Environmental treatment technology for complex coalfield fire zone in a close distance coal seam—A case study

Abstract

To achieve fast and effective control of complex coalfield fire areas in close-distance coal seams, proposals regarding “blocking air leakage, reducing oxygen, eliminating high temperature, and preventing re-ignition” were put forward. Combined with isotope radon measurement, infrared thermal imaging and ground drilling construction technology, the exact location of coalfield fire source was outlined. According to the characteristics of coalfield fire areas in Liujiamao and Qian’an mines, a set of economical and efficient coalfield fire control and extinguishing plans have been developed, which include the isolation of the production system, treatment of slope, injection of fly ash composite colloid, and excavation. The results show that the combined application of multiple detection technologies can accurately determine the location of fire source and divide three regions according to the temperature distribution. In addition, we developed a set of coalfield fire detection, fire-fighting equipment, fire-fighting materials and data monitoring as one of the coalfield fire control and extinguishing technology. Through the implementation of the plan, the coalfield fire disaster of Liujiamao and Qian’an mines was successfully solved. The successful application of this technology provides theoretical and technical support for similar coalfield fire control and extinguishing.