ClearSign Combustion reports a dramatic reduction of nitrogen oxides (NOx) when using Proprietary Electrodynamic Combustion Control™ (ECC™) technology.

ECC is a brand new technique for the control of NOx emissions could mean major cost savings and increased efficiency for tens of thousands of commercial and industrial boilers.

The company reports NOx emissions of 15 parts per million (ppm), in a system with thermal output of more than 400,000 Btus per hour. 15 ppm is superior to the NOx reduction performance of most commercially available Low NOx burners (LNBs), and is equivalent or superior to the performance of many Ultra-Low NOx burners (ULNBs) in the market today.

NOx is a criteria pollutant that contributes to ground-level ozone and is regulated by the EPA. In many parts of the United States, NOx emissions levels are required to be below 20 ppm.

However, California’s South Coast Air Quality Management District, which includes the greater Los Angeles area, has introduced new regulations that come into effect in January of next year requiring boiler operators to further reduce NOx emissions to 9nine ppm, and subsequently to under five ppm.

According to ClearSign’s Chief Technology Officer, Joe Colannino, these standards will be difficult to meet using conventional burner technology alone. Colannino says that this demonstration is a major validation of the burner design improvements enabled by ClearSign’s ECC technology, and a key milestone in the path to commercialisation.

“This is a very exciting early development,” said Colannino. “15 parts per million is a very competitive number for even Ultra-Low NOx burners. These results exceeded our expectations for this stage of development, and help build confidence that we may soon be able to report further performance improvements to surpass this milestone as we progress toward commercialisation.”

“Not only were we able to dramatically reduce NOx levels,” Colannino added, “but our ECC technology allowed us to achieve this with a radically simplified burner design requiring minimal excess air and without the use of any fans or blowers for flue gas recirculation (FGR).”

Colannino also pointed out that because ECC technology can maintain flame stability across a wide operating range, it can enable much higher turndown ratios than competing technologies. This has the effect of significantly increasing fuel efficiency in industrial and commercial settings where boilers are frequently cycled to reflect changes in demand.