ENHANCED CONTROL OF MERCURY IN A WET SCRUBBER THROUGH REDUCED OXIDATION AIR FLOW

摘要

PURPOSE: A method is provide to control the ratio of oxidizing air in a flue gas desulfurizing system by reducing the oxidizing gas fed into an absorbing reaction tank and also reducing a mercury content in industrial gas exhausted out of a wet scrubber in the case of cleaning the industrial gas containing a mercury by a wet scrubber slurry. CONSTITUTION: Flue gas(12) is introduced from an air feed pipe(18) into a wet scrubber (14) and fly ash and particles are removed by a particle removing means(20) and then exhausted out of a wet scrubber outlet(24). Then oxidizing air(26) blown from a compressor and a blowing means(28) is fed into an absorbing reaction tank(16) oxidization of sulfide species is accelerated by the wet scrubber(34) to adjust the formation of a calcium slurry dihydrate, namely a gypsum to the maximum. At that time, the flow rate of the oxidizing air(26) supplied to the absorbing reaction tank(16) is reduced forcibly to the level not oxidizing sulfite and turning the same into the gypsum.