Abstract
Exhaust Gas Recirculation (EGR) is technology to reduce NO X emission of diesel engine. This technology could circulate some exhaust gas into the combustion chamber. The adiabatic combustion temperature could decrease and reduce the reaction of oxygen in nitrogen. This method could inhibit the formation of NO X during the combustion process because NO X formation reactions occur at high temperatures. EGR has some effects such as decreased engine performance, SFOC increases and changes in the combustion process. In order to suppress the negative impact, the research carried out by replacing the EGR valve using a type angle globe valve. Experiments conducted using a single cylinder diesel engine YANMAR type TF85-MHDI. The result obtained in this study is the emission of NO X can be reduced up to 15.6 g/kWh or 44.2% of the engine condition without EGR. The experimental results indicate that the use of angle globe EGR valve can reduce the SFOC up to 35.29 gr/kWh. Results of power, torque and BMEP also better compared EGR standard. While in the combustion process showed that the use of EGR valve angle globe causing peak of combustion pressure becomes lower and the Rate of Heat Release (ROHR) is lowered.
Highlights
Most of the marine transportation mode selected is the ship with the engine in the form of a diesel engine
From these results explain that the use of Exhaust Gas Recirculation (EGR) and the choice of EGR valve different in at 100% rpm and 50% load can lead to early heat release is increasingly moving towards the right of degrees of crankshaft rotations on the condition of 10% Angle Globe EGR Valve (AGV), 10% Ball-type EGR Valve (BV) and 20% AGV but use 20% BV Rate of Heat Release (ROHR) early shows are to the left of the condition of 0% EGR
Based on experiments conducted at the hot and cold EGR system mounted on a diesel engine with that I as the author draw the following conclusion: 1. The result of SFOC with 10% EGR using angle globe EGR valve could be decrease until 35,29 gr/kWh or lower by 10.3% compared to a diesel engine without EGR system
Summary
Most of the marine transportation mode selected is the ship with the engine in the form of a diesel engine. In this case the selected valve types Angle Globe Valve as an EGR valve with a special design in order to obtain the value of minor head loss is small. To understand the influence of the EGR valve angle type globe valve, it is necessary to conduct experiment of diesel engine in order to know the performance of the engine, the combustion process and levels of NOX. To analysis the performance of the engine needs to be done in order to measure the extent of achievement of power, torque and fuel efficiency of diesel engine produced after modifed its EGR with angle globe valve types. Valve is designed to be easy to maintain the inside of the valve against the crusts of carbon that settles the burn
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