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Optimization of the propulsion plant of a Liquefied Natural Gas transport ship

机译：液化天然气运输船舶推进厂的优化

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Stricter emission regulations and variability of fuel prices pose the focus on the optimization of steam turbine based propulsion plants of Liquefied Natural Gas (LNG) ships. The efficiency of such a propulsion plant has been improved in this work by studying the introduction of reheating and preheating stages in the onboard regenerative Rankine cycle. A thermodynamic model of the propulsion plant has been developed from the facility diagrams, being validated afterwards with available experimental data from actual ship operation. The predictions of different scenarios obtained by the model when introducing modifications in the power propulsion cycle showed promising results. It was found that a combination of preheating and reheating stages was found to increase the cycle efficiency up to 33.71%, reducing fuel consumption in around 20 t/day and CO2 emissions in more than 20,000 t per year. An exergy analysis of the impact of cycle modifications and an economic assessment of the proposed investment plan were performed. It was found that the boiler was the main contributor to exergy destruction, fact that justifies the cycle modifications performed. The economic analysis of the investment plan of implementing the selected alternative provided benefits even in a conservative scenario, with an Internal Rate of Return higher than 12% and a Pay-Back Period less than 9 years for all the studied scenarios. In summary, a practical industrial application of thermodynamic and exergy analysis to the propulsion plant of a LNG ship has been shown, allowing an efficiency, economic and environmental improvement.
机译：更严格的排放法规和燃料价格的可变性构成了液化天然气（LNG）船舶汽轮机推进植物的优化。通过研究在船上再生Quanine循环中引入再加热和预热阶段，在这项工作中提高了这种推进装置的效率。从设施图中开发了推进设备的热力学模型，之后验证了来自实际船舶操作的可用实验数据。当在电力推进循环中引入修改时，通过模型获得的不同场景的预测显示了有希望的结果。发现预热和再加热阶段的组合将增加循环效率高达33.71％，降低约20吨/天的燃料消耗，每年超过20,000吨的二氧化碳排放量。对循环修改的影响和拟议的投资计划的经济评估进行了彻底分析。有人发现，锅炉是彻底破坏的主要因素，实际上证明了所执行的循环修改。即使在保守方案中，实施所选替代方案的投资计划的经济分析也为福利提供了高于12％的内部回报率，并为所有学习情景不到9年的偿还期。总之，已经显示了对LNG船舶推进厂的热力学和漏洞分析的实际工业应用，允许效率，经济和环境改善。

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