Focusing strategy optimizing method for mirror fields of tower type solar thermoelectric power system

Abstract

The invention discloses a focusing strategy optimizing method for mirror fields of a tower type solar thermoelectric power system. The focusing strategy optimizing method comprises the following steps: (1) blocking heliostats fields and determining a plurality of focusing points on a heat absorber; (2) calculating an energy flow density matrix produced by focusing each mirror field block to each focusing point; (3) constructing an optimizing problem by taking the smallest standard deviation of the energy flow density of each grid of the heat absorber as a target and adopting a constraint condition that the power of the heat absorber is not smaller than a preset value; and (4) solving the optimizing problem by adopting a multi-variable-site adaptive genetic algorithm with the elitism strategy to obtain the optimal mirror field focusing strategy. The focusing strategy optimizing method for mirror fields of the tower type solar thermoelectric power system disclosed by the invention can be used for enabling the energy on the heating surface of the heat absorber to be uniformly distributed on the premise of ensuring as much as energy received by the heat absorber as possible, is beneficial to protecting the heat absorber, the improving the heat exchange efficiency and strengthening the system performance, so that reference is provided for the operation of the tower type solar heating and power plant.

Description

technical field [0001] The invention relates to the field of tower-type solar thermoelectric systems, in particular to a focusing strategy optimization method for a mirror field of a tower-type solar thermoelectric system. Background technique [0002] The tower solar thermoelectric system uses many heliostats that independently track the sun to focus the sunlight on a heat absorber fixed on the top of the receiving tower, heat the heat transfer medium flowing through the heat absorber, and then use the high temperature medium Heat energy drives steam turbines and generators to generate electricity. It is the lowest cost of all large-scale solar power generation technologies and has a wide range of application prospects. [0003] The light concentrating and heat collecting subsystems in the tower solar thermal power system, including the heliostat field and the heat absorber installed on the receiving tower, etc., have always been the focus of research. In the concentratin...

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Problems solved by technology

[0004] In the existing research on the mirror field focusing strategy, some technologies design the mirror field focusing method to achieve a higher concentration multiple, but they do not take into account the resulting overheating of the heat absorber, which poses a safety hazard; Some technologies aim at uniform energy flow density on the heat absorber and avoid excessive local temperature of the heat absorber, and carry out mirror field focusing strategy scheduling, but the shadow loss and absorption between heliostats are not considered in the concentrating process. There is a gap between the total energy received by the heat sink and the actual situation; some technologies aim to reduce the peak energy flux density of the heat sink, expand the original one focus point to two focus points, and realize the mirror field focus strategy. change, but the effect of improving the uniformity of energy flux density distribution on the heat sink is not obvious

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