云南小发路C5煤层无烟煤特性与煤相分析

Characteristics and coal facies of high quality anthracite from coal seam No.5 of Xiaofalu coal mine,Yunnan province

综合运用煤岩学、煤化学等理论与方法,系统研究了云南省彝良县小发路优质无烟煤C 5煤层的煤岩、煤质特性,结合煤相参数分析其地质成因。结果表明:小发路优质无烟煤C 5煤层灰分产率极低(最低1.49%,小于5.00%的占76.5%);相对其他典型无烟煤(太西煤、晋城无烟煤等),C 5煤层煤氢含量高(多为3.22%~3.37%)、自由氢极高(2.95%~3.12%)且氧含量极低(1.44%~2.27%);C 5煤层煤以光亮型煤为主(79.8%),镜质组中结构镜质亚组与碎屑镜质亚组相近,惰质组中以结构亚组为主。C 5煤层剖面性质变化不大,煤相参数TPI大多大于1.00,GI为4.22~5.78,煤相为低位森林沼泽相。

The characteristics and geological origin of high quality anthracite from coal seam No.5 of Xiaofalu,Yunnan province,China were studied based on the theories and methods of coal petrology,coal chemistry etc.The results showed that coal seam No.5 was characterized by extremely low ash yield of raw coal(A d:the lowest value 1.49%).Compared with other typical anthracites in China,coal seam No.5 had higher hydrogen content(H daf:the highest were 3.22%~3.37%)and the highest free hydrogen content(2.95%~3.12%),as well as the lowest oxygen content(1.44%~2.27%).Bright coals were the main lithotype(79.8%).Subgroups with cell structure were the main maceral composition in both vitrinite and inertinite.The TPI and GI values of coal seam No.5 were 0.97~1.44 and 4.22~5.78(>4.00),respectively.