Covanta Energy Corporation

Convanta Energy Corporation

Robert L Barker

Hanwei Zhang

Ron Broglio

Stephen Goff

Mark L White

Stephen G Deduck

Christopher A Bradley

Stephen Paul Goff

Zenon Semanyshyn

John D Clark

Stephen P Goff

Systems and methods for automatic control of a baghouse fabric filter system as a single unit to maintain a consistent pressure drop are disclosed. The fabric filter system may be a pulse jet cleaning system, and a controller may be provided to receive inputs from pressure sensors and other components and to control activation of pulse pipes for cleaning filter bags. The controller may adjust parameters including the dwell time between pulses, the duration of each pulse, and the pulse air pressure. The controller may further optimize these parameters to provide the minimum cleaning necessary per pulse to achieve the consistent differential pressure. By continuously adjusting the parameters, the system maintains the maximum amount of filter cake on the bags to promote optimal emissions control performance.

System and method for automatic control of differential pressure in a baghouse system

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

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 drier, 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.

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

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Hockessin, DE, United States of America

Robert L Barker