Method for measuring median particle diameter of particles in exhaust gas of diesel engine

A measurement method and diesel engine technology, applied in the measurement field, can solve the problems of not reflecting the particle size of a single particle, expensive, and complicated measurement equipment.

Active Publication Date: 2014-03-12
JIANGSU UNIV
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Problems solved by technology

These three measurement methods all indirectly obtain the particle size and quantity through the conversion of electrical signals. The obtained particle size results are mainly the particle size of the particle group, which cannot reflect the individual particle size formed by combustion, and the measurement equipment is complicated. expensive

Method used

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  • Method for measuring median particle diameter of particles in exhaust gas of diesel engine
  • Method for measuring median particle diameter of particles in exhaust gas of diesel engine
  • Method for measuring median particle diameter of particles in exhaust gas of diesel engine

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Embodiment Construction

[0060] specific implementation plan

[0061] Describe the present invention below in conjunction with specific embodiment:

[0062] Step 1: Collect samples of particles to be tested;

[0063] The engine combustion particles in the main exhaust passage of the engine are collected by a filter membrane as the particle sample to be tested; in this embodiment, a glass fiber filter membrane is used, the sampling flow rate is controlled at 5 L / min, and the sampling time is 10 minutes.

[0064] Before the dispersion treatment, the electron microscope image of engine combustion particles is as follows figure 1 As shown, the particles are agglomerated together in the form of chains, clusters, and flocs, and it is difficult to measure the particle size of a single particle.

[0065] Step 2: Dispersion treatment of the particle sample to be tested;

[0066] Use ethanol or dichloromethane solution to extract the particle sample to be tested, the amount of solvent added is 5 times the ma...

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Abstract

The invention relates to the technical field of measurement and provides a method for measuring and calculating the median particle diameter of particles in the exhaust gas of a compression ignition engine. A method for measuring the median particle diameter of the particles in the exhaust gas of a diesel engine mainly comprises the following steps: collecting particle samples to be measured; dispersing the particle samples to be measured; acquiring an electron microscope image of dispersed particles; judging the dispersion degree of agglomerated particles; and solving the diameter of a single particle in Mi to finally obtain the median particle diameter D50 of the particles in the exhaust gas of the diesel engine. Compared with the prior art, the method has the characteristics that the particle diameter can be obtained without conversion of the current and the particle diameter; and the particles with the particle diameter of 0.1 to 0.5 micron can be intuitively obtained. Through the particle electron microscope image processing, the single particle can be distinguished, and the particle diameter measurement accuracy of the particles is improved.

Description

technical field [0001] The invention relates to the field of measurement technology, and proposes a method for measuring and calculating the median diameter of exhaust particles of a compression ignition engine. Background technique [0002] Particulate matter (PM) emitted by automobiles has become one of the main sources of atmospheric environmental pollutants. In 2013, Beijing has implemented the "Beijing V" emission standard for automobiles, and the "National IV" emission standard for automobiles will be implemented nationwide. In the more stringent emission regulations, in addition to the limitation on the quality of particulate matter emitted by vehicles, the limitation requirements on particle number (particulate number, PN) are also added. Engine particles can be divided into coarse state (1-10μm), aggregated state (100-300nm) and nuclear state (particle size less than 50nm) according to particle size. Studies by scholars at home and abroad have shown that the peaks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
Inventor 王忠李铭迪王宇成赵洋刘帅李瑞娜毛功平
Owner JIANGSU UNIV
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