METHOD FOR SUPPRESSING FORMATION IN SULFUR IN TAKAHAX DESULFURIZATION

摘要

PURPOSE:To enable long-time operation by suppressing the formation of S as a by-product, by keeping and controlling the optimum concn. of a catalyst on the basis of the concn. of HCN in gas and a catalyst concn. estimation formula derived from a reaction mechanism. CONSTITUTION:The concn. of the catalyst in a system is estimated from the values of a catalyst feed amount, a H2S absorbing amount, a catalyst deterioration amount, a liquid holding amount, a liquid drain amount and the number of elapsed days and the amount of the catalyst corresponding to the amount of HCN in coke oven gas is secured so as not to precipitate elemental S. At the same time, the amount of air contributing to oxidation reaction is sufficiently replenished so as to convert ammonium hydrosulfide generated by the absorption of H2S to thiosulfate and ammonium sulfate.