Transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system and operation method

Abstract

The invention discloses a transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system and an operation method. The transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system comprises a steam turbine steam cycle power generation system and a transcritical carbon dioxide energy storage system, energy storage compression heat in the transcritical carbon dioxide energy storage system is used for heating condensed water, high-temperature and high-pressure steam is used for heating high-pressure and low-temperature carbon dioxide in the energy release stage, the situation that a heat accumulator is used for collecting compression heat to heat the carbon dioxide in the energy release stage is avoided, and the economical efficiency of a unit is improved. According to the system, air is replaced with the carbon dioxide, the critical temperature of the carbon dioxide is 31.1 DEG C, liquid storage can be achieved at the normal temperature, the liquefaction difficulty is greatly reduced, meanwhile, the density of supercritical carbon dioxide is close to that of liquid, the viscosity of supercritical carbon dioxide is close to that of gas, and the supercritical carbon dioxide has good fluidity and transmission characteristics; and the supercritical carbon dioxide is used for replacing air as an energy storage medium, the energy storage density is greatly improved, the scale of a storage system is remarkably reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of physical energy storage, and in particular relates to a transcritical carbon dioxide energy storage coupled steam turbine power generation peak regulation system and an operating method. Background technique [0002] With the continuous utilization of energy, the large-scale application of new energy and the large-scale grid connection of intermittent renewable energy, many energy application problems have also emerged. The application of energy storage technology is an effective way to solve the above problems. Energy storage technology can assist the dynamic operation of traditional power generation systems, help renewable energy to cut peaks and fill valleys, and track planned output. At present, there are only two large-scale energy storage technologies that can be maturely applied in the world: pumped hydro storage and compressed air energy storage. Steam turbine technology, supplemental combustion ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a transcritical carbon dioxide energy storage coupled steam turbine power generation peak-shaving system and operation method to solve the problem that low-temperature liquid storage is difficult to achieve in the air energy storage system

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