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Reductant supply system

a supply system and reductant technology, applied in the field of aftertreatment systems, can solve problems such as the increase of the load of the reductant delivery modul

Inactive Publication Date: 2015-01-22
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent text is about an aftertreatment system that includes an exhaust conduit, a selective catalytic reduction module, a reductant supply system, and a pump assembly. The reductant supply system has a reductant tank, a reductant injector, and a plurality of check valves. The pump assembly includes a reversing valve assembly and a pump unit. The system also has a back flow valve assembly and at least two header units with a reductant draw conduit and a heat exchanger. The technical effects achieve improved efficiency and control in reducing emissions from exhaust gas flows.

Problems solved by technology

Sometimes, in the large engine systems the load on the reductant delivery module may increase due to thawing time required at engine startup.

Method used

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Embodiment Construction

[0011]Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or the like parts. Referring to FIG. 1, a block diagram of an exemplary engine system 100 is illustrated, according to one embodiment of the present disclosure. The engine system 100 includes an engine 102, which may be an internal combustion engine, such as, a reciprocating piston engine or a gas turbine engine. According to one embodiment of the disclosure, the engine 102 is a spark ignition engine or a compression ignition engine, such as, a diesel engine, a homogeneous charge compression ignition engine, or a reactivity controlled compression ignition engine, or other compression ignition engines known in the art. The engine 102 may be fueled by gasoline, diesel fuel, biodiesel, dimethyl ether, alcohol, natural gas, propane, hydrogen, combinations thereof, or any other combustion fuel known in the art.

[0012]The engine 102 may include other components, such as, a fuel sys...

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PUM

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Abstract

An aftertreatment system is disclosed. The aftertreatment system includes an exhaust conduit and a selective catalytic reduction module. The aftertreatment system also includes a reductant supply system. The reductant supply system includes a reductant tank, a reductant injector, and a pump assembly. The pump assembly includes a reversing valve assembly and a pump unit. The pump assembly also includes a plurality of check valves, a pressure sensor, and a filter. Further, the reductant supply system includes a back flow valve assembly. The reductant supply system also includes at least two header units associated with the pump assembly. The at least two header units include a reductant draw conduit and at least one heat exchanger. The at least two header units also include a bag filtration assembly.

Description

TECHNICAL FIELD[0001]The present disclosure relates to an aftertreatment system, and more particularly to a reductant supply system for the aftertreatment system.BACKGROUND[0002]An aftertreatment system is associated with an engine system. The aftertreatment system is configured to treat and reduce NOx and / or other compounds of the emissions present in an exhaust gas flow, prior to the exhaust gas flow exiting into the atmosphere. In order to reduce NOx, the aftertreatment system may include a Selective Catalytic Reduction (SCR) module and a reductant delivery module.[0003]The reductant delivery module may include a tank for storing a reductant, a pump unit, reductant delivery lines, and a reductant injector. The reductant from the reductant tank may be delivered to the reductant injector via the pump unit. For large engine systems, reductant dosing may be increased as compared to that required by smaller engine systems. Sometimes, in the large engine systems the load on the reducta...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01N3/20
CPCF01N3/206F01N3/2006F01N3/2066F01N3/208F01N2610/02F01N2610/1426F01N2610/1433F01N2610/1473Y02T10/12
Inventor DRISCOLL, JAMES J.COLE, BRIAN M.SUN, JINHUI
Owner CATERPILLAR INC