Burner for diesel particulate filter regeneration

Abstract

Provided is a burner using electric discharge as an ignition source such as arc or plasma rotating with flow, and more particularly, to a DPF regenerating burner that improves ignition performance of the burner by having a metal ball on a conical electrode surface where electricity is discharged, inducing accurate electric discharge through a metal ball, and supplying a fuel-air mixture toward the metal ball. The DPF regeneration burner includes a fuel-air mixture supplying unit having an injecting unit be connected to a reaction unit to supply the fuel-air mixture to the reaction unit; and a metal ball on a circumference of the electrode to ignite the injected fuel-air mixture. The DPF regenerating burner generates electric discharge in an electrode surface where a metal ball is located. The ignition performance is improved by accurately supplying a fuel-air mixture at a location where the electric discharge is generated.

1 . A burner for regenerating diesel particulate filter (DPF) which generate rotating electric discharge such as plasma or arc by applying high voltage to a reaction unit where there is rotation flow of fuel and air and generates ignition, comprising:
 an outer casing  110  which has a hollow inside to be a portion of an exhaust pipe for connecting a Diesel particulate filter for filtering particulate matters generated from an engine, and which includes a fixing unit  111  to be coupled with the exhaust pipe in both sides;   a body  120  which is formed inside the outer casing  110  and includes a reaction unit  121 ;   an electrode supporting insulation unit  122  which is formed inside the body  120 ;   an electrode  130  whose one side is fixed to the electrode supporting insulation unit  122  and which is installed on the reaction unit  121  of the body  120 ;   a conducting bar  125  for supplying electric power to the electrode  130 ;   a supplying unit for supplying fuel and air from the fuel supplying unit  141  and the air supplying unit  140  to the reaction unit  121 ; and   an injecting unit  146  which is formed to be connected to the supplying unit and injects fuel and air to the reaction unit  121 .   
     
     
         2 . The burner of  claim 1 , wherein the supplying unit includes a fuel-air mixture supplying unit  142  for supplying a fuel-air mixture to the reaction unit  121  by being connected to the air supplying unit  140  and the fuel supplying unit  141 , and the injecting unit  146  injects the supplied fuel-air mixture to the reaction unit  121 ; and a metal ball  150  is included on a circumference of the electrode  130  to initiate electric discharge at that point and ignite the injected fuel-air mixture. 
     
     
         3 . The burner of  claim 2 , wherein the fuel-air mixture supplying unit  142  includes a rotational passage  143  between an inner wall and an outer wall of the body  120  along with a circumferential direction of the body  120 ; and the injecting unit  146  injects the fuel-air mixture passing through the rotational passage  143  to the inside of the body  120 . 
     
     
         4 . The burner of  claim 2 , wherein a cross-sectional area of the electrode  130  decreases gradually along with the moving direction of the exhaust gas. 
     
     
         5 . The burner of  claim 2 , further comprising:
 a secondary air supplying unit  160  which is connected to an outer side of the body  120  and which has an outlet end  162  be connected to the reaction unit  121  in order to supply air to the reaction unit  121 ,   wherein the secondary air supplying unit  160  includes the outlet end  162 , which is formed to be inclining at a selected angle with respect to the electrode  130 , such that air supplied through the secondary air supplying unit  160  flows in a moving direction of the exhaust gas by swirling along with a circumference of the electrode  130 .   
     
     
         6 . The burner of  claim 1 , wherein the supplying unit is formed on a center of the electrode supporting unit  122  and includes the fuel passage  123  connected to the fuel supplying unit and an air passage connected to the air supplying unit which covers a surface of the fuel passage  123 , such that the fuel and the air are mixed in end units of the fuel passage and the air passage and are supplied to the reaction unit  121 ; and since a plurality of nozzles  131  are formed on an upper portion of the electrode  130 , the mixed fuel and air moves outside the reaction unit  121  along with the nozzle  131 . 
     
     
         7 . The burner of  claim 6 , wherein the nozzle  131  is formed to be inclining at a selected angle with respect to a tangential direction of the electrode  130  such that the mixed fuel and air swirls. 
     
     
         8 . The burner of  claim 7 , wherein the secondary air supplying unit  160  including a secondary air passage  161 , which includes the outlet end  162  connected to the reaction unit  121  such that auxiliary air flows outside the electrode  130  of the reaction unit  121 , supplies air to the secondary air passage  161 ,
 wherein the secondary air supplying unit  160  is formed to be inclining at a selected angle with respect to a longitudinal direction of the body  120  such that air supplied by the secondary air supplying unit  160  swirls. 
 
     
     
         9 . The burner of  claim 1 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method. 
 
     
     
         10 . The burner of  claim 9 , wherein the body  120  includes a magnifying pipe  180  on a rear end,
 wherein the magnifying pipe  180  includes a through hole  181 . 
 
     
     
         11 . The burner of  claim 10 , wherein the magnifying pipe  180  is located in a front position of the end of the electrode  130  in an inflow direction of the exhaust gas. 
     
     
         12 . The burner of  claim 2 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method. 
 
     
     
         13 . The burner of  claim 3 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method. 
 
     
     
         14 . The burner of  claim 4 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method. 
 
     
     
         15 . The burner of  claim 5 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method. 
 
     
     
         16 . The burner of  claim 6 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method. 
 
     
     
         17 . The burner of  claim 7 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method. 
 
     
     
         18 . The burner of  claim 8 , wherein the burner  100  includes an electric heater  170  installed on the supplying unit,
 wherein the electric heater  170  is controlled by a Pulse Width Modulation (PWM) control method.