Study on the Correlation Between Coal Pore Structure and Spontaneous Combustion Ignition Temperature Based on Correlation Coefficient Method
In order to explore the correlation between the pore structure parameters in coal and the spontaneous combustion ignition temperature of coal,the pore structure and pore size distribution of four kinds of coal samples with different metamorphic degrees were tested by liquid nitrogen adsorption tests.The spontaneous combustion ignition temperature and ignition ability of coal were obtained by thermogravimetric test.The correlation between the ignition temperature of coal and the key parameters of pore structure was calculated by Pearson correlation coefficient method.The results show that with the increase of coal metamorphism,the adsorption capacity,specific surface area and pore volume of coal pores decrease first and then increase,the proportion of mesopores decreases gradually,and the proportion of macropores increases gradually.With the increase of coal metamorphism,the mass curve and weight loss rate curve of coal move to the high temperature zone,the ignition temperature gradually increases,and the spontaneous combustion ability decreases.The calculation results of Pearson correlation coefficient method show that the correlation coefficients between specific surface area,2-10 nm,10-20 nm and＞50 nm pore size ratio with ignition temperature are-0.853,-0.895,-0.910 and 0.921,respectively.The lower the content of macropores in coal,the higher the content of mesopores,the larger the specific surface area of coal,the more convenient the contact with oxygen,the lower the ignition temperature,and the stronger the spontaneous combustion ability of coal.Based on the results of the correlation coefficient method,a multiple linear regression model of coal pore structure and ignition temperature has been established.The correlation coefficient R2 between the predicted value and the real value is 0.853,and the fitting degree is high.The model can be used to predict the ignition temperature of coal.
Coal spontaneous combustionPore structureIgnition temperaturePearson correlation coefficient methodMultivariate linear regression model
万方数据
维普
