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Part-Load Performance of a Wet Indirectly Fired Gas Turbine Integrated with an Organic Rankine Cycle Turbogenerator

机译：与有机朗肯循环汽轮发电机组合的湿式间接燃气轮机的部分负荷性能

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Over the last years, much attention has been paid to the development of efficient and low-cost power systems for biomass-to-electricity conversion. This paper aims at investigating the design- and part-load performance of an innovative plant based on a wet indirectly fired gas turbine (WIFGT) fueled by woodchips and an organic Rankine cycle (ORC) turbogenerator. An exergy analysis is performed to identify the sources of inefficiencies, the optimal design variables, and the most suitable working fluid for the organic Rankine process. This step enables to parametrize the part-load model of the plant and to estimate its performance at different power outputs. The novel plant has a nominal power of 250 kW and a thermal efficiency of 43%. The major irreversibilities take place in the burner, recuperator, compressor and in the condenser. Toluene is the optimal working fluid for the organic Rankine engine. The part-load investigation indicates that the plant can operate at high efficiencies over a wide range of power outputs (50%–100%), with a peak thermal efficiency of 45% at around 80% load. While the ORC turbogenerator is responsible for the efficiency drop at low capacities, the off-design performance is governed by the efficiency characteristics of the compressor and turbine serving the gas turbine unit.
机译：在过去的几年中，已经非常关注用于生物质到电的转换的高效且低成本的电力系统的开发。本文旨在研究基于木屑燃料的湿式间接燃烧燃气轮机（WIFGT）和有机朗肯循环（ORC）涡轮发电机的创新工厂的设计和部分负荷性能。进行了火用分析以识别低效率的根源，最佳设计变量以及最适合有机朗肯工艺的工作流体。此步骤可以对工厂的部分负荷模型进行参数化，并估计其在不同功率输出下的性能。新工厂的额定功率为250 kW，热效率为43％。主要的不可逆性发生在燃烧器，换热器，压缩机和冷凝器中。甲苯是有机朗肯发动机的最佳工作流体。部分负荷研究表明，该工厂可以在各种功率输出（50％–100％）上以高效率运行，在80％左右的负荷下，峰值热效率为45％。尽管ORC涡轮发电机会导致低容量时的效率下降，但非设计性能是由为燃气轮机单元提供服务的压缩机和涡轮机的效率特性控制的。

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