Ammonia gas pressure booster

Abstract

A system and method for delivering a reductant into an engine exhaust stream for use in the reduction of NO x is disclosed. The system includes a cartridge having an interior space for storing the reductant containing material, a fluid supply line fluidly connected to the cartridge for receiving the reductant, a pressure boosting device for boosting the flow of reductant, a flow management device, and, an injector for injecting the reductant into an after-treatment system for combining with the exhaust stream. The reductant may include ammonia. Use of the pressure boosting device increases the reductant pressure into the aftertreatment system, providing for a reduction in the time to inject the reductant into the exhaust stream, while improving the distribution of reductant into the exhaust stream.

What is claimed is: 
     
         1 . A system for delivering a reductant into an engine exhaust stream, the system comprising:
 a canister having an interior space for storing a reductant containing material;   a fluid supply line fluidly connected to the canister for receiving the reductant;   a pressure boosting device for boosting the flow of reductant;   a flow management device; and,   an injector for injecting the reductant into an after-treatment system for combining with the exhaust stream.   
     
     
         2 . The system of  claim 1 , wherein the reductant containing material is an adsorbing/desorbing material. 
     
     
         3 . The system of  claim 1 , wherein the reductant is ammonia. 
     
     
         4 . The system of  claim 1 , wherein the pressure boosting device is a pump integrated into the fluid supply line. 
     
     
         5 . The system of  claim 4 , wherein the pump is positioned between the canister and the flow management device. 
     
     
         6 . The system of  claim 4 , wherein the pump increases a pressure of the reductant at the injector. 
     
     
         7 . The system of  claim 4 , wherein the pump decreases injection time of the reductant into the exhaust stream. 
     
     
         8 . A method for reducing NO x  in an exhaust gas stream of a diesel-engine vehicle, the method comprising the steps of:
 fluidly coupling components of an exhaust gas NO x  reduction system package to an engine exhaust gas system, the components comprising:
 a cartridge having an interior space for storing a reductant containing material; 
 a conduit fluidly connected to the cartridge for receiving the reductant upon release from the material; 
 a pressure boosting device for boosting the pressure of the reductant; 
 a flow management device; and, 
 an injector for injecting the reductant into the exhaust stream increasing the flow of reductant through the pump and the flow management device; 
   injecting gaseous ammonia into the engine exhaust gas system through the injector; and,   reacting the reductant with the engine exhaust gas stream reducing the level of NO x  in the exhaust gas stream.   
     
     
         9 . The method of  claim 8 , wherein the pressure boosting device is a pump integrated within the conduit and positioned between the cartridge and the flow management device. 
     
     
         10 . The method of  claim 9 , wherein the pump increases the pressure of the reductant at the injector.