Design and Analysis of Diesel Exhaust After-Treatment for Heavy-Duty Vehicle Emission Control System In Workshop

Abstract

The growing number of vehicles on the road has led to a parallel expansion of auto repair workshops. However, the environmental impact of emissions from vehicle exhaust systems during maintenance procedures has often been overlooked. According to the World Health Organization, diesel engine is major contributor of six primary air pollutants comprise particle pollution, ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. Both prolonged and brief exposure to airborne toxicants yield varying toxicological consequences for humans, encompassing respiratory and cardiovascular ailments, neuropsychiatric complications, eye irritation, skin disorders, and enduring chronic illnesses like cancer The study is a second-generation pollution reduction system used for workshop of heavy-duty vehicles The primary objective is to mitigate air pollution by stabilizing the temperature of the catalytic converter. A finite element model was employed to evaluate the system's performance. Given the high temperatures generated by heavy-duty engines, multiple cooling pipes was designed to reduce the initial exhaust temperature of 1235K (962°C) to 919K (646°C) at an ambient water temperature of 292K. To maintain the optimal operating temperature range of 550-650°C for the catalytic converter, a mathematical model was developed using MATLAB/Simulink, incorporating a thermostat and heater as temperature controllers. Additionally, a 2D model of the HOWO Sino-truck WD615.69, 336HP combustion chamber was designed to obtain real engine-out data on ANSYS. The emission reduction reactions was studied using the "psr_after treatment.ckprj" project file from the CHEMKIN sample library, with a focus on the surface reaction mechanism for catalytic conversions of NOx, CO, and unburnt hydrocarbons (UHCs) using a Platinum (Pt) three-way catalyst. The model demonstrated significant reductions in emissions, with CO decreased by 83.3%, NOx by 51%, and UHCs by 60.08%, while also contributing 67.6% of CO2 and 30.7% of O2 to the surrounding workshop environment. This research provides a comprehensive solution to address the environmental concerns associated with vehicle maintenance in auto repair workshops, contributing to improved air quality and reduced health risks for workers and local communities.The Growing Number Of Vehicles On The Road Has Led To A Parallel Expansion Of Auto Repair Workshops. However, The Environmental Impact Of Emissions From Vehicle Exhaust Systems During Maintenance Procedures Has Often Been Overlooked. According To The World Health Organization, Diesel Engine Is Major Contributor Of Six Primary Air Pollutants Comprise Particle Pollution, Ground-Level Ozone, Carbon Monoxide, Sulfur Oxides, Nitrogen Oxides, And Lead. Both Prolonged And Brief Exposure To Airborne Toxicants Yield Varying Toxicological Consequences For Humans, Encompassing Respiratory And Cardiovascular Ailments, Neuropsychiatric Complications, Eye Irritation, Skin Disorders, And Enduring Chronic Illnesses Like Cancer The Study Is A Second-Generation Pollution Reduction System Used For Workshop Of Heavy-Duty Vehicles The Primary Objective Is To Mitigate Air Pollution By Stabilizing The Temperature Of The Catalytic Converter. A Finite Element Model Was Employed To Evaluate The System's Performance. Given The High Temperatures Generated By Heavy-Duty Engines, Multiple Cooling Pipes Was Designed To Reduce The Initial Exhaust Temperature Of1235k (962??C) To 919k (646??C) At An Ambient Water Temperature Of 292k. To Maintain The Optimal Operating Temperature Range Of 550-650??C For The Catalytic Converter, A Mathematical Model Was Developed Using Mat lab/Simulink, Incorporating A Thermostat And Heater As Temperature Controllers. Additionally, A 2d Model Of The Howo Sino-TruckWd615.69, 336hp Combustion Chamber Was Designed To Obtain Real Engine-Out Data On Ansys. The Emission Reduction Reactions Was Studied Using The "Psr_After ?Treatment. Ckprj" Project File From The Chemkin Sample Library, With A Focus On The Surface Reaction Mechanism For Catalytic Conversions Of Nox, Co, And Unburnt Hydrocarbons (Uhcs) UsingA Platinum (Pt) Three-Way Catalyst. The Model Demonstrated Significant Reductions In Emissions, With Co Decreased By 83.3%, Nox By 51%, And Uhcs By 60.08%, While Also Contributing 67.6% Of Co2 And 30.7% Of O2 To The Surrounding Workshop Environment. This Research Provides A Comprehensive Solution To Address The Environmental Concerns Associated With Vehicle Maintenance In Auto Repair Workshops, Contributing To Improved Air Quality And Reduced Health Risks For Workers And Local Communities.