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A simple theoretical analysis of the burn-out times_v4.pdf (311.05 kB)

A Simple Theoretical Analysis of the Burn-out Times of an Isothermal Particle of Coal Char Under Air-Firing, Gasification and Oxyfuel Combustion in Fluidised Beds

preprint
revised on 24.04.2021, 01:49 and posted on 26.04.2021, 08:00 by Toyin Omojola

Coal combustion in air, gasification with carbon dioxide, and oxyfuel combustion in oxygen/carbon dioxide mixtures was studied at high process temperatures in a bubbling fluidised bed reactor where burning is controlled by external mass transfer conditions. Theoretical analysis of the burn-out times of an isothermal particle of coal char in air is provided for the case where a fraction of carbon monoxide is oxidized close to the char particle. Burn-out time equations are provided for the gasification of char in carbon dioxide. Both burn-out time equations are compared to analytical equations derived for the oxy-fuel combustion of char particles in oxygen/carbon dioxide mixtures. The results are particularly relevant for retrofitting existing bubbling fluidised bed reactors for clean energy generation to meet global warming targets.

Funding

Cambridge Commonwealth Trust (10140618)

History

Email Address of Submitting Author

toyin.omojola@bath.edu

Institution

University of Cambridge

Country

United Kingdom

ORCID For Submitting Author

0000-0001-9376-6977

Declaration of Conflict of Interest

no conflict of interest

Exports

ChemRxiv

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