土城矿15510采空区密闭期间，CO浓度不断上升，通过施工注水钻孔向采空区注入清水，有效地降低了采空区内部CO浓度，防止了遗煤自燃。%Aiming at the increase of CO concentration in the closed period of 15510 goaf in T ucheng Colliery ,the author proposes the fresh water injection in goaf by injection drilling construction to reduce the CO concentration inside the goaf effectively and prevent the spontaneous ignition of left-over coal .
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