Preparation method of metal hydride

Abstract

The invention relates to the technical field of metal hydrogenation, and discloses a metal hydride preparation method, which comprises: S1, gas introduction: continuously introducing hydrogen gas with a pressure of 1-6 MPa and a temperature of 50-500 DEG C into a vertical reactor to form an upflow from bottom to top; and S2, hydrogenation: continuously feeding metal powder with the particle size of less than 2000 microns through a feeding pipe, carrying out hydrogenation reaction under the lifting of ascending airflow, discharging the product from an air outlet pipe along with the airflow, and starting a reaction heat exchanger to control the temperature and maintain the temperature required by the reaction. According to the method, metal powder is suspended and dispersed through ascending airflow, gas-solid contact is enhanced, and the reaction efficiency is improved; upflow has the functions of reaction and heat dissipation, reaction heat is timely guided out through convection, and caking or melting caused by local overheating is prevented; by combining temperature regulation and control of the reaction heat exchanger, dynamic heat balance is realized, the reaction stability is effectively guaranteed, the purity and granularity uniformity of the product are remarkably improved, and the method is suitable for continuous and high-quality metal hydride preparation.

Description

Technical Field

[0001] This solution relates to the field of metal hydride technology, specifically to a method for preparing metal hydrides. Background Technology

[0002] Hydrogen energy is an abundant secondary energy source with advantages such as high energy density, versatility, no pollution, non-toxicity, abundant reserves, and environmental compatibility. It is an ideal secondary energy carrier to complement primary energy sources, with wide-ranging applications and the potential to play a significant role in replacing fossil fuels. The large-scale application of hydrogen energy mainly includes three stages: hydrogen production, hydrogen storage and transportation, and hydrogen utilization. High-density hydrogen storage and transportation is the bridge between hydrogen production and application, and also the bottleneck restricting the large-scale application of hydrogen energy. Hydrogen storage and transportation technologies are mainly divided into cryogenic liquid hydrogen storage, high-pressure gaseous hydrogen storage, and solid-state material hydrogen storage. Among these, solid-state metal hydrogen storage is currently the most reliable, safest, and most efficient hydrogen storage method.

[0003] Currently, the main methods for converting hydrogen into solid metals include smelting, sintering, diffusion, and ball milling. For example, Chinese patent CN102583244B discloses a hydrogenation preparation process, which involves placing processed metal powder in a reaction vessel, introducing hydrogen at the required pressure, heating the reaction vessel to the required temperature, maintaining the temperature to allow the metal powder and hydrogen to react fully, and then stopping heating to obtain a solid metal hydrogen storage material. Meanwhile, Chinese patent CN119499988B discloses a mechanical grinding preparation method, which involves solid-gas or solid-solid reactions occurring during mechanical grinding to generate new compounds.

[0004] However, none of the above-mentioned preparation processes can continuously hydrogenate solid metals. The energy consumption of a single preparation is high, and the hydrogenation preparation time is long and the efficiency is low. At the same time, because the heat generated during the hydrogenation process cannot be transferred in time, the material is heated unevenly during the hydrogenation reaction. The resulting local high temperature can cause the metal powder to agglomerate and melt, affecting the product quality. Summary of the Invention

[0005] The present invention aims to provide a method for preparing metal hydrides, so as to continuously hydrogenate solid metals, while avoiding problems such as agglomeration and melting caused by uneven heating of materials during the hydrogenation reaction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing metal hydrides, comprising the following steps: S1 Gas introduction, hydrogen gas at a pressure of 1-6 MPa and a temperature of 50-500℃ is continuously introduced into a vertically arranged reactor through an inlet pipe at the bottom of the reactor and discharged through an outlet pipe at the top of the reactor to form an upward airflow; S2 Hydrogenation, metal powder with a particle size of less than 2000 μm is continuously fed into the reactor through a feed pipe to ensure that the metal powder can undergo a hydrogenation reaction under the support of the upward airflow, thereby obtaining hydrogenated metal powder, which is discharged through the outlet pipe under the support of the upward airflow; simultaneously, a reaction heat exchanger is started to exchange heat in the hydrogenation reaction zone, so that the temperature in the hydrogenation refinement reactor is maintained within the range required for the hydrogenation reaction.

[0007] The beneficial effects of this solution are as follows: For metal hydrogenation reactions, a certain temperature needs to be maintained during the reaction to initiate the reaction and ensure its efficiency. However, since hydrogenation is an exothermic reaction, heat energy needs to be released during the reaction. If the heat generated during hydrogenation cannot be transferred in time, it may lead to uneven heating of the material, resulting in local high temperatures, causing metal powder to agglomerate and melt, affecting product quality. This solution sets the metal hydrogenation reaction process under the support of an upward airflow, so that the metal powder is supported by the upward airflow during the reaction. The temperature of the hydrogenation reaction is controlled by the upward airflow and the reaction heat exchanger. During the reaction, the upward airflow not only participates in the reaction as a reactant gas, but also acts as a convective heat exchange medium to remove the large amount of reaction heat released during hydrogenation in time, achieving dynamic heat dissipation. At the same time, the temperature of the hydrogenation reaction is controlled as a whole by the reaction heat exchanger to effectively prevent local overheating caused by heat accumulation, avoid metal powder agglomeration, sintering, or even melting, and significantly improve product purity and particle size uniformity.

[0008] Furthermore, it also includes S3 refining. Before the hydride metal powder is discharged, the gas is accelerated through a refining nozzle and then injected into the reactor, causing the hydride metal powder to collide with each other, thus reducing the particle size of the hydride metal powder.

[0009] Furthermore, it also includes S4 gas-solid separation, with the gas outlet pipe connected to a gas-solid separation unit. The gas flow carrying hydride metal discharged from the gas outlet pipe enters the gas-solid separation unit, where gas-solid separation occurs under the action of the gas-solid separation unit.

[0010] Furthermore, the S4 gas-solid separation also includes S41 discharge. The gas-solid separation unit includes a separation chamber, a first intermediate chamber, and a finished product chamber. The separation chamber is located between the first intermediate chamber and the discharge pipe. The first intermediate chamber is connected to a stamping pipe and a pressure relief pipe. The stamping pipe is connected to a stamping unit, and the pressure relief pipe is connected to the pressure relief unit. Valves are respectively installed between the first intermediate chamber and the stamping pipe, the pressure relief pipe, the separation chamber, and the finished product chamber. During discharge, the valve between the stamping pipe and the first intermediate chamber is opened, and the reaction gas is delivered to the first intermediate chamber through the stamping unit. After the gas pressure in the first intermediate chamber is equal to that in the separation chamber, the valve between the first intermediate chamber and the separation chamber is opened, and the hydride metal powder separated in the separation chamber is transferred to the first intermediate chamber. Then, the valve between the first intermediate chamber and the separation chamber is closed, and the valve between the pressure relief pipe and the first intermediate chamber is opened. The reaction gas in the first intermediate chamber is discharged through the pressure relief unit, and after the pressure in the first intermediate chamber and the finished product chamber are equal, the valve between the first intermediate chamber and the finished product chamber is opened, and the hydride metal powder is transferred to the finished product chamber.

[0011] Furthermore, the intermediate chamber is connected to a pressurization pipe and a pressure relief pipe via valves. The pressurization pipe is connected to a gas supply unit that can output hydrogen, and the hydrogen output from the gas supply unit can be injected into the intermediate chamber through the pressurization pipe to increase the pressure of the intermediate chamber. The pressure relief pipe is connected to a pressure relief unit. During unloading, the intermediate chamber is switched between high-pressure and low-pressure states through the pressurization pipe and the pressure relief pipe. The high-pressure state is connected to the separation chamber, and the low-pressure state is connected to the finished product chamber, so that the solids separated in the high-pressure separation chamber can be transferred to the atmospheric pressure storage chamber through the intermediate chamber.

[0012] Furthermore, the stamping unit includes a hydrogen storage tank and a gas compressor. The hydrogen storage tank stores hydrogen and is equipped with a hydrogen replenishment pipe. The gas compressor is located between the hydrogen storage tank and the stamping pipe, and connects the replenishment tank and the stamping pipe through the compressor.

[0013] Furthermore, it also includes S5 replacement, which involves replacing the reactant gas with an inert gas to reduce the hydrogen concentration in the reactor, gas-solid separation unit, and pressure relief unit.

[0014] Furthermore, in the S4 gas-solid separation, the pressure relief unit includes a separation chamber and a second intermediate chamber. The separation chamber is also equipped with a first inlet / outlet, a second inlet / outlet, and a third inlet / outlet. The first inlet / outlet is connected to the pressure relief pipe, the second outlet is connected to the second intermediate chamber through a valve, and the third inlet / outlet is connected to the hydrogen storage tank. A pressure relief compressor is installed between the third inlet / outlet and the hydrogen storage tank.

[0015] Furthermore, it also includes S5 replacement, which allows the reaction gas to be replaced with inert gas when production is stopped or maintenance is carried out, in order to reduce the concentration of hydrogen in the reactor, gas-solid separation unit and pressure relief unit.

[0016] Furthermore, the S2 hydrogenation step also includes S21 heat energy recovery. The separation chamber is connected to the tail gas pipe, and a recovery heat exchanger is installed on the tail gas pipe. The tail gas heat exchanger is connected to a heat storage device, and the heat storage device is connected to the reaction heat exchanger. During the hydrogenation reaction, the heat energy released by the hydrogenation reaction is transferred to the heat storage device through the recovery heat exchanger and the reaction heat exchanger.

[0017] Furthermore, the metal powder material is an alloy powder or a mixture of powders suitable for storing hydrogen, and the content of hydrogen storage metal in the alloy powder or mixture ranges from 70% to 99.99%; the reaction gas can be pure hydrogen or a mixture of hydrogen and an inert gas.

[0018] Furthermore, the metal powder material also contains additives, with the additive content ranging from 0 to 10%. Attached Figure Description

[0019] Figure 1 This is a flowchart of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the connection of the continuous preparation apparatus in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the connection of the continuous preparation apparatus in Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the connection of the gas-solid separation mechanism in Embodiment 4 of the present invention; Figure 5 This is a schematic diagram of the connection of the continuous preparation apparatus in Embodiment 5 of the present invention.

[0020] The reference numerals in the accompanying drawings include: continuous preparation apparatus 100, inlet pipe 112, outlet pipe 113, feed pipe 111, main pipe 121, refining nozzle 122, hydrogenation zone 101, transition zone 102, refining zone 103, airflow dispersion plate 104, gas-solid separation device 210, pressure relief separation device 220, separation chamber 201, first intermediate chamber 202, finished product chamber 203, second intermediate chamber 204, make-up gas storage tank 231, make-up gas compressor 232, pressure relief compressor 233, displacement storage tank 241, vent 242, reaction heat exchanger 251, and recovery heat exchanger 252. Detailed Implementation

[0021] Example 1 Example 1 is basically as shown in the appendix. Figure 1-2 As shown, Figure 1-2 The method for preparing a metal hydride, as shown, involves preparing hydride metal powder using a continuous hydrogenation apparatus. The preparation process includes the following steps: S1 venting introduces hydrogen gas at a pressure of 1-6 MPa and a temperature of 50-500℃, continuously introduced into the vertically positioned reactor through the inlet pipe 112 at the bottom of the reactor, and discharged through the outlet pipe 113 at the top of the reactor, thus forming an upward airflow; specifically, refer to... Figure 2 As shown, the continuous preparation apparatus 100 includes a reactor, which is a vertically arranged cylindrical container. The reactor is vertically divided into a hydrogenation zone 101, a transition zone, and a refining zone 103. An airflow dispersion plate 104 and an air inlet pipe 112 are welded to the lower part of the hydrogenation zone 101. The airflow dispersion plate 104 is welded to the inner wall of the cylindrical container and located below the hydrogenation zone 101. The air inlet pipe 112 is located below the airflow dispersion plate 104. An air outlet pipe 113 is welded to the upper part of the refining zone 103. During operation, the reaction gas flows into the reactor through the air inlet pipe 112, is dispersed by the airflow dispersion plate 104, and flows out through the air outlet pipe 113 to form an upward airflow.

[0022] S2 hydrogenation involves continuously feeding metal powder with a particle size of less than 2000 μm into the reactor through feed pipe 111. The metal powder material is an alloy powder or mixture suitable for storing hydrogen, and the content of hydrogen-storing metal in the alloy powder or mixture ranges from 70% to 99.99%. This ensures that the metal powder, carried by the rising airflow, undergoes the hydrogenation reaction, yielding hydrogenated metal powder. The hydrogenated metal powder is then discharged through outlet pipe 113 under the support of the rising airflow. Simultaneously, the reaction heat exchanger 251 is activated to exchange heat in the hydrogenation reaction zone, maintaining the temperature within the hydrogenation refinement reactor within the range required for the hydrogenation reaction. Specifically, as shown... Figure 2 As shown, a reaction heat exchanger 251 is fixed on the side wall of the hydrogenation zone 101, which can thermally manage the temperature within the hydrogenation zone 101. A feed pipe 111 is welded to the transition zone 102. During operation, metal powder enters the reactor through the feed pipe 111 and undergoes a hydrogenation reaction under the action of the rising airflow. The reaction heat exchanger 251 is used to control the temperature of the reactor. At the same time, the rising airflow that does not participate in the reaction carries away the heat energy released by the hydrogenation reaction through convection heat transfer. The reaction heat exchanger 251 and the rising airflow work together to form a thermal energy management device, which combines radiation heat transfer and convection heat transfer. This not only ensures the efficiency of the hydrogenation reaction, but also removes the heat of reaction in a timely manner to prevent problems such as agglomeration or melting caused by local overheating, and obtains hydrogenated metal powder with a particle size of 0~2000μm and a hydrogen storage density of 0~7.6wt%.

[0023] Example 2 Based on Example 1, the process further includes S3 refining: before the hydride metal powder is discharged, the gas is accelerated through the refining nozzle 122 and injected into the reactor, causing the hydride metal powder to collide with each other, thus reducing the particle size of the hydride metal powder. Specifically, as shown... Figure 2As shown, several refining nozzles 122 are fixed on the side wall of the refining zone 103. A main pipe 121 is fixed between the refining nozzles 122 and the refining nozzles 122 are connected to each other through the main pipe 121. Before the hydride metal powder is discharged, during operation, the reaction gas enters the refining nozzle 122 through the main pipe 121, is accelerated by the refining nozzle 122 and sprayed into the reactor, and drives the hydride metal powder to collide with each other, so that the particle size of the hydride metal powder becomes smaller.

[0024] Meanwhile, to ensure the hydrogenation reaction rate and that the metal powder completes the hydrogenation reaction before leaving the hydrogenation zone 101, the metal powder also contains an auxiliary agent, and the content of the auxiliary agent is less than 10%, in order to ensure the hydrogenation reaction rate of the metal powder and ensure the output of the product.

[0025] Example 3 Based on Example 2, it also includes S4 gas-solid separation. A gas outlet pipe 113 is connected to a gas-solid separation unit. The gas stream carrying hydride metal discharged from the outlet pipe 113 enters the gas-solid separation unit, where gas-solid separation occurs. S4 gas-solid separation also includes S41 material discharge, such as... Figure 3 As shown, the gas-solid separation unit includes a separation chamber 201 and a finished product chamber 203. The finished product chamber 203 and the separation chamber 201 are connected by a first intermediate chamber 202 through a valve. The gas flow carrying hydride metal powder undergoes gas-solid separation in the separation chamber 201 and is switched to the finished product chamber 203 at atmospheric pressure through the first intermediate chamber 202.

[0026] Specifically, refer to Figure 3 The first intermediate chamber 202 is connected to a pressurization pipe and a pressure relief pipe via valves. The pressurization pipe is connected to a gas supply unit that can output hydrogen, and the hydrogen output from the gas supply unit can be injected into the intermediate chamber through the pressurization pipe to increase the pressure of the intermediate chamber. The pressure relief pipe is connected to a pressure relief unit. During unloading, the intermediate chamber is switched between high pressure and low pressure states through the pressurization pipe and the pressure relief pipe. The high pressure state is connected to the separation chamber 201, and the low pressure state is connected to the finished product chamber 203, so that the solids separated in the high pressure state separation chamber 201 can be transferred to the atmospheric pressure storage chamber through the intermediate chamber.

[0027] The gas replenishment unit includes a gas replenishment tank 231 and a gas replenishment compressor 232. The gas replenishment tank 231 stores hydrogen and is connected to a hydrogen replenishment pipe and a pressure relief inlet via a valve. It is also connected to the gas replenishment compressor 232 via a valve. The gas replenishment compressor 232 is located between the gas replenishment tank and the pressurization pipe, and connects the gas replenishment tank 231 and the pressurization pipe via the gas replenishment compressor 232.

[0028] The pressure relief unit includes a separation chamber 201 and a finished product bin 203. The separation chamber 201 is also provided with a first inlet / outlet, a second inlet / outlet, and a third inlet / outlet. The first inlet / outlet is connected to the pressure relief pipe. The second outlet is connected to the finished product bin 203 via a valve through a second intermediate bin 204, and the second outlet is connected to the finished product bin 203 through the second intermediate bin 204. A pressure relief compressor 233 is provided between the third inlet / outlet and the replenishment gas storage tank 231, and the third inlet / outlet is connected to the replenishment gas storage tank 231 through the pressure relief compressor 233.

[0029] Specifically, such as Figure 3 As shown, the gas-solid separation unit includes a separation chamber 201, a first intermediate chamber 202, a finished product chamber 203, and a pressure relief pipe. The separation chamber 201 is used to separate gas and solid substances, and the finished product chamber 203 is used to store the solid powder separated by the separation chamber 201. The first intermediate chamber 202 is located between the separation chamber 201 and the finished product chamber 203 of the gas-solid separation unit and is connected to the pressure relief pipe and the pressure relief pipe respectively through valves, thereby switching between high pressure and low pressure states through the pressure relief pipe and the pressure relief pipe. Specifically, the separation chamber 201 is provided with a first inlet / outlet, a second inlet / outlet, and a third inlet / outlet. The first inlet / outlet is the material inlet, the second inlet / outlet is the gas outlet, and the third inlet / outlet is the solid material outlet. A filter element is provided between the second inlet / outlet and the first and third inlet / outlets, and the filter element enables gas-solid separation of the airflow carrying solid particles. The gas is output from the second inlet / outlet, and the solid is output from the third inlet / outlet. The first intermediate chamber 202 includes a chamber body with an inlet and an outlet, and is connected to a pressure relief pipe, a stamping pipe, a venting pipe, and a replacement pipe. The chamber body connects the pressure relief separation device 220 to the finished product chamber 203 through the inlet and outlet, and is connected to the pressure relief separation unit and the stamping unit through the pressure relief pipe and the stamping pipe, respectively. Through the cooperation of the stamping unit and the pressure relief separation unit, the chamber body is switched between high pressure and low pressure, thereby facilitating the transfer of hydride metal powder from the high pressure area to the low pressure finished product chamber 203. The second inlet and outlet are connected to the first inlet and outlet of the pressure relief separation device 220, and the powder is discharged into the pressure relief separation unit after being filtered by the filter element of the pressure relief separation device 220.

[0030] The pressure relief separation unit also includes a separation chamber 201 and a finished product bin 203. The structure of the separation chamber 201 is basically the same as that of the separation chamber 202, and will not be described in detail here. The second inlet and outlet of the separation chamber 201 are connected to the gas replenishment tank 231. A second intermediate bin 204 is provided between the separation chamber 201 and the finished product bin 203 of the pressure relief separation unit. The second intermediate bin 204 is basically the same as the first intermediate bin 202, except that the bin body of the second intermediate bin 204 is only provided with an inlet and an outlet, and is connected to the replacement pipe and the venting pipe through valves. The bin body connects the pressure relief separation device 220 to the finished product bin 203 through the inlet and outlet, and uses the replacement pipe and the venting pipe to discharge the hydrogen in the bin. The finished product bin 203 is located on the outlet of the second intermediate bin 204.

[0031] S5 replacement involves replacing the reactant gas with an inert gas to reduce the hydrogen concentration in the reactor, gas-solid separation unit, and pressure relief unit. Specifically, for example... Figure 3 As shown, the continuous reaction device also includes a replacement unit, which includes a replacement pipe and a vent pipe. The replacement pipe is connected to an inert gas. During maintenance or after the reaction is completed, the inert gas replaces the reaction gas in the hydrogenation system through the replacement pipe and discharges the reaction gas through the vent pipe. Specifically, the replacement pipe and the vent pipe are connected to the first intermediate chamber 202, the second intermediate chamber 204, and the pressurization module through valves, respectively. The replacement pipe is also connected to a replacement storage tank 241, which stores inert gas and is connected to a gas supply pipe through a valve. The vent pipe is equipped with a vent port that is connected to the atmosphere. When production is stopped or maintenance is performed, the valves corresponding to the first intermediate chamber 202, the second intermediate chamber 204, and the pressurization module are opened, and the inert gas discharges the reaction gas in the first intermediate chamber 202, the second intermediate chamber 204, and the pressurization module through the replacement pipe and the vent pipe.

[0032] Example 3 Example 3 is basically the same as Example 2, except that, as Figure 4 As shown, a pressure relief compressor 233 is installed between the second inlet / outlet and the gas replenishment tank 231. When depressurizing, the pressure relief compressor 233 is started, and the hydrogen in the first intermediate chamber 202 is filtered through the separation chamber 201 of the pressure relief separation device 220 and then pressed into the gas replenishment tank 231 for temporary storage, so that the pressure of the first intermediate chamber 202 and the finished product chamber 203 are closer, further reducing the damage to the equipment caused by pressure changes.

[0033] Example 4 The embodiments are basically the same as Embodiment 3, except that, as Figure 5As shown, the separation mechanism includes at least two sets of gas-solid separation units to form a particle size classification device, which classifies hydride metal powders of different particle sizes during the production process to improve product consistency. As shown in the figure, in this embodiment, the separation mechanism is provided with three gas-solid separation units, the separation chambers 201 of adjacent gas-solid separation units are connected in series, and the filter holes of the filter element are progressively smaller, so as to store hydride metal powders of different particle sizes separately; a balance pipe is provided between adjacent first intermediate chambers 202, and a balance valve is provided on the balance pipe. When unloading, the balance valve is closed, and when stamping, the balance valve is opened for rapid stamping.

[0034] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that the technical means for solving problems in the above embodiments of the present invention can be used in combination to solve multiple technical problems simultaneously. For those skilled in the art, several modifications and improvements can be made without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing a metal hydride, characterized in that: The process includes the following steps: S1 Aeration: Reaction gas at a pressure of 1-6 MPa and a temperature of 50-500℃ is continuously introduced into the vertically arranged reactor through the inlet pipe at the bottom of the reactor and discharged through the outlet pipe at the top of the reactor to form an upward airflow; S2 Hydrogenation: Metal powder with a particle size of less than 2000 μm is continuously fed into the reactor through the feed pipe to ensure that the metal powder can undergo hydrogenation under the support of the upward airflow, resulting in hydrogenated metal powder with a particle size of 0-2000 μm and a hydrogen storage density of 0-7.6 wt%. The hydrogenated metal powder is discharged through the outlet pipe under the support of the upward airflow; Simultaneously, the reaction heat exchanger is activated to exchange heat in the hydrogenation reaction zone, so that the temperature in the hydrogenation refinement reactor is maintained within the range required for the hydrogenation reaction.

2. The method for preparing a metal hydride according to claim 1, characterized in that: It also includes S3 refining, where gas is accelerated through a refining nozzle and injected into the reactor before the hydride metal powder is discharged, causing the hydride metal powder to collide with each other, thus reducing the particle size of the hydride metal powder.

3. The method for preparing a metal hydride according to claim 2, characterized in that: It also includes S4 gas-solid separation, with an outlet pipe connected to a gas-solid separation unit. The gas flow carrying hydride metal discharged from the outlet pipe enters the gas-solid separation unit, where gas-solid separation occurs under the action of the gas-solid separation unit.

4. The method for preparing a metal hydride according to claim 3, characterized in that: S4 gas-solid separation also includes S41 discharge. The gas-solid separation unit includes a separation chamber, a first intermediate chamber, and a finished product chamber. The separation chamber is located between the first intermediate chamber and the discharge pipe. The first intermediate chamber is connected to a stamping pipe and a pressure relief pipe. The stamping pipe is connected to a stamping unit, and the pressure relief pipe is connected to a pressure relief unit. Valves are respectively installed between the first intermediate chamber and the stamping pipe, the pressure relief pipe, the separation chamber, and the finished product chamber. During discharge, the valve between the stamping pipe and the first intermediate chamber is opened, and the reaction gas is delivered to the first intermediate chamber through the stamping unit. After the gas pressure in the first intermediate chamber is equal to that in the separation chamber, the valve between the first intermediate chamber and the separation chamber is opened, and the hydride metal powder separated in the separation chamber is transferred to the first intermediate chamber. Then, the valve between the first intermediate chamber and the separation chamber is closed, and the valve between the pressure relief pipe and the first intermediate chamber is opened. The reaction gas in the first intermediate chamber is discharged through the pressure relief unit, and after the pressure in the first intermediate chamber and the finished product chamber are equal, the valve between the first intermediate chamber and the finished product chamber is opened, and the hydride metal powder is continuously transferred to the finished product chamber.

5. The method for preparing a metal hydride according to claim 4, characterized in that: The stamping unit includes a hydrogen storage tank and a gas compressor. The hydrogen storage tank stores hydrogen and is equipped with a hydrogen replenishment pipe. The gas compressor is located between the hydrogen storage tank and the stamping pipe, and connects the replenishment tank and the stamping pipe through the compressor.

6. The method for preparing a metal hydride according to claim 5, characterized in that: In the S4 gas-solid separation process, the pressure relief unit includes a separation chamber and a second intermediate chamber. The separation chamber is also equipped with a first inlet / outlet, a second inlet / outlet, and a third inlet / outlet. The first inlet / outlet is connected to the pressure relief pipe, the second outlet is connected to the second intermediate chamber through a valve, and the third inlet / outlet is connected to the hydrogen storage tank. A pressure relief compressor is installed between the third inlet / outlet and the hydrogen storage tank.

7. The method for preparing a metal hydride according to claim 6, characterized in that: It also includes S5 replacement, which allows the reaction gas to be replaced with an inert gas when production is stopped or maintenance is carried out, in order to reduce the concentration of hydrogen in the reactor, gas-solid separation unit and pressure relief unit.

8. The method for preparing a metal hydride according to claim 7, characterized in that: The S2 hydrogenation step also includes S21 heat recovery. The separation chamber is connected to the tail gas pipe, and a recovery heat exchanger is installed on the tail gas pipe. The tail gas heat exchanger is connected to a heat storage device, and the heat storage device is connected to the reaction heat exchanger. During the hydrogenation reaction, the heat energy released by the hydrogenation reaction is transferred to the heat storage device through the recovery heat exchanger and the reaction heat exchanger.

9. The method for preparing a metal hydride according to claim 1, characterized in that: The metal powder material is an alloy powder or mixture powder suitable for storing hydrogen, and the content of hydrogen storage metal in the alloy powder or mixture powder ranges from 70% to 99.99%; the reaction gas can be pure hydrogen or a mixture of hydrogen and inert gas.

10. The method for preparing a metal hydride according to claim 9, characterized in that: Metal powder materials also contain additives, with the additive content ranging from 0 to 10%.

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