Custom Designed Selective Catalytic Reduction (SCR) Systems

Selective Catalytic Reduction
(courtesy of Wikipedia)

Selective catalytic reduction (SCR) is a means of converting nitrogen oxides, also referred to as NOx with the aid of a catalyst into diatomic nitrogen, N2, and water, H2O. A gaseous reductant is added to a stream of flue or exhaust gas and is absorbed on to a catalyst.

Commercial selective catalytic reduction systems are typically found on large utility boilers, industrial boilers, and municipal solid waste boilers and have been shown to reduce NOx by 70-95%. More recent applications include diesel engines, such as those found on large ships, diesel locomotives, gas turbines, and even automobiles.


CTi Controltech manufactures custom SCR systems and would be glad to discuss your requirements.

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New 50,000 PPH Boiler, Central Valley

• New SCR, ammonia injection grid, and ammonia delivery skid
• Haldor Topsoe Catalyst
• New Ultra Low Nox Burner (RMB technology)
• New Biogas blending system
• New PLC based combustion control system
• New Fireye Burner Management (BMS)
• Designed to operate at less than 6 PPM NOx

Retrofit 300,000 PPH Boiler, Bay Area

• New SCR, ammonia injection grid, and ammonia delivery skid
• Haldor Topsoe Catalyst
• Custom configuration for low profile installation
• Allen Bradley PLC based BMS
• Designed to operated at less than 5 PPM NOx

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

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.