Removal of Hydrogen Sulfide in Simulated Coke Oven Gas with Low-Grade Iron Ore

The hydrogen sulfide (H₂S) removal performance of limonite in the presence of coke oven gas (COG) components (H₂, CH₄, CO, CO₂, and H₂O) has been studied in a cylindrical flow-type quartz-made fixed-bed reactor at 300–800 °C under a high space velocity of 51,000 h^–1 to develop a novel hot gas cleanup method. The H₂S removal behavior by reduced limonite in He does not change at the temperatures examined. On the other hand, the breakthrough curves in 50%H₂/He depend on the temperature, and high performance is found at lower temperatures. An investigation of the breakthrough curves of H₂S in the presence of COG components at 300–600 °C reveals that the addition of 30%CH₄ to 50%H₂/He does not influence the performance below 500 °C, whereas the coexistence of 5%CO with 50%H₂/30%CH₄/He drastically decreases the H₂S removal ability of reduced limonite. In addition, the breakthrough curves in 5%CO₂ coexisting with 50%H₂/30%CH₄/5%CO/He are similar to those of 50%H₂/30%CH₄/5%CO/He. However, the addition of 5%H₂O to 50%H₂/30%CH₄/5%CO/He dramatically improves the H₂S removal performance of reduced limonite. Similar tendencies are observed in simulated COG (50%H₂/30%CH₄/5%CO₂/5%H₂O/He). Furthermore, the H₂S breakthrough curve strongly depends on the space velocity.