Prof. Mohamed Said Attia Shehata :: Publications:

An experimental work is directed to study different methods of emissions control and utilization of exhaust waste heat for water desalination. Experimental set up is designed using air cooled single cylinder spark ignition engine with compression ratio 8 and rated power 3kW at 1500 rpm. CO and UHC are measured for different operating conditions but SOX and NOX did not measure. Exhaust gas temperature are measured at different four points through exhaust pipe length. Exhaust system is modified to inject air after exhaust valve to reduce CO and UHC emissions. Air injection reduces CO and UHC due to CO and UHC react with O2 to form CO2 and H2O. With air injection exhaust gas temperatures increases due to increase heat release with burning CO and UHC. Exhaust gas recirculation (EGR) is directed into inlet engine mainfold to reduce maximum flame temperature for reducing NOX emissions but CO and UHC increase. Humidification process is used to reduce CO; UHC; particular metters (PM); sulfur oxides (SOX) and nitric oxides (NOX) by dissolving its in water. Waste heat in exhaust gas is utilized for water desalination with the help of tubular heat exchanger. Desalination process utilized 27 to 45% of waste heat in exhaust gas and engine overall efficiency increases to be in rang of 40 to 60 %. Percentage of utilization waste heat decreases with increased engine speed up to 1800 rpm after that its increases with increased engine speed due to decrease brake power. Percentage of utilizing waste heat decreases with increased exhaust gas temperature up to 370oC after that its increases with increased exhaust gas temperature. The present work contributes in reducing emissions, increases overall thermal efficiency and decreases cost of water desalination.