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Diesel engine pollutant treatment system and method

A pollutant treatment and diesel engine technology, applied in the field of diesel engine pollutant treatment system, can solve problems such as difficult CDPF work, uncertainty, CDPF regeneration efficiency decline, etc.

Pending Publication Date: 2019-02-19
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the NOx content in diesel engine exhaust is uncertain, and it is difficult to ensure the continuous and stable operation of CDPF
In addition, when the exhaust gas temperature is higher than 400°C, NO is difficult to produce NO2, and the CDPF regeneration efficiency will drop sharply

Method used

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  • Diesel engine pollutant treatment system and method
  • Diesel engine pollutant treatment system and method
  • Diesel engine pollutant treatment system and method

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Embodiment 1

[0045] Such as figure 1 As shown, the diesel engine pollutant treatment system includes a control system 1, a catalytic particulate filter CDPF b, an oxidation catalytic converter DOC and a periodic reversing pipeline 4, wherein: the two ends of the catalytic particulate filter CDPF b are respectively The first oxidation catalyst DOC a and the second oxidation catalyst DOC c are connected, and the respective free ends of the first oxidation catalyst DOC a and the second oxidation catalyst DOC c communicate with the cycle reversing pipeline 4; the cycle The reversing pipeline 4 is connected with the first oxidation catalytic converter DOC a and the second oxidation catalytic converter DOC c to form a closed circulation pipeline. Two pairs of electromagnetic valves 3 that are synchronously opened and closed respectively are arranged on the closed circulation pipeline, and are connected with the outside world. Connected exhaust gas inlet and exhaust gas outlet, two pairs of solen...

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Abstract

The invention belongs to the technical field of diesel engine particulate matter emission control post-treatment and particularly relates to a diesel engine pollutant treatment system and method. According to the diesel engine pollutant treatment system, periodic reversing pipeline connection DOC+CDPF+DOC is adopted, by means of control of a control system, the treatment system capable of performing periodic reversing is formed, the system makes own filter bodies and honeycomb ceramic carriers inside the DOC+CDPF+DOC perform self-sustaining heat storage and exothermic processes utilizing chemical reactions generated by organic pollutants in tail gases or replenishing trace amount of atomized fuel oil, and trace amount of atomized oil droplet is controlled to be sprayed into a pipeline, thetemperature inside the DOC+CDPF+DOC system is maintained between 500-650 DEG C, chemical reaction residue, incombustible inorganic salt and other ashes accumulated on a wall flow type passage are removed utilizing reverse flowing, particle catcher DPF continuous regeneration can be realized, and meanwhile, particulate matter, CO, HC and soluble organic matter SOF can be disposed.

Description

technical field [0001] The invention belongs to the post-processing technical field of diesel engine particle emission control, and in particular relates to a diesel engine pollutant treatment system and method. Background technique [0002] Diesel particulate filter (DPF, Diesel particulate filter) is the most effective after-treatment technology for diesel engines to reduce particulate matter (PM) emissions. Diesel particulate matter is mainly composed of three parts, namely dry soot (Dry Soot, DS), soluble organic matter (Soluble Organic Fraction, SOF), and sulfate, in which the mass fraction of dry soot is about 40% to 50%, and soluble organic matter The mass fraction is about 35% to 45%, and the mass fraction of sulfate is about 5% to 10%. DPF is a physical filter, and the PM captured by the filter is deposited in the DPF, which will increase the exhaust back pressure of the diesel engine and lead to the deterioration of the power and economy of the diesel engine. The...

Claims

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Application Information

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IPC IPC(8): F01N3/022F01N3/025F01N3/035F01N3/20F01N3/28
CPCF01N3/0222F01N3/0253F01N3/035F01N3/20F01N3/281F01N3/2828Y02T10/40
Inventor 邓洋波陈广泉王小龙
Owner DALIAN MARITIME UNIVERSITY
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