REMOVAL OF SULFUR DEPOSIT ADHERENT TO COKE OVEN GAS DESULFURIZER

摘要

PURPOSE:To remove sulfur deposit in coke oven gas desulfurization equipment readily and completely, by performing washing with an aqueous soln. of sodium hydroxide and/or potassium hydroxide in a concn. of 10% or higher. CONSTITUTION:In a redox reaction type wet desulfurization process to remove hydrogen sulfide in coke oven gas, deposits consisting of sulfur-contg. gummy substances tend to adhere to a filler layer, a heat exchanger, etc. of a desulfurization tower as alkali-contg. absorbent liquid is brought into contact with the coke oven gas. When the equipment is blocked with the deposit, operation is stopped and an aqueous soln. of NaOH and/or KOH in a concn. of 10%, pref. 20% or higher is poured into the equipment for washing to dissolve out the deposits. The method is esp. effective when the deposits have a high sulfur content and it is recommended that the equipment is washed with a tar acid- contg. soln. before the above treatment.