EXPERIMENTAL INVESTIGATIONS ON CONTROL OF EXHAUSTEMISSIONS OF A SEMI-ADIABATIC DIESEL ENGINE WITHPLASTIC OILAditya Seshu Machiraju, M.V.S. Murali Krishna and P. UshasreeAbstract This paper concentrates on alternative fuel technology for diesel engine and environmental protection. Theexhaust emissions from diesel engine cause severe health hazards when they are inhaled in.. They alsocause environmental disorders. Hence control of these emissions is an immediate step. Vegetable oils andalcohols are important substitutes for diesel fuel, as they are renewable in nature. Though vegetable oilshave comparable properties with diesel fuel, they have high viscosity and low volatility causing combustionproblems in diesel engines. Alcohols have high volatility but low Cetane number (a measure of combustionquality in diesel engine). Plastic oil derived from waste plastic by the process of pyrolysis has equitantcalorific value with diesel fuel. However, its viscosity is higher than diesel fuel calls for semi adiabaticdiesel engine (SADE). The concept of semi adiabatic diesel engine is to reduce heat flow to the coolant thereby providing hot combustion chamber used for burning high viscous fuels like plastic oil. Semi adiabaticengine consisted of air gap insulated piston with stainless steel crown and stainless steel gasket. The exhaustemissionsof particulate matter (PM), carbon monoxide (CO), nitrogen oxide levels (NOx) and Un-burnthydrocarbons (UBHC), with plastic oil were determined with conventional engine (CE) and SADE withvaried injection timing at full load operation of the engine. Injection timing was varied with an electronicsensor. PM was determined by AVL Smoke meter, while NOx, CO and UBHC were measured by NetelChromatograph multi gas analyzer at full load operation of the engine. Exhaust gas recirculation (EGR) atoptimum value of 10% flow rate was provided to control the emissions. The data were compared with neatdiesel operation on conventional engine with and without EGR. |