Systems and methods for dry chemical reductant insertion in aftertreatment systems
AssigneeCummins Emission Solutions Inc.
InventorsMatthew K. Volmerding, Christopher T. Brown, Ulises Mondragon, Vincent McDonell
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Abstract
A reductant insertion system for an after treatment system configured to decompose constituents of an exhaust gas, includes: a dry reductant tank configured to contain a dry reductant; a reductant delivery line configured to operatively couple the dry reductant tank to the after treatment system for delivery of the dry reductant to the after treatment system; and a pressurized gas source configured to communicate the dry reductant to the after treatment system through the reductant delivery line using pressurized gas.
Claims9
A reductant insertion system for an aftertreatment system configured to decompose constituents of an exhaust gas, comprising:
- a dry reductant tank configured to contain a dry reductant;
- a reductant delivery line configured to operatively couple the dry reductant tank to the aftertreatment system for delivery of the dry reductant into a flow path of the exhaust gas flowing through the aftertreatment system;
- and
- a pressurized gas source configured to communicate the dry reductant to the aftertreatment system through the reductant delivery line using pressurized gas, wherein the pressurized gas source comprises an exhaust gas recirculation line coupled to a first end of the reductant delivery line, the pressurized gas being recirculated exhaust gas;
- a reductant communication line coupling the dry reductant tank to the reductant delivery line;
- and
- a dry reductant feeder coupled to the reductant communication line and configured to communicate the dry reductant from the dry reductant tank to the reductant delivery line via the reductant communication line.
A reductant insertion system for an aftertreatment system configured to decompose constituents of an exhaust gas, comprising:
- a dry reductant tank configured to contain a dry reductant;
- a reductant delivery line configured to operatively couple the dry reductant tank to the aftertreatment system for delivery of the dry reductant into a flow path the exhaust gas flowing through the aftertreatment system;
- and
- a pressurized gas source configured to communicate the dry reductant to the aftertreatment system through the reductant delivery line using pressurized gas, wherein the pressurized gas source comprises a compressed gas source coupled to the reductant delivery line and configured to provide compressed gas therethrough to the aftertreatment system;
- a reductant communication line operatively coupling the dry reductant tank to the reductant delivery line;
- a dry reductant feeder coupled to the reductant communication line and configured to communicate the dry reductant from the dry reductant tank to the reductant delivery line via the reductant communication line;
- and
- an eductor coupled to the reductant delivery line downstream of the reductant communication line, wherein the pressurized gas source is coupled to the reductant delivery line via the eductor, the eductor configured to generate suction in the reductant delivery line for delivering the dry reductant to the aftertreatment system via the reductant delivery line;
- wherein a first end of the reductant delivery line upstream of the reductant communication line is open to atmosphere.
A method for inserting dry reductant into an exhaust gas flowing through an aftertreatment system, the method comprising:
- determining an operating condition of the exhaust gas;
- providing a pressurized gas to a reductant delivery line of a reductant insertion system, the reductant insertion system comprising:
- a dry reductant tank containing a dry reductant,
- the reductant delivery line operatively coupling the dry reductant tank to the aftertreatment system, and
- a pressurized gas source for providing the pressurized gas;
- and
- activating a dry reductant feeder of the reductant insertion system to deliver the dry reductant into a flow path of the exhaust gas flowing through the aftertreatment system via the reductant delivery line;
- wherein the pressurized gas source comprises a recirculated exhaust gas source.
Dependencies are inferred from the claim text.