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Modelling and simulation of autothermal reformer for synthesis gas production

Mirghani, Mousab Salah Eldeen (2007) Modelling and simulation of autothermal reformer for synthesis gas production. Masters thesis, Universiti Teknologi PETRONAS.

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Abstract

One dimensional heterogeneous adiabatic fixed-bed reactor with supported nickel catalyst is used to model the autothermal reformer for synthesis gas production. The flow rate of natural gas along the catalyst bed is considered to vary in the axial direction. The modeling and simulation of autothermal reformers is complex and requires detailed understanding of natural gas reactions kinetics. To investigate these kinetics, different kinetics models such as De Groote and Froment model are employed and predictions of the kinetics parameters such as activation energies, rate constants, and adsorption constants are made. An industrial plant for production of synthesis gas from natural gas, for methanol production is taken as acase study. Amaterial and energy balance is carried out for prediction of the input flow rates, feed composition to the autothermal reactor, and the partial pressures to the reactants. The pressure drop is calculated using Ergun equation. For the developed model, the rate of coke formation is neglected since suitable CH4/02 ratio of 1.7 in the feed and natural gas stream temperature ofhigher than 850OC are assumed. The effect of catalyst volume, gas superficial velocity, and combustion temperature on temperature profile of autothermal reformer, conversion and rate of reactions are studied. It is found that, the bed temperature can be reduced by 200 C, and each 1.5 m3 reduced of catalyst volume increased the bed temperature by 160 C. While increment of gas superficial velocity of 1m/s decreased the bed temperature by 150 C.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Chemical Engineering - Reactor Technology
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Ahmad Suhairi Mohamed Lazim
Date Deposited: 26 Jan 2015 16:04
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/14478

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