An Experimental Investigation on Hydrogasification of Coal Chars in a Fixed Bed Reactor under High Pressure

Abstract:

The Characteristic of Coal Hydrogasification Was Carried Out in a Fixed Bed Reactor by Using Chars of Datong Bituminous, Spain Lignite and Pingdingshan Bituminous. it Was Investigated that the Effects of Reaction Temperature (973-1123K), Reaction Pressure (3-7Mpa), the Char Preparation Temperature (973-1073K) and Catalyst (CaO) on CH₄ Yield. the Three Stages Model Was Provided to Explain the Coal Hydrogasification Process. the CH₄ Yield Increases Rapidly in the First Stage which Is Dominated by the Reaction of Active Groups (-O-CH₃,-COOH,-CH₂OH,-CH₃) and H₂. the CH₄ Yield Keeps Constant in the Second Stage. the Releasing Rate of C-O-(C) and C-O-(H) Active Groups Dominates the CH₄ Yield Rate. the CH4 Yield Decreases in the Third Stage which Is Dominated by the Reaction Rate of Carbon and Hydrogen. there Is Higher CH₄ Yield under Higher Pressure which Is Related to the Higher Reaction Rate of Graphite and H₂ under Higher Pressure. the Structure of Raw Coals and Chars Was Identified by FTIR. in Additional, the Influences of Char Structure and Catalyst on the CH₄ Yield Are Discussed in the Paper.

• Periodical: Advanced Materials Research (Volumes 524-527)
• Pages: 863-870
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.524-527.863
• Online since: May 2012
• Authors: Yuan Zhou, Ying Zheng, Wen Xi Wang, Chu Guang Zheng
• Keywords: CaO, CH₄ Yield, Coal Char, Functional Group, Hydrogasification

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