A new method for accurate and rapid measurement of underground coal seam gas content
A new method for accurate and rapid measurement of underground coal seam gas content
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DOI：
10.1016/j.jngse.2015.08.020
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发表时间：
2015-09-01
影响因子：
--
通讯作者：
Jiang, Hai-na
中科院分区：
文献类型：
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作者：
Wang, Liang;Cheng, Long-biao;Jiang, Hai-na
煤层瓦斯含量是煤矿井下瓦斯灾害防治和瓦斯利用的基本参数之一。它也是煤层突出危险性评价和瓦斯抽采效果调查的重要指标，需要大量的测量工作，在煤矿井下必须进行大面积的测试。由于直接法中损失气量的计算误差较大，而间接法中用于计算瓦斯含量的瓦斯压力难以准确测量，因此准确测定瓦斯含量一直是一个难题。本文讨论了煤层瓦斯含量的主要组成及目前国内采用的测量方法，提出了一种基于同一地质单元内煤层瓦斯吸附与解吸特征的微小差距的煤层瓦斯含量测量新方法。该方法首先根据实验室测定的解吸特征，建立了合理的损失和残余瓦斯含量计算模型，然后可直接准确、快速地测定地下瓦斯含量。该方法工作量小，测量时间短，特别适用于井下单一煤层，需要大量测量的情况。从工程角度来看，该方法不仅可以快速确定煤层瓦斯含量，而且可以反映真实的瓦斯压力，满足大面积多点测量煤层瓦斯含量的要求，具有更高的可靠性和安全性。(C)2015 Elsevier B.V.版权所有。
Coal seam gas content is one of the basic parameters for gas disaster prevention and gas utilization in underground coal mines. It is also an important index for coal seam outburst danger evaluation and gas extraction effect investigation, which require a lot of measuring work and must be tested in large areas in underground coal mines. Due to the calculated error of the lost gas in the direct method and difficulties in accurately measuring the gas pressure used to calculate the gas content In the indirect method, the accurate determination of gas content remains a difficult problem. In this paper, the main component of gas content and current measurement methods used in China were discussed, and a new method of coal seam gas content measurement based on the small gap of gas adsorption and desorption characteristics of coal seams in the same geologic unit was proposed. In this new method, we first established a reasonable calculation model for the lost and residual gas contents based on laboratory measurements of desorption characteristics; an accurate and rapid determination of the underground gas content could then be directly obtained. This method requires a small workload and a short measuring time and is particularly applicable to a single underground coal seam with a demand for large quantity measurement. From an engineering perspective, this method not only can rapidly determine coal seam gas content but also can reflect the real gas pressure, satisfying the large area multi-point measurement of coal seam gas content with higher reliability and safety. (C) 2015 Elsevier B.V. All rights reserved.