat exchanger for flue gas waste heat recovery, every heat transfer plate 621 is formed by 2 stacks of metal sheet 6211 to lay fin 6212 at 6211 surface parallel arrangement of metal sheet, pierce through the welding together through the laser go on expanding through high-pressure fluid between 6211 of metal sheet and the metal sheet 6211 and form inside heat transfer medium passageway 6213, inside heat transfer medium passageway 6213 surface is wavy.

The metal plate 6211 is welded together by laser penetration, the pressure bearing capacity is high, the welding performance is stable, the heat exchange area which can be accommodated in a unit space is large, the surface of the internal heat exchange medium channel 6213 of the heat exchange plate 621 is wavy, the heat transfer effect can be further enhanced by matching fins, the form of the fins 6212 clustered on the heat exchange plate 621 is selected by a person skilled in the art according to needs, the fins can be perpendicular to the heat exchange plate 621, and can also form a certain inclination angle with the plane of the heat exchange plate 621, as long as the heat transfer area of the heat exchange plate 621 is increased, and the heat transfer enhancement effect is achieved.

During operation, heat exchange medium enters the heat exchange medium inlet 6213 in sequence from the heat exchange medium inlet pipe 5, the second interface 113 and the heat exchange medium inlet header, flows through the heat exchange medium channel 6213 inside the heat exchange plate 621, exchanges heat with flue gas outside the heat exchange plate 621, recycles heat in the flue gas, and is discharged from the heat exchange medium outlet 6214, the heat exchange medium outlet header, the first interface 612 and the heat exchange medium outlet pipe 9.

Example 3

Based on the above structural basis of embodiment 1 or embodiment 2, as shown in fig. 1 to 6.

A heat exchanger for flue gas waste heat recovery, carry out the prefilter through the grease that grease filter 32 carried to the flue gas, the detachable convenience that sets up of grease filter 32 washs, changes it.

Further, the ozone removing device 4 comprises an electrostatic treatment box 41, a manganese catalysis box 42 and an activated carbon filter box 43, grease carried by the flue gas is further removed through the electrostatic treatment box 41, the manganese catalysis box 42 and the activated carbon filter box 43, impurities carried by the flue gas can be removed, and generated ozone can be decomposed to prevent the ozone from polluting the surrounding air.

Wherein, in embodiment 1, embodiment 2, embodiment 3, grease filter 32, electrostatic treatment case 41, manganese catalysis case 42, active carbon filter 43 etc. adopt prior art can, its model, concrete structure, concrete mounted position and connected mode be the model, concrete structure, concrete mounted position and connected mode that technical staff in the field known, its structure and principle all are that this technical staff all can learn through the technical manual or learn through conventional experimental method, do not influence the utility model discloses a technical scheme's realization.

The above description is provided for the preferred embodiments of the present invention, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be implemented by various simple modifications, which all belong to the protection scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

In addition, the embodiments of the present invention can be arbitrarily combined with each other, and the same shall be regarded as the disclosure of the present invention as long as the idea of the present invention is not violated.

Claims (6)

1. A heat exchanger for recovering waste heat of flue gas is characterized by comprising a flue gas inlet pipeline (1), a three-way piece (2), a grease filtering device (3), an ozone removing device (4), an inlet box (5), a heat exchanger body (6) and a blow-off pipe (7); one end of the smoke gas inlet pipeline (1) is connected with a smoke gas outlet end, the other end of the smoke gas inlet pipeline (1) is connected with a first end (21) of a three-way piece (2), a second end (22) of the three-way piece (2) is connected with a vent pipeline (23), a third end (24) of the three-way piece (2) is connected with an inlet of a grease filtering device (3), an outlet of the grease filtering device (3) is connected with an inlet of an ozone removing device (4), an outlet of the ozone removing device (4) and one end, far away from the three-way piece (2), of the vent pipeline (23 are both connected with an inlet (51) of a gas inlet box (5), and the second end (22) and the third end (24) of the three-way piece (2) are both provided with electric valves (25); the heat exchanger body (6) comprises a shell (61), a heat exchange module (62), a left buffering shell (63) and a right buffering shell (64), wherein the shell (61) is of a rectangular structure with openings at the left end and the right end, the heat exchange module (62) is arranged in the shell (61), and the heat exchange module (62) is formed by arranging a plurality of heat exchange plates (621) at intervals from front to back; left side buffering casing (63), right side buffering casing (64) are respectively through fixed setting in left side, the right side of casing (61) of square mouth flange (611), casing (61) top surface left side, right side are provided with interface one (612), interface two (613) respectively, the one end that casing (61) were kept away from to left side buffering casing (63), right side buffering casing (64) is provided with flue gas inlet interface (631), gas outgoing interface (641) respectively, flue gas inlet interface (631) are connected with export (52) of inlet box (5), casing (61), left side buffering casing (63), right side buffering casing (64) bottom all is provided with the drain, every the drain is connected rather than drain (7) that correspond.

2. The heat exchanger for flue gas waste heat recovery according to claim 1, wherein the heat exchange medium outlet pipe (8) and the heat exchange medium inlet pipe (9) are respectively connected with the first connector (612) and the second connector (613) through a first round flange (614) and are communicated with the inside of the shell (61).

3. The heat exchanger for flue gas waste heat recovery according to claim 1, wherein each heat exchange plate (621) is formed by stacking 2 metal plates (6211), fins (6212) are laid on the surfaces of the metal plates (6211) in parallel, the metal plates (6211) are welded together by laser penetration, and an internal heat exchange medium channel (6213) is formed between the metal plates (6211) and the metal plates (6211) through expansion of high-pressure fluid, and the surface of the internal heat exchange medium channel (6213) is wavy.

4. The heat exchanger for flue gas waste heat recovery according to claim 1, wherein a heat exchange medium outlet (6214) and a heat exchange medium inlet (6215) are respectively provided at the left end and the right end of the top of each heat exchange plate (621), the heat exchange medium outlet (6214) is sequentially communicated with the first interface (612) and the heat exchange medium outlet pipe (8) through a first heat exchange medium header pipe, and the heat exchange medium inlet (6215) is sequentially communicated with the second interface (613) and the heat exchange medium inlet pipe (9) through a second heat exchange medium header pipe.

5. The heat exchanger for flue gas waste heat recovery according to claim 1, wherein the grease filtering device (3) comprises a housing (31) and grease filtering plates (32), the housing (31) is detachably and fixedly arranged in the middle of the flue gas inlet pipeline (1), and the grease filtering plates (32) are detachably and fixedly arranged inside the housing (31) from front to back at intervals.

6. The heat exchanger for flue gas waste heat recovery according to claim 1, wherein the ozone removing device (4) comprises an electrostatic treatment tank (41), a manganese catalysis tank (42) and an activated carbon filter tank (43), the third end (24) of the tee piece (2) is connected with an inlet of the electrostatic treatment tank (41), an outlet of the electrostatic treatment tank (41) is connected with an inlet of the manganese catalysis tank (42) through a pipeline, an outlet of the manganese catalysis tank (42) is connected with an inlet of the activated carbon filter tank (43) through a pipeline, and an outlet of the activated carbon filter tank (43) is connected with an inlet (51) of the air inlet tank (5) through a pipeline.

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