Multiple Gas–Solid Reactions in a Porous Sorbent Applied to Warm Gas Desulfurization

Abstract

In this work, a mathematical model of multiple gas–solid reactions in a porous sorbent has been applied to simulate warm gas desulfurization. The model has been formulated by incorporating the intrinsic kinetics of the individual reactions obtained from separate experiments. The model output has been compared to the experimental results of zinc oxide sulfidization and reduction by hydrogen and carbon monoxide. The microstructure of subgrains was simplified to reduce computational costs. The model predictions were in good agreement with experimental measurements of the overall rate of reaction and the degree of sulfur fixation over a wide range of experimental conditions. The mathematical model successfully predicted the performance of a porous sorbent in a thermogravimetric analysis reactor. We demonstrated numerically that hydrogen is more harmful to zinc oxide-based sorbents than carbon monoxide, implying that a shift reactor would be best located downstream, rather than upstream from a warm gas-cleaning process.

Towards more efficient control of the ironmaking blast furnace: modelling gaseous reduction of iron ores in H2-N2 atmosphere

“…There are various gas-solid systems in metals and materials processing industries, and gaseous reduction of iron ores has been paid extensive attention over the years, leading to numerous publications reporting experimental results and mathematical models [2][3][4][5][6][7]. In the field of ironmaking, the most frequently adopted mathematical models are the unreacted shrinking core model (USCM) and its refined variant, e.g., the grain model [8].…”