All-weather solar power generation method and system doing work based on heat engine expansion

Abstract

The invention discloses an all-weather solar power generation method and system doing work based on heat engine expansion. The system comprises a solar heat collecting yard, a heat storing and releasing system and a heat engine expansion running system; the solar heat collecting yard comprises a solar heat collector, a low temperature heat transfer medium mother pipe and a high temperature heat transfer medium mother pipe; the heat storing and releasing system and the heat engine expansion running system are connected between the low temperature heat transfer medium mother pipe and the high temperature heat transfer medium mother pipe in parallel; a top filler area, a middle filler area and a bottom filler area are arranged in a heat storing tank of the heat storing and releasing system; and the heat engine expansion running system comprises a heat expansion machine, a power generator and the like. The dual-loop system with heat transfer and heat storage separated is adopted for the method, heat transfer media are circulated in the solar heat collecting yard to absorb solar energy, exchange heat with energy storing media in the heat storing and releasing system to store or acquire heat energy, and do work through expansion to generate power in the heat engine expansion running system, meanwhile, gas media under pressure are adopted as the heat transfer media, and the heat storing and releasing effect and the power generating efficiency are improved.

Description

Technical field [0001] The invention relates to solar thermal power technology, in particular to an all-weather solar power generation method and system based on thermal engine expansion to perform work. Background technique [0002] Solar thermal power generation, also called Concentrating Solar Power (CSP), uses a large number of reflective mirrors to gather direct solar light in a focused manner to heat the working fluid to produce high-temperature and high-pressure steam. The steam drives the steam turbine. Power generation. [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 cylindrical trough reflector to focus sunlight on a tubular receiver, and heat the working fluid in the tube to generate steam, which drives conventional steam turbines to generate electricity...

AI Technical Summary

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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