Direct type calcium hydroxide thermochemical energy storage system and method

Abstract

The invention provides a direct type calcium hydroxide thermochemical energy storage system and method. The direct type calcium hydroxide thermochemical energy storage system comprises a solar heat collection device, a thermochemical energy storage device, a steam Rankine power generation device and an auxiliary device, the adopted thermochemical energy storage system is Ca (OH) 2 / CaO, and mutual conversion between high-grade heat energy and chemical energy is achieved through a reversible reaction CaO + H2O generate Ca (OH) 2 for heat storage; when solar irradiation is sufficient, Ca (OH) 2 reaches the reaction temperature through high-temperature water vapor generated by absorbing solar energy, an endothermic decomposition reaction is carried out, and the received heat is stored in CaO and H2O in the form of chemical energy; and when heat is needed, CaO and H2O are subjected to a reverse thermal chemical reaction, and chemical energy in CaO and H2O is reversed into heat energy and released. The system has the characteristics of high energy storage density, high reaction speed, high cycle efficiency, stability, safety, environmental friendliness, low raw material price and the like, and a feasible scheme is provided for ensuring continuous and efficient operation of a solar high-temperature thermal power station.

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;

Images