Emissions of regulated and non-regulated air pollutants emitted from heavy-duty diesel vehicles and their emission tendencies
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概要
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The concentrations of 4 regulated and 18 non-regulated substances emitted from heavy-duty diesel vehicles and an engine were measured through the decreasing their emission levels and change of their emission trends, and the effects of regulations on emissions of these substances are discussed.<BR>THC and CO emissions were highly correlated with 1, 3-butadiene, benzene, formaldehyde, acetaldehyde, PM, and B [b] F emissions (<I>r</I>>0.86; <I>p</I><0.01). As for the correlations between PM emissions and SO42-or individual PAHs emissions, SO<SUB>4</SUB><SUP>2-</SUP> and B [b] F had a high correlation coefficient, but the other PAHs had low coefficients, ranging from 0.19 (<I>p</I><0.01) to 0.62 (<I>p</I><0.01). These low correlations were due to the considerable discrepancy between the emission trends of the various vehicles tested. 1-NP emission was not correlated with THC, CO, NOx, and PM emissions, and its emission trend differed from the trends of other non-regulated substances. In a D13 test cycle, the amount of SO<SUB>4</SUB><SUP>2-</SUP>-S emitted from a test vehicle equipped with an oxidation catalyst and a DPF was higher than the amount of sulfur in the consumed fuel. Because the sulfur concentration in the test fuel was low, this result suggests that sulfur in the lubricating oil contributed to the emission or that discharged SO<SUB>4</SUB><SUP>2-</SUP> in the exhaust gas accumulated on the DPF during the high-load drive mode. No marked decrease in NOx emitted from the test vehicles as a function of fuel consumption was observed. Thus, effective countermeasures to reduce NOx emissions are required. However, non-regulated air pollutant emissions from the test vehicles that meet Japan's new short-term regulations for auto-exhaust gas either were not detected or were under the limit of detection, owing to the effects of the DPF and the oxidation catalyst.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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