Thermodynamic Equilibrium Calculations for the Reforming of Coke Oven Gas with Gasification Gas

Thermodynamic analyses of the reforming of coke oven gas with gasification gas for syngas were investigated as a function of coke oven gas‐to‐gasification gas ratio (1–3), oxygen‐to‐methane ratio (0–1.56), pressure (25–35 bar) and temperature (700–1100 °C). Thermodynamic equilibrium results indicate that the operating temperature should be approximately 1100 °C and the oxygen‐to‐methane ratio should be approximately 0.39, where about 80 % CH 4 and CO 2 can be converted at 30 bar. Increasing the operating pressure shifts the equilibrium toward the reactants (CH 4 and CO 2 ); increasing the pressure from 25 to 35 bar decreases the conversion of CO 2 from 73.7 % to 67.8 %. The conversion ratio of CO 2 is less than that in the absence of O 2 . For a constant feed gas composition (7 % O 2 , 31 % gasification gas, and 62 % coke oven gas), a H 2 /CO ratio of about 2 occurs at temperatures of 950 °C and above. Pressure effects on the H 2 /CO ratio are negligible for temperatures greater than 750 °C. The steam produced has an effect on the hydrogen selectivity, but its mole fraction decreases with temperature; trace amounts of other secondary products are observed.