Quantitative Spectrum Analysis of Characteristic Gases of Spontaneous Combustion Coal
LIANG Yun-tao1, TANG Xiao-jun2*, LUO Hai-zhu1, SUN Yong1
1. State Key Laboratory of Coal Mine Safety Technology, Shenyang Branch of China Coal Research Institute, Shenyang 110016, China 2. State Key Laboratory of Electrical Insulation & Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Abstract：Aimed at the characteristics of spontaneous combustion gas such as a variety of gases, lou limit of detection, and critical requirement of safety, Fourier transform infrared (FTIR) spectral analysis is presented to analyze characteristic gases of spontaneous combustion. In this paper, analysis method is introduced at first by combing characteristics of absorption spectra of analyte and analysis requirement. Parameter setting method, sample preparation, feature variable abstract and analysis model building are taken into consideration. The methods of sample preparation, feature abstraction and analysis model are introduced in detail. And then, eleven kinds of gases were tested with Tensor 27 spectrometer. CH4, C2H6, C3H8, iC4H10, nC4H10, C2H4, C3H6, C3H2, SF6, CO and CO2 were included. The optical path length was 10 cm while the spectra resolution was set as 1 cm-1. The testing results show that the detection limit of all analytes is less than 2×10-6. All the detection limits fit the measurement requirement of spontaneous combustion gas, which means that FTIR may be an ideal instrument and the analysis method used in this paper is competent for spontaneous combustion gas measurement on line.
Key words：Fourier transform infrared spectrometer;Spectral analysis;Spontaneous combustion;Characteristic gas
