For a furnace burning solid wastes, one of the key areas in design is the sizing of the furnace which is often determined on the basis of empirically selected furnace heat release rate and grate burning rate. An independent estimation of these factors would require the knowledge of physical processes of refuse combustion such as drying and heating of the refuse bed, chemical reactions of waste combustion, supply and distribution of combustion air, and mixing of combustion air with the burning refuse bed.
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