System and method for enhancing internal combustion engine aftertreatment applications by superheated fuel injection
The present invention provides for a system and process for enhancing internal combustion engine aftertreatment applications by superheated fuel injection. The system includes a fuel supply upstream of a fuel injector of an aftertreatment application. The system also includes a heater for heating the fuel in the fuel supply. A temperature controller can be used to maintain the heated fuel in a liquid form. When liquid fuel in the pressurized fuel supply is heated, then upon exiting the injector the pressure of the fuel drops rapidly, resulting in atomization of the liquid. The vaporized fuel thereby produced is comprised of extremely small droplets and is elevated in temperature, which reduces the possibility of condensation on internal surfaces of the aftertreatment system. This fine droplet size and resistance to condensation enhances the NOx conversion efficiency of adsorbers. Problems related to premature aging of catalysts and fuel penalties can also be reduced.
1. A system for enhancing internal combustion engine aftertreatment applications by superheated fuel injection comprising:
a NOx adsorber;
a nozzle operatively coupled to the NOx adsorber;
a pressurized fuel supply located upstream of the nozzle; and
a heater operatively coupled to the pressurized fuel supply for super heating fuel in the pressurized fuel supply so the fuel vaporizes when injected by the nozzle into the NOx adsorber.
2. The system of claim 1 wherein the distance between an end of the pressurized fuel supply and the nozzle is minimized to avoid heat loss.
3. The system of claim 1 wherein the heater is a heating tape.
4. The system of claim 1 further comprising:
a temperature controller operatively coupled to the heater for maintaining the fuel at a temperature that keeps the fuel in a liquid form until injection into the NOx adsorber.
5. The system of claim 1 wherein the nozzle is a fuel injector.
6. The system of claim 1 wherein the vaporized fuel is in sub-micron size droplets.