E. Gerald Meyer, University of Wyoming, Laramie, WY
Coal is by far the most abundant fossil fuel. It also has the lowest H:C ratio, about one. There are three categories for its use. Total combustion to produce CO2 and H2O, partial combustion (gasification) to produce CO and H2, and hydrodisproportionation (HDP) or refining to produce char (carbon) and a slate of value added products. Coal refining is anagous to oil refining in that by HDP some of the products have less hydrogen than the original coal (or oil) and some more. Oil refining produces naphtha, gasoline, kerosene, fuel oil, asphalt and coke. The H:C ratio of the last two is less than that of the oil and that of the other products is greater. Coal refining produces, naphtha, BTX, a fuel oil, syngas, sulfur, ammonia and sulfur/nitrogen-free char. The char has almost no hydrogen, while the other hydrocarbons have H:C ratios greater than that of the coal. The char as an EPA compliant fuel may be used either in pulverized coal boilers to produce power or process heat or for gasification in an IGCC power system. A new application of char as fuel for a molten tin fuel cell will be discussed.
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