A high-concentration process tail gas purification treatment device and method

Abstract

The present invention belongs to the technical field of tail gas purification, and specifically relates to a high-concentration process tail gas purification treatment device and method. Liquid nitrogen enters through a liquid nitrogen pipeline and mixes with hot nitrogen in a mixing pipeline to form low-temperature nitrogen, and enters the cold side of a main heat exchanger through a nitrogen pipeline. The process tail gas enters the main heat exchanger through an air inlet pipeline. The low-temperature nitrogen entering the main heat exchanger exchanges heat with the normal-temperature process tail gas on the hot side, flows out through a normal-temperature nitrogen pipeline, enters a pressure pipe or is discharged from a discharge pipe. The normal-temperature nitrogen enters a cold recovery heat exchanger through a pressure pipe and exchanges heat with the non-condensable gas coming out of the hot side of the main heat exchanger to recover cold. The purified non-condensable process tail gas is heated and discharged from a treatment system through a purification discharge pipeline, completing the purification treatment. The treatment cost is effectively reduced through the above process.

Description

Technical Field

[0001] The present invention belongs to the technical field of tail gas purification, and in particular relates to a device and method for purifying high-concentration process tail gas. Background Art

[0002] High-concentration process exhaust gases primarily originate from industrial production processes, particularly in the chemical, petroleum, pharmaceutical, and printing and dyeing industries, as well as certain specific processes such as spraying, printing, and rubber processing. Furthermore, waste treatment sites such as landfills and incineration plants are also sources of high-concentration exhaust gases. Typical emission characteristics of these gases are high concentration, low air volume, and large fluctuations.

[0003] Absorption is a common method for treating waste gas. Its principle is to use an absorbent (such as a liquid solvent or solid adsorbent) to absorb harmful components in the waste gas, thereby achieving waste gas purification. However, when treating high-concentration exhaust gas, the high concentration of pollutants in the exhaust gas will accelerate the consumption of the absorbent, resulting in the need for frequent replacement or regeneration of the absorbent. This not only increases treatment costs but may also affect treatment efficiency.

[0004] To this end, the present invention provides a high-concentration process tail gas purification treatment device and method. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a high-concentration process tail gas purification method described in the present invention comprises the following steps:

[0007] S1: Liquid nitrogen enters through the liquid nitrogen pipeline and mixes with the hot nitrogen in the mixing pipeline to form low-temperature nitrogen, and then enters the cold side of the main heat exchanger through the nitrogen pipeline;

[0008] S2: The process off-gas enters the main heat exchanger through the air inlet pipe. In the main heat exchanger, the water, VOCS components and non-condensable gas components in the process off-gas are cooled by the mixed low-temperature nitrogen in step S1. The water and VOCS components in the process off-gas are gradually condensed and precipitated according to the different dew point temperatures.

[0009] S3: The low-temperature nitrogen entering the main heat exchanger exchanges heat with the normal-temperature process tail gas on the hot side, flows out through the normal-temperature nitrogen pipeline, enters the pressure pipe or is discharged from the discharge pipe;

[0010] S4: Normal temperature nitrogen enters the cold recovery heat exchanger through the pressure pipe and exchanges heat with the non-condensable gas coming out of the hot side of the main heat exchanger to recover cold. The purified non-condensable process tail gas is heated and discharged from the treatment system through the purification discharge pipe, completing the purification process.

[0011] S5: The low-temperature nitrogen from the cold recovery heat exchanger is mixed with the liquid nitrogen from the liquid nitrogen pipeline. The liquid nitrogen will then gasify into low-temperature nitrogen and enter the cold side of the main heat exchanger through the nitrogen pipeline to complete the cycle.

[0012] A high-concentration process tail gas purification device also includes a heat exchange tube, which is arranged inside the cold recovery heat exchanger and is provided with a plurality of heat exchange tubes;

[0013] A cleaning pipe is provided at one end of the cold recovery heat exchanger. A pressure relief pipe is provided on the cleaning pipe. A sealing ring for sealing the heat exchange pipe is slidably installed inside the cleaning pipe. An integrated block is slidably installed on the sealing ring. An insert is provided on the integrated block. The inner wall of the insert fits the outer wall of the heat exchange pipe.

[0014] A cleaning liquid inlet pipe is provided at one end of the cleaning pipe and is used to inject the cleaning liquid into the cleaning pipe and into the heat exchange tube through the cannula;

[0015] The rotary assembly is arranged inside the cleaning pipe and is used to control the rotation of the sealing ring and enable the inserting pipe to replace the heat pipe for insertion.

[0016] A water blocking cover is provided at one end of the sealing ring close to the cleaning liquid inlet pipe. The diameter of the water blocking cover is the same as that of the sealing ring. A liquid inlet is opened at one end of the water blocking cover close to the cleaning liquid inlet pipe. One end of the cannula is connected to the inner cavity of the water blocking cover.

[0017] The rotary assembly includes a shift rod, a shift block, a shift groove and a position control assembly. The shift groove is opened inside the cleaning tube. The shift rod is fixedly installed on the top of the water blocking cover. One end of the shift rod extends into the interior of the shift groove. A plurality of shift blocks are provided. The plurality of shift blocks are arranged in a ring shape inside the shift groove.

[0018] The position control component is arranged inside the cleaning pipe and is used for controlling the movement of the water blocking cover.

[0019] The position control component includes a motor base and an electric push rod. The motor base has a built-in motor and is connected to one end of the water-blocking cover. The electric push rod is fixedly installed on the cleaning tube, and the output shaft of the cleaning tube is fixedly connected to the outer wall of the motor base.

[0020] A transmission rod is rotatably installed inside the water-blocking cover, one end of which is fixedly connected to the output shaft of the motor in the motor seat, a card block is elastically installed on the outer wall of the transmission rod, and a slot for the card block to be engaged is opened inside the water-blocking cover, and one end of the card block is tilted.

[0021] A reeling rod is rotatably installed inside the water blocking cover, a cleaning block is slidably installed inside the cannula, one end of the cleaning block is fixedly connected to a connecting rope, and the other end of the connecting rope is fixedly connected to the outer wall of the reeling rod.

[0022] A first bevel gear is fixedly mounted on the outer wall of the transmission rod, and a second bevel gear is fixedly mounted on the bottom end of the winding rod, and the first bevel gear is meshed with the second bevel gear.

[0023] One end of the winding rod extends to the interior of the transposition groove, and an annular groove for the winding rod to rotate in a circle is provided inside the transposition groove. The end of the winding rod away from the annular groove is tilted.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The present invention discloses a high-concentration process exhaust gas purification treatment device and method. The present invention adopts nitrogen as a cold source for condensing the process exhaust gas, thereby significantly reducing the heat transfer coefficient on the cold side, avoiding frost and ice blockage of the hot side process exhaust gas in a short time due to the enhanced local heat exchange effect. In addition, by using hot nitrogen and condensed non-condensable gas to recycle the cold energy, there is no frost and ice blockage on the hot side, thereby saving the defrosting energy consumption of the pre-cooling heat exchanger.

[0026] 2. The high-concentration process exhaust gas purification treatment device and method described in the present invention controls the sliding of the motor base and the water-blocking cover through an electric push rod, so that the insert tube is plugged into the heat exchange tube. The cleaning liquid enters the interior of the water-blocking cover through the liquid inlet opened on the water-blocking cover, and cooperates with the cleaning block to push into the interior of the heat exchange tube, which can further improve the cleaning effect of the heat exchange tube and effectively improve the flow rate and heat exchange efficiency of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the process flow of the tail gas purification process in the present invention;

[0029] Figure 2 It is a structural schematic diagram of the cold recovery heat exchanger in the present invention;

[0030] Figure 3 is a cross-sectional view of the cold recovery heat exchanger of the present invention;

[0031] Figure 4 In the present invention Figure 3 A magnified view of point A in the figure;

[0032] Figure 5 is a cross-sectional view of the cleaning tube of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the motor base in the present invention;

[0034] Figure 7 In the present invention Figure 6 Enlarged view of point B in FIG.

[0035] Figure 8 is a cross-sectional view of the water-blocking cover of the present invention;

[0036] Figure 9 In the present invention Figure 8 Enlarged view of point C in the figure;

[0037] Figure 10 It is a process flow chart of the present invention.

[0038] In the figure: 1. Liquid nitrogen pipeline; 2. Nitrogen pipeline; 3. Discharge pipe; 4. Main heat exchanger; 5. Pressure pipe; 6. Mixing pipe; 7. Cold recovery heat exchanger; 8. Purification discharge pipe; 9. Air inlet pipe; 10. Cleaning pipe; 11. Heat exchange pipe; 12. Electric push rod; 13. Cleaning liquid inlet pipe; 14. Pressure relief pipe; 15. Motor base; 16. Water blocking cover; 17. Liquid inlet; 18. Sealing ring; 19. Connecting rope; 20. Manifold; 21. Cleaning block; 22. Shifting rod; 23. Winding rod; 24. Shifting groove; 25. Annular groove; 26. Shift block; 27. Intubation; 28. Transmission rod; 29. ​​First bevel gear; 30. Second bevel gear; 31. Clamping block; 32. Connecting rope. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0040] like Figure 1 As shown, a high-concentration process tail gas purification method according to an embodiment of the present invention includes the following steps:

[0041] S1: Liquid nitrogen enters through the liquid nitrogen pipeline 1 and mixes with the hot nitrogen in the mixing pipeline 6 to form low-temperature nitrogen, and then enters the cold side of the main heat exchanger 4 through the nitrogen pipeline 2;

[0042] S2: The process off-gas enters the main heat exchanger 4 through the inlet pipe 9. In the main heat exchanger 4, the water, VOCS components, and non-condensable gas components in the process off-gas are cooled by the mixed low-temperature nitrogen in step S1. The water and VOCS components in the process off-gas are gradually condensed and precipitated according to the different dew point temperatures.

[0043] S3: The low-temperature nitrogen entering the main heat exchanger 4 exchanges heat with the normal-temperature process tail gas on the hot side, flows out through the normal-temperature nitrogen pipeline 2, enters the pressure pipe 5 or is discharged from the discharge pipe 3;

[0044] S4: Normal temperature nitrogen enters the cold recovery heat exchanger 7 through the pressure pipe 5 and exchanges heat with the non-condensable gas from the hot side of the main heat exchanger 4 to recover cold. The purified non-condensable process tail gas is heated and discharged from the treatment system through the purification discharge pipe 8, completing the purification process.

[0045] S5: The low-temperature nitrogen from the cold recovery heat exchanger 7 is mixed with the liquid nitrogen from the liquid nitrogen pipeline 1. The liquid nitrogen will then gasify into low-temperature nitrogen and enter the cold side of the main heat exchanger 4 through the nitrogen pipeline 2 to complete the cycle.

[0046] A high-concentration process tail gas purification device, which is suitable for the above-mentioned high-concentration process tail gas purification method, also includes a heat exchange tube 11, which is arranged inside the cold recovery heat exchanger 7 and is provided with a plurality of heat exchange tubes 11;

[0047] A cleaning pipe 10 is provided at one end of the cold recovery heat exchanger 7. A pressure relief pipe 14 is provided on the cleaning pipe 10. A sealing ring 18 for sealing the heat exchange tube 11 is slidably installed inside the cleaning pipe 10. An integrated block 20 is slidably installed on the sealing ring 18. An insert 27 is provided on the integrated block 20. The inner wall of the insert 27 is in contact with the outer wall of the heat exchange tube 11.

[0048] One end of multiple heat exchange tubes 11 extends to the interior of the clean tube 10, and the outer wall of the sealing ring 18 fits with the inner wall of the clean tube 10. Therefore, when the sealing ring 18 fits with the openings of multiple heat exchange tubes 11, the circulation of the heat exchange tube 11 will be blocked, and the integrated block 20 can slide inside the sealing ring 18 under force. There are multiple inserts 27, and multiple inserts 27 are arranged in a vertical row. The number of rows of the heat exchange tube 11 is the same as the number of inserts 27. Therefore, when a row of inserts 27 is connected to the heat exchange tube 11, the inserts 27 will be sleeved on the outer wall of the heat exchange tube 11, and the inserts 27 will also be connected to the inner cavity of the heat exchange tube 11.

[0049] The cleaning liquid inlet pipe 13 is provided at one end of the cleaning pipe 10 and is used to inject the cleaning liquid into the cleaning pipe 10 and enter the heat exchange tube 11 through the insert pipe 27;

[0050] The cleaning liquid can be delivered into the interior of the cleaning tube 10 through the cleaning liquid inlet pipe 13. At this time, the cleaning liquid will accumulate at the end of the sealing ring 18 away from the heat exchange tube 11 until the cleaning liquid is full. At this time, the cleaning liquid can be delivered to the interior of the heat exchange tube 11 through the cannula 27 for flushing. Since the number of cannulaes 27 is limited, the number of cannulae connected to the heat exchange tube 11 is limited, and the pressure will also increase. The pressurized cleaning liquid passes through the interior of the heat exchange tube 11, and the interior of the heat exchange tube 11 can be flushed.

[0051] The rotary assembly is arranged inside the cleaning pipe 10 and is used to control the rotation of the sealing ring 18 and enable the inserting pipe 27 to replace the heat pipe 11 for insertion.

[0052] The rotating assembly can be used to replace a row of heat exchange tubes 11 with a row of inserting tubes 27 for cleaning, until all heat exchange tubes 11 are connected, thus completing the cleaning of the heat exchange tubes 11 .

[0053] As a preferred embodiment of the present invention, a water-blocking cover 16 is provided at one end of the sealing ring 18 close to the cleaning liquid inlet pipe 13. The diameter of the water-blocking cover 16 is the same as the diameter of the sealing ring 18. A liquid inlet 17 is provided at one end of the water-blocking cover 16 close to the cleaning liquid inlet pipe 13, and one end of the cannula 27 is connected to the inner cavity of the water-blocking cover 16.

[0054] A liquid storage chamber is provided inside the water blocking cover 16 , and the cleaning liquid on one side of the water blocking cover 16 can enter the interior of the water blocking cover 16 through the liquid inlet 17 provided on the water blocking cover 16 , and flow from the inside of the insert 27 to the inside of the heat exchange tube 11 to complete the flushing.

[0055] As a preferred embodiment of the present invention, the rotary assembly includes a shift rod 22, a shift block 26, a shift groove 24 and a position control assembly. The shift groove 24 is opened inside the cleaning tube 10, the shift rod 22 is fixedly mounted on the top of the water blocking cover 16, and one end of the shift rod 22 extends to the inside of the shift groove 24. A plurality of shift blocks 26 are provided, and the plurality of shift blocks 26 are arranged in a ring inside the shift groove 24;

[0056] The position control assembly is disposed inside the cleaning tube 10 and is used to control the movement of the water blocking cover 16 .

[0057] The water-blocking cover 16 can be controlled to slide toward the heat exchange tube 11 through the position control component. At this time, the shifting rod 22 set at the top of the water-blocking cover 16 will also slide in the direction of the heat exchange tube 11 inside the shifting groove 24. When the shifting rod 22 slides to the gap between the two gear blocks 26, a row of inserts 27 will be plugged into a row of heat exchange tubes 11. When cleaning is completed, the water-blocking cover 16 is controlled to drive the sealing ring 18 to rotate, so that the shifting rod 22 slides along the outer wall of one of the gear blocks 26. At this time, the water-blocking cover 16 will drive the sealing ring 18 to slide in the opposite direction, and at the same time, the inserts 27 will be detached from the heat exchange tube 11 until the shifting rod 22 slides to the next gap. At this time, the integrated block 20 will drive the inserts 27 to be re-plugged into the next row of heat exchange tubes 11.

[0058] As a preferred embodiment of the present invention, the position control component includes a motor base 15 and an electric push rod 12. The motor base 15 has a built-in motor and is connected to one end of the water-blocking cover 16. The electric push rod 12 is fixedly mounted on the cleaning tube 10, and the output shaft of the cleaning tube 10 is fixedly connected to the outer wall of the motor base 15.

[0059] By controlling the sliding of the motor base 15 through the electric push rod 12 , the sliding of the water blocking cover 16 can be synchronously controlled. At this time, the rotation of the water blocking cover 16 can be controlled through the motor base 15 .

[0060] As a preferred embodiment of the present invention, a transmission rod 28 is rotatably installed inside the water-blocking cover 16, one end of the transmission rod 28 is fixedly connected to the output shaft of the motor in the motor base 15, and a clamping block 31 is elastically installed on the outer wall of the transmission rod 28. A clamping groove for the clamping block 31 is opened inside the water-blocking cover 16, and one end of the clamping block 31 is tilted.

[0061] By means of the inclined block 31, when the motor base 15 drives the transmission rod 28 to rotate counterclockwise, the water blocking cover 16 can be synchronously driven to rotate through the slot and one end of the plane of the block 31. When the motor base 15 drives the transmission rod 28 to rotate clockwise, the inclined surface provided on the block 31 can push it into the interior of the transmission rod 28. Therefore, when the motor base 15 rotates clockwise, it cannot drive the water blocking cover 16 to rotate.

[0062] As a preferred embodiment of the present invention, a winding rod 23 is rotatably installed inside the water-blocking cover 16, and a cleaning block 21 is slidably installed inside the tube 27. One end of the cleaning block 21 is fixedly connected to a connecting rope 19, and the other end of the connecting rope 19 is fixedly connected to the outer wall of the winding rod 23.

[0063] The cleaning block 21 is arranged inside the insert tube 27, and the outer wall of the cleaning block 21 does not fit with the inner wall of the insert tube 27. When the insert tube 27 is plugged into the heat exchange tube 11, the cleaning block 21 can be pushed into the interior of the heat exchange tube 11 by the water pressure in the water-blocking cover 16. The outer wall of the cleaning block 21 fits with the inner wall of the heat exchange tube 11. Therefore, when the cleaning block 21 slides inside the heat exchange tube 11, the inner wall of the heat exchange tube 11 can be further cleaned. When the cleaning block 21 slides inside the heat exchange tube 11, the winding rod 23 will rotate and unwind. By reversely controlling the rotation of the winding rod 23, the connecting rope 19 can be wound, thereby pulling out the cleaning block 21 inside the heat exchange tube 11 and returning it to the interior of the insert tube 27.

[0064] As a preferred embodiment of the present invention, a first bevel gear 29 is fixedly mounted on the outer wall of the transmission rod 28 , and a second bevel gear 30 is fixedly mounted on the bottom end of the winding rod 23 , and the first bevel gear 29 meshes with the second bevel gear 30 .

[0065] Through the cooperation between the first bevel gear 29 and the second bevel gear 30 , the winding rod 23 can be driven to rotate when the transmission rod 28 rotates.

[0066] As a preferred embodiment of the present invention, one end of the winding rod 23 extends to the inside of the transposition groove 24. The inside of the transposition groove 24 is provided with an annular groove 25 for the winding rod 23 to rotate in a circle. The end of the winding rod 23 away from the annular groove 25 is inclined.

[0067] When the insert tube 27 is plugged into the heat exchange tube 11, one end of the reeling rod 23 will slide into the inside of the annular groove 25. At this time, the second bevel gear 30 is not engaged with the first bevel gear 29. Therefore, when the cleaning liquid enters the interior of the heat exchange tube 11 through the insert tube 27, the cleaning block 21 will drive the reeling rod 23 to unwind. Since the first bevel gear 29 is not engaged with the second bevel gear 30, the rotation of the reeling rod 23 will not drive the transmission rod 28 to rotate.

[0068] When the intubation tube 27 is pulled out from the outer wall of the heat exchange tube 11, the inclined surface provided on the top of the winding rod 23 will contact one end of the annular groove 25, and slide downward inside the water blocking cover 16 by pressing, so that the second bevel gear 30 is engaged with the first bevel gear 29 (when the winding rod 23 is disengaged from the annular groove 25, the intubation tube 27 has not yet been separated from the heat exchange tube 11, and the cleaning block 21 needs to be retracted first). Synchronously, the motor base 15 is controlled to make the transmission rod 28 rotate clockwise, so that the winding rod 23 reels the connecting rope 19, and retracts the cleaning block 21 into the intubation tube 27. The transmission rod 28 is then controlled to rotate counterclockwise by the motor base 15, and the water blocking cover 16 is controlled to make one row of intubation tubes 27 switch to the next row of heat exchange tubes 11 for cleaning, and the above operation is repeated.

[0069] Working principle: The electric push rod 12 controls the motor base 15 and the water-blocking cover 16 to slide toward the heat exchange tube 11, so that the insert tube 27 is plugged into the heat exchange tube 11, and the cleaning liquid is transported to the cleaning tube 10 through the cleaning liquid inlet pipe 13. The cleaning liquid enters the interior of the water-blocking cover 16 through the liquid inlet 17 opened on the water-blocking cover 16, and flows from the inside of the insert tube 27 to the interior of the heat exchange tube 11 to complete the flushing. At the same time, the water pressure in the water-blocking cover 16 can push the cleaning block 21 into the interior of the heat exchange tube 11. Since the outer wall of the cleaning block 21 fits the inner wall of the heat exchange tube 11, when the cleaning block 21 slides inside the heat exchange tube 11, the inner wall of the heat exchange tube 11 can be further cleaned.

[0070] After the cleaning is completed, the motor seat 15 first drives the transmission rod 28 to rotate clockwise to retract the cleaning block 21, and then drives the water blocking cover 16 to rotate through the motor seat 15, so that the shift rod 22 slides along the outer wall of one of the gear blocks 26. At this time, the water blocking cover 16 will drive the sealing ring 18 to slide in the opposite direction, and at the same time make the insert 27 detach from the heat exchange tube 11 until the shift rod 22 slides to the next gap. At this time, the integrated block 20 will drive the insert 27 to re-connect with the next row of heat exchange tubes 11, and control the insert 27 to switch the next row of heat exchange tubes 11 for cleaning. By cleaning the heat exchange tubes 11, the flow rate and heat exchange efficiency can be effectively improved.

[0071] The above-mentioned front, back, left, right, up and down are all based on the Figure 1As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0072] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0073] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-concentration process tail gas purification device, characterized by: The processing method of the device comprises the following steps: S1: Liquid nitrogen enters through the liquid nitrogen pipeline (1) and mixes with the hot nitrogen in the mixing pipeline (6) to form low-temperature nitrogen, and enters the cold side of the main heat exchanger (4) through the nitrogen pipeline (2); S2: The process tail gas enters the main heat exchanger (4) through the air inlet pipe (9). In the main heat exchanger (4), the water, VOCS components and non-condensable gas components in the process tail gas are cooled by the mixed low-temperature nitrogen in step S1. The water and VOCS components in the process tail gas are gradually condensed and precipitated according to the different dew point temperatures. S3: The low-temperature nitrogen entering the main heat exchanger (4) exchanges heat with the normal-temperature process tail gas on the hot side, flows out through the normal-temperature nitrogen pipeline (2), enters the pressure pipe (5) or is discharged from the discharge pipe (3); S4: Normal temperature nitrogen enters the cold recovery heat exchanger (7) through the pressure pipe (5) and exchanges heat with the non-condensable gas coming out of the hot side of the main heat exchanger (4) to recover cold. The purified non-condensable process tail gas is heated and discharged from the treatment system through the purification discharge pipe (8), completing the purification process; S5: The low-temperature nitrogen from the cold recovery heat exchanger (7) is mixed with the liquid nitrogen from the liquid nitrogen pipeline (1). The liquid nitrogen is then gasified into low-temperature nitrogen and then enters the cold side of the main heat exchanger (4) through the nitrogen pipeline (2), completing the cycle. The high-concentration process tail gas purification treatment device comprises a heat exchange tube (11), wherein the heat exchange tube (11) is arranged inside the cold recovery heat exchanger (7), and a plurality of heat exchange tubes (11) are provided; A cleaning pipe (10), the cleaning pipe (10) is arranged at one end of the cold recovery heat exchanger (7), a pressure relief pipe (14) is arranged on the cleaning pipe (10), a sealing ring (18) for sealing the heat exchange pipe (11) is slidably installed inside the cleaning pipe (10), an integrated block (20) is slidably installed on the sealing ring (18), an insert (27) is arranged on the integrated block (20), and the inner wall of the insert (27) is in contact with the outer wall of the heat exchange pipe (11); A cleaning liquid inlet pipe (13) is provided at one end of the cleaning pipe (10) and is used to inject the cleaning liquid into the cleaning pipe (10) and enter the heat exchange pipe (11) through the insert pipe (27); A rotary assembly is arranged inside the cleaning tube (10) and is used to control the rotation of the sealing ring (18) and enable the inserting tube (27) to replace the heat pipe (11) for insertion; A water blocking cover (16) is provided at one end of the sealing ring (18) close to the cleaning liquid inlet pipe (13), the diameter of the water blocking cover (16) is the same as the diameter of the sealing ring (18), a liquid inlet (17) is provided at one end of the water blocking cover (16) close to the cleaning liquid inlet pipe (13), and one end of the cannula (27) is communicated with the inner cavity of the water blocking cover (16); A reeling rod (23) is rotatably mounted inside the water-blocking cover (16), a cleaning block (21) is slidably mounted inside the cannula (27), one end of the cleaning block (21) is fixedly connected to a connecting rope (19), and the other end of the connecting rope (19) is fixedly connected to the outer wall of the reeling rod (23).

2. The high-concentration process tail gas purification device according to claim 1, characterized in that: The rotary assembly includes a shift rod (22), a shift block (26), a shift groove (24) and a position control assembly, wherein the shift groove (24) is provided inside the cleaning tube (10), the shift rod (22) is fixedly mounted on the top of the water blocking cover (16), one end of the shift rod (22) extends to the inside of the shift groove (24), a plurality of shift blocks (26) are provided, and the plurality of shift blocks (26) are arranged in a ring shape inside the shift groove (24); The position control component is arranged inside the cleaning tube (10) and is used to control the movement of the water blocking cover (16).

3. The high-concentration process tail gas purification device according to claim 2, characterized in that: The position control component includes a motor base (15) and an electric push rod (12), wherein the motor base (15) has a built-in motor and is connected to one end of the water-blocking cover (16), and the electric push rod (12) is fixedly mounted on the cleaning tube (10), and the output shaft of the cleaning tube (10) is fixedly connected to the outer wall of the motor base (15).

4. The high-concentration process tail gas purification device according to claim 3, characterized in that: A transmission rod (28) is rotatably mounted inside the water blocking cover (16), one end of the transmission rod (28) is fixedly connected to the output shaft of the motor in the motor seat (15), a clamping block (31) is elastically mounted on the outer wall of the transmission rod (28), a clamping groove for clamping the clamping block (31) is provided inside the water blocking cover (16), and one end of the clamping block (31) is tilted.

5. The high-concentration process tail gas purification device according to claim 4, characterized in that: A first bevel gear (29) is fixedly mounted on the outer wall of the transmission rod (28), a second bevel gear (30) is fixedly mounted on the bottom end of the winding rod (23), and the first bevel gear (29) is meshed with the second bevel gear (30).

6. The high-concentration process tail gas purification device according to claim 5, characterized in that: One end of the winding rod (23) extends to the interior of the transposition groove (24), and an annular groove (25) for the winding rod (23) to rotate in a circle is provided in the transposition groove (24). One end of the winding rod (23) away from the annular groove (25) is inclined.

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