Study On The Infulence Of Different Fuels On The Exhaust Emissions From Diesel Engine

In view of vehicle fuel standards lagging behind the vehicle emissions standardsand the rapid development of alternative energy for vehicles, it is very important toestablish an effective evaluation system, which can evaluate the the quality of fuel onthe influence of the emission performance of diesel engine.This paper based on thedifferent emission standards of diesel engines which meet different technical solutions,and39groups of the engine bench-tests were carried out using the23kinds of oil.This paper researched on the influence of different fuel quality on diesel enginecombustion characteristics, power, fuel consumption, the emission of thecharacteristic curve, the emission of regulation cycle (THC, CO, NOX and PM), theSOF in the particles, PAHs in the SOF, VOCs of ETC cycle and the gaseous and solidorganic pollutants of SVOCs at designated point. Here are the main results:1. On the basis of a large number of valid tests including the sample injectionmode, sample volume, oven temperature program，ion source temperature, and otherchromatographic and mass spectrometric parameters, trace analysis method of PAHsin the SOF was established in this paper. The minimum method detection limit is0.1ng/mL, and recoveries are in the range of81.9-101.3%.2. The SVOCs sampling device which appearance and interface are identical withparticulate sampling filter paper bracket is designed. This device controls thesampling flow rate and time through the control of CVS, and does data integrationcalculation through the PUMA system. At the same time, accurate sampling of thegaseous and solid components in SVOCs at any condition is realized on it.3. Nowadays regulation cycle condition is the only effective way to evaluateengine emission, as the emission of characteristic curve can’t completely reflectregulations cycle emission trends. To meet the corresponding standard of emissionlevels, engine must use the fuel of corresponding emission standards. In the actualresearch, using a higher standard fuel can effectively reduce NOxand particlesemissions of diesel engine.4. The PAHs toxic equivalent quantity （TEQ）should be considered whileevaluating the PAHs emissions of engine particulate. In the evaluation of the VOCs ofGuo3diesel engine exhaust pollutants,96kinds of organic ingredients are detected,including46kinds of alkane,6kinds of olefin, and17kinds of aromatic hydrocarbon.5. Through the semi volatile organic compounds (SVOCs)research of burning Guo3diesel and FT oil on Guo3diesel engine, the results found that with theincrease of the proportion of FT, the proportion of n-alkanes in SVOCs increase, andthe n-alkanes emission of FT is about1.5-4times of Guo3diesel. Pristane（Pr）andphytane（Ph） emissions levels while burning FT diesel are obviously lower thanGuo3diesel. With the increase of the proportion of FT diesel in mixed fuel, Pr and Phemission decrease, and the typical PAHs emission also decrease. PAHs quantitativeanalysis results in the SVOCs show that the the amount of gaseous PAHs is dozens oftimes higher than the solid particle PAHs...