Mirror field optimal design method of radiant tower type solar thermoelectric system

Abstract

The invention discloses a mirror field optimal design method of a radiant tower type solar thermoelectric system. According to the method, the product of the comprehensive optical efficiency of a field mirror and the land coverage of the mirror field is used as an optimization goal; a radial space factor and a circumferential space factor of the mirror field are used as optimization variables to optimize by using a simplex algorithm, so that under a certain specific condition of the number and the arrangement of heliostats, the value of the optimization goal is the maximum. According to the mirror field optimal design method, the contradiction between the number of the heliostats and the comprehensive optical efficiency of the mirror field is solved, and better robustness and stability are realized by using the simplex algorithm. The comprehensive optical efficiencies of the radiant small mirror fields arranged through the mirror field optimal design method can all reach over 80 percent and are improved by 10 percent compared with the conventional general mirror field.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a mirror field optimization design method of a radiant tower solar thermoelectric system. Background technique [0002] The tower system, also known as the centralized system, mainly includes several heliostats, receiving towers and heat absorbers installed on the receiving towers. The working principle of tower solar thermal power generation technology is to gather sunlight to the heat absorber on the top of the tower through a certain number of heliostats to generate high temperature, and then heat the medium flowing through the heat absorber to convert light energy into heat energy and generate High-temperature steam drives steam turbines to generate electricity, which is a large-scale and large-scale concentrated power generation method. Each heliostat is equipped with its own tracking mechanism to accurately focus the sunlight reflection on a heat sink at the top of a ...

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Problems solved by technology

[0011] For the optimal design of the mirror field, there are the most traditional ones that take the receiving energy and investment cost as the optimization goals, but for the specific parameters such as the cost of the land area, the cost of the wire, and the cost of the receiving tower included in the investment cost, as well as the construction materials and geographical location and other related factors, it is not easy to estimate uniformly

However, there is a contradictory relationship between the number of heliostats and the comprehensive optical efficiency of the mirror field. If the land area is fixed, when the number of heliostats is large and the arrangement is dense, more shadow occlusion loss will occur, and the overall comprehensive optical efficiency of the mirror field will be higher. The efficiency will decrease accordingly; and when the number of heliostats is small and the arrangement is sparse, the comprehensive optical efficiency of the mirror field will increase relatively

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