A direct calcium hydroxide thermochemical energy storage system and energy storage method

Abstract

The invention provides a direct calcium hydroxide thermochemical energy storage system and an energy storage method, including a solar heat collection device, a thermochemical energy storage device, a steam Rankine power generation device and an auxiliary device. The thermochemical energy storage system adopted is Ca (OH) 2 / CaO, through the reversible reaction CaO+H 2 O→Ca(OH) 2 Realize the mutual conversion between high-grade thermal energy and chemical energy for heat storage; when the solar radiation is sufficient, the high-temperature water vapor generated by absorbing solar energy makes Ca(OH) 2 When the reaction temperature is reached, an endothermic decomposition reaction occurs, and the received heat is stored in CaO and H in the form of chemical energy 2 O; when heat is required, CaO and H 2 O undergoes a reverse thermochemical reaction, combining CaO and H 2 The chemical energy in O is reversed into thermal energy and released. The invention has the characteristics of high energy storage density, fast reaction speed, high cycle efficiency, stability, safety, environmental friendliness, and low raw material price, and provides a feasible solution for ensuring continuous and efficient operation of solar high-temperature thermal power stations.

Description

Technical field: [0001] The invention belongs to the technical field of energy storage, and in particular relates to a direct calcium hydroxide thermochemical energy storage system and an energy storage method. Background technique: [0002] Thermochemical energy storage uses reversible chemical reactions to store and utilize heat. It has high energy storage density (about 10 times that of sensible heat storage and 5 times that of latent heat storage), low heat loss, and a wide range of energy storage temperatures. It can realize seasonal energy storage without special insulation measures, and provides a promising solution to overcome the intermittent and unstable utilization of solar energy and realize high-temperature and efficient conversion, storage and transmission of solar thermal energy. [0003] Ca(OH) with high energy storage density, fast reaction speed, stability, safety and low raw material price 2 / CaO thermochemical energy storage system is one of the most pro...

AI Technical Summary

Problems solved by technology

[0004] The first purpose of the present invention is to provide a direct calcium hydroxide thermochemical energy storage system for the deficiencies of the prior art, which effectively solves the problem that solar thermal power plants cannot operate continuously;

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