HYGAS process

The dry coal particles flow into a lift pipe which serves as the first stage of hydrogasification. In the pipe, the coal is contacted with hot gas (methane, carbon oxides, hydrogen, and steam) from the lower sections of the reactor and the coal reacts with the hydrogen, forming additional methane (ca. 33% of the methane in the final product is produced in this section). 

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Processes for hydrogen gasification, hydrogen pyrolysis, or coking of coal usually produce Hquid co-products. The Hygas process produces about 6% Hquids as benzene, toluene, and xylene. Substitution of petroleum residuum for the coal-derived process oil has been used in studies of coal Hquefaction and offers promise as a lower cost technology (104). 

Figure 1. Schematic flow sheet of IGT HYGAS process...

Figure 2. IGT HYGAS process —steam-oxygen gasification...

Pilot plant and demonstration plant scale projects include the SYNTHANE process, the Hygas process, and the Bigas process among others. See W. P. Haynes and A. J. Forney, High BTU Gas from Coal Status and Prospects, Tech. Rep. PERC/IC-76-1. U.S.E.R. D.A. Office of Public Affairs, 1976. 

Fan, L. T., Shieh, J. H., Shimizu, Y. and Chiu, S. Y., "Thermodynamically-Oriented Analysis and Synthesis of a Process System - HYGAS Process," AIChE Annual Meeting,... 

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