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Numerical simulation of excess-enthalpy combustion flame propagation of coal mine methane in ceramic foam

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Mining Science and Technology 2010年第2期20卷 248-253页

作者： SONG, Zhengchang LIN, Boquan school of mechanical engineering china university of mining & technologyxuzhou 221008china school of safety engineering china university of mining & technologyxuzhou 221008china

Based on the assumption of a local non-equilibrium of heat transfer between a solid matrix and gas,a mathematic model of coal mine methane combustion in a porous medium was established,as well the solid-gas boundary *** simulated numerically the flame propagation *** results show that the flame velocity in ceramic foam is higher than that of free laminar flows;the maximum flame velocity depends on the combined effects of a radiation extinction coefficient and convection heat transfer in ceramic foam and rises with an increase in the chemical equivalent *** radiation extinction coefficient cannot be used alone to determine the heat regeneration effects in the design of ceramic foam burners.

关键词： combustion ceramic foam coal mine methane numerical simulation flame propagation

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Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

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International Journal of coal Science & Technology 2021年第6期8卷 1400-1410页

作者： Minghao Yi Liang Wang Congmeng Hao Qingquan Liu Zhenyang Wang Key Laboratory of coal methane and Fire Control Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina National Engineering Research Center for coal Gas Control China University of Mining and TechnologyXuzhou 221116JiangsuChina School of Safety Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

The purpose of underground methane drainage technology is to prevent methane disasters and enable the efficient use of coal mine methane(CMM),and the sealing depth is a key factor that affects the performance of underground methane *** this work,the layouts of in-seam and crossing boreholes are considered to analyze the stress distribution and failure characteristics of roadway surrounding rock through a numerical simulation and field stress investigation to determine a reasonable sealing *** results show that the depths of the plastic and elastic zones in two experimental coal mines are 16 and 20 m *** sealing minimizes the air leakage through the fractures around the roadway when the sealing material covers the failure and plastic zones,and the field test results for CMM drainage at different sealing depths indicate that the CMM drainage efficiency increases with increasing sealing depth but does not change once the sealing depth exceeds the plastic ***,sealing in the high-permeability roadway surrounding rock does not have a strong influence on the borehole sealing *** these findings,a new CMM drainage system for key sealing in the low-permeability zone was developed that is effective for improving the CMM drainage efficiency and prolonging the high-concentration CMM drainage *** proposed approach offers a valuable quantitative analysis method for selecting the optimum sealing parameters for underground methane drainage,thereby improving considerably the drainage and utilization rates of CMM.

关键词： coal mine methane methane drainage Borehole sealing Mining safety methane utilization

Application of long-reach directional drilling boreholes for gas drainage of adjacent seams in coal mines with severe geological conditions

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International Journal of coal Science & Technology 2022年第6期9卷 75-88页

作者： Grzegorz Lesniak Daniel JBrunner Tomasz Topòr Malgorzata Slota-Valim Renata Cicha-Szot Bartlomiej Jura Jacek Skiba Arnold Przystolik Ben Lyddall Grzegorz Plonka Oil and Gas Institute-National Research Institute Lubicz 25A31-503 KrakówPoland REI Drilling INC.250 West Berger Lane84107 Salt Lake CityUTUSA Central Mining Institute 40-166 KatowicePoland Polish Mining Group(PGG) Powstańców 3040-039 KatowicePoland

This study aimed to demonstrate the application of Long Reach Directionally Drilled Boreholes(LRDD)for gas drainage of adjacent seams before and during the longwall face operations of low permeability-high gas content coals Staszic-Wujek Hard coal mine in the Upper Silesia coal Basin(Poland).Five LRDD Boreholes(TM1a-TM5)with a length of 300 and 400 m were located over coal seam 501 in the fractured zone and monitored over six months of longwall face *** Boreholes were combined with Cross-Measured *** characterization and geological modeling supported the results obtained from gas *** drainage efficiency of LRDD Boreholes was the approxi-mately 70%level,while conventional Cross-Measured Boreholes were only 30%.The highest goaf gas quality(94%methane concentration)was reported for TM4,placed at an average elevation of 41 m above coal seam *** highest goaf gas production(average 6.2 m^(3)/min)was reported for LRDD Borehole *** borehole was placed within the fracture zone(average elevation of 24.4 m)and drilled through the sandstone lithotype with the best reservoir properties,enhancing drainage *** Boreholes TM2 and TM4 achieved similar *** three LRDD Boreholes were drilled close to the maximum principal horizontal stress direction,providing borehole stability during *** lowest goaf gas production was reported for LRDD Boreholes TM1a and *** Boreholes were placed in the rubble zone.

关键词： coal mine methane methane control strategy In-seam horizontal boreholes Long reach directionally

Prevention of explosion in coal mine and management of coal mine gas

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Journal of coal Science & Engineering(China) 2009年第2期15卷 215-219页

作者： FURUKAWA Hirofumi TOMITA Shinji Japan coal Energy Center (Jcoal)

There are many problems in terms of safe coal production and the sound developmentof the coal *** the intensification and increasing efficiencyof coal production and the conducting of mining operations at deeper and more remoteareas of mines,the efficient recovery and utilization of coal mine methane:(CMM) is animportant issue in improving and stabilizing the productivity in the coal mining industry withhigh levels of gas,where the incidence of gas outbursts is *** plan to studyvarious aspects of the development of production technology and characteristics of themine *** is to establish the technology for highly efficient coproduction coal and gasoperation *** a result,the productivity at the coal mine face will increase due to thereduction in gas emissions in the mining *** use of recovered gas can be expectedto reduce global warming by reducing the amount of coal mine methane gas emissionin the air.

关键词： coal mine methane coproduction coal and gas global warming

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Optimizing Profitability and Risk Management of CMM Power Projects: The Green Gas International Model

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Optimizing Profitability and Risk Management of CMM Power Pr...

Deep levels,transport and THz emission properties of SiGe/Si quantum-well structures

2005第五届国际煤层气论坛暨第一届中日煤炭技术研讨会“国际甲烷市场化合作计划”中国地区会议

作者： Roland Mader Chris Norval Karl Schultz Green Gas International

This paper deals with the economics of coal mine methane (CMM) fired powerprojects. Starting with a description of a typical CMM power project, IRR (internal rate ofreturn on investment) is introduced as a measure to calculate a project’s profitability. Within IRR calculations, numerous variables have to be taken into account, some which need to be estimated. The closer these estimations get to reality, the smaller will be the differencebetween projected and actual IRR and the lower will hence be the risk. The most relevant ofthese variables are discussed, and their relevance is analyzed勿means of a sensitivityanalysis. A key finding of the paper is that system availability levels have much greaterimpact on project IRRs than capital cost considerations, and this should be integrated indecisions on system design and operations. The paper also offers with proposals on how todeal with inevitable imponderables and how to improve risk management towards ongoingIRR. It concludes with a discussion of the Green Gas International business model and howit applies the lessons learned from this paper in China.

关键词： coal mine methane Power Project Internal Rate of Return Risk Management Business Models

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中国科学:技术科学 2010年第4期40卷 426-426页

作者： I.V.ANTONOVA M.S.KAGAN E.P.NEUSTROEV S.A.SMAGULOVA Institute of Semiconductor Physics Russian Academy of Sciences Institute of Radioengineering and Electronics Russian Academy of Sciences Yakutsk State University

In coal mines in such countries as China and Russia,most of the coal mine methane(CMM) generated during mining is emitted to the atmosphere without any effective usage,because the methane concentration of CMM is relatively low and not allowed to be used as fuel for safety *** is one of the greenhouse ***,if it becomes possible to concentrate CMM to an acceptable level for use as fuel,this will greatly contribute to reduction of greenhouse gas *** the aim of gaining approval as a greenhouse gas emission reduction of the clean development mechanism(CDM) or joint implementation(JI) project,we developed a CMM concentration system to apply the vacuum pressure swing adsorption(VPSA) technology using a high methane-selective adsorbent by Osaka Gas Co.,*** pilot-scale plant of a CMM concentration system was installed in a coal mine in Fuxin City in the northeastern China and a demonstration test was commenced in December *** the result,the pilot-scale plant successfully concentrated the raw material gas with a methane concentration of 21%and a flow rate of 1000 Nm3/h to 48%,which exceeded the target of the methane concentration performance(a 25%increase) .The methane recovery rate reached 93%.

关键词： methane concentration coal mine methane vacuum pressure swing adsorption greenhouse gas emissions