Diesel engine is generally used to produce the power on the ground and the sea, however, the combustion characteristics are changed on account of the wear of fuel system and the alternated situation of combustion chamber neighborhood by increasing the engine operating time. It is proved that diesel ...
Diesel engine is generally used to produce the power on the ground and the sea, however, the combustion characteristics are changed on account of the wear of fuel system and the alternated situation of combustion chamber neighborhood by increasing the engine operating time. It is proved that diesel engine is a desirable power source because it has a higher thermal efficiency, durability and reliability than the other type of engines. Diesel engine is also easy to get high power with the cheap fuel and less emission quantity of CO2. In future, it is pushfully necessary to execute measure which reduces the specific fuel consumption and air pollution substance. The key factors influencing the combustion and emission characteristic include fuel injection timing, rate of injection, atomization of fuel spray and penetration. These factors have organic relations. If the operation period is long, the fuel injection timing is late because there are all of component abrasion influencing fuel injection system. Therefore it is necessary to rearrange the fuel injection timing after execuating a constant operation period. So, this study experimentally investigates the effect of fuel injection timing on combustion and emission characteristics. Studies on engine are generally carried out through the experimental engine, which is installed in laboratory, and a new engine because of the abrasion phenomenon of all components. In this study, the generator of training ship M/S "HAE RIM" of Kunsan National University which is being shipped during 20 years was used for the experiment. It is judged that optimum fuel injection timing can help an economical sailing for old ships. In respect of diesel engine, after setting the number of revolution of 1200 rpm in engine, the interval of load is 30kW from 0kW to 90kW and the interval of injection timing is 2°CA from BTDC 19°CA to 23°CA to analyze the effect of fuel injection timing on pressure of a combustion chamber, specific fuel consumption, nitrogen oxide, carbon monoxide and SO2 and exhaust gas temperature, etc. It is proved that the optimum fuel injection timing is BTDC 23°CA which is 2°CA faster than that of original injection timing. The details are as follows. 1. The more load is increased, the more specific fuel consumption is reduced. Also, the more fuel injection timing is advanced, the more specific fuel consumption is reduced, and the minimum is at BTDC 23°CA. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, specific fuel consumption is decreased by 0.98%. 2. The more load is increased, the more emission of CO is convexly decreased. Even though fuel injection timing is advanced, the same trend appears. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, emission of CO is increased by 1.14%. 3. The more load is increased, the more emission of NOx is increased in a straight line. The more fuel injection timing is advanced, the more emission of NOx is produced. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, emission of NOx is increased by 1.12%. 4. The more load is increased, the more emission of soot is convexly decreased, Even though fuel injection timing is advanced, the same trend appears. At the load of 90 kW/1200 rpm, if fuel injection timing is lated from BTDC 21°CA to BTDC 23°CA, emission of soot is decreased by 0.5%. 5. The more load is increased, emission of SO2 is increased in a straight line. The more fuel injection timing is advanced, the more emission of SO2 is reduced. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, emission of SO2 is decreased by 0.97%.
Diesel engine is generally used to produce the power on the ground and the sea, however, the combustion characteristics are changed on account of the wear of fuel system and the alternated situation of combustion chamber neighborhood by increasing the engine operating time. It is proved that diesel engine is a desirable power source because it has a higher thermal efficiency, durability and reliability than the other type of engines. Diesel engine is also easy to get high power with the cheap fuel and less emission quantity of CO2. In future, it is pushfully necessary to execute measure which reduces the specific fuel consumption and air pollution substance. The key factors influencing the combustion and emission characteristic include fuel injection timing, rate of injection, atomization of fuel spray and penetration. These factors have organic relations. If the operation period is long, the fuel injection timing is late because there are all of component abrasion influencing fuel injection system. Therefore it is necessary to rearrange the fuel injection timing after execuating a constant operation period. So, this study experimentally investigates the effect of fuel injection timing on combustion and emission characteristics. Studies on engine are generally carried out through the experimental engine, which is installed in laboratory, and a new engine because of the abrasion phenomenon of all components. In this study, the generator of training ship M/S "HAE RIM" of Kunsan National University which is being shipped during 20 years was used for the experiment. It is judged that optimum fuel injection timing can help an economical sailing for old ships. In respect of diesel engine, after setting the number of revolution of 1200 rpm in engine, the interval of load is 30kW from 0kW to 90kW and the interval of injection timing is 2°CA from BTDC 19°CA to 23°CA to analyze the effect of fuel injection timing on pressure of a combustion chamber, specific fuel consumption, nitrogen oxide, carbon monoxide and SO2 and exhaust gas temperature, etc. It is proved that the optimum fuel injection timing is BTDC 23°CA which is 2°CA faster than that of original injection timing. The details are as follows. 1. The more load is increased, the more specific fuel consumption is reduced. Also, the more fuel injection timing is advanced, the more specific fuel consumption is reduced, and the minimum is at BTDC 23°CA. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, specific fuel consumption is decreased by 0.98%. 2. The more load is increased, the more emission of CO is convexly decreased. Even though fuel injection timing is advanced, the same trend appears. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, emission of CO is increased by 1.14%. 3. The more load is increased, the more emission of NOx is increased in a straight line. The more fuel injection timing is advanced, the more emission of NOx is produced. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, emission of NOx is increased by 1.12%. 4. The more load is increased, the more emission of soot is convexly decreased, Even though fuel injection timing is advanced, the same trend appears. At the load of 90 kW/1200 rpm, if fuel injection timing is lated from BTDC 21°CA to BTDC 23°CA, emission of soot is decreased by 0.5%. 5. The more load is increased, emission of SO2 is increased in a straight line. The more fuel injection timing is advanced, the more emission of SO2 is reduced. If the injection timing is advanced from BTDC 21°CA to BTDC 23°CA, emission of SO2 is decreased by 0.97%.
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