Burner with steady atomization at low back pressure

Abstract

An apparatus for fuel preparation ( 100 ) for a burner ( 18 ) for regenerating a particle filter ( 16 ) of an exhaust gas aftertreatment system comprising an exhaust gas passage ( 14 ) for discharging a hot exhaust gas flow from an internal combustion engine ( 12 ), in particular a compression-ignition internal combustion engine, is proposed. The apparatus for fuel preparation ( 100 ) has an atomizing device ( 110 ) for preparing the fuel, a combustion chamber ( 116 ), an ignition device ( 26 ) and a combustion air supply ( 24 ). The combustion air supply ( 24 ) provides a primary air feed line ( 112 ) for preparing the fuel and a secondary air feed line ( 114 ) for feeding combustion air in order to produce an ignitable fuel/air mixture.

1 . An apparatus for fuel preparation ( 100 ) for a burner ( 18 ) for regenerating a particle filter ( 16 ) of an exhaust gas aftertreatment system comprising an exhaust gas passage ( 14 ) for discharging a hot exhaust gas flow from an internal combustion engine ( 12 ), wherein the apparatus for fuel preparation ( 100 ) comprises an atomizing device ( 110 ) for preparing the fuel, a combustion chamber ( 116 ), a combustion air supply ( 24 ) and an ignition device ( 26 ), characterized in that the combustion air supply ( 24 ) provides a primary air feed line ( 112 ) for preparing the fuel and a secondary air feed line ( 114 ) for feeding combustion air in order to produce an ignitable fuel/air mixture. 
     
     
         2 . The apparatus for fuel preparation ( 100 ) according to  claim 1 , characterized in that a pressure regulating valve ( 118 ) is disposed in at least one of the primary and secondary air feed lines ( 112 ,  114 ). 
     
     
         3 . The apparatus for fuel preparation ( 100 ) according to  claim 2 , characterized in that the pressure regulating valve ( 118 ) is a mechanical pressure regulating valve. 
     
     
         4 . The apparatus for fuel preparation ( 100 ) according to  claim 2 , characterized in that the pressure regulating valve ( 118 ) is a control valve. 
     
     
         5 . The apparatus for fuel preparation ( 100 ) according to  claim 2 , characterized in that the combustion air supply ( 24 ) takes place via the primary and the secondary air feed line ( 112 ,  114 ) when the pressure regulating valve ( 118 ) is open. 
     
     
         6 . The apparatus for fuel preparation ( 100 ) according to  claim 5 , characterized in that the primary air feed line ( 112 ) opens out into the atomizing device ( 110 ) and the secondary air feed line ( 114 ) opens out into the combustion chamber ( 116 ). 
     
     
         7 . The apparatus for fuel preparation ( 100 ) according to  claim 5 , characterized in that the primary air feed line ( 112 ) and the secondary air feed line ( 114 ) open out into the atomizing device ( 110 ). 
     
     
         8 . The apparatus for fuel preparation according to  claim 1 , characterized in that fuel is injected into at least one of the primary or secondary air feed lines ( 112 ,  114 ) and the fuel/air mixture produced is supplied to the atomizing device ( 110 ). 
     
     
         9 . The apparatus for fuel preparation ( 100 ) according to  claim 1 , characterized in that the combustion air supply ( 24 ) comprises a metering valve and the fuel is supplied in metered fashion by a fuel metering valve ( 124 ), wherein a plurality of valves ( 118 ,  122 ,  124 ) is combined into one valve block.