| 摘要 |
The invention concerns NOx-reduced firing of glass melting furnaces with preferably lateral fuel introduction at the combustion air ports thereof, wherein cross-flows of combustion air and combustible gas are suppressed by means of wall segments arranged in the combustion air port, air turbulence at the wall segment is reduced by waste gas filling of reduced-pressure regions and a primarily low-turbulence flame base is produced, which is based on the introduction of combustible gas in the form of a free jet. The wall segment and the waste gas filling jointly form a so-called flame base screen. As a secondary aspect the free jet is protected by the combustible gas jet being introduced into the core shadow of the flame base screen. The wall segment preferably simulates the idealised projection of a free gas jet, from the direction of view of the afflux flow of combustion air. Exhaust gas filling of the turbulence space is effected by the introduction of waste gas and/or fuel, preferably by means of a displacement lance, and upstream of the wall segment it forms a gas-dynamic waste gas spoiler which lifts the afflux flow of combustion air over the wall segment with a turbulence-reducing effect. Preferably the displacement lance has at least one axial gas discharge slot, it is disposed horizontally on the air afflux flow side at the foot of the wall segment and can be positioned axially and radially in relation to the wall segment. |
