Covanta Energy Corporation

Stephen Goff

Robert L Barker

Hanwei Zhang

Ron Broglio

Stephen G Deduck

Mark L White

Zenon Semanyshyn

John D Clark

Christopher A Bradley

A two stage refuse gasification combustion system for processing refuse is disclosed. The system may contain features such as an advancer, a first and second gasifier, a gas regulator, and a post combustor. Additionally, methods for regulating gas and advancing refuse through a two stage refuse gasification combustion system are disclosed.

Gasification combustion system

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.

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

Growing community of inventors

Allentown, PA, United States of America

Stephen Goff