Study on the application of engine performance check and combustion analysis practices to improve CII attained on existing vessels
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The IMO MEPC 80th session set a goal for net-zero emissions by 2050, with additional CII enhancement measures expected after 2027. While measures such as slow-down operation and energy-saving devices (ESD) are required to improve the CII of existing ships, reducing fuel consumption is a top priority. In this study, we analyzed the P-𝛳 diagram and rate of heat release information obtained through engine performance checks to validate the potential for CII improvement by reducing fuel consumption and improving the combustion efficiency of the engine without any external measures such as retrofitting. After measuring the main engine output of two merchant ships and adjusting the VIT, the CII rating of one ship was improved from D2 to D1 by increasing ⊿P by 6.2 bar and reducing fuel consumption by about 3.7%, and the CII rating of the other ship was improved from D3 to D2 by increasing ⊿P by 8.4 bar and reducing fuel consumption by approximately 4.6%. This confirms that the CII rating can be improved through engine performance checks and combustion analysis, and future research will be expanded to consider external factors.
Abstract
The IMO MEPC 80th session set a goal for net-zero emissions by 2050, with additional CII enhancement measures expected after 2027. While measures such as slow-down operation and energy-saving devices (ESD) are required to improve the CII of existing ships, reducing fuel consumption is a top priority. In this study, we analyzed the P-𝛳 diagram and rate of heat release information obtained through engine performance checks to validate the potential for CII improvement by reducing fuel consumption and improving the combustion efficiency of the engine without any external measures such as retrofitting. After measuring the main engine output of two merchant ships and adjusting the VIT, the CII rating of one ship was improved from D2 to D1 by increasing ⊿P by 6.2 bar and reducing fuel consumption by about 3.7%, and the CII rating of the other ship was improved from D3 to D2 by increasing ⊿P by 8.4 bar and reducing fuel consumption by approximately 4.6%. This confirms that the CII rating can be improved through engine performance checks and combustion analysis, and future research will be expanded to consider external factors.