Heat absorber phase-change material heat-preservation method and device for tower type solar thermal power plant

Abstract

The invention discloses a heat absorber phase-change material heat-preservation method and device for a tower type solar thermal power plant. In case of cloud shielding, direct solar radiation is lower than a certain threshold, a liquid phase-change material can be released from the top of an outer wall surface of a heat absorber, the liquid phase-change material is adhered to the outer wall surface of the heat absorber, and as the liquid phase-change material is small in heat conduction coefficient, heat can be released to keep stable temperature when the liquid phase-change material is converted into a solid state, heat loss of the heat absorber is reduced, the wall temperature fluctuation of the heat absorber is reduced, the service life of the heat absorber can be prolonged, and a molten salt medium inside the heat absorber can be prevented from solidifying, and the system security is improved; when cloud shielding disappears, under the action of solar radiation, the solid phase-change material is liquefied and drops down, and the phase-change material is collected, fed back to the top of the heat absorber through a phase-change material conveying system, and thus can be repeatedly used.

Description

Technical field [0001] The invention relates to the technical field of solar power generation, in particular to a heat-preservation method and device of phase change material for a heat absorber of tower solar thermal power generation. Background technique [0002] From the perspective of ensuring energy security and promoting sustainable development, solar power technology is an effective means to alleviate the current energy crisis, and its application prospects are extremely broad. China is very rich in solar energy resources. In the nearly 30 years from 1971 to 2000, the total annual solar radiation averaged 1050-2450kW·h / m 2 Between, greater than 1050kW·h / m 2 The area of ​​the country accounts for more than 96% of the land area. The annual solar radiation received by China’s land surface is equivalent to 17,000 tons of standard coal. Only the development and utilization of 0.7% of solar radiation can solve the current energy consumption problem in China. [0003] Solar therma...

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Problems solved by technology

[0005] The purpose of the present invention is to alleviate the severe temperature fluctuation of the wall surface of the heat absorber caused by the current tower heat absorber when it is blocked by clouds, prolong the service life and improve the safety of operation, and propose a phase change material heat preservation for the heat absorber of the tower type solar thermal power generation method

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