A study of laboratory testing and calculation methods for coal sorption isotherms

Lei ZHANG; Ting-Xiang REN; Naj AZIZ

摘要

Measurement of the volume of gas adsorbed per unit mass of coal with increasing pressure at a constant temperature produces an isotherm that describes the gas storage capacity of this type of coal.The accurate testing and interpretation of coal sorption isotherm plays an important role in the areas of coal mine methane drainage,coalbed methane (CBM) reservoir resource assessment,enhanced coalbed methane (ECBM) recovery,as well as the carbon dioxide (CO2) sequestration in deep coal seams or similar geological formations.Different coal sorption isotherm testing apparatus and associated calculation methods are critically reviewed and presented in this paper.These include both volumetric and gravimetric based methods,as well as experimental sorption tests with confining stress and direction sorption methods.The volumetric techniques utilise experimental apparatus with sample cell and injection pump and that with both sample cell and reference cell.Whilst the gravimetric approachesinclude methods with sample cell and suspension magnetic balance and that with both sample cell and reference cell.Different testing methods are compared and discussed in this study.A unique in-house-built coal sorption isotherm testing apparatus at the University of Wollongong was presented together with the calculation method,procedures and experimental results.The isotherm results can be calculated by both Soave-Redlich-Kwong (SRK) equation and calibration cure methods which can be used directly to convert the volume of adsorbed gas in different test conditions to standard condition (NTP).

机译：测量每单位煤量的气体的体积随着恒定温度的增加而产生的等温物，其描述了这种煤炭的气体储存能力。煤吸附等温线的准确测试和解释在该领域起着重要作用煤矿甲烷排水，煤层甲烷（CBM）储层资源评估，增强煤层甲烷（ECBM）回收，以及深煤层中的二氧化碳（CO2）封存，或者在深煤层或类似地质形成中的封存。不同的煤吸附等温试验装置和相关本文综述并介绍了计算方法。该方法包括基于体积和重量的方法，以及具有限制应力和方向吸附方法的实验吸附试验。体积技术利用具有样品电池和喷射泵的实验装置，并且具有两者样本单元和参考单元。尽可重量方法具有样品细胞和悬浮液平衡的物质和悬浮液和参考细胞。比较测试方法，并在本研究中讨论。卧龙岗大学的独特内置煤吸附等温试验装置与计算方法，程序和实验结果。等温结果可以通过Soave-Redlich-kwong（SRK）方程和校准固化方法来计算，其可以直接用于将吸附气体的体积转换为标准条件（ ntp）。

A study of laboratory testing and calculation methods for coal sorption isotherms

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