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Study on the effect of lowering steam to carbon ratio in combined reforming of natural gas to the synthesis gas.

Swee Leong, Lau (2003) Study on the effect of lowering steam to carbon ratio in combined reforming of natural gas to the synthesis gas. Universiti Teknologi Petronas. (Unpublished)

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Abstract

The objective of this research is to study the effect of lowering Steam to Carbon ratio in a combine reformer to produce syngas in order to optimize the performance of the combine reformer. A combine reformer in this project refers to the combination of steam methane reformer (SMR) and autothermal partial oxidation reformer (POX). Currently the steam to carbon molar ratio is maintaining at 3:1 ratio in order to prevent carbon deposition on the nickel catalyst active surface. To achieve this, a simulation model of the reformer unit using HYSYS simulation software version 3.01 was develops. The preliminary stage of this research will focus on literature review of natural gas reforming technology. Then second stage will focus on research for reaction kinetics on the SMR and POX reaction. A simulation model will then be developed to further analyze the reforming process by manipulating the operating condition and S/C ratio. Finally the last stage of the research will focus on optimizing the operation of both reformers. Based on the simulation result and analysis on various S/C ratio, this project suggest that operating the steam methane reformer using S/C molar ratio of 2:1 instead of 3:1 is favorable to methanol synthesis since carbon monoxide and carbon dioxide molar is increased at S/C ratio of 2:1 and the amount of hydrogen produced is still in excess to cope for the methanol synthesis requirement. However, since there is no physical experiment to determine the actual carbon boundary, there is no strong basis to prove that operating at S/C ratio at 2:1 will curb the carbon deposition problem. A conservative suggestion will be to lower down the S/C ratio to 2.5:1, saving 14 tons per hour of steam and its associated boiler feed water BFW treatment cost while increasing methanol production. A detail experiment to determine the actual carbon boundary is recommended since literature has been reported that optimum S/C ratio between 1.9 and 4.5 for SMR.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Ionic Liquid
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:47
URI: http://utpedia.utp.edu.my/id/eprint/7718

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