Community Research and Development Information Service - CORDIS


Computational fluid dynamics (CFD) models are increasingly applied as investigative and design methods in the power industry. However, it is recognised that the current generation of CFD codes are dependent on empirically-derived rate constants to describe many of the key processes and, as a result, they have only correlative rather than truly predictive capabilities. In particular, the treatment of gas-solid combustion reactions is considered to be unsatisfactory.
The principal objectives of the project were to develop improved physical and numerical models of the coal particle combustion processes that occur in pulverised coal flames and to test these models in CFD simulations of full-scale burners. The description of coal particle devolatilisation, particle swelling/fragmentation and char burnout processes was addressed through a combined programme of experimental and computational work.
Firing trials using two different coals were successfully completed in a fully instrumented combustion test facility, at a heat input of 35MW on a gross calorific value basis. The test coals were Kellingley, a high volatile bituminous coal from the north of England and Powder River Basin (PRB), a high volatile sub-bituminous coal from the western USA. In-flame gas analysis measurements were made and char samples were collected during both trials. In-flame temperature measurements were made during one trial. The char samples were characterised physically and chemically.

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