New Development of Piston Crown for Dual Fuel Diesel Engine to Improve Efficiency and Reduce NOx Emissions: a Review

The Application of Emergency Safety Device for The Improvement of Marine Operation of a Gas-Powered Ship

“…Dual-fuel system has been widely developed in marine areas whether as established factory product or modification from conventional one [15]. Fuel gas in the form of LNG or CNG cannot be ignited directly in diesel cycle combustion process [12]. There are two methods in burning gas inside diesel engine.…”

“…To achieve similar power output, in this research the gas quantity has been increased in proportional ways by improving the volume of the combustion chamber. The works cause higher compression ratio when the volume of the piston bowl is increased [12]. Those modification may cause potential damages in the in-cylinder combustion chamber when the higher power is resulted [4] that may cause higher combustion energy.…”

“…So far, the established system has already run well. But, due to the improvement of the combustion efficiency by modify the piston geometry to get higher power and lower emission [12], then the experiment work may cause some risks to several possible damages. For example, caused by higher engine compression ratio, thinner piston crown geometry, overheating and overpressure, etc.…”

“…Moreover, integrating the onboard automation system may contributes better performance of ship operation and its system [9]. This paper is implements of a new module called as Emergency Safety Device (ESD) to support research in modify the use of gas as fuel [12]. Gas facing of potential risks related to the safety of the engines, furthermore, when bigger power is expected from the modified engine [15].…”

“…ESD module expected can detect any initial danger and capable of react automatically to shut down the engine operation. The main objectives of this research [12] in investigating the maximum capability of the piston material should be accommodated without any risk for potential hazard then the potential growing of combustion power and heat always in safe conditions. It is a challenge in optimizing the control accuracy of the EDS without any risk of danger.…”