Assembly and method for injecting a gaseous combustion agent

Abstract

An assembly for injecting a gaseous combustion agent into a combustion zone, the assembly having a chamber having an inlet, through which the agent is introduced into the assembly; at least one primary injector configured to convey a primary flow of the agent from the chamber toward the combustion zone, at least one secondary injector for conveying a secondary flow of the agent from the chamber toward the combustion zone, a pressure detector; a regulating; and a control system connected to the pressure detector and to the regulating system, the control system controlling the regulating system so that the flow section of the at least one secondary passage is regulated as a function of the pressure or of the variation in pressure detected by the pressure detector.

1 .- 15 . (canceled) 
     
     
         16 . An assembly for injecting a gaseous combustion agent into a combustion zone, which gaseous combustion agent is selected from gaseous fuels and gaseous oxidants, the assembly comprising:
 a chamber comprising an inlet, through which the agent is introduced into the assembly;   at least one primary injector configured to convey a primary flow of the agent from the chamber toward the combustion zone and for injecting said primary flow into the combustion zone, said at least one primary injector being fluidly connected to the chamber by means of at least one primary passage;   at least one secondary injector for conveying a secondary flow of the agent from the chamber toward the combustion zone and for injecting said secondary flow into the combustion zone, said at least one secondary injector being fluidly connected to the chamber by means of at least one secondary passage;   a pressure detector for detecting a gas pressure or a variation in gas pressure in the chamber;   a regulating system for regulating a flow section of the at least one secondary passage; and   a control system connected to the pressure detector and to the regulating system, the control system controlling the regulating system so that the flow section of the at least one secondary passage is regulated as a function of the pressure or of the variation in pressure detected by the pressure detector.   
     
     
         17 . The assembly as claimed in claim  1 , wherein the control system is configured to control the regulating system so that the gas pressure in the chamber is located in a predetermined pressure zone or so that the gas pressure in the chamber corresponds to a value that is predetermined by regulating the flow section of the at least one secondary passage. 
     
     
         18 . The assembly as claimed in claim  1 , wherein the regulating system is provided with at least one valve configured to regulate the flow section of the at least one secondary passage. 
     
     
         19 . The assembly as claimed in claim  1 , comprising at least one pair of a primary injector with a secondary injector, in which pair one from among the primary injector and the secondary injector surrounds the other one from among the primary injector and the secondary injector. 
     
     
         20 . The assembly as claimed in claim  1 , comprising at least two primary injectors and/or at least two secondary injectors. 
     
     
         21 . An installation comprising a plurality of assemblies as claimed in claim  1 , the installation comprising a common control system that is connected to the pressure detector of each assembly and that is configured to control the regulating system of each assembly as a function of the gas pressure or of the variation in gas pressure detected by the pressure detector of said assembly. 
     
     
         22 . A burner comprising an assembly as claimed in claim  1  for injecting a gaseous combustion agent into a combustion zone, which gaseous combustion agent is selected from a gaseous fuel and a gaseous oxidant, and at least one additional injector for injecting an additional fluid into the combustion zone. 
     
     
         23 . The burner as claimed in  claim 22 , comprising a block with an inlet face and an outlet face opposite the inlet face, in which burner the assembly is attached to the inlet face of the block so that the injectors of the burner are positioned in one or more perforations passing through the block of the inlet face to the outlet face. 
     
     
         24 . The burner as claimed in  claim 23 , wherein the primary and secondary injectors of the assembly form pairs of a primary injector with a secondary injector, the pairs being positioned in at least one first perforation of the block and the at least one additional injector being positioned in at least one additional perforation of the block. 
     
     
         25 . The burner as claimed in  claim 24 , comprising at least two pairs and at least two additional injectors, wherein the pairs define a first injection plane for the fluid and wherein the injectors define a second injection plane for the additional fluid that is different from the first plane, the second plane being parallel to the first plane or being oriented so as to intersect the first plane in the combustion zone downstream of the outlet face. 
     
     
         26 . A furnace comprising an internal combustion zone and comprising at least one assembly as claimed in claim  1  for injecting a gaseous combustion agent into the internal combustion zone of the furnace, which gaseous combustion agent is selected from gaseous fuels and gaseous oxidants. 
     
     
         27 . The furnace as claimed in  claim 26  comprising a plurality of assemblies, the furnace comprising a common control system that is connected to the pressure detector of each assembly and that is configured to control the regulating system of each assembly as a function of the gas pressure or of the variation in gas pressure detected by the pressure detector of said assembly. 
     
     
         28 . A combustion method, wherein a gaseous combustion agent is injected into an internal combustion zone by means of an assembly as claimed in claim  1 , which gaseous combustion agent is selected from gaseous fuels and oxidants, in which method:
 the pressure detector of the assembly detects the gas pressure in the chamber of the assembly;   the system for regulating the assembly regulates the flow section of the at least one secondary passage; and   the system for controlling the assembly controls the system for regulating the assembly so that the flow section of the at least one secondary passage is regulated as a function of the pressure or of the variation in pressure detected by the pressure detector of the assembly.   
     
     
         29 . The method as claimed in  claim 28 , wherein the control system controls the regulating system so that the gas pressure in the chamber is located in a predetermined pressure zone or so that the gas pressure in the chamber of the assembly corresponds to a value that is predetermined by regulating the flow section of the at least one secondary passage of the assembly. 
     
     
         30 . The method as claimed in  claim 28 , wherein the gaseous combustion agent is a gaseous fuel selected from natural gas, biogas, propane, butane, the residual gases of steel-making or methane-reforming methods, hydrogen or any mixture of at least two of these gaseous fuels, or is a gaseous oxidant with an oxygen content of 21 to 100 vol %.