| COVANTA ENERGY CORPORATION Patent applications |
| Patent application number | Title | Published |
|---|
| 20110308623 | AERODYNAMIC TUBE SHIELDS - Novel aerodynamic tube shields are presented herein. One embodiment may be comprised of a body, such as a semi-cylindrical body, for protecting against a tube's hostile environment and first and second fins, which may be tapered, for redirecting the flow of gas in the area around the tube. | 12-22-2011 |
| 20110117505 | TERTIARY AIR ADDITION TO SOLID WASTE-FIRED FURNACES FOR NOX CONTROL - 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. | 05-19-2011 |
| 20100189618 | DYNAMIC CONTROL OF SELECTIVE NON-CATALYTIC REDUCTION SYSTEM FOR SEMI-BATCH-FED STOKER-BASED MUNICIPAL SOLID WASTE COMBUSTION - 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. | 07-29-2010 |
