System and method for pumped-storage power generation by using underground goaf and chamber

Abstract

The invention relates to a system and method for pumped-storage power generation by using an underground goaf and a chamber, and belongs to the technical field of mining and energy engineering. The system for pumped-storage power generation comprises a surface shaft tower, a vertical shaft, a surface transmission line, a surface power transmission station, a power transmission line, a power generation chamber, an upper water storage space and a lower water storage space; the power transmission line is arranged in the vertical shaft, and the power transmission terminal of a hydro-generator anda water pump are both electrically connected with the surface power transmission station through the power transmission line and the surface transmission line in sequence; and the surface power transmission station is electrically connected with a power grid through a transmission cable. According to the system, goafs, waste chambers and tunnels at different altitude difference positions of underground metal mines are used as water storage spaces; water in a lower goaf is pumped into an upper goaf for storage by using extra (waste) electrical energy of an external power grid in the off-peak period of electricity utilization; and the water in the upper goaf is discharged to the lower goaf for power generation in the peak period of electricity utilization, so that the gap of the external power grid is supplemented.

Description

technical field [0001] The invention relates to a system and a power generation method for pumped storage power generation by utilizing underground mined-out areas and chambers, and belongs to the technical field of mining and energy engineering. Background technique [0002] Underground mining is the main method of mineral resource development. At present, the proportions of open field method, caving method and filling method in my country are 59.2%, 33.0% and 5.8%, respectively, and the proportions of the three types of mining methods in non-ferrous mines are 55.5%, 33.1% and 11.4% respectively. Among the open field methods, the proportion of the ore retention method accounts for 66.7%, and it remains stable. Due to the extensive use of the open-field method, there are a large number of goafs underground. According to conservative estimates by relevant departments, the cumulative volume of mine goafs in my country exceeds 25 billion m 3 . There are two main ways that t...

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Problems solved by technology

However, water energy, solar energy, and wind energy are affected by factors such as seasons, locations, and climates, which are random, intermittent, and volatile, and cannot maintain a stable constant supply, resulting in serious energy abandonment. In 2015, Yunnan Province only abandoned water and wind. , the abandoned photovoltaic power reached 15.3 billion kwh

Due to the poor stability and continuity of power generation, this poses a huge challenge to the real-time balance of the power system and the safe and stable operation of the power grid after wind power is connected to the grid.

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