All-weather solar power generation method and system based on gas enhanced heat transfer

Abstract

The invention discloses an all-weather solar power generation method and system based on gas enhanced heat transfer. The system comprises a solar heat collecting field, a heat storage and release system and a heat engine enhanced operation system; the solar heat collecting field comprises a solar heat collector, a main low-temperature heat-transfer medium pipe, and a main high-temperature heat-transfer medium pipe; the heat storage and release system and the heat engine enhanced operation system are connected between the main low-temperature heat-transfer medium pipe and the main high-temperature heat-transfer medium pipe in parallel; a heat storage tank of the heat storage and release system is internally provided with a top packing area, a middle packing area and a bottom packing area; and the heat engine enhanced operation system comprises a heat expansion machine, a power generator and the like. According to the method, the double-loop system with heat transfer separated from heat storage is adopted, heat-transfer media absorb solar energy circularly in the solar heat collecting field and exchange heat with energy storage media in the heat storage and release system so that heat energy can be stored or obtained, meanwhile, gas mixed with solid particles is used as the heat-transfer media, does work through expansion in the heat engine enhanced operation system after being filtered so that power can be generated, and the heat transfer efficiency is improved.

Description

technical field [0001] The invention relates to solar thermoelectric technology, in particular to an all-weather solar power generation method and system based on gas enhanced heat transfer. Background technique [0002] Solar thermal power generation, also called Concentrating Solar Power (CSP for short), gathers direct solar light in a focused manner through a large number of reflectors, heats the working fluid, and generates high-temperature and high-pressure steam, which drives the steam turbine. generate electricity. [0003] At present, solar thermal power generation is mainly divided into: solar trough power generation, solar tower thermal power generation, and solar dish thermal power generation according to solar energy collection methods. 1) The trough system uses a parabolic trough reflector to focus sunlight onto a tubular receiver, heats the working fluid in the tube to generate steam, and drives a conventional steam turbine to generate electricity. 2) The tow...

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Problems solved by technology

Existing heat storage systems generally use heat transfer media such as molten salt and heat transfer oil to store heat in storage tanks; due to the low heat capacity and poor heat storage capacity of gas heat transfer media, this method is not suitable for gas heat transfer medium

[0006] In order to concentrate heat energy and improve power generation efficiency, the daylighting panels / heat collectors that receive sunlight usually adopt a modular layout, and are connected to each other through complex pipelines. When each group of solar collectors in the system is heated unevenly, it will cause The resistance of the heat transfer medium in the pipeline system is unbalanced, resulting in the problem of bias flow and flow interruption

Due to the poor heat transfer capacity of the gas working medium, the high flow rate, and the long heat collection pipe, the above problems are particularly prominent in the trough solar heat collection field using air as the heat transfer medium, which seriously affects the heat transfer of the heat collection system. Thermal efficiency

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