Burner for regeneration of diesel particulate filter

Abstract

Provided is a burner for regenerating a diesel engine particulate filter. The burner includes: a combustion chamber for receiving a exhaust gas through connecting pipes from a diesel engine; a carburetor including a gasifying chamber for gasifying a liquid fuel, an atomizer for atomizing and supplying the liquid fuel to the gasifying chamber, and a convey air inflow line for flowing an external air into the gasifying chamber for conveying the gasified fuel into a mixed gas supplying unit; a mixed gas supplying unit for mixing the gasified fuel with an external air for burning, and supplying the mixed gaseous fuel to the combustion chamber; a combustor disposed in the combustion chamber for injecting the mixed gaseous fuel; an igniter for igniting the mixed gaseous fuel injected from the combustor; and a flame sensor for sensing whether the flame is made on the surface of the combustor or not.

1 . A burner for regenerating a diesel engine particulate filter, comprising: a combustion chamber for receiving a exhaust gas from a diesel engine through at least one of connecting pipes connected to an exhaust gas channel of the diesel engine; a carburetor including a gasifying chamber for gasifying a liquid fuel, an atomizer for atomizing the liquid fuel into fine liquid drops and supplying the atomized liquid fuel to the gasifying chamber, and a convey air inflow line for forming a channel to flow an external air into the gasifying chamber for conveying the gasified fuel into a mixed gas supplying unit; a mixed gas supplying unit for mixing the gasified fuel from the gasifying chamber with an external air for burning, and supplying the mixed gaseous fuel to the combustion chamber; a combustor made of porous material and disposed in the combustion chamber for injecting the mixed gaseous fuel supplied from the mixed supplying unit; an igniter for igniting the mixed gaseous fuel injected from the combustor; and a flame sensor for sensing whether the flame is made on the surface of the combustor or not. 
   
   
       2 . The burner of  claim 1 , wherein the convey air inflow line has a predetermined portion disposed to pass the exhaust gas channel of the diesel engine for heating an external air flowing along the convey air inflow line through heat-exchanging with the exhaust gas outputted from the diesel engine and flowing the heated air into the gasifying chamber. 
   
   
       3 . The burner of  claim 1 , wherein the mixed gas supplying unit includes: a mixing chamber for forming a mixed gas by mixing an external air for burning and a gasified fuel; a burning air inflow line communicated with the mixing chamber for forming a channel for flowing an external air for burning into the mixing chamber; a fuel inflow line communicated with the mixing chamber and the gasifying chamber for forming a channel for flowing a gasified fuel into the mixing chamber; a mixed gas inflow line communicated with the mixing chamber and the combustion chamber for forming a channel for flowing the mixed gas from the mixing chamber into the combustion chamber. 
   
   
       4 . The burner of  claim 3 , wherein an external air inflow passage formed in the burning air inflow line and the mixing chamber are formed in a ventury shape that has a cross-section gradually reduced along the flow of the external air for burning. 
   
   
       5 . The burner of  claim 3 , wherein the burning air inflow line has a predetermined portion disposed to pass the exhaust gas channel of the diesel engine for heating an extern air flowing along the convey air inflow line through heat-exchanging with the exhaust gas outputted from the diesel engine and flowing the heated air into the mixing chamber. 
   
   
       6 . The burner of  claim 1 , further comprising an electric control unit for electrically feedback-controlling: a temperature and a pressure of at least one spot in the combustion chamber; an amount of flowing external air for conveying into the gasifying chamber, a temperature and pressure inside the gasifying chamber; a temperature, a pressure, and an amount of flowing an external air for burning into the mixed gas supplying unit; an amount of flowing a liquid fuel supplied from the fuel pump; a temperature and a pressure of an exhaust gas after passing through a diesel particulate filter; and operations of the combustor, the igniter, the flame sensor and the fuel pump. 
   
   
       7 . The burner of  claim 6 , wherein the gasifying unit includes: an electric valve for controlling an amount of external air for conveying, which is supplied through the convey air inflow line, in response to the electric control unit; and a temperature and pressure sensor for sensing a temperature and pressure in the gasifying chamber and providing the sensing signal to the electric control unit. 
   
   
       8 . The burner of  claim 6 , wherein the mixed gas supplying unit includes: an electric valve for controlling an amount of flowing an external air for burning, which is supplied through the burning air inflow line, in response to the electric control unit; and a temperature and pressure sensor for sensing a temperature and pressure of the external air for burning and providing the sensing signal to the electric control unit. 
   
   
       9 . The burner of  claim 6 , further comprising: a clean air supplying line communicated with an outside for supplying an external air into an ignite member of the igniter; and an electric valve for controlling an amount of flowing the external air supplied from the clean air supplying line in response to the electric control unit. 
   
   
       10 . The burner of  claim 6 , further comprising: a clean air supplying line communicated with an outside for supplying an external air to a flame sensing member of the flame sensor; and an electric valve for controlling an amount of flowing the external air supplied from the clean air supplying line in response to the electric control unit. 
   
   
       11 . The burner of  claim 6 , wherein the electric control unit drives the burner when a difference of pressures detected at a front and a rear of a diesel particulate filter is greater than a predetermined threshold, and stops the burner when the difference is smaller than the predetermined threshold. 
   
   
       12 . The burner of  claim 1 , wherein an inner surface of the combustion chamber is lined with at least one of ceramic wool, creak wool or fire brick. 
   
   
       13 . The burner of  claim 1 , wherein the porous material of the combustor is one selected from the group consisting of mat type metal fiber, ceramic and foam metal. 
   
   
       14 . The burner of  claim 13 , wherein the combustor has one of a cylinder shape, a cone shape, and a rectangle pipe shape. 
   
   
       15 . The burner of  claim 1 , wherein the combustor further includes a porous supporting member coupled to the inner side of the porous material for holding the shape of the porous material. 
   
   
       16 . The burner of  claim 1 , wherein the connecting pipe is connected to the side wall of the combustion chamber. 
   
   
       17 . The burner of  claim 16 , wherein the connecting pipe is connected to be separated from a center of a cross-section of the combustion chamber so as to swirl an exhaust gas along an inside wall of the combustion chamber. 
   
   
       18 . The burner of  claim 1 , wherein the connecting pipe is connected to a front wall of the combustion chamber. 
   
   
       19 . The burner of  claim 16 , further comprising: a supplementary air inflow line for forming a passage to flow a supplementary air into the surface of the combustor from the outside; and a supplementary air swirler disposed between the inside wall of the supplementary air inflow line and the surface of the combustor for swirling the supplementary external air to the surface of the combustor. 
   
   
       20 . The burner of  claim 16 , further comprising a porous cone shaped flame holder disposed to surround an external circumference of the combustor. 
   
   
       21 . The burner of  claim 20 , further comprising an exhaust gas swirler disposed between the inside wall of the flame holder and the surface of the combustor for swirling the exhaust gas flew into the combustion chamber. 
   
   
       22 . The burner of  claim 21 , further comprising a guide plate vertically disposed at one end of the flame holder for guiding an exhaust gas, which is flew into the combustion chamber, to pass the exhaust gas swirler.