Method for correcting secondary reflector in tower type solar secondary reflection system

Abstract

The invention discloses a method for correcting a secondary reflector in a tower type solar secondary reflection system. The posture of the heliostat can be described by a height angle and an azimuthangle, a light sensing device is arranged around the heat absorber, a reflection principle is utilized to enable the reflected light rays to finally pass through a photosensitive device around the heat absorber through rotating the heliostat, the image obtained by the light sensing equipment is processed, the offset between the actual light spot and the ideal target point is obtained through imageprocessing, the height angle and the azimuth angle of the heliostat are recorded, the light rays are led to all the photosensitive devices around the heat absorber to obtain a plurality of sets of heliostat postures and offset amounts, and one-time sampling is completed. Different moments are selected, sampling is carried out again, non-linear fitting is carried out after several times of sampling, the light spot deviation caused by the installation and manufacturing deviation of the secondary reflector is made up, and the purpose of correcting the secondary reflector is achieved. The methodfor correcting secondary reflector has the advantages that the steps are simple, the practicability is high, the error can be reduced, the overall efficiency can be improved, and the economical efficiency of the whole power station can be improved.

Description

technical field [0001] The invention belongs to the technical field of tower-type solar thermal power generation, and in particular relates to a method for correcting a secondary reflector in a tower-type solar secondary reflection system. Background technique [0002] Tower-type solar thermal power generation technology is a kind of solar power generation technology that has been developed. The principle of solar thermal power generation is to convert solar energy into thermal energy first, and then convert thermal energy into electrical energy. However, due to the low density of solar energy, it often requires The larger light-collecting surface changes the direction of light propagation by concentrating light, focusing the light to increase the energy density, so as to meet the power generation requirements. [0003] At present, the tower-type photothermal power generation system uses more than one reflection for the concentration and reflection of sunlight, that is, the ...

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Problems solved by technology

In this way, the heat absorber is arranged at a height of about 100 meters from the ground, and its convection loss is large and the operation and maintenance costs are high, which affects the economy of the entire power station, and is a restriction for large-scale solar thermal power generation with a reflection tower. factors of development

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