Trough-dish combined solar thermal power generation system with fixed focus

Abstract

The invention discloses a trough-dish combined solar thermal power generation system with a fixed focus and relates to a solar thermal power generation technology. The system comprises a trough type heat-collecting and heat-storing subsystem, a dish type heat-collecting and heat-storing subsystem and a power generation subsystem, wherein the trough type heat-collecting and heat-storing subsystem and the dish type heat-collecting and heat-storing subsystem are separately connected with the power generation subsystem; and the low temperature heat exchanger of the trough type heat-collecting and heat-storing subsystem is connected with the high temperature heat exchanger of the dish type heat-collecting and heat-storing subsystem. A parabolic dish reflecting mirror contains one dish or two dishes which can perform single-spindle automatic tracking and the focus, namely the receiver is fixed, thus facilitating the heating and heat insulation of large flow high temperature fluid. The invention adopts a trough type solar field with low investment cost to heat the low temperature section of the working medium and a dish type solar field to heat the high temperature section of the working medium, thus reducing the investment of the electric power plant under the premise of ensuring high generating efficiency.

Description

technical field [0001] The invention relates to a solar thermal power generation technology, in particular to a solar thermal power generation system with a fixed-focus trough-dish combination. Background technique [0002] According to the position of the focusing mirror and the focal point and the energy conversion method, the current solar thermal power generation technology that can realize large-scale power generation can be divided into three types: trough system, dish system and tower system. [0003] 1. Trough solar thermal power generation system [0004] The full name of the trough solar thermal power generation system is the trough parabolic mirror solar thermal power generation system. The parabolic trough mirror tracks the sun one-dimensionally. Its concentration ratio is between 40 and 80. The heat collection temperature generally does not exceed 400°C. The heat collection focal line is fixed, so it is easy to build a large-scale power generation system. The ...

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Problems solved by technology

[0014] The purpose of the present invention is to provide a trough-disk combined solar thermal power generation system with a fixed focus to overcome the defects of low heat collection temperature and low power generation efficiency of a single trough-type power generation system, high investment and difficulty in large-scale single-disk power generation system, Give full play to the advantages of low investment cost of the trough power generation system and high power generation efficiency of the disc system, realize cascade heating of the heat transfer medium, and reduce the investment and floor area of ​​the power generation system

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