Objective The aims are to summarize the operation of new flue gas alkali desulfurization unit in 140 kt/a sulfur recovery unit,analyze the abnormal conditions during the operation of flue gas alkali desulfurization unit,and put forward corresponding countermeasures.Methods(1)The operation of the alkali desulfurization unit was summarized,and the operation parameters and flue gas emission were analyzed.(2)The flushing water was changed from industrial water to desalted water,and the pH value of lye was controlled stably,which solved the problem of rising pressure drop of flue gas alkali tower.(3)The connecting pipeline between the alkali desulfurization tower and the circulating tank was reformed to solve the problem of liquid level fluctuation in the alkali desulfurization tower.(4)By ensuring the supply of oxidized air,adjusting the pH value of alkali solution,and preventing the ammonia escape from the quench tower,the problem of excessive salinity wastewater was solved.Results The typical problems were solved in the operation of the flue gas alkaline desulfurization unit.This unit was put into run in July 2017 and operated stably until the overhaul in March 2022,with a continuous operation time of more than 1 700 days.Conclusions The long-term stable operation of the unit is realized,and the sulfur dioxide emission in the flue gas is up to the standard,which is far lower than the requirement of the emission standard.It can provide reference for similar devices.
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