1. School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo　 454000,China; 2. College of Resources and Environment,Henan Poly-technic University,Jiaozuo　 454000,China; 3. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,Jiaozuo 454000,China

为研究煤中微量元素及其赋存状态对煤层生物甲烷产出过程的影响,以变质程度相近的A煤和B煤为研究对象,在环境条件和菌种源相同的情况下进行生物产气实验,对反应前后的煤中微量元素及其赋存形态进行分析,以探究发酵底物本源微量元素的影响机理。结果表明:(1)A煤产气量为248 m L,比B矿产气量多出了26.5%。A煤中有益微量元素Fe,Co,Ni,Zn,Mo,Mn等含量比B矿的多。(2)在生物产气后,煤中微量元素都有不同程度地减少,A矿的Fe,Mn,Cr的量,B矿的Fe,Mn,Mo减少明显,两矿的Ni,Co,Zn也有不同程度的减少,说明煤中的微量元素都参与了反应。(3)产气较多的A原煤中腐植酸结合态含量较多,而腐殖酸结合态是能够被产甲烷菌利用的形态。(4)反应前后A煤中微元赋存状态表明,腐植酸结合态和可交换态微元有所增加,大分子有机结合态含量减少,说明微元赋存状态明显改变。煤中微量元素的含量和赋存状态在生物产气后的变化能为生物产气机理提供更好的参考。

In order to study influence on the production of biogenic methane from trace elements and their occurrence forms in coals,samples were taken from two coals A and B of similar degree of coalification,and the experiment of bio- logical gas production was carried out under the same condition of environmental and bacteria source to expore the effect mechanism of trace elements in the origin of fermentation substrate. The results showed that:① A coal gas pro- duction is 248 mL,26. 5% mineral gas volume more than B. The beneficial trace elements contents in A,such as Co, Ni,Zn,Mo,Mn,Fe,are much more than that of B. ② After biological gas production,trace elements in coal are re- duced to varying degrees;the amount of Fe,Mn,Cr in A and Fe,Mn,Mo in B decreased significantly,while the amount of Ni,Co,Zn in the two coals were reduced in different degrees. It shows that the trace elements in coal are involved in the reaction. ③ There are more humic acid combining state in raw coal with more gas production,and humic acid binding state is a form of methane producing bacteria. ④ Coal element occurrence before and after reaction indicated that humic acid bound and exchangeable element increased,molecules bound to organic matter content decreased,in- dicating that occurrence of the element changed. The content and occurrence state of trace elements in coal can provide a better reference for the mechanism of biological gas production.

国家自然科学基金资助项目(41472127；41472129；41502158)；

Xia Daping,Lan Jianyi,Chen Xi,et al. Study on the excitation and blocking system of trace elements in coals on the production of biogenic methane[J]. Journal of China Coal Society,2017,42(5):1230-1235.