Abstract
A model has been developed of a waste heat recovery boiler utilising typical plant off-gas consisting of both gaseous and particulate combustibles. The model allows the calculation of temperatures of gas and particles within the boiler and hence the likelihood of deposition onto the boiler walls. The model was applied to a typical waste heat boiler geometry, and a typical off-gas composition including a mixture of combustibles (char) and non-combustible particulates. Mixing in the burner region, char burnout and char particle temperature were analysed using the model. Combustion stability was also studied using a simple Eddy break-up model which accounts for combustion kinetics and the results compared with a Mixed-is-burnt model.
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