Mixed rare earth-magnesium metal hydride high-temperature heat storage material for solar heat collection power generation

A technology of solar heat collection and mixed rare earth, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of high platform pressure, poor kinetic performance, low working temperature, etc., and achieve fast hydrogen absorption rate and activation performance Improvement and good effect of hydrogen absorption kinetics

Inactive Publication Date: 2015-08-12
UNIV OF SCI & TECH BEIJING
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  • Claims
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Problems solved by technology

The main problems of Mg heat storage materials are low operating temperature, high plateau pressure, and poor kinetic performance.

Method used

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  • Mixed rare earth-magnesium metal hydride high-temperature heat storage material for solar heat collection power generation
  • Mixed rare earth-magnesium metal hydride high-temperature heat storage material for solar heat collection power generation
  • Mixed rare earth-magnesium metal hydride high-temperature heat storage material for solar heat collection power generation

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Experimental program
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Embodiment Construction

[0015] The purity of the raw bulk metals used to prepare the samples is all higher than 99.8%, and two alloys (Mm 1-y A y )Mg x (where A=Ti, x=12, y=0.1) and (Mm 1-m A m )Mg x (wherein A=Mn, x=12, m=0.2). The prepared alloy is crushed by mechanical pulverization, passed through a 200-mesh sieve, and the obtained 200-mesh powder is stored in a glove box.

[0016] Specimens must be conditioned prior to testing. Take by weighing several gram powders and put into reactor, vacuumize after sealing (vacuum degree is higher than 10 -2 Pa), and then filled with hydrogen at a certain pressure, and then evacuated and filled with hydrogen, repeated 2 to 3 times to clean the pipeline. Heating with a precise temperature-controlled electric furnace and strictly controlling the temperature of the reactor. When it reaches 400°C, fill it with pure hydrogen (3-6MPa) at a certain pressure. . The activation treatment of hydrogen absorption and desorption for many times stabilizes the part...

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Abstract

The invention provides a mixed rare earth-magnesium metal hydride high-temperature heat storage material for solar heat collection power generation, which is characterized in that the composition is (Mm[1-y]Ay)Mgx, wherein Mm is cerium-rich mixed rare earth, A is one or two or more of Mn, Ca, Ti and B, 7<=x<=17, and 0<y<=0.2. Compared with the existing pure magnesium heat storage material, the novel mixed rare earth-magnesium heat storage material has the advantages of obviously improved activation property, obviously shorter activation time, excellent hydrogen absorption dynamic property, high hydrogen absorption rate and favorable hydrogen desorption dynamic property, and can ensure free hydrogen absorption and hydrogen desorption in the use process, thereby achieving the goal of energy storage. Compared with the existing pure magnesium heat storage material, the hydrogen absorption platform pressure of the material is lower under the condition of the same temperature, the 400-DEG C maximum hydrogen absorption amount is approximate to the hydrogen absorption amount of MgH2, and the platform hysteresis quality is not high. The mixed rare earth-magnesium metal hydride high-temperature heat storage material has favorable loop reversibility.

Description

technical field [0001] The invention relates to a heat storage material for solar heat collection and power generation, in particular to a novel mixed rare earth-magnesium metal hydride heat storage material. Background technique [0002] Solar thermal power generation is an important clean energy. The sunlight is focused to the heat collector through the reflector, and the heat transfer medium is heated to exchange heat with high-pressure water to generate high-temperature and high-pressure water vapor, which drives the steam turbine to generate electricity. The principle of solar thermal power generation is the same as that of traditional thermal power generation, so it can be integrated with traditional thermal power plants, and the electricity can be directly connected to the grid. Heat storage is an important part of the solar thermal power generation system, which plays an important role in the power station's all-weather continuous and stable power generation, power s...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/02C22C1/04C09K5/16
Inventor 李杨李平曲选辉路新秦明礼章林
Owner UNIV OF SCI & TECH BEIJING
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