Performance analysis of double-end self-pumping mechanical seal for main coolant pump of sodium-cooled fast reactor

doi:10.11949/j.issn.0438-1157.20180101

Abstract

Abstract:

Sealing performance of reactor coolant pump is an important indicator for safety evaluation of sodium-cooled fast reactor. A double-end self-pumping mechanical seal was proposed for certain type of coolant pump for sodium-cooled fast reactor. Fluent numerical simulation at conditions of orthogonal design of experiments was performed to study influence of structural and operational parameters on open force and leakage rate of end surface. The pressure adjustment range of blocking fluid was analyzed to meet the requirement of zero argon leakage in the pump chamber. The results show that although both affect the open force within the experimental range of these parameters, the influence of ratio of groove to face width is more significant than that of helix angle. The open force was increased with the increase of ratio of groove over face width and helix angle. Also, the ratio of groove to face width had a significant effect on the leakage rate, which was increased rapidly with the increase of the ratio of groove to face width. The relationship between pressure of blocking fluid with both leakage rate and open force was obtained for conditions of maximum speed and shutdown. The mechanical seal is assured to be safe and effective at 0.05 MPa pump working pressure as long as blocking fluid pressure is controlled within 0.0528-1.6378 MPa.

Key words: reactor coolant pump, mechanical seal, CFD, orthogonal test, numerical simulation, optimization

摘要：

核主泵的密封性能是钠冷快堆安全评价的重要指标。以某型试验钠冷快堆核主泵为研究对象，提出了一种适用于钠冷快堆核主泵的双端面自泵送机械密封；运用正交试验法设计试验方案，并基于Fluent进行数值仿真模拟，探讨了该机械密封结构参数和工况参数对端面开启力和泄漏率的影响，分析了泵腔氩气零泄漏要求下的密封阻塞流体的压力调节范围。结果表明：在试验参数的范围内，槽面宽比和螺旋角对开启力均有影响，且槽面宽比影响更为显著，开启力随着槽面宽比和螺旋角的增大有上升的趋势；槽面宽比对泄漏率影响显著，泄漏率随槽面宽比的增大迅速增大。得到了最大转速和停机工况下阻塞流体压力与泄漏量、开启力的关系式；当泵腔工作压力为0.05 MPa时，只要阻塞流体压力不超出0.0528~1.6378 MPa区间均能保证密封安全有效。

关键词: 核主泵, 机械密封, 计算流体力学, 正交试验, 数值模拟, 优化

CLC Number:

TH136

CHEN Guoqi, SUN Jianjun, SUN Dianfeng, MA Chenbo. Performance analysis of double-end self-pumping mechanical seal for main coolant pump of sodium-cooled fast reactor[J]. CIESC Journal, 2018, 69(8): 3565-3576.

陈国旗, 孙见君, 孙电锋, 马晨波. 钠冷快堆核主泵用双端面自泵送机械密封性能分析[J]. 化工学报, 2018, 69(8): 3565-3576.

References 31

[1]	王玉明, 黄伟峰, 李永健. 核电站一回路用机械密封[J]. 摩擦学学报, 2011, 31(4):408-416. WANG Y M, HUANG W F, LI Y J. Mechanical seals for primary circuit of nuclear power plants[J]. Tribology, 2011, 31(4):408-416.
[2]	徐銤. 核电发展的第二代——快中子增殖堆核电站[J]. 核科学与工程, 1990, 10(4):337-349. XU M. The second generation for nuclear electricity-fast breeder reactor plant[J]. Nuclear Science and Engineering, 1990, 10(4):337-349.
[3]	王洲. 我国重点发展的先进堆型——快中子增殖堆[J]. 科技导报, 1992, 10(9):47-48. WANG Z. Stress should be put on developing the fast-breeder reactor[J]. Science and Technology Review, 1992, 10(9):47-48.
[4]	徐銤. 我国快堆发展战略目标研究[J]. 核科学与工程, 2008, 28(1):20-25. XU M. Fast reactor development strategy targets study in china[J]. Chinese Journal of Nuclear Science and Engineering, 2008, 28(1):20-25.
[5]	丁铜伟, 董博, 张强, 等. 钠冷快中子增殖堆安全监管重要关注点探讨[J]. 核动力工程, 2016, 37(s1):127-130. DING T W, DONG B, ZHANG Q, et al. Discussion on safety regulation major concerns of sodium-cooled fast breeder reactor[J]. Nuclear Power Engineering, 2016, 37(s1):127-130.
[6]	刘云娇. 俄BN-600型快堆因钠泄漏停运[J]. 国外核新闻, 1994, (2):18. LIU Y J. The Russian BN-600 fast reactor was shut down due to leakage of sodium[J]. Foreign Nuclear News, 1994, (2):18.
[7]	吴再丰. 日本"文殊号"快堆钠泄漏[J]. 科技潮, 1997, (5):30-31. WU Z F. The Japanese "wenshu" fast reactor sodium leak[J]. Tide of Science and Technology, 1997, (5):30-31.
[8]	MARTIOSON A R. Design, development and testing of large-diameter, high-pressure seals or nuclear reactor, primary-coolant pumps-a challenge to the pump manufacturer[J]. Lubrication Engineering, 1980, 36(6):325-340.
[9]	MARSI J A. Development of a 9 inch (228 mm) nuclear primary coolant seal[J]. Lubrication Engineering, 1989, 45(5):311-321.
[10]	MARSI J A. Enclosed mechanical seal face design for brittle materials[J]. Lubrication Engineering, 1994, 50(1):11-15.
[11]	闫宝秋, 张兵, 文明基, 等. 高工况条件下双端面机械密封失效分析及改造[J]. 石油化工设备, 2016, 45(3):92-96. YAN B Q, ZHANG B, WEN M J, et al. Failure analysis of the duel mechanical seal under heavy working duties and its transformation[J]. Petro-chemical Equipment, 2016, 45(3):92-96.
[12]	马希金, 包春辉, 贾维斌. 基于流固耦合油气混输泵双端面机械密封的变形分析[J]. 甘肃科学学报, 2017, 29(3):114-116. MA X J, BAO C H, JIA W B. Deformation analysis on double mechanical seal of oil-gas multiphase pump based on fluid-structure interaction[J]. Journal of Gansu Sciences, 2017, 29(3):114-116.
[13]	文朋, 翟晔. 双端面机械密封在高危油泵上的应用[J]. 化学工程与装备, 2014, (5):102-104. WEN P, ZHAI Y. Application of double-end mechanical seal on high-risk oil pump[J]. Chemical Engineering & Equipment, 2014, (5):102-104.
[14]	王财生, 黄龙文, 秦瑶, 等. 双端面机械密封的摩擦学性能研究[J]. 华东理工大学学报(自然科学版), 2013, 39(5):636-640. WANG C S, HUANG L W, QIN Y, et al. Tribology performance research for double mechanical seal[J]. Journal of East China University of Science and Technology (Natural Science Edition), 2013, 39(5):636-640
[15]	陈汇龙, 邹强, 赵斌娟, 等. 中温高黏度介质双端面主密封热力特性分析[J]. 排灌机械工程学报, 2016, 34(11):967-973. CHEN H L, ZOU Q, ZHAO B J, et al. Analysis of temperature and thermal deformation of main seal in double mechanical seal in medium with moderate temperature and high viscosity[J]. Journal of Drainage and Irrigation Machinery Engineering, 2016, 34(1):967-973.
[16]	张磊, 刘艳英, 王创, 等. 双端面机械密封失效原因及解决措施[J]. 乙烯工业, 2011, 23(1):35-38. ZHANG L, LIU Y Y, WANG C, et al. Reason for failure of double mechanical seal and the countermeasures[J]. Ethylene Industry, 2011, 23(1):35-38.
[17]	孙业洞. 双端面机械密封使用故障分析[J]. 机械, 2012, 39(11):77-80. SUN Y D. Analysis on malfunctions of dual mechanical seals[J]. Mechanical, 2012, 39(11):77-80.
[18]	李超, 刘振全, 赵荣珍. 双端面机械密封在涡旋式天然气压缩机中的应用[J]. 流体机械, 2005, 33(7):49-51. LI C, LIU Z Q, ZHAO R Z. Application of double seal faces mechanical seal on the nature gas scroll compressor[J]. Fluid Machinery, 2005, 33(7):49-51.
[19]	孙见君, 王敏, 周敏, 等. 自泵送流体动压型机械密封:201310201473. 3[P]. 2013-05-28. SUN J J, WANG M, ZHOU M, et al. Self-pumping mechanical seal based on fluid dynamic pressure principle:201310201473. 3[P]. 2013-05-28.
[20]	SUN J J, MA C B, YU Q P, et al. Numerical analysis on a new pump-out hydrodynamic mechanical seal[J]. Tribology International, 2017, 106(2):62-70.
[21]	周敏, 孙见君, 马晨波, 等. 自泵送流体动压型机械密封性能分析[J]. 化工学报, 2015, 66(2):687-694. ZHOU M, SUN J J, MA C B, et al. Performance analysis of hydrodynamic mechanical seals based on self-pumping principle[J]. CIESC Journal, 2015, 66(2):687-694.
[22]	顾东升, 孙见君, 马晨波, 等. 基于数值模拟的自泵送机械密封正交试验[J]. 化工学报, 2015, 66(7):2464-2473. GU D S, SUN J J, MA C B, et al. Orthogonal test of self-pumping mechanical seals based on numerical simulation[J]. CIESC Journal, 2015, 66(7):2464-2473.
[23]	HU J B, TAO W J, ZHAO Y M, et al. Numerical analysis of general groove geometry for dry gas seals[J]. Applied Mechanics & Materials, 2014, 457:544-551.
[24]	LI Y, SONG P Y, XU H J. Performance analyses of the spiral groove dry gas seal with inner annular groove[J]. Applied Mechanics & Materials, 2013, 420:51-55.
[25]	WANG Q, CHEN H L, LIU T, et al. Research on performance of upstream pumping mechanical seal with different deep spiral groove[J]. IOP Conference Series:Earth and Environmental Science, 2012, 15(7):072019-072027
[26]	BASU P. Analysis of a radial groove gas face seal[J]. ASLE Transactions, 1992, 35(1):11-20.
[27]	NICOLESCU B N, PETRESCU T C. Homogenization of the Reynolds equation in the radial face seals case[J]. Asymptotic Analysis, 2013, 81(1):35-52.
[28]	RUAN B. Finite element analysis of the spiral groove gas face seal at the slow speed and the low pressure conditions-slip flow consideration[J]. Tribology Transactions, 2000, 43(3):411-418.
[29]	HU X P, SONG P Y. Theoretic analysis of the effect of real gas on the performance of the T-groove and radial groove dry gas seal[J]. Applied Mechanics and Materials, 2013, 271/272(1):1218-1223.
[30]	滕海英, 祝国强, 黄平, 等. 正交试验设计实例分析[J]. 药学服务与研究, 2008, 8(1):75-76. TENG H Y, ZHU G Q, HUANG P, et al. Orthogonal experiment design case analysis[J]. Pharm Care and Research, 2008, 8(1):75-76.
[31]	李云雁, 胡传荣. 试验设计与数据处理[M]. 北京:化学工业出版社, 2009. LI Y Y, HU C R. Experiment Design and Data Processing[M]. Beijing:Chemical Industry Press, 2009.