| 摘要 |
PROBLEM TO BE SOLVED: To provide an after-air port, capable of enhancing mixing effect of unburnt gas with fuel air at low flow velocity at an air port outlet part. SOLUTION: The after-air port comprises a cylindrical primary air nozzle 5 for carrying primary air 2, which is provided in the center of an opening part of a furnace wall 1a of a furnace 1 and carries combustion air of main stream, a secondary air nozzle 7 for carrying secondary air 6, which is provided around it, and an edge plate 16 for contracting a primary air passage, which is provided at the furnace 1-side opening end part of the primary air nozzle 5 in a direction orthogonal or substantially orthogonal to a gas flow. COPYRIGHT: (C)2007,JPO&INPIT
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