CHEN 3102 Lecture Notes - Lecture 48: Fireproofing, Pyrolysis, Natural Disaster
9 May 2015
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Rxns of solids are important to a vast array of energy and material applications: Rxns w/ for can be categorized: continuous conversion: solid rxns occur throughout the solid continuously. Fixed bed can put stuff in, close, do rxn, and then empty @ end. Chen3102_reactionsandreactors page 1 fluidized bed good for: coating of particles, combustion of solids, pyrolysis of waste products. Common w/ food coal used to be done this way too, but if malfunctions, have to shut the whole thing down and someone has to go inside hot reactor. Chen3102_reactionsandreactors page 3 we etch away surface like what we did yesterday in recitation. Within this, there are 2 extremes: fast diffusion of a(g) through solid b(s) and slow rxn. -> a goes everywhere in particle b and rxn happens simultaneously we start off with particle b: other extreme: shrinking core model fast rxn, slow diffusion. B(s) outside has reacted but inside has not.
