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Open Access Spectral analysis of alkane gases of coal spontaneous combustion with a small quantity sample

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The alkane gases absorption spectra of coal spontaneous combustion index gases are seriously overlapped,and the quantitative analysis of absorption spectra requires a large amount of samples for calibration.Due to these issues,the absorption spectrogram of methane,ethane,propane,isobutene and n-butane were investigated,and the nonlinear characteristic between spectral line and gas concentration was analyzed.The results show that the partial spectral line of absorption spectra possesses favorable degree of linearity.The characteristic variable was extracted using improved Tikhonov regularization method.The test results of the five kinds of alkanes were given by establishing analysis model.More than 20 groups of samples achieved the gases high accuracy in online analysis using the Tensor 27 spectrograph whose optical distance is 10 cm,the number of scanning times are eight times,spectral resolution is 1 cm-1.The resolution ratio of all gases is better than 2×10-6.The gas resolution ratio meets the test requirements of coal spontaneous combustion.
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Keywords: Fourier transform infrared spectroscopy; index gas; spectral analysis; spontaneous combustion

Document Type: Research Article

Publication date: February 15, 2015

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