Stephen G Deduck

US Patent:

8443739, May 21, 2013

Filed:

Jan 26, 2011

Appl. No.:

13/014265

Inventors:

Stephen P. Goff - Allentown PA, US
Mark L. White - Tannersville PA, US
Stephen G. Deduck - Scotch Plains NJ, US
John D. Clark - Goshen NY, US
Christopher A. Bradley - Elizabethtown PA, US
Robert L. Barker - Hochessin DE, US
Zenon Semanyshyn - East Hanover NJ, US

Assignee:

Covanta Energy Corporation - Fairfield NJ

International Classification:

F23N 3/06
F23G 7/00
F23J 15/00

US Classification:

110191, 110188, 110203, 110235, 110245

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.

US Patent:

20080148713, Jun 26, 2008

Filed:

Dec 19, 2007

Appl. No.:

11/960148

Inventors:

Mark L. White - Tannersville PA, US
Stephen G. Deduck - Scotch Plains NJ, US

Assignee:

COVANTA ENERGY CORPORATION - Fairfield NJ

International Classification:

F01N 9/00

US Classification:

60287

Abstract:

The present invention controls reagent flow levels in a selective non-catalytic reduction (SNCR) system by more accurately predicting Nitrogen Oxides (NOx) production with a municipal waste combustor. In one embodiment, the reagent levels correspond with measured furnace temperatures. The reagent levels may have a baseline level from prior measured NOx that is then modified according to temperatures measurements. A slow controller may use NOx measurements over an extended period to define a base regent level, and a fast controller may use additional information such as the furnace temperature to modify the base regent level. The fast controller may further receive two additional signals that are added individually or together to maximize NOx control while minimizing ammonia slip from the reagent. The two signals are a feed-forward signal from the combustion controller and a feedback signal from an ammonia analyzer downstream of the combustion zone.

US Patent:

20080149010, Jun 26, 2008

Filed:

Oct 4, 2007

Appl. No.:

11/905809

Inventors:

Stephen P. Goff - Allentown PA, US
Mark L. White - Tannersville PA, US
Stephen G. Deduck - Scotch Plains NJ, US
John D. Clark - Goshen NY, US
Christopher A. Bradley - Elizabethtown PA, US
Robert L. Barker - Hochessin DE, US
Zenon Semanyshyn - East Hanover NJ, US

International Classification:

F23J 15/02
F23G 5/00

US Classification:

110235, 110344

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.

US Patent:

20100189618, Jul 29, 2010

Filed:

Mar 31, 2010

Appl. No.:

12/751506

Inventors:

Mark L. White - Tannersville PA, US
Stephen G. Deduck - Scotch Plains NJ, US

Assignee:

COVANTA ENERGY CORPORATION - Fairfield NJ

International Classification:

B01D 53/56
G05D 7/00

US Classification:

423235, 422110

Abstract:

The present invention controls reagent flow levels in a selective non-catalytic reduction (SNCR) system by more accurately predicting Nitrogen Oxides (NOx) production with a municipal waste combustor. In one embodiment, the reagent levels correspond with measured furnace temperatures. The reagent levels may have a baseline level from prior measured NOx that is then modified according to temperatures measurements. A slow controller may use NOx measurements over an extended period to define a base regent level, and a fast controller may use additional information such as the furnace temperature to modify the base regent level. The fast controller may further receive two additional signals that are added individually or together to maximize NOx control while minimizing ammonia slip from the reagent. The two signals are a feed-forward signal from the combustion controller and a feedback signal from an ammonia analyzer downstream of the combustion zone.