火成岩侵入条件下煤低温氧化特性实验研究  

Research on Low Temperature Oxidation Characteristics of Coal Under the Condition of Igneous Intrusion

作　　者：梁洪军 毕强[2] 曲宝[2] 史全林[1] 高远 秦波涛[1] LIANG Hongjun;BI Qiang;Qu Bao;SHI Quanlinl;GAO Yuan;QIN Botao(School of Safety Engineering,China University of Mining ＆ Technology,Xuzhou 221116,China;Tiefa Cod Group Co.,Ltd.,Diaobingshan 112700,China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]铁法煤业集团公司,辽宁调兵山112700

出　　处：《煤矿安全》2018年第8期43-47,共5页Safety in Coal Mines

基　　金：国家自然科学基金重点资助项目(U1361213);国家自然科学基金资助项目(51476184)

摘　　要：为了研究火成岩侵入条件下煤的低温氧化特性,以大兴矿南五709、南二905 2个工作面的正常煤与受火成岩侵入影响的变质煤为研究对象,采用程序升温实验测煤的耗氧特性、产气特性(CO、C_2H_4)及交叉点温度Tcpt,同时采用低温氮气吸附法、压汞法研究火成岩对煤孔隙结构的影响。结果表明:受火成岩侵入影响,煤中部分介孔、宏观孔的比表面积、孔容增加,煤的平均孔径增大,煤中具备更多可与氧气结合的反应点位;变质煤较正常煤的耗氧量及耗氧速率更大,Tcpt更低,煤自燃倾向性指数也大幅降低,S5709煤样由正常煤的605.69降至310.62,S2905煤样由正常煤的761.34降至382.91;且整个低温氧化过程表现出变质煤释放CO、C_2H_4含量更大的特点。火成岩侵入的高温高压作用使煤中孔结构(孔径>20 nm)发育,增加了煤的自燃危险性。In order to study the low-temperature oxidation characteristics of coal under the condition of igneous intrusion, two pairs of samples collected from S5709 and S2905 coalface in Daxing Mine, with one normal and one metamorphic coal affected by the igneous intrusion in each pair were investigated. The oxygen consumption, gas emission（CO, C_2H_4）and crossing point temperature Tcptof the samples were tested by the temperature programmed experimental apparatus, and the low temperature nitrogen adsorption, mercury intrusion were used to analyze the pore structure under the influence of igneous intrusion. The results show that the surface area and pore volume of macroscopic pores and part of the mesopore increase for coal intruded by igneous rocks, and its average pore size is larger. And the O_2 consumption of metamorphic coal is higher, while Tcptis lower compared to the normal coal. The tendency index of coal spontaneous combustion falls from 605.69 of normal coal to 310.62 in S5709, and from 761.34 to382.91 in S2905, respectively. Moreover, the gas emission of metamorphic coal is higher than that of the normal coal. The effect of high temperature and pressure induced by igneous rocks causes the development of coal pore with pore size more than 20 nm,thus, the risk of coal spontaneous combustion increases.

关 键 词：火成岩侵入 孔隙结构 低温氧化 自燃倾向性 程序升温 

分 类 号：TD752.2[矿业工程—矿井通风与安全]