High-concentration CO treatment technology based on the characteristics  of emergence in the goaf oxidation temperature rise zone

In the production process of coal mines, the spontaneous combustion of residual coal in gob will bring great threat to the safety of mine life and 〖JP2〗property. In this paper, the oxidative heating zone of mine gob was regarded as a system. The high concentration of CO presented by the system was affected by various factors such as residual coal, air and heat storage conditions in the oxidative heating zone. By analyzing the emergent scale effect, structural effect, and low-level characteristics of the complex system, the production law of high-concentration CO in the oxidation heating zone of gob and the subordinate correlation factors were obtained. On this basis, according to the theoretical guidance of emergence, in view of the problem of high concentration CO control in the oxidative heating zone of 22410 gob in Bulianta Coal Mine of Shendong, combined with the actual conditions of the geological structure of the working face, the overlying coal pillars, the coal mining technology and the mechanical and electrical failures, the causes of high concentration CO in the oxidation heating zone of the gob were deeply analyzed from four aspects：the spontaneous combustion characteristics of the coal body, the excess residual coal in the gob, the developed oxygen supply channel and the slow advance speed of the fully mechanized mining face. After the comprehensive control measures such as controlling the residual coal, blocking the air leakage channel, grouting from the upper corner to the gob, piling the rock powder wall in the upper corner, controlling of the air volume of the working face, and real-time monitoring of the upper corner and the gob gas, the high concentration CO problem in the oxidation heating zone of the goab was quickly and effectively controlled, thereby avoiding the risk of spontaneous combustion in the gob of the fully mechanized mining face in the mining process, and avoiding the huge economic losses. At the same time, the safety of personnel is ensured. From this, it is concluded that the emergent characteristics of the system can guide and solve the potential disaster problems encountered〖JP〗 in the production process of coal mines and have great application value.