Solar steam direct power generation system with heat storage function

Abstract

The invention discloses a solar steam direct power generation system with a heat storage function. The solar steam direct power generation system comprises a heat collection subsystem, a heat storage subsystem and a power generation subsystem. Under irradiation conditions in the daytime, high-temperature and high-pressure saturated steam enters the inner pipe side of a sleeve type line focusing solar heat collector, and low-temperature molten salt enters the sleeve side. Focusing solar energy firstly heats the molten salt, and the steam is heated to an overheated state after the temperature rise of the molten salt. Part of the overheated steam enters a high-pressure storage tank for heat storage, and the rest of overheated steam enters the power generation subsystem for power generation. Meanwhile, the molten salt enters a high-temperature molten salt tank for heat storage. Under irradiation-free conditions in the nighttime, the molten salt in the high-temperature molten salt tank enters a low-temperature molten salt tank after heat release by an overheater; the high-pressure saturated steam flows out from the high-pressure storage tank and is heated by the overheater to form overheated steam to enter the power generation subsystem for power generation. The solar steam direct power generation system disclosed by the invention realizes the all-weather power generation by adopting a solar steam direct power generation technology through taking water / steam as not only a working medium but also a main heat storage medium and as an auxiliary heat storage medium with coordinate application of the small amount of molten salt.

Description

technical field [0001] The invention belongs to the technical field of solar direct steam power generation, and in particular relates to a solar direct steam power generation system with thermal storage. Background technique [0002] Solar thermal power generation is one of the main forms of solar thermal utilization, among which parabolic trough thermal power generation technology has the highest degree of commercialization and the most widely used. At present, the heat collection subsystem in the trough solar thermal power generation system generally uses heat transfer oil as the heat transfer medium, and generates steam through heat exchange to drive the steam turbine to generate electricity. Since the decomposition temperature of the heat transfer oil limits the improvement of the steam parameters, the power generation efficiency of the steam turbine cannot be further improved. On the other hand, heat transfer oil is expensive, has potential pollution to the environment...

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Problems solved by technology

[0005] In view of this, the present invention provides a solar direct steam power generation system with heat storage to solve the problem of high-efficiency and low-cost heat storage in the solar direct steam power generation technology and the problem of uneven distribution of thermal stress in the circumferential direction of the absorber tube

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