Modeling Analysis of Shell, Texaco Gasification Technology's Effects on Water Gas Shift for Fischer-Tropsch Process

摘要

This work analyzes different gasification processes affect on WGS process with Excel-Aspen Plus based models.in large scale production. Results show that Shell gasifier can obtain higher (CO + H_2)/syngas ratio and higher thermal efficiency but lower H_2/CO ratio than Texaco gasifier. However, both of H_2/CO ratios are below 1.0 and WGS reaction has to carry out to prepare for the Fischer-Tropsch synthesis. The simulation shows Shell syngas does not offer adequate H_2O molecules for WGS shift reaction and it can be supplied by the 5.2MPa steam generated from the boiler of the Shell gasification process. Texaco syngas has sufficient H_2O molecules to meet the need of this reaction. The overall thermal efficiency of the Texaco-WGS is lower than that of the Shell-WGS.