| 摘要 |
<p>PURPOSE:To effect stable desulfurization of high-temp. gas whatever change the amt. of a gasification-produced gas to be purified undergoes, by performing dry desulfurization of a high temp. reducing gas produced by coal gasification treatment and performing wet desulfurization of a regenerated gas produced by regeneration treatment of a dry desulfurizing agent. CONSTITUTION:Sulfur compds. contained in a high-temp. reducing gas 4 produced by coal gasification treatment (gasifier oven 2) are removed as follows. That is, the sulfur compds. contained in the high-temp. gas 4 are reacted with a desulfurizing agent to effect dry desulfurization (dry desulfurization column 7). Then, sulfur dioxide contained in the regenerated gas produced in the regeneration treatment (regenerating column 8) of the used desulfurizing agent is reacted with a desulfurizing agent 13 [e.g., aq. solns. contg. Ca(OH)2, CaCO3, etc.] and an oxidizing agent (e.g., O2 gas) to effect wet desulfurization (wet desulfurization column 11). Waste gas 12 produced by wet desulfurization of the regenerated gas is pref. returned to the gasifier oven 2, wherein the remaining SO2 is converted into H2S.</p> |
