Multi-flame burner and method for heating a workpiece

Abstract

A multi-flame burner includes burner heads which are set up to generate at least one burner flame directed along a respective flame axis when supplied with a fuel, wherein the flame axes of respectively adjacent burner heads are inclined relative to each other. A method for preheating a workpiece, in particular a pipe or large-diameter pipe, is provided.

What is claimed is: 
     
         1 . A multi-flame burner with a plurality of burner heads and accompanying connection pipes which are set up to generate at least one burner flame directed along a respective flame axis when supplied with a fuel, characterized in that at least half of the connection pipes are offset such that the flame axes of respectively adjacent burner heads are inclined relative to each other. 
     
     
         2 . The multi-flame burner according to  claim 1 , characterized in that all the connection pipes are offset. 
     
     
         3 . The multi-flame burner according to  claim 1 , characterized in that the offset connection pipes exhibit an offset angle of 30° to 60°. 
     
     
         4 . The multi-flame burner according to  claim 1 , characterized in that each of the connection pipes are pivoted with a respective connection nozzle by way of a screw joint, wherein a respective other end of each of the connection nozzles is secured to a shared feed line and can be supplied with the fuel through the shared feed line. 
     
     
         5 . The multi-flame burner according to  claim 1 , characterized in that the plurality of burner heads are provided in at least two groups (A, B) of burner heads, wherein the burner heads of at least a first group (A) are each arranged alternately to the burner heads of at least one other group (B), and the flame axes of the burner heads of at least the first group (A) are inclined relative to the flame axes of the burner heads of at least the one other group (B). 
     
     
         6 . The multi-flame burner according to  claim 5 , in which the burner heads within each of the groups (A, B) are each arranged in the same direction or in a direction parallel to each other. 
     
     
         7 . The multi-flame burner according to  claim 4 , in which the burner heads each exhibit flame axes which are axially and/or radially inclined in relation to a perpendicular on a center line of the shared feed line. 
     
     
         8 . The multi-flame burner according to  claim 7 , wherein respectively adjacent ones of the plurality of burner heads are inclined to each other by an angle of from 50° to 45°. 
     
     
         9 . The multi-flame burner according to  claim 1 , characterized in that a gas supply device supplies the multi-flame burner with at least one gaseous fuel selected from at least one of an acetylene-containing fuel mixture, an acetylene-(compressed) air-mixture, and an acetylene-oxygen mixture. 
     
     
         10 . The multi-flame burner according to  claim 1 , characterized in that a feed line configured as a bent shaft is connected to each one of the connection pipes. 
     
     
         11 . The multi-flame burner according to  claim 10 , characterized in that the feed line is constructed from a material comprising stainless steel. 
     
     
         12 . A method for preheating a workpiece, in particular a pipe or large-diameter pipe, in which a multi-flame burner according to  claim 1  is used, and burner flames generated by the multi-flame burner are directed at the workpiece.