NOx Control Systems

B&W has extensive experience and offers a variety of options for nitrogen oxides (NOx) control.

Selective catalytic reduction (SCR) for high performance NOx control

SCR System for NOx Reduction

Selective catalytic reduction (SCR) systems are the technology of choice as the most effective method of post-combustion NOx reduction. As a leader in providing complete project packages including system design and construction, ammonia storage and delivery systems, reactor and catalyst design, control systems, and balance of plant equipment, our extensive experience includes both new and retrofit applications.

B&W’s selective catalytic reduction (SCR) technology, combined with B&W MEGTEC’s VOC catalytic oxidation expertise provides our customers with a proven and competitive suite of NOx control solutions.

High performance SCR systems require thorough blending of ammonia with the NOx-laden gas. Our ammonia injection grid and mixing systems deliver the high performance required over the entire load range, simply and robustly, with minimal maintenance requirements.

Our reference plant installations include applications that utilize fossil and biomass fuels, as well as municipal waste. Our vast experience allows us to anticipate and control the potential effects of increased SO2 production, increased pressure drop, or ammonia slip.

Through our array of SCR reactor and flue design options, we can match our overall system design to the available space on site.

Selective non-catalytic reduction (SNCR) for cost effective NOx control

SNCR Systems

In certain applications, B&W MEGTEC’s selective non-catalytic reduction (SNCR) technology can be deployed as a relatively low capital cost solution. Our SNCR technology utilizes custom-designed Turbotak atomizing nozzles to inject ammonia or urea solutions directly into the hot gas to chemically reduce NOx to nitrogen and water. In applications where site specific performance data is necessary, we can conduct a full-scale demonstration of the effectiveness of an SNCR solution.

We offer pilot testing at your facility to determine the feasibility of SNCR for NOx emissions control. Urea and ammonia injection testing is conducted to evaluate the best choice of reagent for your process, proper equipment sizing for full-scale installation, and injection locations.

We continue to expand our database in chemical production applications such as glass and carbon black manufacturing through full-scale demonstrations. Our goals are to maximize NOx control performance while optimizing chemical utilization with low reagent consumption and the lowest levels of reagent slip. We utilize both predictive and scale modeling techniques to assure optimum gas flow distribution to achieve this goal.

Low NOx Burners & Overfire Air Ports

Overfire Air Systems

Additional NOx reduction can be achieved by integrating low NOx burners and staged combustion (overfire air) into the overall system. Since 1971, B&W has sold low NOx combustion systems for more than 120,000 MW of generating capacity (more than 8,000 burners) in both new and retrofit boiler applications. Our low NOx burner technology has been successfully applied to a broad range of B&W and non-B&W units with varying fuel characteristics and boiler arrangements.

We pioneered the development and application of NOx ports and air staging as a NOx emissions control technique. Combined with our other low NOx technologies, such as burners and selective catalytic reduction systems, overfire air systems can be installed on all wall-fired and corner-fired steam generators and are part of an overall NOx reduction strategy.

New Build

Babcock & Wilcox (B&W) projects, new build
We consistently demonstrate the ability to successfully execute innovative solutions for our customers, from new equipment to large, complex full-scope engineering and construction projects.

Upgrades / Retrofits

Upgrades and Retrofits by B&W
Modifying, improving and maintaining existing equipment are vital considerations for the long-term viability and profitability of all operations.

Parts / Services

Babcock & Wilcox Parts and Service Support
An extensive network of worldwide regional service centers, field service engineers and technical support personnel are available to provide the customized service and aftermarket solutions for your requirements.