Reduction of diesel engine particulate matters using retrofit CEO2 diesel oxidative catalyst and partial flow diesel Particulate filter system

Name: Liu, Hai

LCSH: Automobiles -- Motors

LCSH: Automobiles -- Motors (Diesel) -- Exhaust gas

LCSH: Automobiles -- Catalytic converters

Abstract: Meeting regulatory requirements for low emissions from internal combustion engines has become increasingly difficult with traditional purification technology alone. As a result, the most widely used diesel engine exhaust after-treatmenttechnologies are DOC (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter) due to their significant reduction of NOx, Lie, CO, and PM in exhaust gas. This study specifically utilized Ce02 as the DOC catalyst and a partial-flow DPF installed after the DOC. After comparison of the pressure drop and filtration efficiency by using GT Power software, this study recommended a cell density of 200-300 CPSI, a channel length of 150-230 mm, and a hydraulic diameter of 120-240mm for the DPF of a 3L diesel engine. During this research 2 aftertreatment samples were applied based on the simulation results and experience. In-cylinder pressure sensors and crank angle encoders were used to monitor engine performance during experiments conducted at varying engine loads and RPMs. Engine testing results showed that the Ce02 DOC and DPF systems effectively reduced NOx by around 300 ppm and particulate matter by around 65%. CO and Lie were also substantially reduced at the same time. DOC and DPF systems have no significant effect on combustion pressure, fuel consumption, SFC, SEC, and thermal efficiency owing to the particulate filter causes a pressure drop of 0.2-2.3 kPa However, without DPF system, the IET is 4-6% higher than BTE; While with DPF system, ITE is 5-11% higher than BTE owing to the DPF system cause the friction loss increase between 1-6%; the friction loss increases with engine rpm increasing due to more revolution cause more friction work. Combustion trend to start earlier when engine load increasing or engine rpm decreasing. Vehicle tests at the pollution control department revealed that the DOC and DPF systems reduced PN by 4.8E+13/km, PM by 20.9mg/km, NOx by 182mg/km. Comparisons between Catalytic DPF and Non-Cat DPF showed that applying Ce02 DPF resulted in a 3mg/km reduction in PM. The study also investigated the pressure drop and filtration efficiency of a 3-litre diesel engine, revealing that a partial-flow DPF had around 50% lower back pressure than full-flow DPF at the same geometric conditions, but with an average filtration efficiency of around 30% less. Some research methods and conclusions in this paper can also provide a certain reference for other types of DPFs

King Mongkut's Institute of Technology Ladkrabang. Central Library

Address: BANGKOK

Email: Lifelong@kmitl.ac.th

Name: Chinda Charoenphonphanich

Role: Thesis Advisor

Name: Katsunori Hanamura

Role: Thesis Co-Advisor

Email : chinda.ch@kmitl.ac.th

Created: 2023

Modified: 2024-11-08

Issued: 2024-11-08

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of Engineering

Descipline: Automotive and Advanced Transportation Engineering

Grantor: King Mongkut's Institute of Technology Ladkrabang

©copyrights King Mongkut's Institute of Technology Ladkrabang

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