| abstract |
A method and system for capturing H 2 S from hot gas streams such as from a coal or other fuel gasifier are disclosed. Zinc or zinc oxide precursors in gas, liquid, or fine powder form are injected into the hot duct work of coal gasifier exit after fly ash has been removed to react with H 2 S gas. In addition to ZnO sulfidation, a portion of the Zn-based reagents converted to the vapor state in the reducing fuel gas environment, reacts with H 2 S and forms fine ZnS particles that are then collected on a high efficiency, high temperature filter. Periodically, the filter is backflushed, and spent sorbent is collected in a hopper, removed for regeneration, and returned to the injection system. |