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Compositional shift of residual gas during desorption from anthracite and its influencing factors

机译：无烟煤解吸过程中残余气体的组成位移及其影响因素。

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Minimal attention has been paid to the factors influencing compositional shifts in residual gas during the desorption process from coal. Two anthracite samples were collected from the Zhina Coalfield in China to study compositional shifts in residual gas. The entire desorption process was divided into five stages, comprising thirteen substages. Low-pressure N-2 adsorption tests showed that mesopore and macropore volumes and surface areas increased continuously as the particle size of pulverized coal decreased. The increase in porosity with decreasing particle size is attributable to the existence of many closed pores in the coal. The residual gas contents of the two samples were 8.34 and 7.22 cm(3)/g ("as-received" basis). The desorption rate of residual gas gradually declined with time in a 95 degrees C thermostatic water bath. Measured concentrations of the chemical gas components CH4, C2+, N-2, and CO2 show distinct variations during the desorption process. The factors influencing compositional shifts in residual gas are ambient temperature, heating time, and pulverized coal particle size. N-2 concentrations were highest during the pulverization process and relatively low during the heating process, which is in contrast with the variation trend of C2+ and CO2 concentrations. CH4 and N-2 concentrations decreased steadily with heating time in a 95 degrees C thermostatic water bath, whereas C2+ and CO2 concentrations showed the opposite trend. This is because C2+ and CO2 have stronger adsorption affinities than CH4 and N-2 do, and a large proportion of N-2 and CH4 could desorb preferentially from coal. C2+ and CO2 concentrations increased with decreasing coal particle size, whereas CH4 and N-2 concentrations showed the opposite trend. Relatively high concentrations of CO2 and C2+ in closed pores may be related to the sealing effect of closed pores, which prevents the escape of early generated products. In addition, increased pressure in closed coal pores should retard C2+ cracking at high temperatures. Thus, it is necessary to focus on the compositional shifts in residual gas and its influencing factors. Failure to account for these aspects may lead to typical analytical errors, which will propagate in the assessment of CH4 abundance in coalbeds.
机译：在从煤中解吸过程中，对残留气体组成变化的影响因素的关注很少。从中国的智纳煤田收集了两个无烟煤样品，以研究残留气体的组成变化。整个解吸过程分为五个阶段，包括十三个子阶段。低压N-2吸附试验表明，随着煤粉粒径的减小，中孔和大孔的体积和表面积不断增加。孔隙度随粒度减小而增加是由于煤中存在许多封闭的孔隙。两个样品的残留气体含量分别为8.34和7.22 cm（3）/ g（“按原样”计算）。在95℃的恒温水浴中，残留气体的解吸速率随时间逐渐降低。在解吸过程中，化学气体组分CH4，C2 +，N-2和CO2的测量浓度显示出明显的变化。影响残留气体组成变化的因素是环境温度，加热时间和煤粉粒度。 N-2浓度在粉碎过程中最高，而在加热过程中相对较低，这与C2 +和CO2浓度的变化趋势相反。在95℃的恒温水浴中，CH4和N-2的浓度随加热时间稳定下降，而C2 +和CO2的浓度却呈现相反的趋势。这是因为C2 +和CO2具有比CH4和N-2更高的吸附亲和力，并且大部分N-2和CH4可以优先从煤中脱附。 C2 +和CO2浓度随煤颗粒尺寸的减小而增加，而CH4和N-2浓度则呈相反的趋势。封闭孔中相对较高的CO2和C2 +浓度可能与封闭孔的密封效果有关，这会阻止早期生成的产品逸出。另外，在封闭的煤孔中增加的压力将阻止高温下的C2 +裂解。因此，有必要关注残余气体的组成变化及其影响因素。不考虑这些方面可能导致典型的分析误差，这些误差会在煤层气中CH4丰度的评估中传播。

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