| Abstrakt: |
Due to the usage of off-road engines for a variety of applications, the contributions of their emission levels also increased, as do those of on-road engines. Therefore, the need for offroad engine emission reduction is essential. To overcome the aforementioned concern, it is a must to have clean diesel technologies such as Fuel Injection Equipment (FIE), Turbocharger with Intercooler (TCIC), Cooled Exhaust Gas Recirculation (C-EGR), and after-treatment systems like Diesel Oxidation Catalyst (DOC), Selective Catalytic Reduction (SCR), and Diesel Particulate Filter (DPF). In this paper, during the conversion of a 15 kW naturally aspirated engine to a 27 kW TCIC engine, the after-treatment system configurations and their influence on emission reduction performance to meet the upcoming diesel engine emission norms are studied. Initially, emission testing is carried out with the DOC catalyst for three different Pt catalyst configurations. Following the testing, a 1.0-liter DOC with a catalyst loading of 1 g/cuft is selected. Furthermore, using the selected DOC specifications, the performance of 4.7-liter DPF volume with Pt catalyst and 3.7-liter SCR specifications with Zeolite catalyst is studied using GT-SUIT software simulation. The maximum soot mass limit of 8 gm is simulated for the selected 4.7-liter DPF based on this simulation study. Further, in order to improve DPF inlet gas temperature for soot regeneration, an advanced Nanox (7% YPSZ) coating is applied to the DOC outer shell (Nanox top coat layer of460-480 microns) and tested, for heat retention performance with coating. [ABSTRACT FROM AUTHOR] |
