PURPOSE: To reduce NOx, by transporting pulverized coal to a combustion nozzle from a crusher and by reducing the concn. of oxygen in the waste combustion gas to be jetted out of a combustion nozzle to below the concn. of oxygen in the air.
CONSTITUTION: Combustion air 11 is supplied to a pulverized coal combustion burner 17 as secondary and tertiary air. Fuel coal is transported to the pulverized coal combustion burner 17 through the inside of a pulverized coal supply duct 24 using combustion primary air afger the coal have been pulverized by stock coal crusher 21. A part of combustion gas 10 extracted by a primary air blower 22 is used as the primary air for the combustion of the pulverized coal. Thus, the concn. of oxygen in the primary air can be reduced to below the oxygen concn. of the atmospheric air, because the waste combustion gas is used as the primary air, and reduction of quantity of NOx to be generated at the combustion of the pulverized coal can be attained.
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ARASHI NORIO
HISHINUMA TAKAO
BABCOCK HITACHI KK