Inner flame 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 exhaust gas from a diesel engine; a carburetor for gasifying liquid fuel; a mixed gas supplying unit for mixing the gasified fuel with an external air, and supplying the mixed gaseous fuel to the combustion chamber; a mixed gas storing chamber disposed in the combustion chamber for receiving the mixed gaseous fuel and instantly storing the received mixed gaseous fuel; an inner flame combustor made of porous material for injecting the mixed gaseous fuel toward the inside of the inner flame combustor, and disposed in the combustion chamber to allow an exhaust gas to flow through the inner flame combustor; an igniter for igniting the mixed gaseous fuel; and a flame sensor for sensing the flame on the inner flame combustor.

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 for gasifying liquid fuel; a mixed gas supplying unit for mixing the gasified fuel from the carburetor with an external air for burning, and supplying the mixed gaseous fuel to the combustion chamber; a mixed gas storing chamber disposed in the combustion chamber for receiving the mixed gaseous fuel from the mixed gas supplying unit and instantly storing the received mixed gaseous fuel; an inner flame combustor made of porous material for injecting the mixed gaseous fuel supplied from the mixed gas storing chamber in a direction from the outside to the inside of the inner flame combustor, and disposed in the combustion chamber to allow an exhaust gas to flow through the inner flame combustor; an igniter for igniting the mixed gaseous fuel injected toward the inside of the inner flame combustor; and a flame sensor for sensing whether the flame is made on the surface of the inner flame combustor or not. 
   
   
       2 . The burner of  claim 1 , further comprising at least one of swirlers disposed at an inlet of the combustion chamber to swirl the exhaust gas so as to flow the exhaust gas into the inside of the inner flame combustor while the exhaust gas swirling. 
   
   
       3 . The burner of  claim 1 , wherein the connecting pipe is disposed in a tangential direction from the cross section of the combustion chamber in order to flow the exhaust gas into the inner flame combustor disposed in the combustion chamber. 
   
   
       4 . The burner of  claim 1  wherein the inner flame burner has a cyclone shape. 
   
   
       5 . The burner according to  claim 1 , further comprising a gas-flow uniform unit disposed between the mixed gas supplying unit and the mixed gas storing chamber in an annular shape that forms a concentric circle with the combustion chamber for making the mixed gas to uniformly flow into the mixed gas storing chamber in a radial direction of the combustion chamber. 
   
   
       6 . The burner of  claim 5 , further comprising a flow-rate uniform unit for making a flow-rate of a mixed gas uniform in a length direction of the mixed gas by sustaining the pressure distribution of the mixed gas uniformly in the length direction of the inner flame combustor. 
   
   
       7 . The burner of  claim 1 , wherein the carburetor includes: 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. 
   
   
       8 . The burner of  claim 7 , 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. 
   
   
       9 . The burner of  claim 7 , 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 mixed gas storing chamber for forming a channel for flowing the mixed gas from the mixing chamber into the mixed gas storing chamber. 
   
   
       10 . The burner of  claim 9 , 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. 
   
   
       11 . The burner of  claim 9 , wherein the burning 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 mixing chamber. 
   
   
       12 . The burner of  claim 7 , 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. 
   
   
       13 . The burner of  claim 12 , 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. 
   
   
       14 . The burner of  claim 12 , 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. 
   
   
       15 . The burner of  claim 12 , 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. 
   
   
       16 . The burner of  claim 12 , 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. 
   
   
       17 . The burner of  claim 12 , 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. 
   
   
       18 . 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. 
   
   
       19 . 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. 
   
   
       20 . The burner of  claim 19 , wherein the inner flame combustor has one selected from the group consisting of a cylinder shape, a cone shape, a rectangle pipe shape, and combination thereof, which include a hollow hole defining the exhaust gas channel. 
   
   
       21 . The burner of  claim 1 , further comprising a heat resistant metal mash separately disposed inside the inner flame combustor for radiant heat-exchanging with the inside surface of the inner flame combustor. 
   
   
       22 . The burner of  claim 1 , wherein the inner flame combustor further includes a porous supporting member for holding the shape of the porous material by being connected to the outer surface of the porous material. 
   
   
       23 . The burner of  claim 1 , wherein the igniter is one of a spark plug for igniting the mixed gas by generating electrical sparks, and a grow plug for accumulating heat at the one end.