Hydrogen preparation system and cyclic preparation process thereof

Abstract

The invention discloses a hydrogen preparation system and a cyclic preparation process thereof. The preparation system comprises a hydrogen reaction device, a hydrogen induced draft fan, a hydrogen heat exchanger, a hydrogen drying section, a hydrogen purification device, a hydrogen compressor and a hydrogen storage tank, the hydrogen reaction device is connected with the hydrogen induced draft fan, the hydrogen induced draft fan is connected with the hydrogen heat exchanger, the hydrogen heat exchanger is connected with the hydrogen drying section, the hydrogen drying section is connected with the hydrogen purification device, the hydrogen purification device is connected with the hydrogen compressor, and the hydrogen compressor is connected with the hydrogen storage tank. The preparation process comprises the following steps: firstly, generating hydrogen on the basis of the system by using active metal and water subjected to impurity removal, and then dehydrating and purifying to obtain pure hydrogen; then acidifying and electrolyzing alkali formed during hydrogen production of the active metal to obtain the active metal again; and then the regenerated active metal returns to the preparation system again, and hydrogen is prepared again. The device has the advantages of simple structure, simple and convenient process, low hydrogen production cost and easiness in popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production, and specifically relates to a hydrogen production system and its cyclic production process. Background Art

[0002] Certain developments have been made in China's research and development in the fields of electrolytic hydrogen production and hydrogen energy fuel cells; since the 21st century, China has also included hydrogen energy in the energy development plan many times, accelerating the promotion in the fields of transportation, military, energy, aviation, etc. to promote the goal of hydrogen energy commercialization.

[0003] Hydrogen belongs to secondary energy, and its main sources include simple hydrogen-containing compounds such as methane (natural gas, coalbed methane, etc.), lower alcohols (methanol, ethanol), ammonia, and water; among them, water has the richest source and is the most convenient to use. The preparation method is mainly electrolysis; electrolytic water hydrogen production seems to be the simplest method. The core of electrolytic water hydrogen production depends on the electrolyzer equipment, and the cost of hydrogen production depends on the electricity cost; thus, it can be seen that there are too many restrictive factors in electrolytic water hydrogen production. At present, the equipment structures used in electrolytic water hydrogen production are relatively complex, and the raw material cost and electricity cost of the used preparation methods are relatively high, which is not conducive to popularization and application. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydrogen production system and its cyclic production process to solve the technical problems existing in the background art.

[0005] To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0006] On the one hand, the present invention provides a hydrogen production system, comprising:

[0007] A hydrogen reaction device, which is used to react the water after impurity removal with an active metal to generate high-temperature hydrogen and the alkali corresponding to the active metal;

[0008] A hydrogen induced draft fan, which is connected to the hydrogen reaction device and is used to extract the high-temperature hydrogen produced by the hydrogen reaction device;

[0009] A hydrogen heat exchanger, which is connected to the hydrogen induced draft fan and is used to receive the high-temperature hydrogen extracted from the hydrogen reaction device by the hydrogen induced draft fan and perform heat exchange treatment on it to make it reach normal temperature and then output normal-temperature hydrogen;

[0010] A hydrogen drying section, which is connected to the hydrogen heat exchanger and is used to receive the normal-temperature hydrogen output from the hydrogen heat exchanger and perform drying and dehydration on it to output normal-temperature dry hydrogen;

[0011] A hydrogen purification device, which is connected to the hydrogen drying section and is used to receive the normal-temperature dry hydrogen output from the hydrogen drying section and perform purification treatment on it to output normal-temperature pure hydrogen;

[0012] A hydrogen compressor, connected to a hydrogen purification device, is used to receive the normal-temperature pure hydrogen output from the hydrogen purification device, and after compressing it, output high-pressure pure hydrogen.

[0013] A hydrogen storage tank, connected to the hydrogen compressor, is used to receive and store the high-pressure pure hydrogen output from the hydrogen compressor.

[0014] Further, the water after impurity removal is the water obtained by heating, cooling, and solid-liquid separation to remove particulate matter and dissolved gases from tap water, seawater, river water, lake water, stream water, rainwater, domestic sewage, or industrial wastewater.

[0015] Further, the active metal is an alkali metal, an alkaline earth metal, a transition metal, or aluminum.

[0016] Further, the hydrogen reaction device is a reaction kettle or a reaction tank.

[0017] Further, the hydrogen drying section includes a first housing and a desiccant disposed inside the first housing, which is composed of a composite of an oxide of an alkali metal, a chloride of an alkali metal, an oxide of an alkaline earth metal, a chloride of an alkaline earth metal, an alkali corresponding to an alkali metal, or an alkali corresponding to an alkaline earth metal and anhydrous copper sulfate.

[0018] Further, the hydrogen purification device includes a second housing and a three-layer composite membrane disposed inside the second housing and supported by polyimide. The three-layer composite membrane is composed of inner and outer layers of PCL plastic and an intermediate layer of metal composite. The metal composite is composed of palladium metal and perovskite nanospheres. Both the inner and outer layers of PCL plastic and the intermediate layer of metal composite are supported by polyimide.

[0019] On the other hand, the present invention provides a hydrogen circulation preparation process, which includes the following steps:

[0020] S1. Prepare water after impurity removal: Heat the raw water to 20 - 90 °C to discharge the dissolved gas therein, and then successively cool and perform solid-liquid separation to remove particulate matter and dissolved gases to obtain the water after impurity removal; the raw water is tap water, seawater, river water, lake water, stream water, rainwater, domestic sewage, or industrial wastewater; wherein, the water after impurity removal is not pure water and still contains various soluble salts.

[0021] S2, preparing hydrogen: adding the impurity-free water obtained in S1 to the hydrogen reaction device of the hydrogen preparation system, and then adding an appropriate amount of active metal element to the hydrogen reaction device, and utilizing the active metal to react with the impurity-free water to generate hydrogen and the base corresponding to the active metal; wherein, when the active metal encounters the impurity-free water, it will quickly generate hydrogen and release heat; at the same time, the base corresponding to the active metal will also be generated, and the latter will sink to the bottom of the hydrogen reaction device together with other various soluble salts in the impurity-free water and be discharged in time; the heat released during hydrogen production will be discharged along with the hydrogen;

[0022] S3, hydrogen storage: The hydrogen produced by the hydrogen reaction device in S2 is quickly extracted by the induced draft fan of the hydrogen preparation system and transported to the hydrogen heat exchanger. After heat exchange in the hydrogen heat exchanger to reach room temperature, it is successively input into the hydrogen drying section for drying and dehydration, and then into the hydrogen purification device for purification to obtain pure hydrogen. Finally, the obtained pure hydrogen is compressed by a hydrogen compressor and pumped into a hydrogen storage tank for storage;

[0023] S4, preparation of active metal: the alkali corresponding to the active metal produced in the hydrogen reaction device in S2 and other contents in the water after impurities are all sunk to the bottom of the hydrogen reaction device in the form of precipitates and discharged; then the precipitates are ground into powder and added to an acidification reactor containing hydrochloric acid solution, and after acidification reaction and solid-liquid separation, a solid part and a liquid part are obtained; then the liquid part is successively evaporated, concentrated, and dried, and then added to an electrolytic cell, and electrolysis is started after melting in the electrolytic cell; during the electrolysis process, the negative electrode collects the metal mixture, and the positive electrode collects chlorine; then the metal mixture collected by the negative electrode is placed in a melting furnace, first subjected to successive heating treatments, and then subjected to successive condensation treatments to obtain different metal elements; wherein the metal mixture collected at the negative electrode contains the active metal added in S2 and other metal elements precipitated from other contents by electrolysis;

[0024] The melting furnace is mainly composed of a furnace, a grate, and a molten liquid collecting pipe; the furnace wall is provided with an electromagnetic heating grid, which is a high-efficiency and low-consumption heat source; the molten liquid flows down from the grate to the molten liquid collecting pipe, and corresponding special collecting pipes and condensing devices are provided for different metal molten liquids, so as to ensure the purity of each metal element; the temperature in the melting furnace is gradually increased, and the molten liquids of different metals are collected respectively, and the elements of different metals are obtained by condensation, and the metals obtained in sequence are potassium (melting point 63°C), sodium (melting point 98°C), lithium (melting point 180°C), magnesium (melting point 651°C), calcium (melting point 815°C), etc.;

[0025] S5. Hydrogen production in a cycle: Put the active metal obtained in S4 into the hydrogen reaction device in S2 to react with the purified water to produce hydrogen again. Then repeat S3. Again, dry, dehydrate, purify, and compress the produced hydrogen and store it in the hydrogen storage tank. Subsequently, repeat S4 to produce the active metal again, and then put the produced active metal into the hydrogen reaction device to produce hydrogen again. By repeating this process continuously, the cyclic production of hydrogen can be achieved.

[0026] Further, in S4, the concentration of the hydrochloric acid solution is 10% - 60%.

[0027] Further, in S4, the electric power required for electrolysis in the electrolytic cell is green electricity, and the green electricity comes from wind power generation, photovoltaic power generation, or hydropower generation.

[0028] Compared with the prior art, the advantages of the present invention are as follows: simple structure, simple preparation process, rich and easily available raw materials, low production cost, and easy to promote and apply.

[0029] The hydrogen production process in a cycle provided by the present invention is different from the existing electrolytic hydrogen production and hydrogen evolution methods from hydrogen-containing compounds. On the one hand, the hydrogen production process in a cycle proposed by the present invention belongs to the "chemical hydrogen production technology (CHP)" which is simple and low-energy-consuming; on the other hand, the chemical substances (i.e., active metals) participating in hydrogen production can be regenerated and can be used again in the hydrogen production process, and the raw materials participating in hydrogen production (i.e., purified water) are rich in source and inexpensive; therefore, the cost of hydrogen produced by the preparation method provided by the present invention is very low, and the technology is easier to promote and apply. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments, the following will briefly introduce the drawings required for the description of the embodiments; obviously, the drawings described below are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0031] Figure 1 is a schematic structural diagram of the hydrogen production system provided by the present invention;

[0032] Figure 2 is a process flow diagram of the hydrogen production process in a cycle provided by the present invention;

[0033] Description of the reference numerals: 1. Hydrogen reaction device; 2. Hydrogen induced draft fan; 3. Hydrogen heat exchanger; 4. Hydrogen drying section; 5. Hydrogen purification device; 6. Hydrogen compressor; 7. Hydrogen storage tank. Detailed Embodiments

[0034] To make the technical means, creative features, achieved objectives and effects of the present invention easily understood, the following further elaborates how the present invention is implemented in conjunction with the accompanying drawings and specific embodiments.

[0035] Refer to Figure 1 , the present invention provides a hydrogen production system, which includes the following components:

[0036] A hydrogen reaction device 1, which is used to react the water after impurity removal with active metals to generate high-temperature hydrogen and the alkali corresponding to the active metals;

[0037] A hydrogen induced draft fan 2, which is connected to the hydrogen reaction device 1 and is used to timely extract the high-temperature hydrogen produced by the hydrogen reaction device 1;

[0038] A hydrogen heat exchanger 3, which is connected to the hydrogen induced draft fan 2 and is used to receive the high-temperature hydrogen extracted from the hydrogen reaction device 1 by the hydrogen induced draft fan 2, and perform heat exchange treatment on it. After it reaches room temperature, room-temperature hydrogen is output;

[0039] A hydrogen drying section 4, which is connected to the hydrogen heat exchanger 3 and is used to receive the room-temperature hydrogen output from the hydrogen heat exchanger 3, and after drying and dehydrating it, output room-temperature dry hydrogen;

[0040] A hydrogen purification device 5, which is connected to the hydrogen drying section 4 and is used to receive the room-temperature dry hydrogen output from the hydrogen drying section 4, and after purifying it, output room-temperature pure hydrogen;

[0041] A hydrogen compressor 6, which is connected to the hydrogen purification device 5 and is used to receive the room-temperature pure hydrogen output from the hydrogen purification device 5, and after compressing it, output high-pressure pure hydrogen;

[0042] A hydrogen storage tank 7, which is connected to the hydrogen compressor 6 and is used to receive and store the high-pressure pure hydrogen output from the hydrogen compressor 6.

[0043] Specifically, the water after impurity removal is the water obtained by heating, cooling, solid-liquid separation to remove particulate matter and dissolved gases from tap water, seawater, river water, lake water, stream water, rainwater, domestic sewage or industrial wastewater.

[0044] Specifically, the active metals are alkali metals, alkaline earth metals, transition metals or aluminum; among them, alkali metals refer to all the metal elements in Group IA of the periodic table of elements, including six elements: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr); alkaline earth metals refer to all the metal elements in Group IIA of the periodic table of elements, including six elements: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra); transition metals refer to a series of metal elements in the d-block of the periodic table of elements.

[0045] Specifically, the hydrogen reaction device 1 is a reaction kettle or a reaction tank. More specifically, the reaction kettle or the reaction tank is formed by winding a hybrid fiber composed of 10-90% carbon fiber and 90-10% glass fiber on the outer side of an aluminum alloy inner liner.

[0046] Specifically, the hydrogen heat exchanger 3 has a structure of a U-shaped tube composite heat sink; and both the U-shaped tube and the heat sink are formed by hot pressing a mixture of 10-90% aramid fiber, 90-10% glass fiber, and 0.1-10% graphene.

[0047] Specifically, the hydrogen drying section 4 includes a first housing and a desiccant disposed inside the first housing, which is a composite of an oxide of an alkali metal, a chloride of an alkali metal, an oxide of an alkaline earth metal, a chloride of an alkaline earth metal, an alkali corresponding to an alkali metal or an alkali corresponding to an alkaline earth metal and anhydrous copper sulfate.

[0048] Specifically, the hydrogen purification device 5 includes a second housing and a three-layer composite membrane supported by polyimide disposed inside the second housing; wherein, the three-layer composite membrane is composed of two inner and outer layers of PCL plastics and an intermediate layer of metal composite; wherein the metal composite is composed of metal palladium and perovskite nanospheres, and both the two inner and outer layers of PCL plastics and the intermediate layer of metal composite are supported by polyimide; the two inner and outer layers of PCL plastics only allow small molecule gases to pass through; the intermediate layer of metal composite only allows H 2 to diffuse and pass through.

[0049] Specifically, the hydrogen storage tank 7 is formed by winding a hybrid fiber composed of 10-90% carbon fiber and 90-10% aramid fiber on the outer side of an aluminum alloy inner liner.

[0050] Refer to Figure 2 , the present invention also provides a hydrogen circulation preparation process, which includes the following steps:

[0051] S1. Prepare the water after impurity removal: Heat the raw water to 20-90 °C to discharge the dissolved gas therein, and then sequentially cool and perform solid-liquid separation to remove particulate matter to obtain the water after impurity removal; wherein, the raw water is tap water, seawater, river water, lake water, stream water, rainwater, domestic sewage or industrial wastewater; wherein, the water after impurity removal is not pure water and still contains various soluble salts;

[0052] S2, preparing hydrogen: adding the impurity-free water obtained in S1 to the hydrogen reaction device of the hydrogen preparation system, and then adding an appropriate amount of active metal to the hydrogen reaction device, using the active metal to react with the impurity-free water to generate hydrogen and the base corresponding to the active metal; wherein, when the active metal encounters the impurity-free water, it will quickly generate hydrogen and release heat; at the same time, the base corresponding to the active metal will also be generated, and the latter will sink to the bottom of the hydrogen reaction device together with other various soluble salts in the impurity-free water and be discharged in time; the heat released during hydrogen production will be discharged along with the hydrogen;

[0053] S3, storage of hydrogen: the hydrogen produced by the hydrogen reaction device 1 in S2 is quickly extracted by the induced draft fan 2 of the hydrogen preparation system, and transported to the hydrogen heat exchanger 3, and after heat exchange in the hydrogen heat exchanger 3 to reach room temperature, it is sequentially input into the hydrogen drying section 4 for drying and dehydration, and then into the hydrogen purification device 5 for purification to obtain pure hydrogen, and finally the obtained pure hydrogen is compressed by the hydrogen compressor 6 and pumped into the hydrogen storage tank 7 for storage;

[0054] S4, preparation of active metal: the alkali corresponding to the active metal produced in the hydrogen reaction device 1 in S2 and other contents are all sunk to the bottom of the hydrogen reaction device 1 in the form of precipitates and discharged; then the precipitate is ground into powder and added to an acidification reactor containing hydrochloric acid solution, and after acidification reaction and solid-liquid separation, a solid part and a liquid part are obtained; then the liquid part is successively evaporated, concentrated, and dried, and then added to an electrolytic cell, and electrolysis is started after melting in the electrolytic cell; during the electrolysis process, the negative electrode collects a metal mixture (including sodium, potassium, magnesium, calcium, lithium and the active metal used in hydrogen production in S2), and the positive electrode collects chlorine; then the metal mixture collected by the negative electrode is placed in a melting furnace, first subjected to successive heating treatments, and then subjected to successive condensation treatments to obtain different metal elements (including the active metal used in hydrogen production in S2); wherein the metal mixture collected at the negative electrode includes the active metal added to S2 and other metal elements precipitated from other contents by electrolysis;

[0055] Among them, the melting furnace is mainly composed of a furnace, a grate, and a molten liquid collecting pipe; the inner wall of the furnace is provided with an electromagnetic heating grid, which is an efficient and low-consumption heat source; the molten liquid flows down from the grate to the molten liquid collecting pipe, and corresponding special collecting pipes and condensing devices are provided for different metal molten liquids, so as to ensure the purity of each metal element; the temperature in the melting furnace is gradually increased, and the molten liquids of different metals are collected respectively, and the elements of different metals are obtained by condensation. Specifically, the metals obtained in turn are potassium (melting point 63°C), sodium (melting point 98°C), lithium (melting point 180°C), magnesium (melting point 651°C), calcium (melting point 815°C), etc.;

[0056] S5. Hydrogen production in a cycle: Put the active metal obtained in S4 into the hydrogen reaction device 1 in S2, react with the purified water, and produce hydrogen again. Then repeat S3. After drying, dehydrating, purifying, and compressing the produced hydrogen again, store it in the hydrogen storage tank 7. Subsequently, repeat S4 again to produce the active metal again, and then put the produced active metal into the hydrogen reaction device 1 again to produce hydrogen again. By repeating this process continuously, the cyclic production of hydrogen can be achieved.

[0057] Specifically, in S1 of the above hydrogen cyclic production process, the concentration of the hydrochloric acid solution is 10% - 60%.

[0058] Specifically, in S4 of the above hydrogen cyclic production process, the electric power required for electrolysis in the electrolytic cell is green electricity, and the green electricity comes from wind power generation, photovoltaic power generation, or hydropower generation.

[0059] As the first embodiment of the above hydrogen cyclic production process: The raw water used in S1 is seawater, and the active metal used in S2 is sodium metal. Under this embodiment, the method for hydrogen cyclic production is as follows:

[0060] S1. Heat the seawater to 60°C to discharge the dissolved gas, then cool it and remove the particulate matter through plate-frame filtration to obtain purified seawater.

[0061] S2. Add the obtained purified seawater to the hydrogen reaction device 1 of the hydrogen production system, and then add an appropriate amount of sodium metal to the hydrogen reaction device 1. React sodium metal with the purified seawater to generate hydrogen and sodium hydroxide.

[0062] S3. Quickly extract the hydrogen produced in the hydrogen reaction device 1 through the induced draft fan 2 of the hydrogen production system, and transport it to the hydrogen heat exchanger 3. After heat exchange in the hydrogen heat exchanger 3 to reach room temperature, input it into the hydrogen drying section 4 in sequence for drying and dehydration, and then into the hydrogen purification device 5 for purification to obtain pure hydrogen. Finally, pump the obtained pure hydrogen into the hydrogen storage tank 7 for storage after compression by the hydrogen compressor 6.

[0063] S4. All the sodium hydroxide and other inclusions in seawater produced in the hydrogen reaction device 1 sink to the bottom of the hydrogen reaction device 1 in the form of precipitates and are discharged; then the precipitates are ground into powder and added to an acidification reactor containing a 30% hydrochloric acid solution. After acidification reaction and solid-liquid separation, a solid part and a liquid part are obtained; subsequently, the liquid part is successively subjected to evaporation, concentration, and drying, then added to an electrolytic cell, and electrolysis starts after melting at 800 °C in the electrolytic cell; during electrolysis, a variety of metal mixtures including metallic sodium are collected at the negative electrode, and chlorine gas is collected at the positive electrode; finally, the metal mixture containing metallic sodium collected at the negative electrode is placed in a melting furnace, first subjected to successive temperature increase treatments to separately collect the molten liquids of different metals, and then subjected to successive condensation treatments; the molten sodium liquid is collected at about 98 °C, and metallic sodium is obtained after condensation; at the same time, other metallic elements will be obtained successively;

[0064] S5. The prepared metallic sodium is put into the hydrogen reaction device 1 to react with purified seawater to produce hydrogen again; then S3 is repeated, and the produced hydrogen is dried, dehydrated, purified, and compressed again and stored in the hydrogen storage tank 7. Subsequently, S4 is repeated to produce metallic sodium again, and the produced metallic sodium is put into the hydrogen reaction device 1 again to produce hydrogen again; repeating this continuously can realize the cyclic preparation of hydrogen.

[0065] As the second embodiment of the above hydrogen cyclic preparation process: the raw water used in S1 is river water, and the active metal used in S2 is metallic calcium; in this embodiment, the method for hydrogen cyclic preparation is different from the method for hydrogen cyclic preparation using metallic sodium in the first embodiment above in the following aspects: 1) In S1, the river water needs to be heated to 65 °C to discharge its dissolved gases; 2) In S2, hydrogen and calcium hydroxide are produced; 3) In S4, the concentration of the hydrochloric acid solution is 35%; the molten calcium liquid is collected at about 815 °C, and metallic calcium is obtained after condensation; 4) In S4, the metal mixture collected at the negative electrode is a metal mixture containing metallic calcium; 5) In S5, the active metal participating in the hydrogen cyclic preparation is the regenerated metallic calcium.

[0066] As the third embodiment of the above hydrogen cyclic preparation process: the raw water used in S1 is domestic sewage, and the active metal used in S2 is metallic lithium; in this embodiment, the method for hydrogen cyclic preparation is different from the method for hydrogen cyclic preparation using metallic sodium in the first embodiment above in the following aspects: 1) In S1, the domestic sewage needs to be heated to 70 °C to discharge its dissolved gases; 2) In S2, hydrogen and lithium hydroxide are produced; 3) In S4, the concentration of the hydrochloric acid solution is 40%; the molten lithium liquid is collected at about 180 °C, and metallic lithium is obtained after condensation; 4) In S4, the metal mixture collected at the negative electrode is a metal mixture containing metallic lithium; 5) In S5, the active metal participating in the hydrogen cyclic preparation is the regenerated metallic lithium.

[0067] As the fourth embodiment of the above hydrogen circulation preparation process: the raw water used in S1 is tap water; the active metal used in S2 is potassium metal; in this embodiment, the method for hydrogen circulation preparation is different from the method for hydrogen circulation preparation using sodium metal in the first embodiment above in the following aspects: 1) In S1, the tap water needs to be heated to 72 °C to discharge its dissolved gas; 2) In S2, hydrogen and potassium hydroxide are produced; 3) In S4, the concentration of the hydrochloric acid solution is 42%; the molten potassium metal is collected at about 63 °C and potassium metal is obtained after condensation; 4) The metal mixture collected at the negative electrode in S4 contains potassium metal; 5) The active metal participating in the hydrogen circulation preparation in S5 is the regenerated potassium metal.

[0068] As the fifth embodiment of the above hydrogen circulation preparation process: the pure water prepared in S1 is the water prepared by distilling the water after impurity removal; the active metal used in S2 is aluminum metal; in this embodiment, the method for hydrogen circulation preparation is different from the above four embodiments in the following aspects: 1) In S1, the pure water needs to be heated to 97 °C; 2) The precipitate in S4 contains only aluminum hydroxide; 3) In S4, the concentration of the hydrochloric acid solution is 45%; aluminum chloride must be converted into aluminum oxide and then electrolyzed to regenerate aluminum metal; 4) Only aluminum metal is collected at the negative electrode in S4; 5) The active metal participating in the hydrogen circulation preparation in S5 is aluminum metal.

[0069] Finally, it should be noted that the above are only the embodiments of the present invention and do not limit the patent scope of the present invention; any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A hydrogen production system, characterized in that: Include: A hydrogen reaction device (1) is used to react the impurity-free water with the active metal to generate high-temperature hydrogen and a base corresponding to the active metal; A hydrogen induced draft fan (2) is connected to the hydrogen reaction device (1) and is used to timely extract the high-temperature hydrogen produced by the hydrogen reaction device (1); The hydrogen heat exchanger (3) is connected to the hydrogen induced draft fan (2) and is used to receive the high-temperature hydrogen extracted from the hydrogen reaction device (1) by the hydrogen induced draft fan (2), perform heat exchange treatment on the high-temperature hydrogen to make it reach room temperature, and then output room-temperature hydrogen; The hydrogen drying section (4) is connected to the hydrogen heat exchanger (3) and is used to receive the room-temperature hydrogen output from the hydrogen heat exchanger (3), dry and dehydrate the hydrogen, and then output dry hydrogen at room temperature; A hydrogen purification device (5) is connected to the hydrogen drying section (4) and is used to receive the room-temperature dry hydrogen output from the hydrogen drying section (4), purify the hydrogen, and then output room-temperature pure hydrogen; A hydrogen compressor (6) is connected to the hydrogen purification device (5) and is used to receive the room-temperature pure hydrogen output from the hydrogen purification device (5), compress the hydrogen, and output high-pressure pure hydrogen; The hydrogen storage tank (7) is connected to the hydrogen compressor (6) and is used to receive and store the high-pressure pure hydrogen output from the hydrogen compressor (6).

2. The hydrogen production system according to claim 1, characterized in that: The decontaminated water is tap water, sea water, river water, lake water, stream water, rainwater, domestic sewage or industrial wastewater obtained after heating, cooling, solid-liquid separation and removal of particulate matter and dissolved gas.

3. The hydrogen production system according to claim 1, characterized in that: The active metal is an alkali metal, an alkaline earth metal, a transition metal or aluminum.

4. The hydrogen production system according to claim 1, characterized in that: The hydrogen reaction device is a reaction kettle or a reaction tank.

5. The hydrogen production system according to claim 1, characterized in that: The hydrogen drying section (4) comprises a first shell and a desiccant arranged inside the first shell and composed of an alkali metal oxide, an alkali metal chloride, an alkali earth metal oxide, an alkaline earth metal chloride, an alkali corresponding to the alkali metal or an alkali corresponding to the alkaline earth metal and anhydrous copper sulfate.

6. The hydrogen production system according to claim 1, characterized in that: The hydrogen purification device (5) comprises a second shell and a three-layer composite membrane supported by polyimide and arranged inside the second shell, wherein the three-layer composite membrane is composed of inner and outer layers of PCL plastic and an intermediate layer of metal composite; the metal composite is composed of metal palladium and perovskite nano-microspheres, and the inner and outer layers of PCL plastic and the intermediate layer of metal composite are supported by polyimide.

7. A hydrogen circulation preparation process, characterized in that: The following steps are included: S1. Preparing impurity-free water: heating raw water to 20-90° C. to discharge dissolved gas therein, and then cooling and solid-liquid separation to remove particulate matter to obtain impurity-free water; the raw water is tap water, sea water, river water, lake water, stream water, rainwater, domestic sewage or industrial wastewater; wherein the impurity-free water is not pure water, and it still contains various soluble salts; S2, preparing hydrogen: adding the impurity-free water obtained in S1 to the hydrogen reaction device (1) of the hydrogen preparation system described in claim 1, and then adding an appropriate amount of active metal to the hydrogen reaction device (1), and utilizing the active metal to react with the impurity-free water to generate hydrogen and a base corresponding to the active metal; wherein, when the active metal encounters the impurity-free water, it will rapidly generate hydrogen and release heat, and the heat will be discharged in the form of water vapor along with the hydrogen. At the same time, a base corresponding to the active metal will also be generated, and the latter will sink to the bottom of the hydrogen reaction device (1) together with various soluble salts in the impurity-free water; S3, storage of hydrogen: the hydrogen produced by the hydrogen reaction device (1) in S2 is quickly extracted by the induced draft fan (2) of the hydrogen preparation system described in claim 1, and transported to the hydrogen heat exchanger (3), after heat exchange in the hydrogen heat exchanger (3) reaches room temperature, it is then sequentially input into the hydrogen drying section (4) for drying and dehydration, and into the hydrogen purification device (5) for purification, to obtain pure hydrogen, and finally the obtained pure hydrogen is compressed by the hydrogen compressor (6) and pumped into the hydrogen storage tank (7) for storage; S4, preparation of active metal: the alkali corresponding to the active metal produced in the hydrogen reaction device (1) in S2 and other contents in the water after impurities are all sunk to the bottom of the hydrogen reaction device (1) in the form of precipitates and discharged; then the precipitates are ground into powder and added to an acidification reactor containing hydrochloric acid solution, and after acidification reaction and solid-liquid separation, a solid part and a liquid part are obtained; then the liquid part is successively evaporated, concentrated and dried, and then added to an electrolytic cell, and electrolysis is started after melting in the electrolytic cell; during the electrolysis process, the negative electrode collects the metal mixture and the positive electrode collects chlorine; then the metal mixture collected by the negative electrode is placed in a melting furnace, first subjected to successive heating treatments, and then subjected to successive condensation treatments to obtain different metal elements; wherein the metal mixture collected at the negative electrode contains the active metal added in S2 and other metal elements precipitated from other contents by electrolysis; S5, cyclic preparation of hydrogen: the active metal obtained in S4 is put into the hydrogen reaction device (1) in S2 to react with the water after impurities are removed to produce hydrogen again; then S3 is repeated, the produced hydrogen is dried, dehydrated and purified to obtain purified hydrogen, which is compressed and stored in a hydrogen storage tank (7); then S4 is repeated again to produce active metal again, and put into the hydrogen reaction device (1) again to produce hydrogen again; this is repeated continuously to achieve cyclic preparation of hydrogen.

8. The hydrogen circulation preparation process according to claim 7, characterized in that: In S4, the concentration of the hydrochloric acid solution is 10% to 60%.

9. The hydrogen circulation preparation process according to claim 7, characterized in that: In S4, the electricity required for electrolysis in the electrolytic cell is green electricity, and the green electricity comes from wind power generation, photovoltaic power generation or hydropower generation.

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