Intelligent enrichment and separation system and method for low-concentration CO2

Abstract

The invention discloses an intelligent enrichment and separation system for low-concentration CO2. The intelligent enrichment and separation system comprises a gas enrichment and separation module, a gas conveying and storage module, a gas data sensing and transmission module and an intelligent control module. The gas enrichment and separation module comprises a CO2 enrichment module, a CO2 separation module and a sealing device, enrichment and separation of CO2 in environmental gas are completed through a specified gas selective adsorption type molecular sieve membrane in the module, and the gas conveying and storage module comprises a small cyclone dust collector, a pneumatic pump, a gas conveying pipeline, a CO2 storage tank, a pressure gauge and a safety valve, the gas data sensing and transmission module senses gas signals through the pressure sensor and the CO2 partial pressure sensor and transmits the gas signals to the data processor, the intelligent control module receives the signals of the data processor, the signals are analyzed and processed by the intelligent programmable controller, and the CO2 enrichment and separation process is fed back by controlling the opening and closing degree of the electromagnetic valve. The system is high in intelligent degree, and can automatically complete the enrichment and separation functions of low-concentration CO2.

Description

Technical field:

[0001] The present invention relates to CO2 enrichment and separation technology, in particular to a low-concentration CO2 intelligent enrichment and separation system and method. Technical background:

[0002] With global warming posing a serious threat to Earth's life system, strictly controlling CO2 emissions to minimize greenhouse gas output has become a consensus choice for countries around the world. Currently, CO2 emissions are still mainly waste gas emissions generated by the combustion and utilization of fossil fuels. For gases rich in high concentrations of CO2, such as coal chemical industry and power plant flue gas, there are already many technologies and methods to effectively enrich CO2 in them (CN202310731363.1; CN202220997314.3; CN201520556223.6). However, gases rich in low concentrations of CO2, such as those in coal mine return air, lack corresponding treatment and are directly discharged into the atmosphere, which also leads to the indiscriminate emission of tens of millions of tons of CO2 gas annually in underground mines.

[0003] Conventional enrichment and separation technologies for the enrichment and separation of low-concentration CO2 gases often face challenges with high energy consumption and low separation efficiency. The purity of the separated CO2 gas cannot be guaranteed, and the absorption tower absorption method can result in the presence of pollutants such as ammonia in the exhaust flue gas. Molecular sieves, as porous materials with large specific surface areas, are capable of efficiently adsorbing and desorbing gas molecules through physical and chemical methods. In recent years, numerous researchers have developed molecular sieve materials that can "precisely" capture and "largely" adsorb specific gases, providing more selective methods for the enrichment and separation of low-concentration CO2 gases.

[0004] Based on this, the present invention provides a low-concentration CO2 intelligent enrichment and separation system and method. This system can achieve intelligent control of CO2 enrichment and separation at a specific concentration, while minimizing energy consumption and significantly reducing carbon emissions from large-volume, low-concentration CO2-enriched gas. This system offers significant economic benefits and broad application prospects. Summary of the invention:

[0005] The purpose of the present invention is to provide a low-concentration CO2 intelligent enrichment and separation system and method, which utilizes the selective adsorption characteristics of molecular sieves for different gas molecules under certain conditions to intelligently enrich and separate low-concentration CO2. The system does not require human operation and can achieve intelligent capture of CO2 at a specified concentration with high reliability.

[0006] In order to achieve the above objectives, the technical solution adopted by the present invention is: a low-concentration CO2 intelligent enrichment and separation system, including a gas enrichment and separation module, a gas transportation and storage module, a gas data sensing and transmission module and an intelligent control module.

[0007] The gas enrichment and separation module includes a CO2 enrichment module, a CO2 separation module and a sealing partition in the middle. The CO2 enrichment module is an enclosed space formed by multiple layers of CO2 selective adsorption MOFs molecular sieves, and the CO2 separation module is an enclosed space formed by multiple layers of gas selective adsorption molecular sieves to be separated. The CO2 enrichment module and the CO2 separation module are quickly and tightly connected to each other through threads, and are separated by a sealing partition in the middle. The molecular sieve is sealed from the surrounding area of ​​the module, and the airflow only passes through the molecular sieve.

[0008] The gas transportation and storage module includes a small cyclone dust collector and a gas transportation pipe I connected thereto, an air pressure pump I, a gas transportation pipe II, a gas transportation pipe III connected to the atmosphere at the end of the gas enrichment module, a gas transportation pipe IV connected to the air pressure pump II at the end of the gas separation module, an air pressure pump II and a gas transportation pipe V connected thereto, a liquid CO2 storage tank and a pressure gauge and a safety valve installed on the storage tank, and a gas transportation pipe VI connected to the atmosphere by a two-way branch on the transportation pipe V.

[0009] The gas data sensing module includes a data processor, a data transmission cable I, and a CO2 partial pressure pressure sensor I installed on a gas delivery pipe II, a gas pressure sensor installed on a gas enrichment module, a CO2 partial pressure pressure sensor II installed on a gas delivery pipe III, and a CO2 partial pressure pressure sensor III installed on a gas delivery pipe V, which are respectively connected to the data processor through the data transmission cable I.

[0010] The intelligent control module includes an intelligent programmable controller, a data transmission cable II, and a solenoid valve I installed on a gas delivery pipe II connected to the intelligent programmable controller through the data transmission cable II, a solenoid valve II installed on a sealing partition, a solenoid valve III installed on a gas delivery pipe III, a solenoid valve IV on a gas delivery pipe IV, a solenoid valve V installed on a gas delivery pipe V, and a solenoid valve VI installed on a gas delivery pipe VI.

[0011] Furthermore, the present invention provides that the data processor and the intelligent programmable controller are connected via a data transmission cable to transmit signals for processing data by the data processor.

[0012] The present invention further provides that the height a=65mm, width b=42.5mm, gas outlet diameter c=45.3mm, embedding depth d=65.2mm, straight pipe section diameter e=123mm, length f=125mm, diameter gradient section gradient angle θ=12.1°, ash outlet diameter g=33mm at the inlet of the small cyclone dust collector.

[0013] Furthermore, in the intelligent control module, the solenoid valve I is located after the CO2 partial pressure sensor I along the gas passage, the solenoid valve III is located after the CO2 partial pressure sensor II along the gas passage, and the solenoid valve V is located after the CO2 partial pressure sensor III and the double-pass on the gas delivery pipe V along the gas passage.

[0014] The present invention further provides a low-concentration CO2 intelligent enrichment and separation system, characterized in that the gas delivery pipes in the gas delivery and storage modules are all high-pressure resistant hoses.

[0015] Furthermore, the present invention provides that the gas enrichment and separation module can be modified and expanded on the existing basis, the sealing partition can be replaced by the isolation conveying pipeline VII, and multiple molecular sieve membranes can be quickly added or removed according to the enrichment capacity and separation speed of disposable CO2.

[0016] The present invention further provides that the intelligent programmable controller is pre-set with control programs for the CO2 gas enrichment process and the CO2 gas separation process, as well as a program for determining the optimal adsorption pressure of the CO2 selective adsorption MOFs molecular sieve at different ambient temperatures, and intelligent control parameters can be manually input.

[0017] The present invention also provides a low-concentration CO2 intelligent enrichment and separation method, comprising the following steps:

[0018] a. Analyze the percentage of various components in the working environment atmosphere other than CO2 gas. For gases with a percentage higher than 0.1%, select the corresponding high-efficiency and durable adsorption molecular sieve. Install the molecular sieve into the corresponding CO2 separation module. Install the CO2 selective adsorption MOFs molecular sieve into the CO2 enrichment module. Determine the number of molecular sieve membranes to be used in the CO2 enrichment module and the CO2 separation module based on the one-time enrichment capacity and separation rate of CO2 in the ambient gas.

[0019] b. Input the ambient temperature T1 and the preset CO2 percentage purity limit x in the CO2 storage tank into the intelligent programmable controller, quickly connect the CO2 enrichment module and the CO2 separation module through the sealed partition or the isolation transmission pipeline VII, install the other modules in the system, ensure that all solenoid valves and air pressure pumps are closed, and the data transmission cable is connected intact;

[0020] c. The system starts intelligent CO2 enrichment. The intelligent programmable controller controls the air pressure pump I and solenoid valves I and III to fully open. After dust removal, the external gas is adsorbed and enriched in the CO2 enrichment module. The total gas pressure sensor monitors the gas pressure inside the CO2 enrichment module and converts it into a digital signal, which is transmitted to the intelligent programmable controller. The intelligent controller selects the optimal CO2 enrichment pressure P1 at the current temperature T1 and controls the gas pressure inside the CO2 enrichment module until it reaches P1 by adjusting the opening of solenoid valve III.

[0021] d. The pressure ratio P2 / P3 of CO2 partial pressure sensors II and I can represent the saturation of CO2 adsorption by the CO2 selective adsorption MOFs molecular sieve. CO2 partial pressure sensors II and I monitor the CO2 partial pressure and convert it into a digital signal for transmission to the intelligent programmable controller. When the P2 / P3 value is less than 50% of the initial value, the CO2 enrichment module is considered to be saturated with adsorption. The intelligent programmable controller controls air pressure pump I to standby and controls solenoid valves I and III to close, thus ending the CO2 intelligent enrichment.

[0022] e. CO2 intelligent separation begins. The intelligent programmable controller controls air pressure pump II and solenoid valves II, IV, and V to open. The pressure ratio P4 / P5 of CO2 partial pressure sensor III and gas total pressure sensor can represent the degree of CO2 separation. CO2 partial pressure sensor III and gas total pressure sensor monitor gas pressure and convert it into digital signals for transmission to the intelligent programmable controller. When the P4 / P5 value reaches the preset CO2 percentage purity limit x, the intelligent programmable controller controls solenoid valve V to close and solenoid valve VI to open. Air pressure pump II extracts the residual gas in the gas enrichment and separation module. When P5 is lower than 3% of the initial value, it is determined that the residual gas is basically extracted, and CO2 intelligent separation ends. The intelligent programmable controller controls air pressure pump II to standby and solenoid valves II, IV, and VI to close. Description of the drawings:

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] Figure 1 Schematic diagram of low-concentration CO2 intelligent enrichment and separation system;

[0025] Figure 2 This is a schematic diagram of the modification and expansion of the gas enrichment and separation module;

[0026] Figure 3 This is a schematic diagram of the structure of a small cyclone dust collector;

[0027] In the figure, 1-small cyclone dust collector, 2-gas delivery pipe I, 3-air pressure pump I, 4-gas delivery pipe II, 5-gas delivery pipe III, 6-gas delivery pipe IV, 7-air pressure pump II, 8-gas delivery pipe V, 9-gas delivery pipe VI, 10-liquid CO2 storage tank, 11-CO2 enrichment module, 12-CO2 separation module, 13-CO2 selective adsorption MOFs molecular sieve membrane, 14-gas selective adsorption molecular sieve membrane to be separated, 15-sealing partition, 16-data processing 1-wire, 17-data transmission cable Ⅰ, 18-CO2 partial pressure pressure sensor Ⅰ, 19-pressure sensor, 20-CO2 partial pressure pressure sensor Ⅱ, 21-CO2 partial pressure pressure sensor Ⅲ, 22-intelligent programmable controller, 23-data transmission cable Ⅱ, 24-solenoid valve Ⅰ, 25-solenoid valve Ⅱ, 26-solenoid valve Ⅲ, 27-solenoid valve Ⅳ, 28-solenoid valve VI (28), 29-solenoid valve Ⅴ, 30-pressure gauge, 31-safety valve, 32-isolating delivery pipeline Ⅶ. Specific implementation method:

[0028] As attached Figure 1As shown, the low-concentration CO2 intelligent enrichment and separation system and method of the present invention includes a gas enrichment and separation module, a gas transportation and storage module, a gas data sensing and transmission module and an intelligent control module; the gas enrichment and separation module includes a CO2 enrichment module (11) and a CO2 separation module (12) and a sealing partition (15) in the middle, the CO2 enrichment module (11) is a closed space formed by blocking multiple layers of CO2 selective adsorption type MOFs molecular sieve membranes (13) inside, the CO2 separation module (12) is a closed space formed by blocking multiple layers of gas selective adsorption type molecular sieve membranes (14) to be separated inside, the CO2 enrichment module (11) The CO2 separation module (12) and the CO2 enrichment module (11) are quickly and tightly connected to each other through threads, and are separated by a sealing partition (15) in the middle. The molecular sieve membranes in the CO2 enrichment module (11) and the CO2 separation module (12) are sealed around the modules, and the wind flows only through the molecular sieve membranes; the gas delivery and storage module includes a small cyclone dust collector (1) and a gas delivery pipe I (2) connected thereto, an air pressure pump I (3), a gas delivery pipe II (4), a gas delivery pipe III (5) connected to the atmosphere at the end of the gas enrichment module, a gas delivery pipe IV (6) connected to the air pressure pump II (7) at the end of the gas separation module (12), an air pressure pump II (7) and a gas delivery pipe III (7) connected thereto. A delivery pipe V (8), a liquid CO2 storage tank (10) and a pressure gauge (30) and a safety valve (31) installed on the storage tank, and a gas delivery pipe VI (9) connected to the atmosphere by a double-way branch on the delivery pipe V (8); the gas data sensing module includes a data processor (16), a data transmission cable I (17), and a CO2 partial pressure pressure sensor I (18) installed on the gas delivery pipe II (4) connected to the data processor (16) through the data transmission cable I (17), a gas total pressure pressure sensor (19) installed on the gas enrichment module, a CO2 partial pressure pressure sensor II (20) installed on the gas delivery pipe III (5), and a gas delivery sensor. A CO2 partial pressure sensor III (21) is installed on the tube V (8); the intelligent control module includes an intelligent programmable controller (22), a data transmission cable II (23), and a solenoid valve I (24) installed on the gas delivery tube II (4) connected to the intelligent programmable controller (22) through the data transmission cable II (23), an opening solenoid valve II (25) installed on the sealing partition (15), a solenoid valve III (26) installed on the gas delivery tube III (5), a solenoid valve IV (27) on the gas delivery tube IV (6), a solenoid valve V (29) installed on the gas delivery tube V (8), and a solenoid valve VI (28) installed on the gas delivery tube VI (9).

[0029] In this embodiment, the data processor (16) transmits data processing signals to the intelligent programmable controller (22) via a data transmission cable.

[0030] In order to improve the dust removal efficiency before gas adsorption as much as possible, the structural parameters of the small cyclone dust collector are set in this embodiment, as shown in the attached figure. Figure 3 As shown, the small cyclone dust collector has a height of a=65mm, a width of b=42.5mm, a gas outlet diameter of c=45.3mm, an embedding depth of d=65.2mm, a straight pipe section diameter of e=123mm, a length of f=125mm, a diameter gradient section gradient angle θ=12.1°, and an ash outlet diameter g=33mm at the inlet.

[0031] In order to ensure that the solenoid valve can realize the function of opening and closing a specific gas path, this embodiment stipulates the position of the solenoid valve gas path, the solenoid valve I is located after the CO2 partial pressure pressure sensor I along the gas path, the solenoid valve III is located after the CO2 partial pressure pressure sensor II along the gas path, and the solenoid valve V is located after the CO2 partial pressure pressure sensor III and the double-pass on the gas delivery pipe V along the gas path.

[0032] In this embodiment, in order to ensure that the gas transmission process does not leak or inhale foreign gas, the gas transmission pipelines all use high-pressure resistant hoses.

[0033] In order to more quickly exert the function of the gas enrichment and separation module, in this embodiment, the gas enrichment and separation module can be modified and expanded on the existing basis, such as the attached Figure 2 As shown, the sealing partition can be replaced by the function of isolating the transport pipeline Ⅶ (32), and multiple molecular sieve membranes can be quickly added or removed according to the enrichment capacity and separation speed of disposable CO2.

[0034] In this embodiment, the intelligent programmable controller is preset with CO2 gas enrichment process and CO2 gas separation process control programs and the optimal adsorption pressure determination program of CO2 selective adsorption MOFs molecular sieve under different ambient temperatures, and intelligent control parameters can be manually input.

[0035] The present invention also provides a low-concentration CO2 intelligent enrichment and separation method, which specifically includes the following steps:

[0036] a. Analyze the percentage of various components other than CO2 gas in the low-concentration CO2 storage space. For gases with a percentage greater than 0.1%, select the corresponding high-efficiency and durable adsorption molecular sieve. Install the molecular sieve into the corresponding CO2 separation module. Install the CO2 selective adsorption MOFs molecular sieve into the CO2 enrichment module. Determine the number of CO2 enrichment modules and CO2 separation modules to be used based on the one-time enrichment capacity and separation rate of CO2 in the ambient gas.

[0037] b. Input the ambient temperature T1 and the preset CO2 percentage purity limit x in the CO2 storage tank (10) into the intelligent programmable controller (22), quickly connect the CO2 enrichment module (11) and the CO2 separation module (12) through the sealing partition (15) or the isolation delivery pipeline Ⅶ (32), install the other modules in the system, ensure that all solenoid valves and air pressure pumps are closed and the data transmission cable is connected intact;

[0038] c. The system starts intelligent CO2 enrichment. The intelligent programmable controller (22) controls the air pressure pump I (3) and the solenoid valves I (24) and III (26) to be fully opened. The external gas is dust-removed and then CO2 is adsorbed and enriched in the CO2 enrichment module (11). The total gas pressure sensor (19) monitors the internal gas pressure of the CO2 enrichment module (11) and converts it into a digital signal and transmits it to the intelligent programmable controller (22). The intelligent controller selects the optimal CO2 enrichment pressure P1 at the current temperature T1 and controls the gas pressure in the CO2 enrichment module (11) until P1 by adjusting the opening of the solenoid valve III (26).

[0039] d. The pressure ratio P2 / P3 of the CO2 partial pressure sensors II (20) and I (18) can represent the saturation degree of CO2 adsorption by the CO2 selective adsorption MOFs molecular sieve membrane. The CO2 partial pressure sensors II (20) and I (18) monitor the CO2 partial pressure and convert it into a digital signal and transmit it to the intelligent programmable controller (22). When the P2 / P3 value is lower than 50% of the initial value, the CO2 enrichment module (11) is considered to be adsorbed saturated. The intelligent programmable controller (22) controls the air pressure pump I (3) to standby and controls the solenoid valves I (24) and III (26) to close, and the CO2 intelligent enrichment ends.

[0040] e. CO2 intelligent separation begins, the intelligent programmable controller (22) controls the air pressure pump II (7) and the electromagnetic valves II (25), IV (27) and V (29) to open, the pressure ratio P4 / P5 of the sensors III (21) and (19) can represent the degree of CO2 separation, the sensors III (21) and (19) monitor the gas pressure and convert it into a digital signal and transmit it to the intelligent programmable controller (22), when the P4 / P5 value reaches the preset CO2 percentage purity limit x, the intelligent programmable controller (22) controls the electromagnetic valve V (29) to close, the electromagnetic valve VI (28) to open, the air pressure pump II (7) extracts the residual gas in the gas enrichment and separation module, when P5 is lower than 3% of the initial value, it is determined that the residual gas is basically extracted, and the CO2 intelligent separation ends, the intelligent programmable controller (22) controls the air pressure pump II (7) to standby, and the electromagnetic valves II (25), IV (27) and VI (28) are closed.

Claims

1. Low-concentration CO2 intelligent enrichment and separation system, characterized by: It includes gas enrichment and separation module, gas transportation and storage module, gas data sensing module and intelligent control module; The gas enrichment and separation module comprises a CO2 enrichment module (11), a CO2 separation module (12) and a sealing partition (15) in the middle. The CO2 enrichment module (11) is a closed space formed by blocking multiple layers of CO2 selective adsorption type MOFs molecular sieve membranes (13) in the interior. The CO2 separation module (12) is a closed space formed by blocking multiple layers of gas selective adsorption type molecular sieve membranes (14) to be separated in the interior. The CO2 enrichment module (11) and the CO2 separation module (12) are quickly and tightly connected to each other through threads and blocked by the sealing partition (15) in the middle. The molecular sieve membranes in the CO2 enrichment module (11) and the CO2 separation module (12) are sealed from the surroundings of the modules, and the airflow only passes through the molecular sieve membranes. The gas delivery and storage module comprises a small cyclone dust collector (1) and a gas delivery pipe I (2) connected thereto, an air pressure pump I (3), a gas delivery pipe II (4), a gas delivery pipe III (5) connected to the atmosphere at the end of the CO2 enrichment module (11), a gas delivery pipe IV (6) connected to the air pressure pump II (7) at the end of the CO2 separation module (12), the air pressure pump II (7) and a gas delivery pipe V (8) connected thereto, a liquid CO2 storage tank (10) and a pressure gauge (30) and a safety valve (31) installed on the storage tank, and a gas delivery pipe VI (9) connected to the atmosphere via a double-way branch on the delivery pipe V (8). The gas data sensing module comprises a data processor (16), a data transmission cable I (17), and a CO2 partial pressure sensor I (18) installed on a gas delivery pipe II (4), a gas total pressure sensor (19) installed on a CO2 enrichment module (11), a CO2 partial pressure sensor II (20) installed on a gas delivery pipe III (5), and a CO2 partial pressure sensor III (21) installed on a gas delivery pipe V (8), which are respectively connected to the data processor (16) through the data transmission cable I (17). The intelligent control module comprises an intelligent programmable controller (22), a data transmission cable II (23), and a solenoid valve I (24) installed on a gas delivery pipe II (4) connected to the intelligent programmable controller (22) via the data transmission cable II (23), an opening solenoid valve II (25) installed on a sealing partition (15), a solenoid valve III (26) installed on a gas delivery pipe III (5), a solenoid valve IV (27) on a gas delivery pipe IV (6), a solenoid valve V (29) installed on a gas delivery pipe V (8), and a solenoid valve VI (28) installed on a gas delivery pipe VI (9). The data processor (16) and the intelligent programmable controller (22) are connected via a data transmission cable to transmit signals for processing data by the data processor. The small cyclone dust collector (1) has an inlet height a=65mm, a width b=42.5mm, a gas outlet diameter c=45.3mm, an embedding depth d=65.2mm, a straight pipe section diameter e=123mm, a length f=125mm, a diameter gradient section gradient angle θ=12.1°, and an ash outlet diameter g=33mm. In the intelligent control module, the solenoid valve I (24) is located after the CO2 partial pressure sensor I (18) along the gas passage, the solenoid valve III (26) is located after the CO2 partial pressure sensor II (20) along the gas passage, and the solenoid valve V (29) is located after the CO2 partial pressure sensor III (21) and the double-pass valve on the gas delivery pipe V (8) along the gas passage.

2. The low-concentration CO2 intelligent enrichment and separation system according to claim 1 is characterized in that: The gas delivery pipes in the gas delivery and storage module are all high-pressure resistant hoses. The sealing partition (15) can be replaced by the isolation delivery pipeline Ⅶ (32). The gas enrichment and separation module can be expanded on the existing basis, and multiple molecular sieve membranes can be quickly added or removed according to the enrichment capacity and separation speed of disposable CO2.

3. The low-concentration CO2 intelligent enrichment and separation system according to claim 1 is characterized in that: The intelligent programmable controller (22) is preset with a CO2 gas enrichment process and a CO2 gas separation process control program and an optimal adsorption pressure determination program for a CO2 selective adsorption type MOFs molecular sieve membrane at different ambient temperatures, and can manually input intelligent control parameters.

4. The low-concentration CO2 intelligent enrichment and separation method according to claim 1, characterized in that: The following steps are involved: a. Analyze the percentage of various components in the working environment atmosphere except CO2 gas, select the corresponding high-efficiency and durable adsorption type molecular sieve membrane for the gas with a percentage higher than 0.1%, install the molecular sieve membrane into the corresponding CO2 separation module (12) according to claim 1, and install the CO2 selective adsorption type MOFs molecular sieve membrane into the CO2 enrichment module (11), and determine the number of molecular sieve membranes used in the CO2 enrichment module (11) and the CO2 separation module (12) according to the one-time enrichment capacity and separation speed of CO2 in the ambient gas; b. Input the ambient temperature T1 and the preset CO2 percentage purity limit x in the CO2 storage tank (10) into the intelligent programmable controller (22), quickly connect the CO2 enrichment module (11) and the CO2 separation module (12) through the sealing partition (15) or the isolation delivery pipeline Ⅶ (32), install the other modules in the system, ensure that all solenoid valves and air pressure pumps are closed and the data transmission cable is connected intact; c. The system starts intelligent CO2 enrichment. The intelligent programmable controller (22) controls the air pressure pump I (3) and the solenoid valves I (24) and III (26) to be fully opened. The external gas is dust-removed and then CO2 is adsorbed and enriched in the CO2 enrichment module (11). The total gas pressure sensor (19) monitors the internal gas pressure of the CO2 enrichment module (11) and converts it into a digital signal and transmits it to the intelligent programmable controller (22). The intelligent controller selects the optimal CO2 enrichment pressure P1 at the current temperature T1 and controls the gas pressure in the CO2 enrichment module (11) until P1 by adjusting the opening of the solenoid valve III (26). d. The pressure ratio P2 / P3 of the CO2 partial pressure sensors II (20) and I (18) can represent the saturation degree of CO2 adsorption by the CO2 selective adsorption MOFs molecular sieve membrane. The CO2 partial pressure sensors II (20) and I (18) monitor the CO2 partial pressure and convert it into a digital signal and transmit it to the intelligent programmable controller (22). When the P2 / P3 value is lower than 50% of the initial value, the CO2 enrichment module (11) is considered to be adsorbed saturated. The intelligent programmable controller (22) controls the air pressure pump I (3) to standby and controls the solenoid valves I (24) and III (26) to close, and the CO2 intelligent enrichment ends. e. CO2 intelligent separation begins, the intelligent programmable controller (22) controls the air pressure pump II (7) and the electromagnetic valves II (25), IV (27) and V (29) to open, the pressure ratio P4 / P5 of the sensors III (21) and (19) can represent the degree of CO2 separation, the sensors III (21) and (19) monitor the gas pressure and convert it into a digital signal and transmit it to the intelligent programmable controller (22), when the P4 / P5 value reaches the preset CO2 percentage purity limit x, the intelligent programmable controller (22) controls the electromagnetic valve V (29) to close, the electromagnetic valve VI (28) to open, the air pressure pump II (7) extracts the residual gas in the gas enrichment and separation module, when P5 is lower than 3% of the initial value, it is determined that the residual gas is basically extracted, and the CO2 intelligent separation ends, the intelligent programmable controller (22) controls the air pressure pump II (7) to standby, and the electromagnetic valves II (25), IV (27) and VI (28) are closed.

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