Shanghai Datun Energy Jiangsu Branch Kongzhuang Coal Mine

煤炭自燃程度的准确预测是煤层自然发火防治的关键,较为单一的预警指标和简单的预警方法不能准确判断采空区煤自燃所处的阶段。为进一步提高煤自燃预警的可靠性,以孔庄煤矿为研究对象,进行了程序升温煤自然发火实验,探究该矿煤自燃过程中气体浓度变化规律和温度的关系,测定煤氧化升温过程中各特征气体的初现浓度,依据CO、C2H6、C2H4、C2H2的出现规律和CO/O2、CO/CO2、C2H4/C2H6的变化规律,确定了5个特征温度,将煤自燃过程划分为安全期、氧化期、升温期、热分解期、裂变期和燃烧期6个阶段,提出孔庄煤矿7436工作面煤自燃分级预警指标体系。应用该分级预警体系成功地预测了7436工作面采空区煤炭自燃程度,通过及时采取注氮与注浆措施保证了该工作面的安全回采。

The accurate prediction of the degree of coal spontaneous combustion is the key to the prevention and control of coal seam spontaneous combustion. A relatively single early warning index and simple early warning method cannot accurately determine the stage of coal spontaneous combustion in goaf. In order to further improve the reliability of coal spontaneous combustion early warning, taking Kongzhuang Coal Mine as a research object, a programmed temperature coal spontaneous combustion experiment is conducted to explore the relationship between gas concentration variation law and temperature during the coal spontaneous combustion process in this mine. The initial concentrations of various characteristic gases during the coal oxidation and heating process are measured. According to the occurrence laws of CO, CH, CH, CH and the variation laws in CO/O, CO/CO, CH/CH, five characteristic temperatures are determined, and the coal spontaneous combustion process is divided into six stages such as safe period, oxidation period, heating period, thermal decomposition period, fission period, and combustion period. A grading early warning index system for coal spontaneous combustion in the 7436 working face of Kongzhuang Coal Mine is proposed. The application of this grading early warning system successfully predicts the degree of coal spontaneous combustion in the goaf of the 7436 working face, and ensures the safe stoping of this working face by taking timely nitrogen injection and grouting measures.