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Status of research on biogenic coalbed gas generation mechanisms 被引量:7
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作者 WANG, Aikuan QIN, Yong +1 位作者 WU, Yanyan WANG, Baowen 《Mining Science and Technology》 EI CAS 2010年第2期271-275,共5页
Biogenic coalbed gas,how it is generated and the geochemical characteristics of the gas are gaining global attention.The ways coalbed gas is generated,the status of research on the generation mechanism and the methods... Biogenic coalbed gas,how it is generated and the geochemical characteristics of the gas are gaining global attention.The ways coalbed gas is generated,the status of research on the generation mechanism and the methods of differentiating between biogenic gasses are discussed.The generation of biogenic coalbed methane is consistent with anaerobic fermentation theory.Commercial biogenic coalbed gas reservoirs are mainly generated by the process of CO2 reduction.The substrates used by the microbes living in the coal include organic compounds,CO2,H2 and acetate.The production ratio and quantity of biogenic coalbed methane depend on the exposed surface area,the solubility and permeability of the coal and the microbial concentration in the coal seam.It is generally believed that biogenic coalbed gas has a value for δ13C1<-5.5%,C1/C1+>0.95.The H isotope ratio is controlled by both the environment and the generation mechanism:typically δD1<-20%.Biogenic methane formed by CO2 reduction has more δD1 than that formed by acetate fermentation. 展开更多
关键词 coalbed gas biogenic coalbed gas secondary biogenic coalbed gas generation mechanism DISCRIMINATION
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Influences of different substrates on simulated lignite biogas production 被引量:1
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作者 Wang Aikuan Qin Yong Shao Pei 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第6期991-995,共5页
Using lignite samples, selected from Zhaotong basin, Yunnan province, China, as the parent source, simulating experiments of lignite biogas were conducted with 0.1% methanol, 5 mg/L yeast extract and 0.2 mol/L sodium ... Using lignite samples, selected from Zhaotong basin, Yunnan province, China, as the parent source, simulating experiments of lignite biogas were conducted with 0.1% methanol, 5 mg/L yeast extract and 0.2 mol/L sodium acetate solutions as the exogenous substance respectively. Variation characteristics of gas production, gas composition, VFA content and activity of coenzyme 1:42o in the simulated process were analyzed to discuss the influence of different substrates on lignite biogas generation. The results show that 0.1% methanol and 5 mg/L yeast extract solutions increase VFA contents in the biogas generation system (p 〈 0.05) and inhibit coenzyme F420 and methanogen activities significantly, so they decrease both gas amounts (p 〈 0.05) and CH4 contents (p 〈 0.05). 0.2 mol/L sodium acetate solution activates coenzyme F42o and methanogen activities and improves the efficiency of enzymatic reaction, so the gas quantity (p 〈 0.05) and the CH4 content (p 〈 0.01) increase significantly. Therefore, sodium acetate can be one kind of good exogenous substance for the generation of lignite biogenic gas. 展开更多
关键词 SubstrateLigniteBiogenic gasInfluence characteristics
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