| 褐煤负压干燥动力学研究 |
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| 引用本文： | 荣令坤,印万忠,白春华,初茉.褐煤负压干燥动力学研究[J].中国矿业,2016,25(9). |
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| 作者姓名： | 荣令坤 印万忠 白春华 初茉 |
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| 作者单位： | 东北大学 资源与土木工程学院,东北大学 资源与土木工程学院,内蒙古科技大学 矿业工程学院,中国矿业大学北京 化学与环境工程学院;中国矿业大学北京 化学与环境工程学院 |
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| 基金项目： | 国家自然科学基金与神华集团有限责任公司联合资助项目 热提质对褐煤水分复吸特性的影响规律研究(U1261101) |
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| 摘 要： | 运用真空干燥箱,进行了不同压强、不同温度组合下的褐煤负压干燥试验研究,根据煤样含水率与干燥时间之间对映规律,提出一个简单数学模型,并引入干燥压强、干燥温度有关的系数k、m,得到褐煤负压干燥的动力学方程X=X_(0e)~(-kt)~m及干燥速率方程dX/dt=X_(0e)~(-kt)~m(-kmt~(m-1));另外,对干燥温度和压强对煤样终点含水率的影响进行了分析探讨,结果表明:使煤样水分能够彻底脱除的煤内孔隙半径均在纳米级,环境压强越小、温度越大,煤样最终含水率越小,说明煤中存在大量盲孔,小的外输能量(压力梯度、温度梯度)不足以使盲孔破裂。
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| 关 键 词： | 负压 动力学 褐煤 干燥 |
| 收稿时间： | 2015/3/24 0:00:00 |
| 修稿时间： | 2015/12/2 0:00:00 |
Study on the Drying Kinetics of lignite under Negative Pressure |
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| Rong Lingkun,Yin Wanzhong,Bai Chunhua and Chu Mo.Study on the Drying Kinetics of lignite under Negative Pressure[J].China Mining Magazine,2016,25(9). |
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| Authors: | Rong Lingkun Yin Wanzhong Bai Chunhua and Chu Mo |
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| Affiliation: | Institute of Resources and Civil Engineering,Northeastern University,Institute of Resources and Civil Engineering,Northeastern University,Institute of Mining Engineering,Inner Mongolia University of Science and Technology,Institute of Chemical and Environmental Engineering,China University of Mining and Technology |
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| Abstract: | Drying behaviors of lignite were studied with a vacuum drying oven under different pressures and temperatures in this study. A mathematical model was established according to the curves of the water content for different drying times to explain the kinetics of lignite drying. Further analysis explained the influence of pressure and temperature on final moisture content. The result suggests lower pressure and higher temperatures cause smaller final moisture contents, which indicates the existing of abundant blind holes in coal and the pressure and temperature gradients should be large enough to rupture the blind holes. |
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| Keywords: | negative pressure kinetics low-rank coal drying |
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