All-weather solar power generation method and system based on whole-process pressure operation

Abstract

The invention discloses an all-weather solar power generation method and system based on whole-process pressure operation. The system comprises a solar heat collection field, a heat storage and release system and a steam power generation system. The solar heat collection field comprises solar heat collectors, low-temperature heat-transfer medium mother pipes and high-temperature heat-transfer medium mother pipes. The heat storage and release system and the steam power generation system are connected between the low-temperature heat-transfer medium mother pipes and the high-temperature heat-transfer medium mother pipes in a parallel manner. Each heat storage tank body of the heat storage and release system is internally provided with a top padding area, one or more middle padding areas and a bottom padding area, wherein each top padding area, the corresponding middle padding areas and the corresponding bottom padding area communicate with one another in sequence; and each padding area is provided with a corresponding inlet switching valve. According to the method, the double-loop system with heat transfer and heat storage separated is adopted; a heat-transfer medium absorbs solar energy cyclically in the solar heat collection field and exchanges heat with an energy storage medium in the heat storage and release system so that heat energy can be stored or obtained; steam is produced in the steam power generation system, so that power generation is conducted; meanwhile, a pressure gas medium is adopted as the heat-transfer medium; and the heat storage and release effect and power generation 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 full-range pressurized operation. 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) Th...

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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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