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

Replacing a Stack Gas Flow Hardware Device with PEMS

Here is a presentation made to the Pacific Northwest International Section of the Air & Waste Management Association outlining the advantages of PEMS (predictive emissions monitoring systems) over stack flow devices.

The presentation was made by the president of CMC Solutions, a leading supplier of PEMS or predictive emission monitoring systems.

Replacing a Stack Gas Flow Hardware Device with PEMS from CTi Controltech

Other Advantages of PEMS:

• A PEMS can be configured, delivered and installed in 30-45 days. Installation of a PEMS requires the installation of a single computer with the DAS/PEMS software installed and interfaced to the boiler control system. Typically a one day installation and start up process. 
• PEMS have lower startup costs, normally one day including DAS. 
• PEMS require less on site training. PEMS training is usually 1 to 1 1⁄2 days plus DAS training. 
• PEMS should require no on site emergency service. A direct modem to the system takes care of 99% of all service requirements. 
• PEMS do not require dual range analyzers. 
• PEMS do not require EPA protocol calibration gases, piping, wiring, gas regulators or software to operate the auto-calibration sequence. 
• PEMS require no air source. 
• PEMS have no ongoing preventative maintenance requirements.