coaleumn.煤烃coaln.煤；木炭vt.烧成炭；供应煤vi.加煤；装煤coal and gas geology煤瓦斯地质coal gas preparation制气coalbed methane well煤层气井coal spontaneous fire煤炭自燃coal - fired boiler燃煤锅炉coal mine underground煤矿井下coal injection system喷煤系统coal-based methanol煤基甲醇coal mine environment煤矿环境coal-bearing system含煤岩系