Friday, September 26, 2014

Selective Catalytic Reduction Systems for Industrial and Commercial Boilers (SCR's)

Selective Catalytic Reduction Systems
Selective Catalytic
Reduction Systems
During the combustion process in large industrial or commercial boilers, the natural nitrogen in coal combines with oxygen forming nitrogen oxides (NOx). Nitrogen oxides in the atmosphere are unacceptable because they contribute to ground level ozone and undergo reactions in the atmosphere to form unwanted, and possibly harmful, fine particles.

Selective Catalytic Reduction (SCR) is a means of converting nitrogen oxides (NOx) to harmless nitrogen, water and trace CO2 by using an advanced emissions control system that injects a liquid-reductant agent, typically anhydrous ammonia, aqueous ammonia or urea, through a catalyst into the combustion exhaust stream.

The name "selective" derives because it selectively reduces levels of nitrogen oxides and "reduction" because of the chemical reaction where the ammonia or urea is the reducing agent converts NOx to nitrogen, water and CO2.

Commercial selective catalytic reduction systems are typically found on large utility boilers, industrial boilers, and municipal solid waste boilers. They have been shown to reduce NO by 70-95%.

SCR systems are one of the most cost-effective technologies available, while delivering great efficiency, being capable of reducing NOx emissions by up to 95 percent.

For more information on SCR's (Selective Catalytic Reduction Sytems) contact CTi Combustion.