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What is NOx - And Why Control It?

We proudly promote the Nationwide Boiler CataStak™ Selective Catalytic Reduction (SCR) System for single-digit NOx emissions on package boilers and other fired equipment. Have you ever wondered exactly what NOx is, and, why reducing NOx emissions and your carbon footprint is important?  

NOx refers to nitrogen oxides. It is a generic term for a group of highly reactive gases containing oxygen and nitrogen in varying amounts. NOx forms when fuel is burned at high temperatures, like in a burner combustion process. Package boilers, fired heaters, gas turbines, heat recovery steam generators, and other fired equipment will produce varying levels of NOx, depending on the type of fuel, the burner construction and arrangement, and if any SCR technology is being used.

In short, reducing NOx emissions into the atmosphere will reduce a number of health and environmental hazards linked to the harmful pollutant. NOx has been linked to ground-level ozone, acid rain, water quality deterioration, global warming, and a number of significant respiratory issues.

The EPA and state air boards have been instrumental in the reduction of stack emissions since the 70’s, and Nationwide Boiler has been using and selling CataStak™ SCR systems to continue the trend. Check out this informative article for more detailed information on the harmful effects of NOx and how the EPA is working to control it.

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EPA Announces New Ozone Standard

Ground level ozone, which is created by combining the emissions of nitrogen oxides and volatile organic compounds in the presence of sunlight, can cause respiratory health issues and has been on the radar for decades. Since 1980, substantial progress has been made on ozone reduction and levels have fallen 33% while the economy continues to grow. Most recently, the Obama Administration and the Environmental Protection Agency (EPA) were evaluating the current ozone standard and proposed earlier this year a new decreased standard of 65 to 70 parts per billion (ppb). The current standard of 75 ppb was set in March of 2008, and some counties are still not in compliance.

The long awaited decision on the National Ambient Air Quality Standards was announced by the EPA yesterday, and the standard was reduced from 75 ppb to 70 ppb for ground-level ozone, produced by emissions released into the air from industrial plants, utilities, and vehicles. The EPA states that the public health benefits resulting from this new rule are an estimated annual savings of $2.9 to $5.9 billion in health care costs by 2025.

The EPA doesn’t expect states to comply to the new standard right away, and depending on the severity of the specific state’s ozone problem, the majority of states will have until between 2020 and 2025 to meet the standards. California, however, will have a longer period of time to comply, through 2037, due to its decades-long air pollution issues. Although fewer counties are in violation of the new standard than if they had lowered it to 65 ppb, 241 counties will be nonattainment for the 70 ppb standard, and it is estimated that 14 counties outside of California will not meet their deadlines.

States will be required to submit a state implementation plan (SIP) to the EPA for any designated nonattainment areas. The plans will outline how the State will attain and maintain the standard, and will contain control measures and strategies to reduce emissions. Plants that fall under the rule will likely be required to upgrade pollution equipment and monitoring systems to meet the new standard.

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Nationwide Boiler's Ammonia-Free CataStak Featured in Today's Boiler Magazine

Check out the Fall Edition of Today's Boiler Magazine, featuring Nationwide Boiler's Ammonia-Free CataStak. The article highlights the success of the system at a detention center in Castaic, CA, reducing NOx from 30 ppm to 3 ppm (@ 3% O2), with ammonia slip under 2 ppm.

Read the full article and contact us today to learn about the Ammonia-Free CataStak SCR system!

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Did You Know: Innovation with the CataStak SCR System

In 1999 we saw the first demonstration project of an SCR system for ultra low NOx performance and in 2001 Nationwide Boiler announced the CataStak SCR System, proven to reduce NOx emissions by as much as 90%.

The CataStak is a portable, low-temperature selective catalytic reduction (SCR) system consisting of a single-reactor housing with low temperature catalyst and an ammonia (aqueous or anhydrous) or urea (diesel exhaust fluid) injection option. This technology not only meets 5 ppm NOx, but outperforms burner technology and provides emissions reductions as low as 2 ½ ppm NOx. Advantages of the system include:

  • Easy field retrofit – no burner or fan changes required
  • Ammonia-free option – no special permits required
  • Low operating cost • Stand-alone operation – minimum operator intervention
  • Dramatic reduction in stack emissions – NOx, VOC & CO

In over 100 installations, the Nationwide Boiler CataStak SCR System has never failed a third-party compliance test and has provided peace of mind for plant owners knowing that their system will remain in compliance year-after-year, well past any current AQMD requirements.

Contact Nationwide Boiler 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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