Large-capacity combined solar thermochemical cascade high-efficiency heat storage device and its application

Abstract

The invention relates to a high-capacity combination type solar thermochemistry cascaded heat storage device and solar energy application. The high-capacity combination type solar thermochemistry cascaded heat storage device comprises a solar heat collector, a solid-gas chemical reactor, a refrigerant liquid storage device and a cooling towel. Three heat storage slat absorbing agents are filled inside the solid-gas chemical reactor. Under the same working pressure, desorption equilibrium temperatures of the three heat storage salt absorbing agents decrease gradually in the flowing direction of heat exchanging fluid and the three heat storage salt absorbing agents are distributed in a cascaded mode. Thermochemistry absorption heat storage is utilized, and multiple reaction salts of different temperature zones are adopted so that the defect that in an existing solar energy thermochemistry heat storage device, reactants cannot conduct thermal decomposition reaction at a certain moment due to the fact that the temperature of collected solar heat energy is low is overcome. Therefore, a novel solar energy thermochemistry cascaded heat storage technology can reduce the influences of solar energy time volatility and can be better matched with solar heat energy, and high-efficiency heat storage of the solar heat energy can be realized through the cascaded combination of the heat storage reaction slats of different temperature zones.

Description

technical field [0001] The invention relates to a device in the technical field of solar thermal energy storage, in particular to a large-capacity combined solar thermochemical cascade high-efficiency heat storage device and its application. Background technique [0002] Solar energy is a renewable energy with great potential for development. The development and utilization of solar energy is one of the important options for coping with energy shortage, climate change and energy conservation and emission reduction. As we all know, solar energy has the characteristics of intermittency, dispersion and instability. Therefore, the implementation of high-efficiency heat storage technology is a necessary means to solve the contradiction between its intermittency, instability and time difference between heat supply and demand. In the utilization of solar energy, the thermal utilization of solar energy is the closest to the practical application stage. Although various thermal energ...

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Problems solved by technology

If the solar radiation is strong or weak in the same day, it will happen that the heat energy collected at some time is not enough to heat the reactants to a specific temperature, so that the decomposition reaction of heat storage cannot be carried out, which will inevitably lead to a great reduction in heat storage efficiency

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