Running performance of working fluid pump for organic Rankine cycle system

doi:10.11949/j.issn.0438-1157.20170244

Abstract

Abstract:

To study the performance and selection of the working fluid pump in organic Rankine cycle (ORC) waste heat recovery system for vehicle engines, a test bench of a multistage centrifugal pump was constructed using R123 as working fluid in a condition of simulative ORC waste heat recovery system for vehicle engines. Experimental results of the multistage centrifugal pump under various operating conditions were obtained based on controlled working rotational speed (870-2900 r·min^-1) and working fluid flow rate (0.20-5.00 m³·h^-1). The interaction of the key pump parameters and their effect on the ORC performance were analyzed in this paper. In addition, the feasibility of the multistage centrifugal pump applied to the ORC waste heat recovery system for vehicle engines was verified and the optimal working point parameters were also determined. Results showed that the overall pump efficiency of multistage centrifugal pump was between 15.00% and 65.70%. The outlet pressure, pump efficiency and ORC thermal efficiency increased with the increase of the rotating speed of the pump. The flow rate needed to be regulated as the frequency became increasingly high. The maximum thermal efficiencies of the ORC system corresponding to various working frequencies of the pump were observed. Furthermore, the practical back work ratio (BWR) can reach up to 0.45 with the increase of the evaporating temperature of the ORC system. And the thermal efficiency can reach up to 10.50% when the rotating speed of multistage centrifugal pump was 2900 r·min^-1. Pumping power should not be neglected for small-scale ORC applications, and pump efficiency assumptions should be dependent on experiments. Low pump efficiency affected the increase of the thermal efficiency and net power of the ORC system.

Key words: organic Rankine cycle, thermodynamics, pump, recovery, various operating conditions, running performance

摘要：

为研究车用有机朗肯循环（organic Rankine cycle，ORC）余热回收系统中工质泵的性能及选型，在模拟车用ORC余热回收系统的工作环境下，设计并搭建了以R123作为工质的多级离心泵性能测试实验系统。通过控制多级离心泵转速（870~2900 r·min^-1）、调节工质流量（0.20~5.00 m³·h^-1），得到了多级离心泵特性曲线。通过分析变工况时多级离心泵关键参数间相互作用关系，及其对车用ORC余热回收系统性能的影响情况，验证了多级离心泵应用于车用ORC余热回收系统的可行性，并确定了其最佳工况点参数。研究结果表明：变工况时，多级离心泵总效率为15.00%~65.70%。车用ORC余热回收系统的蒸发压力、热效率均随着多级离心泵转速的增加而增加。在高转速区，工质流量对系统蒸发压力和多级离心泵输入功率（多级离心泵消耗的电功率）的影响明显增大。随着系统蒸发温度的升高，工质泵实际输入功率占膨胀机输出功率的比例（back work ratio，BWR）最高可达0.45。当多级离心泵转速为2900 r·min^-1时，车用ORC余热回收系统热效率最高可达10.50%。

关键词: 有机朗肯循环, 热力学, 泵, 回收, 变工况, 运行性能

CLC Number:

TK11⁺5

ZHANG Hongguang, YANG Yuxin, MENG Fanxiao, ZHAO Rui, TIAN Yaming, LIU Yi. Running performance of working fluid pump for organic Rankine cycle system[J]. CIESC Journal, 2017, 68(9): 3573-3579.

张红光, 杨宇鑫, 孟凡骁, 赵蕊, 田亚明, 刘毅. 有机朗肯循环系统中工质泵的运行性能[J]. 化工学报, 2017, 68(9): 3573-3579.

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