Reactors with a Distribution of Solid Particle Size

Note that this formulation would apply to both concurrent and counter-current systems thus it should form the logical starting point of the description of kilns, moving beds, etc. 

Good illustrative examples of such formulations may be found in the literature [83-85]. 

7 Reactors with a Distribution of Solid Particle Size 

In our previous discussions of the behavior of reactors we, assumed that the solid charged to the reactor consisted of pellets or particles all of which were the same size and shape. In some industrial reactors the solid feed consists of particles of widely varying sizes. This is particularly true if the feed material is produced by comminution of larger pieces of solid. From the considerations outlined in earlier chapters it follows that the larger particles in the feed will usually take longer to react than the smaller particles, and this effect must be taken into account when calculating the overall conversion of the solids leaving the reactor. 

For a reactor in which the gas conversion is small, the reaction of an individual particle is not affected by the presence of the other particles and a fairly straightforward mathematical development [86] can be employed. 

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REACTORS WITH A DISTRIBUTION OF SOLID PARTICLE SIZE... 

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