The impact of fuel type on carbon intensity indicator (CII) of marine ships

Abstract

Two new energy efficiency indicators of different types of marine fuel are proposed: the coefficient of carbon intensity of the fuel CEF_CO2 and the relative coefficient of carbon intensity of the fuel KOET. A method is proposed for assessing the effect of the fuel used on the ship on the operational carbon intensity index of the CII vessel using the proposed carbon energy intensity coefficients. According to the methodology for assessing changes in CII when transferring ships from heavy fuel to diesel (motor) fuel, it provides an improvement in the energy efficiency of the CII vessel by approximately 5 — 7 %. The results of the assessment were compared with data on the operation of Atlantic-333 type ships using two types of fuel, which showed a good match.
The data on the change in fuel and oil consumption when using heavy fuel compared to distillate fuel after the conversion of the main engines of the 6M20 type of the company MAK to heavy fuel on ships of the Atlantic-333 type are presented. Based on these data, an assessment of heavy fuel losses associated with leaks and fuel preparation costs for marine consumers is carried out. It also provides data on changes in the life of various engine parts and an increase in maintenance work on the ship.
In connection with the introduction of the MARPOL Convention ban on the use of heavy fuel in polar waters and the introduction of energy efficiency requirements, it is concluded that there is a trend towards wider use of distillate diesel fuel on ships flying the Russian flag.