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

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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 improv

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

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Example Embodiment

[0040] Example 1

[0041] (1) Weigh 0.4250g NaNO 3 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.) and 0.5055g KNO 3 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.) was dissolved in 50ml filled with deionized water in a beaker, to which was added 5.8320g Mg (OH) 2 (Super pure ≥99%, Sinopharm Chemical Reagent Co., Ltd.) and 0.6008g nanopowder SiO 2 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.), was stirred 20min under a heated environment at 60 ℃ ultrasonic mixer.

[0042] (2) The above solution was mixed in a beaker placed on a magnetic stirrer and heated to 100 rpm rotation speed, until the solution was evaporated to dryness. The material was evaporated to dryness in a vacuum oven, and dried at 80 deg.] C environment for 12 hours.

[0043] (3) Application of high-speed planetary mill (QS92, Nanjing Nanda Instrument) of the dried material was dry milled for 8 hours. Using only a spherical graphite pot (250ml / pot), in order to maintain balanced operat...

Example Embodiment

[0046] Example 2

[0047] (1) Weigh 0.8499g NaNO 3 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.) was dissolved in 50ml filled with deionized water in a beaker, to which was added 5.8320g Mg (OH) 2 (Super pure ≥99%, Sinopharm Chemical Reagent Co., Ltd.) and 0.6008g nanopowder SiO 2 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.), was stirred 20min under a heated environment at 60 ℃ ultrasonic mixer.

[0048] (2) The above solution was mixed in a beaker placed on a magnetic stirrer and heated to 100 rpm rotation speed, until the solution was evaporated to dryness; the material was evaporated to dryness in a vacuum oven, and dried at 80 deg.] C environment 12 Hour.

[0049] (3) Application of high-speed planetary mill (QS92, Nanjing Nanda Instrument) of the dried material dry milling for 8 hours using only a spherical graphite pot (250ml / pot), in order to maintain balanced operating state, the other three tanks was placed in the same amount of the reference mate...

Example Embodiment

[0052] Example 3

[0053] (1) Weigh 0.2896g LiNO 3 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.) and 0.5864g KNO 3 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.) was dissolved in 50ml filled with deionized water in a beaker, to which was added 5.8320g Mg (OH) 2 (Super pure ≥99%, Sinopharm Chemical Reagent Co., Ltd.) and 0.6008g nanopowder SiO 2 (Analytical grade, Sinopharm Chemical Reagent Co., Ltd.), was stirred 20min under a heated environment at 60 ℃ ultrasonic mixer.

[0054] (2) The above solution was mixed in a beaker placed on a magnetic stirrer and heated to 100 rpm rotation speed, until the solution was evaporated to dryness. The material was evaporated to dryness in a vacuum oven, and dried at 80 deg.] C environment for 12 hours.

[0055] (3) Application of high-speed planetary mill (QS92, Nanjing Nanda Instrument) of the dried material was dry milled for 8 hours. Using only a spherical graphite pot (250ml / pot), in order to maintain balanced operat...

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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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