IMPROVED H2S SCRUBBING METHOD IN COKES OVEN GAS USING AMMONIA WATER AND MDEA

摘要

PURPOSE: Provided is a method for increasing absorption efficiency of hydrogen sulfide in coke oven gas by using MDEA absorbent solution along with ammonia liquid. CONSTITUTION: The method comprises the steps of supplying liquid absorbent, which contains ammonia of 10-15g/L and methyl diethanolamine (MDEA) of 2-5g/L and maintains liquid/vapor ratio of 3-4, to a hydrogen sulfide absorption tower(1); supplying liquid absorbent, which contains ammonia of 5-10g/L and MDEA of 5-10g/L and maintains liquid/vapor ratio of 1-2, to the hydrogen sulfide absorption tower(1); collecting and regenerating the used liquid absorbent from the hydrogen sulfide absorption tower using a regeneration tower(3); and supplying the regenerated liquid absorbent to the hydrogen sulfide absorption tower(1) and an ammonia absorption tower(2), respectively, with a flow rate ratio of 4:1-3:1.