To reduce greenhouse gases in industrial fields, IMO(International Maritime Organization) has implemented regulations to actively reduce CO2 emissions from shipping through regulations such as EEDI, EEOI(Energy Efficiency Operational Indicator), CII(Carbon intensity Indicator), etc. In this paper, EEDI of 2 target vessels are calculated with the information on the type and size of those ships, along with the engine types and power. In addition, the results of applying technical measures to satisfy the IMO regulations are also discussed. The obtained results suggested the fuel change from MDO to LNG is the most effective way to reduce EEDI considering the current situations of the limited supply of alternative fuels. Decreasing ship speed was the next effective option to meet the regulation until phase 4. However, for both vessels, an additional measure is required to meet Phase 5, demanding a reduction of 70%. The Onboard CCS system for KCS and KVLCC2 was designed to meet the phase 5 from the process simulation.
Various serious problems caused by global warming are occurring around the world, and eco-friendly decarbonization regulations have recently been conducted to solve this issue. In the shipping field, the IMO(International Maritime Organization), which oversees maritime affairs around the world, has implemented related regulations. As one of the efforts, newly constructed ships must meet the standards of EEDI(Energy Efficiency Design Index) regulation as of 2013, indicating the amount of carbon dioxide emission to transport a ton of cargo for one nautical mile. To satisfy this, newly built ships after 2013 need to be designed energy-efficiently from the first stage(MEPC.203(62), IMO, 2011), and research on linear and propulsion system improvement is being actively conducted because the amount to be reduced step by step increases.
To improve the index, several methods have been proposed. One is converting to a propulsion system using LNG(Liquefied Natural Gas), not low sulfur fuel oil or existing bunker oil, and another is on-board CCS(Carbon Capture and Storage), collecting CO2 emitted from ships by installing associated facilities. At the same time, there are also other methods which are the reduction of a ship's waterside resistance by modifying the head side of a ship or the attachment of an ESD(Energy Saving Device) on the propeller to increase propulsion efficiency. It is known that attaching an ESD has an effect of a 5% increase on average in transmission power.
