Project Info

Project Title 
Demonstration of Energy Efficient Ultra Low Nox Burner Control Technology
Project Number 
Project Year(s) 
2005 - N/A

The electrical energy consumption and the cost of owning and operating boilers have increased drastically in the recent past due to more stringent environmental regulations. Typically, today's 9 ppm ultra low NOx burners require over twice the fan power that was required of previous generation 30-ppm low NOx burners.
The generally accepted method for reducing NOx emissions is to add excess ambient air (EAA) air or flue gas recirculation (FGR) to the burner. This additional mass has the effect of quenching or cooling the flame, which reduces the peak flame temperature and reduces NOx formation.
The use of flue gas is preferred over the use of excess air for thermal efficiency reasons, even though more fan power is required to move flue gas through a burner. Nominally, 20% excess air or 35% flue gas recirculation is required to achieve 9 ppm emissions.
This project will demonstrate a new method of burner operation that will reduce ULNB power consumption by 25%. This concept utilizes smaller fan sized to EAA operation. It operates in FGR mode up to 82% full load and gradually moves over to EAA mode to reach full load.