废弃煤矿采空区抽水蓄能水库初步可行性研究

近年来中国的风能太阳能发电取得了巨大的进步,装机容量跃居世界第一。由于相关配套储能设施的匮乏,造成了大量的弃风、弃光、弃电等现象。目前中国的电网储能主要依靠抽水蓄能电站。采用废弃煤矿建设抽水蓄能电站可以提高中国对风能太阳能的高效利用,同时实现废弃煤矿资源化和水资源保护。从采空区的可储空间和采空区的地下布置问题初步研究了废弃煤矿采空区抽水蓄能水库的可行性。研究发现:采空区的渗透系数越大,则越多的水可以被抽出或注入,其有效库容也越大。若是满足有效库容系数(有效库容与总库容的比值)大于0.8,则采空区的渗透系数需大于8×10~(-8) m~2,采空区上下水库间距越小,上水库水量的漏失量也越大。

Preliminary feasibility analysis of abandoned coal goafs as PHES reservoirs

Clean energy, such as wind power and solar power, has been greatly developed in China, whose installed capacity has ranked the first in the world. However, the shortage of the matched storage facilities causes a lot of wind, solar and electricity abandonment. Pumped-hydro energy storage (PHS) plants currently dominate the energy storage market in China. Utilizing abandoned coal mine goafs as PHS reservoirs can not only enhance the efficient utilization of clean energy, but also reuse the wastes and protect the underground water resources. This paper investigates the preliminary feasibility of goafs as PHS underground reservoirs in terms of storable space and safe distance. The results show that as the permeability of goaf increases, the effective capacity of reservoirs rises. With the permeability above 8×10^-8 m², the effective coefficient(the ratio of effective capacity to total capacity) of underground goaf-reservoir can reach 0.8. A smaller horizontal distance between two reservoirs will lead to a larger leakage rate of the upper one and the acceptable distance for a typical coal mine geology is suggested.The results can provide a reference for the construction of coal mine PHES plants.