Tertiary air addition to solid waste-fired furnaces for NOx control

US8443739B2 · kind B2 · utility

Assignee

• COVANTA ENERGY, LLC · US

Inventors

• Stephen P. Goff · Orefield, US
• Mark L. White · Sonoma, US
• Stephen G. Deduck · Scotch Plains, US
• John Clark · Pflugerville, US
• Christopher A. Bradley · Elizabethtown, US
• Robert L. Barker · Hockessin, US
• Zenon Semanyshyn · East Hanover, US

Key dates

• Filing date: Jan 26, 2011
• Grant date: May 21, 2013
• Expiry date: Jan 26, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23J2219/20
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

Through the addition of tertiary air and a reduction of secondary air, NOx emissions from a waste-to-energy (WTE) boiler may be reduced. The tertiary air is added to the WTE at a distance from the secondary air, in a boiler region of relatively lower temperatures. A secondary NOx reduction system, such as a selective non-catalytic reduction (SNCR) system using ammonia or urea, may also be added to the boiler with tertiary air to achieve desirable high levels of NOx reductions. The SNCR additives are introduced to the WTE boiler proximate to the tertiary air.