Multi-energy combined constant-pressure power generation system

Abstract

The invention discloses a multi-energy combined constant-pressure power generation system. The multi-energy combined constant-pressure power generation system comprises a high-pressure gas system, a heat exchange and storage system, a gas-liquid mixing system, a hydraulic generator set, an expansion power generation system, a channel switching system and a control system, the high-pressure gas system, the gas-liquid mixing system, the hydraulic generator set, the heat exchange and storage system and the expansion power generation system are connected through the channel switching system and controlled by the control system. The constant pressure in the liquid pumping energy storage process is achieved depending on that an expansion machine releases gas and a liquid pump supplements liquidflow, the liquid pumping process is accompanied by the expansion machine power generation process, the expansion machine can generate power to compensate for part of liquid pumping consumed energy, and the liquid pumping energy consumption is reduced; the expansion machine power generation process accompanied by the liquid pumping process can achieve refrigeration; the system not only has the functions of conventional compressed air energy storage and pumped storage power station large-scale electric energy storage, but also can provide multiple kinds of energy, and is flexible in arrangementand long in service life.

Description

technical field [0001] The invention relates to the technical field of new energy storage and power generation, in particular to a multi-energy combined power generation system with constant pressure. Background technique [0002] With the development of large-scale wind energy / photovoltaic resources, my country's wind power / photovoltaic development has maintained a strong momentum of rapid development. By the end of 2018, my country's renewable energy power installed capacity reached 728 million kilowatts, accounting for about 38.3% of the total power installed capacity , but the contradiction between the rapid development of new energy power generation and the relatively lagging power grid construction has become increasingly obvious. Large-scale wind power / photovoltaic energy connected to the grid with the characteristics of randomness, intermittency, anti-regulation and large output fluctuations has a great impact on the voltage stability, transient stability and frequenc...

AI Technical Summary

Problems solved by technology

However, the traditional compressed air energy storage power stations represented by the Huntorf compressed air energy storage power station in Germany and the McIntosh compressed air energy storage power station in the United States rely on external natural gas fuel supplementation, have an impact on the environment, and have low conversion efficiency of high-pressure air to electricity (less than 50%). Relying on large-volume cave resources and inflexible layout

At present, the most advanced advanced adiabatic compressed air storage often requires at least tens of thousands of cubic meters of large-volume abandoned mines and caves to store high-pressure air, which is seriously dependent on cave resources, inflexible layout, and high investment costs (every few billion RMB) ), the process of energy storage and energy release is in an adiabatic process, and there are problems of easy escape of heat and low conversion efficiency

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