Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships
Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships
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DOI：
10.1016/j.energy.2014.12.009
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发表时间：
2015-02
期刊：
影响因子：
9
通讯作者：
U. Larsen;L. Pierobon;F. Baldi;F. Haglind;Anders Ivarsson
中科院分区：
文献类型：
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作者：
U. Larsen;L. Pierobon;F. Baldi;F. Haglind;Anders Ivarsson
国际上对船舶燃油效率和NOx排放的规定促使人们研究符合这些规定的新的系统布局。在内燃机中，降低燃料消耗的措施通常会导致NOx排放增加，在船舶推进系统的设计中需要仔细考虑这种权衡机制。本研究探讨五种不同配置的二冲程柴油机为基础的机械系统的大型船舶和他们的影响，上述权衡。采用多目标遗传算法对低速二冲程柴油机、涡轮增压器和有机朗肯循环（ORC）的数值模型进行了设计工况和部分负荷工况下NOx和燃油消耗的优化计算。此外，发动机调整和废气再循环的影响进行了研究。结果表明，增加系统的复杂性可以导致更低的燃料消耗和氮氧化物。使用混合动力涡轮增压器和有机朗肯循环废热回收系统，实现了高达9%的油耗降低和6.5%的NOx降低。
The international regulations on fuel efficiency and NOxemissions of commercial ships motivate the investigation of new system layouts, which can comply with the regulations. In combustion engines, measures to reduce the fuel consumption often lead to increased NOxemissions and careful consideration of this trade-off mechanism is required in the design of marine propulsion systems. This study investigates five different configurations of two-stroke diesel-based machinery systems for large ships and their influence on the mentioned trade-off. Numerical models of a low-speed two-stroke diesel engine, turbochargers and an ORC (organic Rankine cycle), are used for the optimisation of the NOxand fuel consumption at design and part-load conditions, using a multi-objective genetic algorithm. Moreover, the effects of engine tuning and exhaust gas recirculation are investigated. The results suggest that increased system complexity can lead to lower fuel consumption and NOx. Fuel consumption reductions of up to 9% with a 6.5% NOxreduction were achieved using a hybrid turbocharger and organic Rankine cycle waste heat recovery system.