Thermochemical heat storage system and method

Abstract

The invention relates to the technical field of solar thermal power generation, and discloses a thermochemical heat storage system and method. The thermochemical heat storage system comprises a low-temperature fused salt storage tank, a heat absorber and a thermochemical fused salt storage tank which are connected in sequence and form a circulation loop. The thermochemical fused salt storage tank is provided with a thermochemical reactor, a fused salt circulation pipeline is arranged in the thermochemical reactor, the thermochemical reactor is filled with a thermochemical heat storage module, and the thermochemical heat storage module can be subjected to the dehydration reaction at the high temperature and absorb heat. The thermochemical heat storage system is further provided with an evaporator and a reaction gas pipeline communicating with the evaporator and the thermochemical reactor. Fused salt flowing out of the low-temperature fused salt storage tank is heated in the heat absorber, then enters the thermochemical fused salt storage tank, exchanges heat with the thermochemical heat storage module and is used for the dehydration reaction of the thermochemical heat storage module, heat is stored in the thermochemical heat storage module in the form of chemical energy, the heat storage efficiency is improved, abandoned light is reduced, and the utilization rate of solar energy resources is increased.

Description

technical field [0001] The invention relates to the technical field of solar thermal power generation, in particular to a thermochemical heat storage system and a heat storage method. Background technique [0002] Solar energy is the most abundant, clean, and widely available renewable energy in the world. Solar power generation technology is an effective means to alleviate the energy crisis and has broad application prospects. According to the different ways of solar power generation, solar power generation technology is mainly divided into photothermal power generation and photovoltaic power generation. No pollution and other advantages, so large-scale research and development and application. [0003] In the industry, photovoltaic power generation technology has matured and achieved large-scale application. The installed capacity of photovoltaic power generation far exceeds that of solar thermal power generation. From the current data, the cost of solar thermal power gen...

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Problems solved by technology

When the solar radiation is strongest at noon, the efficiency of photovoltaic power generation is the highest. Since solar thermal power generation needs to undertake the task of peak regulation, during this period, the photovoltaic power plant runs at full capacity while the solar thermal power plant stops generating power, which is the so-called "light abandonment". Cause a lot of waste of solar energy resources

Under such a policy background, solar thermal power plants store heat when the sun is strongest at noon, and convert solar energy into thermal energy and store it in molten salt. Some molten salt tower solar power plants that were originally designed have appeared. The storage tank is too small. All the molten salt absorbs solar radiation and the temperature rises and is stored in the high-temperature molten salt tank. There is no molten salt flowing through the heat absorber to absorb heat. In order to avoid the overheating of the heat absorber, it is necessary to Other places that reflect sunlight through heliostats not only waste a lot of solar energy resources, but also cause harm to the surrounding environment

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