Solar heat absorber with topside heat absorbing structure

Abstract

The invention provides a solar heat absorber with a topside heat absorbing structure, which adopts a structure that an annular heat absorbing surface is arranged at the top of the light receiving area of a cylindrical heat absorber, and the inner ring of the absorbing area is identical with the shape of the heat absorber cylinder and welded with the heat absorber; the outer ring of the absorbing area is circular or the variable shape as the inner ring; the annular heat absorbing surface can be formed by welding heat absorbing tubes on an annular plate (tube-plate structure), or can be formed by the heat absorbing tubes directly welded or finned welded (film-wall structure); and a high-absorbing coating is coated on the lower surface of the annular heat absorbing surface, so as to improve the utilization rate of the solar energy. The topside heat absorbing structure can recycle the sunlight overflown to the upper part of the cylindrical heat absorber, so as to improve the integral converting efficiency of the heat absorber.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, and in particular relates to a solar heat absorber with a top edge heat absorbing plate structure. Background technique [0002] my country's primary energy reserves account for about 10% of the world's total reserves, while the population accounts for about 25% of the world's population. In the energy structure, nearly 70% of the energy consumption depends on coal, and the resulting resource and environmental problems are prominent. In the long run, renewable energy led by solar energy will be the hope for the future of mankind. Solar high-temperature thermal power generation technology is an important direction for large-scale utilization of solar energy, and it has far-reaching significance for human beings to solve problems such as fossil energy crisis and air pollution. According to different focusing methods, solar high-temperature thermal power generation can be divided ...

AI Technical Summary

Problems solved by technology

However, it is more difficult to distribute the heat load evenly on the heating surface inside the cavity type heat absorber, so it is easy to cause tube explosion (when water is used as the heat-absorbing medium) or pipe plugging (when molten salt is used as the heat-carrying medium) on the heat-absorbing surface; In addition, the shape of the cavity heat absorber is complex and difficult to process.

The structure of the cylindrical heat absorber is relatively simple, and the heat load on the surface is easier to achieve relatively uniform under the existing control technology, which is conducive to improving the safety of the cylindrical heat absorber; The space area is large, the solar radiation spillover rate to the input is high, and the convective radiation heat dissipation loss is relatively high, which will affect the efficiency of the heat sink to a certain extent

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