| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce an unburnt part, to reduce adhesion of clinker to air ports and to reduce the temperature rise of the air ports by changing the mixed state of air. <P>SOLUTION: A boiler is provided with burners 101 and the air ports 100. The air port 100 is a two-stage combustion type air port for supplying air for combustion insufficiency into an incomplete combustion region with a stoichiometric air ratio or less formed in a furnace 23 by the burners 101. The air port 100 is provided with a nozzle mechanism for blowing off air for combustion including axial velocity components of air flow and velocity components toward the center, and a mechanism for changing the ratio of the velocity components. The nozzle mechanism comprises a primary nozzle 1 for blowing off primary air which advances straight in the axial direction of the air port, a secondary nozzle 2 for blowing off secondary air accompanied by swirl flow, and a tertiary nozzle 3 for blowing off air of contracted flow as tertiary air from the outside of the primary nozzle. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
