Intermediate geometry exit

Intermediate Geometry Exit Intermediate mixing, circulation rate, and suspension density characteristics. Ideal for combustion units requiring external heat transfer for control purposes e.g. the Lurgi units which may require high external solids fluxes, but also require good internal mixing for combustion efficiency reasons. 

In a simple membrane reactor, basically the membrane divides the reactor into two compartments the feed and the permeate sides. The geometries of the membrane and the reaction vessel can vary. The feed may be introduced at the entrance to the reactor or at intermediate locations and the exiting retentate stream, for process economics, may be recycled back to the reactor. Furthermore, the flow directions of the feed and the sweep (including permeate) streams can be co-current or counter-current or some combinations. It is obvious that there are numerous possible process and equipment configurations even for a geometrically simple membrane reactor. 

This section discusses approaches for evaluating F in three-dimensional pores. The first method was performed on computer it Is an extension of the lattice walk model [62]. As in the two-dimensional case, it is limited to pore geometries with intermediate constrictions (the ratio of pore exit width to pore body width > 0.10). An additional approach Is based on an analytical method for evaluating steady-state diffusion in spherical geometries [63]. There is no limit on the magnitude of the pore constriction in this model, but it Is a steady-state analysis. Together, the approaches quantitatively describe the shape factor for realistic geometries. 

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