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ANALYSIS OF SOLUBLE ORGANIC FRACTION IN
PARTICULATE MATTER FROM A DIESEL ENGINE BY
GAS CHROMATOGRAPHY-MASS SPECTROMETRY
TAN Piqiang1 HU Zhiyuan1
LU Jiaxiang2 DENG Kangyao2 LOU Diming1
WAN Gang1
(1.
School of Automobile, Tongji University,Shanghai 201804;
2.
School of Mechanical and Power Engineering, Shanghai Jiaotong
University, Shanhai 200030)
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Abstract: Soluble
organic fraction (SOF) and insoluble organic fraction (IOF) in
particulate matter (PM) emission from diesel engine are separated by
supersonic elution. The SOF in PM is analyzed by combined gas
chromatography/mass spectrometry. Experiments are carried out in a
six-cylinder, turbo-charged and intercooled, direct injection diesel
engine. A typical 13-mode operating conditions test cycle is performed
on the diesel engines. PM emissions from the diesel engine at the
thirteen operating conditions are collected. The analysis results show
the SOF emission is lower at lower loads, and rises with increasing
loads. The dominant component in the SOF is the paraffin hydrocarbon,
secondly, is the aromatic hydrocarbon. The majority of paraffin
hydrocarbon is the linear paraffin hydrocarbon. The greater parts of
aromatic hydrocarbon are the naphthalene and phenanthrene. The aromatic
hydrocarbons emission rises with increasing loads. Research results of C
atomicity in paraffin hydrocarbons show the linear paraffin hydrocarbons
(from Tetradecane to Heptadecane) are almost burned up at lower loads,
and some components of the SOF are not directly from fuel, but from
lubricant oil or middle polymerization products of fuel. More fuel
supply leads to more paraffin hydrocarbons emission at higher loads, and
some components of the SOF are from fuel decomposing at high
temperature. Research results of C atomicity in aromatic hydrocarbons
show most of aromatic hydrocarbons have higher C atomicity are burned up
at higher loads, and more compounds of aromatic hydrocarbons are seen at
lower loads.
Key
words: Gas
chromatography-mass spectrometry Paraffin hydrocarbon
Aromatic hydrocarbon Soluble organic fraction Particulate
matter
Diesel engine
CLC No: TK421.5
国家重点基础研究发展规划(2001CB209205)和中国博士后科学基金(2005037151)资助项目. Received 20050518,
received in revised form 20051001
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