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Aftertreatment system of before-turbine urea injection and control method thereof

A technology of urea injection and control method, which is applied in the direction of electronic control of exhaust gas treatment device, exhaust gas treatment, diagnosis device of exhaust gas treatment device, etc. And other issues

Pending Publication Date: 2019-09-10
WEICHAI POWER CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at cold start, the exhaust gas temperature is low, which cannot meet the demand for pyrolysis and hydrolysis of urea, resulting in NO X emissions increase, making it difficult to achieve NO X Precise Control of Emissions

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  • Aftertreatment system of before-turbine urea injection and control method thereof

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Embodiment Construction

[0031] One of the cores of the present invention is to provide a post-treatment system of urea injection before the swirl to reduce low-temperature NO X emissions, to meet the requirements of future ultra-low emission regulations.

[0032] Another core of the present invention is to provide a control method of the post-treatment system based on the above-mentioned pre-vortex urea injection.

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] see figure 1 , figure 1 A schematic structural diagram of ...

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Abstract

The invention relates to an aftertreatment system of before-turbine urea injection and a control method thereof. The aftertreatment system comprises a turbosuperchager, an SCRF system and an SCR system which are sequentially arranged on an engine exhaust pipeline, a first reducing agent nozzle is formed in an upstream pipeline of the turbosuperchager, a second reducing agent nozzle is arranged ona pipeline between the SCRF system and the SCR system, during cold starting or low-temperature condition, according to the aftertreatment system, the first reducing agent nozzle is arranged on the upstream portion of the turbosuperchager, the exhaust temperature before the turbosuperchager is used for achieving in-advance pyrolysis and hydrolysis of the urea, the SCRF system is subjected to ammonia storage and pretreatment, the NOX content in the tail gas can be reduced, in the high-temperature condition, the first reducing agent nozzle and the second reducing agent nozzle eject the reducing agent at the same time, the NOX conversion efficiency under the high temperature is ensured, the NOX content in the tail gas can be reduced, and the requirement of ultra-low emission regulations in thefuture can be met.

Description

technical field [0001] The invention relates to the technical field of engine aftertreatment, in particular to an aftertreatment system and a control method for urea injection before a turbo. Background technique [0002] With the increasingly stringent automobile emission regulations, the aftertreatment system with SCR (Selective Catalyst Reduction abbreviation, Selective Catalyst Reduction Reactor) has become the mainstream technology for reducing emission pollution. The method of reducing emission pollution by the post-treatment system with SCR is to reduce nitrogen oxides by injecting urea into the SCR, thereby reducing emissions and meeting the requirements of emission regulations. [0003] On the basis of SCR, SCRF technology is further developed. SCRF refers to coating SCR catalyst on DPF (abbreviation of Diesel Particulate Filter, particle trap), also known as SCR on Filter, SDPF, etc. After adopting SCRF, the layout of the post-treatment system is usually to arrang...

Claims

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Application Information

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IPC IPC(8): F01N3/035F01N3/20F01N5/02F01N11/00F01N13/00
CPCF01N3/035F01N3/2066F01N3/208F01N3/2006F01N5/02F01N11/00F01N11/002F01N13/008F01N2610/02F01N2610/1453F01N2340/06F01N2560/026Y02T10/12Y02T10/40
Inventor 郭圣刚王晓华
Owner WEICHAI POWER CO LTD
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