现有船能效指数和营运碳强度指标对船舶的影响

Impact of EEXI and Operational CII on Ships

结合现有船能效指数(EEXI)规范实施的具体情况,建立简化模型,对限制主机功率和增加节能装置提高航速的两种方法开展对EEXI改善的贡献力度对比分析;以某型LNG船为研究对象,建立理论营运模式对LNG船燃油和燃气两种运行模式下碳强度指标(CII)进行对比,计算结果表明,对于现有船,采用限制主机功率与增加节能装置相结合的方法可有效改善EEXI指数和CII指数评级,对于现有LNG船,可选择燃气模式运行改善CII评级。

Combined with the specific situation of the implementation of the energy efficiency existing ship index(EEXI)specification,a simplified model was established to compare and analyze the contribution of the two methods of limiting the main engine power and increasing the energy saving device to improve the speed of the ship.The theoretical operation mode was applied to compare the carbon intensity index(CII)of a LNG ship under the two operation modes of fuel oil and gas.The calculation results showed that for existing ships,the combination of limiting the main engine power and adding energy-saving devices can effectively improve the rating of EEXI and CII index;for existing LNG vessels,alternative gas mode operation is helpful to improve CII rating.