• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (22): 190-197.doi: 10.3901/JME.2017.22.190

• 可再生能源与工程热物理 • 上一篇    下一篇

有机朗肯循环系统动态响应分析

倪佳鑫, 张莹, 邓帅, 赵力   

  1. 天津大学中低温热能高效利用教育部重点实验室 天津 300072
  • 收稿日期:2016-09-02 修回日期:2017-05-09 出版日期:2017-11-20 发布日期:2017-11-20
  • 通讯作者: 赵力(通信作者),男,1972年出生,博士,教授,博士研究生导师。主要研究方向为太阳能高效利用。E-mail:jons@tju.edu.cn
  • 作者简介:倪佳鑫,男,1993年出生。主要研究方向为朗肯循环动态仿真。E-mail:danileo250@163.com
  • 基金资助:
    天津市科技支撑计划资助项目(15ZCZDGX01030)。

Dynamic Simulation of an Organic Rankine Cycle System

NI Jiaxin, ZHANG Ying, DENG Shuai, ZHAO Li   

  1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education, Tianjin University, Tianjin 300072
  • Received:2016-09-02 Revised:2017-05-09 Online:2017-11-20 Published:2017-11-20

摘要: 现有的有机朗肯循环动态仿真,多是以分布参数法或移动边界法构建换热器的动态模型,以致仿真速度较慢。基于此,提出一种新方法,构建换热器的动态模型,此模型利用四个参数表征换热器特性,减少了动态方程的数目,提高了求解速度,广泛适合于工程计算中的不同类型换热器。利用此模型比较了不同换热能力和不同储液体积的换热器的动态响应情况以模拟比较不同类型换热器的动态性能,模拟结果显示换热能力越好,内部储液体积越少的换热器,出口响应越快。并且在Matlab/Simulink平台上搭建了ORC系统的动态模型,模拟了在入口热源温度波动下的ORC系统运行状况,并与试验数据进行了验证,在保证较快的计算能力的同时,达到满意的计算精度,模拟结果与试验误差达到5.8%。最后讨论了调节流量对于抵消出口热源温度波动的作用,发现尽快调节流量可稳定出口焓值,抵消热源温度变化所导致的波动,但在一定时间之后再调节则对稳定出口焓值的意义不大。为提出控制手段提供参考。

关键词: 动态仿真, 换热器, 响应时间, 有机朗肯循环

Abstract: The existing dynamic model of the organic Rankine cycle(ORC) system is based on the distributed parameter model or the moving boundary model of heat exchanger, which results in a low calculation speed. A new method has been proposed to analyse the dynamic model of heat exchanger. The model is described by four parameters, reducing the number of the equations to improve the calculation speed. Then on this basis, the model is used to study the dynamic performances of various heat exchangers with different heat transfer capacity as well as different volumes within the exchanger. It indicates that the dynamic of the one with the better heat transfer capacity and the less volume is faster. What's more, a dynamic model of ORC has been established with the new model of heat exchanger on the platform software Matlab/Simulink, and validated by the experiment data. The two results coincide well with each other. At last, enthalpy fluctuation at the evaporator outlet caused by the inlet temperature of heat source has been discussed. It reveals that it's effective to stabilize the enthalpy with an earlier control, while it's less meaningful to take a control after a certain amount of time. The results can provide reference for the control strategy.

Key words: dynamic simulation, heat exchanger, organic Rankine cycle, response time

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