Fluidization calcium-based thermal-chemical high temperature energy storing/releasing system and working method thereof

Abstract

The invention discloses a fluidization calcium-based thermal-chemical high temperature energy storing / releasing system and a working method thereof. The system is characterized in that the storing and releasing of energy are performed by means of a calcium-based thermal-chemical high-temperature reversible reaction through mutual transformation among solar energy, thermal energy and chemical energy. The system mainly comprises an energy input unit, an energy storing unit and an energy output unit. During storing of energy, calcium hydroxide is subjected to an endothermic decomposition reaction under a fluidization condition, and absorbed energy is stored in calcium oxide as a reaction product in a chemical energy form; during releasing of the energy, the calcium oxide and water vapor are subjected to an exothermic reaction under the fluidization condition, and released heat heats water to generate high-temperature high-pressure steam, so that a steam turbine is driven to generate power. The fluidization calcium-based thermal-chemical high temperature energy storing / releasing system has the characteristics of high unit mass energy-storing density, high energy quality, low energy-storing lost, no pollution and the like, can be modularly combined according to energy-storing capacity, and can be applied to fields such as large-scale solar thermal generation and peak-load regulation.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a thermochemical high-temperature energy storage system that uses calcium-based reversible reactions to store energy from solar energy or power grid valley electricity. Background technique [0002] With the rapid development of the economy, the supply of energy is becoming more and more difficult to meet the demand. In today's world, traditional fossil energy (coal, oil, natural gas, etc.) still dominates. Moreover, the combustion of fossil energy will produce a large amount of greenhouse gases and other toxic and harmful gases and dust, which has brought a series of environmental pollution problems. Therefore, the development and utilization of renewable clean energy has received widespread attention. Solar energy is a widely distributed, clean and environmentally friendly energy. Efficient use of solar energy can alleviate today's energy problems and environmental pol...

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Problems solved by technology

However, its energy storage temperature is only 150°C to 300°C, and the price of metal nickel in its energy storage material is relatively expensive, which may lead to a higher cost of its energy storage system; the application number is 201510116256.3 "New Amino Thermochemical Energy Storage System" Chinese invention patent, which proposes to use the thermochemical reversible reaction of amino groups for energy storage

Ammonia gas undergoes an endothermic decomposition reaction under the action of a catalyst to achieve the purpose of energy storage, which is also a thermochemical energy storage method, but the reaction system requires a catalyst to react, and the ammonia gas in the medium used in the reaction has a strong The irritating smell can burn the eyes, skin, mucous membranes of the respiratory organs, etc., and has a certain degree of danger

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