Porous material matrix and composite phase-change heat storage material and preparation methods thereof

Abstract

The invention provides a preparation method of a porous material matrix. The preparation method comprises the following steps: mixing a weighed calcium-containing raw material and a silicon-containing raw material at the mole ratio of Ca to Si of 1:(0.4-1), adding 20-40-times water based on the total weight of the raw materials, stirring and keeping the temperature of 180-320 DEG C for 4-12 hours, and obtaining porous material slurry; and adding 0%-5% of nano-metal powder after the slurry is cooled, drying and molding to obtain the porous material matrix. The preparation method of a composite phase-change heat storage material comprises the following steps: dipping the obtained porous material matrix into a fully fused inorganic salt phase-change material so that the phase-change material is completely infiltrated into a pore path of the porous material matrix; and blowing out for cooling, and then desalting the discharged sample to finally obtain the composite phase-change heat storage material. The obtained matrix material has the advantages of good infiltration property and excellent high-temperature chemical stability relative to inorganic salt; and the obtained composite phase-change heat storage material has the advantages of high heat storage density, good heat-conducting property and cheap raw material.

Description

technical field [0001] The invention relates to the technical field of inorganic materials and environmental protection and energy saving, in particular to a porous material matrix, a composite phase-change thermal storage material for heat preservation prepared by using the matrix, and a preparation method. Background technique [0002] Heat storage technology can solve the contradiction between thermal energy supply and demand mismatch, and is an important technology to improve energy utilization efficiency and protect the environment. It has broad application prospects in the fields of solar energy utilization, "peak shaving and valley filling" of electric power, industrial waste heat and waste heat recovery, and energy saving of building heating and air conditioning. In recent years, it has become a research hotspot worldwide. [0003] Combining phase change materials with good corrosion resistance matrix materials to obtain composite phase change heat storage materials ...

AI Technical Summary

Problems solved by technology

[0004] At present, according to the matrix classification of high-temperature composite phase change heat storage materials, it can be divided into two categories: ceramic base and metal base: the metal base currently available mainly includes high-temperature alloys such as cobalt base, nickel base, and niobium base, such as the one used in the patent CN101560377A The phase-change thermal storage material prepared with nickel foam as the matrix has a phase-change material content of 80-95%, which has good thermal storage performance, but its preparation process is complex and requires high reaction conditions: a vacuum heating furnace is used for the compounding process , the composite time is as long as 2-3 hours; the metal matrix used is not only rare and expensive, but also difficult to recycle;

[0005] Patent CN1803965A uses a ceramic matrix to prepare an inorganic salt / ceramic matrix composite heat storage material, which has the characteristics of simple process, but because the matrix is ​​ceramic, it needs to be calcined at a higher temperature (1250 ° C), which consumes a lot of energy. The porosity of the matrix is ​​low (about 46%), the content of inorganic salt phase change material is low (45-55%), and the heat storage performance is poor

Images