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A Kinetic Assessment of Entrained Flow Gasification Modeling

[+] Author and Article Information
Aalia Rakhshi

Department of Mechanical Engineering and Energy Processes, Southern Illinois University, Carbondale, IL 62901
aalia.rakhshi@siu.edu

Tomasz Wiltowski

Advanced Coal and Energy Research Center, Department of Mechanical Engineering and Energy Processes, Southern Illinois University, Carbondale, IL 62901
tomek@siu.edu

1Corresponding author.

ASME doi:10.1115/1.4040061 History: Received February 05, 2018; Revised April 09, 2018

Abstract

A kinetics assessment of the quasi-global homogeneous and heterogeneous reaction mechanisms is carried out for entrained flow coal gasification modeling. Accurate closure of the chemical source term in gasification modeling necessitates a detailed study of turbulence-chemistry interaction. Towards this end, time-scale analysis of the homogeneous reactions is discussed using eigenvalue analysis of the reaction rate Jacobian matrix. A singular value decomposition of the stoichiometric reaction matrix is performed to assess the behavior of the homogeneous reactions in a reduced species vector space. The significant factors affecting the heterogeneous char reactions is assessed and the relative importance of bulk diffusion and inherent char kinetics is analyzed in a gasifier. A thermodynamically consistent volatile breakdown kinetic mechanism is outlined incorporating the heat of its reaction obtained from the higher heating value (HHV) of coal. The overall study is carried out using numerical and experimental results of an actual pilot scale gasifier.

Copyright (c) 2018 by ASME
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