Abstract To investigate the gas conversion mechanism in the zero-reforming process of coke oven gas and establish reasonable parameter control ranges, a multi-component multiphase coupled reaction equilibrium system involving CH 4 was developed, based on the actual composition of coke oven gas. Thermodynamic analysis of this gas-based shaft furnace multiphase coupling reaction equilibrium system was conducted using the Gibbs free energy minimization method and MATLAB software. Results indicate that during coke oven gas reforming, under conditions of 100–1,100 °C and 1–8 atm pressure, adjusting the addition of H 2 O, CO 2 , and O 2 increases the content of H 2 + CO (the effective components of reducing gas), enhances CH 4 conversion rate, and controls carbon deposition. The initial H 2 O amount primarily affects equilibrium H 2 concentration, while initial CO 2 and O 2 amounts primarily affect equilibrium CO concentration. As their addition increases, the concentrations of specific equilibrium components vary. When the reducing gas satisfies H 2 +CO ≥ 90 %, CH 4 conversion rate ≥ 90 %, and H 2 /CO ratio ≈ 8, the optimal additive ranges are: H 2 O at 4.76–18 %, CO 2 at 2.91–18 %, and O 2 at 1.71–3.61 %. Simultaneously, initial parameters can be adjusted to meet direct reduced iron production requirements and carbon deposition control. This study provides a theoretical reference for regulating coke oven gas self-reforming to produce hydrogen-rich reduction process gas.
Zheng et al. (Thu,) studied this question.