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Disaster prediction of coal mine gas based on data mining

Journal of coal Science & Engineering(China) 2008年第3期14卷 458-463页

作者：邵良杉付贵祥 Liaoning Technical University Fuxin 123000China Kailuan Group Company Tangshan 063018China

The technique of data mining was provided to predict gas disaster in view of the characteristics of coal mine gas disaster and feature knowledge based on gas disaster. The rough set theory was used to establish data mining model of gas disaster prediction, and rough set attributes relations was discussed in prediction model of gas disaster to supplement the shortages of rough intensive reduction method by using information en- tropy *** effectiveness and practicality of data mining technology in the prediction of gas disaster is confirmed through practical application.

关键词： disaster prediction coal mine gas data mining rough set theory

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Studies on bio-oxidation of coal mine gas by a biofilter

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Journal of coal Science & Engineering(China) 2010年第4期16卷 367-374页

作者： YU Hai-xia MIN Hang LUE Zhen-mei Hangzhou Environmental Monitoring Center Station Hangzhou 310007 China College of Life Science Zhejiang University Hangzhou 310058 China

A new biofilter technology was used to control the methane concentration in the coal mine. The results indicate that the biofilter achieves a steady methane removal capacity of 1 470 mg/（Loh） after 30 days start-up. More than 90% of the methane can be removed with an empty bed retention time （EBRT） of 5.6 min when the inlet concentration of methane （IMC） is lower than 70 mg/L （10%, V/V） and about 80% when IMC is at 105 mg/L （15%, V/V）. The biofilter is still a reliable method to control methane concentration as an auxiliary means to boost coal mine production safety together with aggrandized ventilation and drainage technologies, even though the removal efficiency of methane is not very satisfactory with a high IMC （〉10%） or a short EBRT （〈3.8 min）.

关键词： biofilter bio-oxidation coal mine gas methane methanotroph

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Research on the sensitivity for the coal mine gas concentration detection by laser spectrum absorption

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Journal of coal Science & Engineering(China) 2007年第3期13卷 370-372页

作者：周孟然李振壁 Department of Electric Engineering Anhui University of Science and Technology Huainan 232001 China

Because of the former gas chemistry examination method defects, tunable diode laser absorption spectrum technology （TDLAS） was used. It used an isolated absorption spectrum of the gas molecule to measure the gas absorption spectrum in order to distinguish the gas conveniently. The second harmonic （20 was measured in this system. Due to the fact which the harmonious signal is proportional to the concentration of the absorption gas, the gas concentration may be obtained through examining harmonious signal. The theoretical analysis and the experimental result indicate that under the same level of pressure, survey with the signal-to-noise ratio（SNR） of 2fsignal increases the accuracy by one order of magnitude and may reach 10 ^-3 and the sensitivity may reach the 10^-6 level compared to that of direct absorption. 5% methane density and a 30 cm absorption cell were used in the experiment. It has several advantages including high sensitivity, best resolution, and faster response and so on. The gas concentration monitoring of coal mine may be accomplished.

关键词： coal mine gas spectral absorption second harmonic (2f) signal-to-noise ratio

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A study of laboratory testing and calculation methods for coal sorption isotherms

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Journal of coal Science & Engineering(China) 2013年第2期19卷 193-202页

作者： Lei ZHANG Ting-Xiang REN Nai AZIZ Faculty of Engineering University of Wollongong Wollongong 2500 Australia

Measurement of the volume of gas adsorbed per unit mass of coal with increasing pressure at a constant temperature produces an isotherm that describes the gas storage capacity of this type of coal. The accurate testing and interpretation of coal sorption isotherm plays an important role in the areas of coal mine methane drainage, coalbed methane （CBM） reservoir resource assessment, enhanced coalbed methane （ECBM） recovery, as well as the carbon dioxide （CO2） sequestration in deep coal seams or similar geological formations. Different coal sorption isotherm testing apparatus and associated calculation methods are critically reviewed and presented in this paper. These include both volumetric and gravimetric based methods, as well as experimental sorption tests with confining stress and direction sorption methods. The volumetric techniques utilise experimental apparatus with sample cell and injection pump and that with both sample cell and reference cell. Whilst the gravimetric approachesinclude methods with sample cell and suspension magnetic balance and that with both sample cell and reference cell. Different testing methods are compared and discussed in this study. A unique in-house-built coal sorption isotherm testing apparatus at the University of Wollongong was presented together with the calculation method, procedures and experimental results. The isotherm results can be calculated by both Soave-Redlich-Kwong （SRK） equation and calibration cure methods which can be used directly to convert the volume of adsorbed gas in different test conditions to standard condition （NTP）.

关键词： sorption isotherm coalbed methane coal mine gas apparatus calculation method volumetric method gravimetric method

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The intensity calculation of the gas absorption line by multi-line Voigt fitting

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Journal of coal Science & Engineering(China) 2008年第4期14卷 534-537页

作者：周孟然李振璧钟鸣宇何刚 School of Electrical & Information Engineering Anhui University of Science and TechnologyAnhui 232001China

Adopted the distribution feedback type （DFB） laser to measure the coal mine gas methane, according to the methane located 1.6 μm nearby 2v3 with a R9 direct absorption spectrum, attraction wire intensity of each line was calculated through the multi-line Voigt fitting. The experimental result indicates that in the obtained four attraction recover of wire, the maximum deviation is 2.7%, and the minimum deviation is 0.02%, other results are all in experimental error scope. This research method may apply in the spectrum survey methane gas density, it has characteristics including high precision, strong selectivity, fast response and so on.

关键词： coal mine gas absorption line intensity multi-line Voigt fitting spectrum survey

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