Fuel-burning lance for burners

Abstract

The present invention relates to a lance (1) for burning fuel in burners. The lance (1) comprises a main tubular assembly (2), a pilot ignition assembly (3), and a tubular housing assembly (4). The main tub-5 ular assembly (2) comprises: a compressed air pipe (5); a first fuel pipe (6), which is arranged coaxially with and outside the compressed air pipe (5), forming a first flow space for a first fuel; and a second fuel pipe (7), which is arranged coaxially with and outside the first fuel pipe (6), form-ing a second flow space for a second fuel. The pilot ignition assembly 0 (3) is a substantially tubular lance for conveying fuel ignition means. The tubular housing assembly (4) houses the main tubular assembly (2) and the pilot ignition assembly (3).

1 . A fuel-burning lance for burners, comprising:
 a main tubular assembly, a pilot ignition assembly, and a tubular housing assembly, in which the main tubular assembly comprises:   a compressed air pipe, the compressed air pipe having two ends, a first end of the compressed air pipe having a compressed air inlet and the second end of the compressed air pipe having a compressed air nozzle, the compressed air nozzle being frustoconical with a cylindrical end and having a first set of through-holes through which the compressed air is discharged under pressure,   a first fuel pipe, which is arranged coaxially outside the compressed air pipe, forming a first flow space for a first fuel, the first fuel pipe having two ends, in which there is a first-fuel inlet close to a first end of the first fuel pipe and a second end of the first fuel pipe has a fuel nozzle that fits together externally with the compressed air nozzle of the compressed air pipe, and in which the fuel nozzle has a second set of through-holes through which the first fuel is discharged under pressure, and   a second fuel pipe, which is arranged coaxially with and outside the first fuel pipe, forming a second flow space for a second fuel,   in which the pilot ignition assembly is a substantially tubular lance for conveying fuel ignition means, and   in which the tubular housing assembly houses the main tubular assembly and the pilot ignition assembly, and   in which the first set of through-holes in fuel nozzle is similar to the second set of through-holes in the compressed air nozzle, and the first and second sets of through-holes are aligned with each other.   
     
     
         2 . (canceled) 
     
     
         3 . The lance according to  claim 1 , wherein the first set of through-holes comprises eight holes arranged circumferentially. 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . The lance according to  claim 1 , wherein the second fuel pipe has two ends, with the first end having a second-fuel inlet and the second end having a third set of through-holes through which the second fuel is discharged under pressure. 
     
     
         7 . Lance The lance according to  claim 6 , wherein the second fuel pipe also has a set of vanes arranged on the outer surface thereof near to the third set of through-holes, which are designed to generate an external air flow for burning the at least one fuel. 
     
     
         8 . The lance according to  claim 1 , wherein the pipes that make up the main tubular assembly are fastened to each other by at least one of the following:
 screwing using metal plates,   welding, and/or   threading.   
     
     
         9 . The lance according to  claim 1 , wherein the tubular housing assembly has two ends and an external combustion air inlet, with a flange at one end that positions and fastens the main tubular assembly and the pilot ignition assembly inside the tubular housing assembly. 
     
     
         10 . The lance according to  claim 9 , wherein the compressed air nozzle, the fuel nozzle, and the third set of through-holes of the second fuel pipe project beyond the second end of the tubular housing assembly, so that the first, second, and third sets of through-holes are exposed to the environment. 
     
     
         11 . The lance according to  claim 1 , wherein the first fuel is either tar or diesel, and the second fuel is liquified petroleum gas (LPG).