#TITLE_ALTERNATIVE#

• Main Author: (NIM 23099043), SUHERMAN
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/9378
• Institution: Institut Teknologi Bandung

A modeling study has been made to investigate flow maldistribution add hot spot that occur frequently in fixed bed reactors. The model that takes into account important phenomena including conservation of momentum, species, and energy as well as void fraction profile in radial position incorporates methanol oxidation to formaldehyde. A set of resulting mathematical equations called 2D-HOM-PVP (two-dimensional pseudohomogeneous model with porosity and velocity profiles) model were then solved using a semidiscretization method. <br /> <br /> <br /> <br /> <br /> The model has been successfully used to predict experimental data of Panthel Ii has also been shown that (i) flow maldistribution is attributed to random arrangement of catalyst particles resulting in variation of void fraction in radial position, (ii) hot spot or maximum temperature exists according to energy balance along the reactor, (iii) species are unequally distributed due to different reaction rate along the reactor as well as to radial position. <br /> <br /> <br /> <br /> <br /> Parametric study on reaction rate constant, thermal conductivity in radial direction, mass diffusivity in radial direction (Der), fluid viscosity, and wall heat transfer coefficient suggests that thermal transport significantly affect the distribution of flow, thermal and species while mass transport and momentum transport play less importantly. Increasing feed temperature, wall temperature, and feed mole fraction of methanol would lift up hot spot temperature. On the other hand, the increase in feed flow rate would reduce it. <br /> <br /> <br /> <br /> <br /> Shooting method has also been employed to solve the boundary value problems of the model. To obtain a given degree of conversion, some important parameters have been predicted successfully. <br />