Engine system having mixing mechanism for exhaust and injected fluid and engine exhaust treatment strategy
AssigneeElectro-Motive Diesel, Inc.
InventorsXiao Fu, Mahesh Munirajappa, Deep Bandyopadhyay, Haridasa Raghavendra Tantry, Thean Mani Rajan Kanagaraj
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Abstract
An engine system includes an internal combustion engine having an exhaust system with an SCR aftertreatment mechanism and a urea injector upstream the aftertreatment mechanism. A mixing mechanism is positioned fluidly between the urea injector and the aftertreatment mechanism and includes a turbulator and a swirler structured to increase mixing of the urea and exhaust gases. Related methodology is also disclosed.
Claims20
An engine system comprising:
- an internal combustion engine including an engine housing defining a plurality of engine cylinders;
- and
- an exhaust system coupled with the engine housing and including an exhaust conduit having an exhaust inlet, an exhaust outlet, a fluid injector structured to inject a fluid into the exhaust conduit, and an aftertreatment mechanism coupled with the exhaust conduit;
- the exhaust system further including a mixing mechanism positioned fluidly between the fluid injector and the aftertreatment mechanism, and having a turbulator positioned within a flow path of exhaust and injected fluid through the exhaust conduit at an upstream location, and a swirler positioned within the flow path at a downstream location.
A mixing mechanism for an exhaust aftertreatment system comprising:
- an exhaust conduit including an upstream end structured to receive a flow of exhaust gas and an injected fluid, and a downstream end structured to convey the flow of exhaust gas and injected fluid to an aftertreatment mechanism;
- a turbulator mounted within the exhaust conduit at an upstream location and including flow impingement surfaces structured to induce turbulence in the flow of exhaust gas and injected fluid;
- and
- a swirler positioned within the exhaust conduit at a downstream location and including flow impingement surfaces structured to induce swirl in the flow of exhaust gas and injected fluid.
A method of treating exhaust from an internal combustion engine comprising:
- injecting a fluid into exhaust passing through an exhaust conduit;
- feeding a flow of the exhaust and injected fluid toward an outlet of the exhaust conduit structured to fluidly connect with an aftertreatment mechanism;
- and
- increasing mixing of the exhaust gas and injected fluid at least in part by impinging the flow upon turbulence-inducing surfaces of a turbulator within the exhaust conduit, and impinging the turbulated flow upon swirl-inducing surfaces of a swirler within the exhaust conduit, prior to discharging the flow from the outlet.
Dependencies are inferred from the claim text.