包装废弃物热解余热回收用涡旋膨胀机瞬态流动特性研究  

Transient Flow Characteristics of Scroll Expander for Waste Heat Recovery from Packaging Waste Pyrolysis

作　　者：王婧[1] 郭立强[1] 武立强 田硕 WANG Jing;GUO Li-qiang;WU Li-qiang;TIAN Shuo(Baoding Cigarette Factory of Hebei Baisha Tobacco Co.,Ltd.,Hebei Baoding 071000,China)

机构地区：[1]河北白沙烟草有限责任公司保定卷烟厂,河北保定071000

出　　处：《包装工程》2023年第15期244-251,共8页Packaging Engineering

基　　金：河北中烟工业有限责任公司科技项目(HBZY2022B001\HBZY2022A012)。

摘　　要：目的为揭示进气压力的变化对涡旋膨胀机内部流动特征及性能参数的影响机制,探究其对膨胀机效率及实际回收功率的影响规律。方法以余热回收有机朗肯循环中的涡旋膨胀机为研究对象,利用STAR CCM+软件,采用重叠网格技术对涡旋膨胀机内部计算流体域进行非稳态离散求解,分析涡旋膨胀机流场变化特性以及性能参数的变化规律。结果在出口压力不变的条件下,随着进气压力的上升,压力场分布梯度增大;进、出口流量均呈现周期性波动,出口流量的波动幅度明显小于入口流量的波动幅度。填充系数的大小一定程度上反映了膨胀机内部的泄漏程度或流动阻力大小,观察到进气压力为0.75 MPa时填充系数最大,此时工质的流动阻碍相对更小,平均质量流量也最大。涡旋膨胀机等熵效率、输出功率均随进气压力的增大而增大。结论涡旋膨胀机输出功率的优化与多种因素相关,要综合考虑进出口实际焓差和平均质量流量等因素的影响,只考虑单方面因素缺乏一定的合理性。The work aims to explore the effect law of inlet pressure change on the efficiency and actual recovery power of scroll expander to reveal the effect mechanism of inlet pressure change on internal flow characteristics and per-formance parameters of scroll expander.With the scroll expander in the organic Rankine cycle of waste heat recovery as the research object,STAR CCM+software and overlapping grid technology were adopted to conduct the unsteady discrete solution on the internal computational fluid domain of the scroll expander,and the flow field change characteristics and the change law of performance parameters of the scroll expander were analyzed.When the outlet pressure was constant,the gradient of pressure distribution increased with the increase of inlet pressure.The flow at the inlet and outlet fluc-tuated periodically,and the fluctuation range of the flow at the outlet was obviously smaller than that at the inlet.The filling coefficient reflected the degree of leakage or flow resistance inside the expander to some extent.It was observed that the filling coefficient was the largest when the inlet pressure was 0.75 MPa,at which time the flow resistance of the working medium was relatively smaller and the average mass flow was also the largest.The isentropic efficiency and output power of the scroll expander increased with the increase of inlet pressure.The optimization of the output power of the scroll expander is related to a variety of factors.It is necessary to comprehensively consider the effect of the actual enthalpy difference between the inlet and outlet and the average mass flow rate,and it is not reasonable to consider only unilateral factors.

关 键 词：包装废弃物 余热回收 涡旋膨胀机 流动特性 数值模拟 

分 类 号：TK14[动力工程及工程热物理—热能工程]