Device and method for producing hydrogen from magnesium hydride

A hydrogen production device and a technology of magnesium hydride, applied in the field of hydrogen production, can solve the problems of elusiveness, fast diffusion, and low hydrogen production efficiency, and achieve extended use times and time, stable and continuous self-circulating hydrogen production, and long-term satisfaction. The effect of smooth requirements

Active Publication Date: 2019-07-12
中国科学院嘉兴轻合金技术工程中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, hydrogen also has defects such as light weight, elusiveness, and fast diffusion speed, which makes the safe storage and transportation of hydrogen difficult. Whether it is high-pressure gasification or low-temperature liquefaction, the storage and transportation methods are all harmful to gas cylinders or pipelines. put forward high technical requirements
Therefore, the application of hydrogen energy needs to solve the three limitations of hydrogen production, storage, and transportation. The current industrial hydrogen production, whether it uses fossil fuels or electrolyzed water, has the following defects: hydrogen production efficiency Not high; high energy consumption; serious environmental pollution; hydrogen storage problem has not been effectively solved, etc.
The disadvantages of the above-mentioned self-circulating solution hydrogen production device are: the automatic feeding of solid reactants cannot be realized, and the reaction liquid can be automatically conveyed, which can only realize the stable and continuous hydrogen production reaction under the condition of sufficient solid reactants When the solid reactant is exhausted, the reaction needs to be stopped, then the reactant is added, and then the reaction is started again. The operation process is cumbersome and complicated, and it is impossible to truly realize the immediate production, supply, and use of hydrogen.
This hydrolysis hydrogen production technology uses magnesium chloride as a reaction accelerator to delay the production of magnesium hydroxide. In the actual application process, it is found that although it can play a delaying role, it will still affect the hydrogen production rate and reduce the hydrogen production efficiency.

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  • Device and method for producing hydrogen from magnesium hydride
  • Device and method for producing hydrogen from magnesium hydride
  • Device and method for producing hydrogen from magnesium hydride

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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a hydrogen production device using magnesium hydride as a raw material includes a hydrolysis reaction box 19, and the hydrolysis reaction box 19 has a feed inlet. In order to be able to control the hydrogen production amount of hydrogen on-line according to the demand of the load (for example, a hydrogen fuel cell), to realize hydrogen production and controllable hydrogen at any time, the hydrogen production device also includes a feeding unit, and the feeding unit passes through the feed port The magnesium hydride is delivered into the hydrolysis reaction box 19, so that the magnesium hydride and the water in the hydrolysis reaction box 19 undergo a hydrolysis reaction to generate hydrogen. Magnesium hydride has a high hydrogen storage capacity, abundant sources of raw materials, and little impact on the environment. Therefore, in this embodiment, magnesium hydride is used as a raw material to produce hydrogen, which can well overcome the exi...

Embodiment 2

[0069] In the present embodiment, first input 0.5mol / L MgCl in the hydrolysis reaction box 2 solution, where Mg 2+ The ion concentration is 0.5mol / L, Cl - The concentration of ion is 1.0mol / L, then adds magnesium hydride in the hydrolysis reaction tank again, as figure 2 As shown, at the above ion concentration MgCl 2 Under the solution, the efficiency of hydrogen production by hydrolysis is close to 100%. The average hydrogen production rate for the first feeding is 4.7mL / min. The solution can be recycled 8 times. In order to ensure the stability of the hydrolysis rate, the preferred number of solution cycles is 3 times.

[0070] The MgCl 2 The principle that the solution can promote the reaction to produce hydrogen is:

[0071] MgCl 2 +2H 2 O→Mg(OH) 2aq ↓+2HCl (1)

[0072] MgH 2 +2HCl→MgCl 2 +2H 2 ↑ (2)

[0073] Mg(OH) 2su ↓+2HCl→MgCl 2 +2H 2 O (3)

[0074] That is, magnesium chloride and water react to form magnesium hydroxide and hydrochloric acid in the s...

Embodiment 3

[0076] In the present embodiment, first input 0.5mol / L MgCl in the hydrolysis reaction box 2 solution and 0.05mol / L MgSO 4 solution, where Mg 2+ The concentration of ions is 0.55mol / L, Cl - The ion concentration is 1.0mol / L, SO 4 2- The concentration of ions is 0.05mol / L, and magnesium hydride is added in the hydrolysis reaction box afterwards, as image 3 As shown, at the above ion concentration MgCl 2 solution and MgSO 4 Under the mixed solution of the solution, the efficiency of hydrolysis hydrogen production is close to 98%, the average hydrogen production rate of the first feeding is 9.4mL / min, and the feeding amount of magnesium hydride reaches 0.5mol / L MgCl 2 2 times of the solution, the solution can be recycled 8 times, in order to ensure the stability of the hydrolysis rate, the preferred number of solution cycles is 3 times.

[0077] In this embodiment, the presence of a small amount of magnesium sulfate can improve the volume expansion of magnesium hydroxide ...

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Abstract

The invention discloses a device for producing hydrogen from magnesium hydride. The device comprises: a hydrolysis reaction tank; a feeding unit for conveying magnesium hydride into the hydrolysis reaction tank; and a reaction promoting solution conveying unit for conveying a reaction promoting solution into the hydrolysis reaction tank, wherein the reaction promoting solution is a mixed solutionof a MgCl 2 solution and a MgSO 4 solution, and the reaction promoting solution is fed into the hydrolysis reaction tank prior to the magnesium hydride. The invention also discloses a method for producing hydrogen from magnesium hydride. The method comprises the following steps: feeding the mixed solution of the MgCl2 solution and the MgSO4 solution into the hydrolysis reaction tank as the reaction promoting solution; feeding magnesium hydride into the hydrolysis reaction tank, and reacting the magnesium hydride with water in the hydrolysis reaction tank to form hydrogen; and continuously injecting the reaction promoting solution into the hydrolysis reaction tank during the reaction of the magnesium hydride raw material and water. The device and the method, which adopt the mixed solution of the MgCl2 solution and the MgSO4 solution as the reaction promoting solution to promote the progress of the hydrolysis reaction, greatly accelerate the hydrogen production by the hydrolysis reaction.

Description

technical field [0001] The application belongs to the technical field of hydrogen production, and in particular relates to a hydrogen production device and a hydrogen production method using magnesium hydride as a raw material. Background technique [0002] Hydrogen is an ideal fuel, because of its high combustion calorific value, the combustion product is water, zero pollution, light weight, and can be obtained from other renewable resources, it has shown great promise in biology, medicine, industrial production and other fields. Great application value. Compared with traditional gasoline power generation, fuel cell power generation has the advantages of high efficiency, low pollution, low operating noise and easy detection. The combination of hydrogen energy and hydrogen fuel cells can directly convert chemical energy into electrical energy, and is especially suitable for making clean energy products that are lightweight and easy to move and carry. It is an attractive alt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/06
CPCC01B3/065Y02E60/36
Inventor 陈秋荣孙颖迪李贺超周学华
Owner 中国科学院嘉兴轻合金技术工程中心
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