Method of utilizing downhole roadway in coal mine for compressed air energy storage

Abstract The present invention discloses a method of utilizing a downhole roadway in a coal mine for compressed air energy storage, first, the cross section of a roadway is renovated, specifically 5 including: the rock mass of surrounding rock of the roadway is reinforced by high-pressure grouting, to form a bearing layer that is stable in a wide scope; a circular reinforced concrete lining is constructed according to the cross-sectional shape of the roadway, the inner surface of the lining is smoothened, and then a rubber or steel lining is bonded to the inner surface; the space between the original cross section of the roadway and the reinforced concrete lining 10 is filled by grouting; then the two end faces of the roadway are sealed; finally, a flexible air storage bag is placed in the treated roadway. In a working process, compressed air is stored and retrieved through an air inflow pipeline and an air outflow pipeline that are connected to the flexible air storage bag. The method provides an approach for compressed air energy storage in a downhole roadway in a coal mine, which is reliable, safe, and easy to maintain. 10691978_1 (GHMatters) P109774.AU