Photovoltaic and photo-thermal chemical combination solar energy comprehensive utilization device and system

Abstract

The invention provides a photovoltaic and photo-thermal chemical combination solar energy comprehensive utilization device and system. According to the principle of gradient utilization of cycling energy, sunlight energy is firstly utilized through a photovoltaic system, and the residual heat of the photovoltaic system is converted into high-grade (fuel) chemical energy through absorbing by a chemical reaction. Compared with the way of directly utilizing the residual heat of a solar photovoltaic battery in a physical way, the method for coupling thermal physics and thermal chemistry has the advantages that the power capability of solar energy is fully explored, the second law of thermodynamics efficiency of solar energy utilization can be greatly increased, and the electric energy output of the system can be more stabilized.

Description

technical field [0001] The invention relates to the technical field of new energy (renewable energy), in particular to a solar energy comprehensive utilization device and system combining photovoltaic and photothermal chemistry. Background technique [0002] Solar photovoltaic utilization technology converts part of the solar energy directly into electrical energy through the photovoltaic effect of solar photovoltaic cells, and the remaining part of the solar energy is converted into heat energy. At present, the power generation efficiency of mass-produced solar photovoltaic cells is about 15%-20%, which means that more than 80% of solar energy will be directly converted into heat energy. There are two ways to deal with this heat energy: directly dissipate it to the environment in the form of heat dissipation; and utilize it through heat recovery. [0003] The recovered heat energy is mainly used in physical ways such as heating, cooling, driving a heat engine to generate e...

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Problems solved by technology

[0008] In the process of realizing the present invention, the applicant found that the above-mentioned prior art has the following problems in the process of converting solar energy into electrical energy respectively: (1) The low-grade thermal energy with a lower temperature generated by the solar photovoltaic utilization system is directly lost to the environment It will cause a large energy loss, but the benefits obtained by direct physical utilization are small; (2) The solar thermochemical utilization technology needs to convert high-grade solar energy into low-grade heat energy for utilization, and this process will cause Larger loss of available energy, that is, solar energy does not fully exploit its work potential from the source before it becomes heat; (3) Due to the volatility of solar energy, the electrical energy generated by the solar photovoltaic utilization system is unstable, which will impact the grid, or Reduce the use comfort of direct users; the solar thermal utilization system will also have low efficiency due to solar fluctuations that deviate from the design conditions; Large-scale power storage technology is far from mature, and photovoltaic power generation alone is difficult to meet the power supply demand at night

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