Double Brayton combined cycle solar power generation system with heat storage function and method

Abstract

The invention discloses a double Brayton combined cycle solar power generation system with a heat storage function and a method. The system comprises an air compressor, an inlet of the air compressoris communicated with outside air, an outlet of the air compressor is communicated with a low-temperature side inlet of an air heat regenerator, a low-temperature side outlet of the air heat regenerator is communicated with an inlet of an air turbine, an outlet of the air turbine is divided into two paths, one path is communicated with an inlet of a solar heat collector, and the other path is connected with an inlet of a high-temperature heat accumulator; and an outlet of the solar heat collector is divided into two paths, one path is connected with an inlet of the high-temperature heat accumulator, the other path is connected with an air side inlet of an air-carbon dioxide heat exchanger, an outlet of the high-temperature heat accumulator is divided into two paths, one path is connected with the air side inlet of the air-carbon dioxide heat exchanger, the other path is connected with a high-temperature side inlet of an air heat exchanger after converging with an air side outlet of theair-carbon dioxide heat exchanger, and a high-temperature side outlet of the air heat exchanger is communicated with outside air. By means of the system, material cost and material consumption can beeffectively reduced, and power generation efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of solar power generation, in particular to a double Brayton combined cycle solar power generation system and method with thermal storage. Background technique [0002] Solar energy is an inexhaustible clean energy source. Because solar thermal power generation can theoretically reach the same high temperature as the sun’s temperature, and as we all know, the higher the temperature, the higher the thermal efficiency, so solar thermal power generation has attracted more and more attention. . [0003] Photothermal power generation needs to convert light energy into heat energy, and then realize thermoelectric conversion through a thermodynamic cycle. At present, among many thermodynamic cycles, the supercritical Brayton cycle is the most advantageous cycle form. New supercritical working fluids such as carbon dioxide, helium and nitrous oxide have inherent advantages such as high energy density, high heat tra...

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Problems solved by technology

[0004] However, the heat collection temperature of solar towers is not high at present, and material problems account for a large part of the reason. At present, the high-temperature materials actually used in steam turbines for power generation are within 620°C, which is far lower than the heat source temperature that solar collectors can achieve. , In addition, solar thermal power generation generally must consider heat storage, and large heat storage devices are generally arranged on the ground, so the distance between the heat collector on the top of the tower, the heat storage device and the generator set will be relatively long, and the high efficiency power generation The main steam pressure of the unit is relatively high, so the pipe wall is very thick. If the pipes are made of high-temperature-resistant alloy materials and transported over such a long distance, the cost will be huge, which is obviously unacceptable

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