Use of SNCR as BACT for NOx Control in Boilers and Municipal Solid WasteIncinerators

摘要

The report presents an investigation into the present operational use ofselective non-catalytic reduction (SNCR) as a method of NOx control in boilers and incinerators. Two patented forms of SNCR were researched; Exxon's Thermal DeNOx, which uses ammonia injection, and Fuel Tech's NOxOUT, which uses urea injection. A questionnaire was faxed to fifteen facilities in the United States that use ammonia injection systems, most of which are located in the Stockton, Delano and San Diego areas of EPA Region IX. No facilities were found in the United States that currently operate with NOxOUT or any other type of urea injection system. From the responses that were received, it can be concluded that SNCR is an effective and relatively inexpensive method of NOx control, achieving up to an 85 percent reduction efficiency with a capital cost ranging from $100,000 to $500,000 and a monthly cost of about $4,000 for ammonia and maintenance.