Composite pumped storage system and operation method thereof

Abstract

The invention discloses a composite pumped storage system and an operation method thereof. The system comprises a pumped storage module and a pressure regulating energy storage module; The pumped storage module comprises an upper reservoir and a lower reservoir which are communicated with each other, a ground reservoir forms the upper reservoir, a coal mine tunnel sealed by a sluice wall forms the lower reservoir, and a pump turbine and a filter are arranged between the upper reservoir and the lower reservoir; the pressure regulating and energy storing module comprises a compressor unit and an expansion unit, a low-pressure-stage compressor and a high-pressure-stage compressor are arranged in the compressor unit, a heat accumulator is arranged at an outlet of the compressor to utilize compression heat, and a fluidized bed reactor is installed in front of an inlet of the expansion unit to treat coal bed gas; inlets of all stages of expansion machines except a high-pressure-stage expansion machine are connected to an upper end outlet of the fluidized bed reactor through a tee joint and a control valve to deal with the problem of variable working conditions; and the back pressure of the pump turbine of the pumped storage module is constant, and the cavitation problem caused by the too low back pressure of the pump turbine set and the efficiency reduction caused by the too high back pressure are avoided.

Description

technical field [0001] The invention belongs to the fields of general equipment manufacturing and physical energy storage, and specifically relates to a composite pumped storage system and an operating method thereof. Background technique [0002] At present, there are many types of energy storage technologies, and among many physical energy storage technologies, only compressed air energy storage (CAES) and pumped hydro energy storage (PHES) can be applied on a large scale. Although pumped storage systems have many advantages over other energy storage systems, pumped storage systems still have unavoidable disadvantages: pumped storage systems require an open-air environment, destroy civil engineering, build upper and lower reservoirs, and cause damage to the ecological environment. [0003] Under the guidance of the concept of green and low-carbon development, many coal mines have been shut down across the country. In addition to the coal mines that have been mined, there a...

AI Technical Summary

Problems solved by technology

Although pumped storage systems have many advantages over other energy storage systems, pumped storage systems still have unavoidable disadvantages: pumped storage systems require an open-air environment, destroy civil engineering, build upper and lower reservoirs, and cause damage to the ecological environment

Changes in the liquid level in the underground roadway lead to changes in the liquid level difference between the upper and lower reservoirs, the water head height of the turbine changes, and the turbine deviates from the design working point to be in a variable working condition, which eventually leads to a decrease in system efficiency

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