Hydrogen purification system based on magnesium-based hydride

Abstract

The utility model relates to a hydrogen purification system based on magnesium-based hydride, which comprises a buffer tank, a gas inlet of the buffer tank is connected with a discharge end of a hydrogen purification module through a first gas path header pipe, and a vacuum pump is mounted on the first gas path header pipe in a matched manner. An exhaust port of the buffer tank is connected with a feeding end of the hydrogen purification module through a second gas path header pipe, a metal hydrogen storage material is arranged in the hydrogen purification module, and a feeding port of the buffer tank is connected with an exhaust port of the feed gas storage device through a third gas path header pipe. By arranging the hydrogen purification module, hydrogen components in raw material gas can be absorbed based on magnesium hydride, and compared with some traditional physical and chemical purification schemes, the production cost is low; meanwhile, the number of hydrogen storage tanks in the hydrogen purification module can be reasonably set according to purification requirements, the use flexibility is good, the purity of obtained hydrogen is high, no other impurity gas is mixed in the purification process, and the working efficiency of the system is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen purification technical field especially a hydrogen purification system based on magnesium base hydride. BACKGROUND

[0002] With the development of semiconductor industry, fine chemical industry and optoelectronic high-tech fields, there is a surge in demand for high-purity hydrogen, which promotes the continuous progress of hydrogen purification technology. Hydrogen purification technology aims to effectively remove impurities in hydrogen through physical or chemical methods, and its characteristics are that it can produce high-purity hydrogen that meets the needs of high-end industrial applications.

[0003] In related technologies, the purification of hydrogen mainly depends on two categories of physical and chemical methods. Physical methods include low-temperature distillation, adsorption method and membrane separation. Low-temperature distillation utilizes the large difference in boiling point between hydrogen and other gases, separates high-boiling-point components through condensation, and realizes the purification of hydrogen. It is suitable for recovering raw gas with hydrogen content of 30% to 80%, and the hydrogen purity can reach 90% to 98%. The adsorption method utilizes the physical adsorption of specific adsorbents on gas molecules, and through selective adsorption of impurity components, low-boiling-point hydrogen is separated, such as pressure swing adsorption (PSA) technology. Membrane separation technology utilizes the selective permeability of hollow fiber membranes, and uses the pressure difference on both sides of the membrane as the driving force to realize the recovery and purification of hydrogen, and is widely used in the recovery of hydrogen in synthetic ammonia purge gas, methanol plant vent gas and petroleum refining tail gas.

[0004] However, in the above-mentioned traditional technology, although it can meet the demand for high-purity hydrogen in industry to a certain extent, there are still the following problems:

[0005] On the one hand, some methods such as low-temperature distillation and membrane separation are limited by the composition and conditions of the raw gas in the treatment process, resulting in limited purification efficiency and purity improvement;

[0006] On the other hand, although chemical methods such as catalytic deoxidation can effectively remove impurities such as oxygen in hydrogen, they mostly use noble metals as catalysts, and the purification cost is relatively high, which limits their wide application. INVENTION CONTENTS

[0007] Therefore, it is necessary to provide a hydrogen purification system based on magnesium hydride to solve the problems of high cost and low purity of hydrogen purification.

[0008] The technical scheme adopted by the utility model is as follows:

[0009] A hydrogen purification system based on magnesium-based hydride, comprising a buffer tank, the gas inlet of the buffer tank is connected with the discharge end of the hydrogen purification module through the first gas pipeline, the first gas pipeline is matched with the vacuum pump, the gas outlet of the buffer tank is connected with the feeding end of the hydrogen purification module through the second gas pipeline, the hydrogen purification module is internally provided with a metal hydrogen storage material, the feeding port of the buffer tank is connected with the gas outlet of the raw gas storage device through the third gas pipeline;

[0010] The raw gas in the raw gas storage device enters the buffer tank through the third gas pipeline, the raw gas in the buffer tank enters the internal of the hydrogen purification module through the second gas pipeline, the hydrogen component in the raw gas is absorbed by the metal hydrogen storage material to purify the raw gas, and the waste gas after purification enters the buffer tank through the first gas pipeline under the action of the vacuum pump.

[0011] As a further improvement of the above technical solution:

[0012] The hydrogen purification module comprises a plurality of hydrogen storage tanks connected in series, the gas inlet of the first hydrogen storage tank is connected with the first interface of the first three-way valve through the first circulation pipe, the second interface of the first three-way valve is connected with the second gas pipeline, the third interface of the first three-way valve is connected with the gas outlet of the last hydrogen storage tank through the second circulation pipe, the gas outlet of the first hydrogen storage tank is connected with the first interface of the second three-way valve through the third circulation pipe, the second interface of the second three-way valve is connected with the first gas pipeline, and the third interface of the second three-way valve is connected with the gas inlet of the second hydrogen storage tank through the fourth circulation pipe.

[0013] When the hydrogen purification module comprises at least three hydrogen storage tanks, from the second hydrogen storage tank, a fifth circulation pipe is matched and installed between two adjacent hydrogen storage tanks, and a single fifth circulation pipe is used to connect the gas outlet of the corresponding previous hydrogen storage tank and the gas inlet of the corresponding next hydrogen storage tank, so that the series connection between the hydrogen storage tanks is realized.

[0014] A circulation cutoff pipe group is matched and installed between a single fifth circulation pipe and the first gas pipeline, a single circulation cutoff pipe group comprises a first switch valve installed on the first gas pipeline and a second switch valve installed on the corresponding fifth circulation pipe, and a first connecting pipe is matched and installed between the second switch valve and the first switch valve.

[0015] A total discharge pipe group is matched and installed between the first gas pipeline and the second circulation pipe, the total discharge pipe group comprises a third switch valve installed on the first gas pipeline and a fourth switch valve installed on the second circulation pipe, and a second connecting pipe is matched and installed between the third switch valve and the fourth switch valve.

[0016] The structure of a single hydrogen storage tank is as follows: it includes a tank body, in which a metal hydride is placed, and a heating coil is installed on the outer wall of the tank body. The heating coil is energized and heats up, thereby making the internal temperature of the tank body reach the hydrogen absorption temperature or the hydrogen release temperature. The tank body is provided with a first through hole for gas to enter and a second through hole for gas to exit.

[0017] An insulation layer is installed on the outside of each tank, and the insulation layer surrounds the tank.

[0018] The metal hydride is magnesium hydride.

[0019] The waste outlet of the buffer tank is connected to an exhaust branch pipe, and the waste gas in the buffer tank is discharged through the exhaust branch pipe.

[0020] An exhaust gas treatment device is installed on the exhaust branch pipe.

[0021] The beneficial effects of this utility model are as follows:

[0022] This invention features a compact and rational structure, and is easy to operate. By incorporating a hydrogen purification module, it can purify hydrogen by absorbing hydrogen components from the raw material gas using magnesium hydride, yielding hydrogen with a purity of 99.9999%-99.99999%. The magnesium hydride has a long lifespan and slow decay, allowing for over 7000 recycling cycles, significantly reducing production costs. Furthermore, the number of hydrogen storage tanks in the purification module can be rationally set according to purification requirements, offering good flexibility, high hydrogen purity, and no contamination of other impurities during the purification process, resulting in high system efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a schematic diagram of an embodiment of the present invention in its working state.

[0025] Figure 3 This is a schematic diagram of another embodiment of the present invention (the waste gas treatment device is omitted).

[0026] The components include: 1. Hydrogen storage tank; 2. Vacuum pump; 3. Buffer tank; 4. Waste gas treatment device; 5. Raw material gas storage device; 6. First gas main pipe; 7. Second gas main pipe; 8. Third gas main pipe; 9. Exhaust branch pipe; 10. Circulation shut-off pipe assembly; 11. First circulation pipe; 12. Second circulation pipe; 13. Third circulation pipe; 14. Fourth circulation pipe; 15. First three-way valve; 16. Second three-way valve; 17. Fifth circulation pipe; 18. Third switching valve; 19. Fourth switching valve; 20. Second connecting pipe;

[0027] 101, tank body; 102, heating coil; 103, heat preservation layer;

[0028] 1001, first switching valve; 1002, second switching valve; 1003, first connecting pipe. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0030] The structure and function of the present application are as follows:

[0031] As Figures 1-3 A hydrogen purification system based on magnesium hydride, comprising a buffer tank 3, the gas inlet of the buffer tank 3 is connected with the discharge end of the hydrogen purification module through a first gas route main pipe 6, a vacuum pump 2 is installed on the first gas route main pipe 6 in cooperation, the gas outlet of the buffer tank 3 is connected with the feeding end of the hydrogen purification module through a second gas route main pipe 7, a metal hydrogen storage material is arranged inside the hydrogen purification module, the feeding port of the buffer tank 3 is connected with the gas outlet of the raw gas storage device 5 through a third gas route main pipe 8; the raw gas in the raw gas storage device 5 enters the buffer tank 3 through the third gas route main pipe 8, the raw gas in the buffer tank 3 enters the inside of the hydrogen purification module through the second gas route main pipe 7, absorbs the hydrogen component in the raw gas through the metal hydrogen storage material so as to purify the raw gas, and the waste gas after purification enters the buffer tank 3 through the first gas route main pipe 6 under the action of the vacuum pump 2. The hydrogen purification system of the present application comprises a hydrogen purification module, a vacuum pump 2, a buffer tank 3, a raw gas storage device 5, a first gas route main pipe 6, a second gas route main pipe 7 and a third gas route main pipe 8; wherein, the vacuum pump 2 is used for driving the gas flow in the pipeline, the buffer tank 3 is used for buffering the raw gas and waste gas, and the hydrogen purification module absorbs the hydrogen component in the raw gas based on the metal hydrogen storage material, so as to realize the hydrogen purification. In the present application, the raw gas is low-purity hydrogen, and after being purified by the hydrogen purification system, hydrogen with a purity of 99.9999%-99.99999% can be obtained.

[0032] The metal hydride is magnesium hydride, which has large hydrogen storage capacity, rich resources, low cost and good safety.

[0033] The hydrogen purification module includes several hydrogen storage tanks 1 connected in series. The inlet of the first hydrogen storage tank 1 is connected to the first interface of the first three-way valve 15 via the first circulation pipe 11. The second interface of the first three-way valve 15 is connected to the second gas main pipe 7. The third interface of the first three-way valve 15 is connected to the exhaust port of the last hydrogen storage tank 1 via the second circulation pipe 12. The exhaust port of the first hydrogen storage tank 1 is connected to the first interface of the second three-way valve 16 via the third circulation pipe 13. The second interface of the second three-way valve 16 is connected to the first gas main pipe 6. The third interface of the second three-way valve 16 is connected to the inlet of the second hydrogen storage tank 1 via the fourth circulation pipe 14. The hydrogen purification module includes hydrogen storage tanks 1, first circulation pipe 11, second circulation pipe 12, third circulation pipe 13, fourth circulation pipe 14, first three-way valve 15, and second three-way valve 16. By arranging multiple hydrogen storage tanks 1, the raw material gas can circulate between two hydrogen storage tanks 1 during hydrogen purification, thereby improving the raw material utilization rate.

[0034] The second port of the first three-way valve 15 corresponds to the feed end of the hydrogen purification module, and the second port of the second three-way valve 16 corresponds to the discharge end of the hydrogen purification module.

[0035] The hydrogen purification module is equipped with at least two hydrogen storage tanks 1, such as Figures 1-2 As shown, in one embodiment, two hydrogen storage tanks 1 can be arranged, or, as... Figure 3 As shown, six hydrogen storage tanks can be arranged.

[0036] Specifically, when arranging two hydrogen storage tanks 1, Figure 1 , Figure 2 The two hydrogen storage tanks 1 in the diagram are defined as hydrogen storage tank A and hydrogen storage tank B from left to right. Hydrogen storage tank A corresponds to the first hydrogen storage tank 1, and hydrogen storage tank B corresponds to the last hydrogen storage tank 1, which is also the second hydrogen storage tank 1. At this time, the gas inlet of hydrogen storage tank A is connected to the first interface of the first three-way valve 15 through the first circulation pipe 11, and the gas outlet of hydrogen storage tank A is connected to the first interface of the second three-way valve 16 through the third circulation pipe 13. The gas inlet of hydrogen storage tank B is connected to the third interface of the second three-way valve 16 through the fourth circulation pipe 14, and the gas outlet of hydrogen storage tank B is connected to the third interface of the first three-way valve 15 through the second circulation pipe 12.

[0037] The hydrogen purification module operates as follows:

[0038] First, the first port of the first three-way valve 15 is connected to the second port of the first three-way valve 15, and the second three-way valve 16 is closed (i.e., its first port is not connected to the other two ports). The raw material gas in the buffer tank 3 enters the hydrogen storage tank A through the second gas main pipe 7 and the first circulation pipe 11.

[0039] When the raw material gas in the buffer tank 3 is exhausted, the first interface of the first three-way valve 15 is communicated with the third interface of the first three-way valve 15, and the first interface of the second three-way valve 16 is communicated with the third interface of the second three-way valve 16, at this time, the raw material gas circulates between the hydrogen storage tank A and the hydrogen storage tank B through the first circulating pipe 11, the third circulating pipe 13, the fourth circulating pipe 14 and the second circulating pipe 12;

[0040] At the same time, under certain temperature and pressure conditions, the raw material gas in the hydrogen storage tank A and the hydrogen storage tank B respectively reacts with the magnesium hydride therein, so that the hydrogen component in the raw material gas is purified by the magnesium hydride;

[0041] After multiple cycles of purification, the first three-way valve 15 is closed, and the first interface of the second three-way valve 16 is communicated with the second interface of the second three-way valve 16, so that the waste gas remaining after the purification of the raw material gas flows back into the buffer tank 3 through the third circulating pipe 13 and the second gas line main pipe 6.

[0042] When more than two hydrogen storage tanks 1 are arranged, Figure 3 The six hydrogen storage tanks 1 in the hydrogen gas purification module are defined as the hydrogen storage tank C, the hydrogen storage tank D, the hydrogen storage tank E, the hydrogen storage tank F, the hydrogen storage tank G and the hydrogen storage tank H from left to right, wherein the hydrogen storage tank C corresponds to the first hydrogen storage tank 1, the hydrogen storage tank D corresponds to the second hydrogen storage tank 1, and the hydrogen storage tank H corresponds to the last hydrogen storage tank 1; at this time, the gas inlet of the hydrogen storage tank C is connected with the first interface of the first three-way valve 15 through the first circulating pipe 11, and the gas outlet of the hydrogen storage tank C is connected with the first interface of the second three-way valve 16 through the third circulating pipe 13; the gas inlet of the hydrogen storage tank D is connected with the third interface of the second three-way valve 16 through the fourth circulating pipe 14, and the gas outlet of the hydrogen storage tank H is connected with the third interface of the first three-way valve 15 through the second circulating pipe 12;

[0043] When the hydrogen gas purification module includes at least three hydrogen storage tanks 1, starting from the second hydrogen storage tank 1, a fifth circulating pipe 17 is installed between two adjacent hydrogen storage tanks 1, and a single fifth circulating pipe 17 is used to connect the gas outlet of the corresponding previous hydrogen storage tank 1 with the gas inlet of the corresponding next hydrogen storage tank 1, so as to realize the series connection between the hydrogen storage tanks 1; that is, the gas outlet of the hydrogen storage tank D is connected with the gas inlet of the hydrogen storage tank E through a fifth circulating pipe group 17, the gas outlet of the hydrogen storage tank E is connected with the gas inlet of the hydrogen storage tank F through another fifth circulating pipe group 17, and so on, until the series connection between the hydrogen storage tank G and the hydrogen storage tank H is completed;

[0044] At this time, the working process of the hydrogen gas purification module is as follows:

[0045] First, the first interface of the first three-way valve 15 is communicated with the second interface of the first three-way valve 15, and the second three-way valve 16 is closed (i.e. its first interface is not communicated with the other two interfaces), the raw material gas in the buffer tank 3 enters the hydrogen storage tank A through the second gas line main pipe 7 and the first circulating pipe 11, until the raw material gas in the buffer tank 3 is exhausted;

[0046] Subsequently, the first interface of the first three-way valve 15 is communicated with the third interface of the first three-way valve 15, and the first interface of the second three-way valve 16 is communicated with the third interface of the second three-way valve 16, at this time, the raw material gas circulates between the hydrogen storage tank C and the hydrogen storage tank H through the first circulating pipe 11, the third circulating pipe 13, the fourth circulating pipe 14, the several fifth circulating pipes 17 and the second circulating pipe 12;

[0047] At the same time, under certain temperature and pressure conditions, the raw material gas in the hydrogen storage tank C and the hydrogen storage tank H respectively reacts with the magnesium hydride therein, so as to purify the hydrogen component in the raw material gas through the magnesium hydride;

[0048] After multiple circulation and purification, the first three-way valve 15 is closed, and the first interface of the second three-way valve 16 is communicated with the second interface of the second three-way valve 16, so that the waste gas remaining after the raw material gas is purified flows back to the buffer tank 3 through the third circulating pipe 13 and the second gas line main pipe 6.

[0049] The single fifth circulating pipe 17 and the first gas line main pipe 6 are cooperatively installed with a circulating cut-off pipe group 10, and the single circulating cut-off pipe group 10 includes a first switch valve 1001 installed on the first gas line main pipe 6, and a second switch valve 1002 installed on the corresponding fifth circulating pipe 17, and the second switch valve 1002 and the first switch valve 1001 are cooperatively installed with a first connecting pipe 1003. The circulating cut-off pipe group 10 can complete the purification circulation at any position of the hydrogen purification module, so that the raw material gas and the waste gas do not have to flow into the first gas line main pipe 6 from the hydrogen storage tank C for discharge, which can save the purification time and improve the system working efficiency.

[0050] The first gas line main pipe 6 and the second circulating pipe 12 are cooperatively installed with a total discharge pipe group, and the total discharge pipe group includes a third switch valve 18 installed on the first gas line main pipe 6, and a fourth switch valve 19 installed on the second circulating pipe 12, and the third switch valve 18 and the fourth switch valve 19 are cooperatively installed with a second connecting pipe 20. By setting the total discharge pipe group, the raw material gas and the waste gas flowing out of the last hydrogen storage tank 1 can flow into the first gas line main pipe 6 for discharge.

[0051] The first switch valve 1001, the second switch valve 1002, the second switch valve 18 and the fourth switch valve 19 can all adopt a three-way valve, and according to the actual production demand, the on-off of the internal passage is controlled, so as to change the flow direction of the gas in the system.

[0052] The single hydrogen storage tank 1 comprises a tank body 101, a metal hydride is placed in the tank body 101, a heating coil 102 is cooperatively installed on the outer wall surface of the tank body 101, the heating coil 102 is electrified to generate heat, so that the internal temperature of the tank body 101 reaches the hydrogen absorption temperature or the hydrogen release temperature, and a first through hole for gas entering and a second through hole for gas discharging are respectively formed on the tank body 101. The first through hole can be formed on the bottom wall surface or the top wall surface of the tank body 101, and the second through hole can be formed on the bottom wall surface or the top wall surface of the tank body 101.

[0053] The single tank body 101 is cooperatively installed with a heat preservation layer 103, and the heat preservation layer 103 surrounds the tank body 101. Since the hydrogen absorption and release temperature of magnesium hydride is above 280 DEG C, by arranging the heat preservation layer 103, heat loss of the system can be avoided, and energy consumption is reduced.

[0054] The exhaust port of the buffer tank 3 is connected with an exhaust branch pipe 9, the exhaust gas in the buffer tank 3 is discharged through the exhaust branch pipe 9, and the exhaust branch pipe 9 is cooperatively installed with an exhaust gas treatment device 4. The exhaust gas treatment device 4 is used for cooling treatment of the exhaust gas, so that the exhaust gas is discharged after reaching normal temperature.

[0055] According to specific use requirements and installation requirements, each pipeline in the utility model can adopt the form of being spliced by a plurality of short pipes, or can adopt the form of a long pipe; in addition, a control valve, a pump and the like can be additionally installed on each pipeline, and configuration can be carried out according to actual production requirements.

[0056] The working process of the utility model is as follows:

[0057] The raw material gas in the raw material gas storage device 5 enters the buffer tank 3 through the third gas line main pipe 8, the raw material gas in the buffer tank 3 enters the hydrogen gas purification module through the second gas line main pipe 7, after being purified by magnesium hydride in the hydrogen gas purification module, waste gas is obtained, under the action of the vacuum pump 2, the waste gas enters the buffer tank 3 through the first gas line main pipe 6, and after being cooled by the exhaust gas treatment device 4, is discharged to the atmosphere through the exhaust branch pipe 9.

[0058] The above description is an explanation of the utility model, not a limitation of the utility model, the range defined by the utility model is referred to the claims, and any form of modification can be made within the protection range of the utility model.

Claims

1. A hydrogen purification system based on magnesium hydride, characterized in that: The buffer tank (3) is connected with the discharge end of the hydrogen purification module through the first gas pipeline (6), and the vacuum pump (2) is installed on the first gas pipeline (6); the exhaust port of the buffer tank (3) is connected with the feed end of the hydrogen purification module through the second gas pipeline (7), and the metal hydrogen storage material is arranged in the hydrogen purification module; the feed port of the buffer tank (3) is connected with the exhaust port of the raw gas storage device (5) through the third gas pipeline (8); The raw gas in the raw gas storage device (5) enters the buffer tank (3) through the third gas pipeline (8), the raw gas in the buffer tank (3) enters the hydrogen purification module through the second gas pipeline (7), the hydrogen component in the raw gas is absorbed by the metal hydrogen storage material, so that the raw gas is purified, and the waste gas after purification enters the buffer tank (3) through the first gas pipeline (6) under the action of the vacuum pump (2).

2. A hydrogen purification system based on magnesium hydride according to claim 1, characterized in that: The hydrogen purification module comprises a plurality of hydrogen storage tanks (1) connected in series, the gas inlet of the first hydrogen storage tank (1) is connected with the first interface of the first three-way valve (15) through the first circulating pipe (11), the second interface of the first three-way valve (15) is connected with the second gas pipeline (7), the third interface of the first three-way valve (15) is connected with the exhaust port of the last hydrogen storage tank (1) through the second circulating pipe (12), the exhaust port of the first hydrogen storage tank (1) is connected with the first interface of the second three-way valve (16) through the third circulating pipe (13), the second interface of the second three-way valve (16) is connected with the first gas pipeline (6), and the third interface of the second three-way valve (16) is connected with the gas inlet of the second hydrogen storage tank (1) through the fourth circulating pipe (14).

3. A hydrogen purification system based on magnesium hydride according to claim 2, characterized in that: When the hydrogen purification module comprises at least three hydrogen storage tanks (1), starting from the second hydrogen storage tank (1), a fifth circulating pipe (17) is installed between two adjacent hydrogen storage tanks (1), and the fifth circulating pipe (17) is used for connecting the exhaust port of the corresponding previous hydrogen storage tank (1) and the gas inlet of the corresponding next hydrogen storage tank (1), so that the hydrogen storage tanks (1) are connected in series.

4. A hydrogen purification system based on magnesium hydride according to claim 3, characterized in that: A circulating cutoff pipe group (10) is installed between the fifth circulating pipe (17) and the first gas pipeline (6), one circulating cutoff pipe group (10) comprises a first switch valve (1001) installed on the first gas pipeline (6) and a second switch valve (1002) installed on the corresponding fifth circulating pipe (17), and a first connecting pipe (1003) is installed between the second switch valve (1002) and the first switch valve (1001).

5. A hydrogen purification system based on magnesium hydride according to claim 2, characterized in that: A total discharge pipe group is installed between the first gas pipeline (6) and the second circulating pipe (12), the total discharge pipe group comprises a third switch valve (18) installed on the first gas pipeline (6) and a fourth switch valve (19) installed on the second circulating pipe (12), and a second connecting pipe (20) is installed between the third switch valve (18) and the fourth switch valve (19).

6. A hydrogen purification system based on magnesium hydride according to claim 2, characterized in that: The structure of the single hydrogen storage tank (1) comprises a tank body (101) in which a metal hydride is placed, and a heating coil (102) is fitted and installed on the outer wall surface of the tank body (101), the heating coil (102) is electrified to generate heat, so that the internal temperature of the tank body (101) reaches the hydrogen absorption temperature or the hydrogen release temperature, and the tank body (101) is respectively provided with a first through hole for gas entering and a second through hole for gas discharging.

7. A hydrogen purification system based on magnesium hydride according to claim 6, characterized in that: An insulating layer (103) is fitted and installed on the outside of the single tank body (101), and the insulating layer (103) surrounds the tank body (101).

8. A hydrogen purification system based on magnesium hydride according to claim 6, characterized in that: The metal hydride is magnesium hydride.

9. A hydrogen purification system based on magnesium hydride according to claim 1, characterized in that: The exhaust port of the buffer tank (3) is connected with an exhaust branch pipe (9), and the exhaust gas in the buffer tank (3) is discharged through the exhaust branch pipe (9).

10. A hydrogen purification system based on magnesium hydride according to claim 9, characterized in that: An exhaust gas treatment device (4) is fitted and installed on the exhaust branch pipe (9).

Images