Method for improving strength of fused salt phase-change heat storage material by utilizing phenolic resin

Abstract

The invention discloses a method for improving the strength of a fused salt phase-change heat storage material by utilizing phenolic resin, and belongs to the field of phase change heat storage materials. Based on a preparation method of the stable molten salt phase-change material, a ceramic material is used as a matrix, phenolic resin is used as a binder, a stable structure is provided through the ceramic matrix, the phenolic resin provides formability, and the molten salt phase-change heat storage body with excellent mechanical properties can be prepared by adding a carbon structure generated after the high-temperature part of the phenolic resin is cracked. The preparation method disclosed by the invention is simple, low in cost and capable of realizing large-scale production, solves the common problem of insufficient mechanical properties of the fused salt phase-change heat storage body at present, and has important significance for expanding the application range of the fused saltphase-change heat storage material.

Description

technical field [0001] The invention belongs to the field of phase change heat storage materials, in particular to a method for improving the strength of molten salt phase change heat storage materials by using phenolic resin. Background technique [0002] As a national strategic emerging industry, energy storage technology is an important part of energy conversion and utilization technology. Choosing a suitable energy storage technology route is of great significance for improving the utilization efficiency of renewable energy, enhancing the peak-shaving capability of thermal power generation, and alleviating power grid dispatching. It is of great significance, and its large-scale application will have a major impact on energy transformation, power grid pattern, and power supply structure. Heat storage material is the core and key of heat storage technology. It collects and stores the excess energy that is temporarily unused for a period of time or in a certain space, and r...

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Problems solved by technology

[0005] The present invention aims at the problem of insufficient mechanical properties of ceramic base (magnesia, diatomite) heat storage materials composed of molten salt phase change heat storage materials (nitrates, carbonates and multi-element eutectic salts), and uses phenolic resin bonding The original structure is more stable, and at the same time, the decomposition of phenolic resin during high temperature treatment can provide a carbon structure that makes the ceramic matrix more stable, making the mechanical properties of the phase change heat storage body more excellent, and the phenolic resin and its decomposed The carbon structure has a good thermal conductivity and has a low impact on the heat storage performance. Finally, a phase change heat storage body with excellent mechanical properties and heat storage performance can be prepared.

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