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The CataStak™ SCR: What, Why, and How

As stack emission regulations become more and more demanding, plant facilities will often seek the lowest possible emissions to meet or exceed the newest standards. There are two options currently available to lower NOx emissions: front-end burner technology and back-end selective catalytic reduction (SCR) technology. 

Nationwide Boiler’s CataStak™ SCR system was originally tested and utilized in our boiler rental fleet, and is now offered for both rent and for sale to lower NOx on many different types of fired equipment. 

What is a CataStak™ SCR?

Nationwide Boiler developed the CataStak™, a low-temperature SCR system capable of reducing post combustion NOx emissions by as much as 95%. The CataStak SCR system consists of a single-reactor housing with low temperature catalyst and an ammonia (aqueous or anhydrous) or urea (diesel exhaust fluid) injection skid. 

How Does it Work?

The CataStak SCR system is typically located between the flue gas exhaust and the economizer. As the flue gases exit the boiler, they are routed through the ammonia injection grid to the SCR housing with DeNOx catalyst. As the gases exit the housing, the NOx is released as nitrogen and water. 

One unique feature of our CataStak SCR system is that the catalyst that we supply facilitates the reaction of NOx and ammonia, allowing the reaction to occur at a lower temperature.

Why Choose a CataStak™ SCR System?

Three key advantages of the CataStak SCR system include easy field retrofit, low operating cost, and minimum operator intervention. When installing the SCR system, there is no need to change out burner controls or the fan, providing a simple installation and a major cost savings. Additional cost savings and increased efficiency are seen due to better turndown, lower O2, and reduced motor horsepower without FGR. Lastly, the CataStak can operate independently causing less boiler trips and less interference with plant operations.

With our CataStak SCR system, Nationwide Boiler can guarantee results as low as 2½ ppm NOx @ 3% O2, which is well below all current state implementation plan levels. Being able to achieve 2½ ppm NOx will give your plant peace of mind for any future changes to emissions regulations. The CataStak delivers exceptional performance, reliability, and compliance assurance. 

With over eighteen years of experience, a 100% success rate and over 120 installations, we have more experience and satisfied customers than any other competitor for boiler SCR systems. In addition to selling the system, Nationwide Boiler is an active user of the CataStak on our rental fleet for ultra low NOx boiler requirements.

The CataStak SCR system is available as an add-on for existing and new package boilers, gas-fired turbines, refinery heaters, and for other demanding combustion applications. Contact us today to learn how you can decrease your facility’s operating costs and lower your carbon footprint with a CataStak SCR system.

 

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