烟气轮机入口法兰变形与裂纹原因分析
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摘要
某石化公司催化裂化装置烟气轮机(简称烟机)入口锥形短节的2对对焊法兰接头区域,近些年来频繁出现裂纹,存在着焊缝断裂的安全隐患;短节内侧法兰严重变形,法兰间隙从8mm减小到1.5mm,无法进行今后的开机热紧工作,存在着法兰处泄漏烟气的风险,二者均影响烟机的安全平稳运行。文章从管道布置、金属材质、焊接工艺和操作工况等方面分析了焊缝裂纹和法兰变形的原因,发现焊口区域容易发生高温蠕变、晶间开裂,焊缝韧性、延展性变差,预紧力过大均是产生失效的原因,并根据原因分析提出了相应的改进建议。
Cracks occur frequently around the two pairs of welding neck flange at the short inlet cone section of the FCC flue gas turbine in certain petrochemical company in recent years.So there're hidden dangers of weld fracture.There's serious flange deformation inside the short section.The flange clearance is decreased from 8mm to 1.5mm and it's impossible to carry out the start-up and thermal fastening.There is risk of flue gas leakage around the flange.These may affect the safe and stable operation of the flue gas turbine.This paper analyzes the weld cracking and flange deformation from such aspects as pipeline layout,metal material,welding process and operating conditions.It is discovered that high temperature creep,intergranular cracking,deteriorating weld toughness and ductility and too large preload occur easily around the weld junction.These are the causesfor the failure.The paper then puts forward corresponding suggestions for improvement in the light of the cause analysis.
Cracks occur frequently around the two pairs of welding neck flange at the short inlet cone section of the FCC flue gas turbine in certain petrochemical company in recent years.So there're hidden dangers of weld fracture.There's serious flange deformation inside the short section.The flange clearance is decreased from 8mm to 1.5mm and it's impossible to carry out the start-up and thermal fastening.There is risk of flue gas leakage around the flange.These may affect the safe and stable operation of the flue gas turbine.This paper analyzes the weld cracking and flange deformation from such aspects as pipeline layout,metal material,welding process and operating conditions.It is discovered that high temperature creep,intergranular cracking,deteriorating weld toughness and ductility and too large preload occur easily around the weld junction.These are the causesfor the failure.The paper then puts forward corresponding suggestions for improvement in the light of the cause analysis.
引文
[1]刘凤臣.催化裂化装置烟机入口管道设计探讨[J].化工设计,2004,14(5):24-27.
[2]文联奎,戴东生.催化裂化烟机入口管线结构的有限元计算[J].石油化工设备,1993,22(6):8-12.
[3]房家贵,冯清晓,黄荣臻.催化裂化装置烟机入口和出口管道的安装、检查和调整[J].石油化工设备技术,2005,26(1):35-36.
[4]杨青,祁鲁海.催化裂化烟气轮机入口管道的设计[J].化工设计,2004,19(3):28-31.
[5]任明威,齐龙.催化裂化装置烟机入口管道热位移分析[J].广东化工,2014,41(10):124-125.
[6]马金华,蔡善祥,施凯伦.催化裂化装置烟机入口管线及其膨胀节事故失效分析有限元计算[J].化工设备与管道,2007,44(2):38-41.
[7]郑斌,陆晓峰,周丽芳.催化裂化装置烟机入口管线及其法兰接头失效的有限元分析及优化设计[J].化工机械,2008,35(1):22-26.
[8]李海三,沈书乾.一再三旋至烟机管线裂纹产生原因分析及改进方法[J].石油和化工设备,2011,11(12):47-48.
[9]赵培禄,胥晓东,刘燕.高温烟气管道开裂成因与对策分析[J].炼油技术与工程,2004,34(1):37-39.
[10]潘罗其.烟机入口烟气管道裂纹分析及改造[J].炼油技术与工程,2007,37(3):18-21.
[11]戴毅,王佳兵.催化裂化装置烟机入口管线焊缝开裂分析[J].广东化工,2012,39(3):172-175.
[12]杨永磊,魏军.不锈钢管道裂纹产生原因分析[J].焊接技术,2009,38(9):62-64.
[13]杨德凤,刘凯,张金锐.从催化裂化烟气分析结果探讨再生设备的腐蚀开裂[J].石油炼制与化工,2001,32(3):49-53.
[2]文联奎,戴东生.催化裂化烟机入口管线结构的有限元计算[J].石油化工设备,1993,22(6):8-12.
[3]房家贵,冯清晓,黄荣臻.催化裂化装置烟机入口和出口管道的安装、检查和调整[J].石油化工设备技术,2005,26(1):35-36.
[4]杨青,祁鲁海.催化裂化烟气轮机入口管道的设计[J].化工设计,2004,19(3):28-31.
[5]任明威,齐龙.催化裂化装置烟机入口管道热位移分析[J].广东化工,2014,41(10):124-125.
[6]马金华,蔡善祥,施凯伦.催化裂化装置烟机入口管线及其膨胀节事故失效分析有限元计算[J].化工设备与管道,2007,44(2):38-41.
[7]郑斌,陆晓峰,周丽芳.催化裂化装置烟机入口管线及其法兰接头失效的有限元分析及优化设计[J].化工机械,2008,35(1):22-26.
[8]李海三,沈书乾.一再三旋至烟机管线裂纹产生原因分析及改进方法[J].石油和化工设备,2011,11(12):47-48.
[9]赵培禄,胥晓东,刘燕.高温烟气管道开裂成因与对策分析[J].炼油技术与工程,2004,34(1):37-39.
[10]潘罗其.烟机入口烟气管道裂纹分析及改造[J].炼油技术与工程,2007,37(3):18-21.
[11]戴毅,王佳兵.催化裂化装置烟机入口管线焊缝开裂分析[J].广东化工,2012,39(3):172-175.
[12]杨永磊,魏军.不锈钢管道裂纹产生原因分析[J].焊接技术,2009,38(9):62-64.
[13]杨德凤,刘凯,张金锐.从催化裂化烟气分析结果探讨再生设备的腐蚀开裂[J].石油炼制与化工,2001,32(3):49-53.
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