Heliostat mirror field used for tower solar thermal power plant

Abstract

The invention discloses a heliostat mirror field used for a tower solar thermal power plant. The heliostat mirror field comprises a near-tower area and a far-tower area. The density of heliostats in the near-tower area is larger than that of heliostats in the far-tower area. The near-tower area comprises at least one near-tower subarea. The far-tower area comprises at least one far-tower subarea. The arrangement mode of the heliostats in each near-tower subarea is any one of the linear fixed mirror line space staggered arrangement mode, the linear fixed mirror line space non-staggered arrangement mode and the annular variable mirror line space non-staggered arrangement mode. The arrangement mode of the heliostats in each far-tower subarea is any one of the linear variable mirror line space staggered arrangement mode and the annular variable mirror line space staggered arrangement mode. Compared with the prior art, when the scale of a power station is large, the reflection efficiency of a solar mirror field is effectively improved, the arrangement rules are simple and clear, and construction and maintenance are easy.

Description

technical field [0001] The invention belongs to the field of solar thermal power generation, in particular to a heliostat mirror field used in a tower type solar thermal power plant. Background technique [0002] The tower solar thermal power generation system is a solar mirror field composed of a series of heliostats with the function of automatically tracking the sun's trajectory, which concentrates and reflects sunlight to a heat absorber installed at a certain height, and heats the heat flowing through the heat absorber. The working fluid converts light energy into heat energy, thereby directly or indirectly generating high-temperature steam to drive a steam turbine to generate electricity. [0003] In the solar mirror field, the layout of heliostats directly affects the photoelectric efficiency of the tower solar thermal power generation system. At the same time, the total investment cost of the heliostat accounts for 40%-50% of the total investment cost of the power s...

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Problems solved by technology

[0005] Chinese patent CN102753906B discloses a bionic heliostat arrangement method, which is to arrange the heliostats according to the Fermat spiral rule, which reduces the shadow occlusion loss between the heliostats to a certain extent and improves the efficiency of the mirror field , but the mirror field arranged in this way is relatively complicated, which is not convenient for the construction and maintenance of actual projects, and is not suitable for the practical application of large-scale tower solar thermal power stations

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