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Exhausted gas post-processing system

A waste gas post-treatment and waste gas technology, applied in exhaust gas treatment, exhaust equipment, mechanical equipment, etc., can solve problems such as difficulty in determining the dosage of urea

Inactive Publication Date: 2008-12-31
VOLVO LASTVAGNAR AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wall flow cordierite filters are further characterized by a considerable amount of porosity which absorbs the ammonia formed and thus makes transient urea dosing more difficult

Method used

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Embodiment Construction

[0013] An internal combustion engine 10 schematically represented in FIG. 1 comprises an engine block 11 having six piston cylinders 12 with an intake manifold 13 and an exhaust manifold 14 . Exhaust gases from the engine are led through an exhaust pipe 15 to a turbine rotor 17 of a turbocharger unit 16 . The turbine shaft 18 drives the compressor wheel 19 of the turbocharger unit, which pressurizes the intake air through the intake duct 20 and delivers the pressurized intake air to the intake manifold via the intercooler 21 Tube 13. Fuel is injected into each cylinder 12 by injection equipment (not shown). Although a six cylinder engine is illustrated in the figures, the invention may also be used in combination with other cylinder configurations.

[0014] Exhaust gas that has passed the turbocharger unit 16 continues to be directed via the exhaust pipe 22 to the oxidation catalytic converter 23 to generate NO to the exhaust flow. 2 . Downstream of the oxidation catalytic...

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Abstract

The invention relates to an exhaust gas after treatment system for treating exhaust gases from an internal combustion engine (10) . The system comprises a soot catalytic converter (40) and an SCR catalytic converter (41) , which reduces NOx- emissions by means of a reagent delivered via an injector located upstream of the SCR catalytic converter. According to the invention the soot catalytic converter (40) is located between the injector (25) and the SCR-catalytic converter (41).

Description

technical field [0001] The invention relates to an exhaust gas aftertreatment system for treating exhaust gas from an internal combustion engine, the system comprising a soot catalytic converter and an SCR catalytic converter, the SCR catalytic converter reduces the NOx emissions. Background technique [0002] Increasing demands aimed at reducing exhaust emissions from heavy-duty trucks and buses have led to more advanced exhaust aftertreatment systems. SCR (Selective Catalytic Reduction) is one such system for reducing NOx emissions in which a reactant in the form of urea / water solution is injected upstream of the SCR catalytic converter, for example. which passed NO 2 The DPF (Diesel Particulate Filter) which burns off the soot (so-called CRT, i.e. Continuous Regeneration Trap) is another system for reducing engine particulate emissions, mainly consisting of carbon. NO 2 Produced by an oxidation catalytic converter upstream of the particulate filter. [0003] There ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/035F01N3/20F01N3/28
CPCF01N1/003F01N1/006F01N1/023F01N3/0231F01N3/0335F01N3/035F01N3/106F01N3/2066F01N3/2885F01N2610/02F02B37/00F01N13/009F01N13/0097F01N13/017Y02T10/12
Inventor 格特-奥韦·沃尔斯特伦保利娜·拉姆费尔特
Owner VOLVO LASTVAGNAR AB