Method and device for cleaning an exhaust gas flow of a combustion engine

A technology of internal combustion engine and exhaust flow, which is applied in the field of exhaust flow devices and exhaust gas flow of exhaust gas booster internal combustion engines, and can solve the problem of reducing the proportion of nitrogen oxides

Active Publication Date: 2011-03-23
MAN TRUCK & BUS AG
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it should be noted here that due to the thermodynamic NO / NO 2 The equilibrium is on the NO side, so the NO 2 The share in the total nitrogen oxides decreases with increasing temperature

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for cleaning an exhaust gas flow of a combustion engine
  • Method and device for cleaning an exhaust gas flow of a combustion engine
  • Method and device for cleaning an exhaust gas flow of a combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] exist figure 1 2 schematically shows the use of the method according to the invention and a first embodiment of the device according to the invention for purifying the exhaust gas flow of a one-stage supercharged internal combustion engine 1 by means of an exhaust gas turbocharger 2 . The exhaust gas turbocharger 2 has an exhaust gas turbine 3 and a supercharger 4 . Charge air 5 is supercharged by means of supercharger 4 , wherein supercharger 4 is driven by means of exhaust gas turbine 3 .

[0040] Upstream of the exhaust gas turbine 3, the exhaust gas flow 6 from the internal combustion engine 1 branches into a main exhaust gas flow 6' and an exhaust gas partial flow 6". A variable throttle mechanism 7 configured as a valve. Viewed in the flow direction, a further variable throttle mechanism 8 is arranged in the exhaust gas subflow 6 ″. A reactor 9 is arranged downstream of the variable throttle 8 in the exhaust gas split 6 ″. Upstream of the reactor 9 there is a me...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention relates to a method and a device for cleaning an exhaust flow of a combustion engine, wherein, the nitrogen oxide is removed from an exhaust flow by means of selective catalytic reduction (SCR), wherein, the exhaust flow is divided or branched to a main exhaust flow or an exhaust bypass at the upstream of at least one SCR catalyst for conveying the precursor substance of catalyst to the exhaust bypass. The precursor substance of the catalyst is converted to a reducing agent in a reactor. The reducing agent is conveyed out from the reactor by means of the exhaust bypass and is conveyed to the main exhaust flow at the upstream of the SCR catalyst device, wherein, the exhaust bypass is provided with an obstructing and / or throttling mechanism. According to the invention, at least one blocking and / or throttling mechanism is configured in the main exhaust flow. Furthermore the blocking and / or throttling mechanism is operated according to a preset reaction parameter at a state of limited idle speed and / or low-load operation, namely, the main exhaust flow is blocked or throttled definitively on one hand, and the exhaust bypass is blocked with a limited quality definitively.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 for cleaning the exhaust gas flow of an internal combustion engine, in particular an exhaust gas supercharged internal combustion engine. The invention also relates to a device according to the preamble of claim 19 for cleaning the exhaust gas flow of an internal combustion engine, in particular an exhaust gas supercharged internal combustion engine. Background technique [0002] For exhaust gas purification, firstly the exhaust emissions from a cold start pose problems, since the legally prescribed exhaust emission limit values ​​must also be observed after a cold engine start and thus even when the catalytic converter has not yet reached operating temperature. Of great importance here is the so-called start-up temperature of the catalytic converter. The temperature at which the catalyst reached 50% conversion was indicated as the start-up temperature. Therefore, one of the objec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00F02B37/12
CPCF02D41/0007F02B37/013F01N13/009F01N2240/40F01N2610/10F02B37/18Y02T10/144F01N2610/02F01N2900/08Y02T10/24F02B37/004F01N3/2053F01N3/208F01N2410/00F01N13/02F02D9/06F01N2410/06Y02T10/12
Inventor A·多林
Owner MAN TRUCK & BUS AG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap