Chapter 12
Chemical reactors
Thermochemical reactions which occur in industrial processing
operations, such as in blast furnaces, fluidised bed roasters and
other such systems, form the subject of study. Of particular interest
is the interplay between reaction and temperature in exothermic
reactions. The bulk of the chapter is concerned with temperature and
(gas) concentrations of single pellets in gas-solid reactions, and
various asymptotic limits are studied. A paradigm is the slow reaction
limit of the exothermic reaction, which leads to the thermal runaway
equation. The steady solution branch is studied for high activation
energy, including (unusually, I think) a description of the hot
branch.
Most of this applies to the porous pellet, but a description of the
non-porous pellet is also given. Only in the last section is there a
discussion of how to incorporate the local description in a
macroscopic model.