Catastrophic cases of methane explosion during exploratory drilling within the Bełchatów ortholignite deposit have led to testing for methane in other Polish ortholignite mining areas, as well as in the Złoczew deposit, where it is planned to begin mining operations. Initial tests have shown Złoczew lignite to have the highest methane content among the Polish deposits so far studied, comparable with lignite from the Bełchatów deposit, with a methane capacity in excess of 2.5 dcm³/kg at a pressure of 10 bar. Based on the computed values of the Langmuir constant, a determination was made of the quantity of methane that can be desorbed from a pressure of 10 bar to 1 bar, as well as the residual methane content. For all of the tested samples, the residual methane content is between 30 and 50% of the sorption capacity at a pressure of 10 bar. The thermal sorption equations were used to compute values of the limiting isosteric heat of adsorption. Higher values of the heat of adsorption at zero surface capacity may indicate the presence of a small quantity of micro-pores. In the case of the samples with the highest sorption capacity, the limiting isosteric heats of adsorption are low, indicating a low proportion of micro-pores in the lignite. This was confirmed by tests of nitrogen adsorption at 77 K. The proportion of micro-pores in the studied lignites is 2–3%, while the dominant pore fraction is the meso-pores, which in lignite from the Złoczew and Bełchatów deposits account for 50–66% of total pores. It is concluded that the significant adsorption of methane in the ortholignite occurs chiefly in meso-pores because of compression of the gas under increased orogenic pressure. A link is made between the higher methane-bearing capacity of the ortholignite deposits and the degree of gelification of the huminite components, based on simple statistical correlations between the methane sorption capacity and the content of humic gelified maceral. The results concerning methane sorption in lignite from the Złoczew deposit have enabled a preliminary classification of the methane-bearing capacity of Polish ortholignite deposits, which may also be of significance for similar deposits in other countries.

中文翻译：

---

Złoczew褐煤中甲烷的存在评估：与波兰其他褐煤矿床的比较

Bełchatów斜长石矿床勘探钻探中发生甲烷爆炸的灾难性事件，导致在其他波兰斜长石矿区以及计划开始开采作业的Złoczew矿床测试甲烷。初步测试显示，到目前为止，在研究的波兰矿床中Złoczew褐煤的甲烷含量最高，可与Bełchatów矿床的褐煤媲美，甲烷容量超过2.5 dcm ^3。/ kg，压力为10 bar。根据兰格缪尔常数的计算值，确定可以从10 bar到1 bar的压力下解吸的甲烷量以及残留的甲烷含量。对于所有测试样品，在10 bar的压力下，残留的甲烷含量为吸附能力的30％至50％。使用热吸附方程式来计算极限等规吸附热值。在零表面容量时较高的吸附热值可能表明存在少量的微孔。对于具有最高吸附容量的样品，有限的等规吸附热低，表明褐煤中微孔的比例低。通过在77 K下的氮吸附测试证实了这一点。在研究的褐煤中，微孔的比例为2％至3％，而主要的孔隙率为中孔，其中Złoczew和Bełchatów矿床的褐煤占总孔的50％至66％。可以得出结论，由于在增高的造山压力下气体被压缩，斜方沸石中甲烷的大量吸附主要发生在中孔中。基于甲烷吸附能力和腐殖质胶凝软化石含量之间的简单统计相关性，在钙镁矿沉积物中较高的甲烷载量与腐殖质组分的胶凝度之间建立了联系。关于Złoczew矿床褐煤中甲烷吸附的结果，可以对波兰斜长石矿床的甲烷承载能力进行初步分类，