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Staged combustion is a method for reducing Nitrogen oxides (NO_X) emissions from combustion. There are two methods:

• Air staged supply
• Fuel staged supply

[edit] Air staged supply

Characteristics:

• NO_X reduction rate from 50-75% is possible.
• Spatial separation of primary and secondary air.
• Control of combustion performance with primary air.
• Secondary air supply for burnout.
• Simple configuration.
• Application at small scale combustions.

[edit] Fuel staged supply

Characteristics:

• NO_X reduction rate from 50-75% is possible.
• Minor temperature instabilities at the reduction zone.
• Lower temperature necessary.
• Complex constructive configuration.
• Application at large scale combustions.