Control to mercury by strengthening wet gas scrubbing appts process through reducing flow of oxidized air

Application Number: 00105345
Application Date: 2000.03.31
Publication Number: 1283516
Publication Date: 2001.02.14
Priority Information: 1999/3/31 US 09/282,483; 1999/8/18 US 09/375,765
International: B01D53/64;B01D53/77
Applicant(s) Name: Babcock & Wilcox Co.
Inventor(s) Name: K.E. Reidinje;M.J. Holms;D.A. Marden
Patent Agency Code: 31100
Patent Agent: zhou chengze
Abstract A method and apparatus reduces mercury in industrial gas by reducing oxidation in the absorber reaction tank of a wet scrubber so that sulfites in the wet scrubber are increased to enhance mercury removal from the industrial gas. By controlling a rate of oxidation air flow supplied to a wet scrubber slurry within the absorber reaction tank at a reduced rate relative to that rate of oxidation air flow required to achieve nominally 100 % oxidation of the wet scrubber slurry, the wet scrubber slurry used to scrub the industrial gas contains a selected non-zero sulfite concentration sufficient to achieve greater mercury removal from the industrial gas. The selected sulfite concentration in the wet scrubber slurry is preferably greater than about 0.3 millimoles/liter.