Determining start parameters for oxygen–water steam gasification with and without recirculation

Abstract

The analytical, unified selection method of the converting medium composition is presented as to apply for the oxygen – water steam gasification the recirculation of reaction products. The selected molar fractions of the converting medium components should give the assumed (needed) CO/H2–ratio of the synthetic gas by the chosen process pressure and temperature. The graphical selection methods applying the MOLLIER–HOFFMANN diagram are used for the parameters preselecting of the air – water steam gasification, e.g. if there is any contents of nitrogen from the atmosphere. The presented analytical method refers to the oxygen – water steam without and with gas recirculation. The last assumption allows the presence of CO, H2, CO2 and CH4 in the converting medium — new gasifying technologies need the permanent presence of carbon monoxide and hydrogen because of the iron catalyst. The determined values of its molar fractions help to choose the suitable process calculation iterative method.