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Exhaust gas treatment system

A technology for exhaust gas treatment and exhaust flow, which is applied in the direction of exhaust gas treatment, gas treatment, exhaust device, etc., and can solve problems such as no involvement

Inactive Publication Date: 2018-08-31
SCANIA CV AB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, said application does not address the issues associated with the use of high sulfur fuels, or how to regenerate sulfur poisoned exhaust treatment systems

Method used

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Embodiment Construction

[0041] In the following, the terms "downstream" and "upstream" are used in reference to the general direction of exhaust gas flow, from the exhaust gas treatment inlet, via the oxidation catalyst assembly, particulate filter and SCR device, to the exhaust gas treatment outlet.

[0042] Hereinafter, low-sulfur fuel refers to fuel with a sulfur content of 15 ppm or less. High-sulfur fuel refers to fuel with a sulfur content greater than 100 ppm.

[0043] According to the system for exhaust gas treatment and the method of regenerating the exhaust gas treatment system of the present invention, it is possible to actively regenerate the soot-filled particulate filter even if the system platinum group metal (PGM) catalyst is poisoned due to the use of high sulfur fuel. The regeneration may be performed without resorting to increasing engine load in order to raise the temperature of the exhaust gas flow leaving the vehicle's combustion engine. Fuel economy is thus improved and vehicl...

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Abstract

The invention relates to an exhaust gas treatment system (4) and a method for regenerating such an exhaust gas treatment system. The exhaust gas treatment system comprises: an oxidation catalyst assembly (10); a particulate filter (12) arranged downstream of the oxidation catalyst assembly; a reducing agent dosing device (14) arranged downstream of the particulate filter (12); and a selective catalytic reduction device (16) arranged downstream of the reducing agent dosing device (14). The oxidation catalyst assembly (10) comprises a first oxidation catalyst (18) arranged to selectively oxidisehydrocarbons present in the exhaust stream, at least partially, with substantially no concomitant oxidation of sulfur oxides present in the exhaust stream; and a second oxidation catalyst (20) arranged downstream of the first oxidation catalyst (18), arranged to oxidise hydrocarbons or partially oxidized hydrocarbons having slipped through the first oxidation catalyst (18), as well as to concomitantly oxidise NO to NO2. The system can be fuel-effectively regenerated when running on high-sulfur fuels in order to regenerate the particulate filter (12) as well as remove sulfur species depositedon the system catalysts. The invention further relates to a vehicle comprising such an exhaust gas treatment system.

Description

technical field [0001] The present disclosure generally relates to an exhaust treatment system that includes an oxidation catalyst assembly, a particulate filter, a reductant metering device, and a selective catalytic reduction device. The exhaust gas treatment system may eg be for exhaust gas treatment of vehicles, especially heavy vehicles such as buses or trucks. The present disclosure also relates to a method for regenerating a particulate filter of an exhaust treatment system. Background technique [0002] Internal combustion engines combust a fuel and air mixture in order to generate drive torque, for example to power a heavy vehicle such as a bus or truck. The combustion process produces exhaust gas, which exits the engine and is diverted to an exhaust treatment system. For diesel engines, the exhaust gas from the internal combustion engine mainly consists of nitrogen-containing gases (NO X ), carbon dioxide (CO 2 ), carbon monoxide (CO), hydrocarbons (HC) and par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/96
CPCB01D53/944B01D53/96B01D2251/20B01D2255/1021B01D2255/20723B01D2255/9032B01D2257/404B01D2257/702Y02C20/10B01D53/9477F01N13/0093F01N3/00F01N3/0885F01N3/103F01N3/106F01N3/20F01N2570/12F01N2570/04F01N2510/067B01D53/9418B01D2251/2067B01J23/22B01J23/40B01J23/92B01J23/96B01J35/0006B01J35/04B01J38/02F01N3/0253F01N3/035F01N3/2066F01N2250/02F01N2560/06F01N2570/14
Inventor D·雷蒙
Owner SCANIA CV AB
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