Numerical simulation of the methane adsorption capacity in middle-rank coal

doi:10.16085/j.issn.1000-6613.2019-1701

Abstract

Abstract:

A set of four-variable mathematical equations has been established from a series of three-variable mathematical equations to predict the methane adsorption capacity in middle-rank coals (the maximum reflectivity of vitrinite R_0,max=0.65%—2.50%) under the temperature (20—50℃) or the buried depth shallower than 1200 meters.The average relative error of this mathematical transformation is between 7.28% and 9.49%. There is a specific Software Works to deal with the numerical simulation of methane adsorption capacity in middle-rank coal. As long as five pieces of measured data: the maximum reflectivity of vitrinite R_0,max, temperature gradient, pressure gradient, buried depth and the temperature of constant temperature layer, are inputted, the values of the methane adsorption capacity V, parameters (A、B、Δ、β) can be calculated and outputted. Under certain maximum reflectivity of vitrinite R_0,max value, two drawing of “curved surface of adsorption capacity-temperature-pressure” and “curve of adsorption capacity-buried depth” can be obtained.

Key words: middle-rank coal, maximum reflectivity of vitrinite, temperature, pressure, adsorption capacity

摘要：

根据表征中煤级煤（镜质组最大反射率R_o,max=0.65%～2.50%）的系列等温吸附（20℃、30℃、40℃和50℃这4个实测温度）“煤变质程度-压力-吸附量”的三变量数学方程，建立一组“煤变质程度-温度-压力-吸附量”这4个共同存在并相互影响的四变量数学方程。该四变量数学方程用于预测1200m以浅的中煤级煤甲烷饱和吸附量。这种数学转换的平均相对误差在7.28%～9.49%之间。有处理中煤级煤甲烷饱和吸附量的数值模拟的软件著作。只要将5个实测数据：镜质组最大反射率R_0,max、温度梯度、压力梯度、埋深和恒温层温度，输入相应可编辑文本框中，就可以输出5个值：饱和吸附量V、温度-压力-吸附量方程中的参数（A、B、Δ、β）。还可以输出在自己感兴趣的镜质组最大反射率R_0,max、温度梯度、压力梯度、埋深和恒温层温度下，“R_0,max值时温压吸附曲面”和“吸附量随埋深变化图”。

关键词: 中煤级煤, 镜质组最大反射率, 温度, 压力, 吸附量

CLC Number:

TD712

Xuemei ZHANG, Qinghua MA, Jingyuan HAO, Dong LI. Numerical simulation of the methane adsorption capacity in middle-rank coal[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 162-167.

张学梅, 马青华, 郝静远, 李东. 中煤级煤甲烷饱和吸附量的数值模拟计算[J]. 化工进展, 2020, 39(S2): 162-167.

Figures/Tables 7

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