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Magnesium-modified globular calcium-based thermochemical energy storage material and preparation method thereof

A technology of energy storage materials and small balls, which is applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of high price, complicated production methods, and difficult access to raw materials, so as to achieve widespread existence in nature and easy large-scale acquisition , Energy storage performance and efficient effect

Active Publication Date: 2020-01-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the modification to change the structure of CaO, it is mainly to add organic carbon sources, but some organic carbon sources are expensive and difficult to produce on a large scale; for the preparation of CaO mixtures to improve their anti-sintering ability, the main method is to add stabilizer Al 2 o 3 , MgO; but some production methods are complicated, and the raw materials are not easy to obtain, and the properties of the modified samples need to be improved; most of the modification methods do not consider industrial applications, and the produced samples are all powders, which cannot be applied to CSP in process

Method used

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  • Magnesium-modified globular calcium-based thermochemical energy storage material and preparation method thereof
  • Magnesium-modified globular calcium-based thermochemical energy storage material and preparation method thereof
  • Magnesium-modified globular calcium-based thermochemical energy storage material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] The difference between the preparation steps of this Example 1 and Comparative Example 1 is: cooling the carbonized black solid to room temperature, adding an appropriate amount of deionized water, placing it in an extruder, extruding a strip-shaped solid, and then placing the strip-shaped solid Spherical particles were made in a rolling ball machine; then the spherical particles were put into a muffle furnace and calcined at a constant temperature in an air atmosphere at a calcination temperature of 800°C, a heating rate of 10°C / min, and a calcination time of 2h.

[0042] The energy storage material obtained in the embodiment was observed under a scanning electron microscope, and the results were as follows: figure 2 As shown, it can be observed that although the energy storage material prepared in Example 1 is extruded into balls, it maintains a more stable macroporous skeleton structure. Obtain the crystal phase composition of the sample in the 2θ range of 10-90 ° b...

Embodiment 2

[0056] Weigh 3g calcium nitrate (Ca(NO 3 ) 2 ) and 0.3619g magnesium nitrate (Mg(NO 3 ) 2 ) (that is, the molar ratio of calcium nitrate and magnesium nitrate is 9:1), placed in an agate mortar, fully ground and mixed; the uniformly mixed calcium nitrate and magnesium nitrate mixture is put into a corundum crucible, placed in a muffle furnace, Calcination in air atmosphere, the calcination temperature is 900°C, the heating rate is 20°C / min, and the calcination time is 1h, to obtain a white solid powder, which is taken out and cooled to room temperature.

[0057] Weigh 2.0763g citric acid (i.e. calcium oxide, magnesium oxide, citric acid molar ratio CaO:MgO:CA=9:1:7), add in the white solid powder, fully mix, then place the blended mixture In a tube furnace, constant temperature carbonization was carried out under a nitrogen atmosphere, the carbonization temperature was 500°C, the heating rate was 20°C / min, and the carbonization time was 2h to obtain a fluffy black solid wit...

Embodiment 3

[0060] Weigh 3g of calcium acetate (Ca(CH 3 COO) 2 ) and 0.1917g magnesium carbonate (MgCO 3 ) (that is, the molar ratio of calcium acetate and magnesium carbonate is 9:1), placed in an agate mortar, fully ground and mixed; put the uniformly mixed calcium nitrate and magnesium nitrate mixture into a corundum crucible, placed in a muffle furnace, Calcination in air atmosphere, the calcination temperature is 850°C, the heating rate is 10°C / min, and the calcination time is 2h, to obtain a white solid powder, which is taken out and cooled to room temperature.

[0061] Weigh 2.7831g of citric acid (i.e. calcium oxide, magnesium oxide, citric acid molar ratio CaO: MgO: CA=9:1:7), add in the white solid powder, fully mix, then place the blended mixture In a tube furnace, constant temperature carbonization was carried out under a nitrogen atmosphere, the carbonization temperature was 400°C, the heating rate was 10°C / min, and the carbonization time was 1h to obtain a fluffy black sol...

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Abstract

The invention discloses a magnesium-modified globular calcium-based thermochemical energy storage material and a preparation method thereof. The preparation method comprises the following steps: weighing a calcium source precursor and a stabilizer magnesium source precursor according to a certain ratio, grinding for uniform mixing, and calcining the mixture in an air atmosphere to obtain a calciumoxide and magnesium oxide mixed powder; adding an organic carbon source, performing mixing for uniformity, and carbonizing the obtained material at a constant temperature in an inert atmosphere to obtain a fluffy black solid with a carbon template; cooling the carbonized black solid to room temperature, adding a proper amount of deionized water, placing the solid and the water in an extruder, extruding out a strip-shaped solid, and processing the strip-shaped solid in a ball rolling machine to prepare spherical particles; and calcining the spherical particles in the air atmosphere to obtain the magnesium-modified globular calcium-based thermochemical energy storage material. The thermochemical energy storage material prepared in the invention has the advantages of long-term stability andefficient energy storage capacity, and the preparation method has the advantages of simplicity, easiness in operation, nontoxicity and easy large-scale obtaining of the raw materials, and strong practicability.

Description

technical field [0001] The invention relates to the field of thermochemical energy storage materials, in particular to a magnesium-modified small spherical calcium-based thermochemical energy storage material and a preparation method thereof. Background technique [0002] In today's society, coal-fired power plants still occupy the main position of power generation. Coal is a non-renewable energy source, its storage capacity is decreasing rapidly, and its combustion also brings many environmental problems, including global warming caused by greenhouse gas emissions. In order to solve the environmental problems caused by coal combustion, many scholars have developed new power generation technologies (solar power generation, wind power generation, geothermal power generation) to replace traditional coal-fired power plants. However, the current lack of large-scale, low-cost, high-efficiency, and environmentally friendly energy storage technologies hinders the process of replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 王珂谷丰赵鹏飞赵有为洪杰朱瑞柯杨川江张博禹张鹏程于瑞红
Owner CHINA UNIV OF MINING & TECH
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