Variation trend and correlation of multi parameters in the workface in the coal seam containing CO 2 and N 2

The mechanized mining face of F6103 in Buliangou Coal Mine was selected to make clear the source of CO and investigate the variation trend and correlation of the airflow temperature,the concentration of CH4,O2 and CO.First the parameters were observed and recorded in thirty-five consecutive days.Second these observational data were handled and analyzed by Matlab on the basis of the least square method and the mathematical statistical method.The analysis results show that the airflow temperature,the concentration of CH4 and CO of the gauging point of 2,3,4,5 and 6 along the working face gradually increase with the increase of the distance from the intake airway.The peak values of every parameter always appear the gauging point of 6 of the return airway.The airflow temperature,the concentration of CH4 and CO of the gauging point of 8 of the return corner varies with quartic polynomial of the observation time during the thirty-five consecutive days.By calculating the own correlation coefficient among these parameters of the gauging point of 6 and 8.It can be known that CO of each gauging point of 6 and 8 is negative correlation with O2 respectively.But CO of each gauging point of 6 and 8 is positive correlation with the airflow temperature and CH4 respectively.By calculating the ratio correlation coefficient between the parameters of the gauging point of 5 and 8 comparing to the gauging point of 6,it can be known that CO of the gauging point of 5 and 8 is negative correlation with O2 of the gauging point of 6.CO of each gauging point of 5 and 8 is positive correlation with the airflow temperature,CH4 and CO of the gauging point of 6.CH4 of each gauging point of 5 and 8 is negative correlation with the airflow temperature and O2 of the gauging point of 6.CH4 of each gauging point of 5 and 8 is positive correlation with the CH4 and CO of the gauging point of 6.The source of CO is consisted of three components.They are respectively the releasing during operation of the underground diesel locomotives,the transient high temperature oxidation when coal cutting machine cuts the hard coal and the eremacausis between the fragmentized coal and oxygen.