Operating without excess ammonia can reduce NOX by up to 60%. A minimal ammonia slip (15 ppm) can increase efficiency up to 85% without the need for ammonia recovery. Because of its low investment cost and minimum space requirement, this solution is particularly attractive as a retrofit option.
Every combustion process generates nitrogen oxides (NOX) in the form of NO and NO2. When exposed to solar radiation, these oxides form ozone, an air pollutant. The SNCR DeNOX process converts nitrogen oxide into harmless nitrogen and water.
In the SNCR process (Selective Non-Catalytic Reduction), ammonia (NH3) is injected into a hot gas stream where it reacts with nitrogen oxides to form nitrogen (a natural constituent of air) and water vapor. The OptiVap system does not require steam injection, as some competitor systems do. Finely atomized Ammonia is injected directly into the combustion chamber along at a temperature between 1560°F (850°C) and 1830°F (1000°C).
Another advantage of this process is that dioxin formation in the flue gas is reduced significantly. This process has been used successfully for many years in numerous waste processing plants. The SNCR DeNOX process is capable of removing up to 90% of the nitrogen oxide from the flue gas, although typically efficiencies range from 50% to 85%, depending on the amount of CO generated by the process, the allowable Ammonia slip, and the stability of the temperature window.
In order to increase and stabilize system efficiency, the OptiVap system can be designed with a two-stage injection feature, whereby the gas temperature is controlled by the first stage and the ammonia is injected in a second stage, downstream of the first stage. This technique has proven effective in stabilizing the efficiency over changing process conditions.
• Cost-effective, space-saving
• Wide turndown range
• Adaptable to most processes
• Low initial cost compared to options
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