A tail gas adsorption tower for octafluoropropane preparation

Abstract

This invention relates to the field of tail gas adsorption tower technology, specifically a tail gas adsorption tower for octafluoropropane preparation. It mainly includes a mounting base, with an adsorption tower body fixedly mounted in the center of the top surface of the mounting base. An injection pipe is fixedly connected to the bottom of the adsorption tower body. A bottom pretreatment module, a middle adsorption module, and a top refining module are fixedly mounted on the adsorption tower body, arranged at equal distances from bottom to top. Through a detachable adsorption unit design, replacing the adsorbent does not require a complete shutdown; only the failed adsorption unit needs to be replaced individually. This avoids production line interruptions, significantly reduces downtime, and substantially improves tail gas treatment efficiency and enterprise production benefits. Simultaneously, the adsorption units are distributed equidistantly around the adsorption tower body, and with an optimized airflow path, the gas "channeling" phenomenon is reduced, ensuring full contact between the adsorbent and the tail gas, thus improving adsorption effect and treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of tail gas adsorption tower technology, specifically a tail gas adsorption tower for octafluoropropane preparation. Background Technology

[0002] Currently, the adsorbent layer in adsorption towers for octafluoropropane production mostly adopts an integral structure, where the adsorbent is directly filled into the tower body to form a continuous adsorption zone. Tail gas purification is achieved through layering different types of adsorbents; for example, the bottom layer uses alkaline adsorbent to remove HF, the middle layer uses activated carbon to adsorb fluorinated hydrocarbons, and the top layer uses modified molecular sieves to adsorb trace amounts of residual moisture in the tail gas. This structure relies on the tower's gas distribution system to allow gas to flow through the adsorbent layer, removing pollutants through physical or chemical processes. It is a commonly used tail gas treatment solution in industry.

[0003] Existing adsorption towers for octafluoropropane production have significant drawbacks in practical use: replacing the adsorbent requires a complete shutdown, leading to production line interruption and severely impacting treatment efficiency; the fixed adsorbent combination makes it difficult to adapt to the compositional differences of different batches of tail gas, resulting in unstable purification effects; the gas is prone to "channeling," causing localized adsorbent saturation and waste; and when localized adsorbent failure occurs, the entire tower needs to be treated, resulting in high maintenance costs. These problems restrict the improvement of tail gas treatment efficiency and enterprise production benefits.

[0004] Therefore, there is an urgent need to design a tail gas adsorption tower for octafluoropropane preparation to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a tail gas adsorption tower for octafluoropropane preparation, so as to solve the problems of low efficiency, unstable effect, waste and high cost caused by existing adsorption towers requiring overall shutdown when replacing adsorbents, poor compatibility of fixed adsorbent combinations, easy "channeling" of gas and the need for overall treatment of local failures.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An adsorption tower for tail gas in octafluoropropane preparation includes: a mounting base, an adsorption tower body fixedly mounted on the middle of the top surface of the mounting base, an injection pipe fixedly connected to the bottom of the adsorption tower body, a bottom pretreatment module, a middle adsorption module, and a top fine treatment module fixedly mounted on the adsorption tower body, the bottom pretreatment module, the middle adsorption module, and the top fine treatment module being arranged at equal distances from bottom to top on the adsorption tower body, and an exhaust pipe fixedly connected to the top of the adsorption tower body.

[0008] Preferably, the bottom pretreatment module, the middle adsorption module, and the top fine treatment module are sleeved on the outside of the adsorption tower body. The adsorption tower body is connected to the bottom pretreatment module, the middle adsorption module, and the top fine treatment module. The airflow inside the adsorption tower body passes through the bottom pretreatment module, the middle adsorption module, and the top fine treatment module in sequence. Each of the bottom pretreatment module, the middle adsorption module, and the top fine treatment module is equipped with a detachable adsorption unit. The adsorption units are distributed equidistantly around the adsorption tower body, and the airflow inside the adsorption tower body passes through the adsorption units.

[0009] Preferably, the adsorption tower body includes a supporting outer tube, two spliced ​​outer tubes, and a docking outer tube. One end of the supporting outer tube is fixedly connected to the top surface of the mounting base. A supporting inner tube is inserted inside the supporting outer tube. The supporting inner tube and the supporting outer tube share a central axis. One end of the supporting inner tube is fixedly connected to the top surface of the mounting base. One end of the injection tube extends into the supporting outer tube and communicates with the supporting inner tube. A buffer annular cavity is formed between the inner wall of the supporting outer tube and the outer surface of the supporting inner tube. The two spliced ​​outer tubes are located between the supporting outer tube and the docking outer tube. A spliced ​​inner tube is inserted inside the spliced ​​outer tube. The spliced ​​inner tube and the spliced ​​outer tube share a central axis. The inner wall of the spliced ​​outer tube... A transition annular cavity is formed between the inner tube and the outer surface of the splicing inner tube. An isolation ring is fixedly sleeved on the outside of the splicing inner tube. The isolation ring is located on the splicing inner tube at the end near the supporting outer tube. The end of the docking outer tube away from the splicing outer tube is connected to a tapered outer tube, which is connected to the exhaust pipe. A docking inner tube is inserted inside the docking outer tube. A flow guide cone is fixedly connected to the end of the docking inner tube away from the splicing outer tube. The bottom pretreatment module is fixedly installed in the gap between the supporting outer tube and the splicing outer tube. The middle adsorption module is fixedly installed in the gap between the two splicing outer tubes. The top fine treatment module is fixedly installed in the gap between the splicing outer tube and the docking outer tube.

[0010] Preferably, the bottom pretreatment module, the middle adsorption module, and the top fine treatment module all include a disc box. Multiple mounting holes are evenly distributed on the bottom surface of the disc box. Each mounting hole is connected to a unit cylinder, which is open at one end and closed at the other. The unit cylinder is filled with adsorbent. A docking ring is fixedly connected to the open end face of the unit cylinder, and the docking ring is inserted into the mounting hole with a threaded fit. A centering cylinder is fixedly connected to the bottom surface of the unit cylinder's inner cavity. A central tube is threaded onto the outer surface of the centering cylinder. A diversion hole is located at the bottom of the central tube. The adsorption unit consists of mounting holes, a unit cylinder and its internal adsorbent, a central tube, a diversion hole, a centering cylinder, and a docking ring. The corresponding central tube is connected to the supporting inner tube and the splicing inner tube, and the corresponding unit cylinder is connected to the buffer ring cavity and the transition ring cavity.

[0011] Preferably, the disc box has a through hole in its middle. The ends of the supporting outer tube, the splicing outer tube, and the docking outer tube are fixedly inserted into the through hole. A through tube is inserted inside the through hole. The supporting inner tube and the splicing inner tube, the splicing inner tubes, and the splicing inner tube and the docking inner tube are fixedly connected through the through tube. Multiple branch tubes are fixedly connected to the surface of the through tube, and the multiple branch tubes are radially radiating. A sealing ring is fitted around the outside of the through tube, and the ends of the branch tubes are fixedly inserted into the side of the sealing ring. The sealing ring is fixedly embedded inside the through hole, sealing... The inner wall of the mouth ring is flush with the inner wall of the insertion hole, and one end face of the sealing ring is flush with the surface of the disc box. The sealing ring is fixedly sleeved with a partition plate at its other end. The partition plate is fixedly connected to the inner wall of the disc box. The partition plate divides the inner cavity of the disc box into an inflow cavity and an outflow cavity. The inflow cavity is connected to the insertion pipe through a branch pipe, and the corresponding outflow cavity is connected to the outer bearing pipe and the splicing outer pipe. Multiple transition holes are opened on the partition plate. The multiple transition holes correspond one-to-one with the multiple mounting holes and are aligned. The unit cylinder is connected to the outflow cavity through the mounting hole, and the central pipe is connected to the inflow cavity through the transition hole.

[0012] Preferably, a short gas supply pipe is fixedly inserted into the mutually aligned mounting holes and adapter holes. One end of the short gas supply pipe inside the inflow cavity is closed, and an air-tight structure is installed on the end face of this end. The other end of the short gas supply pipe is open. A mating ring is movably inserted into the short gas supply pipe, and the two are threaded together. Multiple small gas supply holes are opened on the side of the short gas supply pipe, and the small gas supply holes are connected to the outflow cavity. An adapter hole located in the middle is opened on the end face of the short gas supply pipe, and the central pipe is connected to the adapter hole and the inflow cavity.

[0013] Preferably, an alignment sleeve is fixedly connected to the end face of the inner cavity of the gas transmission short pipe. The alignment sleeve communicates with the adapter hole. An alignment ring is fixedly connected inside the alignment sleeve. An alignment tapering hole is opened on the surface of the alignment ring away from the adapter hole. A tapping conical shell is fixedly connected to the end of the central pipe. A vent hole is opened on the surface of the tapping conical shell. The tapping conical shell is inserted into the alignment tapering hole. The surface of the tapping conical shell fits against the inner wall of the alignment tapering hole. The central pipe is slidably inserted into the centering sleeve. The vent hole communicates with the adapter hole through the inner cavity of the centering sleeve.

[0014] Preferably, the air-tight structure includes an air-tight tube, with the end face of the air supply short pipe fixedly connected to the air-tight tube. The air-tight tube is located inside the inflow cavity. An air-tight ring is fixedly connected inside the air-tight tube. A frustoconical hole is formed on the surface of the air-tight ring away from the air supply short pipe, communicating with a small adapter hole. An installation ring is provided on the end face of the air-tight tube. An installation protrusion is fixedly connected to the surface of the installation ring. The installation protrusion is movably inserted into the air-tight tube, and the two are threaded together. Multiple sector plates are fixedly connected to the inner wall of the installation ring, and buffers are fixedly connected to the ends of the sector plates. The punch has a venting slit between two adjacent sector plates. A preload spring is fixedly connected to the end face of the inner cavity of the buffer cylinder. A preload cylinder is fixedly connected to the other end of the preload spring. The preload cylinder is slidably inserted into the inside of the buffer cylinder. An air-sealing cone plug is fixedly connected to the other end of the preload cylinder. The air-sealing cone plug is adapted to the frustum-shaped hole. An actuating push rod is fixedly connected to the other side of the air-sealing cone plug. The other end of the actuating push rod passes through the frustum-shaped hole, the transition hole and extends into the centering sleeve. The tip of the punching cone shell is cut off and forms a round pushing surface. The round pushing surface contacts and connects with the end face of the actuating push rod.

[0015] Preferably, the gas transmission short pipe is provided with an anti-overflow mechanism, which includes an anti-overflow ring. The anti-overflow ring is sleeved on the outside of the gas transmission short pipe and located inside the outflow cavity. One end of the anti-overflow ring is fixedly connected to the surface of the baffle plate, and the other end of the anti-overflow ring is fixedly connected to the inner wall of the disc box. An anti-overflow one-way valve and a monitoring probe are fixedly inserted on the anti-overflow ring. The monitoring probe is electrically connected to an external terminal through a cable.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] With its detachable adsorption unit design, the entire machine can be replaced without shutting down when changing the adsorbent. Only the failed adsorption unit needs to be replaced individually, avoiding production line interruptions, significantly reducing downtime, and greatly improving exhaust gas treatment efficiency and enterprise production benefits. At the same time, the adsorption units are distributed equidistantly around the adsorption tower, and with the optimized airflow path, the gas "channeling" phenomenon is reduced, allowing the adsorbent to fully contact the exhaust gas, thereby improving the adsorption effect and treatment efficiency.

[0018] The adsorption unit can flexibly change the type and combination of adsorbents filled inside according to the differences in the composition of different batches of exhaust gas, which solves the problem of fixed adsorbent combinations in traditional adsorption towers. This flexible adaptability can ensure that the purification effect remains stable when the composition of exhaust gas changes, thus improving the reliability and adaptability of exhaust gas treatment.

[0019] When a local adsorbent fails, only the corresponding adsorption unit needs to be replaced, without the need for overall treatment of the adsorbent layer, thus reducing adsorbent waste. In addition, the monitoring probe monitors the exhaust gas treatment status in real time, making it easy to promptly identify failed adsorption units and carry out targeted maintenance and replacement, reducing the blindness and cost of maintenance, and also extending the service life of the overall adsorption tower. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the adsorption tower Figure 1 ;

[0022] Figure 3 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the adsorption tower Figure 2 ;

[0023] Figure 4 For the present invention Figure 1 A three-dimensional structural diagram of the mid-to-low-level preprocessing module;

[0024] Figure 5 For the present invention Figure 4 A schematic diagram of the split structure;

[0025] Figure 6 For the present invention Figure 5 A three-dimensional structural diagram of the middle circular box;

[0026] Figure 7 For the present invention Figure 5 A three-dimensional structural diagram of the overflow prevention mechanism;

[0027] Figure 8 For the present invention Figure 5 A three-dimensional structural diagram of the central tube;

[0028] Figure 9 For the present invention Figure 5 A three-dimensional structural diagram of the middle unit tube;

[0029] Figure 10 For the present invention Figure 5 A schematic diagram of the disassembled structure of a medium-sized gas transmission short pipeline;

[0030] Figure 11 For the present invention Figure 10 A three-dimensional structural diagram of the gas transmission orifice;

[0031] Figure 12 For the present invention Figure 10 A three-dimensional structural diagram of the center-to-center sleeve.

[0032] In the picture:

[0033] 1. Mounting base; 2. Adsorption tower body; 201. Supporting outer tube; 202. Supporting inner tube; 203. Buffer ring cavity; 204. Splicing outer tube; 205. Splicing inner tube; 206. Transition ring cavity; 207. Isolation ring; 208. Connecting outer tube; 209. Gradient outer tube; 210. Connecting inner tube; 211. Guide cone; 3. Injection pipe; 4. Bottom layer pretreatment module; 401. Disc box; 402. Mounting hole; 403. Unit cylinder; 404. Central tube; 405. Diversion hole; 406. Centering cylinder; 407. Connecting ring; 5. Middle layer adsorption module; 501. Through hole; 502. Through tube; 503. Branch tube; 504. Sealing ring; 505. Baffle plate; 506. Inflow cavity; 507. Flow... 508. Outlet; 6. Top-layer fine processing module; 601. Short gas supply pipe; 602. Gas supply orifice; 603. Adapter orifice; 7. Exhaust pipe; 701. Centering sleeve; 702. Centering ring; 703. Centering tapered hole; 704. Tapping conical shell; 705. Vent hole; 8. Air-tight structure; 801. Air-tight pipe; 802. Air-tight ring; 803. Frustum-shaped hole; 804. Mounting ring; 805. Mounting convex ring; 806. Sector plate; 807. Buffer cylinder; 808. Vent slit; 809. Preload spring; 810. Preload cylinder; 811. Air-tight cone plug; 812. Actuating push rod; 9. Anti-overflow mechanism; 901. Anti-overflow ring; 902. Anti-overflow check valve; 903. Monitoring probe. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] like Figures 1-12As shown, this application provides a tail gas adsorption tower for octafluoropropane preparation, comprising: a mounting base 1, an adsorption tower body 2 fixedly mounted on the middle of the top surface of the mounting base 1, an injection pipe 3 fixedly connected to the bottom of the adsorption tower body 2, a bottom pretreatment module 4, a middle adsorption module 5, and a top fine treatment module 6 fixedly mounted on the adsorption tower body 2, the bottom pretreatment module 4, the middle adsorption module 5, and the top fine treatment module 6 being arranged at equal distances from bottom to top on the adsorption tower body 2, and an exhaust pipe 7 fixedly connected to the top of the adsorption tower body 2.

[0037] Please see Figure 1 The bottom pretreatment module 4, the middle adsorption module 5, and the top fine treatment module 6 are mounted on the outside of the adsorption tower 2. The adsorption tower 2 is connected to the bottom pretreatment module 4, the middle adsorption module 5, and the top fine treatment module 6. The airflow inside the adsorption tower 2 passes through the bottom pretreatment module 4, the middle adsorption module 5, and the top fine treatment module 6 in sequence. Each of the bottom pretreatment module 4, the middle adsorption module 5, and the top fine treatment module 6 is equipped with a detachable adsorption unit. The adsorption units are distributed equidistantly around the adsorption tower 2. The airflow inside the adsorption tower 2 passes through the adsorption units.

[0038] With its detachable adsorption unit design, the entire machine can be replaced without shutting down the entire system. Only the failed adsorption unit needs to be replaced individually, avoiding production line interruptions, significantly reducing downtime, and greatly improving exhaust gas treatment efficiency and enterprise production benefits. At the same time, the adsorption units are distributed equidistantly around the adsorption tower 2, and with the optimized airflow path, the gas "channeling" phenomenon is reduced, allowing the adsorbent to fully contact the exhaust gas, thus improving the adsorption effect and treatment efficiency.

[0039] Please see Figure 1 , Figure 2 and Figure 3The adsorption tower body 2 includes a supporting outer tube 201, two spliced ​​outer tubes 204, and a docking outer tube 208. One end of the supporting outer tube 201 is fixedly connected to the top surface of the mounting base 1. A supporting inner tube 202 is inserted inside the supporting outer tube 201. The supporting inner tube 202 and the supporting outer tube 201 share a central axis. One end of the supporting inner tube 202 is fixedly connected to the top surface of the mounting base 1. One end of the injection pipe 3 extends into the interior of the supporting outer tube 201 and communicates with the supporting inner tube 202. A buffer annular cavity 203 is formed between the inner wall of the supporting outer tube 201 and the outer surface of the supporting inner tube 202. The two spliced ​​outer tubes 204 are located between the supporting outer tube 201 and the docking outer tube 208. A spliced ​​inner tube 205 is inserted inside the spliced ​​outer tube 204. The spliced ​​inner tube 205 and the spliced ​​outer tube 204 share a central axis. The inner wall of the spliced ​​outer tube 204... A transition annular cavity 206 is formed between the inner tube 205 and the outer surface of the splicing inner tube 205. An isolation ring 207 is fixedly sleeved on the outside of the splicing inner tube 205. The isolation ring 207 is located on the splicing inner tube 205 near the end of the supporting outer tube 201. The end of the docking outer tube 208 away from the splicing outer tube 204 is connected to a tapered outer tube 209. The tapered outer tube 209 is connected to the exhaust pipe 7. A docking inner tube 210 is inserted inside the docking outer tube 208. A guide cone 211 is fixedly connected to the end of the docking inner tube 210 away from the splicing outer tube 204. The bottom pretreatment module 4 is fixedly installed in the gap between the supporting outer tube 201 and the splicing outer tube 204. The middle adsorption module 5 is fixedly installed in the gap between the two splicing outer tubes 204. The top fine treatment module 6 is fixedly installed in the gap between the splicing outer tube 204 and the docking outer tube 208.

[0040] The adsorption tower 2 forms two independent flow channels, one for the exhaust gas before treatment and the other for the exhaust gas after treatment, to prevent the exhaust gas before and after treatment from mixing.

[0041] Please see Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 9The bottom pretreatment module 4, the middle adsorption module 5, and the top fine treatment module 6 all include a disc box 401. Multiple mounting holes 402 are evenly distributed on the bottom surface of the disc box 401. A unit cylinder 403 is connected to the bottom end of each mounting hole 402. One end of the unit cylinder 403 is open, and the other end is closed. Adsorbent is filled inside the unit cylinder 403. A mating ring 407 is fixedly connected to the open end face of the unit cylinder 403. The mating ring 407 is inserted into the mounting hole 402, and the two are threaded together. A centering cylinder 406 located in the middle is fixedly connected to the bottom surface of the inner cavity of 403. A central tube 404 is threaded onto the outside of the centering cylinder 406. A diversion hole 405 located at the bottom of the central tube 404 is opened on the surface of the central tube 404. The adsorption unit consists of a mounting hole 402, a unit cylinder 403 and its internal adsorbent, a central tube 404, a diversion hole 405, a centering cylinder 406, and a docking ring 407. The corresponding central tube 404 is connected to the bearing inner tube 202 and the splicing inner tube 205. The corresponding unit cylinder 403 is connected to the buffer ring cavity 203 and the transition ring cavity 206.

[0042] The exhaust gas enters the bottom of the unit cylinder 403 through the diversion hole 405 and flows upward along the inner cavity of the unit cylinder 403. The exhaust gas comes into full contact with the adsorbent, prolonging the contact time and improving the adsorbent's capture efficiency of pollutants in the exhaust gas.

[0043] Please see Figure 2 , Figure 4 , Figure 5 and Figure 6The disc box 401 has an insertion hole 501 in the middle. The ends of the supporting outer tube 201, the splicing outer tube 204, and the docking outer tube 208 are fixedly inserted into the insertion hole 501. An insertion tube 502 is inserted into the insertion hole 501. The supporting inner tube 202 and the splicing inner tube 205, the splicing inner tube 205 and the splicing inner tube 205, and the splicing inner tube 205 and the docking inner tube 210 are fixedly connected through the insertion tube 502. Multiple branch tubes 503 are fixedly connected to the surface of the insertion tube 502. The multiple branch tubes 503 are radially radiating. A sealing ring 504 is sleeved on the outside of the insertion tube 502. The ends of the branch tubes 503 are fixedly inserted into the side of the sealing ring 504. The sealing ring 504 is fixedly embedded in the inside of the insertion hole 501. The inner wall of the sealing ring 504 is flush with the outside of the insertion tube 502. The inner wall of the insertion hole 501 is flush with the surface of the sealing ring 504. One end face of the sealing ring 504 is flush with the surface of the disc box 401. The sealing ring 504 is fixedly sleeved with a partition plate 505 at its other end. The partition plate 505 is fixedly connected to the inner wall of the disc box 401. The partition plate 505 divides the inner cavity of the disc box 401 into an inflow cavity 506 and an outflow cavity 507. The inflow cavity 506 is connected to the insertion pipe 502 through the branch pipe 503. The corresponding outflow cavity 507 is connected to the outer bearing pipe 201 and the splicing outer pipe 204. The partition plate 505 has multiple transition holes 508. The multiple transition holes 508 correspond one-to-one with and are aligned with the multiple mounting holes 402. The unit cylinder 403 is connected to the outflow cavity 507 through the mounting hole 402. The central pipe 404 is connected to the inflow cavity 506 through the transition hole 508.

[0044] Used to separate the inner cavity of the disc box 401, so that the exhaust gas before and after purification flows separately.

[0045] Please see Figure 10 and Figure 11 A gas supply short pipe 601 is fixedly inserted into the mutually aligned mounting holes 402 and adapter holes 508. One end of the gas supply short pipe 601 inside the inflow cavity 506 is closed, and an air-sealing structure 8 is fixedly connected to the end face of this end. The other end of the gas supply short pipe 601 is open, and a mating ring 407 is movably inserted into the gas supply short pipe 601 with a threaded fit between them. Multiple gas supply holes 602 are opened on the side of the gas supply short pipe 601, and the gas supply holes 602 are connected to the outflow cavity 507. An adapter hole 603 located in the middle is opened on the end face of the gas supply short pipe 601, and the central pipe 404 is connected to the adapter hole 603 and the inflow cavity 506.

[0046] It is used to isolate the exhaust gas before and after purification, and also serves to divert the gas.

[0047] Please see Figure 8 , Figure 10 and Figure 12The end face of the inner cavity of the gas supply short pipe 601 is fixedly connected to a centering sleeve 701, which communicates with the transition hole 603. A centering ring 702 is fixedly connected inside the centering sleeve 701. A centering tapered hole 703 is opened on the surface of the centering ring 702 away from the transition hole 603. A tapping conical shell 704 is fixedly connected to the end of the central pipe 404. A vent hole 705 is opened on the surface of the tapping conical shell 704. The tapping conical shell 704 is inserted into the centering tapered hole 703, and the surface of the tapping conical shell 704 fits against the inner wall of the centering tapered hole 703. The central pipe 404 is slidably inserted into the centering sleeve 701. The vent hole 705 communicates with the transition hole 603 through the inner cavity of the centering sleeve 701.

[0048] The above structure serves as a neutralization and sealing mechanism, facilitating the accurate insertion of the central tube 404 into the centering sleeve 701, while simultaneously sealing the transmission gap between the central tube 404 and the centering sleeve 701.

[0049] Please see Figure 10 and Figure 11 The airtight structure 8 includes an airtight tube 801. The end face of the closed end of the air supply short pipe 601 is fixedly connected to the airtight tube 801. The airtight tube 801 is located inside the inflow cavity 506. An airtight ring 802 is fixedly connected inside the airtight tube 801. A frustoconical hole 803 is opened on the surface of the airtight ring 802 away from the air supply short pipe 601. The frustoconical hole 803 communicates with the transition hole 603. An installation ring 804 is covered on the end face of the airtight tube 801. An installation protrusion ring 805 is fixedly connected to the surface of the installation ring 804. The installation protrusion ring 805 is movably inserted into the airtight tube 801 and the two are threaded together. Multiple sector plates 806 are fixedly connected to the inner wall of the installation ring 804. A buffer cylinder 807 is fixedly connected to the end of the sector plate 806. A ventilation slit 808 is formed between two adjacent sector plates 806. A pre-compression spring 809 is fixedly connected to the end face of the inner cavity of the buffer cylinder 807. The pre-compression spring 809 is in a pre-compressed state. A pre-compression cylinder 810 is fixedly connected to the other end of the pre-compression spring 809. The pre-compression cylinder 810 is slidably inserted into the inside of the buffer cylinder 807. An air-sealing cone plug 811 is fixedly connected to the other end of the pre-compression cylinder 810. The air-sealing cone plug 811 is adapted to the frustum-shaped hole 803. An actuating push rod 812 is fixedly connected to the other side of the air-sealing cone plug 811. The other end of the actuating push rod 812 passes through the frustum-shaped hole 803, the transition hole 603 and extends into the centering sleeve 701. The tip of the entering conical shell 704 is cut off and forms a round push surface. The round push surface contacts and connects with the end face of the actuating push rod 812.

[0050] The air-sealing structure 8 can block the airflow channel in time when the adsorption unit is disassembled, preventing untreated exhaust gas from mixing with the treated gas and ensuring the quality of the purified exhaust gas.

[0051] Please see Figure 5and Figure 7 An anti-overflow mechanism 9 is provided on the outside of the gas supply short pipe 601. The anti-overflow mechanism 9 includes an anti-overflow ring 901, which is sleeved on the outside of the gas supply short pipe 601 and located inside the outflow chamber 507. One end of the anti-overflow ring 901 is fixedly connected to the surface of the partition plate 505, and the other end is fixedly connected to the inner wall of the disc box 401. An anti-overflow one-way valve 902 and a monitoring probe 903 are fixedly inserted into the anti-overflow ring 901. The monitoring probe 903 is electrically connected to an external terminal via a cable. The exhaust gas after adsorbent treatment enters the corresponding outflow chamber 507 through the docking ring 407, mounting hole 402, gas supply short pipe 601, gas supply hole 602, anti-overflow ring 901, and anti-overflow one-way valve 902.

[0052] The anti-overflow check valve 902 effectively prevents exhaust gas leakage during the disassembly and replacement of the adsorption unit.

[0053] The 903 monitoring probe can transmit the content of target substances in the exhaust gas to an external terminal in real time. Once the content exceeds the standard, an alarm will be issued, which will facilitate timely measures to reduce the risk of leakage of toxic and harmful gases and ensure the safety of the production environment and operators.

[0054] Working principle:

[0055] First, the exhaust gas enters the inner bearing tube 202 through the injection pipe 3. Then, the exhaust gas enters the inflow cavity 506 corresponding to the bottom pretreatment module 4 through the corresponding insertion pipe 502 and branch pipe 503. Next, the exhaust gas passes through the ventilation slit 808, the venting pipe 801, the frustum-shaped hole 803, the transition hole 603, the centering sleeve 701, the ventilation hole 705, the thrust conical shell 704, and the central tube 404, and is injected into the unit cylinder 403 through the diversion hole 405. After that, the exhaust gas flows upward inside the unit cylinder 403. Then, the adsorbent inside the unit cylinder 403 treats the exhaust gas. Finally, the treated exhaust gas... The exhaust gas passes through the docking ring 407 and mounting hole 402 into the outflow cavity 507, then enters the buffer ring cavity 203, and then enters the spliced ​​outer pipe 204 adjacent to the bearing outer pipe 201. Next, the exhaust gas passes through the corresponding spliced ​​inner pipe 205, the insertion pipe 502, and the branch pipe 503 into the inflow cavity 506 corresponding to the middle layer adsorption module 5. Then, the exhaust gas passes through the ventilation slit 808, the air-sealing pipe 801, the frustum-shaped hole 803, the transition hole 603, the centering sleeve 701, the ventilation hole 705, the thrust conical shell 704, and the central pipe 404, and is injected into the corresponding unit cylinder 4 through the diversion hole 405. Inside unit 403, the exhaust gas flows upwards. The adsorbent inside unit 403 then performs secondary treatment on the exhaust gas. After secondary treatment, the exhaust gas passes through the docking ring 407 and mounting hole 402 into the corresponding outflow cavity 507. Next, the exhaust gas enters the transition ring cavity 206, and then into another splicing outer pipe 204. The exhaust gas then passes through the corresponding splicing inner pipe 205, insertion pipe 502, and branch pipe 503 into the inflow cavity 506 corresponding to the top-layer fine treatment module 6. Finally, the exhaust gas passes through the ventilation slit 808, the air-sealing pipe 801, the frustum-shaped hole 803, and the... The exhaust gas is injected into the corresponding unit cylinder 403 through the small hole 603, the centering sleeve 701, the vent hole 705, the tapping conical shell 704, and the central tube 404, and then into the corresponding unit cylinder 403 through the diversion hole 405. After that, the exhaust gas flows upward inside the unit cylinder 403. Then, the adsorbent inside the unit cylinder 403 treats the exhaust gas three times to purify it. Then, the exhaust gas after the three treatments passes through the docking ring 407 and the mounting hole 402 and enters the corresponding outflow cavity 507. After that, the exhaust gas enters another transition ring cavity 206. Then, the exhaust gas passes through the insertion hole 501, the docking outer tube 208, the tapered outer tube 209 and is discharged from the exhaust pipe 7.

[0056] During continuous operation, the external terminal monitors the content of the target substance in the exhaust gas after each treatment in real time through the monitoring probe 903. When the content of the target substance exceeds the set value of the external terminal, the external terminal issues an audible and visual warning. Then, the personnel locate the target adsorption unit through the external terminal. After locating the target adsorption unit, the corresponding unit cylinder 403 is rotated. The unit cylinder 403 rotates along with the docking ring 407. Then, the docking ring 407 moves outward from inside the gas supply short pipe 601 under the action of the threaded engagement. Then, the unit cylinder 403, along with the central pipe 404, gradually moves away from the gas supply short pipe 601. Then, the central pipe 404 moves synchronously with the thrusting conical shell 704. Then, due to the contact between the push rod 812 and the circular push surface at the end of the thrusting conical shell 704, the pre-compression cylinder 81... Under the elastic thrust of the pre-compression spring 809, the air-sealing cone plug 811 and the trigger rod 812 move synchronously. Then, the air-sealing cone plug 811 blocks the frustum-shaped hole 803 to prevent air leakage after the adsorption unit is disassembled. Then, the trigger rod 812 separates from the circular push surface at the end of the mounting ring 804. Next, the central tube 404 and the thrust cone shell 704 are pulled out from the centering sleeve 701 in sequence. Then, the docking ring 407 separates from the gas supply short pipe 601. At this point, the adsorption unit is disassembled. At this time, the one-way flow function of the anti-overflow check valve 902 is used to prevent the exhaust gas from leaking from the opening end of the gas supply short pipe 601. Then, the adsorbent inside the unit cylinder 403 is poured out and replaced with new adsorbent. Then, the adsorption unit is put back in its original position to complete the adsorbent replacement work.

[0057] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0058] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A tail gas adsorption tower for octafluoropropane preparation, comprising: Mounting base (1), an adsorption tower (2) is fixedly mounted on the middle of the top surface of the mounting base (1), an injection pipe (3) is fixedly connected to the bottom of the adsorption tower (2), a bottom pretreatment module (4), a middle adsorption module (5), and a top fine treatment module (6) are fixedly mounted on the adsorption tower (2), the bottom pretreatment module (4), the middle adsorption module (5), and the top fine treatment module (6) are arranged at equal distances from bottom to top on the adsorption tower (2), and an exhaust pipe (7) is fixedly connected to the top of the adsorption tower (2). The characteristic feature is that... The bottom pretreatment module (4), the middle adsorption module (5), and the top fine treatment module (6) are fitted on the outside of the adsorption tower (2). The adsorption tower (2) is connected to the bottom pretreatment module (4), the middle adsorption module (5), and the top fine treatment module (6). The airflow flowing inside the adsorption tower (2) passes through the bottom pretreatment module (4), the middle adsorption module (5), and the top fine treatment module (6) in sequence. The bottom pretreatment module (4), the middle adsorption module (5), and the top fine treatment module (6) are all equipped with detachable adsorption units. The adsorption units are distributed equidistantly around the adsorption tower (2). The airflow inside the adsorption tower (2) passes through the adsorption units. The adsorption tower body (2) includes a supporting outer tube (201), two spliced ​​outer tubes (204), and a docking outer tube (208). One end of the supporting outer tube (201) is fixedly connected to the top surface of the mounting base (1). A supporting inner tube (202) is inserted inside the supporting outer tube (201). The supporting inner tube (202) and the supporting outer tube (201) share a central axis. One end of the supporting inner tube (202) is fixedly connected to the top surface of the mounting base (1). One end of the injection pipe (3) extends into the supporting outer tube (201) and communicates with the supporting inner tube (202). A buffer ring cavity (203) is formed between the inner wall of the outer supporting tube (201) and the outer surface of the inner supporting tube (202). Two spliced ​​outer tubes (204) are located between the outer supporting tube (201) and the connecting outer tube (208). A spliced ​​inner tube (205) is inserted inside the spliced ​​outer tube (204). The spliced ​​inner tube (205) and the spliced ​​outer tube (204) share the same central axis. A transition ring cavity (206) is formed between the inner wall of the spliced ​​outer tube (204) and the outer surface of the spliced ​​inner tube (205). An isolation ring (207) is fixedly sleeved on the outside of the spliced ​​inner tube (205).

2. The tail gas adsorption tower for octafluoropropane preparation according to claim 1, characterized in that, The isolation ring (207) is located on the splicing inner tube (205) at one end close to the bearing outer tube (201). The end of the docking outer tube (208) away from the splicing outer tube (204) is connected to the tapered outer tube (209). The tapered outer tube (209) is connected to the exhaust pipe (7). The docking outer tube (208) is inserted with the docking inner tube (210). The end of the docking inner tube (210) away from the splicing outer tube (204) is fixedly connected with the flow guide cone (211). The bottom pretreatment module (4) is fixedly installed in the gap between the bearing outer tube (201) and the splicing outer tube (204). The middle adsorption module (5) is fixedly installed in the gap between the two splicing outer tubes (204). The top fine treatment module (6) is fixedly installed in the gap between the splicing outer tube (204) and the docking outer tube (208).

3. The tail gas adsorption tower for octafluoropropane preparation according to claim 2, characterized in that, The bottom pretreatment module (4), the middle adsorption module (5), and the top fine treatment module (6) all include a disc box (401). Multiple mounting holes (402) are provided on the bottom surface of the disc box (401). These mounting holes (402) are evenly distributed on the bottom surface of the disc box (401). A unit cylinder (403) is connected to the bottom end of each mounting hole (402). One end of the unit cylinder (403) is open, and the other end is closed. Adsorbent is filled inside the unit cylinder (403). A mating ring (407) is fixedly connected to the open end face of the unit cylinder (403). The mating ring (407) is inserted into the mounting hole (402), and the two are threaded together. 03) A centering cylinder (406) located in the middle is fixedly connected to the bottom surface of the inner cavity. A central tube (404) is threaded onto the outside of the centering cylinder (406). A diversion hole (405) is opened on the surface of the central tube (404) at its bottom. The adsorption unit is composed of a mounting hole (402), a unit cylinder (403) and its internal adsorbent, a central tube (404), a diversion hole (405), a centering cylinder (406), and a docking ring (407). The corresponding central tube (404) is connected to the bearing inner tube (202) and the splicing inner tube (205). The corresponding unit cylinder (403) is connected to the buffer ring cavity (203) and the transition ring cavity (206).

4. The tail gas adsorption tower for octafluoropropane preparation according to claim 3, characterized in that, The disc box (401) has an insertion hole (501) in the middle. The ends of the supporting outer tube (201), the splicing outer tube (204), and the docking outer tube (208) are fixedly inserted into the insertion hole (501). An insertion tube (502) is inserted into the insertion hole (501). The supporting inner tube (202) and the splicing inner tube (205), the splicing inner tube (205) and the docking inner tube (210) are fixedly connected through the insertion tube (502). Multiple branch tubes (503) are fixedly connected to the surface of the insertion tube (502). The multiple branch tubes (503) are radially radiating. A sealing ring (504) is sleeved on the outside of the insertion tube (502). The ends of the branch tubes (503) are... The sealing ring (504) is fixedly inserted into the side of the sealing ring (504). The sealing ring (504) is fixedly embedded in the inside of the through hole (501). The inner wall of the sealing ring (504) is flush with the inner wall of the through hole (501). One end face of the sealing ring (504) is flush with the surface of the disc box (401). The sealing ring (504) is fixedly sleeved with a partition plate (505) located at its other end. The partition plate (505) is fixedly connected to the inner wall of the disc box (401). The partition plate (505) divides the inner cavity of the disc box (401) into an inflow cavity (506) and an outflow cavity (507). The inflow cavity (506) is connected to the through pipe (502) through the branch pipe (503). The corresponding outflow cavity (507) is connected to the bearing outer pipe (201) and the splicing outer pipe (204).

5. The tail gas adsorption tower for octafluoropropane preparation according to claim 4, characterized in that, The partition plate (505) has multiple transition holes (508), which correspond to and are aligned with multiple mounting holes (402). The unit cylinder (403) is connected to the outflow cavity (507) through the mounting hole (402), and the central tube (404) is connected to the inflow cavity (506) through the transition hole (508).

6. The tail gas adsorption tower for octafluoropropane preparation according to claim 5, characterized in that, A gas supply short pipe (601) is fixedly inserted into the mutually aligned mounting hole (402) and adapter hole (508). One end of the gas supply short pipe (601) inside the inflow cavity (506) is closed, and an air-tight structure (8) is fixedly connected to the end face of this end. The other end of the gas supply short pipe (601) is open, and a mating ring (407) is movably inserted into the gas supply short pipe (601) and the two are threaded together. Multiple gas supply holes (602) are opened on the side of the gas supply short pipe (601), and the gas supply holes (602) are connected to the outflow cavity (507). An adapter hole (603) located in the middle is opened on the end face of the gas supply short pipe (601), and the central pipe (404) is connected to the adapter hole (603) and the inflow cavity (506).

7. The tail gas adsorption tower for octafluoropropane preparation according to claim 6, characterized in that, A centering sleeve (701) is fixedly connected to the end face of the inner cavity of the gas transmission short pipe (601). The centering sleeve (701) communicates with the adapter hole (603). A centering ring (702) is fixedly connected inside the centering sleeve (701). A centering tapered hole (703) is opened on the surface of the centering ring (702) away from the adapter hole (603). A tapping conical shell is fixedly connected to the end of the central pipe (404). (704) A vent hole (705) is provided on the surface of the tapping conical shell (704). The tapping conical shell (704) is inserted into the centering tapered hole (703). The surface of the tapping conical shell (704) is in contact with the inner wall of the centering tapered hole (703). The center tube (404) is slidably inserted into the centering sleeve (701). The vent hole (705) is connected to the adapter hole (603) through the inner cavity of the centering sleeve (701).

8. The tail gas adsorption tower for octafluoropropane preparation according to claim 7, characterized in that, The air-tight structure (8) includes an air-tight tube (801), the end face of the air supply short tube (601) is fixedly connected to the air-tight tube (801), the air-tight tube (801) is located inside the inflow cavity (506), an air-tight ring (802) is fixedly connected inside the air-tight tube (801), a frustoconical hole (803) is opened on the surface of the air-tight ring (802) away from the air supply short tube (601), the frustoconical hole (803) communicates with the adapter hole (603), and an installation ring (804) is covered on the end face of the air-tight tube (801). A mounting protrusion (805) is fixedly connected to the surface of the mounting ring (804). The mounting protrusion (805) is movably inserted into the air-sealing tube (801) and the two are threaded together. Multiple sector plates (806) are fixedly connected to the inner wall of the mounting ring (804). A buffer cylinder (807) is fixedly connected to the end of the sector plate (806). A ventilation slit (808) is formed between two adjacent sector plates (806). A preload spring (809) is fixedly connected to the end face of the inner cavity of the buffer cylinder (807).

9. The tail gas adsorption tower for octafluoropropane preparation according to claim 8, characterized in that, The other end of the preload spring (809) is fixedly connected to a preload cylinder (810), which is slidably inserted into the buffer cylinder (807). The other end of the preload cylinder (810) is fixedly connected to a shut-off cone plug (811), which is adapted to the frustum-shaped hole (803). The other side of the shut-off cone plug (811) is fixedly connected to an actuating rod (812). The other end of the actuating rod (812) passes through the frustum-shaped hole (803), the adapter hole (603), and extends into the centering sleeve (701). The tip of the actuating cone shell (704) is cut off and forms a round push surface, which contacts the end face of the actuating rod (812).

10. The tail gas adsorption tower for octafluoropropane preparation according to claim 9, characterized in that, An anti-overflow mechanism (9) is provided on the outside of the gas transmission short pipe (601). The anti-overflow mechanism (9) includes an anti-overflow ring (901). The anti-overflow ring (901) is sleeved on the outside of the gas transmission short pipe (601) and is located inside the outflow chamber (507). One end of the anti-overflow ring (901) is fixedly connected to the surface of the partition plate (505), and the other end of the anti-overflow ring (901) is fixedly connected to the inner wall of the disc box (401). An anti-overflow one-way valve (902) and a monitoring probe (903) are fixedly inserted on the anti-overflow ring (901). The monitoring probe (903) is electrically connected to an external terminal through a cable.

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