Diesel engine exhaust aftertreatment system based on high-chromium stainless steel and treatment method

A high-chromium stainless steel and exhaust after-treatment technology, which is applied in the direction of exhaust treatment, electronic control and electrical control of exhaust treatment devices, can solve the problem that the exhaust after-treatment system is difficult to meet the national VI emission regulations of diesel locomotives, and achieves structural Simple, reduce PM and NOx pollution, optimize the effect of filter structure

Inactive Publication Date: 2019-05-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that it is difficult for the existing exhaust gas post-treatment system to meet the national six emission regulations for diesel locomotives, and it is difficult for the existing diesel vehicle particle filter to work efficiently under conditions such as high temperature corrosion at low cost

Method used

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  • Diesel engine exhaust aftertreatment system based on high-chromium stainless steel and treatment method
  • Diesel engine exhaust aftertreatment system based on high-chromium stainless steel and treatment method

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Embodiment 1

[0026] Such as figure 1 As shown, the first embodiment of the present invention provides a diesel engine exhaust aftertreatment system based on high-chromium stainless steel, including:

[0027] Oxidation catalyst 19, particle trap 18 and selective catalytic reduction device 16 arranged in sequence on the exhaust pipeline 3 of diesel engine 8, and several temperature sensors and pressure sensors 2 for detecting temperature and pressure values ​​in various places in the pipeline; The filter element carrier 17 of the particulate trap 18 is a metal fiber braid made of high-temperature-resistant and corrosion-resistant high-chromium stainless steel, and the oxidation catalyst 19 and the particulate trap 18 are integrated to form a continuous regenerative trapping device.

[0028] It also includes the EGR valve 6 located on the connecting pipeline between the intake manifold 10 of the diesel engine 8 and the exhaust manifold 7, the fuel pump / electromagnetic injection valve 11 locat...

Embodiment 2

[0033] This embodiment provides an exhaust gas post-treatment method based on the high-chromium stainless steel-based diesel engine exhaust post-treatment system described in Example 1, and its exhaust pollutant control process is as follows:

[0034] Control the EGR valve 6 and the fuel pump / solenoid injection valve 11 through the control unit 15 to set the EGR rate and fuel injection timing, optimize the internal combustion, and reduce the PM and NO in the exhaust gas as much as possible x content;

[0035] When there is less PM (soot particulate matter) deposition in the diesel particulate filter (DPF) 18, the exhaust gas of the diesel engine 8 first passes through the oxidation catalyst (DOC) 19, CO and HC are being oxidized, and the temperature of the exhaust gas increases, and at the same time NO is oxidized to NOx , its catalytic properties enable PM to be violently oxidized at 200°C in the subsequent particle filter (DPF);

[0036] The pressure inside the DPF is monit...

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Abstract

The invention discloses a diesel vehicle China VI continuous regenerative filter and selective catalytic reduction combined system based on high temperature and corrosion resistant high-chromium stainless steel. The system comprises a diesel oxidation catalyst (DOC), a diesel particulate matter filter (DPF) and a selective catalytic reduction system (SCR) which are arranged on an exhaust pipe, temperature sensors, pressure sensors, flow sensors, a data acquisition module and a control unit. PM and NOx in exhaust are controlled through cooperative EGR valve control and internal combustion control of a fuel supply system. A filter material of the DPF adopts metal fiber braided fabric; and the high temperature and corrosion resistant high-chromium stainless steel can stand in a high-temperature and strong-corrosion atmosphere for a long time due to the low expansion coefficient of the stainless steel, compression and tensile stress produced due to radial and axial temperature gradients ofthe DPF can be effectively reduced, and the situation that deformation of the DPF causes cracks and cracking, and consequentially, the PM filter efficiency is dropped sharply is avoided.

Description

technical field [0001] The present invention relates to a diesel engine exhaust post-treatment system and method, especially a combined system of continuous regeneration capture (DOC+DPF) and selective catalytic reduction (SCR) for national six diesel vehicles based on high-temperature-resistant and corrosion-resistant high-chromium stainless steel Disclosed are an exhaust gas treatment system and method that meet the National VI emission regulations for diesel locomotives. Background technique [0002] There are three ways to control the emission pollution of diesel locomotives, which are pre-treatment purification, in-engine purification and post-treatment purification. Among them, the after-treatment purification technology is to make the exhaust gas discharged from the combustion chamber be purified in the exhaust system. [0003] The key to the diesel engine emission problem is how to reduce NO x and PM, but NO for diesel x It is a contradictory relationship with PM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N13/00F01N3/20F01N3/022F01N9/00F02D41/00F02D41/30F02D41/02F01N3/025
CPCY02T10/12Y02T10/40Y02A50/20
Inventor 熊树生江仁埔张峰毓
Owner ZHEJIANG UNIV
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