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gas generation from coal: taking Jurassic coal in the Minhe Basin as an example

International Journal of Coal Science & Technology 2020年第3期7卷 611-622页

作者： Deliang Fu Guosheng Xu Li Ma Fu Yang Dan He Zhonghui Duan Yu Ma Key Laboratory of Coal Exploration and Comprehensive Utilization Ministry of Nature and ResourcesShaanxi Coal Geology Group Co.Ltd.Xi’an710021China College of Energy Chengdu University of TechnologyChengdu610059China Ningxia Institute of Geological Survey Yinchuan750000China

The gas generation features of coals at different maturities were studied by the anhydrous pyrolysis of Jurassic coal from the Minhe Basin in sealed gold tubes at 50 *** gas component yields(C1,C2,C3,i-C4,n-C4,i-C5,n-C5,and CO2);theδ13C of C1,C2,C3,and CO2;and the mass of the liquid hydrocarbons(C6+)were *** the basis of these data,the stage changes ofδ13C1,δ13C2,δ13C3,andδ13CO2 were *** diagrams ofδ13C1–δ13C2 vs ln(C1/C2)andδ13C2–δ13C1 vsδ13C3–δ13C2 were used to evaluate the gas generation features of the coal maturity *** the high maturity evolution stage(T>527.6°C at 2°C/h),the stage change ofδ13C1 and the CH4 yield are much higher than that of CO2,suggesting that high maturity coal could still generate *** T<455°C,CO2 is generated by breaking bonds between carbons and *** reaction between different sources of coke and water may be the reason for the complicated stage change inδ13CCO2 when the temperature was higher than 455°*** increasing pyrolysis temperature,δ13C1–δ13C2 vs ln(C1/C2)has four evolution stages corresponding to the early stage of breaking bonds between carbon and hetero atoms,the later stage of breaking bonds between carbon and hetero atoms,the cracking of C6+and coal demethylation,and the cracking of C2–***δ13C2–δ13C1 vsδ13C3–δ13C2 has three evolution stages corresponding to the breaking bonds between carbon and hetero atoms,demethylation and cracking of C6+,and cracking of C2–5.

关键词： Jurassic coal Pyrolysis gas generation δ13C Stage evolution

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Analysis of solid-liquid-gas interactions in landfilled municipal solid waste by a bio-hydro-mechanical coupled model

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Science China(Technological Sciences) 2012年第1期55卷 81-89页

作者： CHEN YunMin XU XiaoBing ZHAN LiangTong MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University Hangzhou 310058 China Tian Hua Architecture Planning Engineering Limited Shanghai 200233 China

Based on first-order kinetics of hydrolysis process, biodegradation of municipal solid waste （MSW） is assumed to obey a first-order decay equation which can take the direct effect of water content on biodegradation into account. Hydraulic model is an unsaturated-saturated flow model using mass conservation equations for fluids. Mechanical compression of MSW is ex- pressed by a stress-age coupled compression model. Through above models, a one-dimensional （I-D） bio-hydro-mechanical coupled model is established to analyze solid-liquid-gas interactions in landfilled MSW. Values of all the model parameters for current typical Chinese MSW are determined. Numerical analysis of a hypothetical waste sample in a closed system shows that gas pressure and gas concentration is extremely large which might cause severe gas explosion problem. Total gas production is about 267.0 m3 per wet ton of fresh wastes. For another hypothetical landfilled MSW layer, the coupled model predicts a dis- sipation of gas pressure during passive gas collection process. Annual gas production is large at the beginning of biodegradation, and then decreases with time. Surface settlement of the wastes increases quickly initially and then becomes stable with a compression strain of about 0.32 after 20 years.

关键词： municipal solid waste solid-liquid-gas interaction gas generation settlement

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The Impact of Aqueous Medium on gas Yields and Kinetic Behaviors of Hydrogen Isotope Fractionation during Organic Matter Thermal Degradation

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Acta Geologica Sinica(English Edition) 2011年第6期85卷 1466-1477页

作者： LU Shuangfang WANG Min XUE Haitao LI Jijun CHEN Fangwen XU Qingxia Northeast Petroleum University Heilongjiang Province 163318 China

In order to recognize the impact of aqueous medium on gas yields and the kinetic behaviors of hydrogen isotope fractionation during organic matter thermal degradation, the gold tube apparatus was used to conduct thermal simulation experiments by mixing the nC18 with the water of different properties and proportions. The yields of natural gas components, the relation among hydrogen isotope composition of each component and the experimental temperatures vs. heating rates have been obtained, and the results indicate that under the higher temperature conditions, the hydrous experiment has obvious impact on gas yields, such as when more water is added, higher amounts of hydrocarbon gas and H2 are yielded, and the existence of water obviously prolongs the temperature interval with the existence of heavy hydrocarbon gas. It also shows that the hydrogen isotope of hydrocarbon gas generated by the hydrous experiment is obviously lighter than that generated by the anhydrous experiment, and with the increasing amount of added water, the δD value of hydrocarbon gas gradually decreases. Compared with gas yields, the variation of δD value is more sensitive to aqueous medium in the thermal simulation experiment. However, compared with the amount of the added water, the aqueous medium property has smaller impact on the gas yields, which still shows the inherit effect on hydrogen isotope composition of aqueous medium. Through the model simulation and the isotope fractionation behavior analysis, it is validated that the hydrogen isotope fractionation process can be well described by the chemical kinetic model. The difference of reaction fraction of normal methane and D-containing methane is large, corresponding to the same activation energy. The content of normal methane is obviously higher in the part with lower activation energy, while the content of D-containing methane is higher in the part with higher activation energy. Therefore, it will result in larger hydrogen isotope fracti

关键词： hydrogen isotope fractionation chemical kinetics nC18 gas generation hydrous experiment

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Characterization of gases and solid residues from closed system pyrolysis of peat and coals at two heating rates

Characterization of gases and solid residues from closed sys...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Yi Duan~*,Baoxiang Wu,Jinxian He,Tao Sun Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,382 West Donggang Road,Lanzhou 730000,China

Closed system gold-tube pyrolysis experiments were performed on a peat and two coals(TY:R = 0.51%;SX:R-0.94%) at temperatures ranging from 337 to 600℃and a pressure of 50 MPa with heating rates of 2 and/or 20℃/*** reaction residues were analyzed *** and chemical and isotopic compositions of the generated gases were also *** three samples had similar thermal evolution *** increasing heating temperature,vitrinite reflectances(VR) of the residues increased linearly from 0.72%to 4.50%.This increase was lesser for the sample with a higher hydrocarbon generation potential and at faster heating *** compositions are dominated by CO and CH throughout the experimental *** gas and CH yields gradually increase with pyrolysis temperature for all *** carbon isotopic compositions of CH generated from the peat are lighter than those from the ***δC(CH) values exhibit a generic evolution pattern which the initial CH is isotopically heavy,then becomes lighter at moderate temperatures,and finally becomes heavier *** produced from the samples at low heating rate has higher transformation ratio than that at high heating rate under the same temperature,so tends to be isotopically heavy after pyrolysis temperature of more than 408℃.

关键词： Pyrolysis Coal Peat gas generation Vitrinite reflectance

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Quantitative Analysis of Greenhouse gas from Organic Refuse in Landfill

Quantitative Analysis of Greenhouse Gas from Organic Refuse ...

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The Second International ISCRAM Workshop on Information Systems for Crisis Response and Management

作者： Jun Yang Tao Huang 1.Institute of Environmental Science and Engineering,Southwest Jiaotong University, Chengdu 610031,China 2.1nstitute of Environmental and municipal Engineering,Lanzhou Jiaotong University, Lanzhou 730070,China

＜正＞Landfill site is one of the most important sources of greenhouse gas *** gas emitted from the landfill sites are important component of the total greenhouse gas emissions in the *** it is primarily important to predict the production of methane and carbon dioxide in order to control greenhouse gases emitted from *** on the mechanism of anaerobic degradation process of organic refuse,a detailed calculating method was proposed to work out the quantity of greenhouse gas emitted from *** result shows that, 0.3184,0.1192,0.2182 and 0.2297 kilograms of methane,and 0.3795,0.2264,0.5191 and 0.5439 kilograms of carbon dioxide are generated from the waste meat,plant,paper and wood（per kilogram refuse by wet weight） respectively during the anaerobic degradation process in *** conclusion accords closely with the experimental result from available *** on the conclusion,quantity of greenhouse emission from landfill can be predicted if organic component of refuse is measured.

关键词： Landfill Greenhouse gas generation Quantitative Analysis Control

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