Info

Combustion Air

Combustion Air

Boiler

Heat Exchanger

Fig. 17-11 Line Diagram of Reduced Air Preheat (RAP) Process.

Overfire Air

Burnout Zone

• Normal Excess Air

Reburning Zone

• Slightly Fuel Rich

Primary

Combustion Zone

• Reduced Firing Rate

Combustion Air

Overfire Air

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Guide to Alternative Fuels

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