Wall Fired

The NO70R low NOx burner is designed for wall-fired coal, and coal and oil combination applications.  Like T-Fired applications, the NO70R is designed to stage air in both the vertical and horizontal plan. NOx control is achieved with the coal nozzle and spreader located in the center of the burner. The coal nozzle is designed to concentrate the fuel and air in the center of the coal nozzle creating a very fuel-rich mixture. As this mixture passes over the coal spreader, the blades divide the coal stream into distinct streams. These streams enter the furnace in a gradual helical pattern, resulting in gradual mixing of the coal and secondary air. Secondary air is introduced to the furnace through the air register, supported by the burner front plate, and then through the burner barrel and over the secondary air diverter. Devolatilization of the coal in the fuel-rich mixture occurs at the burner exit in an oxygen-lean primary combustion zone, resulting in lower fuel NOx conversion. Peak flame temperature is also reduced, thus suppressing thermal NOx formation.



Features and Benefits of NO70R Burners :

• Lower NOx Levels upto 50% NOx reduction with only burner replacement alone and upto 70% nox reduction with a SOFA system. 

• No Adverse Increase in UBC - at a minimum, unit efficiency is maintained

• Control of Burner Air Flow - independent control of air and swirl in dual air passages as well as air flow splits which controls near field burner stoichiometry.
Typical NOx levels achieved for NO70R burners range from 0.38 lb/mmbtu for firing E. bituminous coal unstaged to 0.15 lb/mmbtu for firing sub-bituminous coal staged.