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- Analysis on Road Support Under Loose and Soft Coal Bed 松软岩体下巷道的支护分析
- Mining Practice in Fully Mechanized Caving Coal Face of Hard Roof, Soft Coal, Soft Bottom, and Large Inclination Thick Coal Bed 坚硬顶板、软煤、软底大倾角较薄厚煤层综放工作面的开采实践
- Soft coal burns with more flames than hard coal. 烟煤燃烧时火焰较无烟煤多。
- soft coal bed 松软煤层
- But the pubic only has soft coal, no any char. 可公家只有烟煤,没有干炭。”
- It is a new way of the utilization of coal bed gas. 为井下抽放煤层气的利用提出了一条新的途径。
- We also supply blind coal and soft coal from China and Indonesia. 煤炭产品主要是无烟煤与有烟煤等。
- Coal Bed Methane Drilling and Completion Technology in Western Basin of U.S. 美国西部盆地煤层气钻井和完井技术。
- Preliminary research on structural law of coal bed beneath nappe in No. 对新集二矿推覆体下煤层构造规律进行了初步研究。
- Graphite deposit of Heye was formed by metamorphism of the Permian coal bed. 荷叶石墨矿是由二叠系煤层变质而成的石墨矿床,石墨与煤呈同层异矿关系。
- The combustion characters of petroleum coke were between those of soft coal and anthracite. 石油焦的燃烧特性处于烟煤和无烟煤之间。
- For measuring exactly on gas content of coal bed,required high core recov ery and short time to hoisting and loa ding. 为了准确测定煤层含气量,要求取心作业必须有高的收获率和尽可能短的提钻及出筒装罐时间。
- Finally great depth of burial, long time and higher temperature may metamorphose the lignite into soft coal or bituminous coal and in extreme cases, to hard coal or anthracite. 褐煤经长时间进一步的深埋以及较高的温度的作用,便可变成软煤或烟煤,再进一步变化,便成了硬煤或无烟煤。
- Several coal beds are developed in backswamp deposits. 河漫沼泽上发育多套煤层。
- In the meantime, measuring expansion energy of initial releasing gas of soft coal in Ma jia gou 0521 and absorb constant and remains gas content. 同时,对马家沟矿0521软分层的煤样进行了初始释放瓦斯膨胀能试验及吸附常数和残余瓦斯含量的测定。
- The existing mine gas in coal bed occurs mostly in the free state,the adsorption state and the dissolved state. 瓦斯气体在煤储层中的赋存状态主要有游离态、吸附态和溶解态。
- The project takes pyrogenic dry distillation gas of soft coal in continuous retort as the fuel gas and produces ferroalloy coke and crude tar oil. 本项目是以烟煤在连续炭化炉中热解的干馏煤气作为城市燃气,同时付产铁合金焦和粗焦油。
- The hydro-geological parameters of Triassic age coal bed 3 of Dongtan Coal Mine be calculated with it. 利用相关方程求出了全东滩矿3煤砂岩顶板含水层的水文地质参数。
- Roadway heading is the forerunner for clearly knowing coal bed geological conditions. 掘进巷道是全面、准确了解矿井煤层地质条件的先导。
- Benzene Clear, colourless, flammable volatile spirit. It is narotic and toxic, obtained when soft coal is heated in the absence of air, used as a medium for carrying gravure inks. 是透明,无色,可燃烧,挥发性酒精。它具麻醉性和有毒。是软煤在无空气下加热生成。用作凹版印刷油墨的介质。