High-thermal-conductivity heat-storing nanometer-particle-mixed molten salt and preparation method thereof

Abstract

The invention relates to the heat-storing field of solar thermal power generation, especially to a high-thermal-conductivity heat-storing nanometer-particle-mixed molten salt, and a preparation method thereof. The molten salt consists of a sold heat-storing molten salt, a dispersant and nanometer particles, wherein the dispersant and the nanometer particles disperse uniformly in the heat-storing molten salt and a eutectiform structure is formed, and the nanometer particles coat the surface of the heat-storing molten salt crystal particle. By adding the nanometer particles into the sold heat-storing molten salt, and by utilizing quantum size effect, surface effect, small size effect and the like possessed by the nanometer particles, the thermal physical property of the molten salt as a heat-storing medium has a substantial change. The preparation method is simple in technological process and low in cost, can help to substantially promote heat conductivity and specific heat capacity of the conventional heat-storing molten salt and substantially improve heat stability of the molten salt in a high temperature section, and can help to promote a heat storage capacity and system security of a concentrating solar power generation system and reduce costs of construction and operation of a power station.

Description

Technical field [0001] The invention relates to the field of solar thermal power generation and heat storage, in particular to a mixed nano-particle high thermal conductivity heat storage molten salt and a preparation method thereof. Background technique [0002] Solar thermal power generation technology has received rapid development and extensive attention in recent years. Among them, the concentrating solar power system has attracted more and more attention from all over the world because of its strong controllability and low cost. Concentrated solar power generation systems rely on heat storage equipment to achieve continuous operation. High-temperature molten salt has become the first choice for heat storage media due to its good thermal stability and high heat transfer coefficient. [0003] The existing high-temperature heat storage molten salt has a single type, a rough preparation process, and all have the disadvantages of poor high-temperature working zone stability, low ...

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Problems solved by technology

[0003] The existing high-temperature heat storage molten salt has a single type and rough preparation process. At the same time, there are disadvantages such as poor stability in the high-temperature working area, low specific heat capacity, and large temperature fluctuations.

At present, the upper limit of the temperature of the molten salt put into practical use is 600°C. Once the temperature exceeds the upper limit, the molten salt will become unstable, a slow reaction will occur, and gas will be released, which will increase the melting point of the mixture and even lead to the deterioration of the molten salt. , which may cause serious accidents such as pipe blockage and explosion

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