Tower type heat absorber and operation method

Abstract

The invention provides a tower type heat absorber which comprises an upper collecting box, a lower collecting box and a heat absorbing pipe assembly arranged between the upper collecting box and the lower collecting box. A solar light secondary reflecting device is arranged at the upper end of the upper collecting box, the heat absorbing pipe assembly is a heat absorbing screen defined by a plurality of heat absorbing pipes, and the joints between the heat absorbing pipe assembly and the upper and lower collecting boxes are close to the peripheries of the upper and lower collecting boxes. Thesolar light secondary reflecting device comprises a posture adjusting device and a reflecting plate group, wherein the posture adjusting device comprises a machine frame and a reflecting plate angle adjusting assembly, and the reflecting plate group comprises reflecting plates which are arranged in the circumferential direction of the upper collecting box in an umbrella shape; and the inner edgesof the reflecting plates are hinged to the periphery of the upper collecting box, and the output end of the reflecting plate angle adjusting assembly is connected with the backs of the reflecting plates. According to the tower type heat absorber, the technical difficulty is low, system control is simple, the reflecting plates are additionally arranged at the top of the heat absorber, the solar light shielded by the lower collecting box can be reused, the light abandoning rate is reduced, the solar energy utilization rate is improved, and when the reflecting plates are placed down, a heat preservation effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of design of a tower-type solar heat absorber, in particular to a tower-type heat absorber and an operation method. Background technique [0002] In recent years, with the dramatic increase in energy demand and the deteriorating environmental problems, solar thermal power generation has been widely used. China is very rich in solar energy resources. The annual solar radiation received by the land surface of China is equivalent to 17,000 tons of standard coal, which is very suitable for the development of solar thermal power generation. [0003] Solar thermal power generation mainly includes four types: tower type, trough type, dish type, and linear Fresnel type. Among them, the tower type thermal power generation system has a concentration ratio of 300-1500, high thermoelectric conversion efficiency and low power generation cost. The tower power generation system is mainly composed of a heliostat field, a h...

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Problems solved by technology

[0004] In actual application, headers are arranged above and below the heat absorber to place high-pressure air tanks, buffer tanks and insulation materials, but the lower header will block part of the light, resulting in a decrease in the solar radiation received by the lower half of the heat absorbing tube. It is easy to cause blockage of molten salt and seriously affect the normal operation of the heat absorber

At the same time, the light spot formed by the solar radiation emitted by the heliostat field is generally circular, resulting in uneven heating of the heat absorbing tube, and local overheating in the middle, while the surrounding temperature is low, which will cause greater thermal stress and shorten the heat absorbing tube. Heater service life

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