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Optimization of organic Rankine cycle power systems considering multistage axial turbine design

机译:考虑多级轴向汽轮机设计的有机朗肯循环动力系统的优化

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摘要

Organic Rankine cycle power systems represent a viable and efficient solution for the exploitation of medium-to-low temperature heat sources. Despite the large number of commissioned units, there is limited literature on the design and optimization of organic Rankine cycle power systems considering multistage turbine design. This work presents a preliminary design methodology and working fluid selection for organic Rankine cycle units featuring multistage axial turbines. The method is then applied to the case of waste heat recovery from a large marine diesel engine. A multistage axial turbine model is presented and validated with the best available data from literature. The methodology allows the identification of the most suitable working fluid considering the trade-off between cycle and multistage turbine designs. The results of the optimization of cycle and turbine suggest that the fluid n-butane yields the best compromise in terms of cycle net power output, turbine cost and efficiency for the considered case study. When a conservative design approach is adopted, the turbine features a two-stage configuration with supersonic converging nozzles and post-expansion. Conversely, a single-stage turbine featuring a supersonic converging-diverging nozzle and Mach number up to 2 is the resulting ideal choice when a more advanced design approach is implemented.
机译:有机朗肯循环动力系统代表了用于利用中低温热源的可行和有效的解决方案。尽管委托单位数量大,但考虑多级汽轮机设计的有机朗肯循环动力系统的设计和优化存在有限的文献。这项工作介绍了具有多级轴向涡轮机的有机朗肯循环单元的初步设计方法和工作流体选择。然后将该方法应用于来自大型船用柴油发动机的废热回收的情况。提出了一种多级轴向涡轮机模型,并验证了来自文献的最佳可用数据。方法论允许识别考虑循环和多级涡轮机设计之间的权衡的最合适的工作流体。循环和涡轮机的优化结果表明,在循环净功率输出,涡轮机成本和所考虑的案例研究的效率方面产生最佳妥协。当采用保守设计方法时,涡轮机采用具有超声波会聚喷嘴和后扩展的两级配置。相反,单级涡轮机以超音速会聚分歧喷嘴和最多2的马赫数为特色,是在实现更先进的设计方法时产生的理想选择。

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