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A gas burner for discharging a mixture of a gaseous fuel and combustion air into a combustion chamber wherein the mixture is burned and flue gases are formed comprises a burner body having a peripheral wall defining a combustion air supply passage having a central axis and having an orifice communic

A gas burner for discharging a mixture of a gaseous fuel and combustion air into a combustion chamber wherein the mixture is burned and flue gases are formed comprises a burner body having a peripheral wall defining a combustion air supply passage having a central axis and having an orifice communicating with the combustion chamber. Primary gaseous fuel is injected in a central part of the combustion air supply passage, and secondary gaseous fuel is injected through pipes in the combustion air supply passage peripherally distributed about the primary gaseous fuel injection. Conduits for recycling the flue gases are disposed in the combustion air supply passage and associated with the secondary gaseous fuel injection. The secondary gaseous fuel is injected into the conduits, the conduits have an axis extending parallel to the central axis and an orifice along their axis at one end thereof, the orifice communicating with the combustion chamber. An end of the conduits opposite to the one end communicate with a portion of the combustion chamber surrounding the peripheral wall of the combustion air supply passage through openings in the peripheral wall, and a flame stabilizer is arranged at the orifice of the combustion air supply passage.

대표청구항 ▼

A method of operating a gas burner for discharging a mixture of a gaseous fuel and combustion air into a combustion chamber wherein said mixture is burned and flue gases are formed, which comprises the steps of (a) supplying combustion air to the combustion chamber along a passage having a central a

A method of operating a gas burner for discharging a mixture of a gaseous fuel and combustion air into a combustion chamber wherein said mixture is burned and flue gases are formed, which comprises the steps of (a) supplying combustion air to the combustion chamber along a passage having a central axis through a discharge orifice communicating with the combustion chamber, (b) injecting primary and secondary gaseous fuel inside said passage along axes extending approximately parallel to the central axis, the injection of the secondary gaseous fuel being peripherally distributed about the injection of the primary gaseous fuel, (c) recycling the flue gases exclusively through conduits disposed within said passage into which the secondary gaseous fuel is injected, (1) a portion of the flue gases being received by orifices at one end of the conduits communicating with a portion of the combustion chamber peripherally surrounding the combustion air supply passage, and recycled through orifices at an end of the conduits opposite to the one end and communicating with the combustion chamber, (d) arranging a flame stabilizer within the orifice of the combustion air supply passage, and (e) disposing the orifices at the end of the conduits opposite the one end and the injection of the primary gaseous fuel close to the orifice of the passage for supplying combustion air and at a level with the flame stabilizer whereby a combustion zone is created externally of said passage by flames produced by the injected primary and secondary gaseous fuel.