Medium temperature multi-element phase-change material with high thermal stability and preparation method thereof

Abstract

The invention relates to a medium temperature multi-element phase-change material with high thermal stability, a preparation method thereof and an application. The multi-element phase-change material with high thermal stability comprises 65-70% of KNO3, 15-20% of LiNO3, 12-16% of Ca(NO3)2 and 0.1-1.0% of CsNO3. The preparation method for the multi-element phase-change material comprises the steps of heating, mixing, stirring, exposing under high temperature environment, and the like. The multi-element phase-change material can be used as a medium temperature heat-storing energy-storing material for a solar power plant. The invention mainly solves the technical problems, such as, low thermal stability, for preparing the medium temperature heat-storing phase-change material at present.

Description

technical field [0001] The invention relates to a high thermal stability medium-temperature multi-component phase-change material and a preparation method thereof. The novel multi-component phase-change material exhibits excellent thermal stability, so that its application in a medium-temperature heat storage system has great potential. Background technique [0002] With the seriousness of the global energy crisis, the increase of greenhouse gas emissions and the emergence of increasingly serious environmental problems, solar energy is currently the most important and stable source of energy, and will play an increasingly important role in the future energy system. The inherent discontinuity and instability of solar energy have always been the core issues that plague people to improve their utilization efficiency. The successful utilization of solar thermal power systems largely requires an efficient and reliable heat storage method. [0003] One of the current efficient he...

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Problems solved by technology

[0005] The main purpose of the present invention is to develop a new type of high thermal stability medium temperature multi-component phase change material and its preparation method, through the KNO 3 -LiNO 3 -Ca(NO 3 ) 2 A certain amount of CsNO was added to the ternary system 3 Improve the long-term high-temperature thermal stability of phase change materials, and improve their defects such as low phase transition temperature

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