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US 5,154,599 AGranted
Method for apparatus for combusting fuel in a combustion chamber
OwnerJoachim Wunninginventor
Life of this patent
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Abstract
To avoid high NOx emissions, the fuel is oxidized with an extremely high exhaust gas recirculation ration substantially without flames and without pulsations.
Claims31
A method for combusting fuel in a combustion chamber, which fuel is oxidized with hot combustion air in the presence of recirculated exhaust gases, characterized in that
- exhaust gases from which useful heat dissipated laterally with respect to flow of said recirculated exhaust gases has previously been removed from the system, are mixed with the hot combustion air in an exhaust gas recirculation ratio of r.ltoreq.2 (the exhaust gas ratio being defined as the ratio between the flow rates of the recirculated exhaust gases and of combustion air), in that
- said mixture of exhaust gas and combustion air is kept at a temperature that is higher than the ignition temperature, and in that
- the mixture of exhaust gas and combustion air is then brought together with the fuel, forming an oxidation zone in which a substantially flameless and pulse-free oxidation takes place in the combustion chamber.
An apparatus for combustion of a fuel in a combustion chamber having nozzles for combustion air that re-aspirates exhaust gases by injector action, having air guide means for delivering hot combustion air to the nozzles, having a fuel delivery device, characterized in that
- said apparatus has nozzle device means (4, 48) for producing substantially flameless and pulse-free oxidation of the fuel by a suitable disposition and embodiment of said nozzle device means (4, 48) and by provision of a re-aspiration by said nozzle device means of exhaust gases from the combustion chamber (1), at an exhaust gas recirculation ratio of r>2, and means for mixing the hot combustion air emerging from the nozzle device means (4, 48) with the re-aspirated exhaust gases that have partly cooled in the combustion chamber (1) at a resultant temperature which is, at least, sufficient to produce ignition, and
- said apparatus has fuel delivery device means (15, 41) for delivering the fuel to said mixture to an oxidation zone (19) in said combustion chamber and forming in the combustion chamber (1) in co-operation with said nozzle device means (4, 48), said substantially flameless and pulse-free oxidation of the fuel results.
Dependencies are inferred from the claim text.