Cryogenic process recovery device based on alkylation reaction tail gas

Abstract

The invention provides a cryogenic process recovery device based on alkylation reaction tail gas, and belongs to the technical field of alkylation reaction tail gas recovery, the cryogenic process recovery device comprises a recovery gas storage tank, a cyclone separation assembly used for carrying out preliminary separation treatment on impurities in the alkylation reaction tail gas, and a separation cylinder assembly mounted on the outer wall of a cyclone separation cavity, the separation barrel assemblies are distributed in an annular array relative to the outer wall of the cyclone separation assembly, the flow guide assemblies are in one-to-one correspondence with the separation barrel assemblies, and the adsorption assembly is used for further adsorbing residual impurities in alkylation reaction tail gas of the recycled gas storage tank. And the impurity collecting assembly used for storing the separated impurities is installed at the bottom of the recovery gas storage tank, the separation barrel assembly can further intercept the impurities which are not adsorbed by the adsorption assembly and prevent the impurities from entering the gas storage tank, the situation that the impurities are accumulated in the gas storage tank and affect the gas quality is avoided, and multiple guarantees are provided for the purity of gas in the gas storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of alkylation reaction tail gas recovery, and particularly to a cryogenic process recovery device based on alkylation reaction tail gas. Background Art

[0002] In the cryogenic process recovery of alkylation reaction tail gas, solid particles in the tail gas flow with the tail gas, which will wear equipment such as compressors, pumps, and valves, reduce the service life of the equipment, increase the maintenance cost and downtime, and are also likely to accumulate in the filter and cause blockage, affecting gas flow. Attached to the heat transfer surface of the heat exchanger, it reduces the heat transfer efficiency and affects the cryogenic effect. Once it enters the recovered product, it will further reduce the product purity, affecting the product quality and market value. At the same time, during the alkylation reaction process, due to the influence of the reaction heat and the phase change of substances in the system, some liquid substances may be entrained in the tail gas in the form of droplets. If they enter the treatment equipment in the subsequent cryogenic process together with the tail gas, the moisture will freeze into ice at low temperature, thus blocking equipment such as pipelines, valves, and heat exchangers, hindering gas flow, increasing the system pressure, and even causing safety accidents. At the same time, the frozen ice will increase the heat transfer resistance, reduce the heat transfer efficiency of the cryogenic equipment, affect the refrigeration effect, resulting in a decrease in the condensation recovery efficiency of the target component, and the moisture may also chemically react with some components in the tail gas, consuming the target component and reducing the purity and yield of the recovered product.

[0003] In the Chinese patent with the publication number CN221964879U, this utility model relates to the technical field of waste gas treatment, specifically to a chlorine tail gas recovery tank, which includes a tank body and a top cover. A drying and dehumidifying box is installed above 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 inlet pipe and an exhaust pipe are installed at the center of the top surface of the top cover, and one end of the drying and dehumidifying box is connected to the exhaust pipe. By installing the drying and dehumidifying box on the top cover, this utility model can effectively absorb and remove the moisture and impurities in the tail gas. The setting of the inlet pipe and the tail gas treatment coil can ensure that the tail gas can smoothly enter the inside of the recovery tank and be dispersed and mixed through the through holes on the tail gas treatment coil, so that the tail gas can fully contact with the liquid inside the recovery tank, improving the recovery efficiency. The drying agent particles are filled in the drying and dehumidifying box, which can continuously absorb the moisture and impurities in 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, which can conveniently discharge the liquid inside the recovery tank.

[0004] In the existing alkylation reaction tail gas recovery device, when adsorbing impurities in the tail gas, some impurities with larger volumes cannot be adsorbed into the voids of the adsorption material and adhere to the surface of the adsorption material. Under the action of the air flow, they are easily floated again inside the tail gas recovery tank. When the gas inside the recovery tank is introduced into subsequent equipment for deep cooling process to recover the components inside, these floating impurities are easily carried into the subsequent processing equipment along with the tail gas, which will affect the purity of the recovered product and may block the equipment. Summary of the Invention

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

[0006] To solve the above technical problem, the technical solution adopted by the present invention is to include a recovery gas storage tank. A cyclone separation assembly is coaxially installed inside the recovery gas storage tank. The cyclone separation assembly is used for preliminary separation treatment of impurities in the alkylation reaction tail gas. The cyclone separation assembly includes a cyclone separation chamber, and the cyclone separation chamber 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 assemblies are distributed in a circular array about the outer wall of the cyclone separation assembly. A flow guiding assembly is installed on the inner wall of the recovery gas storage tank. The flow guiding assembly is used for guiding the air flow inside the recovery gas storage tank, and the flow guiding assembly corresponds to the separation cylinder assembly one by one. An adsorption assembly is installed inside the separation cylinder assembly. The adsorption assembly is used for further adsorption treatment of the remaining impurities in the alkylation reaction tail gas of the recovery gas storage tank. An impurity collection assembly is installed at the bottom of the recovery gas storage tank. The impurity collection assembly is used for storing the separated impurities.

[0007] Preferably, the separation cylinder assembly includes a cylinder. The cylinder is fixedly connected to the outer wall of the cyclone separation chamber. An air inlet opening is provided on one side of the cylinder, and a first filter screen plate 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 communicated with the impurity collection assembly.

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

[0009] Preferably, a waste discharge opening is provided at the bottom end of the cylinder, and the waste discharge opening is communicated with the waste discharge channel. The inner wall of the waste discharge opening gradually inclines inwards from top to bottom.

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

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

[0012] Preferably, a rotating shaft penetrates through the interior of the adsorption column body, and the adsorption column body is rotatably connected to the rotating shaft. A flow guiding fin is fixedly connected to the outer wall of the adsorption column body. The flow guiding fins are arranged in an annular array on the outer wall of the adsorption column body, and the cross-sectional shape of the flow guiding fin is set to a horn shape.

[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 plugging baffle is sleeved at the bottom of the rotating shaft, and the plugging baffle is fixedly connected to the lower slider. The plugging 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 recovery gas storage tank. Flow guiding inclined grooves are equidistantly arranged on the side of the flow guiding plate, and the flow guiding inclined grooves gradually incline downward from the side far away from the separation cylinder assembly to the side close 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 end of the fan is communicated with the impurity collection assembly, and the air inlet end of the fan is located above the second filter screen plate. The air outlet end of the fan is communicated with the recovery gas storage tank.

[0017] Preferably, spiral flow guiding grooves are formed on the inner wall of the cyclone separation chamber. An air outlet pipe is fixedly connected to the top of the cyclone separation chamber, and the air outlet pipe is communicated with the inner cavity of the recovery gas storage tank. An air inlet pipe is fixedly connected to the side of the cyclone separation chamber, and a sewage discharge pipe is communicated with the bottom end of the cyclone separation chamber.

[0018] Compared with the prior art, the beneficial effects of the present invention include: It is provided with a multi-layer processing mechanism to sequentially separate and adsorb the liquid beads and impurities in the tail gas, which can effectively separate the impurities in the tail gas, prevent these impurities from entering the subsequent equipment, causing damage to the equipment or affecting the purity of the subsequent recycled products. The adsorption component is located inside the separation cylinder component and can rotate, which can form a relatively stable air flow path for the tail gas in the cylinder, enabling the impurities in the tail gas to come into contact with the adsorption component more fully, thereby improving the adsorption efficiency of the adsorption component for impurities and effectively removing harmful substances in the tail gas. A filter screen is provided on the other side of the cylinder, which can perform secondary filtration on the impurities that are not completely sucked into the adsorption column. This filter screen can further intercept impurities and prevent them from entering the gas storage tank, avoiding the accumulation of impurities in the gas storage tank and affecting the gas quality, providing double protection for the purity of the gas in the gas storage tank. And it can perform backwashing and cleaning on the cylinder to keep the cylinder in good filtering performance and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 Schematically shows a cross-sectional structure diagram of an overall cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 2 Schematically shows a structural diagram of an overall cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 3 Schematically shows a structural diagram of the interior of a gas storage tank of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention when viewed from above; Figure 4 Schematically shows a structural diagram of a partial ejection state of an adsorption component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 5 Schematically shows a structural diagram of a partial retraction state of an adsorption component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 6 Schematically shows a structural diagram of a part of a separation cylinder component of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 7Schematically shows a schematic cross-sectional structure diagram of a cylinder and a main body of an adsorption column of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 8 Schematically shows an exploded structure diagram of a sealing baffle and a lower sliding block part of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 9 Schematically shows a schematic cross-sectional structure diagram of an impurity collection component part of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 10 Schematically shows a structure diagram of a diversion component part of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention; Figure 11 Schematically shows a schematic cross-sectional structure diagram of a cyclone separation component part of a cryogenic process recovery device based on alkylation reaction tail gas according to an embodiment of the present invention.

[0020] In the figure: 1, recovery gas storage tank; 2, cyclone separation component; 3, diversion component; 4, separation cylinder component; 5, adsorption component; 6, impurity collection component; 7, fan; 8, exhaust pipe; 201, cyclone separation chamber; 202, spiral diversion groove; 203, air outlet pipe; 204, air inlet pipe; 205, sewage discharge pipe; 301, diversion plate; 302, diversion inclined groove; 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 main body; 502, rotating shaft; 503, diversion fin; 504, upper sliding block; 505, electric push rod; 506, lower sliding block; 507, sealing baffle; 601, impurity collection chamber; 602, second filter screen plate; 603, blower. Detailed implementation manners

[0021] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, those of ordinary skill in the art can propose various interchangeable structural forms and implementation manners. Therefore, the following detailed implementation manners and the accompanying drawings are only illustrative descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0022] According to an embodiment of the present invention in combination with Figures 1 to 11Shown. A cryogenic process recovery device based on the tail gas of an alkylation reaction, comprising a recovery gas storage tank 1. A cyclone separation assembly 2 is coaxially installed inside the recovery gas storage tank 1. The cyclone separation assembly 2 includes a cyclone separation chamber 201, and the cyclone separation chamber 201 is fixedly connected to the recovery gas storage tank 1. A spiral guide groove 202 is provided on the inner wall of the cyclone separation chamber 201. An air outlet pipe 203 is fixedly connected to the top of the cyclone separation chamber 201, and the air outlet pipe 203 communicates with the inner cavity of the recovery gas storage tank 1. An air inlet pipe 204 is fixedly connected to the side of the cyclone separation chamber 201. A sewage discharge pipe 205 is communicated with the bottom end of the cyclone separation chamber 201.

[0023] The air inlet end of the air inlet pipe 204 is connected to the tail gas discharge end of the alkylation reaction equipment. The tail gas generated by the alkylation reaction enters the inside of the cyclone separation chamber 201 through the air inlet pipe 204 and rotates downward in a spiral shape. The spiral guide groove 202 is used to guide the air flow along a specific spiral path, making the rotation of the air flow more regular and stable, forming a stronger centrifugal force field, which helps to more effectively throw the particulate matter and liquid beads in the tail gas towards the inner wall of the separator, improving the separation efficiency. Under the action of centrifugal force, the liquid beads and particulate matter and other impurities thrown on the inner wall of the cyclone separation chamber 201 flow down along its inner wall through the sewage discharge pipe 205 into the inside of the impurity collection assembly 6 for collection, and the gas is discharged upward into the inner cavity of the recovery gas storage tank 1 through the air outlet pipe 203.

[0024] The cyclone separation assembly 2 is used for the preliminary separation treatment of the impurities in the tail gas of the alkylation reaction. After the tail gas enters the cyclone separation assembly 2, it is preliminarily treated under the action of centrifugal force, and then enters the inner cavity of the recovery gas storage tank 1 to continue to receive the adsorption treatment of the adsorption assembly 5. The cyclone separation assembly 2 uses centrifugal force to separate the larger particulate solid matter in the tail gas. If these large particles directly enter the adsorption column, it is easy to block the pores and channels of the adsorption column, increase the resistance of gas flow, and cause the pressure of the adsorption column to rise. By removing the large particles in advance through cyclone separation, the gas flow in the adsorption column can be made more smooth, reducing the pressure rise caused by blockage. Moreover, the particulate matter in the tail gas will cover the surface of the silica gel adsorbent, not only reducing the adsorption efficiency of the adsorbent for moisture, but also possibly making the gaps between the adsorbent particles smaller, affecting the gas passage. Cyclone separation can remove most of the particulate matter, reduce the degree of contamination of the adsorbent, maintain the good performance of the adsorbent, make the mass transfer process of the gas in the adsorption column more efficient, avoid the abnormal pressure rise caused by the decline of the adsorbent performance, and at the same time, through preliminary separation by cyclone separation, the impurity content entering the adsorption column is reduced, making the working state of the adsorption column more stable and extending the service life of the adsorbent. During the whole operation process, the adsorption column does not need to be regenerated or replaced frequently due to impurity blockage or adsorbent failure, thus avoiding the pressure fluctuations and system instability factors brought by frequent equipment maintenance and being conducive to maintaining the stability of the system pressure.

[0025] The outer wall of the cyclone separation chamber 201 is installed with a separation cylinder assembly 4, and the separation cylinder assembly 4 is distributed in a circular array with respect to the outer wall of the cyclone separation assembly 2. The separation cylinder assembly 4 includes a cylinder 401, and the cylinder 401 is fixedly connected to the outer wall of the cyclone separation chamber 201. An air inlet opening 402 is provided 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. An impurity discharge channel 407 is fixedly connected to the bottom of the cylinder 401, and the bottom end of the impurity discharge channel 407 is connected to the impurity collection assembly 6. An impurity discharge opening 405 is provided at the bottom of the cylinder 401, and the impurity discharge opening 405 is connected to the impurity discharge channel 407. The channel 407 is interconnected, and the inner wall of the impurity discharge opening 405 is gradually inclined inward from top to bottom. The impurity discharge opening 405 is large at the upper end and small at the lower end, forming a funnel shape. The large opening design at the upper end of the funnel-shaped outlet can allow exhaust gas and impurities to have a wider space when discharged, reduce airflow obstruction at the air intake, and allow gas and impurities to be discharged more smoothly and quickly. At the same time, the lower end opening of the funnel-shaped outlet structure is smaller, which can prevent the exhaust gas and impurities from flowing back to a certain extent, thereby ensuring the unidirectionality of the discharge process. An upper slide groove 404 is provided on the inner wall of the top of the cylinder 401, and a lower slide groove 406 is provided on the inner wall of the bottom of the cylinder 401.

[0026] The fan 7 installed on the top of the recovery gas storage tank 1 is used to drive the gas inside the recovery gas storage tank 1 to rotate. Under the guidance of the guide component 3, part of the gas will enter the cylinder 401 through the air inlet opening 402, and the adsorption component 5 will deeply adsorb the remaining particles and impurities such as moisture in the tail gas. Some of the impurities with large volume but light weight are difficult to be sucked by the adsorption component 5, and will be temporarily stored in the cylinder 401. Under the action of the airflow, they will stick to the inner wall of the first filter plate 403. At the same time, the tail gas that has been further adsorbed can continue to return to the inner cavity of the recovery gas storage tank 1 through the first filter plate 403. After this recovery device has been operated 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 opening 402 to block the air inlet opening 402. At this time, when the impurity removal opening 405 is opened, the impurities in the cylinder 401 enter the impurity collection component 6 through the impurity removal 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 removal channel 407, and the airflow enters the interior of the cylinder 401 through the outside of the first filter screen plate 403, which has a backblowing effect on the first filter screen plate 403, and can effectively blow the impurities adhered to the inner wall of the first filter screen plate 403 inward, so as to facilitate the automatic dredging and cleaning of the first filter screen plate 403.

[0027] An adsorption component 5 is installed inside the separation cylinder component 4. The adsorption component 5 is used for further adsorbing and treating the residual impurities in the tail gas of the alkylation reaction in the recovery gas storage tank 1. The adsorption component 5 includes an adsorption column main body 501. The diameter dimension of the adsorption column main body 501 is smaller than the opening dimension of the air inlet opening 402. A rotating shaft 502 penetrates through the inside of the adsorption column main body 501, and the adsorption column main body 501 is rotatably connected to the rotating shaft 502. The top end of the rotating shaft 502 is fixedly connected with an upper sliding block 504, and an electric push rod 505 is installed on the side of the upper sliding block 504. The upper sliding block 504 is slidably connected inside the upper sliding groove 404. The bottom end of the rotating shaft 502 is fixedly connected with a lower sliding block 506, and the lower sliding block 506 is slidably connected inside the lower sliding groove 406. Under the action of the electric push rod 505, the adsorption column main body 501 can be pulled into the inside of the cylinder 401 to rotate and adsorb the tail gas, or pushed outwards so that the adsorption column main body 501 is stuck at the air inlet opening 402 for blocking.

[0028] A blocking baffle 507 is sleeved at the bottom of the rotating shaft 502, and the blocking baffle 507 is fixedly connected to the lower sliding block 506, and the blocking baffle 507 is slidably connected to the bottom surface of the cylinder 401. The blocking baffle 507 is used to control the opening and closing of the impurity discharge opening 405. Two arc surfaces are symmetrically arranged on the side of the blocking baffle 507, and the curvature diameters of these two arc surfaces are the same as the curvature diameter of the inner wall of the cylinder 401. When the adsorption column main body 501 enters the inside of the cylinder 401, the blocking baffle 507 just blocks above the impurity discharge opening 405 to block it, so that the gas inside the cylinder 401 can only be discharged outwards through the first filter plate 403. When the adsorption column main body 501 is pushed outwards, it simultaneously drives the blocking baffle 507 to slide outwards, so that the impurity discharge opening 405 is in an open state, and the gas and impurities inside the cylinder 401 can be discharged downwards through the impurity discharge opening 405. At this time, the blocking baffle 507 blocks above the lower sliding groove 406, which can effectively prevent impurities from blocking the lower sliding groove 406.

[0029] The adsorption column body 501 rotates in the cylinder 401 through the rotating shaft 502 to ensure that the adsorbent surface is evenly in contact with the tail gas, avoid local excessive loss, and improve the uniformity of adsorption. In the adsorption process, a thin boundary layer will be formed on the surface of the adsorption column body 501, in which the impurity concentration is relatively high. As the adsorption proceeds, the impurity concentration gradient in the boundary layer will gradually decrease, hindering the continued adsorption. The rotation can destroy this boundary layer, making it easier for impurities in the tail gas to break through the boundary layer and reach the surface of the adsorption column body 501, promoting the continuous adsorption process, which is conducive to improving the adsorption rate and adsorption amount. In addition, when the adsorption column body 501 rotates, it will drive the surrounding airflow to make the tail gas more evenly distributed in the cylinder 401. In this way, local short circuits or dead zones in the airflow can be avoided, ensuring that the impurities in the tail gas can contact the adsorption column body 501 more evenly, thereby improving the efficiency and effect of adsorption and reducing the incomplete adsorption caused by uneven airflow.

[0030] The outer wall of the adsorption column body 501 is fixedly connected with the guide fins 503, and the guide fins 503 are distributed in a circular array with respect to the outer wall of the adsorption column body 501, and the cross-sectional shape of the guide fins 503 is set to be a bull horn shape. The bull horn-shaped guide fins 503 have an inner arc surface and an outer arc surface. When the airflow entering the cylinder 401 flows through the guide fins 503, a pressure difference can be generated at the inner and outer arc surfaces of the guide fins 503, and then the airflow can be effectively guided so that the airflow can drive the adsorption column body 501 to rotate, and 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 fins 503 contacts the edge of the air inlet opening 402, under the action of its arc, it can also slide along with the trend, and the angle of the adsorption column body 501 is slightly adjusted, so that the adsorption column body 501 can be just stuck at the air inlet opening 402 for sealing.

[0031] The adsorption component 5 is located inside the separation cylinder component 4, which can make the tail gas form a relatively stable airflow path in the cylinder 401, so that the impurities in the tail gas can be more fully contacted with the adsorption component 5, thereby improving the adsorption efficiency of the adsorption component 5 on impurities and effectively removing harmful substances in the tail gas. A filter screen is set 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 layer of filter screen can further intercept impurities and prevent them from entering the gas storage tank, avoid impurities accumulating in the gas storage tank and affecting the gas quality, and provide double protection for the purity of the gas in the gas storage tank. Regularly back-blowing and cleaning the cylinder 401 is relatively simple and convenient to operate. Back-blowing and cleaning can effectively remove impurities remaining on the cylinder 401, so that the cylinder 401 maintains good filtering performance and prolongs its service life. In addition, the impurities remaining in the cylinder 401 are uniformly sent to the subsequent impurity collection component 6, which is convenient for centralized treatment of impurities and is conducive to keeping the entire system clean and operating normally.

[0032] Through the dual effects of the adsorption component 5 and the separation cylinder component 4, the re-entry of impurities into the recovery gas storage tank 1 is prevented, thereby protecting the recovery gas storage tank 1 and the gas inside it from contamination. Furthermore, it helps to reduce the moisture and impurities contained in the tail gas recovered inside the recovery device, effectively preventing adverse effects on the subsequent cryogenic process. This design forms a relatively independent and complete impurity treatment unit. From the adsorption to the filtration and then to the cleaning and collection of impurities, each link is closely coordinated, which helps to optimize the performance of the entire tail gas treatment system, improve the stability and reliability of the system, and ensure its long-term efficient operation.

[0033] A flow guiding component 3 is installed on the inner wall of the recovery gas storage tank 1. The flow guiding component 3 is used to guide the airflow inside the recovery gas storage tank 1, and the flow guiding component 3 corresponds one-to-one with the separation cylinder component 4. The flow guiding component 3 includes a flow guiding plate 301. The flow guiding plate 301 is fixedly connected to the inner wall of the recovery gas storage tank 1. The flow guiding plate 301 inclines inward to form a contraction channel, guiding the airflow to accelerate the flow, and is used to direct the gas inside the recovery gas storage tank 1 towards the air inlet opening 402. There is still a certain distance between the side of the flow guiding plate 301 and the cylinder 401. Part of the gas enters the air inlet opening 402, and part of the gas flows backward through the gap between the flow guiding plate 301 and the cylinder 401 to receive the flow guiding effect of the next set of flow guiding components 3. The side of the flow guiding plate 301 is equally spaced with flow guiding inclined grooves 302. The flow guiding inclined grooves 302 are used to make the airflow pass through the flow guiding plate 301 more smoothly, reduce airflow turbulence, and improve the flow efficiency of the airflow. Moreover, the flow guiding inclined grooves 302 gradually incline downward from the side far away from the separation cylinder component 4 to the side close to the separation cylinder component 4, and can gradually guide the upper airflow downward.

[0034] An impurity collection component 6 is installed at the bottom of the recovery gas storage tank 1. The impurity collection component 6 is used to store the separated impurities. The impurity collection component 6 includes an impurity collection chamber 601. A second filter screen plate 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 end of the fan 603 is communicated with the impurity collection component 6, and the air inlet end of the fan 603 is located above the second filter screen plate 602. The air outlet end of the fan 603 is communicated with the recovery gas storage tank 1. A valve and a discharge port are provided at the bottom of the impurity collection chamber 601 for discharging the impurities existing inside the impurity collection chamber 601 to the outside.

[0035] The second filter plate 602 divides the space inside the impurity collection chamber 601 into upper and lower cavities. The outlet ends of the sewage discharge pipe 205 and 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. Under the filtering action of the second filter plate 602, the impurities remain below, and the gas can pass through the second filter plate 602 to enter the upper cavity. The air inlet end of the fan 603 is connected to the upper cavity, which can pump the filtered gas back into the inside of the recovery gas storage tank 1 again to form a cycle, effectively preventing the gas from leaking outwards.

[0036] An exhaust pipe 8 is fixedly connected to the outer wall of the recovery gas storage tank 1. The exhaust pipe 8 is communicated with the inner cavity of the recovery gas storage tank 1 and is used to introduce the waste gas inside the recovery gas storage tank 1 into the subsequent cryogenic process treatment equipment for recovery treatment.

[0037] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A cryogenic process recovery device based on alkylation reaction tail gas, characterized in that It includes a recovery gas storage tank, inside which a cyclone separation component is coaxially installed. The cyclone separation component is used for the preliminary separation treatment of impurities in the alkylation reaction tail gas. The cyclone separation component includes a cyclone separation chamber, and the cyclone separation chamber is fixedly connected to the recovery gas storage tank. The outer wall of the cyclone separation chamber is provided with a separation cylinder component, and the separation cylinder components are distributed in an annular array about the outer wall of the cyclone separation component. The inner wall of the recovery gas storage tank is provided with a diversion component, which is used for diverting the airflow inside the recovery gas storage tank, and the diversion component corresponds to the separation cylinder component one by one. An adsorption component is installed inside the separation cylinder component, which is used for further adsorption treatment of the remaining impurities in the alkylation reaction tail gas of the recovery gas storage tank. A impurity collection component is installed at the bottom of the recovery gas storage tank, and the impurity collection component is used for storing the separated impurities; The separation cylinder component includes a cylinder, the cylinder is fixedly connected to the outer wall of the cyclone separation chamber. An air inlet opening is provided on one side of the cylinder, and a first filter screen plate 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 communicated with the impurity collection component. A fan is installed on the top of the recovery gas storage tank, and an exhaust pipe is fixedly connected to the outer wall of the recovery gas storage tank.

2. The cryogenic process recovery device based on alkylation reaction tail gas according to claim 1, characterized in that, A waste discharge opening is provided at the bottom end of the cylinder, and the waste discharge opening is communicated with the waste discharge channel. The inner wall of the waste discharge opening gradually inclines inwards from top to bottom.

3. The cryogenic process recovery device based on the tail gas of the alkylation reaction according to claim 1, characterized in that, An upper sliding groove is provided on the inner wall of the top of the cylinder, and a lower sliding groove is provided on the inner wall of the bottom of the cylinder.

4. The cryogenic process recovery device based on the tail gas of the alkylation reaction according to claim 1, characterized in that, The adsorption component includes an adsorption column body, and the diameter dimension of the adsorption column body is smaller than the opening dimension of the air inlet opening.

5. The cryogenic process recovery device based on the tail gas of the alkylation reaction according to claim 4, characterized in that, A rotating shaft penetrates through the inside of the adsorption column body, and the adsorption column body is rotationally connected with the rotating shaft. Guide vanes are fixedly connected to the outer wall of the adsorption column body. The guide vanes are distributed in an annular array about the outer wall of the adsorption column body, and the cross-sectional shape of the guide vanes is set as a horn shape.

6. The cryogenic process recovery device based on the tail gas of the alkylation reaction according to claim 4, wherein 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.

7. The cryogenic process recovery device based on the tail gas of the alkylation reaction according to claim 6, characterized in that, A blocking baffle is sleeved at the bottom of the rotating shaft, and the blocking baffle is fixedly connected to the lower slider. The blocking baffle is used for controlling the opening and closing of the waste discharge opening.

8. The cryogenic process recovery device based on alkylation reaction tail gas according to claim 1, wherein The diversion component includes a diversion plate, the diversion plate is fixedly connected to the inner wall of the recovery gas storage tank. Diversion inclined grooves are equally spaced on the side of the diversion plate, and the diversion inclined grooves gradually incline downwards from the side far away from the separation cylinder component to the side close to the separation cylinder component.

9. The deep cooling process recovery device based on alkylation reaction tail gas according to claim 1, characterized in that, The impurity collection component includes an impurity collection chamber, a second filter screen plate is fixedly connected inside the impurity collection chamber. A blower is installed on the side of the impurity collection chamber. The air inlet end of the blower is communicated with the impurity collection component, and the air inlet end of the blower is located above the second filter screen plate. The air outlet end of the blower is communicated with the recovery gas storage tank.

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

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