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The carbonaceous process of incipient soot particles according to the residence time was investigated in a inverse diffusion flame with oxygen enrichment. Two-color-ratio pyrometry was used to measure the soot temperature. It revealed that the soot temperature corresponding to the maximum signal through 700 ㎚ band-pass filter remained between 2000 K and 2200 K below the flame height, which obtained from OH-Planar laser induced fluorescence. The C/H ratio, which is good quantitative indicator to judge the degree of carbonization, was strongly affected by the modified residence time. The modified residence time indicates conversion of the height from the beginning position of the yellow flame to the position corresponding to the temperature of 1600 K above the flame height.
Uncontrolled regeneration characteristics of two different type SiC DPFs(diesel particulate filters) were investigated by DPF test rig devised to facilitate DPF evaluation, especially for regeneration and MSL(maximum soot loading) test similar to engine dynamometer test. In order to estimate the limits of maximum filter temperature and temperature gradient causing filter fracture, such as crack or whitening, the temperature distributions inside the filter were measured by thermocouples. The maximum filter temperature was observed near the rear plane of central filter region due to heat accumulation by exothermic reaction of PM but the maximum temperature gradient occurred at the boundary of high filter temperature. These two parameters induced the different SiC DPFs to fracture with different modes, whitening and crack.
The number of vehicles employing diesel engines is rapidly rising. Accompanying this trend, application of an after-treatment system is strictly required as a result of reinforced exhaust regulations. As Diesel Particulate Filter (DPF) system is considered as the most efficient method to reduce particulate matter (PM), many automotive makers spend a lot of time to select, evaluate and adapt DPF system. Temperature, gas composition and flow rate of exhaust gas are important parameters in DPF evaluation, especially regeneration process. Engine dynamometer and segment tester are generally used in DPF evaluation, but these test methods can't reveal the effect of various parameters on real size DPF, such as O₂ concentration, amount of soot and exhaust gas temperature. Therefore in this study, DPF test Rig using diesel burner was devised to facilitate DPF evaluation at various parameters systematically and the results of two representative applications(thermal cycling and unconditional regeneration) were presented.
The performance of diesel engine is more excellent than gasoline engine"s in terms of a fuel efficiency and durability so that it can be applied to a heavy duty commercial vehicle. However, the NOx and PM emitted from the diesel engine are remained to overcome and its regulation is reinforced recently. To this reason DPF system are becoming more common from Euro-4 regulation and effective DeNOxsystem is required for satisfying future regulation. Urea-SCR in these DeNOx system is emerging as the best solution in commercial vehicle. This technique is well known since several years and derived from the exhaust gas treatment of power plants and stationary engines. Honeycomb shaped catalysts(coated catalyst) based on titanium dioxide containing active component are used predominantly. In this paper extrusive SCR catalyst without inactive support substrate is introduced and compared with coating catalyst in DeNOx performance.
While the request of diesel engine is recently increased due to its excellent fuel economy, the emission regulation becomes reinforced. In the case of EURO-6 that is started from 2014 and required 60% NOx reduction compared with EURO-5, It could be satisfied by hybrid system consist of advanced EGR(Exhaust Gas Recirculation) and aftertreatment system (LNT or SCR). Advanced EGR system have been used LP-EGR (Low Pressure Loop EGR) and HP-EGR (High Pressure Loop EGR) simultaneously. In this paper, we investigated the generation of condensate in inter-cooler according to LPL EGR application in TCI diesel engine.