A Seattle company says it has demonstrated a major reduction of NOX emissions using a proprietary system called Electrodynamic Combustion Control.
A Seattle company says it has demonstrated a major reduction
Xemissions using a proprietary system called
Electrodynamic Combustion Control. From ClearSign Combustion Corp., the
technology introduces a computer-controlled electric field into the combustion
zone to control flame shape and heat. According to the company, the electric
field optimizes the chemical reactions that occur during combustion to minimize
With the technology, ClearSign reported NOXemissions of 15 ppm in a system with thermal output of more than 400,000 BTU/hr.
In many parts of the United States, NO
must be below 20 ppm. California's South Coast Air Quality Management District,
which includes the greater Los Angeles area, has introduced regulations that
would require boiler operators in 2013 to reduce NOXemissions to 9 ppm initially, and below 5 ppm subsequently, ClearSign says.
According to Joe Colannino, ClearSign's
chief technology officer, the California standards would be difficult to meet
with conventional burner technology alone. He notes says that the company’s
emissions-control demonstration validates burner design improvements, moving
its ECC technology further along the path to commercialization.
"Our ECC technology allowed us to
achieve [15 ppm] with a radically simplified burner design, requiring minimal
excess air and without the use of any fans or blowers for flue gas
recirculation," Colannino says.
According to Colannino, most low NOXburners use multiple gas jets to stage the introduction of fuel and air. In
many cases, large fans are added to recirculate flue gas to reach emissions
targets. ECC technology requires minimal excess air, optimizing fuel efficiency
while eliminating the need for fans, Colannino says.
Colannino notes that the ClearSign system
maintains flame stability across a wide operating range, which enables higher
turndown ratios compared to other technologies. The effect, he says, is
increased fuel efficiency in industrial settings in which boilers frequently
are cycled to reflect changes in demand.
"Boiler operators are always focused
on achieving NOXemissions standards at the lowest
possible cost," says Rick Rutkowski, ClearSign CEO. "Our goal is to
improve emissions performance to meet even the most stringent standards while
at the same time simplifying burner design and eliminating the need for
supplemental flue gas recirculation or costly SCR systems.
To download the white paper
“Electrodynamic Combustion Control Technology,” go to
http://tinyurl.com/97cenqe. For more information on ClearSign, go to www.clearsigncombustion.com.
Low NOX Technology Closer to Commercialization
September 5, 2012