Abstract
AbstractFor a multitube catalytic reactor in which catalyst occupies the shell side of the cooling tubes, a two‐dimensional model is developed to determine the nonuniform radial distribution of the temperature and concentration. The cross‐section of the fixed bed is divided into a number of equivalent portions proportional to the number of cooling tubes. Each portion is approximated by either an equivalent annular fixed bed or a transformed circular fixed bed in the complex plane. Enthalpy and mass balances are performed on the equivalent annular fixed bed while the radially varying flow distribution and the transport properties are considered in a transformed circular fixed bed. A correlation is developed for the equivalent annular model based on the relationship of the two different approximations. The model can also account for variations in radial porosity, radial velocity, and transport properties.
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