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《山东大学学报(理学版)》 ›› 2024, Vol. 59 ›› Issue (11): 74-84.doi: 10.6040/j.issn.1671-9352.0.2024.263

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PCM-PCHE对SCO2布雷顿循环在变工况下的影响

张廉洁1(),李威2,杨萍1,曾敏1,*(),王秋旺1   

  1. 1. 西安交通大学能源与动力工程学院，陕西 西安 710049
    2. 南京工业大学机械与动力工程学院，江苏 南京 211816
  • 收稿日期:2024-07-27 出版日期:2024-11-20 发布日期:2024-11-29
  • 通讯作者: 曾敏 E-mail:zlj19951231@stu.xjtu.edu.cn;zengmin@mail.xjtu.edu.cn
  • 作者简介:张廉洁(1995—)，男，博士研究生，研究方向为布雷顿循环、相变材料、智能控制. E-mail: zlj19951231@stu.xjtu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(52176085);国家重点研发计划项目(2023YFE0204800);江苏省自然科学基金项目(BK20230319)

Effect of PCM-PCHE on SCO2 Brayton cycle under variable operating conditions

Lianjie ZHANG1(),Wei LI2,Ping YANG1,Min ZENG1,*(),Qiuwang WANG1   

  1. 1. School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
    2. College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 211816, Jiangsu, China
  • Received:2024-07-27 Online:2024-11-20 Published:2024-11-29
  • Contact: Min ZENG E-mail:zlj19951231@stu.xjtu.edu.cn;zengmin@mail.xjtu.edu.cn

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摘要：

为了削弱超临界二氧化碳(supercritical carbon dioxide，SCO2)布雷顿循环系统的温度不稳定等变工况对循环系统的影响，本研究将内嵌相变材料的印刷电路板换热器(phase change materials-printed circuit heat exchanger，PCM-PCHE)在数值模拟计算中的结果进行拟合与归纳，建立PCM-PCHE与SCO2布雷顿循环的耦合动态仿真模型，并通过其在稳定条件下的参数与实验值的对比完成了模型验证。然后观测SCO2布雷顿循环系统核心参数在温度波动以及负载变动时的变工况特性。结果表明，添加PCM-PCHE对工作条件可变的SCO2布雷顿循环系统具有更好的稳定效果，使得循环效率的波动幅值降低了40.8%，有PCM的工况转子速度稳定值比无PCM工况低18 r/min，同时减小了透平机械的等熵效率在负载变化时的变动幅度，有利于系统的稳定。

关键词: 换热器, 相变材料, 布雷顿循环, 温度波动, 负载变化, 动态特性

Abstract:

In order to weaken the influence of variable operating conditions such as temperature instability on the supercritical carbon dioxide (SCO2) Brayton cycle, this study fitted and generalized the results of the phase change materials-printed circuit heat exchanger (PCM-PCHE) embedded in numerical simulations, and established a dynamic simulation model of the coupling between PCM-PCHE and SCO2 Brayton cycle. The coupled dynamic simulation model of SCO2 Brayton cycle was established, and the model validation was completed by the comparison of its parameters with experimental values under stable conditions. Then the variable operating conditions characteristics of the core parameters of the SCO2 Brayton cycle system were observed under temperature fluctuations as well as load variations. The results showed that the addition of PCM-PCHE has a better stabilizing effect on the SCO2 Brayton cycle system with variable operating conditions, which reduced the fluctuation amplitude of the cycle efficiency by 40.8%, and the stabilized value of the rotor speed was lower than that without PCM by 18 r/min, and at the same time, it weakened the variation amplitude of the isentropic efficiency of the turbomachinery when the load varied, which was conducive to the stabilization of the system.

Key words: heat exchanger, phase change material, Brayton cycle, temperature fluctuation, load variation, dynamic characteristics

中图分类号: 

  • TK123

图1

PCM-PCHE的物理模型[24]"

图2

用于数值模拟计算的单元示意图"

图3

PCM-PCHE内部传热模型示意图"

表1

3层PCM梯级布置及EG的物理参数[24]"

层级 填充材料 密度/(kg·m-3) 比热容/[kJ/(kg·K)] 导热系数/[W/(m·K)] 潜热/(kJ/kg) 熔点/K
PCM1 KOH 2 110.0 1.47 0.50 149.7 653.15
PCM2 NaNO2 1 810.0 1.71 0.67 180.0 531.15
PCM3 D-Mannitol 1 485.0 2.05 0.31 326.0 436.00
EG EG 4.1 0.71 129.00

图4

再压缩布雷顿循环示意图"

表2

PCM-PCHE与实验值的温度及误差对比"

项目 Th, i/K Tc, i/K Th, o/K Tc, o/K
实验值 750.0 389.0 418.0 698.0
PCM-PCHE模型值 737.0 389.1 418.5 706.9
相对误差/% 1.73 0.03 0.12 1.28

图5

PCM-PCHE在温度波动下的数值模拟计算结果及其关联式拟合"

图6

SCO2布雷顿循环仿真中三层PCM在温度波动下的响应情况"

图7

超临界二氧化碳布雷顿循环中各关键参数在温度波动情况下的对比"

图8

SCO2布雷顿循环仿真中3层PCM在负载变化下的响应情况"

图9

SCO2布雷顿循环中各关键参数在温度波动情况下的对比"

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