Direct Combustion of Solid Carbonaceous Fuels: The Diffusionally Controlled Regime

摘要

This is a review of the current understanding of diffusionally controlled combustion. Emphasis is placed on identifying those parameters which determine the relative importance of external diffusion and how this relates to the particle burning rate. Conceptual models which have been proposed for these relationships are discussed. Among the parameters considered are temperature, pressure, intrinsic reactivity, particle size, gas properties, and flow conditions. Most solids combustion data in the literature are for graphite, coal char, and petroleum coke. A brief review is given of experimental data which demonstrate the relative importance of external diffusion for these fuels. Primary emphasis is given to fluidized bed combustion, since it will probably be the method of choice for burning many low-grade fuels. Finally, specific experimental and theoretical needs for future work are identified. (ERA citation 09:006388)