油浆蒸汽发生器管板应力槽结构参数研究
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摘要
由于工作环境恶劣,油浆蒸汽发生器经常发生管板及管头应力腐蚀开裂,造成停车、停产等重大事故,为了改善管头部位的焊后残余应力,研究并应用了一种新型的减应力槽结构。在某一减应力槽专利的基础上,借助ANSYS数值模拟软件,验证减应力槽降低焊后残余应力的作用,同时通过控制变量的手段,进一步研究减应力槽的槽深、槽宽及倒角等3个结构参数对油浆蒸汽发生器管头部分应力分布的影响,进而得出结论。模拟过程中模型的材料参数、热源参数和焊接工艺参数均取自实际生产,边界条件等的设定也与实际生产吻合,因此分析所得结论具有较高的可靠性,可为减应力槽的研究及实际加工提供借鉴与指导。
The slurry steam generator owing to its bad working environment,occurred pipe plate and pipe head stress corrosion cracking frequently,and it also resulted in the shutdown of production and other major accidents,in order to improve the welding residual stress of pipe head,a new type of stress reduction groove structure was studied and applied.On the basis of the patent of stress reduction groove,and by using ANSYS numerical simulation software,the stress reduction groove's effect of reducing residual stress after welding was verified,at the same time,further studied three structure parameters of groove depth,groove width and chamfering which affected on the stress distribution of slurry steam generator's tube head part with the method of control variables,finally came to the conclusion.In the simulation,the parameters of material,heat source and welding process were all taken from actual production,and the setting of boundary conditions were also consistent with the actual situation.Therefore,the conclusions obtained from the analysis were highly reliable,which can provide reference and guidance for the research and actual processing of stress reduction groove.
The slurry steam generator owing to its bad working environment,occurred pipe plate and pipe head stress corrosion cracking frequently,and it also resulted in the shutdown of production and other major accidents,in order to improve the welding residual stress of pipe head,a new type of stress reduction groove structure was studied and applied.On the basis of the patent of stress reduction groove,and by using ANSYS numerical simulation software,the stress reduction groove's effect of reducing residual stress after welding was verified,at the same time,further studied three structure parameters of groove depth,groove width and chamfering which affected on the stress distribution of slurry steam generator's tube head part with the method of control variables,finally came to the conclusion.In the simulation,the parameters of material,heat source and welding process were all taken from actual production,and the setting of boundary conditions were also consistent with the actual situation.Therefore,the conclusions obtained from the analysis were highly reliable,which can provide reference and guidance for the research and actual processing of stress reduction groove.
引文
[1]高磊,张迎恺,张莹莹,等.减应力槽技术在油浆蒸汽发生器管板上的应用[J].石油化工设备技术,2011,32(6):16-18,73-74.
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[12]蒋文春,巩建鸣,陈虎,等.换热器管子与管板焊接接头残余应力数值模拟[J].焊接学报,2006(12):1-4,113.
[13]崔勃,朱健,安文海.减应力槽技术在换热器管板上的应用[J].中国特种设备安全,2012,28(5):14-16.
[2]刘志胜.油浆蒸汽发生器泄漏原因分析及改进措施[J].石油化工设备技术,2007(6):25-26,30.
[3]刘丙会.油浆蒸汽发生器管板失效分析[J].石油化工设备技术,2007(1):57-61,70.
[4]刘家伦,朱浩,姜月,等.Evolution of residual stress field in 6N01aluminum alloy friction stir welding joint[J].China Welding,2018,27(4):18-26.
[5]徐利霞.焊接残余应力场在交变载荷作用下的特性研究[D].大连:大连理工大学,2006.
[6]艾建波,王宝功,屈武第.油浆蒸汽发生器管板裂纹浅析[J].石油化工设备技术,2000(6):57-59.
[7]李占明,杜晓坤,孙晓峰,等.Research of precise pulse plasma arc powder welding technology of thin-walled inner hole parts[J].China Welding,2017,26(3):57-62.
[8]丁建华.油浆蒸汽发生器管板开裂原因与控制[J].通用机械,2006(8):72-76.
[9]卜英南,高磊,张莹莹.油浆蒸汽发生器管板与换热管焊缝处焊接残余应力模拟[J].辽宁石油化工大学学报,网络出版时间:2018-04-10.
[10]郭潇潇,张莹莹,高磊,等.钛换热管与管板焊接的气体保护措施优化[J].辽宁石油化工大学学报,网络出版时间:2018-09-04.
[11]田全荣,刘金合,王世清.基于生死单元的组合热源在GMAW焊接中的应用[J].热加工工艺,2012,41(7):163-165.
[12]蒋文春,巩建鸣,陈虎,等.换热器管子与管板焊接接头残余应力数值模拟[J].焊接学报,2006(12):1-4,113.
[13]崔勃,朱健,安文海.减应力槽技术在换热器管板上的应用[J].中国特种设备安全,2012,28(5):14-16.
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