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Recent regulations have required reductions in emissions of nitrogen oxides (NO x ) from electric utility boilers. To comply with these regulatory requirements, it is increasingly important to implement state-of-the-art NO x control technologies on coal-fired utility boilers. This paper reviews NO x control options for these boilers. It discusses the established commercial primary and secondary control technologies and examines what is being done to use them more effectively. Furthermore, the paper discusses recent developments in NO x controls. The popular pri-

Evaluation of Nitric Oxide Abatement w i t h Ferrous Chelates, Environ. Proaress. Vol. 8. No. 2. M a y 1989. 34P. Harriot, Proceedures, research note prepared for the Pittsburgh Energy Techno1 ogy Center, April 1988. 35Perrvts Chemical Enaineerina Handbook, 6th ed., p. 14-35 to 14-37. 36M. Teramoto et. a1. * p. 452, 455.

EXECUTIVE SUMMARY AbstractWet scrubbing is the leading proven commercial post-combustion FGD technology available to meet the sulfix dioxide reductions required by the Clean Air Act Amendments. To reduce costs associated with wet FGD, Dravo Lime Company has developed the ThioClear process. ThioClear is an ex-situ forced oxidation magnesiumenhanced lime FGD process. The ThioClear process differs fiom the conventional magnesium-enhanced lime process in that the recycle liquor has minimal suspended solids and the by-products are wallboard quality gypsum and magnesium hydroxide, an excellent reagent for water treatment. The process has demonstrated sulfur dioxide removal efficiencies of +95% in both a vertical spray scrubber tower and a horizontal absorber' operating at gas velocities of 16 fps, respectively. This report details the optimization studies and associated economics fiom testing conducted at Dravo Lime Company's pilot plant located at the Miami Fort Station of the Cincinnati Gas and Electric Company.

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