液化天然气储罐大角焊缝区域应力影响因素
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摘要
利用ANSYS对16万m3全容式液化天然气储罐金属内罐应力最大、最危险的大角焊缝区域建立参数化模型分析其安全性,通过计算得到了不同罐底边缘板厚度、边缘板外伸长度、焊缝内坡口尺寸以及内侧角焊缝焊脚长度的应力分布曲线。结果表明,在一定范围内改变以上4个尺寸,可以不同程度地改变其大角焊缝的最大应力和薄膜应力。据此给出了这4个尺寸的取值范围。
In a liquefied nature gas(LNG)cryogenic tank with a volume of 160 thousand m3, the shell-to-bottom fillet weld is one of the biggest stress and most dangerous areas.In order to analyze the security,using ANSYS to establish the parameterized model of shell-to-bottom fillet weld,and then through calculating,the stress distribution results and stress influencing curve of twenty three kinds of models are obtained under the situation of different thickness and overhang length of annular plate,different sizes of the inner weld bead bevel and the different lengths of fillet weld.The result shows that in a certain range,changing the sizes of the above four aspects can change the biggest stress and membrane stress of shell-to-bottom fillet weld at different levels,and at the same time giving the recommended value ranges of the four size.
In a liquefied nature gas(LNG)cryogenic tank with a volume of 160 thousand m3, the shell-to-bottom fillet weld is one of the biggest stress and most dangerous areas.In order to analyze the security,using ANSYS to establish the parameterized model of shell-to-bottom fillet weld,and then through calculating,the stress distribution results and stress influencing curve of twenty three kinds of models are obtained under the situation of different thickness and overhang length of annular plate,different sizes of the inner weld bead bevel and the different lengths of fillet weld.The result shows that in a certain range,changing the sizes of the above four aspects can change the biggest stress and membrane stress of shell-to-bottom fillet weld at different levels,and at the same time giving the recommended value ranges of the four size.
引文
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[4]骆晓玲,齐长勇,程换新.大型液化天然气储罐的发展研究[J].机械设计制造,2009,9(4):31-34.(LUO Xiao-ling,QI Chang-yong,CHENG Huan-xin.Large-scale Liquid Natural Gas Storage Tank Development Research[J].Machinery Design and Manufacture,2009,9(4):31-34.)
[5]邵显东,杨秀丽,金玲玲.大型钢制焊接双层低温储罐设计若干问题的讨论[J].齐鲁石油化工,2001,29(3):248-251.(SHAO Xian-dong,YANG Xiu-li,JIN Ling-ling.Large Double Cryogenic Tanks Welded Steel Design Discussion on the Issues[J].QiLu Petrochemical Technology,2001,29(3):248-251.)
[6]王国平,陈学东,王冰.超低碳9Ni钢焊接接头低温韧性[J].焊接学报,2008,29(3):37-40.(WANG Guo-ping,CHEN Xue-dong,WANG Bing.Ultra-low Carbon 9Ni Steel Welded Joints at Low Temperature[J].Transactions of the China Welding Institution,2008,29(3):37-40.)
[7]贺宇,杨梅.液化天然气的应用和国际贸易[J].天然气与石油,2005,23(2):1-5.(HE Yu,YANG Mei.LNG Applications and International Trade[J].Natural Gas and Oil,2005,23(2):1-5.
[8]GB 5034l—2003,立式圆筒型钢制焊接油罐设计规范[S].(GB 5034l—2003,Vertical Cylindrical Welded Steel Tank Design Specification[S].)
[9]王红光,崔金东.大型双壳低温储罐的设计特点[J].石油化工设备技术,2010,31(4):7-8.(WANG Hong-guang,CUI Jin-dong.Large Double Hull Design Features of Cryogenic Tanks[J].Petrochemical Equipment Technology,2010,31(4):7-8.)
[10]周永春,刘浩.LNG低温储罐绝热性能的探究[J].化工设计,2010,20(2):17-19.(ZHOU Yong-chun,LIU Hao.LNG Storage Thermal Insulation Inquiry[J].Chemical Engineering Design,2010,20(2):17-19.)