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Proceedings of the Second International Energy 2030 Conference,
November 4-5, 2008, Abu Dhabi, U.A.E.

Kinetic Study of High Temperature Steam Gasification of Biomass

Rafal Buczynski

University of Maryland, USA

Kriengsak Sangtong-Ngam

University of Maryland, USA

Islam Ahmed

University of Maryland, USA

Jakub Gmurczyk

University of Maryland, USA

Ashwani K. Gupta

University of Maryland, USA

Abstract
Gasification is also a flexible process of converting carbon and volatile matters in biomass into a fuel gas consisting of mainly gaseous products such as hydrogen, carbon monoxide, methane and carbon monoxide with the use of some gasifying agent. The exact composition of the gases produced depends on the gasifying agent and the operational conditions. In order to achieve the high hydrogen yield, it is necessary to understand the chemical kinetics of gasification. This reaction can occur under controlled conditions of both temperature and pressure at sufficient residence time. The main reactions that occur during the gasification process are partial combustion reactions and gasification reactions. The partial combustion reactions react with free oxygen and are essentially complete under gasification conditions. These reactions are exothermic reaction and their roles are to give energy for the gasification reactions, endothermic reactions. The biomass gasification consists of two important steps of (i) initial rapid pyrolysis (devolatilization) to produce char, tar and gases, and (ii) subsequent gasification of the char generated. The char consists of carbon, hydrogen, oxygen, ash and a small amount of hetero-atoms such as N and S. The char gasification step has much slower reaction rate when compared with the rapid pyrolysis step. It is, therefore, considered as the controlling parameter for the overall conversion process. Most of the char gasification data reported in the literature has been obtained from coal gasification process and this is very different form the pyrolysis conditions. In this paper data has been obtained on the chemical




 

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