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Chemical heat storage and release material with high heat storage and release density and preparation method thereof

A technology for storing and releasing heat and density, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc. It can solve the problems of reducing the specific surface area of ​​solid particles, slow reaction rate, and zero exothermic density, so as to improve the exothermic reaction rate. , The effect of improved kinetic performance and high storage/release heat density

Active Publication Date: 2020-11-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among many heat storage and release working medium pairs, MgCO is used in the medium temperature region (573-673K) to realize heat storage and release 3 / MgO material is not only cheap and easy to obtain, but also has an actual heat storage density as high as 788.9kJ / kg-MgCO 3 However, its conversion rate in the exothermic reaction process is less than 2%, the exothermic density is almost zero, and the reaction rate is slow. At the same time, the reaction rate, conversion rate and heat storage density of the heat storage process need to be improved to meet the energy supply End-to-end high-efficiency heat storage needs
In addition, MgCO 3 / MgO materials also have particle agglomeration, wall adhesion and even agglomeration during the heat storage / release process, which significantly reduces the specific surface area of ​​solid particles and even blocks the porous structure on its surface, thereby inhibiting CO. 2 When the gas reacts with solid MgO powder, the diffusion ability in the product layer, the existence of the above problems seriously restricts the MgCO 3 / Practical application of MgO

Method used

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  • Chemical heat storage and release material with high heat storage and release density and preparation method thereof
  • Chemical heat storage and release material with high heat storage and release density and preparation method thereof
  • Chemical heat storage and release material with high heat storage and release density and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Weigh 0.4250g NaNO 3 (analytical pure, Sinopharm Chemical Reagent Co., Ltd.) and 0.5055g KNO 3 (analytical pure, Sinopharm Group Chemical Reagent Co., Ltd.) was dissolved in a beaker filled with 50ml deionized water, and 5.8320g Mg(OH) was added thereto 2 (super pure ≥ 99%, Sinopharm Chemical Reagent Co., Ltd.) and 0.6008g nanometer powder SiO 2 (analytical grade, Sinopharm Chemical Reagent Co., Ltd.), and stirred in an ultrasonic stirrer for 20 min in a water bath heating environment at 60°C.

[0042] (2) Place the above-mentioned beaker containing the mixed solution on a magnetic stirrer and heat it at a speed of 100 rpm until the solution evaporates to dryness. The evaporated material was placed in a vacuum oven and dried at 80° C. for 12 hours.

[0043] (3) The dried material was dry-milled for 8 hours with a planetary high-speed ball mill (QS92, Nanjing Nanda Instrument Factory). Only use 1 spherical graphite tank (250ml / can), in order to maintain the balan...

Embodiment 2

[0047] (1) Weigh 0.8499g NaNO 3 (analytical pure, Sinopharm Group Chemical Reagent Co., Ltd.) was dissolved in a beaker filled with 50ml deionized water, and 5.8320g Mg(OH) was added thereto 2 (super pure ≥ 99%, Sinopharm Chemical Reagent Co., Ltd.) and 0.6008g nanometer powder SiO 2 (analytical grade, Sinopharm Chemical Reagent Co., Ltd.), and stirred in an ultrasonic stirrer for 20 min in a water bath heating environment at 60°C.

[0048] (2) Place the above-mentioned beaker containing the mixed solution on a magnetic stirrer and heat it at a speed of 100 rpm until the solution evaporates to dryness; place the evaporated material in a vacuum drying oven and dry it at 80°C for 12 Hour.

[0049] (3) Use a planetary high-speed ball mill (QS92, Nanjing Nanda Instrument Factory) to dry-mill the dried material for 8 hours, using only one spherical graphite tank (250ml / can), in order to keep the running state balanced, the other three tanks The same amount of reference material ...

Embodiment 3

[0053] (1) Weigh 0.2896g LiNO 3 (analytical pure, Sinopharm Chemical Reagent Co., Ltd.) and 0.5864g KNO 3 (analytical pure, Sinopharm Group Chemical Reagent Co., Ltd.) was dissolved in a beaker filled with 50ml deionized water, and 5.8320g Mg(OH) was added thereto 2 (super pure ≥ 99%, Sinopharm Chemical Reagent Co., Ltd.) and 0.6008g nanometer powder SiO 2 (analytical grade, Sinopharm Chemical Reagent Co., Ltd.), and stirred in an ultrasonic stirrer for 20 min in a water bath heating environment at 60°C.

[0054] (2) Place the above-mentioned beaker containing the mixed solution on a magnetic stirrer and heat it at a speed of 100 rpm until the solution evaporates to dryness. The evaporated material was placed in a vacuum oven and dried at 80° C. for 12 hours.

[0055] (3) The dried material was dry-milled for 8 hours with a planetary high-speed ball mill (QS92, Nanjing Nanda Instrument Factory). Only use 1 spherical graphite tank (250ml / can), in order to maintain the balan...

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Abstract

The invention discloses a chemical heat storage and release material with high heat storage and release density and a preparation method thereof, the chemical heat storage and release material with high heat storage and release density comprises a heat storage and release precursor material, a modifier and a dispersant; wherein the heat storage and release precursor material is a magnesium-based compound of which the product after high-temperature calcination is only magnesium oxide; wherein the modifier is unitary, binary or ternary alkali metal nitrate with a fixed melting point. According to the invention, the reaction rate and the exothermic density of the exothermic material can be greatly improved; the heat storage reaction rate and the heat storage density are effectively improved,meanwhile, the agglomeration phenomenon of heat storage and release materials is reduced, the fluidity of solid powder in a reaction system and the diffusivity of reaction gas in the reaction system are enhanced, and the method has important significance in achieving medium-temperature industrial waste heat and solar heat storage and meeting the requirement of users for heat.

Description

technical field [0001] The invention belongs to the technical field of chemical heat storage materials, and in particular relates to a chemical heat storage and release material with high heat storage and release density and a preparation method thereof. Background technique [0002] With the depletion of traditional fossil fuels and the emergence of pollutant emissions, the world is facing the severe test of the climate environment and even the safety of human survival. The development of renewable energy is a major demand for the implementation of energy conservation and emission reduction strategies, but renewable energy is affected by weather changes. The impact is strong. Heat storage technology can effectively solve the problem of curtailment of wind and light caused by the discontinuity of renewable energy. [0003] Thermochemical heat storage technology has the advantages of high heat storage density, wide application temperature range, seasonal heat storage and lon...

Claims

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Application Information

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IPC IPC(8): C09K5/14
CPCC09K5/14
Inventor 赵长颖徐云轩闫君
Owner SHANGHAI JIAO TONG UNIV
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