Double-stage heat storage trough type solar thermal power generation system

Abstract

The invention discloses a double-stage heat storage trough type solar thermal power generation system. The system comprises a double-stage trough type solar heat collection field, a double-stage heat storage sub-system and a power generation sub-system. The double-stage trough type solar heat collection field comprises a high-temperature heat collection field and a low-temperature heat collection field and is used for receiving and collecting solar radiation energy. The high-temperature heat collection field is used for converting the collected solar radiation energy into heat of high-temperature heat conducting oil. The low-temperature heat collection field is used for converting the solar radiation energy into heat of low-temperature heat conducting oil. The double-stage heat storage sub-system comprises a high-temperature heat accumulator and a low-temperature heat accumulator. The high-temperature heat accumulator is used for storing the high-temperature heat conducting oil output by the high-temperature heat collection field. The low-temperature heat accumulator is used for storing the low-temperature heat conducting oil output by the low-temperature heat collection field. The power generation sub-system is used for converting the heat of the heat conducting oil into steam, converting the steam into electric energy and outputting the electric energy. By using the system disclosed by the invention, a problem of reduction of heat collecting efficiency resulted from high average heat absorption temperature of a mirror field is resolved; furthermore, problems of high high-temperature resistance performance of the mirror field to the conducting oil, high investment of the conducting oil and high power generation cost are resolved.

Description

technical field [0001] The invention relates to the technical field of solar thermal power generation, in particular to a two-stage heat storage trough solar thermal power generation system. Background technique [0002] Solar thermal power generation technology has received high attention in the world and has developed rapidly. Solar thermal power generation technology is mainly divided into three types: trough type, tower type and dish type. The trough solar thermal power generation system has experience in commercial operation in the SEGS power station in the United States and the AndaSol power station in Spain. Compared with other technologies, the trough solar thermal power generation system technology is relatively mature and has the highest degree of commercialization. [0003] The main obstacle of the trough solar thermal power generation system is that the temperature of the heat-collecting working medium is not high, and the thermal efficiency of the power generat...

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Problems solved by technology

[0008] In view of this, the main purpose of the present invention is to provide a two-stage heat storage trough solar thermal power generation system to solve the problem of reduced heat collection efficiency caused by the high average heat absorption temperature of the mirror field, and to solve the problem of the mirror field being resistant to heat transfer oil. High temperature performance, large investment in heat transfer oil and high cost of power generation

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