Article Number 200007, August 2000

TECHNOLOGIES FOR NO_X REDUCTION IN PC FIRED UTILITY BOILERS - A MANUFACTURER'S PERSPECTIVE
Keiji Makino

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ABSTRACT:

One important aspect of boiler design to which manufacturers given much attention is control of nitrogen oxides emissions by use of low NO_X burners and furnace design strategies. Volatile matter content of coal is very important in influencing NO_X production. Without air staging, NO_X tends to increase with volatile content but with staging NO_X emission decreases with increasing volatile content.

The paper outlines the development of these technologies together with the research that has underpinned their development.

For a low NO_X burner rapid coal heating is shown to be important. In tests with a semi-anthracite coal (VM 10%) the new CF-a WR burner reduced unburnt loss by 40 to 50%, compared with IHI's conventional low NO_X DF burner, but with only a small increase in the level of NO_X . Meanwhile, developments of micronising and the wide range burner design promise equally good results with low volatile coals.

Key Words: NO_X, Furnace, Combustion, Burner.

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