Solar-energy low-temperature thermal power-generation and photovoltaic power-generation combination system

Abstract

The invention relates to a solar-energy low-temperature thermal power-generation and photovoltaic power-generation combination system, comprising a compound parabolic collector system, a heat storage system, an organic rankine cycle power-generation system, a photovoltaic module and a photovoltaic power-supply system, wherein the compound parabolic collector system comprises a high-temperature end compound parabolic collector array and a low-temperature end compound parabolic collector array, and the photovoltaic module is arranged on the upper part of a heat absorber of the compound parabolic collector; the heat storage system comprises a liquid storage tank in which coil pipes are equally arranged, and PCM (phase change material) is filled in the coil pipes; the organic rankine cycle power-generation system comprises an evaporator, a steam turbine, a generator, a heat regenerator, a condenser, two pumps and six valves. The total power-generation efficiency of the combination system is greatly enhanced; and the adoption of the heat storage system avoids the application of additional accumulators and complicated tracking devices, thus reducing cost; and the adoption of two-class evaporator reduces non-reversibility of heat transmission of heat-exchanging fluid and organic work-medium so as to reduce average running temperature, thus being in favor of prolonging service life of photovoltaic cells.

Description

technical field [0001] The invention relates to the fields of thermal power generation and photovoltaic power generation in solar energy utilization. Background technique [0002] At present, the production and processing of photovoltaic cells are mainly based on silicon materials. The solar radiation received by the surface of silicon photovoltaic cells contains different wavelengths, and the energy of photons irradiated by different wavelengths and the penetration depth in photovoltaic cells are different. Silicon photovoltaic cells have a large absorption coefficient for short waves and a small absorption coefficient for long waves. For the sunlight injected into the battery, only those photons with photon energy greater than the forbidden band width can excite electron-hole pairs, while those photons with energy less than the forbidden band width cannot excite electron-hole pairs. right. Under the existing technological conditions, silicon photovoltaic cells can only ...

AI Technical Summary

Problems solved by technology

[0005] In short, the actual power generation efficiency of amorphous silicon products on the market is only about 7.0%. Most of the solar radiation is converted into heat energy, and the traditional use of this part of heat energy is basically limited to heating, hot water, etc. The overall power generation efficiency of solar energy not tall

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