基于有限元法的甲醇回收精馏塔强度计算及安全评价
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摘要
甲醇回收精馏塔是天然气开采过程中含醇污水回收利用的关键设备。在回收甲醇的同时,含醇污水的强腐蚀性会使精馏塔壁厚减薄导致塔身应力改变。为了评价某典型精馏塔在使用过程中的应力状况,基于有限元法建立精馏塔的结构模型,分析精馏塔塔身的应力分布,得出各部分的应力数值。综合考虑塔身材料及腐蚀速率等因素,经评估得出精馏塔的剩余寿命为9年,该结论对精馏塔的安全运行具有重要的参考价值。
Methanol recovery distillation column is one of the key equipment used for the recovery and utilization of methanol from sewage in the process of natural gas extraction. In the process of recovering methanol,the wall thickness of the distillation column is thinning due to corrosion and causing stress change of the distillation column. The structure model of a typical distillation column is established and its stress distribution is analyzed by means of the finite element method. Con sidering the corrosion rate and the materials of the distillation column, the remaining life of the distillation column is e valuated as 9 years,which has important theoretical reference value for safe operation and practical engineering application.
Methanol recovery distillation column is one of the key equipment used for the recovery and utilization of methanol from sewage in the process of natural gas extraction. In the process of recovering methanol,the wall thickness of the distillation column is thinning due to corrosion and causing stress change of the distillation column. The structure model of a typical distillation column is established and its stress distribution is analyzed by means of the finite element method. Con sidering the corrosion rate and the materials of the distillation column, the remaining life of the distillation column is e valuated as 9 years,which has important theoretical reference value for safe operation and practical engineering application.
引文
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[11]魏化中,周小兵,舒安庆,等.含组合腐蚀缺陷压力管道剩余强度分析[J].化工设备与管道,2007,44(2):42-50.
[12]SH/T 3001-2005,石油化工设备抗震鉴定标准[S].
[13]NB/T 47041-2014,塔式容器[S].
[14]GB 50009-2012,建筑结构荷载规范[S].
[2]王登海,王遇冬.长庆气田含醇污水甲醇回收工艺技术探讨[J].石油与天然气化工,2001,30(3):151-153.
[3]呼延念超,李亚萍,张明礼,等.原料及塔底废水甲醇浓度对甲醇再生装置能耗的影响分析[J].石油与天然气化工,2010,39(4):365-367.
[4]LIU X,OKAFOR P C,ZHENG Y G.The inhibition of CO2corrosion of N80 mild steel in single liquid phase and liquid particle two-phase flow by aminoethyl imidazoline derivatives[J].Corrosion Science,2009,51:744-751.
[5]CCHOI Y S,NESIC S,LING SHIUN.Effect of H2S on the CO2corrosion of carbon steel in acidic solutions[J].Electrochimica Acta,2011,56:1 752-1 760.
[6]NAZARI M H,ALLAHKARAM S R,KERMANI M B.The effects of temperature and p H on the characteristics of corrosionproduct in CO2corrosion of grade X70 steel[J].Materials and Design,2010,31:3 559-3 563.
[7]杨志刚,张宁生,吴新民.氧化絮凝/缓蚀阻垢技术处理气田含醇污水研究[J].天然气工业,2004,24(10):114-117.
[8]ADIB-RAMEZANI H,JEONG J,PLUVINAGE G.Structural integrity evaluation of X52 gas pipes subjected to external cor rosion defects using the SINTAP procedure[J].International Journal of Pressure Vessels and Piping,2006,83(6):420-432.
[9]骆华锋,白清东,王莉.基于有限元法在腐蚀管道剩余强度中的应用[J].科学技术与工程,2008,8(23):6 335-6 343.
[10]LIN XB,SMITH RA.Finite element modelling of fatigue crack growth of surface cracked plates:Part I:The numerical technique[J].Engineering Frature Mechanics,1999,63(5):503-522.
[11]魏化中,周小兵,舒安庆,等.含组合腐蚀缺陷压力管道剩余强度分析[J].化工设备与管道,2007,44(2):42-50.
[12]SH/T 3001-2005,石油化工设备抗震鉴定标准[S].
[13]NB/T 47041-2014,塔式容器[S].
[14]GB 50009-2012,建筑结构荷载规范[S].