Double-working-medium circulating pressurized water energy storage system and control method

Abstract

The invention discloses a double-working-medium circulating pressurized water energy storage system and a control method. The system comprises a heater, a normal-temperature and normal-pressure water storage tank, a high-temperature and high-pressure water storage tank, a flash tank, a steam turbine, a circulating water booster pump, a circulating water cooler, a machine working medium turbine, an organic working medium booster pump and an organic working medium cooler. According to the control method, a normal-temperature and normal-pressure water storage tank is adopted to store normal-temperature and normal-pressure water, the water is heated and pressurized through a booster pump and a heater, and a high-temperature and high-pressure water storage tank is adopted as an energy storage container to store internal energy of high-temperature and high-pressure water; when surplus heat energy exists in the energy releasing process, the water circulation system adopts flash evaporation-Rankine coupling circulation, part of high-temperature and high-pressure saturated water is further pressurized and heated through a second circulation water pump and a heater, and generated superheated steam is used for driving a first steam turbine; saturated steam generated by flash evaporation of high-temperature and high-pressure saturated water and exhaust steam of the high-pressure stage turbine are used for driving the second steam turbine, and efficient gradient utilization of waste heat resources is fully achieved.

Description

technical field [0001] The invention belongs to the field of physical energy storage, and specifically relates to a duplex mass circulating pressurized water energy storage system and a control method. Background technique [0002] Existing energy storage technologies include pumped storage, compressed air energy storage, superconducting energy storage, and electrochemical energy storage. The pumped storage system has a simple structure, high efficiency, and large capacity. It is the most complete energy storage technology in the industry at present. , and has achieved commercial applications all over the world. However, the pumped storage system has the requirement of poor geographical environment and will affect the local ecological environment. Therefore, it needs to consider various factors such as the ecological environment; Disadvantages such as long term and poor flexibility. [0003] Therefore, there is an urgent need to improve the traditional pumped storage syste...

AI Technical Summary

Problems solved by technology

However, the pumped storage system has the requirement of poor geographical environment and will affect the local ecological environment. Therefore, it needs to consider various factors such as the ecological environment. In addition, the traditional pumped storage system is often large in scale, with high investment costs and recycling Disadvantages such as long term and poor flexibility

Images