| 摘要 |
PCT No. PCT/FI93/00461 Sec. 371 Date May 2, 1996 Sec. 102(e) Date May 2, 1996 PCT Filed Nov. 8, 1993 PCT Pub. No. WO95/13502 PCT Pub. Date May 18, 1995Method for combusting pulverized fuels in a tangentially fired boiler and reducing emission of nitrogen oxides comprises steps of feeding a substantially air-deficient mixture of fuel and primary air through a fuel feeding pipe (1) tangentially into a furnace of the boiler in order to form a reducing flame (II) aNd blowing of at least one stream of combustion air into the furnace. The invEntion is based in that the stream of primary air and fuel is caused to recirculate and turbulate at the open end (2) of the fuel feeding pipe (1) by passing it through a flame holder (9) extending into the fuel feeding pipe (1), and the stream of combustion air is directed away from the primary air/fuel stream in order to prevent the combustion air to mix into the reducing flame (II). |
