THE MODELING OF A FLOW IN FLAT AND RADIAL CONTACT UNITS WITH A STILL GRANULAR LAYER. THE SOLVING OF THE PROBLEM IN II DOMAIN (THE COLLECTING MANIFOLD). (PART- 2)
Ключевые слова:
chemical reactor, still granular layer, catalyst, Ergun law, stream function, granular layer resistance factor, Green's function, pressure field, velocity field, layer resistance.Аннотация
Heterogeneous catalytic processes conducted in axial or radial type reactors with a still catalytic layer
are some of the most important elements of the chemical technology. The attention of scientists and manufacturers to
the investigation and application of these contact units deals with the following advantages: a highly developed
surface of a phase separation, a possibility to provide a high flow velocity and hence to decrease sizes and a material
consumption, a construction simplicity and a reliability of an exploit. Improving an operation of contact units may be
achieved by refining present technologies, catalysts, disperse system structures and by creating new ones.
Nevertheless, in some cases large scale hydrodynamic heterogeneities in a working zone of the unit cancel out efforts
to increase an efficiency of chemical, heat/mass transfer and other processes. The exploration of reasons of the
hydrodynamic heterogeneities formation requires an investigation of liquid and gas motion physics features in
granular layers. A practice of a chemical reactors exploitation reveals that technical and economical indicators of an
industrial process are as a rule lower than the calculated ones, derived on a stage of the process design. Now it can be
considered proven that one of the reasons affecting the reactor output is the heterogeneity of a reagents flow in a
granular catalyst layer. The article deals with a mathematical modeling of an incompressible liquid flow in flat and
radial contact units with the still granular layer and a creation of numerical realization methods for the model
We propose a cycle of articles dealt with a model of a real reactor that consists of three parts: a distributing
manifold, a collecting manifold and a working zone, where the still layer of a granular catalyst is loaded. An input
and an output are made with a Z-shaped scheme. We consider processes and their equations in each reactor zone in
detail.
