Gradient energy storage and energy release system and method based on reversible chemical reaction

Abstract

The invention discloses a gradient energy storage and energy release system and a method based on a reversible chemical reaction. The system comprises a solar tower, a heat absorber, a heat absorbing working medium capable of resisting high temperature, a high-temperature reversible thermal chemical reaction system, a medium-temperature reversible thermal chemical reaction system, a low-temperature reversible thermal chemical reaction system, a water working medium and a generator set. The system realizes storage of solar energy and reverse heat release through serially connecting the high-temperature reversible thermal chemical reaction system, the medium-temperature reversible thermal chemical reaction system and the low-temperature reversible thermal chemical reaction system, and has the characteristics of high energy storage density, full heat energy absorption and capability of preserving energy for a long time. The system provides a new method to a solar thermal power generation energy storage mode, and has important significance on solar heat utilization and solar-driven chemical reactions.

Description

technical field [0001] The invention belongs to the field of solar heat utilization and thermochemistry, and in particular relates to a cascaded energy storage and energy release system and method based on reversible chemical reactions. Background technique [0002] In recent years, tower-type solar thermal power generation technology and corresponding industries have entered a rapid development path. With the completion of PS10 / PS20 and Gemasolar in Spain, Ivanpah in the United States, Delingha in my country and other large-scale solar thermal power stations and the successful realization of grid-connected operation, the commercialization of tower solar thermal power generation technology has entered a new height. However, although solar energy has the advantages of wide distribution, huge resources, and inexhaustibility, it is also discontinuous. Therefore, in order to realize continuous power generation of solar thermal power generation systems, an energy storage system m...

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Problems solved by technology

These two energy storage methods mainly have two disadvantages: first, the energy storage density is relatively low, generally less than 0.1kWh / kg, especially the sensible heat storage method, the energy storage density is even lower than 0.03kWh / kg, which leads to The volume of the energy system is quite large, which not only takes up space but also consumes cost; second, it is difficult to store energy for a long time, because the energy is stored in the form of heat energy, and the temperature of the heat storage system is higher than that of the external environment, and the heat energy will slowly transfer to the environment over time. In the external environment, a large amount of energy of the heat storage system will be lost over time

[0004] There is still a problem to be paid attention to when using chemical energy storage to store solar energy, that is, the chemical reaction needs to be maintained in a specific temperature range to fully proceed, and this temperature range is often small, which makes the high-temperature heat-absorbing working fluid coming out of the heat absorber It is sent back to the heat absorber without being sufficiently cooled. On the one hand, the heat cannot be fully transferred to the energy storage system, and on the other hand, the efficiency of the heat absorber is also reduced.

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