PURPOSE: To provide a low-NOx combustion method of pulverized coal, which is capable of unifying the concentration of pulverized coal in the outlet port of a burner nozzle to improve the stability of ignition and brightness of flame.
CONSTITUTION: In a low-NOx combustion method of pulverized coal, wherein pulverized coal, crushed in a coal crush mill, is transferred into a coal sending pipe 1 together with primary air to inject it into a furnace 86 and burn it in the furnace 86 through a pulverized coal nozzle 4, consisting of a bent passage (curved part of the inlet port of a burner) 2 and a tubular nozzle unit (duct having a bulkhead) 12, continued to the bent passage 2, the mixed flow 14 of pulverized coal and primary air is branched into two divided flow passages through bulkheads 11, 13, dividing the internal passage of the bent passage 2 and the tubular nozzle unit 12, continued to the bent passage 2, into two divisions in horizontal direction. At the same time, the mixed flow is whirled and thereafter, both of the branched flows are joined and injected from the outlet port end of the pulverized coal nozzle into the furnace 86 to burn it.
NOMURA SHINICHIRO
OKIURA KUNIO
OYATSU NORIYUKI
KIYAMA KENJI
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