Method for efficiently treating spontaneous ignition of remaining coal in large area goaf of shallow-buried coal bed

摘要

A method for efficiently treating spontaneous ignition of the remaining coal in a large area goaf of a shallow-buried coal bed, which belongs to a method for preventing coal from spontaneous ignition, comprises the following steps: prejudging whether the remaining coal in the goaf ignites spontaneously, if the remaining coal in the goaf ignites spontaneously, firstly enclosing a spontaneous ignition high-temperature area of the remaining coal in the goaf, secondly injecting nitrogen continuously at a large flow in the large area goaf under the shaft to reduce the oxygen concentration in the goaf, reducing the air leakage in the goaf by a technology of pressure balance for air control, releasing a sulphur hexafluoride trace gas to conduct qualitative analysis the air leaking channel in communication with the goaf and to carry out leaking stoppage, then carrying out a treatment and detection using a ground fire extinguishing drill hole, i.e., injecting a fire extinguishing material to treat the spontaneous ignition of the coal in the goaf and utilizing an effective drill hole to judge whether the spontaneous ignition of the coal in the goaf extinguishes or not, and finally filling the spontaneous ignition high temperature area of the coal as well as to drill hole by injecting bodying mortar or high concentration coal ash slurry. The method integrates leaking stoppage, airflow control and fast inerting and cooling so as to efficiently prevent and treat the spontaneous ignition of the remaining coal in the large area goaf of the shallow-buried coal bed.