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Preliminary study of pulse corona discharge plasma technology to purify diesel exhaust

Author: XieJinLiang
Tutor: TangMinKang
School: Jiangxi University of Technology
Course: Safety Technology and Engineering
Keywords: Pulse Corona Low-temperature plasma The wet needle plate corona discharge Diesel engine Particle
CLC: X701
Type: Master's thesis
Year: 2008
Downloads: 25
Quote: 0
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Abstract


With the development of technology and the improvement of people's living standards, environmental protection and sustainable development has gradually become the hot issue of social concern, and also become the focus of the researchers of the study. Diesel engine for its power, high efficiency, fuel economy, etc. has been widely used. Diesel exhaust PM (soot particles) and NO_X emissions has limited the development of the diesel engine. Therefore, the study of control diesel exhaust emissions technology has great significance. In order to reduce of particles and NO_X diesel exhaust emissions, the theory of the application of low-temperature plasma theory and electrostatic dust on the use of high-voltage pulse corona discharge plasma technology purify diesel engine harmful substances carried out a preliminary study. In the design and self-developed a low-temperature plasma processing apparatus on the basis of the analysis of the characteristics of the corona charging, and the plasma purifying pollutants wet needle plate corona discharge reactor combined with rotating spark gap switch hypertension pulse power of the test program, and the the LF170-type single-cylinder diesel engine on the experimental study of a diesel particulate trap, and NO_X removed by changing various parameters of the discharge gap, the pulse voltage, pulse frequency, the study of various parameters on the purification efficiency impact of law, for the application of the technology in the processing engine emission of harmful gases do basic experimental research. And get some valuable conclusions: (1) the reactor in the case of water, right diesel exhaust purification efficiency NO_X in than the reactor in the case of water purification efficiency higher, because of the presence of the aqueous layer in the reactor so that reactor containing a large amount of gaseous molecules, the water molecules can be generated in the corona discharge under the action of the high pressure pulse active great radical These radicals promote the plasma oxidation NO_X the reaction, and water is also beneficial to the exhaust particulate matter in the removal, because the part of the particulate matter will be absorbed by water. Another reactor in the presence of the aqueous layer can also play a stable corona and provide sufficient active radical; ② pulse voltage, the pulse frequency, the engine speed, the flow of gas, the discharge gap, etc. parameters, the particulate matter and NO_X the the purifying effect has a significant impact, diesel exhaust particulate removal efficiency of 60%, NO_X removal efficiency can reach about 20%; ③ pulse voltage is higher the purification effect is more ideal (can not be higher than the breakdown voltage), exhaust The longer residence time in the reactor, the higher the removal efficiency. The higher the pulse frequency, the removal efficiency is also a corresponding increase; the ④ pulsed power supply voltage, the pulse frequency and the discharge gap are the main factors affecting particle removal and NO_X. A discharge gap optimum value of 12mm, the pulse voltage, the higher the pulse frequency, the higher the purification efficiency, little effect on the efficiency of purification of the distance between the surface and the plate electrode of the reactor; the ⑤ reactor run time is longer, the discharge-Etsu stable, the higher the efficiency. This is due to the needle-like electrode formed on the surface of a layer of nitrate aerosols, the substances can inhibit the spark discharge occurred; ⑥ high-voltage pulse corona discharge of soot formation in diesel exhaust dust adsorption capacity to achieve a higher pulse voltage without the risk of back corona phenomenon, its collection efficiency can reach 60%; Finally, purification of low-temperature plasma technology in-depth study of the diesel engine exhaust emissions Discussion and Prospect.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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