Infinitely variable injector for improved sncr performance

Abstract

A system for controlling a reagent flow to a furnace in a SCNR process includes at least one injection distribution module (IDM) for supplying water to a plurality of injection lances, metering valves for supplying a NOx reducing agent to the plurality of injection lances, wherein the reagent injection rate of each injection lance is controlled by one metering valve such that a reagent concentration in each injection lance is adjustable and variable from one another. A method for controlling a reagent flow to a furnace includes providing at least one IDM, and for each IDM, providing a plurality of injection lances in communication with the IDM, supplying water to the plurality of injection lances through the IDM and supplying a NOx reducing agent through metering valves, wherein each metering valve controls the reagent injection rate to one injection lance.

1 - 13 . (canceled) 
     
     
         14 . A system for controlling a reagent flow to a furnace during fuel combustion in a selective non-catalytic reduction (SNCR) process, said system comprising:
 a port arranged in a water line and in communication with a water supply;   at least one master metering valve in communication with said port for supplying a reagent solution and controlling a reagent injection rate to said port, wherein the reagent solution and water are mixed in said port to create a diluted reagent solution;   at least one injection distribution module in communication with said port for receiving the diluted reagent solution; and   a plurality of injection lances in communication with said at least one injection distribution module that supplies the diluted reagent solution to said plurality of injection lances,   wherein each of said plurality of injection lances is in communication of an individual reagent metering valve positioned upstream of each of said injection lances and downstream of said port, and   wherein said individual reagent metering valve controls an injection rate of the diluted reagent solution into each of said injection lances.   
     
     
         15 . The system of  claim 14 , wherein each of said plurality of injection lances passes through a hole in a wall of the furnace,
 wherein each of said injection lances is adapted to inject liquid therein to a chamber of the furnace, and   wherein each of said injection lances is pivotable with respect to the wall of the furnace about at least one axis, so that an angle at which the liquid is injected by each of said injection lances into the furnace is variable.   
     
     
         16 - 22 . (canceled) 
     
     
         23 . A method for controlling a reagent flow to a furnace during fuel combustion in a selective non-catalytic reduction (SNCR) process, the method comprising:
 supplying a reagent solution to a port through at least one master metering valve, and controlling a reagent injection rate to the port, wherein the reagent solution and water are mixed in the port to create a diluted reagent solution;   supplying the diluted reagent solution to at least one injection distribution module in communication with the port; and   supplying the diluted reagent solution to a plurality of injection lances in communication with said at least one injection distribution module,   wherein each of said injection lances is in communication with an individual reagent metering valve positioned upstream of said each of the injection lances and downstream of the port, and   wherein said individual reagent metering valve controls an injection rate of the diluted reagent solution into said each of said injection lances.   
     
     
         24 . The system of  claim 14 , wherein a reagent amount in the diluted reagent solution supplied to each of said injection lances is separately adjustable by the individual reagent metering valve in the communication of said each of the injection lances. 
     
     
         25 . The system of  claim 14 , wherein a reagent concentration in the diluted reagent solution is adjusted by said at least one master metering valve. 
     
     
         26 . The system of  claim 14 , wherein reagent concentrations in the diluted reagent solution supplied to said injection lances are the same. 
     
     
         27 . The system of  claim 26 , wherein a reagent amount in the diluted reagent solution supplied to each of said injection lances is separately adjustable by the individual reagent metering valve in the communication of said each of the injection lances. 
     
     
         28 . The system of  claim 14  further comprising a controller in communication with the individual reagent metering valve for adjusting a pulse width of the individual reagent metering valve to control the injection rate. 
     
     
         29 . The system of  claim 14 , wherein the individual reagent metering valve includes a pulse width modulated solenoid valve. 
     
     
         30 . The system of  claim 14 , wherein said at least one master metering valve includes a pulse width modulated solenoid valve. 
     
     
         31 . The system of  claim 14  further comprising another master metering valve in communication with the port for supplying the reagent solution to the port. 
     
     
         32 . The method of  claim 23 , wherein a reagent amount in the diluted reagent solution supplied to each of the injection lances is separately adjustable by the individual reagent metering valve in the communication of each of said injection lances. 
     
     
         33 . The method of  claim 23  further comprising adjusting a reagent concentration in the diluted reagent solution via said at least one master metering valve. 
     
     
         34 . The method of  claim 23 , wherein reagent concentrations in the diluted reagent solution supplied to said injection lances are the same. 
     
     
         35 . The method of  claim 34 , wherein a reagent amount in the diluted reagent solution supplied to each of said injection lances is separately adjustable by the individual reagent metering valve in the communication of said each of said injection lances. 
     
     
         36 . The method of  claim 23  further comprising adjusting a pulse width of the individual reagent metering valve to control the injection rate. 
     
     
         37 . The method of  claim 23  further comprising supplying the reagent solution to the port through another master metering valve; 
     
     
         38 . The method of  claim 23 , wherein each of said injection lances passes through a hole in a wall of the furnace,
 wherein each of said injection lances is adapted to inject liquid therein to a chamber of the furnace, and   wherein said each of the injection lances is pivotable with respect to the wall of the furnace about at least one axis, so that an angle at which the liquid is injected by each of said injection lances into the furnace is variable.