Drying and devolatilization of Mississippi lignite in a fluidized bed
Fluidized bed combustion offers a means of burning coal and other low grade fuels with high moisture and ash content in an economical and environmentally acceptable way. Fluidized bed combustors can be made to reduce SO/sub 2/ and NO /sub x/ emission by suitable control of the combustion process eliminating the need for flue gas treatment. Low rank coals such as Mississippi lignite contain appreciable amounts of moisture in their ''as-mined'' state. Hence, lignite particles being introduced into the combustor will undergo several processes before they are completely burned. These processes include, drying (with or without shrinkage), devolatilization, and combustion of volatiles and residual char. All these processes are expected to occur in overlapping time periods and their interactions are not well understood. In this paper, a model is presented which describes the coupled drying and devolatilization of low rank coals in fluidized beds. Experiments are also performed in a three inch ID fluidized bed unit using alumina as bed particles to obtain data for drying and devolatilization of Mississippi lignite. The model predictions are then compared with the experimental data obtained.
- Research Organization:
- Chemical Engineering Department, University of Mississippi, University, MS
- OSTI ID:
- 5913005
- Journal Information:
- Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Vol. 29:2; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
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