Steam Boiler Series

WNS Series Ultra-Low NOx Condensing Integrated FGR Steam Boiler

WNS Series Ultra-Low NOx Condensing Integrated FGR Steam Boiler

Foster Wheeler Boiler Develops and Launches Integrated Condensing FGR Flue Gas Recirculation Series Boilers According to the Latest Emission Standards for Atmospheric Pollutants from Boilers in Beijing

Products Description

FGR Flue Gas Recirculation Combustion: By mixing a portion of the flue gas with air and sending it to the combustion chamber for combustion assistance, the mixed combustion air can effectively reduce the temperature and oxygen concentration within the combustion chamber. Since the activation energy required for the combustion reaction between fuel and oxygen is far less than that between oxygen and nitrogen, the fuel first reacts with oxygen. Only when there is excess oxygen does the fuel react with nitrogen to form NOx. However, the lower temperature in the reaction zone significantly slows down the reaction with nitrogen, thus effectively suppressing the formation of thermal NOx.


Through repeated testing and experimentation, Foster Wheeler's Research and Development Center has designed a reasonable furnace structure and size, matched with fully International Brand low-NOx burners, utilizing external FGR flue gas recirculation combustion technology. Combined with our independently developed PLC control system, this ensures that the boiler operates in a more environmentally friendly, energy-efficient, safe, and reliable manner. Test data shows that after adopting flue gas recirculation, the NOx emission concentration of the boiler can be reduced to below 30 mg/Nm³ (O₂ = 3.5%).

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