Mercury control in seawater flue gas desulfurization systems

摘要

Disclosed is a method for controlling the emission, emission and / or re-emission levels of mercury in a process flue gas and seawater effluent stream through the control of the sulfite concentration in the seawater scrubber system. One way to control the level of mercury release, release and re-emission through the control of sulfite concentration is to measure the sulfite concentration in the seawater entering the seawater scrubber system and compare it to a predetermined sulfite concentration value. If the sulfurous acid concentration measured by the comparison is found to be higher than the predetermined sulfite concentration value, the amount of clean seawater and / or oxidizing air supplied to the seawater scrubber system is increased. If the comparison indicates that the measured sulfurous acid concentration is lower than the predetermined sulfite concentration value, the amount of clean seawater and / or oxidizing air supplied to the seawater scrubber system is reduced.