Waste heat recovery equipment of natural gas generator set

Abstract

The utility model discloses waste heat recovery equipment of a natural gas generator set, and belongs to the technical field of waste heat recovery of generator sets. The device comprises a recycling box, a connecting pipe used for being connected with a natural gas generator set is fixedly arranged on one side of the recycling box, baffles A are fixedly arranged in the recycling box in an up-down symmetrical mode, and a vertical plate is fixedly arranged between the baffles A; the filter cloth is arranged in the recycling box, the filter cloth is connected end to end to form a barrel shape, a cavity is formed between the filter cloth and the upper baffle A and the lower baffle A, and the cavity is divided into a heat exchange cavity and a cleaning cavity under the action of the vertical plate; according to the filter cloth cleaning device, the blowing plate is adopted to perform back-blowing cleaning on dust on the outer side of the filter cloth, the filter cloth is cleaned in a non-contact manner, the filter cloth is prevented from being damaged by friction, and the blowing plate is not influenced by abrasion, so that the problem that the cleaning effect is reduced due to abrasion of the cleaning assembly is effectively solved, and the cleaning efficiency is improved. And the cleaning effect of the cleaning assembly is prevented from being reduced due to abrasion.

Description

Technical Field

[0001] The present application relates to the technical field of waste heat recovery of generator sets, and more specifically, to a waste heat recovery device for natural gas generator sets. Background Art

[0002] In the related technology, in order to make full use of the waste heat of the natural gas generator set, for example, the patent with the prior art publication number CN221036904U provides a waste heat utilization device for a natural gas generator set. The device is provided with a cleaning component. The motor can drive the first rotating shaft to rotate, drive the rotating wheel to rotate synchronously, thereby driving the elastic belt to rotate, hitting the filter plate, cleaning the particulate impurities on the surface of the filter plate, and at the same time driving the first pulley to rotate, thereby driving the two second pulleys and the screw to rotate, and driving the second rotating shaft and the brush cylinder to move in the inner cavity of the box through the threaded block. At the same time, the brush cylinder is driven to rotate through the meshing gears and tooth plates to perform roller brushing to remove dust on the heat exchange tube to prevent impurities from accumulating on the surface of the heat exchange tube, ensure heat exchange efficiency, and facilitate cleaning.

[0003] Although the above-mentioned existing technical solution can achieve the effect of absorbing and utilizing waste heat through the heat exchange tube by cleaning the heat exchange tube and the filter plate through the cleaning component, the cleaning component relies on the friction generated by the rotation of the brush barrel for cleaning. Long-term use will reduce the cleaning effect due to wear and tear, thereby reducing the service life of the device.

[0004] In view of this, we propose a waste heat recovery device for natural gas generator sets. Utility Model Content

[0005] The purpose of this application is to provide a waste heat recovery device for a natural gas generator set, which solves the technical problem that the cleaning effect of the cleaning component is reduced due to wear, and achieves the technical effect of preventing the cleaning effect of the cleaning component from being reduced due to wear.

[0006] This application provides a waste heat recovery device for a natural gas generator set, comprising:

[0007] A recovery box, one side of which is fixedly provided with a connecting pipe for connecting to a natural gas generator set, and baffles A are fixedly provided symmetrically up and down inside the recovery box, with vertical plates fixedly provided between the baffles A;

[0008] The filter cloth is arranged inside the recovery box. The filter cloth is connected end to end in a cylindrical shape. A cavity is formed between the filter cloth and the upper and lower baffles A. The cavity is divided into a heat exchange chamber and a cleaning chamber under the action of the vertical plate;

[0009] A drive assembly is used to drive the filter cloth to operate, and the drive assembly is located inside the recovery box and outside the baffle A;

[0010] A heat exchange component, used to absorb waste heat, wherein the heat exchange component is located inside the heat exchange cavity;

[0011] The purge plate is used to clean the dust on the outside of the filter cloth, and the purge plate is located inside the cleaning chamber.

[0012] As an optional solution to the technical solution of this application document, the driving assembly includes an active roller and a driven roller, and the active roller and the driven roller are both rotatably arranged inside the recycling box and located on the outside of the baffle A. The active roller and the driven roller are linked by a transmission belt, and the transmission belt is fixedly arranged on both sides of the filter cloth. The active roller is fixedly arranged at the driving end of the driving motor, and the driving motor is fixedly arranged on the outside of the recycling box.

[0013] As an optional solution to the technical solution of this application document, baffles B are fixedly provided on the upper and lower sides of the connecting pipe inside the recovery box, and sealing rollers A and B are respectively rotatably provided on the sides of the upper and lower baffles B away from each other. The sealing rollers A and B are both tangentially provided on the outside of the filter cloth, and the sealing rollers A and B are both tangentially provided to the baffles B. The sealing rollers A and B rotate under the drive of the driving assembly.

[0014] As an optional solution to the technical solution of this application document, the driving assembly also includes a gear A, which is fixedly arranged at the end of the driven roller, and the gear A is rotatably arranged on the outside of the recycling box; a gear B is fixedly arranged at one end of the sealing roller A, and the gear B is meshed and arranged on the outside of the gear A. A pulley A is coaxially fixed on the outside of the gear B, and the pulley A is linked to the pulley B through a belt. The pulley B is coaxially connected to the sealing roller B, and a protective cover is fixed on the outside of the recycling box.

[0015] As an optional solution to the technical solution of this application document, the heat exchange assembly includes a diverter plate, and a plurality of heat exchange tubes are fixedly arranged on the outside of the diverter plate. The other ends of the heat exchange tubes are fixedly connected to the manifold plate. The outsides of the diverter plate and the manifold plate are respectively fixed with a liquid supply pipe and a liquid return pipe. The diverter plate and the manifold are both fixedly arranged on the inner side of the recovery box, and the other ends of the liquid supply pipe and the liquid return pipe are both located on the outside of the recovery box.

[0016] As an optional solution to the technical solution of the present application document, a nozzle is provided on the side of the purge plate close to the filter cloth, a blow pipe is fixedly provided on the outside of the purge plate, the other end of the blow pipe is fixedly connected to the gas tank through an electric valve, a compressor is fixedly provided on the outside of the gas tank, the gas tank and the compressor are both fixedly provided on the outside of the recovery box, a thermometer is provided on the inside of the recovery box between the baffles B, a display controller is fixedly provided inside the recovery box, and the electric valve and the thermometer are both electrically connected to the display controller.

[0017] As an optional solution to the technical solution of this application document, an isolation plate is fixedly installed on the inner side of the recycling box, the isolation plate is symmetrically arranged up and down, and a filter cloth is arranged between the isolation plate and the purge plate, a top plate is fixedly installed on the bottom of the upper isolation plate, a through hole is opened at the bottom of the recycling box, and a guide plate is fixedly installed at the bottom of the recycling box corresponding to the through hole, and the unloading end of the guide plate is located on one side of the recycling box.

[0018] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0019] (1) The present application adopts a purge plate to back-blow and clean the dust on the outside of the filter cloth, and performs non-contact cleaning on the filter cloth to prevent the filter cloth from being damaged by friction. The purge plate itself will not be affected by wear, so it effectively solves the problem of the cleaning effect of the cleaning component being reduced due to wear, thereby preventing the cleaning effect of the cleaning component from being reduced due to wear.

[0020] (2) The present application drives the filter cloth to operate in the internal transmission of the recovery box through the driving component, so that the filter cloth automatically moves to the rear of the purge plate after filtering the dust, so as to facilitate the cleaning of the dust on the outside of the filter cloth. At the same time, the filter cloth can transfer the cleaned part to the front of the heat exchange component to ensure the effectiveness of the filtering surface of the filter cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a waste heat recovery device for a natural gas generator set disclosed in a preferred embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the internal structure of a waste heat recovery device for a natural gas generator set disclosed in a preferred embodiment of the present application;

[0023] Figure 3 This is a schematic cross-sectional view of a waste heat recovery device for a natural gas generator set disclosed in a preferred embodiment of the present application;

[0024] Figure 4 This is a structural schematic diagram of a heat exchange component in a waste heat recovery device for a natural gas generator set disclosed in a preferred embodiment of the present application;

[0025] Figure 5 This is a structural diagram of a drive assembly in a waste heat recovery device for a natural gas generator set disclosed in a preferred embodiment of the present application;

[0026] Description of the numbers in the figure:

[0027] 1. Recycling box; 11. Connecting pipe; 12. Baffle A; 13. Vertical plate; 14. Isolation plate; 15. Top plate; 16. Display controller; 17. Through hole; 18. Guide plate; 19. Baffle B; 110. Exhaust pipe; 111. Protective cover;

[0028] 2. Filter cloth;

[0029] 3. Drive assembly; 31. Active roller; 32. Driven roller; 33. Drive motor; 34. Gear A;

[0030] 4. Heat exchange assembly; 41. Manifold; 42. Heat exchange tube; 43. Manifold; 44. Liquid supply pipe; 45. Liquid return pipe;

[0031] 5. Purge plate; 51. Air blow pipe; 52. Electric valve; 53. Gas tank; 54. Compressor;

[0032] 6. Sealing roller A; 61. Sealing roller B; 62. Gear B; 63. Pulley A; 64. Pulley B; 65. Belt;

[0033] 7. Thermometer. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the accompanying drawings.

[0035] Reference Figure 1 and Figure 5 The embodiment of the present application discloses a waste heat recovery device for a natural gas generator set, including a recovery box 1, a connecting pipe 11 fixedly provided on one side of the recovery box 1, a filter cloth 2 provided inside the recovery box 1, and the filter cloth 2 is connected end to end in a cylindrical shape; two baffles A12 are fixedly provided inside the recovery box 1, the two baffles A12 are symmetrically arranged up and down, and are located on the inner side of the filter cloth 2, a driving component 3 for driving the filter cloth 2 to drive the transmission operation is provided on the outer side of the two baffles A12, a cavity is formed between the two baffles A12 and the filter cloth 2, a vertical plate 13 is fixedly provided between the two baffles A12, and is used to divide the cavity into a heat exchange chamber and a cleaning chamber, a heat exchange component 4 and a purge plate 5 are respectively provided in the heat exchange chamber and the cleaning chamber inside the recovery box 1, an exhaust pipe 110 is fixedly provided on the outer side of the vertical plate 13, and the other end of the exhaust pipe 110 is located on the outer side of the recovery box 1.

[0036] When the natural gas generator set is running, the waste heat generated by it enters the interior of the recovery box 1 through the connecting pipe 11, and contacts the heat exchange component 4 after the exhaust gas is filtered by the filter cloth 2. The waste heat is absorbed and utilized by the heat exchange component 4, and the waste heat after heat exchange is discharged through the exhaust pipe 110. Since the heat exchange component 4 is arranged behind the filtering surface of the filter cloth 2, it can prevent dust from polluting the heat exchange component 4. When dust accumulates on the outside of the filter cloth 2 for a certain period of time, the drive component 3 drives the filter cloth 2 to drive and operate, so that the filter cloth 2 carries the dust to the outside of the purge plate 5 for cleaning. At the same time, the filter cloth 2 moves the cleaned part to the front of the heat exchange component 4 to ensure the smooth progress of the waste heat recovery work, and the filter cloth 2 is cleaned by blowing to prevent it from being worn out during long-term use.

[0037] In order to realize the driving function of the driving component 3 to the filter cloth 2, refer to Figure 2 、 Figure 3 and Figure 5 The driving assembly 3 includes an active roller 31 and a driven roller 32. The active roller 31 and the driven roller 32 are both rotatably arranged inside the recovery box 1 and located on the outside of the baffle A12. The active roller 31 and the driven roller 32 are linked by a transmission belt. The transmission belt is fixedly arranged on both sides of the filter cloth 2. The active roller 31 is fixedly arranged at the driving end of the driving motor 33, and the driving motor 33 is fixedly arranged on the outside of the recovery box 1.

[0038] When the driving motor 33 is running, it drives the active roller 31 to rotate, so that the active roller 31 drives the driven roller 32 to rotate through the transmission belt, and then the transmission belt drives the filter cloth 2 to transmit, so that the filter cloth 2 transfers the dust on the outside to the front of the blowing plate 5, which is convenient for subsequent cleaning.

[0039] In order to ensure the sealing between the filtering surface of the filter cloth 2 and the recovery box 1, Figure 2 、 Figure 3 and Figure 5 Inside the recovery box 1, baffles B19 are fixedly provided on the upper and lower sides of the connecting pipe 11. Sealing rollers A6 and B61 are respectively rotated and provided on the sides of the upper and lower baffles B19 away from each other. The sealing rollers A6 and B61 are both tangentially arranged on the outside of the filter cloth 2, and the sealing rollers A6 and B61 are both tangentially arranged to the baffles B19. The sealing rollers A6 and B61 rotate under the drive of the driving component 3.

[0040] When waste heat enters the recovery box 1 through the connecting pipe 11, the upper and lower layers of the filter surface are blocked by the baffle B19, and the sealing roller A6 and the sealing roller B61 are set tangent to the filter cloth 2 to ensure the sealing between the baffle B19 and the filter cloth 2, which can prevent the waste heat from dissipating in the upward and downward directions, and promote the waste heat to contact and exchange heat with the heat exchange component 4 after passing through the filter cloth 2. When the filter surface of the filter cloth 2 is cleaned and replaced, the driving component 3 drives the filter cloth 2 to transmit and at the same time drives the sealing roller A6 and the sealing roller B61 to rotate in the transmission direction of the filter cloth 2, so that the sealing roller A6 and the sealing roller B61 always seal the outside of the filter cloth 2 to ensure the sealing in front of the filter cloth 2.

[0041] In order to realize the driving function of the driving component 3 to the sealing roller A6 and the sealing roller B61, refer to Figure 1 、 Figure 2 and Figure 5The driving component 3 also includes a gear A34, which is fixedly arranged at the end of the driven roller 32, and the gear A34 is rotatably arranged on the outside of the recycling box 1; a gear B62 is fixedly arranged at one end of the sealing roller A6, and the gear B62 is meshed with the outside of the gear A34. A pulley A63 is coaxially fixed on the outside of the gear B62, and the pulley A63 is linked to the pulley B64 through a belt 65. The pulley B64 is coaxially connected to the sealing roller B61, and a protective cover 111 is fixed on the outside of the recycling box 1.

[0042] When the driven roller 32 rotates, the gear B62 is driven to rotate through the gear A34, so that the gear B62 drives the sealing roller A6 and the pulley A63 to rotate in the opposite direction of the driven roller 32. At the same time, the pulley A63 drives the pulley B64 to rotate through the belt 65, and then the pulley B64 drives the sealing roller B61 to rotate in the same direction as the sealing roller A6.

[0043] In order to achieve the heat exchange effect of the heat exchange component 4, refer to Figure 2 、 Figure 3 and Figure 4 The heat exchange component 4 includes a diverter plate 41, and several heat exchange tubes 42 are fixedly arranged on the outside of the diverter plate 41. The other ends of the heat exchange tubes 42 are fixedly connected to the convergence plate 43. A liquid supply pipe 44 and a liquid return pipe 45 are fixedly arranged on the outside of the diverter plate 41 and the convergence plate 43 respectively. The diverter plate 41 and the convergence plate 43 are fixedly arranged on the inner side of the recovery box 1, and the other ends of the liquid supply pipe 44 and the liquid return pipe 45 are located on the outside of the recovery box 1.

[0044] When the preheated water is filtered through the filter cloth 2 and contacts the heat exchange tube 42, the water source is input into the diverter plate 41 through the liquid supply pipe 44, and is diverted to the inside of the heat exchange tube 42 through the diverter plate 41. The water source inside the heat exchange tube 42 absorbs the heat and then enters the inside of the manifold 43, and is then output through the return liquid pipe 45 outside the manifold 43, thereby achieving the effect of absorbing and utilizing the waste heat.

[0045] In order to realize the cleaning function of the purge plate 5 on the filter cloth 2, refer to Figure 2 、 Figure 3 and Figure 4 A nozzle is provided on the side of the purge plate 5 close to the filter cloth 2, and an air blowing pipe 51 is fixedly provided on the outside of the purge plate 5. The other end of the air blowing pipe 51 is fixedly connected to the gas tank 53 through an electric valve 52. A compressor 54 is fixedly provided on the outside of the gas tank 53. The gas tank 53 and the compressor 54 are both fixedly provided on the outside of the recovery box 1. A thermometer 7 is provided on the inside of the recovery box 1 between the baffles B19. A display controller 16 is fixedly provided inside the recovery box 1, and the electric valve 52 and the thermometer 7 are both electrically connected to the display controller 16.

[0046] When the filter cloth 2 is filtering the waste heat normally, the thermometer 7 detects that the heat between the two baffles B19 tends to be stable. When the filtering efficiency of the filter cloth 2 decreases, the thermometer 7 can detect that the temperature is gradually rising or stabilized at a relatively high temperature, so that the display controller 16 controls the electric valve 52 to open according to the detection signal of the thermometer 7, so that the air inside the gas tank 53 is input into the interior of the purge plate 5 through the blowing pipe 51 and ejected, thereby achieving the back-blowing cleaning effect of the filter cloth 2. After cleaning, the display controller 16 controls the drive component 3 to automatically run, so that the filter cloth 2 is automatically replaced after cleaning.

[0047] In order to clean the dust blown down separately, refer to Figure 3 An isolation plate 14 is fixedly provided on the inside of the recovery box 1. The isolation plate 14 is symmetrically arranged up and down, and a filter cloth 2 is provided between the isolation plate 14 and the purge plate 5. A top plate 15 is fixedly provided at the bottom of the upper isolation plate 14. A through hole 17 is opened at the bottom of the recovery box 1. A guide plate 18 is fixedly provided at the bottom of the recovery box 1 corresponding to the through hole 17. The unloading end of the guide plate 18 is located on one side of the recovery box 1.

[0048] When the blowing plate 5 blows the dust on the outside of the filter cloth 2, the cleaned dust accumulates between the isolation plate 14 and the recovery box 1, and is discharged through the through hole 17 under the blowing of air. Under the action of the guide plate 18, the dust is transferred to the outside of the recovery box 1 to prevent the dust from accumulating inside the recovery box 1.

[0049] In summary, when the waste heat recovery device of the natural gas generator set disclosed in the embodiment of the present application is in use, the connecting pipe 11 is connected to the natural gas generator set, so that the exhaust gas of the natural gas generator set enters the interior of the recovery box 1 by itself, and contacts the heat exchange pipe 42 in the heat exchange component 4 after filtering the dust through the filter cloth 2. At this time, the water source is input into the interior of the diverter plate 41 through the liquid supply pipe 44, and is diverted to the interior of the heat exchange pipe 42 through the diverter plate 41, so that the water source inside the heat exchange pipe 42 absorbs the heat and enters the interior of the manifold 43, and then is output through the return liquid pipe 45 outside the manifold 43, so as to realize the absorption and utilization of the waste heat, and the exhaust gas after heat exchange is discharged to the outside of the recovery box 1 through the exhaust pipe 110; at this time, the thermometer 7 detects the temperature outside the filtering surface of the filter cloth 2. If the detected temperature of the thermometer 7 is within a certain range, it means that the filter cloth 2 can filter the exhaust gas normally. As the dust accumulates outside the filter cloth 2, the filtering efficiency of the filter cloth 2 gradually decreases. At this time, the thermometer 7 can detect that the temperature gradually increases or stabilizes at a relatively high temperature state;

[0050] When the display controller 16 receives the detection signal of the thermometer 7, it controls the electric valve 52 to open according to the detection signal of the thermometer 7, so that the air inside the gas tank 53 is input into the inside of the purge plate 5 through the air blowing pipe 51 and ejected, thereby achieving the back-blowing cleaning effect of the filter cloth 2. After cleaning, the display controller 16 controls the drive motor 33 to automatically run, and the drive motor 33 drives the active roller 31 to rotate, so that the active roller 31 drives the driven roller 32 to rotate through the transmission belt, and then the transmission belt drives the cleaning surface of the filter cloth 2 to transmit to the front of the heat exchange component 4. At the same time, the filter cloth 2 transfers the dust on the outside to the front of the purge plate 5 for cleaning, so as to ensure that the heat exchange component 4 can continuously recover the waste heat.

Claims

1. A waste heat recovery device for a natural gas generator set, characterized in that: Include: A recovery box (1), wherein a connection pipe (11) for connecting to a natural gas generator set is fixedly arranged on one side of the recovery box (1), baffles A (12) are fixedly arranged symmetrically up and down inside the recovery box (1), and vertical plates (13) are fixedly arranged between the baffles A (12); A filter cloth (2) is arranged inside the recovery box (1), the filter cloth (2) is connected end to end to form a cylindrical shape, a cavity is formed between the filter cloth (2) and the upper and lower baffles A (12), and the cavity is divided into a heat exchange cavity and a cleaning cavity under the action of the vertical plate (13); A driving assembly (3) for driving the filter cloth (2) to operate, wherein the driving assembly (3) is located inside the recovery box (1) and outside the baffle A (12); A heat exchange component (4) is used to absorb waste heat, and the heat exchange component (4) is located inside the heat exchange cavity; The purge plate (5) is used to clean dust on the outside of the filter cloth (2), and the purge plate (5) is located inside the cleaning chamber.

2. The waste heat recovery equipment for natural gas generator set according to claim 1 is characterized in that: The driving assembly (3) comprises an active roller (31) and a driven roller (32), wherein the active roller (31) and the driven roller (32) are both rotatably arranged inside the recovery box (1) and located outside the baffle A (12), and the active roller (31) and the driven roller (32) are linked via a transmission belt, wherein the transmission belt is fixedly arranged on both sides of the filter cloth (2), and the active roller (31) is fixedly arranged at the driving end of a driving motor (33), and the driving motor (33) is fixedly arranged outside the recovery box (1).

3. The waste heat recovery equipment for natural gas generator set according to claim 2 is characterized in that: Baffles B (19) are fixedly arranged on the upper and lower sides of the connecting pipe (11) inside the recovery box (1), and sealing rollers A (6) and B (61) are rotatably arranged on the sides of the upper and lower baffles B (19) that are away from each other. The sealing rollers A (6) and B (61) are both tangentially arranged on the outer side of the filter cloth (2), and the sealing rollers A (6) and B (61) are both tangentially arranged with the baffles B (19). The sealing rollers A (6) and B (61) are driven by the driving component (3) to rotate.

4. The waste heat recovery equipment for natural gas generator set according to claim 3 is characterized in that: The driving assembly (3) further comprises a gear A (34), wherein the gear A (34) is fixedly arranged at the end of the driven roller (32), and the gear A (34) is rotatably arranged outside the recovery box (1); a gear B (62) is fixedly arranged at one end of the sealing roller A (6), and the gear B (62) is meshedly arranged outside the gear A (34); a pulley A (63) is coaxially fixedly arranged outside the gear B (62), and the pulley A (63) is linked to the pulley B (64) through a belt (65), and the pulley B (64) is coaxially connected to the sealing roller B (61); and a protective cover (111) is fixedly arranged outside the recovery box (1).

5. The waste heat recovery equipment for natural gas generator set according to claim 1 is characterized in that: The heat exchange assembly (4) comprises a diverter plate (41), a plurality of heat exchange tubes (42) are fixedly arranged on the outside of the diverter plate (41), the other ends of the heat exchange tubes (42) are fixedly connected to a confluence plate (43), a liquid supply tube (44) and a liquid return tube (45) are fixedly arranged on the outside of the diverter plate (41) and the confluence plate (43), respectively, the diverter plate (41) and the confluence plate (43) are fixedly arranged on the inside of the recovery box (1), and the other ends of the liquid supply tube (44) and the liquid return tube (45) are located on the outside of the recovery box (1).

6. The waste heat recovery equipment for natural gas generator set according to claim 1 is characterized in that: A spray port is provided on one side of the purge plate (5) close to the filter cloth (2); an air blowing pipe (51) is fixedly provided on the outside of the purge plate (5); the other end of the air blowing pipe (51) is fixedly connected to a gas tank (53) via an electric valve (52); a compressor (54) is fixedly provided on the outside of the gas tank (53); the gas tank (53) and the compressor (54) are both fixedly provided on the outside of the recovery box (1); a thermometer (7) is provided on the inside of the recovery box (1) between the baffles B (19); a display controller (16) is fixedly provided inside the recovery box (1); the electric valve (52) and the thermometer (7) are both electrically connected to the display controller (16).

7. The waste heat recovery equipment for natural gas generator set according to claim 1, characterized in that: An isolation plate (14) is fixedly arranged on the inner side of the recovery box (1), the isolation plate (14) is symmetrically arranged up and down, and a filter cloth (2) is arranged between the isolation plate (14) and the purge plate (5), a top plate (15) is fixedly arranged on the bottom of the isolation plate (14) above, a through hole (17) is opened at the bottom of the recovery box (1), and a guide plate (18) is fixedly arranged at the bottom of the recovery box (1) corresponding to the through hole (17), and a discharge end of the guide plate (18) is located on one side of the recovery box (1).

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