A membrane cryogenic coupled separation and purification device for multiple gases

Abstract

The present application discloses a membrane cryogenic coupling separation and purification device for multiple gases, which belongs to the field of natural gas cryogenic separation technology, including a cryogenic reactor and a cryogenic membrane assembly arranged inside the cryogenic reactor; the cryogenic membrane assembly includes a sealing bearing, a filter membrane layer is connected to the inner cavity of the sealing bearing, a longitudinal seat body is arranged above the filter membrane layer, a fixed bracket fixed in the inner cavity of the cryogenic reactor is connected to the longitudinal seat body, and a static treatment structure is arranged at the bottom of the longitudinal seat body. Before the prepared liquefied natural gas is output from the output port of the cryogenic reactor, the residual water in the natural gas can be combined with the natural gas through the cryogenic membrane assembly arranged inside the cryogenic reactor to generate natural gas hydrates for interception and filtration, and when the cryogenic membrane assembly is blocked during the natural gas cryogenic separation process, the blockage is cleared by sensing the change of the hydraulic pressure inside the cryogenic reactor, so that the natural gas cryogenic separation process can be carried out smoothly and smoothly.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas cryogenic separation, and more specifically, to a membrane cryogenic coupled separation and purification device for multiple gases. Background Art

[0002] Natural gas cryogenic separation is a process of using the difference in boiling points of natural gas components to separate and recover certain components at low temperatures below -100°C. In industry, low-temperature freezing below -100°C is usually called deep freezing, or cryogenic for short. In natural gas chemical industry, cryogenic separation is used to separate, purify and recover C2 and above hydrocarbons in wet natural gas, namely natural gas condensate (NGL), that is, to produce liquefied natural gas, to facilitate the storage and transportation of natural gas.

[0003] Natural gas contains water when it is extracted from oil and gas wells. Before the extracted natural gas is subjected to cryogenic separation, it needs to be dehydrated by a gas-liquid separator. The current method of removing water from natural gas by a gas-liquid separator has a high water removal rate, but it cannot achieve 100% removal of the water mixed in the natural gas, especially when dealing with natural gas with a high water content. This causes the natural gas with residual water to combine with liquid water to form natural gas hydrate particles during the cryogenic separation process due to the significant reduction in the temperature of the natural gas. These natural gas hydrate particles are prone to block the valves and pipelines of the cryogenic separation equipment when flowing with the produced liquefied natural gas, which can easily damage the equipment and interrupt the natural gas production process, reducing the production efficiency of natural gas. For large natural gas processing plants, such interruptions may cause huge economic losses.

[0004] In view of this, we propose a membrane cryogenically coupled separation and purification device for multiple gases. Summary of the invention

[0005] Technical problem to be solved: The purpose of this application is to provide a membrane deep cold coupling separation and purification device for multiple gases, which solves the technical problems raised in the above background technology.

[0006] Technical solution: The technical solution of the present application provides a membrane cryogenic coupling separation and purification device for multiple gases, including a cryogenic reactor and a cryogenic membrane assembly arranged inside the cryogenic reactor;

[0007] The cryogenic membrane assembly includes a sealed bearing, a filter membrane layer is connected to the inner cavity of the sealed bearing, a longitudinal seat body is arranged above the filter membrane layer, a fixed bracket fixed to the inner cavity of the cryogenic reactor is connected to the longitudinal seat body, a high-pressure chamber, a matching chamber, a column chamber, a shunt airway and a negative pressure chamber connected to the column chamber at the top are arranged in sequence from top to bottom inside the longitudinal seat body, a static treatment structure is arranged at the bottom of the longitudinal seat body, a pressure relief pipeline connected to the shunt airway is also connected to the top of the longitudinal seat body, and a first solenoid valve is arranged on the pressure relief pipeline;

[0008] The top of the longitudinal seat body is connected to an embedded cylinder, a pressure-sensitive rod is inserted and sealed through the top of the embedded cylinder, a ring-shaped effervescent seat is connected to the outer periphery of the pressure-sensitive rod, a limit ring is connected to the outer periphery of the pressure-sensitive rod, a reset spring is also provided on the outer periphery of the pressure-sensitive rod, a waterproof and breathable membrane is connected to the outer periphery of the embedded cylinder, a liquid medium that can cooperate with the ring-shaped effervescent seat is filled in the embedded cylinder, a single-chip microcomputer and a pair of first trigger terminals are provided in the cooperation cavity, and a timer is electrically connected to the single-chip microcomputer;

[0009] An outer cylinder seat is sealingly and slidingly inserted in the column cavity, and an airtight plug ring is sealingly and slidingly connected to the negative pressure cavity. An inner rotating rod is slidingly inserted in the opening at the bottom end of the outer cylinder seat, and a passive gear is connected to the opening at the top end of the inner rotating rod. A driving thread strip that cooperates with the passive gear is inserted in the passive gear, and a tension spring is connected to the top end of the outer cylinder seat.

[0010] As an optional solution of the technical solution of this application document, the bottom end of the embedded cylinder extends into the high-pressure chamber;

[0011] One end of the return spring is connected to the limit ring, and the other end is connected to the bottom wall of the inner cavity of the embedded cylinder;

[0012] The bottom end of the pressure-sensitive rod passes through the bottom opening of the embedded cylinder and is sealed and inserted into the matching cavity;

[0013] The side wall of the waterproof and breathable membrane is connected to the side wall of the high-pressure chamber;

[0014] One of the pair of first trigger terminals is connected to the bottom end of the pressure-sensitive rod, and the other is electrically connected to the single-chip microcomputer;

[0015] The outer ring wall of the sealing bearing is connected to the side wall of the inner cavity of the cryogenic reactor.

[0016] As an optional solution of the technical solution of the present application document, when the return spring is in a relaxed state, the annular effervescent seat is located above the liquid medium.

[0017] As an optional solution of the technical solution of the present application document, when the two first trigger terminals are in contact, the trigger microcontroller controls the first solenoid valve to open after a time period preset by the timer.

[0018] As an optional solution of the technical solution of the present application document, one end of the shunt airway is connected to the high-pressure chamber, and the other end is connected to the top of the column chamber;

[0019] The communicating part between the shunt airway and the high pressure cavity is located above the waterproof breathable membrane.

[0020] As an optional solution of the technical solution of this application document, the top end of the tension spring is connected to the top end of the column cavity, and the bottom end is connected to the top end of the outer cylinder seat;

[0021] The bottom end of the built-in rotating rod is connected to the top surface of the filter membrane layer.

[0022] As an optional solution of the technical solution of the present application document, the bottom end of the negative pressure chamber passes through the bottom end of the longitudinal seat body and is connected with the inner cavity of the deep-cold reactor.

[0023] As an optional solution of the technical solution of the present application document, the static treatment structure includes a heat-conducting scraper fitted on the top surface of the filter membrane layer, the heat-conducting scraper is provided with an induction cavity and an electric heating cavity respectively inside, the induction cavity is connected with an elastic diaphragm, a pair of second trigger terminals are provided above the elastic diaphragm, and one of the second trigger terminals is connected to the elastic diaphragm, and the other second trigger terminal is connected to the top wall of the induction cavity, and the electric heating cavity is connected with an electric heating plate;

[0024] The top of the heat-conducting scraper is connected to a negative pressure pipeline, and a one-way air intake solenoid valve is provided on the negative pressure pipeline;

[0025] A side branch pipe is connected to the side wall of the negative pressure pipeline, and a one-way exhaust solenoid valve is also provided on the side branch pipe;

[0026] A conducting pipe is connected to the position of the side wall of the heat-conducting scraper strip corresponding to the position of the induction cavity, and a second solenoid valve is arranged on the conducting pipe.

[0027] As an optional solution of the technical solution of this application document, the bottom end of the negative pressure pipe passes through the top of the heat-conducting scraper and extends into the inside of the sensing cavity, and the top end of the negative pressure pipe passes through the inside of the longitudinal seat and is connected to the top of the negative pressure cavity;

[0028] The heat-conducting scraper strip is fixedly connected to the bottom of the longitudinal seat body.

[0029] As an optional solution of the technical solution of this application document, the connection point between the side branch pipe and the negative pressure pipe is located above the one-way air intake solenoid valve.

[0030] Beneficial effects: One or more technical solutions provided in the technical solution of the present application have at least the following technical effects or advantages: 1. When the prepared liquefied natural gas is discharged from the output port of the cryogenic reactor, the residual water in the natural gas is combined with the natural gas to form natural gas hydrate particles, which are intercepted and filtered by the filter membrane layer in the cryogenic membrane assembly, thereby preventing the natural gas hydrate particles from clogging the valves and pipelines of the cryogenic separation equipment, and when the filter membrane layer in the cryogenic membrane assembly is blocked during the natural gas cryogenic separation process, the prepared liquefied natural gas is blocked from passing through the filter membrane layer. After the hydraulic pressure inside the cryogenic reactor increases, when the hydraulic pressure inside the cryogenic reactor is greater than the preset critical value upper limit, the hydraulic pressure drives the annular effervescent seat to move downward and contact with the liquid medium, generating a large amount of carbon dioxide gas, which is then introduced into the column cavity through the bypass airway. After the gas pressure in the column cavity gradually increases, the driving thread strip is driven to move downward continuously, and the downward-moving driving thread strip drives the filter membrane layer to rotate through the passive gear, and then the natural gas hydrate particles accumulated on the surface of the filter membrane layer are scraped off by the heat-conducting scraper, so that the originally blocked part of the filter membrane layer is restored to be unblocked again, so that the produced liquefied natural gas can be discharged conveniently.

[0031] 2. When the deep-cold membrane component is blocked, the annular effervescent seat is driven to contact the liquid medium and release a large amount of carbon dioxide gas. The generated carbon dioxide gas drives the outer cylinder seat in the column cavity to move downward, so that the driving threaded strip that moves downward synchronously with the outer cylinder seat drives the filter membrane layer to rotate through the passive gear. At the same time, the airtight plug ring that moves downward synchronously with the outer cylinder seat can also continuously extract the gas in the sensing cavity through the negative pressure pipeline, so that the elastic diaphragm that undergoes elastic deformation drives the second trigger terminal connected thereto to contact with another second trigger terminal and trigger the electric heating plate to turn on. After the heat energy is transferred from the electric heating plate to the natural gas hydrate accumulated on the surface of the heat-conducting scraper, the natural gas hydrate is decomposed back into natural gas and water again, so that when the natural gas encounters hydrate particle blockage during the deep-cold processing, it can quickly return to the normal filtration speed, thereby improving the processing efficiency of the deep-cold processing of natural gas.

[0032] 3. After the hydrate particles that cause blockage to the filter membrane layer in the cryogenic membrane assembly are cleaned, so that the output of liquefied natural gas is restored to be smooth, the annular effervescent seat moves up and separates from the liquid medium under the elastic force of the return spring. Therefore, during the entire process of cryogenic treatment of natural gas, the filter membrane layer can be repeatedly cleaned when it is blocked, so as to ensure the smooth output of the liquefied natural gas formed after cryogenic treatment.

[0033] 4. In the process that the cryogenic membrane assembly is blocked and the annular effervescent seat is driven to contact with the liquid medium and the filter membrane layer is driven to rotate, the two first trigger terminals contact and trigger the single chip microcomputer to control the first solenoid valve to open after the time preset by the timer, and after the filter membrane layer rotates, due to the opening of the first solenoid valve, the air pressure in the plunger gradually decreases, and then under the elastic tension of the tension spring, the driving thread bar that moves synchronously with the outer cylinder seat moves upward relative to the passive gear, and drives the filter membrane layer to reverse again. While the driving thread bar moves synchronously with the outer cylinder seat, the airtight plug ring that also moves synchronously with the outer cylinder seat continuously discharges the gas in the negative pressure chamber through the side branch pipe, so that the natural gas hydrate accumulated on the surface of the filter membrane layer after being heated by the electric heating plate is scraped off in the reverse direction and decomposed back into natural gas and water after being heated, thereby improving the comprehensiveness and thoroughness of the cleaning of the hydrate particles that cause blockage, so that the cryogenic membrane assembly can maintain the smoothness of filtration for a longer time during the cryogenic treatment of natural gas, which is conducive to further improving the output fluency of the liquefied natural gas formed after cryogenic treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of this application.

[0035] Figure 2 This is a schematic diagram of the enlarged local structure of the cryogenic membrane assembly of this application.

[0036] Figure 3 Schematic diagram of the internal structure of the cryogenic reactor in this application.

[0037] Figure 4 It is a schematic diagram of the internal structure of the longitudinal seat body in this application.

[0038] Figure 5 Schematic diagram of the internal structure of the built-in rotating rod in this application.

[0039] Figure 6 Schematic diagram of the internal structure of the heat-conducting scraper in this application.

[0040] Explanation of the numbers in the figure: 100, cryogenic reactor; 201, filter membrane layer; 202, sealed bearing; 203, longitudinal seat; 204, heat-conducting scraper; 205, negative pressure pipeline; 206, one-way air inlet solenoid valve; 208, one-way exhaust solenoid valve; 210, built-in rotary rod; 212, elastic diaphragm; 213, airtight plug ring; 214, outer cylinder seat; 215, driving thread strip; 216, passive gear; 217, pressure-sensitive rod; 218, annular effervescent seat; 219, waterproof and breathable membrane; 220, first solenoid valve; 221, first trigger terminal; 222, single-chip microcomputer; 223, timer; 224, diversion airway; 225, electric heating plate; 226, second trigger terminal. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Reference Figures 1 to 5 , the embodiment of the present application provides a membrane cryogenic coupling separation and purification device for multiple gases, including a cryogenic reactor 100 and a cryogenic membrane assembly disposed inside the cryogenic reactor 100;

[0045] The cryogenic membrane assembly includes a sealing bearing 202, the outer ring wall of the sealing bearing 202 is connected to the side wall of the inner cavity of the cryogenic reactor 100, a filter membrane layer 201 is connected to the inner cavity of the sealing bearing 202, the filter membrane layer 201 is a filter plate, a longitudinal seat body 203 is arranged above the filter membrane layer 201, a fixing bracket fixed to the inner cavity of the cryogenic reactor 100 is connected to the longitudinal seat body 203, a high-pressure chamber, a matching chamber, a column chamber, a shunt airway 224 and a negative pressure chamber connected to the column chamber at the top are arranged in sequence from top to bottom inside the longitudinal seat body 203, and the bottom end of the negative pressure chamber passes through the bottom end of the longitudinal seat body 203 and is connected to the inner cavity of the cryogenic reactor 100;

[0046] One end of the split air channel 224 is connected to the high pressure chamber, and the other end is connected to the top of the column chamber;

[0047] The bottom of the longitudinal seat body 203 is provided with a static treatment structure, and the top of the longitudinal seat body 203 is also connected to a pressure relief pipe connected to the diversion airway 224, and the pressure relief pipe is provided with a first solenoid valve 220;

[0048] The top of the longitudinal seat body 203 is connected with an embedded cylinder, the bottom end of the embedded cylinder extends into the high-pressure cavity, a pressure-sensitive rod 217 is inserted and sealed through the top of the embedded cylinder, the bottom end of the pressure-sensitive rod 217 passes through the bottom opening of the embedded cylinder and is sealed and inserted into the matching cavity, a ring-shaped effervescent seat 218 is connected to the outer periphery of the pressure-sensitive rod 217, and the ring-shaped effervescent seat 218 is formed by pressing an effervescent disintegrant, a limit ring is sheathed on the outer surface of the pressure-sensitive rod 217, and a return spring is also sheathed on the outer surface of the pressure-sensitive rod 217, one end of the return spring is connected to the limit ring, and the other end is connected to the bottom wall of the inner cavity of the embedded cylinder;

[0049] The inner cylinder body is outer-connected with a waterproof breathable membrane 219, and the connecting part of the diverter air passage 224 and the high-pressure chamber is located above the waterproof breathable membrane 219;

[0050] The side wall of the waterproof and breathable membrane 219 is connected to the side wall of the high-pressure chamber. The embedded cylinder is filled with a liquid medium that can cooperate with the annular effervescent seat 218. The liquid medium is liquid water. When the return spring is in a relaxed state, the annular effervescent seat 218 is located above the liquid medium.

[0051] A single-chip microcomputer 222 and a pair of first trigger terminals 221 are provided in the matching cavity. One of the first trigger terminals 221 is connected to the bottom end of the pressure-sensitive rod 217, and the other is electrically connected to the single-chip microcomputer 222. The single-chip microcomputer 222 is electrically connected to a timer 223.

[0052] When the two first trigger terminals 221 are in contact, the microcontroller 222 is triggered to control the first solenoid valve 220 to open after a time period preset by the timer 223 has elapsed;

[0053] An outer cylinder seat 214 is inserted into the column cavity in a sealing and sliding manner. An outer sleeve of the outer cylinder seat 214 is connected to an airtight plug ring 213 which is sealingly and slidingly connected to the negative pressure cavity. An inner rotating rod 210 is inserted into the bottom opening of the outer cylinder seat 214 in a sliding manner. The bottom end of the inner rotating rod 210 is connected to the top surface of the filter membrane layer 201.

[0054] A passive gear 216 is connected to the opening at the top of the built-in rotating rod 210. A driving thread 215 is inserted into the passive gear 216 to cooperate with it. The driving thread 215 passes through the central screw hole of the passive gear 216 and drives the passive gear 216 to rotate through the thread. A tension spring is connected to the top of the outer cylinder seat 214. The top of the tension spring is connected to the top of the column cavity, and the bottom end is connected to the top of the outer cylinder seat 214.

[0055] Reference Figure 1 , Figure 2 , Figure 6 ,,The embodiment of the present application provides a membrane deep cold coupling separation and purification device for multiple gases, wherein the static treatment structure comprises a heat-conducting scraper 204 attached to the top surface of the filter membrane layer 201, and the heat-conducting scraper 204 is fixedly connected to the bottom of the longitudinal seat 203;

[0056] After the natural gas to be cryogenically treated is introduced into the cryogenic reactor 100 through the feed port of the cryogenic reactor 100 in batches and in a quantitative manner, when the obtained liquefied natural gas is discharged from the output port of the cryogenic reactor 100, the natural gas hydrate particles generated by the combination of the residual water in the natural gas and the natural gas are intercepted and filtered by the filter membrane layer 201 in the cryogenic membrane assembly, so as to prevent the natural gas hydrate particles from clogging the valves and pipelines of the cryogenic separation equipment. In addition, when the filter membrane layer 201 in the cryogenic membrane assembly is clogged during the cryogenic separation process of the natural gas, the obtained liquefied natural gas is blocked from passing through the filter membrane layer 201, so that the inside of the cryogenic reactor 100 is blocked. After the hydraulic pressure increases, when the internal hydraulic pressure of the cryogenic reactor 100 is greater than the preset critical value upper limit, the hydraulically driven annular effervescent seat 218 moves downward and contacts the liquid medium, generating a large amount of carbon dioxide gas, which is then introduced into the column cavity through the bypass gas channel 224. After the gas pressure in the column cavity gradually increases, the driving thread bar 215 is driven to move downward continuously, and the downward driving thread bar 215 drives the filter membrane layer 201 to rotate through the passive gear 216, and then the heat-conducting scraper bar 204 scrapes off the natural gas hydrate particles accumulated on the surface of the filter membrane layer 201, so that the originally blocked part of the filter membrane layer 201 is restored to be unblocked again, which facilitates the discharge of the obtained liquefied natural gas;

[0057] The heat-conducting scraper 204 is provided with an induction cavity and an electric heating cavity, the induction cavity is connected with an elastic diaphragm 212, a pair of second trigger terminals 226 are provided above the elastic diaphragm 212, one of the second trigger terminals 226 is connected to the elastic diaphragm 212, and the other second trigger terminal 226 is connected to the top wall of the induction cavity, and the electric heating cavity is connected with an electric heating plate 225;

[0058] The top of the heat-conducting scraper 204 is connected to a negative pressure pipe 205, the bottom end of the negative pressure pipe 205 passes through the top of the heat-conducting scraper 204 and extends into the induction cavity, the top end of the negative pressure pipe 205 passes into the interior of the longitudinal seat 203 and is connected to the top of the negative pressure cavity, and a one-way air intake solenoid valve 206 is provided on the negative pressure pipe 205;

[0059] Reference Figures 1 to 6When the deep-cold membrane assembly is blocked, the annular effervescent seat 218 is driven to contact the liquid medium and release a large amount of carbon dioxide gas. The generated carbon dioxide gas drives the outer cylinder seat 214 in the column cavity to move downward, so that the driving threaded strip 215 that moves downward synchronously with the outer cylinder seat 214 drives the filter membrane layer 201 to rotate through the passive gear 216. At the same time, the airtight plug ring 213 that moves downward synchronously with the outer cylinder seat 214 can also continuously extract the gas in the sensing cavity through the negative pressure pipeline 205, so that the elastic diaphragm 212 that undergoes elastic deformation drives the second trigger terminal 226 connected thereto to contact with another second trigger terminal 226 and trigger the electric heating plate 225 to turn on. After the heat energy is transferred from the electric heating plate 225 to the natural gas hydrate accumulated on the surface of the heat-conducting scraper 204, the natural gas hydrate is decomposed back into natural gas and water again, so that when the natural gas encounters hydrate particle blockage during the deep-cold processing, it can quickly recover to a normal filtration speed, thereby improving the processing efficiency of the deep-cold processing of natural gas.

[0060] After the hydrate particles in the cryogenic membrane assembly that cause blockage to the filter membrane layer 201 are cleaned, so that the output of the liquefied natural gas is restored to be smooth, the annular effervescent seat 218 moves up and separates from the liquid medium under the elastic force of the return spring. Therefore, during the entire process of cryogenic treatment of natural gas, the filter membrane layer 201 can be repeatedly cleaned when it is blocked, so as to ensure the smooth output of the liquefied natural gas formed after the cryogenic treatment.

[0061] A side branch pipe is connected to the side wall of the negative pressure pipe 205, and the connection between the side branch pipe and the negative pressure pipe 205 is located above the one-way air intake solenoid valve 206. A one-way exhaust solenoid valve 208 is also provided on the side branch pipe. A conducting pipe is also connected to the side wall of the thermal scraper 204 corresponding to the position of the sensing cavity, and a second solenoid valve is provided on the conducting pipe.

[0062] In the process that the cryogenic membrane assembly is blocked and the annular effervescent seat 218 is driven to contact with the liquid medium and drive the filter membrane layer 201 to rotate, the two first trigger terminals 221 contact and trigger the single chip computer 222 to control the first solenoid valve 220 to open after the time preset by the timer 223, and after the filter membrane layer 201 rotates, the air pressure in the plunger gradually decreases due to the opening of the first solenoid valve 220, and then under the elastic tension of the tension spring, the driving thread 215 that moves synchronously with the outer cylinder seat 214 moves up relative to the passive gear 216, and drives the filter membrane layer 201 to reverse again, and the driving thread 215 is turned off. While the strip 215 moves upward synchronously with the outer cylinder seat 214, the airtight plug ring 213, which also moves upward synchronously with the outer cylinder seat 214, continuously discharges the gas in the negative pressure chamber through the side branch pipe, so that 204 heated by the electric heating plate 225 can scrape off the natural gas hydrate accumulated on the surface of the filter membrane layer 201 in the reverse direction and decompose it back into natural gas and water after heating, thereby improving the comprehensiveness and thoroughness of the cleaning of the hydrate particles that cause blockage, so that the cryogenic membrane assembly can maintain the smoothness of filtration for a longer time during the cryogenic treatment of natural gas, which is conducive to further improving the output smoothness of the liquefied natural gas formed after the cryogenic treatment.

[0063] The one-way air intake solenoid valve 206, the one-way air exhaust solenoid valve 208, the second solenoid valve and the electric heating plate 225 are all electrically connected to an external main controller. The opening and closing of the second solenoid valve, the one-way air intake solenoid valve 206 and the one-way exhaust solenoid valve 208 are controlled by the main controller, and the heating temperature of the electric heating plate 225 is controlled by the main controller. The main controller is a common existing technology such as a computer that plays a control role.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A membrane cryogenic coupled separation and purification device for multiple gases, characterized in that: It comprises a cryogenic reaction kettle (100) and a cryogenic membrane assembly arranged inside the cryogenic reaction kettle (100); The cryogenic membrane assembly comprises a sealing bearing (202), a filter membrane layer (201) is connected to the inner cavity of the sealing bearing (202), a longitudinal seat body (203) is provided above the filter membrane layer (201), a fixing bracket fixed to the inner cavity of the cryogenic reactor (100) is connected to the longitudinal seat body (203), a high-pressure chamber, a matching chamber, a column chamber and a negative-pressure chamber connected to the column chamber at the top are provided in sequence from top to bottom inside the longitudinal seat body (203), a static treatment structure is provided at the bottom of the longitudinal seat body (203), a pressure relief pipe connected to the diversion airway (224) is also connected to the top of the longitudinal seat body (203), and a first solenoid valve (220) is provided on the pressure relief pipe; The top of the longitudinal seat (203) is connected to an embedded cylinder, a pressure-sensitive rod (217) is inserted and sealed through the top of the embedded cylinder, a ring-shaped effervescent seat (218) is connected to the outer periphery of the pressure-sensitive rod (217), a limit ring is connected to the outer sleeve of the pressure-sensitive rod (217), a reset spring is also provided on the outer sleeve of the pressure-sensitive rod (217), a waterproof and breathable membrane (219) is connected to the outer sleeve of the embedded cylinder, a liquid medium that can cooperate with the ring-shaped effervescent seat (218) is filled in the embedded cylinder, a single-chip computer (222) and a pair of first trigger terminals (221) are provided in the cooperation cavity, and a timer (223) is electrically connected to the single-chip computer (222); An outer cylinder seat (214) is inserted in a sealing and sliding manner in the column cavity, an outer sleeve of the outer cylinder seat (214) is connected to a gas-tight plug ring (213) which is sealing and slidingly connected to the negative pressure cavity, an inner rotating rod (210) is inserted in a sliding manner in the bottom opening of the outer cylinder seat (214), a passive gear (216) is connected to the top opening of the inner rotating rod (210), a driving thread strip (215) which cooperates with the passive gear (216) is inserted in the passive gear (216), and a tension spring is connected to the top of the outer cylinder seat (214); One end of the split air channel (224) is connected to the high-pressure chamber, and the other end is connected to the top of the column chamber; The portion where the diversion air channel (224) communicates with the high-pressure chamber is located above the waterproof breathable membrane (219); The top end of the tension spring is connected to the top end of the column cavity, and the bottom end is connected to the top end of the outer cylinder seat (214); The bottom end of the built-in rotating rod (210) is connected to the top surface of the filter membrane layer (201); The bottom end of the negative pressure chamber passes through the bottom end of the longitudinal seat body (203) and is connected to the inner cavity of the cryogenic reactor (100); The static treatment structure comprises a heat-conducting scraper (204) disposed on the top surface of the filter membrane layer (201), wherein an induction cavity and an electric heating cavity are respectively disposed inside the heat-conducting scraper (204), wherein an elastic diaphragm (212) is connected inside the induction cavity, and a pair of second trigger terminals (226) are disposed above the elastic diaphragm (212), wherein one of the second trigger terminals (226) is connected to the elastic diaphragm (212), and the other second trigger terminal (226) is connected to the top wall of the induction cavity, and wherein an electric heating plate (225) is connected inside the electric heating cavity; The top of the heat-conducting scraper (204) is connected to a negative pressure pipeline (205), and a one-way air intake solenoid valve (206) is provided on the negative pressure pipeline (205); A side branch pipe is connected to the side wall of the negative pressure pipe (205), and a one-way exhaust solenoid valve (208) is also provided on the side branch pipe; A conducting pipe is also connected to a position corresponding to the position of the sensing cavity on the side wall of the heat-conducting scraper (204), and a second solenoid valve is provided on the conducting pipe.

2. The membrane cryogenic coupled separation and purification device for multiple gases according to claim 1, characterized in that: The bottom end of the embedded cylinder extends into the high-pressure chamber; One end of the return spring is connected to the limit ring, and the other end is connected to the bottom wall of the inner cavity of the embedded cylinder; The bottom end of the pressure-sensing rod (217) passes through the bottom opening of the embedded cylinder and is sealed and inserted into the matching cavity; The side wall of the waterproof and breathable membrane (219) is connected to the side wall of the high-pressure chamber; One of the pair of first trigger terminals (221) is connected to the bottom end of the pressure-sensitive rod (217), and the other is electrically connected to the single-chip computer (222); The outer ring wall of the sealed bearing (202) is connected to the inner cavity side wall of the cryogenic reactor (100).

3. The membrane cryogenic coupled separation and purification device for multiple gases according to claim 1, characterized in that: When the return spring is in a relaxed state, the annular effervescent seat (218) is located above the liquid medium.

4. The membrane cryogenic coupled separation and purification device for multiple gases according to claim 2, characterized in that: When the two first trigger terminals (221) are in contact, the single chip microcomputer (222) is triggered to control the first solenoid valve (220) to open after a time period preset by the timer (223) has elapsed.

5. The membrane cryogenic coupled separation and purification device for multiple gases according to claim 1, characterized in that: The bottom end of the negative pressure pipe (205) passes through the top of the heat-conducting scraper (204) and extends into the interior of the sensing cavity, and the top end of the negative pressure pipe (205) passes into the interior of the longitudinal seat (203) and communicates with the top end of the negative pressure cavity; The heat-conducting scraper strip (204) is fixedly connected to the bottom of the longitudinal seat body (203).

6. The membrane cryogenic coupled separation and purification device for multiple gases according to claim 1, characterized in that: The connection portion between the side branch pipe and the negative pressure pipe (205) is located above the one-way air intake solenoid valve (206).

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