Simplified kinetic models describing the fate of coal nitrogen under fuel-rich combustion conditions
Publisher
The University of Arizona.Rights
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.Abstract
Twenty three sets of experimental data describing CO, CO₂, H₂, O₂, NO, NH₃, and HCN concentration profiles for fuel-rich pulverized coal combustion in plug flow configurations were correlated by a simple kinetic mechanism. A comprehensive mechanism covering the entire fuel-rich zone was formulated by combining models describing short and long time scale combustion. Short time scale phenomena (up to 0.6 seconds) including coal devolatilization were handled by developing global semi-empirical models based on fundamental concepts. Kinetic parameters for the proposed mechanism were estimated by using a non-linear regression technique. This model then allowed the prediction of major and nitrogenous species evolved in the early stages of combustion and yielded reasonable predictions of all these species concentrations. For the long time scale phenomena (up to 3 seconds) an existing model was used. Under most experimental conditions the extended model yielded good predictions of nitrogenous species from known process variables.Type
textThesis-Reproduction (electronic)
Degree Name
M.S.Degree Level
mastersDegree Program
Graduate CollegeChemical Engineering