A recovery device based on alkylating reaction tail gas cryogenic process

Abstract

The application provides a recovery device based on a cryogenic process of alkylated reaction tail gas, and belongs to the technical field of alkylated reaction tail gas recovery, and comprises a recovery gas storage tank, a cyclone separation assembly for performing preliminary separation treatment on impurities in the alkylated reaction tail gas, a separation cylinder assembly installed on the outer wall of the cyclone separation cavity, and a flow guide assembly corresponding to the separation cylinder assembly, and an adsorption assembly for performing further adsorption treatment on residual impurities in the alkylated reaction tail gas in the recovery gas storage tank, and an impurity collection assembly for storing separated impurities is installed at the bottom of the recovery gas storage tank, the separation cylinder assembly can further intercept the impurities that are not adsorbed by the adsorption assembly, so that the impurities are prevented from entering the gas storage tank, accumulation of the impurities in the gas storage tank is avoided, the gas quality is not affected, and multiple safeguards are provided for the purity of the gas in the gas storage tank.

Description

Technical Field

[0001] This invention relates to the field of alkylation reaction tail gas recovery technology, and in particular to a cryogenic process recovery device based on alkylation reaction tail gas. Background Technology

[0002] In the cryogenic recovery of alkylation reaction tail gas, solid particles in the tail gas flow with the gas, which can wear down equipment such as compressors, pumps, and valves, reducing equipment lifespan, increasing maintenance costs and downtime. They can also easily accumulate in filters, causing blockages and affecting gas flow. They can also adhere to the heat transfer surfaces of heat exchangers, reducing heat transfer efficiency and affecting the cryogenic effect. If they enter the recovered product, they can further reduce product purity, affecting product quality and market value. At the same time, during the alkylation reaction, due to the heat of reaction and phase changes of substances in the system, some liquid substances may be entrained in the tail gas in the form of droplets. If they enter the subsequent cryogenic processing equipment along with the tail gas, the moisture will freeze into ice at low temperatures, which will block pipes, valves, heat exchangers, and other equipment, hindering gas flow, increasing system pressure, and even causing safety accidents. In addition, the frozen ice will increase thermal resistance, reduce the heat transfer efficiency of the cryogenic equipment, affect the refrigeration effect, and reduce the condensation and recovery efficiency of the target component. Furthermore, the moisture may also react chemically with some components in the tail gas, consuming the target component and reducing the purity and yield of the recovered product.

[0003] In Chinese patent publication CN221964879U, this utility model relates to the field of waste gas treatment technology, specifically a chlorinated tail gas recovery tank, including a tank body and a top cover, with a dehumidifying box installed on the top cover; a drain pipe is installed at the bottom of the outer wall of the tank body, and a control valve is installed on the drain pipe; an air inlet pipe and an air outlet pipe are installed at the center of the top surface of the top cover, and one end of the dehumidifying box is connected to the air outlet pipe. This utility model, by installing a dehumidifying box on the top cover, can effectively absorb and remove moisture and impurities from the tail gas. The air inlet pipe and tail gas treatment coil ensure that the tail gas can smoothly enter the recovery tank and be dispersed and mixed through the through holes on the tail gas treatment coil, allowing the tail gas to fully contact the liquid inside the recovery tank, improving recovery efficiency. The desiccant particles filling the dehumidifying box can continuously absorb moisture and impurities from the tail gas, ensuring that the discharged gas is dry and clean. The drain pipe is installed at the bottom of the outer wall of the tank body, allowing for convenient discharge of the liquid inside the recovery tank.

[0004] Existing alkylation reaction tail gas recovery devices have a drawback: when adsorbing impurities in the tail gas, some larger impurities cannot be adsorbed into the pores of the adsorption material and instead adhere to the surface of the adsorption material. Under the influence of airflow, these impurities easily float back into the tail gas recovery tank. When the gas inside the recovery tank is passed into subsequent equipment for cryogenic processing to recover its internal components, these floating impurities are likely to enter the subsequent processing equipment along with the tail gas, affecting the purity of the recovered product and potentially clogging the equipment. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect of the prior art that some light and bulky impurities enter the subsequent treatment equipment along with the tail gas, which will affect the purity of the recovered product. The present invention proposes a cryogenic process recovery device based on alkylation reaction tail gas.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention includes a recovery gas storage tank, wherein a cyclone separator assembly is coaxially installed inside the recovery gas storage tank. The cyclone separator assembly is used to perform preliminary separation treatment of impurities in the alkylation reaction tail gas. The cyclone separator assembly includes a cyclone separation chamber, which is fixedly connected to the recovery gas storage tank. A separation cylinder assembly is installed on the outer wall of the cyclone separation chamber, and the separation cylinder assembly is arranged in a ring array about the outer wall of the cyclone separator assembly. A flow guiding assembly is installed on the inner wall of the recovery gas storage tank, which is used to guide the airflow inside the recovery gas storage tank. The flow guiding assembly corresponds one-to-one with the separation cylinder assembly. An adsorption assembly is installed inside the separation cylinder assembly, which is used to further adsorb the residual impurities in the alkylation reaction tail gas in the recovery gas storage tank. An impurity collection assembly is installed at the bottom of the recovery gas storage tank, which is used to store the separated impurities.

[0007] Preferably, the separation cylinder assembly includes a cylinder, which is fixedly connected to the outer wall of the cyclone separation chamber. An air inlet is provided on one side of the cylinder, and a first filter screen is fixedly connected to the other side of the cylinder. A waste discharge channel is fixedly connected to the bottom of the cylinder, and the bottom end of the waste discharge channel is connected to the waste collection assembly.

[0008] Preferably, a fan is installed on the top of the gas recovery tank, and an exhaust pipe is fixedly connected to the outer wall of the gas recovery tank.

[0009] Preferably, the bottom end of the cylinder is provided with a waste discharge opening, and the waste discharge opening is connected to the waste discharge channel. The inner wall of the waste discharge opening gradually slopes inward from top to bottom.

[0010] Preferably, the inner wall of the top of the cylinder is provided with an upper sliding groove, and the inner wall of the bottom of the cylinder is provided with a lower sliding groove.

[0011] Preferably, the adsorption assembly includes an adsorption column body, the diameter of which is smaller than the opening size of the air inlet.

[0012] Preferably, a rotating shaft runs through the interior of the adsorption column body, and the adsorption column body and the rotating shaft are rotatably connected. A flow guide fin is fixedly connected to the outer wall of the adsorption column body. The flow guide fin is arranged in a ring array about the outer wall of the adsorption column body, and the cross-sectional shape of the flow guide fin is set to be horn-shaped.

[0013] Preferably, an upper slider is fixedly connected to the top end of the rotating shaft, and an electric push rod is installed on the side of the upper slider; a lower slider is fixedly connected to the bottom end of the rotating shaft.

[0014] Preferably, a sealing baffle is fitted at the bottom of the rotating shaft, and the sealing baffle is fixedly connected to the lower slider. The sealing baffle is used to control the opening and closing of the impurity discharge opening.

[0015] Preferably, the flow guiding assembly includes a flow guiding plate, which is fixedly connected to the inner wall of the gas recovery tank. The flow guiding plate has equally spaced flow guiding grooves on its sides, and the flow guiding grooves gradually slope downward from the side away from the separation cylinder assembly to the side closer to the separation cylinder assembly.

[0016] Preferably, the impurity collection assembly includes an impurity collection chamber, a second filter screen plate is fixedly connected inside the impurity collection chamber, a fan is installed on the side of the impurity collection chamber, the air inlet of the fan is connected to the impurity collection assembly and the air inlet of the fan is located above the second filter screen plate, and the air outlet of the fan is connected to the recovery storage tank.

[0017] Preferably, the inner wall of the cyclone separation chamber is provided with a spiral guide groove, the top of the cyclone separation chamber is fixedly connected to an air outlet pipe, and the air outlet pipe is connected to the inner cavity of the recovery storage tank, the side of the cyclone separation chamber is fixedly connected to an air inlet pipe, and the bottom of the cyclone separation chamber is connected to a sewage discharge pipe.

[0018] Compared with existing technologies, the beneficial effects of this invention include: It features a multi-layered processing mechanism that sequentially separates and adsorbs liquid droplets and impurities in the exhaust gas, effectively separating impurities and preventing them from entering subsequent equipment, causing damage, or affecting the purity of the recovered products. The adsorption component, located inside the separation cylinder assembly and capable of rotation, creates a relatively stable airflow path within the cylinder, allowing impurities in the exhaust gas to come into more thorough contact with the adsorption component, thereby improving the adsorption efficiency and effectively removing harmful substances from the exhaust gas. A filter screen is installed on the other side of the cylinder for secondary filtration of impurities not completely absorbed by the adsorption column. This filter screen further intercepts impurities, preventing them from entering the gas storage tank and avoiding their accumulation, which could affect gas quality. This provides a double guarantee for the purity of the gas in the storage tank. Furthermore, the cylinder can be backflushed for cleaning, maintaining good filtration performance and extending its service life. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0020] Figure 1 The schematic diagram shows a cross-sectional view of an overall cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0021] Figure 2 The schematic diagram shows the overall structure of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0022] Figure 3 The schematic diagram shows a top view of the internal structure of a cryogenic recovery tank of an alkylation reaction tail gas recovery device according to an embodiment of the present invention.

[0023] Figure 4 The schematic diagram shows a partial extended state of the adsorption component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0024] Figure 5 The schematic diagram shows a partial recovery state of the adsorption component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0025] Figure 6 The schematic diagram shows a structural schematic of a separation cylinder assembly portion of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0026] Figure 7 The schematic diagram shows a cross-sectional view of the main body of the cylinder and adsorption column of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0027] Figure 8 The schematic diagram shows the exploded structure of the sealing baffle and the lower slider portion of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0028] Figure 9 The schematic diagram shows a cross-sectional view of an impurity collection component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0029] Figure 10 The schematic diagram shows a flow guide component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0030] Figure 11 The diagram schematically shows a cross-sectional view of a cyclone separation component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0031] In the diagram: 1. Recovered gas storage tank; 2. Cyclone separator assembly; 3. Flow guide assembly; 4. Separation cylinder assembly; 5. Adsorption assembly; 6. Impurity collection assembly; 7. Fan; 8. Exhaust pipe; 201. Cyclone separator chamber; 202. Spiral flow guide groove; 203. Air outlet pipe; 204. Air inlet pipe; 205. Sewage discharge pipe; 301. Flow guide plate; 302. Flow guide chute; 401. Cylinder; 402. Air inlet opening; 403. First filter screen plate; 404. Upper sliding groove; 405. Impurity discharge opening; 406. Lower sliding groove; 407. Impurity discharge channel; 501. Adsorption column body; 502. Rotating shaft; 503. Flow guide fins; 504. Upper slider; 505. Electric push rod; 506. Lower slider; 507. Sealing baffle; 601. Impurity collection chamber; 602. Second filter screen plate; 603. Fan. Detailed Implementation

[0032] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0033] According to one embodiment of the present invention, Figures 1 to 11As shown. A cryogenic process recovery device based on alkylation reaction tail gas includes a recovery storage tank 1. A cyclone separator 2 is coaxially mounted inside the recovery storage tank 1. The cyclone separator 2 includes a cyclone separation chamber 201, which is fixedly connected to the recovery storage tank 1. A spiral guide groove 202 is formed on the inner wall of the cyclone separation chamber 201. An outlet pipe 203 is fixedly connected to the top of the cyclone separation chamber 201 and communicates with the inner cavity of the recovery storage tank 1. An inlet pipe 204 is fixedly connected to the side of the cyclone separation chamber 201, and a drain pipe 205 is connected to the bottom of the cyclone separation chamber 201.

[0034] The inlet end of the inlet pipe 204 is connected to the exhaust end of the alkylation reaction equipment. The exhaust gas generated by the alkylation reaction enters the interior of the cyclone separation chamber 201 through the inlet pipe 204 and rotates downward in a spiral shape. The spiral guide groove 202 is used to guide the airflow along a specific spiral path, making the rotation of the airflow more regular and stable, forming a stronger centrifugal force field. This helps to more effectively throw the particulate matter and liquid droplets in the exhaust gas toward the inner wall of the separator, improving the separation efficiency. The liquid droplets and particulate matter and other impurities thrown onto the inner wall of the cyclone separation chamber 201 under the action of centrifugal force flow downward along its inner wall through the drain pipe 205 into the interior of the impurity collection assembly 6 for collection. The gas is discharged upward into the inner cavity of the recovery storage tank 1 through the outlet pipe 203.

[0035] Cyclone separator 2 is used for preliminary separation of impurities in the alkylation reaction tail gas. After the tail gas enters cyclone separator 2, it undergoes preliminary treatment under centrifugal force, and then enters the inner cavity of the recovery storage tank 1 for further adsorption treatment by adsorption assembly 5. Cyclone separator 2 uses centrifugal force to separate larger solid particles in the tail gas. If these large particles directly enter the adsorption column, they can easily clog the pores and channels of the adsorption column, increasing the resistance to gas flow and causing the pressure of the adsorption column to rise. By removing large particles in advance through cyclone separation, the gas flow in the adsorption column can be smoother, reducing the pressure rise caused by blockage. In addition, the particles in the tail gas will cover the surface of the silica gel adsorbent, which not only reduces the adsorbent's resistance to the silica gel adsorbent but also... The reduced adsorption efficiency of moisture can also decrease the gaps between adsorbent particles, affecting gas passage. Cyclone separation can remove most particulate matter, reducing the degree of adsorbent contamination, maintaining the adsorbent's good performance, and making the mass transfer process of gas in the adsorption column more efficient. This avoids abnormal pressure increases caused by adsorbent performance degradation. At the same time, preliminary separation through cyclone separation reduces the impurity content entering the adsorption column, making the adsorption column's working state more stable and extending the adsorbent's service life. Throughout the operation, the adsorption column does not need frequent regeneration or replacement due to impurity blockage or adsorbent failure, thus avoiding pressure fluctuations and system instability caused by frequent equipment maintenance and helping to maintain stable system pressure.

[0036] A separation cylinder assembly 4 is installed on the outer wall of the cyclone separation chamber 201, and the separation cylinder assembly 4 is arranged in a ring array about the outer wall of the cyclone separation assembly 2. The separation cylinder assembly 4 includes a cylinder 401, which is fixedly connected to the outer wall of the cyclone separation chamber 201. An air inlet 402 is opened on one side of the cylinder 401, and a first filter screen plate 403 is fixedly connected to the other side of the cylinder 401. A waste discharge channel 407 is fixedly connected to the bottom of the cylinder 401, and the bottom end of the waste discharge channel 407 is connected to the waste collection assembly 6. A waste discharge opening 405 is opened at the bottom end of the cylinder 401, and the waste discharge opening 405 is connected to the waste discharge assembly 6. The channels 407 are connected, and the inner wall of the discharge opening 405 gradually slopes inward from top to bottom. The discharge opening 405 has a large opening at the top and a small opening at the bottom, forming a funnel shape. The large opening at the top of the funnel-shaped outlet allows exhaust gas and impurities to have more space when discharged, reducing airflow obstruction at the intake and allowing gas and impurities to be discharged more smoothly and quickly. At the same time, the smaller opening at the bottom of the funnel-shaped outlet can prevent exhaust gas and impurities from flowing back to a certain extent, ensuring the unidirectionality of the discharge process. The inner wall of the top of the cylinder 401 is provided with an upper sliding groove 404, and the inner wall of the bottom of the cylinder 401 is provided with a lower sliding groove 406.

[0037] The fan 7, installed on top of the gas recovery tank 1, drives the gas inside the tank to rotate. Under the guidance of the flow guide component 3, some gas enters the cylinder 401 through the inlet 402. The adsorption component 5 deeply adsorbs the remaining particles and moisture in the exhaust gas. Some larger but lighter impurities are difficult to be drawn in by the adsorption component 5 and will temporarily remain inside the cylinder 401. Under the action of airflow, they adhere to the inner wall of the first filter plate 403. Meanwhile, the exhaust gas, after further adsorption treatment, can return to the inner cavity of the gas recovery tank 1 through the first filter plate 403. After this recovery device has been operating for a period of time... When a large amount of impurities accumulate inside the cylinder 401, the adsorption column body 501 can be pushed to the air inlet 402 to block the air inlet 402. At this time, when the impurity discharge opening 405 is opened, the impurities inside the cylinder 401 enter the impurity collection component 6 through the impurity discharge channel 407 under the action of gravity and airflow. At the same time, under the action of the fan 603, a negative pressure is formed at the lower end of the impurity discharge channel 407. The airflow enters the inside of the cylinder 401 through the outside of the first filter screen plate 403, which has a back-blowing effect on the first filter screen plate 403. This can effectively blow the impurities adhering to the inner wall of the first filter screen plate 403 inward, making it convenient to automatically unclog and clean the first filter screen plate 403.

[0038] An adsorption assembly 5 is installed inside the separation cylinder assembly 4. The adsorption assembly 5 is used to further adsorb residual impurities in the tail gas of the alkylation reaction in the recovery storage tank 1. The adsorption assembly 5 includes an adsorption column body 501. The diameter of the adsorption column body 501 is smaller than the opening size of the air inlet 402. A rotating shaft 502 passes through the inside of the adsorption column body 501, and the adsorption column body 501 and the rotating shaft 502 are rotatably connected. An upper slider 504 is fixedly connected to the top of the rotating shaft 502, and an electric push rod 505 is installed on the side of the upper slider 504. The upper slider 504 is slidably connected to the inside of the upper sliding groove 404. A lower slider 506 is fixedly connected to the bottom of the rotating shaft 502, and the lower slider 506 is slidably connected to the inside of the lower sliding groove 406. Under the action of the electric push rod 505, the adsorption column body 501 can be pulled into the inside of the cylinder 401 to rotate and adsorb the tail gas, or pushed outward so that the adsorption column body 501 is stuck at the air inlet 402 to block it.

[0039] A sealing baffle 507 is fitted onto the bottom of the rotating shaft 502, and the sealing baffle 507 is fixedly connected to the lower slider 506. The sealing baffle 507 is also slidably connected to the bottom surface of the cylinder 401. The sealing baffle 507 controls the opening and closing of the impurity discharge opening 405. Two arc-shaped surfaces are symmetrically arranged on the sides of the sealing baffle 507, and the curvature of these two arc-shaped surfaces matches the curvature of the inner wall of the cylinder 401. When the adsorption column body 501 enters the cylinder 401, the sealing baffle 507 is just positioned... The baffle plate 507 is positioned above the discharge opening 405 to block it, allowing the gas inside the cylinder 401 to be discharged outwards only through the first filter screen 403. When the adsorption column body 501 is pushed outwards, it simultaneously slides outwards along with the baffle plate 507, opening the discharge opening 405. The gas and impurities inside the cylinder 401 can then be discharged downwards through the discharge opening 405. At this time, the baffle plate 507 is positioned above the sliding groove 406, effectively preventing impurities from clogging the sliding groove 406.

[0040] The adsorption column body 501 rotates within the cylinder 401 via the rotating shaft 502, ensuring uniform contact between the adsorbent surface and the exhaust gas, avoiding excessive localized loss, and improving adsorption uniformity. During adsorption, a thin boundary layer forms on the surface of the adsorption column body 501, containing a high concentration of impurities. As adsorption progresses, the impurity concentration gradient within this boundary layer gradually decreases, hindering further adsorption. Rotation disrupts this boundary layer, allowing impurities in the exhaust gas to more easily break through and reach the surface of the adsorption column body 501, promoting continuous adsorption and improving both the adsorption rate and adsorption capacity. Furthermore, the rotation of the adsorption column body 501 drives the surrounding airflow, resulting in a more uniform distribution of the exhaust gas within the cylinder 401. This prevents localized short-circuiting or dead zones in the airflow, ensuring that impurities in the exhaust gas can more evenly contact the adsorption column body 501, thereby improving adsorption efficiency and effectiveness, and reducing incomplete adsorption caused by uneven airflow.

[0041] A guide fin 503 is fixedly connected to the outer wall of the adsorption column body 501. The guide fin 503 is arranged in a ring array around the outer wall of the adsorption column body 501, and the cross-sectional shape of the guide fin 503 is set as a bull's horn shape. The bull's horn-shaped guide fin 503 has an inner arc surface and an outer arc surface. When the airflow entering the cylinder 401 flows through the guide fin 503, a pressure difference can be generated at the two arc surfaces of the guide fin 503, which can effectively guide the airflow and make the airflow drive the adsorption column body 501 to rotate. When the adsorption column body 501 is pushed outward and stuck at the air inlet opening 402, if the outer arc surface of the guide fin 503 is in contact with the edge of the air inlet opening 402, it can also slide under its arc action, making slight adjustment to the angle of the adsorption column body 501 so that the adsorption column body 501 can be just stuck at the air inlet opening 402 for sealing.

[0042] The adsorption component 5 is located inside the separation cylinder component 4, enabling the exhaust gas to form a relatively stable airflow path within the cylinder 401. This allows impurities in the exhaust gas to come into more thorough contact with the adsorption component 5, thereby improving the adsorption efficiency of the adsorption component 5 and effectively removing harmful substances from the exhaust gas. A filter screen is installed on the other side of the cylinder 401, which can perform secondary filtration on impurities that are not completely absorbed by the adsorption column. This filter screen can further intercept impurities, preventing them from entering the gas storage tank and avoiding the accumulation of impurities in the gas storage tank, which would affect the gas quality. This provides a double guarantee for the purity of the gas in the gas storage tank. Regularly backflushing the cylinder 401 is relatively simple and convenient. Backflushing can effectively remove residual impurities on the cylinder 401, maintaining good filtration performance and extending its service life. Moreover, the impurities remaining inside the cylinder 401 are uniformly sent into the subsequent impurity collection component 6 for centralized processing, which helps maintain the cleanliness and normal operation of the entire system.

[0043] Through the combined action of adsorption component 5 and separation cylinder component 4, impurities are prevented from re-entering the recovery gas storage tank 1, thus protecting the recovery gas storage tank 1 and its internal gas from contamination. This, in turn, helps reduce the moisture and impurities contained in the recovered exhaust gas, effectively preventing adverse effects on subsequent cryogenic processes. This design forms a relatively independent and complete impurity treatment unit. From impurity adsorption to filtration and cleaning collection, each step works closely together, helping to optimize the performance of the entire exhaust gas treatment system, improve system stability and reliability, and ensure its long-term efficient operation.

[0044] A flow guiding assembly 3 is installed on the inner wall of the gas recovery storage tank 1. The flow guiding assembly 3 is used to guide the airflow inside the gas recovery storage tank 1, and the flow guiding assembly 3 corresponds one-to-one with the separation cylinder assembly 4. The flow guiding assembly 3 includes a flow guiding plate 301, which is fixedly connected to the inner wall of the gas recovery storage tank 1. The flow guiding plate 301 is inclined inward to form a contraction channel, which guides the airflow to accelerate. It is used to guide the gas inside the gas recovery storage tank 1 to the air inlet 402, and there is still a certain distance between the side of the flow guiding plate 301 and the cylinder 401, so that some gas... The gas enters the air inlet 402, and some of the gas flows backward through the gap between the guide plate 301 and the cylinder 401, receiving the guiding effect of the next set of guide components 3. The guide plate 301 has guide grooves 302 at equal intervals on its side. The guide grooves 302 are used to make the airflow pass through the guide plate 301 more smoothly, reduce airflow turbulence, and improve airflow efficiency. The guide grooves 302 gradually slope downward from the side away from the separator cylinder assembly 4 to the side closer to the separator cylinder assembly 4, which can gradually guide the airflow from above downward.

[0045] An impurity collection assembly 6 is installed at the bottom of the gas recovery storage tank 1. The impurity collection assembly 6 is used to store the separated impurities. The impurity collection assembly 6 includes an impurity collection chamber 601. A second filter screen 602 is fixedly connected inside the impurity collection chamber 601. A fan 603 is installed on the side of the impurity collection chamber 601. The air inlet of the fan 603 is connected to the impurity collection assembly 6, and the air inlet of the fan 603 is located above the second filter screen 602. The air outlet of the fan 603 is connected to the gas recovery storage tank 1. A valve and an outlet are provided at the bottom of the impurity collection chamber 601 to discharge the impurities inside the impurity collection chamber 601 to the outside.

[0046] The second filter plate 602 divides the space inside the impurity collection chamber 601 into upper and lower cavities. The outlet end of the drain pipe 205 and the outlet end of the impurity discharge channel 407 are both located below the second filter plate 602, which can introduce the gas containing impurities into the cavity below the second filter plate 602. Due to the filtering effect of the second filter plate 602, the impurities remain below, and the gas can enter the upper cavity through the second filter plate 602. The air inlet end of the blower 603 is connected to the upper cavity, which can draw the filtered gas back into the interior of the recovery storage tank 1 to form a cycle and effectively prevent gas from leaking out.

[0047] An exhaust pipe 8 is fixedly connected to the outer wall of the gas recovery tank 1. The exhaust pipe 8 is connected to the inner cavity of the gas recovery tank 1 and is used to introduce the waste gas inside the gas recovery tank 1 into the subsequent cryogenic process equipment for recovery treatment.

[0048] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A cryogenic process recovery device based on alkylation reaction tail gas, characterized in that, The system includes a recovery gas storage tank, inside which a cyclone separator assembly is coaxially mounted. The cyclone separator assembly is used for preliminary separation of impurities in the alkylation reaction tail gas. The cyclone separator assembly includes a cyclone separation chamber, which is fixedly connected to the recovery gas storage tank. A separation cylinder assembly is mounted on the outer wall of the cyclone separation chamber, and the separation cylinder assemblies are arranged in a ring array about the outer wall of the cyclone separator assembly. A flow guiding assembly is mounted on the inner wall of the recovery gas storage tank to guide the airflow inside the tank, and the flow guiding assembly corresponds one-to-one with the separation cylinder assembly. An adsorption assembly is mounted inside the separation cylinder assembly to further adsorb residual impurities in the alkylation reaction tail gas from the recovery gas storage tank. An impurity collection assembly is mounted at the bottom of the recovery gas storage tank to store the separated impurities. The separation cylinder assembly includes a cylinder, which is fixedly connected to the outer wall of the cyclone separation chamber. An air inlet is provided on one side of the cylinder, and a first filter screen is fixedly connected to the other side of the cylinder. A waste discharge channel is fixedly connected to the bottom of the cylinder, and the bottom end of the waste discharge channel is connected to a waste collection assembly. A fan is installed on the top of the gas recovery tank, and an exhaust pipe is fixedly connected to the outer wall of the gas recovery tank.

2. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 1, characterized in that, The bottom end of the cylinder has a discharge opening, which is connected to the discharge channel. The inner wall of the discharge opening gradually slopes inward from top to bottom.

3. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 1, characterized in that, The inner wall of the top of the cylinder has an upper sliding groove, and the inner wall of the bottom of the cylinder has a lower sliding groove.

4. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 1, characterized in that, The adsorption assembly includes an adsorption column body, the diameter of which is smaller than the opening size of the air inlet.

5. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 4, characterized in that, The adsorption column body has a rotating shaft running through its interior, and the adsorption column body is rotatably connected to the rotating shaft. The outer wall of the adsorption column body is fixedly connected to a flow guide fin, which is arranged in a ring array about the outer wall of the adsorption column body, and the cross-sectional shape of the flow guide fin is set to be a bull's horn shape.

6. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 5, characterized in that, An upper slider is fixedly connected to the top of the rotating shaft, and an electric push rod is installed on the side of the upper slider. A lower slider is fixedly connected to the bottom of the rotating shaft.

7. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 6, characterized in that, A sealing baffle is fitted at the bottom of the rotating shaft, and the sealing baffle is fixedly connected to the lower slider. The sealing baffle is used to control the opening and closing of the impurity discharge opening.

8. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 1, characterized in that, The flow guiding assembly includes a flow guiding plate, which is fixedly connected to the inner wall of the gas recovery tank. The flow guiding plate has equally spaced flow guiding grooves on its sides, and the flow guiding grooves gradually slope downward from the side away from the separation cylinder assembly to the side closer to the separation cylinder assembly.

9. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 1, characterized in that, The impurity collection assembly includes an impurity collection chamber, a second filter screen plate is fixedly connected inside the impurity collection chamber, a fan is installed on the side of the impurity collection chamber, the air inlet of the fan is connected to the impurity collection assembly and the air inlet of the fan is located above the second filter screen plate, and the air outlet of the fan is connected to the recovery storage tank.

10. The cryogenic process recovery device based on alkylation reaction tail gas as described in claim 1, characterized in that, The inner wall of the cyclone separation chamber is provided with a spiral guide groove. The top of the cyclone separation chamber is fixedly connected to an air outlet pipe, which is connected to the inner cavity of the recovery storage tank. The side of the cyclone separation chamber is fixedly connected to an air inlet pipe, and the bottom of the cyclone separation chamber is connected to a sewage discharge pipe.

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