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Design and performance experiment of radial inflow turbine expander for organic Rankine cycle system
International Journal of Low-Carbon Technologies ( IF 2.3 ) Pub Date : 2021-05-24 , DOI: 10.1093/ijlct/ctab043
Yanan Gou 1 , Lei Li 1, 2 , Hong Min 1
Affiliation  

Abstract
Expander is the core component of organic Rankine cycle (ORC) system. Taking R245fa as the organic working fluid, the miniaturization design of radial inflow turbine expander with theoretical maximum output power 20 kW and rotational speed of 30 000 r/min is carried out. The deflector and the moving impeller are simulated and designed. The ORC system with preheater and superheater is built for performance analysis of the designed turbine expander. The effects of temperature, pressure and rotational speed on the output power, temperature drop and efficiency of turbine expander are studied experimentally. The experimental results show that with the increase of the inlet temperature, the efficiency of the turbine expander has a minimum value, but the output power keeps increasing gradually. The analysis shows that the lowest efficiency is caused by the deterioration of expansion due to the rapid increase of flow rate. The turbine expander has the maximum efficiency of 0.886 at the inlet temperature 393.15 K and the inlet pressure 1.2 MPa. When the rotational speed increases from 12 000 r/min to 28 000 r/min, the temperature drop increases from 17.2 K to 32.7 K, and the output power increases from 7.04 kW to 17.3 kW. With the increase of rotational speed, the thermal power conversion capacity and temperature drop increase, so the output power increases. The system efficiency increases with the increase of turbine expander efficiency and has the same change rule.


中文翻译:

有机朗肯循环系统径向流入涡轮膨胀机设计与性能试验

摘要
膨胀剂是有机朗肯循环(ORC)系统的核心组成部分。以R245fa为有机工质,对理论最大输出功率20 kW、转速30 000 r/min的径流式涡轮膨胀机进行了小型化设计。对导流板和动叶轮进行了仿真设计。带有预热器和过热器的 ORC 系统是为设计的涡轮膨胀机的性能分析而构建的。实验研究了温度、压力和转速对透平膨胀机输出功率、温降和效率的影响。实验结果表明,随着进气温度的升高,涡轮膨胀机的效率有一个最小值,但输出功率却逐渐增加。分析表明,效率最低是由于流量快速增加导致膨胀恶化造成的。涡轮膨胀机在入口温度 393.15 K 和入口压力 1.2 MPa 时的最大效率为 0.886。当转速从 12 000 r/min 增加到 28 000 r/min 时,温降从 17.2 K 增加到 32.7 K,输出功率从 7.04 kW 增加到 17.3 kW。随着转速的增加,热电转换能力和温降增加,因此输出功率增加。系统效率随着透平膨胀机效率的提高而提高,变化规律相同。15 K 和入口压力 1.2 MPa。当转速从 12 000 r/min 增加到 28 000 r/min 时,温降从 17.2 K 增加到 32.7 K,输出功率从 7.04 kW 增加到 17.3 kW。随着转速的增加,热电转换能力和温降增加,因此输出功率增加。系统效率随着透平膨胀机效率的提高而提高,变化规律相同。15 K 和入口压力 1.2 MPa。当转速从 12 000 r/min 增加到 28 000 r/min 时,温降从 17.2 K 增加到 32.7 K,输出功率从 7.04 kW 增加到 17.3 kW。随着转速的增加,热电转换能力和温降增加,因此输出功率增加。系统效率随着透平膨胀机效率的提高而提高,变化规律相同。
更新日期:2021-05-24
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