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Study on Formaldehyde Emissions Characteristic of Engine Running the Fuel Blended with Methanol

Author: XiangChunYan
Tutor: YaoChunDe
School: Tianjin University
Course: Power Machinery and Engineering
Keywords: Methanol Formaldehyde Diesel / methanol compound combustion Gasoline Catalytic Converter
CLC: TK46
Type: Master's thesis
Year: 2008
Downloads: 126
Quote: 1
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Abstract


Car as an alternative fuel, methanol due to the low cost of production, production technology mature in China has a wide range of applications, but the use of methanol fuel causes the engine exhaust in formaldehyde emissions increased. Formaldehyde is a the higher toxic substances, there is harm to the human body and the atmospheric environment. Therefore, understanding and mastery of aldehydes in the internal combustion engine exhaust emissions characteristics of control formaldehyde emissions, promote the use of the promotion of alcohol fuel is of great significance. This topic is used under acidic conditions of the 2,4 - dinitrophenylhydrazine absorption of formaldehyde in the exhaust gas, generating formaldehyde hydrazone, according to gas chromatography to analyze the content of the formaldehyde hydrazone, has been calculated to ultimately come to the formaldehyde content of the exhaust. Established a set of internal combustion engine exhaust formaldehyde detection apparatus based on this principle, and comparison according to a large number of experimental results, it is determined the sampling system and the chromatographic parameters. Detection apparatus and method of this subject focuses on the diesel / methanol compound combustion mode (diesel / methanol compound combustion, DMCC) and doped methanol gasoline exhaust in formaldehyde emissions law, comparing a large number of tests, found that the engine load, the replacement rate of methanol injection way catalytic converter, the exhaust temperature of the exhaust gas in formaldehyde emissions are present. The results show that: the DMCC, exhaust of the combustion mode the concentration of formaldehyde emission is 10 to 30 times of the original machine; highest formaldehyde emissions at the same speed and the same substitution rate of methanol under low load, medium load least formaldehyde emission, high load formaldehyde The emission center; presents an increasing trend in the low-load, with the rise of methanol replacement rate, the amount of formaldehyde generated. High load and high replacement rate of methanol, formaldehyde emissions declined slightly; same operating point sequential injection in the exhaust formaldehyde content lower than continuous injection; catalytic converter formaldehyde in the exhaust to eliminate the effect of the exhaust gas temperature big. When the exhaust temperature is below 300 ° C or higher than 410 ℃, the catalytic formaldehyde will reduce; When the exhaust temperature of 300 ° C lt; T lt; 410 ° C, catalytic formaldehyde but will increase. Burning gasoline 93 # gasoline and methanol gasoline emissions of aldehydes in the ratio of fuel (M10, M20 and M30) a comparative analysis of the results showed that: compared to pure gasoline and fuel blended with methanol, formaldehyde in the exhaust emissions increased significantly. M10, M20 can reach 2 times the M0 and M30 increase can M0 nearly seven times; three-way catalytic converter can eliminate formaldehyde emissions from the exhaust gas after the catalytic treatment of different gasoline-methanol ratio of fuel formaldehyde emissions are significantly reduced, and can be controlled in the near-zero emissions levels.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Alternative fuel internal combustion engine
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