Experimental Research On Index Gas Of Spontaneous Combustion In Dongrong No.1 Coal Mine Based On Principal Component Analysis

In order to prevent the disaster which caused by coal spontaneous combustion in DongRong Coal Mine effectively.The detection and monitoring of the early generation of the signal gas produced by the combustion of coal combustion and the timely and accurate prediction of the development of coal spontaneous combustion.The development situation of coal spontaneous combustion in coal mine spontaneous combustion prevention and control work has the vital-significance.Industrial analysis of seven coal seams in DongRong Coal Mine was carried out by industrial analyzer,and the industrial analysis parameters of different coal seams were obtained;Using the self-constructed coal spontaneous combustion test platform which includes program temperature-raising system and gas chromatographic analysis system,the coal oxidation auto-ignition test was performed on the coal samples of the Dongrong Coal Mine,at the same time in the process of oxidation of coal spontaneous combustion gas product and the corresponding relation of oxidation temperature of coal samples are analyzed;Combined with statistical software SPSS,the original experimental data of coal oxidation spontaneous combustion experiment were analyzed by using principal component analysis which makes a comprehensive evaluation on various indexes and affects the spontaneous combustion of coal,and selects the indexes suitable for each coal seam to predict the spontaneous combustion process of coal.The main research results are as follows:（1）In single index gas,with the change of coal oxidation temperature,CO,C₂H₆,C₂H₄,C₂H₂and other marker gases show a regular exponential increase during the oxidation temperature rising process.The critical temperature,respectively,marked the oxidized spontaneous combustion of coal low temperature oxidation phase,accelerated oxidation and intense oxidation phase,so the above gases can be used as a forecast of coal spontaneous combustion index gases;With the increase of coal oxidation temperature,C₂H₄/C₂H₆ in the composite index shows some regularity,which can reflect that the process of coal spontaneous combustion is in the accelerated oxidation stage,so C₂H₄/C₂H₆ can be used as an indicator of forecasting system.（2）Based on principal component analysis for temperature programmed oxidation theory analysis on the experimental data,comprehensive evaluation was performed on nine indicators such as temperature,CO,C₂H₄,C₂H₆,C₂H₂,and C₂H₄/C₂H₆,and CO,C₂H₄,C₂H₄/C₂H₆ can be used as a prediction index.（3）Comprehensive use of gas analysis methods and principal component analysis method to establish a comprehensive prediction system for coal oxidation and self-ignition with different indicators in different stages of development.The CO,C₂H₄,C₂H₆,and C₂H₂ were the main indicator gases,and C2H4/C2H6 was a comprehensive index forecasting system for auxiliary indicators.In the low temperature oxidation stage,CO is selected as the main index gas and the temperature range is 15¹07℃;In the accelerated oxidation phase,C₂H₄ was selected as the main index gas,C₂H₆ and C₂H₄/C₂H₆ were used as auxiliary indicators.The temperature range was 107²07℃;In the intense oxidation stage,C₂H₂ is selected as the main index gas forecasting system.