Existing nitrogen oxide (NOx) control systems cannot be used exclusively for all purposes. Commonly used dry systems such as selective catalytic reduction (SCR), selective noncatalytic reduction (SNCR), and combustion modi-ƒcations require speciƒed conditions. In particular, the right temperature is required for SNCR (900-1,000°C) and SCR (270-400°C). Wet systems have the drawbacks of expensive chemical addition, high water usage, and excessive hazardous sludge production (Rhoads et al., 1990).