Tail gas recovery device for closed circulation pressure spray dryer

Abstract

The invention relates to the technical field of tail gas recovery, in particular to a tail gas recovery device for a closed circulating pressure spray dryer, which comprises a heat exchanger body, the heat exchanger body is provided with an inlet and an outlet, and the top end and the bottom end of the heat exchanger body are respectively and fixedly provided with an inner partition plate. An upper shell is fixedly installed at the top end of the heat exchanger body, a lower shell is fixedly installed at the bottom end of the heat exchanger body, a purifier is arranged on the lower shell, a conveying pipe is arranged on the purifier, a heat exchange pipe is arranged on the inner side of the heat exchanger body, and a top connector is formed in the top of the upper shell. According to the invention, the driving motor is controlled to operate, and the frame body is controlled to drive the plurality of salient point rollers and the plurality of shovel bodies to move, so that the plurality of salient point rollers press particles filtered on the filter plate group to the bottom of the filter plate group, and then the shovel bodies shovel off the particles, thereby preventing the particles from blocking the filter plate group, and improving the filtering effect.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas recovery, in particular to a tail gas recovery device for a closed-cycle pressure spray dryer. Background Art

[0002] A closed-cycle pressure spray dryer is a device used to convert liquid materials into dry powders. It is widely used in the food, pharmaceutical, chemical and other industries. Its working principle is to atomize the liquid material into fine droplets through spray technology, and then quickly evaporate the water in a high-temperature airflow to finally obtain a dry powder product. During the operation of the spray dryer, a large amount of exhaust gas will be emitted. In order to recycle resources, the exhaust gas generated needs to be purified and recovered through an exhaust gas recovery device.

[0003] A Chinese patent with publication number CN117717850A discloses an exhaust gas recovery device for a closed-cycle pressure spray dryer, comprising a heat exchanger, an upper cover and a lower cover, wherein a heat exchange tube is installed inside the heat exchanger through a partition, and an inlet and an outlet for introducing a heat exchange medium into the heat exchanger are respectively arranged on the side walls of the heat exchanger, and a liquid discharge port and an exhaust port are arranged on the lower cover, a filter cavity is arranged at the center of the interior of the upper cover, and a plurality of filter holes are arranged on the upper part of the side wall of the filter cavity, an elastic support structure for controlling the opening and closing of the filter holes is arranged inside the filter cavity for sliding up and down, and the elastic support structure comprises a piston, a guide tube and a spring, an air intake pipe connected to the interior of the filter cavity is fixed to the top of the upper cover, and the bottom end of the air intake pipe is always located below the piston.

[0004] The above invention can recycle organic solvents and the like in tail gas, thereby reducing resource waste and environmental pollution. At the same time, the equipment is not easily blocked and has high heat exchange efficiency.

[0005] However, the above invention has the following shortcomings: during the filtering process of particulate matter in the exhaust gas, the filter device cannot effectively perform self-cleaning work, which causes the filter device to be blocked by particulate matter and cannot normally filter the particulate matter in the exhaust gas, or the filtering effect is significantly reduced. At the same time, it is not convenient for the staff to understand whether the filter device needs to be replaced and maintained, resulting in damage to the filter device and inability to normally filter and circulate the exhaust gas, thereby reducing the filtering effect.

[0006] Therefore, the present invention provides an exhaust gas recovery device that can effectively perform self-cleaning and can warn workers to replace the filter device. Summary of the invention

[0007] Aiming at the problem that the self-cleaning effect of the exhaust gas particle filtering device in the prior art is low and the staff cannot be warned to replace the filtering device, an exhaust gas recovery device for a closed-loop pressure spray dryer is designed.

[0008] The technical solution adopted by the present invention to solve the technical problem is: an exhaust gas recovery device for a closed-cycle pressure spray dryer, comprising a heat exchanger body, the heat exchanger body is provided with an inlet and an outlet, the top and bottom ends of the heat exchanger body are respectively fixedly installed with inner baffles, the top end of the heat exchanger body is fixedly installed with an upper shell, the bottom end of the heat exchanger body is fixedly installed with a lower shell, a purifier is provided on the lower shell, a delivery pipe is provided on the purifier, a heat exchange tube is provided on the inner side of the heat exchanger body, a top interface is provided on the top of the upper shell, a top shell is fixedly installed on the top of the upper shell, and the top shell is fixedly connected to the top interface, a filter plate group is provided on the inner side of the top shell, and also includes a cleaning mechanism and a blowing mechanism; The cleaning mechanism comprises an airflow plate fixedly mounted on the inner side of the top shell, and the airflow plate is located at the bottom of the filter plate group, a driving motor is arranged on the top interface, a first roller is fixedly mounted on the output end of the driving motor, a reciprocating screw rod is arranged on the top interface through a fixed bearing, the reciprocating screw rod acts on the first roller through a belt, a frame body is threadedly mounted on the reciprocating screw rod, the frame body movably penetrates the top shell through a sealing sleeve, and a plurality of convex rollers and a plurality of shovel bodies are arranged on the frame body corresponding to the filter plate group; The blowing mechanism includes two piston cylinders fixedly mounted on the top shell, each of the piston cylinders is provided with an inlet valve and an outlet valve, a piston rod is provided on the inner side of each piston cylinder, a bracket is fixedly mounted on each piston rod, and the two brackets are fixed to the frame body together, an air shell is fixedly mounted on the upper shell body, and the air shell is connected to the two outlet valves, an air collecting chamber is connected to the air shell, a pressure valve is provided on the air collecting chamber, an air flushing port is fixedly mounted on the output end of the pressure valve, and a blowing port is fixedly mounted on each of the two shovel bodies located at the lowest end of the frame body, and two first air pipes and two second air pipes are connected to the air collecting chamber, and the two first air pipes and the two second air pipes are each movably penetrated through the top shell through a sealing sleeve.

[0009] Furthermore, the filter plate group is composed of a plurality of first filter plates, a plurality of second filter plates and a plurality of third filter plates, the filter holes of the second filter plates are slightly smaller than the filter holes of the first filter plates, and the filter holes of the third filter plates are slightly smaller than the filter holes of the second filter plates.

[0010] Furthermore, the first filter plate, the second filter plate and the third filter plate are each provided in plurality, the plurality of the first filter plates are provided with a common mounting cover, the plurality of the second filter plates are provided with a common mounting cover, and the plurality of the third filter plates are provided with a common mounting cover.

[0011] Furthermore, the convex points of the convex point roller at the corresponding position correspond to the size of the filter holes in the filter plate group, and are used to penetrate the filter holes at the corresponding position.

[0012] Furthermore, the ends of the two first air pipes are commonly connected to one of the air blowing ports, and the ends of the two second air pipes are commonly connected to another of the air blowing ports.

[0013] Furthermore, a side shell is fixedly mounted on the top shell, and a collecting tank is threadedly mounted on the bottom end of the side shell.

[0014] Furthermore, the top shell is provided with a plurality of openings, and the top shell is fixedly installed with a plurality of support bars corresponding to the openings, each of the support bars is fixedly installed with a plurality of ring bodies, each of the ring bodies is connected with a first spring, an end of the first spring is connected with a trigger block, and a plurality of trigger blocks are movably located on the inner side of the support bars, and a clamping block is fixedly installed on each of the trigger blocks.

[0015] Furthermore, a sleeve is fixedly mounted on each of the ring bodies, a second spring is connected to the inner wall of the sleeve, an end of the second spring is connected to a telescopic block adapted to the sleeve, and the telescopic block is engaged with the clamping block at the corresponding position, and a touch plate that acts on the touch block is fixedly mounted on each of the convex dot rollers.

[0016] Furthermore, the top shell is fixedly mounted with a plurality of outer covers at positions corresponding to the support bars, and the outer covers are located on the outside of the support bars at corresponding positions, each of the outer covers is provided with a plurality of rubber holsters matched with the trigger blocks, each of the outer covers is fixedly mounted with a plurality of fixing frames, and a serrated plate is movably mounted on the fixing frames.

[0017] Furthermore, a plurality of long frames are fixedly mounted on the frame body, and a sawtooth block matched with the sawtooth plate is fixedly mounted on the end of each of the long frames.

[0018] Beneficial effects of the present invention: (1) The exhaust gas recovery device for a closed-cycle pressure spray dryer described in the present invention controls the operation of a driving motor to control a frame to drive a plurality of convex rollers and a plurality of shovel bodies to move, so that the plurality of convex rollers press the particles filtered on the filter plate group to the bottom of the filter plate group, and then the shovel body shovels the particles off, thereby preventing the particles from clogging the filter plate group, thereby improving the filtering effect.

[0019] (2) The exhaust gas recovery device for a closed-cycle pressure spray dryer described in the present invention drives the piston rod and the piston cylinder to interact with each other through the movement of the frame, thereby sucking in external air and spraying it out through the air injection port and the air blowing port, thereby blowing the shoveled particles through the top shell and the side shell into the collection tank, thereby facilitating the collection and treatment of dust particles.

[0020] (3) In the exhaust gas recovery device for a closed-loop pressure spray dryer described in the present invention, when a filter plate in the filter plate group is rusted or corroded by particulate matter, particulate matter will accumulate on the filter plate, making it difficult for the convex roller to press the particulate matter to the bottom of the filter plate, so that the convex roller can only turn over the accumulated particulate matter, thereby causing the convex roller to drive the touch plate to rise, causing the touch plate to be squeezed with the touch block at the corresponding position, thereby driving the sawtooth plate to move upward through the touch block, so that when the frame moves, the long frame drives the sawtooth block to be squeezed with the sawtooth plate to produce a collision sound, which can alert the staff visually and auditorily that a filter plate at a certain location needs to be replaced and maintained, thereby playing a warning role, and improving the filtering effect by replacing the filter plate in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Figure 2 It is a schematic cross-sectional structure diagram of a heat exchanger body of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the top shell of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Figure 4 It is a schematic diagram of the explosion structure of a filter plate group of an exhaust gas recovery device for a closed-cycle pressure spray dryer of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of a piston cylinder of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Figure 6 It is a schematic diagram of the explosion structure of a frame of an exhaust gas recovery device for a closed-cycle pressure spray dryer of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of a convex drum of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of a long frame of an exhaust gas recovery device for a closed-cycle pressure spray dryer of the present invention; Fig. 9 for Figure 8A is an enlarged schematic diagram; Fig.10 It is a schematic diagram of the cross-sectional structure of an outer cover of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Fig.11 It is a schematic diagram of the cross-sectional structure of a support bar of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Fig.12 It is a schematic diagram of the explosion structure of a trigger block of a tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Fig.13 It is a schematic diagram of the three-dimensional structure of the airflow plate of the tail gas recovery device for a closed-cycle pressure spray dryer of the present invention; Fig.14 The present invention is a schematic diagram of the three-dimensional structure of the gas shell of the tail gas recovery device for the closed-cycle pressure spray dryer.

[0023] In the figure: 1, heat exchanger body; 2, inlet; 3, outlet; 4, inner partition; 5, upper shell; 6, lower shell; 7, purifier; 8, delivery pipe; 9, heat exchange tube; 10, top interface; 11, top shell; 1101, side shell; 1102, collection tank; 12, filter plate group; 13, installation cover; 14, air flow plate; 15, drive motor; 16, first roller; 17, belt; 18, reciprocating screw; 19, frame; 20, convex roller; 21, shovel body; 22, piston cylinder; 23, intake valve; 24. Piston rod; 25. Bracket; 26. Exhaust valve; 27. Air shell; 28. Air collecting chamber; 29. ​​Pressure valve; 30. Air inlet; 301. Air blowing port; 31. First air pipe; 32. Second air pipe; 33. Support bar; 34. Ring body; 35. First spring; 36. Touch block; 37. Block; 38. Shell; 39. Second spring; 40. Telescopic block; 41. Touch plate; 42. Outer cover; 43. Rubber cover; 44. Fixed frame; 45. Sawtooth plate; 46. Long frame; 47. Sawtooth block. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] like Figure 1-Figure 14As shown, an exhaust gas recovery device for a closed-cycle pressure spray dryer described in the present invention includes a heat exchanger body 1, on which an inlet 2 and an outlet 3 are provided, and inner partitions 4 are fixedly installed at the top and bottom ends of the heat exchanger body 1, an upper shell 5 is fixedly installed at the top of the heat exchanger body 1, and a lower shell 6 is fixedly installed at the bottom end of the heat exchanger body 1, a purifier 7 is provided on the lower shell 6, and a delivery pipe 8 is provided on the purifier 7, a heat exchange tube 9 is provided on the inner side of the heat exchanger body 1, a top interface 10 is provided on the top of the upper shell 5, a top shell 11 is fixedly installed on the top of the upper shell 5, and the top shell 11 is fixedly connected to the top interface 10, and a filter plate group 12 is provided on the inner side of the top shell 11.

[0026] Specifically, the inlet 2 and the outlet 3 are respectively connected to the pipeline of the external heat exchange medium equipment through connecting parts, the lower shell 6 is connected to the external liquid treatment equipment through connecting parts, the delivery pipe 8 is connected to the storage and purification gas equipment through connecting parts, and the top port 10 is connected to the exhaust pipe of the closed-cycle pressure spray dryer through connecting parts. The external heat exchange medium equipment is controlled to deliver the refrigerant to the inner side of the heat exchanger body 1 through the inlet 2, and the exhaust gas enters the inner side of the upper shell 5 through the top port 10, the top shell 11 and the filter plate group 12, and then enters the inner side of the heat exchanger body 1 through the inner partition 4, so that the heat exchange tube 9 and the refrigerant cooperate with each other to perform heat exchange on the exhaust gas. The refrigerant with increased temperature can recover heat through the outlet 3, and the organic solvent in the exhaust gas is condensed and liquefied and flows through the lower shell 6 to the external liquid treatment equipment for recycling. The remaining gas is purified by the purifier 7 and delivered by the delivery pipe 8 to the storage and purification gas equipment for recycling.

[0027] In this embodiment, the cleaning mechanism includes an airflow plate 14 fixedly mounted on the inner side of the top shell 11, and the airflow plate 14 is located at the bottom of the filter plate group 12, a driving motor 15 is arranged on the top interface 10, and a first roller 16 is fixedly mounted on the output end of the driving motor 15, a reciprocating screw 18 is arranged on the top interface 10 through a fixed bearing, and the reciprocating screw 18 acts on the first roller 16 through a belt 17, a frame 19 is threadedly mounted on the reciprocating screw 18, and the frame 19 movably penetrates the top shell 11 through a sealing sleeve, and a plurality of convex rollers 20 and a plurality of shovel bodies 21 are arranged on the frame 19 corresponding to the filter plate group 12, and the filter plate The group 12 is composed of a plurality of first filter plates, a plurality of second filter plates and a plurality of third filter plates, the filter holes of the second filter plates are slightly smaller than the filter holes of the first filter plates, the filter holes of the third filter plates are slightly smaller than the filter holes of the second filter plates, and the first filter plates, the second filter plates and the third filter plates are each provided in plurality, and a plurality of the first filter plates are jointly provided with a mounting cover 13, a plurality of the second filter plates are jointly provided with a mounting cover 13, and a plurality of the third filter plates are jointly provided with a mounting cover 13, and the convex points of the convex point roller 20 at corresponding positions correspond to the sizes of the filter holes in the filter plate group 12, and are used to penetrate the filter holes at corresponding positions.

[0028] Specifically, the airflow plate 14 can receive the particulate matter that falls on the filter plate at the lowest end of the filter plate group 12, and the exhaust gas can flow into the upper shell body 5 through the airflow plate 14. The staff controls the operation of the drive motor 15 to rotate the output end of the drive motor 15 to drive the first roller 16 to rotate, and the first roller 16 drives the reciprocating screw 18 to rotate under the action of the belt 17, and the reciprocating screw 18 drives the frame 19 to move, and the frame 19 is controlled to drive multiple convex rollers 20 and multiple shovel bodies 21 to move, so that the multiple convex rollers 20 press the particulate matter filtered on the filter plate group 12 to the bottom of the filter plate of the filter plate group 12, and then the shovel body 21 at the corresponding position shovels the particulate matter off, thereby preventing the particulate matter from clogging the filter plate group 12, thereby improving the filtering effect.

[0029] In this embodiment, the blowing mechanism includes two piston cylinders 22 fixedly mounted on the top shell 11, each of the piston cylinders 22 is provided with an inlet valve 23 and an outlet valve 26, a piston rod 24 is provided on the inner side of each piston cylinder 22, a bracket 25 is fixedly mounted on each piston rod 24, and the two brackets 25 are fixed to the frame 19 together, a gas shell 27 is fixedly mounted on the upper shell 5, and the gas shell 27 is connected to the two outlet valves 26, a gas collecting chamber 28 is connected to the gas shell 27, a pressure valve 29 is provided on the gas collecting chamber 28, and a pressure valve 29 is fixedly mounted on the output end of the pressure valve 29. The air inlet 30 is located at the two shovel bodies 21 at the lower end of the frame 19, and each of them is fixedly installed with an air blowing port 301. The air collecting chamber 28 is connected to two first air pipes 31 and two second air pipes 32, and the two first air pipes 31 and the two second air pipes 32 are each movably penetrated through the top shell 11 through a sealing sleeve, and the ends of the two first air pipes 31 are commonly connected to one of the air blowing ports 301, and the ends of the two second air pipes 32 are commonly connected to the other air blowing port 301. A side shell 1101 is fixedly installed on the top shell 11, and a collection tank 1102 is threadedly installed on the bottom end of the side shell 1101.

[0030] Specifically, the movement of the frame 19 drives the piston rod 24 and the piston cylinder 22 to interact with each other, so that the piston rod 24 draws the outside air into the piston cylinder 22 through the inlet valve 23, and then moves to the inner side of the gas shell 27 through the piston cylinder 22 and the outlet valve 26, and the gas in the gas shell 27 flows to the inner side of the gas collecting chamber 28, so that part of the gas in the gas collecting chamber 28 flows to the two blowing ports 301 through the first gas pipe 31 and the second gas pipe 32 respectively, and the two blowing ports 301 spray gas to the filter plate group 12. The particles on the lower two groups of filter plates are blown, and the amount of gas extracted exceeds the sum of the gas flowing to the first air pipe 31 and the second air pipe 32. As the air in the gas collecting chamber 28 is pressurized, when the pressure in the gas collecting chamber 28 exceeds the pressure valve 29, another part of the gas in the gas collecting chamber 28 is ejected through the air inlet 30 to blow the particles on the air flow plate 14, and all the particles are blown through the side shell 1101 and fall into the collection tank 1102, so as to facilitate the collection and treatment of dust particles; The staff regularly cleans the particulate matter collected in the collection tank 1102.

[0031] In this embodiment, the top shell 11 is provided with a plurality of openings, and the top shell 11 is fixedly installed with a plurality of support bars 33 corresponding to the openings, and each of the support bars 33 is fixedly installed with a plurality of ring bodies 34, and each of the ring bodies 34 is connected with a first spring 35, and the end of the first spring 35 is connected with a trigger block 36, and a plurality of trigger blocks 36 are movably located on the inner side of the support bar 33, and a clamping block 37 is fixedly installed on each of the trigger blocks 36, and a sleeve 38 is fixedly installed on each of the ring bodies 34, and a second spring 39 is connected to the inner wall of the sleeve 38, and the end of the second spring 39 is connected with a telescopic block 40 adapted to the sleeve 38, and the telescopic block 40 is connected to the corresponding The blocks 37 at the corresponding positions are engaged with each other, a touch plate 41 that acts on the touch block 36 is fixedly installed on each of the convex rollers 20, a plurality of outer covers 42 are fixedly installed on the top shell 11 at the positions corresponding to the support strips 33, and the outer covers 42 are located on the outside of the support strips 33 at the corresponding positions, each of the outer covers 42 is provided with a plurality of rubber leather covers 43 that are compatible with the touch block 36, a plurality of fixing frames 44 are fixedly installed on each of the outer covers 42, a serrated plate 45 is movably installed on the fixing frames 44, a plurality of long frames 46 are fixedly installed on the frame body 19, and a serrated block 47 that is compatible with the serrated plate 45 is fixedly installed at the end of each of the long frames 46.

[0032] Specifically, when a filter plate in the filter plate group 12 is rusted or corroded by particles, particles will accumulate on the filter plate, making it difficult for the convex roller 20 to press the particles to the bottom of the filter plate, so that the convex roller 20 can only turn over the accumulated particles, so that the convex roller 20 drives the touch plate 41 to rise, so that the touch plate 41 is pressed against the touch block 36 at the corresponding position, so that the touch block 36 drives the card block 37 at the corresponding position to press against the telescopic block 40 at the corresponding position, so that the telescopic block 40 moves into the inner side of the sleeve 38, so that the telescopic block 40 is no longer fixed to the touch block 36 by the card block 37, so that The first spring 35 uses its own elastic force to drive the trigger block 36 to hit the rubber cover 43 at the corresponding position. When the telescopic block 40 is separated from the clamping block 37, it moves to the initial position through the support of the elastic force of the second spring 39, so that the rubber cover 43 flips upward to drive the sawtooth plate 45 at the corresponding position to move upward, so that when the frame 19 moves, the sawtooth block 47 and the sawtooth plate 45 are squeezed by the long frame 46 to produce a collision sound, which warns the staff through vision and hearing that the filter plate at a certain place needs to be replaced and maintained, thereby playing a warning role, and the filter plate can be replaced in time to improve the filtering effect; After the filter plate is replaced, the staff presses down the sawtooth block 47 at the corresponding position, so that the sawtooth block 47 drives the clamping block 37 to clamp with the telescopic block 40 at the corresponding position, and restores the initial state.

[0033] Working principle: The staff controls the external heat exchange medium equipment to transport the refrigerant to the inner side of the heat exchanger body 1 through the inlet 2, and the exhaust gas enters the inner side of the upper shell 5 through the top interface 10, the top shell 11 and the filter plate group 12. By controlling the operation of the drive motor 15, the control frame 19 drives the multiple convex rollers 20 and the multiple shovel bodies 21 to move, so that the multiple convex rollers 20 press the particles filtered on the filter plate group 12 to the bottom of the filter plate group 12, and then the shovel body 21 shovels the particles off. The movement of the frame 19 drives the piston rod 24 and the piston cylinder 22 to interact with each other, thereby sucking The outside air is taken in and ejected through the air inlet 30 and the air blowing port 301, so that the shoveled particles are blown into the collection tank 1102 through the top shell 11 and the side shell 1101, and the exhaust gas enters the inner side of the heat exchanger body 1 through the inner partition 4, so that the heat exchange tube 9 and the refrigerant cooperate with each other to perform heat exchange on the exhaust gas, and the refrigerant with increased temperature can recover heat through the outlet 3, and the organic solvent in the exhaust gas is condensed and liquefied and flows through the lower shell 6 to the external liquid treatment equipment for recycling. The remaining gas is purified by the purifier 7 and transported by the delivery pipe 8 to the storage and purified gas equipment for recycling.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An exhaust gas recovery device for a closed-cycle pressure spray dryer, comprising a heat exchanger body (1), the heat exchanger body (1) being provided with an inlet (2) and an outlet (3), the top and bottom of the heat exchanger body (1) being fixedly mounted with inner baffles (4), the top of the heat exchanger body (1) being fixedly mounted with an upper shell (5), the bottom of the heat exchanger body (1) being fixedly mounted with a lower shell (6), the lower shell (6) being provided with a purifier (7), the purifier (7) being provided with a delivery pipe (8), the inner side of the heat exchanger body (1) being provided with a heat exchange pipe (9), the top of the upper shell (5) being provided with a top interface (10), characterized in that: A top shell (11) is fixedly mounted on the top of the upper shell (5), and the top shell (11) is fixedly connected to the top interface (10); a filter plate group (12) is arranged on the inner side of the top shell (11), and also includes a cleaning mechanism and a blowing mechanism; The cleaning mechanism comprises an airflow plate (14) fixedly mounted on the inner side of the top shell (11), and the airflow plate (14) is located at the bottom of the filter plate group (12); a driving motor (15) is arranged on the top interface (10), and a first roller (16) is fixedly mounted on the output end of the driving motor (15); a reciprocating screw (18) is arranged on the top interface (10) via a fixed bearing, and the reciprocating screw (18) interacts with the first roller (16) via a belt (17); a frame (19) is threadedly mounted on the reciprocating screw (18), and the frame (19) movably penetrates the top shell (11) via a sealing sleeve; and a plurality of convex rollers (20) and a plurality of shovel bodies (21) are arranged on the frame (19) corresponding to the filter plate group (12); The blowing mechanism comprises two piston cylinders (22) fixedly mounted on the top shell (11), each of the piston cylinders (22) being provided with an air inlet valve (23) and an air outlet valve (26), a piston rod (24) being provided on the inner side of each of the piston cylinders (22), a bracket (25) being fixedly mounted on each of the piston rods (24), and the two brackets (25) being fixedly mounted to the frame (19), an air shell (27) being fixedly mounted on the upper shell (5), and the air shell (27) being connected to the two air outlet valves (26), The gas shell (27) is connected to an air collecting chamber (28), a pressure valve (29) is provided on the air collecting chamber (28), an air injection port (30) is fixedly installed on the output end of the pressure valve (29), and an air blowing port (301) is fixedly installed on each of the two shovel bodies (21) located at the lower end of the frame (19), and two first air pipes (31) and two second air pipes (32) are connected to the air collecting chamber (28), and the two first air pipes (31) and the two second air pipes (32) are movably inserted into the top shell (11) through a sealing sleeve.

2. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 1, characterized in that: The filter plate group (12) is composed of a plurality of first filter plates, a plurality of second filter plates, and a plurality of third filter plates, wherein the filter holes of the second filter plates are slightly smaller than the filter holes of the first filter plates, and the filter holes of the third filter plates are slightly smaller than the filter holes of the second filter plates.

3. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 2, characterized in that: The first filter plate, the second filter plate and the third filter plate are each provided in plurality, the plurality of the first filter plates are provided with a mounting cover (13) in common, the plurality of the second filter plates are provided with a mounting cover (13) in common, and the plurality of the third filter plates are provided with a mounting cover (13) in common.

4. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 3, characterized in that: The convex points of the convex point roller (20) at the corresponding position correspond to the size of the filter holes in the filter plate group (12), and are used to penetrate the filter holes at the corresponding position.

5. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 4, characterized in that: The ends of the two first air pipes (31) are commonly connected to one of the air blowing ports (301), and the ends of the two second air pipes (32) are commonly connected to another of the air blowing ports (301).

6. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 5, characterized in that: A side shell (1101) is fixedly mounted on the top shell (11), and a collecting tank (1102) is threadedly mounted on the bottom end of the side shell (1101).

7. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 1, characterized in that: The top shell (11) is provided with a plurality of openings, and the top shell (11) is fixedly mounted with a plurality of support bars (33) corresponding to the openings, and each of the support bars (33) is fixedly mounted with a plurality of ring bodies (34), and each of the ring bodies (34) is connected to a first spring (35), and an end of the first spring (35) is connected to a trigger block (36), and the plurality of trigger blocks (36) are movably located on the inner side of the support bar (33), and each of the trigger blocks (36) is fixedly mounted with a clamping block (37).

8. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 7, characterized in that: A sleeve (38) is fixedly mounted on each of the ring bodies (34); a second spring (39) is connected to the inner wall of the sleeve (38); an end of the second spring (39) is connected to a telescopic block (40) adapted to the sleeve (38); the telescopic block (40) is engaged with the engaging block (37) at a corresponding position; and a touch plate (41) that interacts with the engaging block (36) is fixedly mounted on each of the convex point rollers (20).

9. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 8, characterized in that: The top shell (11) is fixedly mounted with a plurality of outer covers (42) at positions corresponding to the support bars (33), and the outer covers (42) are located outside the support bars (33) at corresponding positions, and each of the outer covers (42) is provided with a plurality of rubber covers (43) that are compatible with the trigger blocks (36), and each of the outer covers (42) is fixedly mounted with a plurality of fixing frames (44), and a sawtooth plate (45) is movably mounted on the fixing frames (44).

10. The tail gas recovery device for a closed cycle pressure spray dryer according to claim 9, characterized in that: A plurality of long frames (46) are fixedly mounted on the frame body (19), and a sawtooth block (47) adapted to the sawtooth plate (45) is fixedly mounted at the end of each of the long frames (46).

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