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The US Environmental Protection Agency (EPA) has steadily tightened regulations for allowable amounts of pollutants that can be discharged into the atmosphere. For fossil fueled power plants, regulations are now in place for the amounts of sulfur, carbon monoxide, volatile organic compounds, particulate matter, and NOx that can be released.
Equipment and operating modifications can go a long ways toward reducing NOx emissions. Technologies such as low NOx burners, staged combustion, gas recirculation and low excess air firing can all assist with NOx removal. However, to meet upcoming EPA mandates, more aggressive reduction techniques such as Selective Catalytic Reduction (SCR) must be used.
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