| 论文简介 |
Analysis of the index gases of coal for the prevention of spontaneous combustion is of great importance for the enhancement of coal mine safety. Because the number of the unique gas components is great, the detection limits of the every component gas are low, and the requirement of safety is high, Fourier Transform Infrared Spectrometer (FTIRS) is presented to be used to analyze the index gases of coal in real time to monitor spontaneous combustion conditions. In this paper, both the instrument parameters and the analysis method are introduced at first by combining characteristics of the absorption spectra of the target analyte with the analysis requirements. For the analysis approach, sample preparation, feature variable extraction and analysis model building are taken into consideration. Next, more than ten sets of the gas mixture containing ten components (CH4, C2H6, C3H8, iso-C4H10, n-C4H10, C2H4, C3H6, C2H2, CO and CO2) are included and analyzed with a Spectrum Two FTIRS made by Perkin Elmer. The optical path length is 10 cm and the spectral resolution is set as 1cm-1. The testing results show that the detection limit of most analytes is less than 2×10-6. All the detection limits meet the monitoring requirements of coal spontaneous combustion in China, which means that FTIRS may be an ideal instrument and the analysis method used in this paper is sufficient for spontaneous combustion gas monitoring on-line and even in situ, since FTIRS has many advantages such as fast analysis, maintenance-free, good safety, and so on |
(创新港)
