Exhaust gas treatment device with a burner for generating a flame for the combustion of process gas

Abstract

The invention relates to a burner as well as to a waste gas treatment device for generating a flame for the combustion of process gas, especially of contaminants, in a combustion chamber, in each case having feed lines for a fuel gas and for an oxidizing agent so that they flow into a pre-mixing chamber, and having an ignition device for igniting the gas mixture contained in the pre-mixing chamber. According to the invention, a sensor for detecting and/or monitoring the flame is provided on the burner, especially at one end of the burner situated opposite from the pre-mixing chamber.

1 . A waste gas treatment device ( 22 ), comprising:
 a combustion chamber ( 32 ) that has at least one feed ( 16 ) through which a process gas to be thermally treated is introduced into the combustion chamber ( 32 ) and at least one discharge ( 31 ) from which thermally treated waste gases are discharged out of the combustion chamber ( 32 ); and   at least one burner ( 1 ) for generating a flame ( 33 ) for the combustion of process gas in the combustion chamber ( 32 ) comprising:
 feed lines ( 5 ,  6 ) for a fuel gas and for an oxidizing agent configured so that the fuel gas and oxidizing agent flow into a pre-mixing chamber ( 12 ) to form a gas mixture, wherein each of the fuel gas and the oxidizing agent are fed into the pre-mixing chamber ( 12 ) of the burner ( 1 ) in a substantially cylindrical pipe ( 2 ,  3 ) configured as outer ( 2 ) and inner ( 3 ) pipes of different lengths that are concentric relative to each other with the outer pipe ( 2 ) extending axially beyond the length of the inner pipe ( 3 ), and with the fuel gas being carried in one of the outer pipe ( 2 ) or in the inner pipe ( 3 ), and the oxidizing agent being carried in the other of the outer pipe ( 2 ) or in the inner pipe ( 3 ), wherein the inner pipe ( 3 ) and the outer pipe ( 2 ) each are electrically conductive, and wherein the premixing chamber ( 12 ) is within the outer pipe ( 2 ) at or near an outlet end of the outer pipe ( 2 ), and wherein the inner pipe ( 3 ) has a lower end, 
 an insulator ( 7 ) configured to electrically insulate the inner pipe ( 3 ) from the outer pipe ( 2 ), 
 an ignition device ( 10 ,  11 ) for igniting the gas mixture contained in the pre-mixing chamber ( 12 ), wherein the ignition device ( 10 ,  11 ) has at least one projection ( 10 ) arranged on the lower end of the inner pipe ( 3 ) and oriented towards an outlet of the burner ( 1 ) in order to generate an ignition spark from the inner pipe ( 3 ) to the outer pipe ( 2 ) in the pre-mixing chamber ( 12 ), and 
 a sensor ( 4 ) for detecting and/or monitoring the flame ( 33 ) arranged at one end of the burner ( 1 ) situated opposite from the pre-mixing chamber ( 12 ). 
   
     
     
         2 . The waste gas treatment device ( 22 ) according to  claim 1 , wherein the burner ( 1 ) as assembled is situated above the combustion chamber ( 32 ), and approximately perpendicular to the waste gas treatment device ( 22 ). 
     
     
         3 . The waste gas treatment device ( 22 ) according to  claim 1  wherein a feed line for a flushing gas, especially nitrogen, is configured so that the flushing gas flows over porous sintered elements ( 18 ) at the ends of the feed means ( 16 ) for the process gas in order to displace particles. 
     
     
         4 . The waste gas treatment device ( 22 ) according to  claim 1 , further comprising liquid feed lines ( 23 ) on the side wall of the combustion chamber ( 32 ). 
     
     
         5 . The waste gas treatment device ( 22 ) according to  claim 1 , wherein at least one feed line ( 25 ) is provided for a reaction gas that may comprise an oxidizing agent and/or a reducing agent. 
     
     
         6 . The waste gas treatment device ( 22 ) according to  claim 1 , wherein at least two burners ( 1 ) are arranged on the combustion chamber ( 32 ), and each burner ( 1 ) is associated with a separate feed ( 37 ,  38 ) for the fuel gas or for the oxidizing agent, respectively. 
     
     
         7 . The waste gas treatment device ( 22 ) according to  claim 1 , further comprising: a regulation and/or control unit ( 39 ) to regulate and/or control the feed ( 37 ,  38 ) for the fuel gas or for the oxidizing agent, especially as a function of a signal from the sensor ( 4 ) that is arranged on one of the burners ( 1 ) and that serves to detect and/or monitor the flame ( 33 ) of the respective one of the burners ( 1 ). 
     
     
         8 . The waste gas treatment device ( 22 ) according to  claim 6  wherein the at least one sensor ( 4 ) is an ionization electrode ( 40 ). 
     
     
         9 . The waste gas treatment device ( 22 ) according to  claim 1 , wherein the sensor ( 4 ) is an optical sensor with an optical viewing field, and wherein the flame ( 33 ) falls within the optical viewing field of the sensor ( 4 ). 
     
     
         10 . The waste gas treatment device ( 22 ) according to  claim 9 , wherein the burner ( 1 ) has a longitudinal axis and wherein the optical sensor ( 4 ) has a viewing axis that coincides approximately with the longitudinal axis of the burner ( 1 ) so that the sensor ( 4 ) detects and monitors the flame ( 33 ) through the inner pipe ( 3 ) of the burner ( 1 ). 
     
     
         11 . The waste gas treatment device ( 22 ) according to  claim 9 , wherein a glass pane ( 8 ) is arranged between the burner ( 1 ) and the sensor ( 4 ). 
     
     
         12 . The waste gas treatment device ( 22 ) according to  claim 1 , further comprising: a tubular connecting piece ( 34 ) between the outer pipe ( 2 ) and the sensor ( 4 ) which tubular connecting piece ( 34 ) holds the feed line ( 5 ) to the inner pipe ( 3 ) for the fuel gas or for the oxidizing agent. 
     
     
         13 . The waste gas treatment device ( 22 ) according to  claim 12 , wherein a glass pane ( 8 ) is arranged at one end of the substantially cylindrical connecting piece ( 34 ), and the inner pipe ( 3 ) and/or the outer pipe ( 2 ) that is electrically insulated by an insulator ( 7 ) is arranged at the other end. 
     
     
         14 . The waste gas treatment device ( 22 ) according to  claim 12 , wherein the connector for the ignition device ( 11 ) is provided between the connecting piece ( 34 ) and the outer pipe ( 2 ) of the burner ( 1 ). 
     
     
         15 . The waste gas treatment device ( 22 ) according to  claim 1 , wherein the burner ( 1 ) further comprises a flame holder ( 13 ) in the pre-mixing chamber ( 12 ) configured to generate turbulence. 
     
     
         16 . The waste gas treatment device ( 22 ) according to  claim 1 , further comprising: a temperature-resistant wire ( 14 ) arranged in the pre-mixing chamber ( 12 ) of the burner ( 1 ) and projecting into the optical viewing field of the sensor ( 4 ). 
     
     
         17 . The waste gas treatment device ( 22 ) according to  claim 1 , wherein the ignition device ( 10 ,  11 ) further comprises at least one projection ( 35 ) that is arranged on the outer pipe ( 2 ) and that is oriented towards the inside in order to generate an ignition spark between the inner pipe ( 3 ) and the outer pipe ( 2 ). 
     
     
         18 . The waste gas treatment device ( 22 ) according to  claim 1 , wherein the ignition device ( 10 ,  11 ) as an alternative to the projection ( 10 ) has an electrode ( 36 ) in the pre-mixing chamber ( 12 ) of the burner ( 1 ) that is configured to generate an ignition spark in the pre-mixing chamber ( 12 ) of the burner ( 1 ). 
     
     
         19 . The waste gas treatment device ( 22 ) according to  claim 1 , further comprising: a flame holder ( 13 ) in the pre-mixing chamber ( 12 ) of the burner in order to generate turbulence.