Evaluation of Exhaust Emissions of a Semi-Adiabatic Diesel Engine with Plastic Oil


Exhaust emissions from internal combustion engines, particularly diesel engines, are substantial contributors to global air pollution. When breathed, these emissions induce health problems such as TB, asthma, severe headaches, vomiting, dizziness, haemoglobin loss, and so on. They also contribute to major environmental problems such as the Greenhouse effect, acid rain, and global warming. As a result, it is critical to keep these emissions under control at all times. The quest for alternative fuels is vital and unavoidable in the context of rapid depletion of fossil resources, rising pollution levels from fossil fuels, and increasing economic strain on emerging nations like India. Despite having qualities similar to diesel fuel, vegetable oils have a high viscosity and low volatility, causing combustion issues in diesel engines. Alcoholic beverages have Low Cetane number yet significant volatility (a measure of combustion quality in diesel engine). Plastic oil obtained by pyrolysis from waste plastic has a calorific value comparable to diesel fuel. Its viscosity, however, is greater than diesel fuel, necessitating the use of a semi-adiabatic diesel engine. The idea behind a semi-adiabatic diesel engine is to limit heat flow to the coolant while yet providing a hot combustion chamber for high viscosity fuels like plastic oil. Air gap insulated piston with stainless steel crown and stainless steel gasket were used in the semi-adiabatic engine. The exhaust emissions of a Semi-Adiabatic Diesel Engine running on Plastic Oil were measured at various injection timing and pressure settings. The electronic sensor was used to change the injection time. The Injection Pressure was varied in three stages of 40 bar, starting at 190 bar and ending at 270 bar, using a Nozzle Testing Apparatus. At a pressure of 0.8 bar, supercharging was used. To find the Optimal Injection Timing of the SADE, the Break Thermal Efficiency (BTE) was examined at various Injection Timings and Injection Pressures. The Optimum Injection Timing (OIT) of SADE using Plastic Oil as fuel was found as the time when Peak BTE was attained. Particulate Matter (PM), Carbon Monoxide (CO), Nitrous Oxides (NOX), and Unburned Hydrocarbons (UBHC) levels in a SADE using Plastic Oil, with and without Supercharging, at various injection pressures and timings.

Author(S) Details

Aditya Seshu Machiraju
Department of Mechanical Engineering, Osmania University, India.

M. V. S. Murali Krishna
Department of Mechanical Engineering, Chaitanya Bharathi Institute of Technology, India.

P. Ushasri
Department of Mechanical Engineering, University College of Engineering, Osmania University, India.

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