| 59 | 0 | 22 |
| 下载次数 | 被引频次 | 阅读次数 |
【目的】超临界二氧化碳布雷顿循环发电系统中预冷器所处的高压工况可能导致芯体结构破坏,影响系统安全稳定运行。为研究印刷电路板形式预冷器在设计参数下的应力强度,避免破坏现象发生,【方法】本文采用有限元方法比较了热流体压力9.3 MPa和冷流体压力0.55 MPa条件下,流道内顺列和错列类菱形翅片排布芯体的应力强度,并参照JB 4732—1995《钢制压力容器——分析设计标准》(2005年确认)及美国机械工程师协会《锅炉及压力容器规范》相关规定对其进行了应力强度评定和结构优化。【结果】研究表明,翅片错列排布的芯体最大应力强度为252.91 MPa,翅片顺列排布的芯体最大应力强度为282.12 MPa,高应力强度区位于热流体流道翅片根部前后缘与冷流体流道板片的连接处;热冷流体间8.75 MPa的压差和沿流动方向相邻两列翅片4.0 mm的间距导致翅片顺列排布的芯体冷流体流道上下板片存在大面积高应力强度区;对于流道内翅片顺列排布的芯体,调整冷流体压力及增大冷流体流道上下板片厚度,可使特定路径一次局部薄膜应力强度与一次弯曲应力强度之和减小。【结论】本文研究结果为紧凑式换热器的研发提供了一定参考。
Abstract：[Objective] The high pressure condition of the precooler in the supercritical carbon dioxide Brayton Cycle power generation system may lead to the damage of the core structure and affect the safe and stable operation of the system. In order to study the stress intensity of the precooler in the form of printed circuit board under the design parameters, [Methods] the finite element method was used to compare the stress intensity of the hot fluid pressure of 9.3 MPa and the cold fluid pressure of 0.55 MPa, and the stress intensity of the core with in-line and staggered diamondlike fins in the flow channel. The stress intensity assessment and structural optimization were carried out according to the relevant provisions of JB 4732—1995 Steel Pressure Vessel Analysis and Design Standard and Boiler(Confirmed in 2005)and Pressure Vessel Code from the American Society of Mechanical Engineers. [Results] The results show that the maximum stress intensity of the core with staggered arrangement of fins is 252.91 MPa, and the maximum stress intensity of the core with in-line arrangement of fins is 282.12 MPa. The high stress intensity area is located at the connection between the front and rear edges of the fin root of the hot fluid flow channel and the plate of the cold fluid flow channel. The 8.75 MPa pressure difference between the hot and cold fluids and the 4.0 mm spacing between the two adjacent rows of fins along the flow direction lead to a large area of high stress intensity zone on the upper and lower plates of the core cold fluid flow channel arranged in sequence. For the core with in-line arrangement of fins in the flow channel, adjusting the cold fluid pressure and increasing the thickness of the upper and lower plates of the cold fluid flow channel can reduce the sum of the primary local membrane stress intensity and the primary bending stress intensity in a specific path. [Conclusion] The research results in this paper provide a reference for the development of compact heat exchangers.
[1]郭子岗，张海龙，梁舒婷.超临界CO2锅炉研究综述[J].电力科技与环保，2023,39(6):490-496.GUO Zigang,ZHANG Hailong,LIANG Shuting.Review of the studies on supercritical CO2 boilers[J].Electric Power Technology and Environmental Protection,2023,39(6):490-496.
[2]WANG Y M,XIE G N,ZHU H T,et al.Assessment on energy and exergy of combined supercritical CO2 brayton cycles with sizing printed-circuit-heat-exchangers[J].Energy,2023,263:125559.
[3]ZHONG S G,REN Y,WANG P D,et al.Experimental test of rectangular microchannel printed circuit heat exchanger using supercritical carbon dioxide as working fluid[J].The Journal of Supercritical Fluids,2023,200:105967.
[4]LIU S H,HUANG Y P,WANG J F,et al.Experimental study of thermal-hydraulic performance of a printed circuit heat exchanger with straight channels[J].International Journal of Heat and Mass Transfer,2020,160:120109.
[5]LIU S H,HUANG Y P,WANG J,et al.Experimental study on transitional flow in straight channels of printed circuit heat exchanger[J].Applied Thermal Engineering,2020,181:115950.
[6]NIKITIN K,KATO Y,NGO L.Printed circuit heat exchanger thermal-hydraulic performance in supercritical CO2 experimental loop[J].International Journal of Refrigeration,2006,29(5):807-814.
[7]BAIK S,KIM S G,LEE J,et al.Study on CO2-water printed circuit heat exchanger performance operating under various CO2phases for S-CO2 power cycle application[J].Applied Thermal Engineering,2017,113:1536-1546.
[8]YANG Y,LI H Z,YAO M Y,et al.Investigation on the effects of narrowed channel cross-sections on the heat transfer performance of a wavy-channeled PCHE[J].International Journal of Heat and Mass Transfer,2019,135:33-43.
[9]NGO T L,KATO Y,NIKITIN K,et al.New printed circuit heat exchanger with S-shaped fins for hot water supplier[J].Experimental Thermal and Fluid Science,2006,30(8):811-819.
[10]TSUZUKI N,KATO Y,ISHIDUKA T.High performance printed circuit heat exchanger[J].Applied Thermal Engineering,2007,27(10):1702-1707.
[11]KIM D E,KIM M H,CHA J E,et al.Numerical investigation on thermal-hydraulic performance of new printed circuit heat exchanger model[J].Nuclear Engineering and Design,2008,238(12):3269-3276.
[12]TANG L H,PAN J,SUNDEN B.Investigation on thermalhydraulic performance in a printed circuit heat exchanger with airfoil and vortex generator fins for supercritical liquefied natural gas[J].Heat Transfer Engineering,2020,42(10):1-21.
[13]LI Z,LU D G,WANG Z C,et al.Analysis on flow and heat transfer performance of S-CO2 in airfoil channels with different fin angles of attack[J].Energy,2023,282:128600.
[14]REN Guanyu,ZHANG Yifei,LI Xinze,et al.Hybrid optimization for structure of printed circuit heat exchanger with airfoil fins[J].International Journal of Thermal Sciences,2025,212:109803.
[15]于改革，姚志燕，陈永东，等.印刷电路板式换热器板片结构强度设计[J].压力容器，2018,35(12):42-46.YU Gaige,YAO Zhiyan,CHEN Yongdong,et al.Study on the strength design of the plate of printed circuit heat exchanger[J].Pressure vessel Technology,2018,35(12):42-46.
[16]吴家荣，李红智，杨玉，等.超临界二氧化碳动力循环中印刷电路板换热器芯体机械应力和热应力耦合分析[J].中国电机工程学报，2022,42(2):640-650.WU Jiarong,LI Hongzhi,YANG Yu,et al.Coupling analysis of mechanical stress and thermal stress of printed circuit heat exchanger core in supercritical carbon dioxide power cycle[J].Proceedings of the CSEE,2022,42(2):640-650.
[17]XU Z R,CHEN W N,LIAN J,et al.Study on mechanical stress of semicircular and rectangular channels in printed circuit heat exchangers[J].Energy,2022,238:121655.
[18]LEE Y,LEE J I.Structural assessment of intermediate printed circuit heat exchanger for sodium-cooled fast reactor with supercritical CO2 cycle[J].Annals of Nuclear Energy,2014,73:84-95.
[19]TORRE D L T R,FRANCOIS J L,LIN C X.Assessment of the design effects on the structural performance of the printed circuit heat exchanger under very high temperature condition[J].Nuclear Engineering and Design,2020,365:110713.
[20]RAJI A P.Thermostructural analysis on airfoil fin printed circuit heat exchanger using supercritical CO2[J].Journal of Thermal Analysis and Calorimetry,2024,149:4153-4177.
[21]YANG Y,LI H Z,XIE B B,et al.Experimental study of the flow and heat transfer performance of a PCHE with rhombic fin channels[J].Energy Conversion and Management,2022,254:115137.
[22]XU X Y,MA T,LI L,et al.Optimization of fin arrangement and channel configuration in an airfoil fin PCHE for supercritical CO2cycle[J].Applied Thermal Engineering,2014,70(1):867-875.
[23]王洪普，刘涛，宋炜，等.不同结构的船用系统紧凑高效换热器强度和可靠性分析[J].船舶与海洋工程，2022,38(6):46-52.WANG Hongpu,LIU Tao,SONG Wei,et al.Reliability comparative analysis of marine compact and high efficiency heat exchangers with different structures[J].Naval Architecture and Ocean Engineering,2022,38(6):46-52.
基本信息:
DOI：10.19944/j.eptep.1674-8069.2025.06.006
中图分类号:TK172;TN41
引用信息:
[1]吴家荣,杨玉,倪依柯,等.非连续型流道印刷电路板换热器结构研究[J].电力科技与环保,2025,41(06):922-929.DOI:10.19944/j.eptep.1674-8069.2025.06.006.
基金信息:
国家重点研发计划项目(2023YFB4102201)