CN112624042B - Chemical hydrogen production system and hydrogen production method - Google Patents
Chemical hydrogen production system and hydrogen production method Download PDFInfo
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- CN112624042B CN112624042B CN202011489749.9A CN202011489749A CN112624042B CN 112624042 B CN112624042 B CN 112624042B CN 202011489749 A CN202011489749 A CN 202011489749A CN 112624042 B CN112624042 B CN 112624042B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/06—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents
- C01B3/08—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents with metals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
- C01B3/56—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with solids; Regeneration of used solids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
- C01B2203/0465—Composition of the impurity
- C01B2203/0495—Composition of the impurity the impurity being water
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention relates to a chemical hydrogen production system and a hydrogen production method, wherein the hydrogen production system comprises: a feeding unit: comprises a solid material feeding subunit and a water feeding subunit; a reactor: the device comprises a heat insulation sleeve and an inner container, wherein the heat insulation sleeve is fixed outside the inner container, the inner container is connected with a feeding unit, and a catalyst is placed in the inner container; a drying unit: is connected with a gas outlet of the reactor and is used for drying the hydrogen; a hydrogen storage unit: connected with the drying unit and used for storing the dried hydrogen or providing the hydrogen to the outside; a purging unit: the device comprises a vacuumizing unit and a feeding bin purging unit, wherein the vacuumizing unit is connected with a hydrogen storage unit and is used for vacuumizing the reactor, the drying unit and the hydrogen storage unit; the feeding bin purging unit is connected with the hydrogen storage unit and used for purging the solid material feeding subunit. The invention can generate hydrogen and a large amount of heat, realizes heat and hydrogen combined supply and has high safety.
Description
Technical Field
The invention relates to the technical field of chemical hydrogen production, in particular to a chemical hydrogen production system and a hydrogen production method.
Background
At present, a plurality of solutions are available for solving the difficulty of using a large amount of hydrogen in remote areas or in the field, such as hydrogen production by water electrolysis, hydrogen production by methanol reforming, chemical hydrogen production and the like. The chemical hydrogen production is the most suitable scheme for the field hydrogen with low power consumption, simple structure and convenient supply. At present, chemical hydrogen production comprises several types commonly used for producing hydrogen by using metal water, silicon iron powder, hydroboron and the like. The ferrosilicon powder adopts strong base for hydrogen production, and is not friendly to equipment and operators; the cost of producing hydrogen from sodium borohydride is too high. Moreover, because the requirement of hydrogen production on safety is high, the existing hydrogen production equipment is generally complex, has large cost investment and is not suitable for outdoor hydrogen.
Therefore, there is a need in the art for a hydrogen production system and a hydrogen production method that are simple and safe.
Disclosure of Invention
The present invention is directed to a system for chemically producing hydrogen, which overcomes the above-mentioned drawbacks of the prior art.
The present application also aims to provide a hydrogen production method using the above hydrogen production system.
In order to achieve the object of the present invention, the present application provides the following technical solutions.
In a first aspect, the present application provides a chemical hydrogen production system comprising:
a feeding unit: the device comprises a solid material feeding subunit and a water feeding subunit, wherein the solid material feeding subunit is used for adding a solid metal material into a reactor, and the water feeding subunit is used for adding water into the reactor;
a reactor: the feeding device comprises a heat insulation sleeve and an inner container, wherein the heat insulation sleeve is fixed outside the inner container, the inner container is connected with a feeding unit, and a catalyst is placed in the inner container;
a drying unit: the gas outlet of the reactor is connected for drying the hydrogen;
a hydrogen storage unit: connected with the drying unit and used for storing the dried hydrogen or providing the hydrogen to the outside;
a purging unit: the device comprises a vacuumizing unit and a feeding bin purging unit, wherein the vacuumizing unit is connected with a hydrogen storage unit and is used for vacuumizing the reactor, the drying unit and the hydrogen storage unit; and the feeding bin purging unit is connected with the hydrogen storage unit and is used for purging the solid material feeding subunit.
The reactor used in the application is sealed by the flange, and the inner container of the reactor can be quickly disassembled; all pipelines should be subjected to heat preservation treatment to prevent heat loss; the reactor inner container contains a catalyst for catalyzing metal hydrolysis to produce hydrogen, the catalyst mainly comprises water-soluble salts and a defoaming agent, the salts mainly comprise one or more of sodium chloride, sodium stannate, aluminum hydroxide, calcium oxide, sodium silicate, sodium metaaluminate and the like, and the defoaming agent is mainly used for reducing foams generated by reaction and is common and commercially available defoaming agent; the inner container of the reactor is used for a certain number of times, and after hydrogen is produced for a plurality of times, the inner container is almost all precipitated by hydroxide and needs to be replaced again; the reactor is provided with a safety valve, and when the pressure of the reactor is too high, the safety valve can be used for releasing the pressure to ensure the safety of the system; the reactor is provided with a liquid level sensor which monitors the liquid level in the liner and controls water inflow. As used herein, a solid metal material is aluminum or magnesium in a granular form, including but not limited to, pure metal granules, metal powder granulation, and scrap metal recovery granulation.
In an embodiment of the first aspect, the water feeding subunit includes a hot water tank, a first heat exchanger, and a second heat exchanger, where the first heat exchanger and the second heat exchanger are sequentially disposed on a connection pipeline between the reactor and the drying unit, a cold source inlet of the second heat exchanger is connected to a water source, a cold source outlet of the second heat exchanger is connected to the hot water tank, a cold source inlet of the first heat exchanger is connected to the hot water tank, a cold source outlet of the first heat exchanger is connected to a hot user, and the hot water tank is connected to the inner container and is configured to provide water to the inner container. Because magnesium or aluminum reacts with water to generate hydrogen under the action of a catalyst, the hydrogen is an exothermic reaction and can release a large amount of heat, the heat enables water in the liner to be gasified and discharged from the liner along with the hydrogen, and at the moment, the temperature of the hydrogen (containing water vapor) can reach 150-200 ℃, so that the hydrogen has high heat energy utilization value. In order to utilize the part of heat energy, a first heat exchanger and a second heat exchanger are arranged, water in the hot water tank is heated by utilizing water vapor to obtain low-pressure steam, and the part of low-pressure steam can be directly supplied to a water vapor user for direct use and can also be returned to the hot water tank for heating the water in the hot water tank. The temperature of hydrogen (containing water vapor) passing through the first heat exchanger is reduced to reach about 100 ℃, part of water vapor is condensed into water, then the hydrogen (containing the water vapor and part of condensed water) enters the second heat exchanger to exchange heat with cold water, the cold water is heated and then enters the hot water tank, most of the water vapor in the hydrogen is condensed into water, the water vapor is sent into the water-gas separator to be separated, and then the hydrogen passes through the dryer to obtain the dried hydrogen. Because of the existence of the first heat exchanger and the second heat exchanger, the water in the hot water tank is hot water, and the hot water is introduced into the inner container, so that the reaction can be accelerated. Can also directly provide hot water for the outside, and is suitable for field environment.
In one embodiment of the first aspect, the hot user comprises a hot water tank or a water vapor user.
In one embodiment of the first aspect, the drying unit comprises a moisture separator and a dryer connected in series. The moisture separator and the dryer used in the application are both in the prior art, and the dryer can adopt molecular sieves, water-absorbent resin or allochroic silica gel and the like.
In an implementation manner of the first aspect, the solid material feeding subunit includes a funnel, a first electric ball valve, a feeding bin and a second electric ball valve, which are connected in sequence, wherein the feeding bin is a closed bin, and an outlet of the second electric ball valve is communicated with the reactor inner container. The first electric ball valve and the second electric ball valve are arranged to be matched with a subsequent hydrogen production method, so that air is prevented from being mixed into the system.
In one embodiment of the first aspect, the hydrogen storage unit comprises a storage tank, the storage tank is provided with one inlet and at least three outlets, the inlet is connected with the drying unit, one outlet is connected with the hydrogen user, one outlet is connected with the vacuumizing unit through a three-number electric ball valve, and the other outlet is connected with the feeding bin purging unit.
In one embodiment of the first aspect, the feed bin purge unit comprises a first solenoid valve, a first filter, a second solenoid valve and a second filter, wherein one outlet of the storage tank is connected with the first solenoid valve, the first filter, the feed bin, the second filter and the second solenoid valve in sequence.
In one embodiment of the first aspect, a heating device is arranged between the thermal insulation sleeve and the inner container. When the system is used for the first time or used again after shutdown, the water in the hot water tank is not heated because the reaction is not started, namely the water entering the inner container is cold water, and the reaction speed is slow at the moment. In order to increase the reaction rate, a heating device is provided outside the inner container to heat the cold water and accelerate the initial reaction rate. When the reaction is normally carried out, the heating device is closed. The heating device that this application was used is prior art, like heating wire etc. and power equipment energy supplies such as usable battery.
In a second aspect, the present application also provides a chemical hydrogen production method using the chemical hydrogen production system as described above, characterized in that the method comprises the steps of:
(1) closing the connection between the feeding unit and the hydrogen storage unit and the outside, opening the connection between the vacuumizing unit and the hydrogen storage unit, vacuumizing the system by using the vacuumizing unit to ensure that the pressure in the system is lower than the atmospheric pressure, disconnecting the vacuumizing unit from the hydrogen storage unit, and checking the air tightness of the system;
(2) when the air tightness is checked to be free of problems, the water feeding subunit firstly adds water into the liner, then the solid material feeding subunit adds a small amount of solid metal materials into the liner, when the pressure in the system is restored to the atmospheric pressure, the connection between the vacuumizing unit and the hydrogen storage unit is opened, the vacuumizing unit is used for vacuumizing the system again, and the connection between the vacuumizing unit and the hydrogen storage unit is disconnected after a period of time;
(3) the solid material feeding subunit adds a solid metal material into the liner, hydrogen is dried by the drying unit and then enters the hydrogen storage unit for storage, and when the hydrogen needs to be used, the hydrogen storage unit supplies the hydrogen to the outside;
(4) when solid metal materials need to be added, a channel between the solid material feeding subunit and the outside is opened, then the solid metal materials are placed in the solid material feeding subunit, then the channel between the solid material feeding subunit and the outside is closed, a feeding bin purging unit is opened, the solid material feeding subunit is purged by using hydrogen in a hydrogen storage unit, then the solid material feeding subunit and the liner are opened, so that the solid metal materials fall into the liner, then the solid material feeding subunit and the liner are disconnected, the feeding bin purging unit is closed, hydrogen enters a hydrogen storage unit for storage after being dried by a drying unit, and when the hydrogen needs to be used, the hydrogen storage unit provides the hydrogen to the outside.
Compared with the prior art, the invention has the beneficial effects that:
(1) the structure is simple, hydrogen and hot water or water vapor can be provided at the same time, and the device is suitable for being used in the field environment;
(2) air cannot be mixed in the whole hydrogen production process, extra nitrogen is not needed for purging, the safety is high, and the cost is low.
Drawings
FIG. 1 is a schematic diagram of the connections of a hydrogen production system according to the present application.
In the attached drawings, 1 is a funnel, 2 is a first electric ball valve, 3 is a feeding bin, 4 is a second electric ball valve, 5 is an inner container, 6 is a heat preservation sleeve, 7 is an electric heating wire, 8 is a first heat exchanger, 9 is a second heat exchanger, 10 is a first water pump, 11 is a hot water tank, 12 is a second water pump, 13 is a third water pump, 14 is a water-gas separator, 15 is a dryer, 16 is a storage tank, 17 is a third electromagnetic valve, 18 is a pressure reducing valve, 19 is a hydrogen user, 20 is a third electric ball valve, 21 is a vacuum extractor, 22 is a first electromagnetic valve, 23 is a first filter, 24 is a second filter, 25 is a second electromagnetic valve, and 26 is a safety valve.
Detailed Description
Unless otherwise defined, technical or scientific terms used herein in the specification and claims should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All numerical values recited herein as between the lowest value and the highest value are intended to mean all values between the lowest value and the highest value in increments of one unit when there is more than two units difference between the lowest value and the highest value.
While specific embodiments of the invention will be described below, it should be noted that in the course of the detailed description of these embodiments, in order to provide a concise and concise description, all features of an actual implementation may not be described in detail. Modifications and substitutions to the embodiments of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention, and the resulting embodiments are within the scope of the present invention.
Examples
The following will describe in detail the embodiments of the present invention, which are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and the specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A chemical hydrogen production system is shown in figure 1 and comprises a feeding unit, a reactor, a drying unit, a hydrogen storage unit and a purging unit, and the chemical hydrogen production system has the following specific structure:
a feeding unit: including solid material feeding subelement and water feeding subelement, solid material feeding subelement is including funnel 1, first electric ball valve 2, feeding storehouse 3 and the electronic ball valve 4 of second that connect gradually, and wherein, feeding storehouse 3 is airtight storehouse, and the export and the reactor inner bag 5 intercommunication of the electronic ball valve 4 of second. The water feeding subunit comprises a hot water tank 11, a first heat exchanger 8 and a second heat exchanger 9, wherein the first heat exchanger 8 and the second heat exchanger 9 are sequentially arranged on a connecting pipeline between the reactor and the drying unit, a cold source inlet of the second heat exchanger 9 is connected with a water source, a cold source outlet of the second heat exchanger 9 is connected with the hot water tank 11, a cold source inlet of the first heat exchanger 8 is connected with the hot water tank 11, a cold source outlet of the first heat exchanger 8 is connected with a hot user, and the hot water tank 11 is connected with the liner 5 and used for supplying water to the liner 5.
A reactor: the catalyst-free heat preservation device comprises a heat preservation sleeve 6 and an inner container 5, wherein the inner container 5 is detachably arranged in the heat preservation sleeve 6, and a catalyst is placed in the inner container 5; an electric heating wire 7 is arranged between the heat preservation sleeve 6 and the inner container 5, and a safety valve 26 is arranged on the inner container 5 to prevent the inner container 5 from being exploded due to overlarge pressure.
A drying unit: the hydrogen gas drying device comprises a water-gas separator 14 and a dryer 15 which are connected in sequence, wherein a gas outlet of the inner container 5 is connected with a first heat exchanger 8, a second heat exchanger 9, the water-gas separator 14 and the dryer 15 in sequence, and the water in the hydrogen gas can be completely removed by the arrangement.
A hydrogen storage unit: the hydrogen storage unit is a storage tank 16, the storage tank 16 is provided with an inlet and at least three outlets, the inlet is connected with an outlet of the dryer 15, one outlet of the storage tank 16 is connected with a hydrogen user 19 sequentially through a third electromagnetic valve 17 and a pressure reducing valve 18, one outlet of the storage tank 16 is connected with a vacuumizing machine 21 through a third electric ball valve, and the other outlet of the storage tank 16 is connected with the feeding bin 3 purging unit.
A purging unit: the device comprises a vacuumizing machine 21 and a blowing unit of a feeding bin 3, wherein the vacuumizing machine 21 is connected with a storage tank 16 through a third electric ball valve and is used for vacuumizing a reactor, a drying unit and a hydrogen storage unit; the feeding bin 3 purging unit comprises a first solenoid valve, a first filter 23, a second solenoid valve and a second filter 24, wherein one outlet of the storage tank 16 is connected with the first solenoid valve, the first filter 23, the feeding bin 3, the second filter 24 and the second solenoid valve in sequence.
The working principle of the system is as follows:
first, starting up for the first time to produce hydrogen (or first hydrogen production after replacing the inner container 5):
all the controllable valves are closed, after the inner container 5 (containing catalyst) is filled into the reactor, the third electric ball valve 20 is opened, and the vacuumizing machine 21 is opened for vacuumizing; and closing the third electric ball valve 20 and the vacuum extractor 21 after vacuum extraction is finished, and detecting the vacuum degree in the system after a period of time, thereby detecting the air tightness of the system. The vacuum has two purposes: and (4) emptying and checking the air tightness, wherein the air tightness of the surface has a problem if the vacuum degree is insufficient all the time.
After no air leakage is confirmed, the third water pump 13 and the first water pump 10 are opened, water source (cold water) enters the inner container 5 after passing through the hot water tank 11, and the water source (cold water) stops when reaching a specified liquid level.
Opening first electric ball valve 2, throwing the solid metal material into feeding storehouse 3 from funnel 1, after accomplishing to drop into, closing first electric ball valve 2, opening second electric ball valve 4, close about 2s later, the solid metal material falls inner bag 5 from feeding storehouse 3 and begins the reaction. Because the water in the inner container 5 is cold water, the hydrogen production speed is very low, and therefore the heating wire 7 can be opened to heat, and the reaction speed is accelerated. And when the pressure in the system is recovered to the normal pressure, the third electric ball valve 20 and the vacuum extractor 21 are opened again for vacuum extraction, after the system runs for a period of time, the third electric ball valve 20 and the vacuum extractor 21 are closed, and at the moment, the inside of the system is basically and acquiescently completely emptied.
The reaction is continued, hydrogen enters a storage tank 16 for storage after heat exchange is carried out through a first heat exchanger 8 and a second heat exchanger 9, water is distributed through a water-gas separator 14, and a dryer 15 is dried, and when the hydrogen is required to be used, a third electromagnetic valve 17 is opened to supply the hydrogen to a hydrogen user 19, wherein the hydrogen user 19 is a fuel cell or the like;
in the hydrogen production process, a large amount of heat is released, the first water pump 10 and the second water pump 12 are started to carry out circulating water cooling, cold water firstly passes through the second heat exchanger 9 and is heated to more than 70 ℃ to enter the hot water tank 11 for storage, and then circularly enters the first heat exchanger 8 through the second water pump 12 to carry out evaporation and heat exchange, so that hot water and steam can be provided outwards.
Secondly, starting the machine for the first time (hydrogen exists in the system and the pressure is applied)
Open first electric ball valve 2, close first electric ball valve 2 after having added solid metal material, open first solenoid valve 22, open second solenoid valve 25 after waiting for about 15s again, about 10s can be exhausted the air in feeding storehouse 3 completely, wait for about 15s after closing second solenoid valve 25, close first solenoid valve 22 after the pressure is stable again, be hydrogen in feeding storehouse 3 this moment completely, and pressure and 5 pressure differences of inner bag are little, open second electric ball valve 4 and can realize the area and press the feeding.
After the feeding is finished, the third water pump 133 is opened to feed water, the third water pump 13 is stopped after the water reaches the specified liquid level, the solid metal material and the water can rapidly carry out hydrogen production reaction, and the process is the same as the principle and the process of hydrogen production when the machine is started for the first time;
in the hydrogen production process, a large amount of heat is released, the first water pump 10 and the second water pump 12 are started to carry out circulating water cooling, cold water firstly passes through the second heat exchanger 9 and is heated to more than 70 ℃ to enter the hot water tank 11 for storage, and then circularly enters the first heat exchanger 8 through the second water pump 12 to carry out evaporation and heat exchange, so that hot water and steam can be provided outwards.
The embodiments described above are intended to facilitate the understanding and appreciation of the application by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present application is not limited to the embodiments herein, and those skilled in the art who have the benefit of this disclosure will appreciate that many modifications and variations are possible within the scope of the present application without departing from the scope and spirit of the present application.
Claims (7)
1. A chemical hydrogen production system, comprising:
a feeding unit: the device comprises a solid material feeding subunit and a water feeding subunit, wherein the solid material feeding subunit comprises a funnel, a first electric ball valve, a feeding bin and a second electric ball valve which are sequentially connected, the feeding bin is a closed bin, an outlet of the second electric ball valve is communicated with an inner container of a reactor, the solid material feeding subunit is used for adding solid metal materials into the reactor, and the water feeding subunit is used for adding water into the reactor;
a reactor: the feeding device comprises a heat insulation sleeve and an inner container, wherein the heat insulation sleeve is fixed outside the inner container, the inner container is connected with a feeding unit, and a catalyst is placed in the inner container;
a drying unit: is connected with a gas outlet of the reactor and is used for drying the hydrogen;
a hydrogen storage unit: connected with the drying unit and used for storing the dried hydrogen or providing the hydrogen to the outside;
a purging unit: the device comprises a vacuumizing unit and a feeding bin purging unit, wherein the vacuumizing unit is connected with a hydrogen storage unit and is used for vacuumizing the reactor, the drying unit and the hydrogen storage unit; the feeding bin purging unit comprises a first electromagnetic valve, a first filter, a second electromagnetic valve and a second filter, the hydrogen storage unit is sequentially connected with the first electromagnetic valve, the first filter, the solid material feeding subunit, the second filter and the second electromagnetic valve, and the feeding bin purging unit is used for purging the solid material feeding subunit.
2. The chemical hydrogen production system of claim 1, wherein the water feeding subunit comprises a hot water tank, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are sequentially arranged on a connecting pipeline of the reactor and the drying unit, a cold source inlet of the second heat exchanger is connected with a water source, a cold source outlet of the second heat exchanger is connected with the hot water tank, a cold source inlet of the first heat exchanger is connected with the hot water tank, a cold source outlet of the first heat exchanger is connected with a hot user, and the hot water tank is connected with the inner container and is used for supplying water to the inner container.
3. A chemical hydrogen production system as claimed in claim 2, wherein the heat user comprises a hot water tank or a steam user.
4. A chemical hydrogen production system according to claim 1, wherein the drying unit comprises a moisture separator and a dryer connected in series.
5. A chemical hydrogen production system according to claim 1, wherein the hydrogen storage unit comprises a storage tank having an inlet and at least three outlets, the inlet being connected to the drying unit, one outlet being connected to the hydrogen user, one outlet being connected to the vacuum pumping unit via a three-way motorized ball valve, and the other outlet being connected to the feed bin purge unit.
6. A chemical hydrogen production system according to claim 1, wherein a heating device is provided between the thermal insulation sleeve and the inner container.
7. A method for chemically producing hydrogen by using the chemical hydrogen production system according to any one of claims 1 to 6, comprising the steps of:
(1) closing the connection between the feeding unit and the hydrogen storage unit and the outside, opening the connection between the vacuumizing unit and the hydrogen storage unit, vacuumizing the system by using the vacuumizing unit to ensure that the pressure in the system is lower than the atmospheric pressure, disconnecting the vacuumizing unit from the hydrogen storage unit, and checking the air tightness of the system;
(2) when the air tightness is checked to be free from problems, the water feeding subunit firstly adds water into the liner, then the solid material feeding subunit adds a small amount of solid metal materials into the liner, when the pressure in the system is recovered to the atmospheric pressure, the connection between the vacuumizing unit and the hydrogen storage unit is opened, the vacuumizing unit is used for vacuumizing the system again, and the connection between the vacuumizing unit and the hydrogen storage unit is disconnected after a period of time;
(3) the solid material feeding subunit adds a solid metal material into the liner, hydrogen is dried by the drying unit and then enters the hydrogen storage unit for storage, and when the hydrogen needs to be used, the hydrogen storage unit provides the hydrogen outwards;
(4) when solid metal materials need to be added, a channel between the solid material feeding subunit and the outside is opened, then the solid metal materials are placed in the solid material feeding subunit, the channel between the solid material feeding subunit and the outside is closed, the feeding bin purging unit is opened, the solid material feeding subunit is purged by using hydrogen in the hydrogen storage unit, then the solid material feeding subunit is opened to be connected with the liner, so that the solid metal materials fall into the liner, then the solid material feeding subunit and the liner are disconnected, the feeding bin purging unit is closed, the hydrogen enters the hydrogen storage unit for storage after being dried by the drying unit, and when the hydrogen needs to be used, the hydrogen storage unit provides the hydrogen outwards.
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