Title: Hydrogen Production and Integrated Gasification Combined Cycle (IGCC)
Abstract: The conversion of syngas to hydrogen for ammonia synthesis is one of the oldest applications of the water gas shift reaction, and remains as one of the applications with the most stringent product specifications. The water gas shift reaction occurs in two reactors, a high temperature (HT) shift reactor, which accomplishes the bulk of the reaction, and a low temperature (LT) shift reactor that pushes the water gas shift reaction further to the right. The traditional HT shift catalyst can tolerate low levels of sulfur; but the LT shift catalyst is poisoned by sulfur, so sulfur is removed from the syngas prior to the shift reactors using an acid gas removal (AGR) process. The steam–iron process is an alternative to the water gas shift reaction for producing H2 from syngas. It is also known as the syngas chemical looping (SCL) process. The process concept revolves around the reversible oxidation of a metal. Several metals have been considered, but iron is preferred. Syngas is desulfurized, and then hot (750 to 900°C) syngas, at about 3 MPa, contacts a countercurrent stream of solid Fe2O3 in the reducer. This reactor converts the gas stream to CO2 and H2O, and the solid stream to a mixture of Fe and FeO.
Publication Year: 2010
Publication Date: 2010-11-19
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 11
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