Title: Systems and methods to reduce reductant consumption in exhaust aftertreament systems

Abstract

Systems, apparatus and methods are provided for reducing reductant consumption in an exhaust aftertreatment system that includes a first SCR device and a downstream second SCR device, a first reductant injector upstream of the first SCR device, and a second reductant injector between the first and second SCR devices. NOx conversion occurs with reductant injection by the first reductant injector to the first SCR device in a first temperature range and with reductant injection by the second reductant injector to the second SCR device when the temperature of the first SCR device is above a reductant oxidation conversion threshold.

Inventors:

Gupta, Aniket; Cunningham, Michael J.

Issue Date:

Tue Feb 14 00:00:00 EST 2017

Research Org.:

Cummins Inc. Columbus, IN (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1343762

Patent Number(s):

9567888

Application Number:

14/461,952

Assignee:

Cummins Inc.

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B01D46/0027 - {with additional separating or treating functions}
B01D53/9418 - {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
B01D53/9431 - {Processes characterised by a specific device}
B01D53/9486 - {for storing hydrocarbons}
B01D53/9495 - {Controlling the catalytic process}

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

F01N13/009 - {having two or more separate purifying devices arranged in series}
F01N13/0093 - {the purifying devices are of the same type}
F01N2560/06 - the means being a temperature sensor
F01N2560/08 - the means being a pressure sensor
F01N2560/14 - having more than one sensor of one kind
F01N2610/02 - the substance being ammonia or urea
F01N2610/1453 - Sprayers or atomisers
F01N2610/146 - Control thereof, e.g. control of injectors or injection valves
F01N2900/0416 - using the state of a sensor, e.g. of an exhaust gas sensor
F01N2900/1602 - Temperature of exhaust gas apparatus
F01N2900/1621 - Catalyst conversion efficiency
F01N2900/1622 - Catalyst reducing agent absorption capacity or consumption amount
F01N3/02 - for cooling, or for removing solid constituents of, exhaust
F01N3/0205 - {using heat exchangers}
F01N3/023 - using means for regenerating the filters, e.g. by burning trapped particles
F01N3/035 - with catalytic reactors {, e.g. catalysed diesel particulate filters}
F01N3/0807 - {by using absorbents or adsorbents}
F01N3/0814 - {combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts}
F01N3/0821 - {combined with particulate filters
F01N3/0835 - {Hydrocarbons}
F01N3/0842 - {Nitrogen oxides}
F01N3/103 - {Oxidation catalysts for HC and CO only}
F01N3/208 - {Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

Y02T10/12 - Technologies for the improvement of indicated efficiency of a conventional ICE

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DOE Contract Number:  

EE0004125

Resource Type:

Patent

Resource Relation:

Patent File Date: 2014 Aug 18

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING; 33 ADVANCED PROPULSION SYSTEMS