US 10,744,458 B2Granted

Thermally integrated compact aftertreatment system

AssigneePACCAR Inc

InventorRandal A. Goffe

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Abstract

A thermally integrated catalyst aftertreatment exhaust system includes a flow channel that directs diesel exhaust through a diesel oxidation catalyst unit that includes a diesel oxidation catalyst, by a doser that introduces DEF into the diesel exhaust, through a mixing chamber that includes a static metallic mixer coated with a DEF hydrolysis catalyst, and through an SCR unit that includes an SCR catalyst. The diesel oxidation catalyst converts a portion of diesel exhaust into water, carbon dioxide, or nitrogen dioxide. The DEF hydrolysis catalyst facilitates hydrolysis of the mixed DEF and diesel exhaust. The SCR catalyst facilitates reduction of NOx in the diesel exhaust. A first portion of the flow channel is in direct thermal contact with a second portion of the flow channel that houses the SCR unit such that heat from the diesel exhaust before the diesel exhaust reaches the doser is passed to the SCR unit.

Claims20

Dependent claims

A thermally integrated catalyst aftertreatment (TICA) exhaust system, comprising:

a diesel oxidation catalyst unit comprising a diesel oxidation catalyst configured to convert a portion of diesel exhaust into one or more of water, carbon dioxide, or nitrogen dioxide;
a doser configured to introduce diesel exhaust fluid (DEF) into the diesel exhaust;
a selective catalytic reduction (SCR) unit comprising an SCR catalyst configured to facilitate reduction of nitrogen oxide (NOx) in the diesel exhaust with NH3;
and
a flow channel configured to direct flow of the diesel exhaust from the diesel oxidation catalyst unit, to the doser and to the SCR unit, wherein a first portion of the flow channel is in direct thermal contact with a second portion of the flow channel that houses the SCR unit such that heat from the diesel exhaust is passed to the SCR unit,
wherein the first portion of the flow channel and the second portion of the flow channel are located around a perimeter of the SCR unit such that the flow channel is configured to direct flow of the diesel exhaust around the perimeter of the SCR unit.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/113,815Filed 27 Aug 2018 · continuation
Priority: 6 Nov 2015
Published: US 2019/0070558 A17 Mar 2019
Granted: 18 Aug 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B01D 53/9477
Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one…:…
B01D 53/9495
By catalytic processes: controlling the catalytic process
F01N 3/2066
Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing…:…
F01N 3/2892
Construction of catalytic reactors: exhaust flow directors or the like, e.g. upstream of catalytic device

Family

Application14/935,125Parent of this continuation · filed 6 Nov 2015
US 2019/0070558 A1Pre-grant publication · published 7 Mar 2019
US 10,058,819 B2Parent of this continuation
US 2017/0128885 A1Published application
US 10,744,458 B2This patent

From the US filing history. Foreign family members aren’t listed.