Method for burning refining residues

Abstract

The method of the invention for combustion of residues from refining petroleum in a boiler comprising a hearth and injectors is characterized in that cooled gas containing oxygen is injected into the hearth in the hottest region of said hearth. Injection into the very hot region of the hearth cracks tar or aromatic polycyclic hydrocarbons and converts them into basic compounds that are easily combustible and therefore less pollutant.

1 - 14 . (canceled) 
     
     
         15 . Method for combustion of residues from refining petroleum in a boiler having a hearth and injectors, said method comprising the steps of:
 injecting gas containing oxygen into the hearth in a hottest region of said hearth;   simultaneously injecting recycled flue gases into the hottest region of the hearth.   
     
     
         16 . Method according to either  claim 15 , wherein injection is effected by injectors disposed in corners of the hearth. 
     
     
         17 . Method according to  claim 15 , wherein injection is effected by injectors disposed on lateral walls of the hearth. 
     
     
         18 . Method according to the preceding claim, wherein the injectors are placed at the middle of each lateral wall of the hearth. 
     
     
         19 . Method according to the preceding claim, wherein the injectors are placed on each of the four lateral walls. 
     
     
         20 . Method according to  claim 18 , wherein the injectors are placed on two facing walls. 
     
     
         21 . Device for injecting gas into a hearth of a tangential heating boiler for implementation of the process according to claim  1 , wherein said device is installed in trunking for re-circulating flue gases and has concentric gas injection tubes. 
     
     
         22 . Device according to the preceding claim, wherein said device is disposed substantially perpendicular to the walls of the hearth in a horizontal plane. 
     
     
         23 . Device according to the preceding claim, wherein said device is substantially inclined vertically toward the bottom of the hearth. 
     
     
         24 . Device according to  claim 21 , wherein said device has a cooling circuit. 
     
     
         25 . Device according to  claim 21 , wherein said device is swept by gases. 
     
     
         26 . Device according to  claim 21 , wherein said device is retractable. 
     
     
         27 . Device according to  claim 21 , wherein said device has a gas pilot light.