Device and method for purifying hydrogen from mixed gas

Abstract

The present invention discloses an apparatus and method for purifying hydrogen from a mixed gas, relating to the technical field of hydrogen purification, comprising a raw gas buffer tank, a first air pump fixedly installed on the top of the raw gas buffer tank, an air inlet pipe fixedly connected to the top of the first air pump, a first support rod fixedly installed on the pipeline of the air inlet pipe, a timer fixedly connected to the top of the first support rod, a first air outlet pipe fixedly connected to the tank body of the raw gas buffer tank, a first programmable valve fixedly installed on the pipeline of the first air outlet pipe, a first adsorption tower fixedly connected to the other end of the first air outlet pipe, and a second air outlet pipe fixedly connected to the side of the tank body of the raw gas buffer tank. The present invention utilizes a gas chromatograph to detect the purity of hydrogen inside a hydrogen storage reaction tank, and purifies the hydrogen in different ways according to the different purities of the detected hydrogen, so that the purity of the purified hydrogen meets the gas standard for hydrogen-powered vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen purification, and in particular to a device and method for purifying hydrogen from a mixed gas. Background Art

[0002] Mixed gas refers to a gas containing two or more effective components, or a gas that is a non-effective component but whose content exceeds the prescribed limit. It is a mixture of several gases and is a commonly used working fluid in engineering.

[0003] With the further development of new energy vehicle technology, fuel cells have become a new development direction for new energy vehicles. In fuel cells, hydrogen is the most important power source material. The purity requirements for hydrogen in fuel cells are very high. For example, impurity gases (CO, CO2, H2O, O2 and CH4) in hydrogen have a great impact on fuel cell performance. In addition, the purity requirement for hydrogen in metal organic chemical vapor deposition (MOCVD) must be above 6N. However, the current manufacturing cost of high-purity hydrogen is quite expensive, such as palladium membrane, pressure swing adsorption (PSA) and other methods, which increases the relative cost for back-end users.

[0004] Among them, in U.S. Patent No. 5,902,561, a two-stage process is used to remove impurity gases. Nickel crystals are used in the first stage, and metal absorbents are used in the second stage. The patent describes the absorption of impurities by nickel crystals and metal absorbents at a selected temperature, and the impurities are directly removed from the source gas to improve the purity of the hydrogen. However, this design requires the selection of different absorbents for different impurities, and multiple absorbents may have adverse effects on the purified hydrogen.

[0005] In existing mixed gas purification devices, external gases are easily mixed with hydrogen, affecting the purity of hydrogen and causing the hydrogen to fail to meet the gas standards for hydrogen-powered vehicles. Therefore, it is necessary to design a device and method for purifying hydrogen from mixed gases. Summary of the Invention

[0006] The object of the present invention is to provide an apparatus and method for purifying hydrogen from a mixed gas, so as to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an apparatus for purifying hydrogen from a mixed gas, comprising a raw gas buffer tank;

[0008] A first air pump, wherein the first air pump is fixedly mounted on the top of the raw gas buffer tank, an air inlet pipe is fixedly connected to the top of the first air pump, and a timer is provided on the air inlet pipe;

[0009] A first gas outlet pipe, wherein the first gas outlet pipe is fixedly connected to the tank body of the raw gas buffer tank, the other end of the first gas outlet pipe is fixedly connected to a first adsorption tower, a color sensor is provided inside the first adsorption tower, and a second gas outlet pipe is fixedly connected to the outside of the first adsorption tower, and a solenoid valve is fixedly installed on the pipe of the second gas outlet pipe;

[0010] The expansion valve is arranged inside the first adsorption tower, and the top of the expansion valve is fixedly connected to the evaporator

[0011] A second gas outlet pipe, the second gas outlet pipe is fixedly connected to the side of the tank body of the raw gas buffer tank, the other end of the second gas outlet pipe is fixedly connected to the hydrogen storage reaction tank, the tank body of the hydrogen storage reaction tank is fixedly connected to a third gas outlet pipe, and the other end of the third gas outlet pipe is fixedly connected to the second adsorption tower;

[0012] A connecting pipe, the connecting pipe is arranged above the hydrogen storage reaction tank, a gas chromatograph is provided on the pipeline of the connecting pipe, and the other end of the connecting pipe is fixedly connected to a second air pump;

[0013] A cold air pipe, the cold air pipe is fixedly connected to the pipe of the connecting pipe, and the other end of the cold air pipe is fixedly connected to the cold box;

[0014] A reflux pipe, the reflux pipe is fixedly connected to the pipe of the connecting pipe, and the other end of the reflux pipe is connected to the second adsorption tower;

[0015] The membrane separation reaction tank is fixedly connected to the other end of the connecting pipe. A third gas outlet pipe is fixedly connected to the tank body of the membrane separation reaction tank. The other end of the third gas outlet pipe is fixedly connected to the hydrogen storage tank.

[0016] According to the above technical solution, a first support rod is fixedly installed on the pipe of the air inlet pipe, and the top of the first support rod is fixedly connected to the timer.

[0017] According to the above technical solution, a first program-controlled valve is fixedly installed on the pipe of the first air outlet pipe.

[0018] According to the above technical solution, a second program-controlled valve is fixedly installed on the pipeline of the fourth air outlet pipe.

[0019] According to the above technical solution, a third program-controlled valve is fixedly installed on the pipeline of the third air outlet pipe.

[0020] According to the above technical solution, a second support rod is fixedly installed on the pipe of the connecting pipe, and the top of the second support rod is fixedly connected to the gas chromatograph.

[0021] According to the above technical solution, a fourth programmable valve is fixedly installed on the pipe of the cold air pipe, a fifth programmable valve is fixedly installed on the pipe of the return pipe, and a sixth programmable valve is provided on the right side of the return pipe. The sixth programmable valve is fixedly installed on the pipe of the connecting pipe.

[0022] According to the above technical solution, a seventh program-controlled valve is fixedly installed on the pipeline of the third air outlet pipe.

[0023] According to the above technical solution, the method for using the device for purifying hydrogen from mixed gas comprises the following steps:

[0024] S1. Degassing: Start the first air pump to pump the mixed gas into the raw gas buffer tank, and start the timer to calculate the time of mixed gas pumping;

[0025] S2, mixed gas impurity removal: start the first program-controlled valve and the first adsorption tower to separate the hydrogen from the mixed gas and extract the impurities in the mixed gas;

[0026] S3, extracting hydrogen: starting the second program-controlled valve to extract hydrogen into the hydrogen storage reaction tank through the second outlet pipe;

[0027] S4. Hydrogen purification: Start the third program-controlled valve, test the purity of the hydrogen using a gas chromatograph, and perform a primary purification of the hydrogen inside the hydrogen storage reactor through the second adsorption tower to remove harmful substances in the hydrogen. Perform a secondary purification on the low-purity hydrogen to ensure that the purity of the purified hydrogen meets the gas standard for hydrogen-powered vehicles.

[0028] Specifically, when hydrogen is contained in the hydrogen storage reaction tank, a gas chromatograph is started to detect the purity of the hydrogen, and the purity level of the hydrogen is set to four levels. The purity level of the hydrogen is divided into level 4, level 3, level 2 and level 1 from high to low according to the hydrogen purity content detected by the gas chromatograph, and hydrogen of different purity levels is purified in different ways. When the gas chromatograph detects that the hydrogen purity content is greater than 99.9%, the hydrogen purity level is set to level 4; when the gas chromatograph detects that the hydrogen purity content is less than or equal to 99.9% and greater than 99.7%, the hydrogen purity level is set to level 3; when the gas chromatograph detects that the hydrogen purity content is less than or equal to 99.7% and greater than 99.5%, the hydrogen purity level is set to level 2; when the gas chromatograph detects that the hydrogen purity content is less than or equal to 99.5%, the hydrogen purity level is set to level 1;

[0029] When the gas chromatograph detects that the purity level of the hydrogen is level 4, indicating that the hydrogen is high-purity hydrogen, the second air pump and the sixth program-controlled valve are started, and the high-purity hydrogen flows directly into the membrane separation reaction tank through the connecting pipe to proceed to the next step;

[0030] When the gas chromatograph detects that the purity level of the hydrogen is level 3, the third program-controlled valve is activated, and the hydrogen inside the hydrogen storage reactor flows into the second adsorption tower through the third outlet pipe to purify the hydrogen. The purified hydrogen then flows directly into the membrane separation reactor through the connecting pipe for the next step.

[0031] When the gas chromatograph detects that the purity level of the hydrogen is level 2, the fourth programmable valve and the cold box are activated to adsorb impurities from the hydrogen inside the connecting pipe at low temperature. The adsorbed hydrogen flows directly into the membrane separation reaction tank through the connecting pipe for the next step.

[0032] When the gas chromatograph detects that the purity level of the hydrogen is level 1, the third program-controlled valve is started at this time, and the hydrogen inside the hydrogen storage reaction tank flows into the second adsorption tower through the third outlet pipe. The second adsorption tower contains a certain amount of activated carbon, and the activated carbon adsorbs and removes harmful substances in the hydrogen, thereby performing a primary purification of the hydrogen. The purified hydrogen flows back to the hydrogen storage reaction tank through the third outlet pipe, and the third program-controlled valve is closed. At this time, the fourth program-controlled valve and the cold box are started to perform a secondary purification on the hydrogen inside the connecting pipe. After improving the purity of the extracted hydrogen, the secondary purified hydrogen flows directly into the membrane separation reaction tank through the connecting pipe to proceed to the next step;

[0033] S5. Storing hydrogen: Start the seventh program-controlled valve to transport high-purity hydrogen to the hydrogen storage tank through the third outlet pipe to store the high-purity hydrogen.

[0034] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a first adsorption tower, can separate hydrogen from the mixed gas and extract a certain amount of hydrogen. The extracted hydrogen flows into the interior of the hydrogen storage reaction tank by starting the second programmable valve, and the purity of the hydrogen inside the hydrogen storage reaction tank is detected by a gas chromatograph. According to the different purities of the detected hydrogen, the hydrogen is purified in different ways, low-purity hydrogen is purified twice, and high-purity hydrogen is directly transported to improve the purity of the hydrogen, so that the purity of the purified hydrogen meets the gas standard for hydrogen-powered vehicles, avoiding contact between hydrogen and air, which affects the purity of the extracted hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 It is a schematic diagram of the overall front structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the enlarged structure of area A of the present invention;

[0038] Figure 3 It is a schematic diagram of the overall back structure of the present invention;

[0039] In the figure: 1. Raw gas buffer tank; 2. First air pump; 3. Air inlet pipe; 4. First support rod; 5. Timer; 6. First air outlet pipe; 7. First program-controlled valve; 8. First adsorption tower; 81. Expansion valve; 82. Color sensor; 83. Second air outlet pipe; 84. Solenoid valve; 85. Evaporator; 9. Fourth air outlet pipe; 10. Second program-controlled valve; 11. Hydrogen storage reactor; 12. Second air pump; 13. Third air outlet pipe; 14. Third program-controlled valve; 15. Second adsorption tower; 16. Connecting pipe; 17. Second support rod; 18. Gas chromatograph; 19. Cold air pipe; 20. Fourth program-controlled valve; 21. Cold box; 22. Reflux pipe; 23. Fifth program-controlled valve; 24. Sixth program-controlled valve; 25. Membrane separation reactor; 26. Fifth air outlet pipe; 27. Seventh program-controlled valve; 28. Hydrogen storage tank. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figure 1-3 , the present invention provides a technical solution: a device for purifying hydrogen from a mixed gas, comprising a raw gas buffer tank 1, the raw gas buffer tank 1 is used to store the mixed gas;

[0042] A first air pump 2 is fixedly installed on the top of the raw gas buffer tank 1. The first air pump 2 realizes pressure changes by opening and closing the air valve, the air inlet valve and the air outlet valve, thereby realizing gas compression and pushing. The first air pump 2 is externally connected to a power supply, and the power supply starts the first air pump 2 to pump air. An air inlet pipe 3 is fixedly connected to the top of the first air pump 2. The air inlet pipe 3 is used to transport the mixed gas. A first support rod 4 is fixedly installed on the pipeline of the air inlet pipe 3. A timer 5 is fixedly connected to the top of the first support rod 4. The timer 5 is used to detect the time when the mixed gas flows in.

[0043] A first gas outlet pipe 6 is fixedly connected to the tank body of the raw gas buffer tank 1, and a first program-controlled valve 7 is fixedly installed on the pipe of the first gas outlet pipe 6. The first program-controlled valve 7 is based on the action of the pneumatic actuator and controls the movement of the valve core according to the gas control signal, thereby achieving the purpose of flow regulation or cutting off the medium. The first program-controlled valve 7 is externally connected to a power supply, and the power supply starts the first program-controlled valve 7 to control the flow of gas inside the first gas outlet pipe 6. The other end of the first gas outlet pipe 6 is fixedly connected to a first adsorption tower 8. The first adsorption tower 8 contains a liquid adsorbent, and the liquid adsorbent is liquid nitrogen or liquid oxygen. The first adsorption tower 8 uses the characteristic that the solubility of hydrogen under specific conditions is different from that of other gases to separate hydrogen from the mixed gas. An expansion valve 81 is provided inside the first adsorption tower 8, and the expansion valve 81 uses The expansion and compression characteristics of the fluid are used to control the flow of the fluid, thereby achieving the regulation of the system pressure and temperature. The expansion valve 81 is used to cool the inside of the first adsorption tower 8. The top of the expansion valve 81 is fixedly connected to the evaporator 85, and the evaporator 85 absorbs heat. The expansion valve 81 and the evaporator 85 regenerate the liquid nitrogen. The interior of the first adsorption tower 8 is also provided with a color sensor 82. The color sensor 82 identifies the color of the object by sensing the color of light. The color sensor 82 is used to identify the color of liquid nitrogen. The outside of the first adsorption tower 8 is fixedly connected to the second outlet pipe 83, and the pipe of the second outlet pipe 83 is fixedly installed with a solenoid valve 84. The solenoid valve 84 is externally connected to a power supply. The power supply starts the solenoid valve 84 to control the circulation of the gas inside the second outlet pipe 83.

[0044] A fourth gas outlet pipe 9 is fixedly connected to the side of the tank body of the raw gas buffer tank 1, and a second programmable valve 10 is fixedly installed on the pipe of the fourth gas outlet pipe 9. The second programmable valve 10 is used to control the circulation of gas inside the fourth gas outlet pipe 9. The other end of the fourth gas outlet pipe 9 is fixedly connected to a hydrogen storage reaction tank 11. The hydrogen storage reaction tank 11 is used to store hydrogen separated from the mixed gas. A third gas outlet pipe 13 is fixedly connected to the tank body of the hydrogen storage reaction tank 11. A third programmable valve 14 is fixedly installed on the pipe of the third gas outlet pipe 13. The third programmable valve 14 is used to control the gas circulation inside the pipe of the third gas outlet pipe 13. The other end of the third gas outlet pipe 13 is fixedly connected to a second adsorption tower 15. The interior of the second adsorption tower 15 contains activated carbon. The second adsorption tower 15 removes or purifies harmful substances in hydrogen through the selective adsorption effect of activated carbon.

[0045] A connecting pipe 16 is fixedly connected to the top of the hydrogen storage reaction tank 11, and a second support rod 17 is fixedly installed on the pipe of the connecting pipe 16. A gas chromatograph 18 is fixedly connected to the top of the second support rod 17. The gas chromatograph 18 uses the different distribution coefficients of each component in the sample between the gas phase and the fixed liquid phase to analyze the complex mixture in the gas. The gas chromatograph 18 is used to detect the purity of hydrogen.

[0046] The connecting pipe 16 is also fixedly connected to a cold air pipe 19, which is located on the right side of the second support rod 17. A fourth programmable valve 20 is fixedly installed on the cold air pipe 19. The fourth programmable valve 20 is used to control the circulation of gas on the inner wall of the cold air pipe 19. The other end of the cold air pipe 19 is fixedly connected to a cold box 21. The cold box 21 absorbs and releases heat through the circulating refrigerant, and transports cold air to the inside of the cold box, thereby achieving a cooling effect. The cold box 21 is externally connected to a power supply, and the power supply starts to control the cold box 21 to perform low-temperature adsorption of hydrogen. The connecting pipe 16 is also fixedly connected to a return pipe 22, which is located in a symmetrical area of ​​the cold air pipe 19. A fifth programmable valve 23 is fixedly installed on the return pipe 22. The other end of the return pipe 22 is connected to the second adsorption tower 15. The fifth programmable valve 23 is used to control the circulation of gas inside the return pipe 22. The return pipe 22 is used for secondary extraction of impurities in the hydrogen.

[0047] A sixth programmable valve 24 is provided on the right side of the reflux pipe 22. The sixth programmable valve 24 is fixedly installed on the pipeline of the connecting pipe 16. The sixth programmable valve 24 is used to control the circulation of gas inside the connecting pipe 16. The other end of the connecting pipe 16 is fixedly connected to the second air pump 12. The bottom of the second air pump 12 is fixedly connected to a membrane separation reaction tank 25. The membrane separation reaction tank 25 purifies hydrogen through membrane separation to obtain hydrogen with higher purity. A fifth outlet pipe 26 is fixedly connected to the tank body of the membrane separation reaction tank 25. A seventh programmable valve 27 is fixedly installed on the pipeline of the fifth outlet pipe 26. The seventh programmable valve 27 is used to control the gas circulation inside the fifth outlet pipe 26. The other end of the fifth outlet pipe 26 is fixedly connected to a hydrogen storage tank 28. The hydrogen storage tank 28 is used to store high-purity hydrogen.

[0048] In this embodiment, a method for using a mixed gas to purify hydrogen device is as follows:

[0049] S1, deflation: start the first air pump 2 to pump the mixed gas into the raw gas buffer tank 1, and start the timer 5 to calculate the time of mixed gas pumping;

[0050] The extraction power of the first air pump 2 is set to P. When the mixed gas enters the gas inlet pipe 3, the timer 5 starts timing. The gas inlet pipe 3 delivers the mixed gas to the raw gas buffer tank 1. A certain amount of liquid adsorbent is placed inside the first adsorption tower 8. Since the amount of gas adsorbed by the liquid adsorbent is limited, the delivery rate of the mixed gas needs to be controlled according to the amount of liquid adsorbent inside the first adsorption tower 8.

[0051] When the amount of liquid adsorbent inside the first adsorption tower 8 corresponds to the amount of gas adsorbed is W, the time for the mixed gas to enter the gas inlet pipe 3 is W / P. When the timer 5 detects that the gas inlet time of the mixed gas is W / P, it stops the first air pump 2 to match the gas amount inside the raw gas buffer tank 1 with the adsorbent amount inside the first adsorption tower 8, ensuring that the liquid adsorbent inside the first adsorption tower 8 can sufficiently separate hydrogen from the mixed gas.

[0052] S2, impurity removal of mixed gas: start the first program-controlled valve 7 and the first adsorption tower 8 to separate the hydrogen from the mixed gas and extract the impurities in the mixed gas;

[0053] After the liquid adsorbent separates the hydrogen from the mixed gas, its color changes from blue to light. At this time, the color sensor 82 is activated to detect the color of the liquid adsorbent. When the color of the adsorbent becomes colorless, it indicates that all the hydrogen in the mixed gas has been separated. At this time, the amount of adsorbent matches the amount of the mixed gas, and the adsorbent effect is optimal. The solenoid valve 84 is activated to transport the hydrogen through the second outlet pipe 83 to the inside of the raw gas buffer tank 1 for the next step.

[0054] When the color sensor 82 detects that the color of the adsorbent is light blue, it indicates that the adsorbent can still continue to adsorb. At this time, the first air pump 2 is started to continuously deliver the mixed gas to the inside of the raw gas buffer tank 1.

[0055] S3, extracting hydrogen: starting the second program-controlled valve 10 to extract hydrogen through the fourth outlet pipe 9 into the hydrogen storage reaction tank 11;

[0056] S4. Hydrogen purification: The third program-controlled valve 14 is activated, the purity of the hydrogen is tested by the gas chromatograph 18, the hydrogen in the hydrogen storage reaction tank 11 is initially purified by the second adsorption tower 15 to remove harmful substances in the hydrogen, and the low-purity hydrogen is secondary purified to ensure that the purity of the purified hydrogen meets the standard for hydrogen-powered vehicle gas.

[0057] When hydrogen is contained in the hydrogen storage reaction tank 11, the gas chromatograph 18 is started to detect the purity of the hydrogen, and the purity level of the hydrogen is set to be divided into four levels. The purity level of the hydrogen is divided into level 4, level 3, level 2 and level 1 from high to low according to the hydrogen purity content detected by the gas chromatograph 18. Hydrogen of different purity levels is purified in different ways. When the gas chromatograph 18 detects that the purity content of the hydrogen is greater than 99.9%, the hydrogen purity level is level 4; when the gas chromatograph 18 detects that the purity content of the hydrogen is less than or equal to 99.9% and greater than 99.7%, the hydrogen purity level is level 3; when the gas chromatograph 18 detects that the purity content of the hydrogen is less than or equal to 99.7% and greater than 99.5%, the hydrogen purity level is level 2; when the gas chromatograph 18 detects that the purity content of the hydrogen is less than or equal to 99.5%, the hydrogen purity level is level 1;

[0058] When the gas chromatograph 18 detects that the purity level of the hydrogen is level 4, indicating that the hydrogen is high-purity hydrogen, the second air pump 12 and the sixth programmable valve 24 are started, and the high-purity hydrogen flows directly into the membrane separation reaction tank 25 through the connecting pipe 16 to proceed to the next step;

[0059] When the gas chromatograph 18 detects that the purity level of the hydrogen is level 3, the third program-controlled valve 14 is activated, and the hydrogen inside the hydrogen storage reaction tank 11 flows into the second adsorption tower 15 through the third outlet pipe 13 to purify the hydrogen. Then, the fifth program-controlled valve 23, the sixth program-controlled valve 24, and the second air pump 12 are activated to allow the purified hydrogen to flow directly into the membrane separation reaction tank 25 through the connecting pipe 16 for the next step.

[0060] When the gas chromatograph 18 detects that the purity level of the hydrogen is level 2, the fourth programmable valve 20 and the cold box 21 are activated to adsorb impurities from the hydrogen in the connecting pipe 16 at low temperature. The adsorbed hydrogen flows directly into the membrane separation reaction tank 25 through the connecting pipe 16 for the next step.

[0061] When the gas chromatograph 18 detects that the purity level of the hydrogen is level 1, the third programmable valve 14 is started at this time, and the hydrogen inside the hydrogen storage reaction tank 11 flows into the second adsorption tower 15 through the third outlet pipe 13. The second adsorption tower 15 contains a certain amount of activated carbon, and the activated carbon adsorbs and removes harmful substances in the hydrogen, thereby performing the initial purification of the hydrogen. The purified hydrogen flows back to the interior of the hydrogen storage reaction tank 11 through the third outlet pipe 13, and the third programmable valve 14 is closed. At this time, the fourth programmable valve 20 and the cold box 21 are started to perform secondary purification on the hydrogen inside the connecting pipe 16. After improving the purity of the extracted hydrogen, the secondary purified hydrogen flows directly into the membrane separation reaction tank 25 through the connecting pipe 16 to proceed to the next step.

[0062] S5. Storing hydrogen: activating the seventh program-controlled valve 27 to transport the high-purity hydrogen to the hydrogen storage tank 28 through the fifth outlet pipe 26 to store the high-purity hydrogen.

[0063] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for purifying hydrogen from mixed gas, characterized in that: include: Raw gas buffer tank (1); A first air pump (2), the first air pump (2) is fixedly mounted on the top of the raw gas buffer tank (1), an air inlet pipe (3) is fixedly connected to the top of the first air pump (2), and a timer (5) is provided on the air inlet pipe (3); a first gas outlet pipe (6), the first gas outlet pipe (6) being fixedly connected to the tank body of the raw gas buffer tank (1); the other end of the first gas outlet pipe (6) being fixedly connected to a first adsorption tower (8); a color sensor (82) being provided inside the first adsorption tower (8); a second gas outlet pipe (83) being fixedly connected to the outside of the first adsorption tower (8); and a solenoid valve (84) being fixedly installed on the pipe of the second gas outlet pipe (83); An expansion valve (81), the expansion valve (81) is arranged inside the first adsorption tower (8), and the top of the expansion valve (81) is fixedly connected to an evaporator (85); a fourth gas outlet pipe (9), the fourth gas outlet pipe (9) being fixedly connected to the side of the tank body of the raw gas buffer tank (1), the other end of the fourth gas outlet pipe (9) being fixedly connected to the hydrogen storage reaction tank (11), the tank body of the hydrogen storage reaction tank (11) being fixedly connected to the third gas outlet pipe (13), the other end of the third gas outlet pipe (13) being fixedly connected to the second adsorption tower (15); A connecting pipe (16), the connecting pipe (16) is arranged above the hydrogen storage reaction tank (11), a gas chromatograph (18) is provided on the pipeline of the connecting pipe (16), and the other end of the connecting pipe (16) is fixedly connected to a second gas pump (12); A cold air pipe (19), wherein the cold air pipe (19) is fixedly connected to the pipe of the connecting pipe (16), and the other end of the cold air pipe (19) is fixedly connected to a cold box (21); A reflux pipe (22), wherein the reflux pipe (22) is fixedly connected to the pipe of the connecting pipe (16), and the other end of the reflux pipe (22) is connected to the second adsorption tower (15); A membrane separation reaction tank (25), wherein the membrane separation reaction tank (25) is fixedly connected to the bottom of the second air pump (12), a fifth air outlet pipe (26) is fixedly connected to the tank body of the membrane separation reaction tank (25), and the other end of the fifth air outlet pipe (26) is fixedly connected to a hydrogen storage tank (28); The first adsorption tower (8) contains a liquid adsorbent, which is liquid nitrogen or liquid oxygen, and the second adsorption tower (15) contains activated carbon; A first program-controlled valve (7) is fixedly mounted on the first air outlet pipe (6); A second program-controlled valve (10) is fixedly installed on the fourth air outlet pipe (9); A third program-controlled valve (14) is fixedly installed on the third air outlet pipe (13); A fourth program-controlled valve (20) is fixedly installed on the cold air pipe (19), a fifth program-controlled valve (23) is fixedly installed on the return pipe (22), a sixth program-controlled valve (24) is provided on the right side of the return pipe (22), and the sixth program-controlled valve (24) is fixedly installed on the pipe of the connecting pipe (16); A seventh program-controlled valve (27) is fixedly mounted on the fifth air outlet pipe (26).

2. The device for purifying hydrogen from mixed gas according to claim 1, characterized in that: A first support rod (4) is fixedly mounted on the air inlet pipe (3), and a timer (5) is fixedly connected to the top of the first support rod (4).

3. The device for purifying hydrogen from mixed gas according to claim 2, characterized in that: A second support rod (17) is fixedly mounted on the connecting pipe (16), and the top of the second support rod (17) is fixedly connected to a gas chromatograph (18).

4. The method for using the device for purifying hydrogen from mixed gas according to claim 3, characterized in that: The following steps are involved: S1. Degassing: Start the first air pump (2) to pump the mixed gas into the raw gas buffer tank (1), and simultaneously start the timer (5) to calculate the time for the mixed gas to be pumped in; S2, impurity removal from the mixed gas: start the first program-controlled valve (7) and the first adsorption tower (8) to separate the hydrogen from the mixed gas and extract the impurities in the mixed gas; S3, extracting hydrogen: starting the second program-controlled valve (10) to extract hydrogen into the hydrogen storage reaction tank (11) through the fourth outlet pipe (9); S4, hydrogen purification: start the third program-controlled valve (14), detect the purity of the hydrogen through the gas chromatograph (18), and perform primary purification of the hydrogen inside the hydrogen storage reaction tank (11) through the second adsorption tower (15) to remove harmful substances in the hydrogen, and perform secondary purification on the low-purity hydrogen so that the concentration of the purified hydrogen reaches the standard for hydrogen vehicle gas; Specifically, when hydrogen is contained in the hydrogen storage reaction tank (11), the gas chromatograph (18) is started to detect the purity of the hydrogen, and the purity level of the hydrogen is set to be divided into four levels. The purity level of the hydrogen is divided into level 4, level 3, level 2 and level 1 from high to low according to the purity content of the hydrogen detected by the gas chromatograph (18), and hydrogen of different purity levels is purified in different ways. When the gas chromatograph (18) detects that the purity content of the hydrogen is greater than 99. When the hydrogen purity detected by the gas chromatograph (18) is less than or equal to 99.9% and greater than 99.7%, the hydrogen purity level is level 4; when the hydrogen purity detected by the gas chromatograph (18) is less than or equal to 99.7% and greater than 99.5%, the hydrogen purity level is level 2; when the hydrogen purity detected by the gas chromatograph (18) is less than or equal to 99.5%, the hydrogen purity level is level 1; When the gas chromatograph (18) detects that the purity level of the hydrogen is level 4, it indicates that the hydrogen at this time is high-purity hydrogen. At this time, the second air pump (12) and the sixth program-controlled valve (24) are started, and the high-purity hydrogen flows directly into the membrane separation reaction tank (25) through the connecting pipe (16) to proceed to the next step; When the gas chromatograph (18) detects that the purity level of the hydrogen is level 3, the third program-controlled valve (14) is started, and the hydrogen in the hydrogen storage reaction tank (11) flows into the second adsorption tower (15) through the third outlet pipe (13) to purify the hydrogen. Then, the fifth program-controlled valve (23) is started to allow the purified hydrogen to flow directly into the membrane separation reaction tank (25) through the connecting pipe (16) to proceed to the next step. When the gas chromatograph (18) detects that the purity level of the hydrogen is level 2, the fourth program-controlled valve (20) and the cold box (21) are started to adsorb impurities at low temperature on the hydrogen inside the connecting pipe (16), and the adsorbed hydrogen flows directly into the membrane separation reaction tank (25) through the connecting pipe (16) to proceed to the next step; When the gas chromatograph (18) detects that the purity level of the hydrogen is level 1, the third program-controlled valve (14) is started, and the hydrogen in the hydrogen storage reaction tank (11) flows into the second adsorption tower (15) through the third outlet pipe (13). The second adsorption tower (15) contains a certain amount of activated carbon, and the activated carbon adsorbs and removes harmful substances in the hydrogen, thereby performing a primary purification of the hydrogen. The purified hydrogen flows back to the hydrogen storage reaction tank (11) through the third outlet pipe (13), and the third program-controlled valve (14) is closed. At this time, the fourth program-controlled valve (20) and the cold box (21) are started to perform a secondary purification on the hydrogen in the connecting pipe (16). After improving the purity of the extracted hydrogen, the secondary purified hydrogen flows directly into the membrane separation reaction tank (25) through the connecting pipe (16) to proceed to the next step; S5. Storing hydrogen: Activate the seventh program-controlled valve (27) to transport the high-purity hydrogen through the fifth outlet pipe (26) to the hydrogen storage tank (28) for storage.

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