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计算机模糊模拟在井底煤仓容量核定中的应用
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作者 卢宗华 《山东科技大学学报(自然科学版)》 CAS 2000年第4期66-68,共3页
以计算机模糊模拟(CFS)为基础,以煤矿井底煤仓容量的核定为案例,介绍了计算机模糊模拟的优点,这为计算机模拟方法的应用又开辟了一条新的途径。
关键词 计算机模糊模拟 提煤量
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GY—Ⅱ压磁称重仪的实际应用 被引量:1
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作者 刘建新 王家峰 《煤矿机械》 北大核心 2002年第3期64-64,共1页
阐述了GY— Ⅱ 压磁称重仪的特点和工作原理 。
关键词 压磁称重仪 提煤量 传感器 工作原理 绞车
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Applicability of surface directional wells for upper Silesia Basin coal seams' drainage ahead of mining 被引量:1
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作者 Jura Bartlomiej Skiba Jacek Wierzbinski Krystian 《International Journal of Mining Science and Technology》 SCIE EI 2014年第3期353-362,共10页
Methods of exploitation drainage, which is presently applied in polish hard coal mines in Upper Silesian Coal Basin(Poland), are not effective enough, high risk of methane hazard can be observed, and production capaci... Methods of exploitation drainage, which is presently applied in polish hard coal mines in Upper Silesian Coal Basin(Poland), are not effective enough, high risk of methane hazard can be observed, and production capacity of the mining plant is not fully used. Methane hazard, which may occur during planned coal exploitation, is presented in this paper. Following parameters are taken into consideration in the forecasts: coal extraction parameters, geological and mining conditions, deposit's methane saturation degree and impact of coal exploitation on the degasification coefficient of the seams, which are under the influence of relaxation zone. This paper presents the results of the analysis aiming to verify applicability of drainage ahead of mining of the coal seams by using surface directional wells. Based on the collected data(coal seams' structural maps, profiles of the exploratory wells, geological cross-sections), the lab tests of drilling cores and direct wells' tests, static model of the deposit was constructed and suitable grid of directional wells from the surface was designed. Comparison of forecasted methane emission volume between the two methods is investigated. The results indicated the necessity of performing appropriate deposit's stimulations in order to increase effectiveness of drainage ahead of mining. 展开更多
关键词 COAL Methane drainage Methane hazard forecasting Numerical modeling Deposit simulation
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Prediction of methane emissions during the extraction of close-to-roof layer of a seam of large thickness
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作者 KRAUSE Eugeniusz QU Xian-chao 《Journal of Coal Science & Engineering(China)》 2012年第4期337-343,共7页
Prediction of methane emissions at the stage of longwall planning constitutes the basis for the determination of the appropriate method and parameters of ventilation and selection of prevention means including the met... Prediction of methane emissions at the stage of longwall planning constitutes the basis for the determination of the appropriate method and parameters of ventilation and selection of prevention means including the methane drainage technol- ogy. The growth of methane saturation of coal seams with the extraction depth, with simultaneously increasing output concen- tration, contributes to the increase of the quantity of methane emitted into longwall areas. The subject matter of the article has been directed at the predicted quantity of methane emissions into planned longwalls with roof caving in the layer of seams adjacent to the roof of large thickness. The performed prognostic calculations of methane emissions into the longwall working were referred to two sources, i.e. methane liberated during coal mining by means of a cutter-loader and methane originating from the degasification of the floor layer destressed by the longwall conducted in the close-to-roof layer. The calculations of predictions allow to refer to the planned longwall, on account of the emitting methane, with possible and safe output quantity. Planning of extraction in the close-to-roof layer of a seam of large thickness with roof caving is especially important in con- ditions of increasing methane saturation with the depth of deposition and should be preceded by a prognostic analysis for de- termining the extraction possibilities of the planned longwall. 展开更多
关键词 methane emission EXTRACTION close-to-roof layer coal seam large thickness LONGWALL PREDICTION
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新集二矿主井箕斗技术改造可行性 被引量:1
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作者 王修宏 童树义 《矿山机械》 北大核心 2001年第6期89-90,共2页
关键词 矿井 箕斗 技术改造 休止时间 提煤量 升系统 循环时间
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Extraction of coal-tar pitch using NMP/ILs mixed solvents 被引量:3
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作者 HUANG Jin Cheng LI Chun Shan +4 位作者 BAI Lu NIE Yi WANG Er Qiang HE Yu Jian ZHANG Suo Jiang 《Science China Chemistry》 SCIE EI CAS 2014年第12期1760-1765,共6页
Coal-tar pitch(CP)is a promising carbon raw material for producing needle coke,carbon fiber etc.During processing,the H/C ratio,ash content,and quinoline insoluble(QI)in the CP are the key factors that influence the m... Coal-tar pitch(CP)is a promising carbon raw material for producing needle coke,carbon fiber etc.During processing,the H/C ratio,ash content,and quinoline insoluble(QI)in the CP are the key factors that influence the material preparation.In this study,NMP was selected to extract CP first;then[BMIM]Cl/NMP mixed solvent was used;and finally a series of ionic liquids(ILs)mixtures with NMP were developed for the extraction of CP to obtain the refined pitch.The extracts were analyzed via elemental analysis,TGA,FT-IR,and 13C-NMR.Results indicate that different NMP/IL mass ratios or different kinds of ILs have impact on the extraction yield.The relationship of the hydrogen to carbon(H/C)ratio changed with different solvents and QI extracts were obtained.Results showed that the H/C ratios changed little between NMP extracts and could be adjusted by changing the NMP/ILs mass ratio or using different ILs.The extracts are suitable for preparation mesophase pitch because of no ash content,low QI,and appropriate H/C ratios.As a result,NMP can be used to refine pitch.In addition,[BMIM]Cl is good mixed with NMP for CP extraction,because it can obtain a relatively high yield under the same extraction conditions. 展开更多
关键词 coal-tar pitch ionic liquid NMP EXTRACTION H/C
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