NOx Control for Boiler

Effective Emission Control

For many coal-fired utility and industrial boiler applications, combustion modification is often the lowest cost method of reducing NOx emissions. GE offers a wide range of combustion modification products and can help you determine the most effective technology or combination of technologies to deliver cost-effective NOx reduction. Our portfolio of technologies for boilers includes low NOx burners for wall- and cell-fired boilers, Overfire Air and Reburn Systems.

Nitrogen Oxide Control Technologies

Low NOx Burners

GE's low NOx burner for wall- and cell-fired, coal-fired boilers and furnaces is custom-engineered to match your furnace conditions, fuel and NOx control requirements. It offers proven performance, typically reducing NOx emissions by 50 percent or more while maintaining unsurpassed mechanical reliability. Retrofitting your boilers or modifying your burners with GE's low NOx burner can reduce NOx emissions for as low as $1 to $6 USD per kilowatt. The simple, rugged design features axially moving components-no gears or complicated linkage-and is manufactured with a high-strength, heat-resistant alloy to ensure a long service life.

Overfire Air (OFA)

Overfire air is a combustion modification technology that stages the combustion process to reduce nitrogen oxide emissions. The typical NOx reduction for application of overfire air to utility boilers is between 20 and 40 percent, depending on the application, design and unit operation. Overfire air systems can be installed independently, but are typically used in conjunction with low NOx burners or reburn systems.

Combustion air is diverted from the main burner zone and injected through ports located above the main burners. GE's unique dual concentric zone port design provides variable swirl and flow control to adjust the flow characteristics to optimize the mixing conditions for all operating conditions. GE has extensive experience installing overfire air systems on a range of boiler designs including tangential, cell, wall or cyclone firing configurations with varying main and reburn fuels, including coal, oil and gas.

Reburn Systems

Reburn is a commercially-proven combustion modification process that can achieve "deep" NOx control at low cost per ton of NOx removed.

Reburn utilizes sequential fuel and air staging to reduce NOx emissions by as much as 60 percent. Reburn systems can be installed on many different boiler configurations, including wall fired, tangential, cell and cyclone. The NOx reduction that can be achieved depends on the conditions in the main combustion and reburn zones. Temperatures, residence times and furnace flow patterns are important in determining the effectiveness of the process. GE has experience with a wide range of reburn fuels including gas, oil, orimulsion, coal and biomass. GE's reburn systems can be a cost-effective alternative to SCR for NOx SIP Call compliance.

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