关键词: 煤, 能源, 煤基燃料, 洁净煤技术

Abstract: With rapidly growing demand for energy,especially for transportation fuels,China is likely to turn to coal as a basis for providing synthetic liquid fuels for transportation and other applications.Three alternative approaches to providing liquid fuels from coal:direct coal liquefaction,indirect coal liquefaction and synthesis of coal-based oxygenated fuels,are described and compared in this paper.In the first two cases a major challenge is to increase the ratio of hydrogen to carbon and the objective product is synthetic crude oil or hydrocarbon fuel.Modern technology of direct coal liquefaction has not yet been commercialized,while Fisher-Tropsch synthesis is well established commercially.Even though coal-based hydrocarbon fuels do not have significant economic advantages as compared with petroleum products,they have significant strategic importance in energy security in China.Two oxygenated fuels from coal, methanol(MeOH) and dimethyl ether (DME), can also be derived via indirect liquefaction.The oxygenated fuels from coal has a unique advantage in both technology and economy, which is derived from economical utilization of C,H,and O in coal.

Key words: 煤, 能源, 煤基燃料, 洁净煤技术