초록 ▼

A process and apparatus for combustion of a fuel and oxidant in which a first portion of a fuel is mixed with an oxidant to form a fuel-lean fuel/oxidant mixture in a fuel-lean combustion zone. The remaining portion of fuel is mixed with the fuel-lean fuel/oxidant mixture downstream of the fuel-lean

A process and apparatus for combustion of a fuel and oxidant in which a first portion of a fuel is mixed with an oxidant to form a fuel-lean fuel/oxidant mixture in a fuel-lean combustion zone. The remaining portion of fuel is mixed with the fuel-lean fuel/oxidant mixture downstream of the fuel-lean combustion zone, forming a substantially stoichiometric fuel/oxidant mixture. The stoichiometric fuel/oxidant mixture is ignited, forming a primary flame having high luminosity and low NO.sub.x emissions.

대표청구항 ▼

[ We claim:] [1.] An industrial material heating furnace comprising:combustion air preheat means for preheating combustion air;a combustion chamber;at least one combustion air port connecting said combustion air preheat means to said combustion chamber and providing communication therebetween;primar

[ We claim:] [1.] An industrial material heating furnace comprising:combustion air preheat means for preheating combustion air;a combustion chamber;at least one combustion air port connecting said combustion air preheat means to said combustion chamber and providing communication therebetween;primary injection means for introducing a first portion of a fuel into a combustion air stream flowing through said at least one combustion air port and forming a primary flame, said primary injection means connected to said at least one combustion air port; andsecondary injection means for introducing a remaining portion of said fuel into said combustion chamber and forming an oxygen deficient zone proximate said primary flame, said secondary injection means disposed in a same horizontal plane as said primary injection means at a distance from a bottom of said at least one combustion air port downstream of said primary injection means and connected to one of said at least one combustion air port and a wall of said combustion chamber, proximate an exit end of said at least one combustion air port.