刘骁飞,龚程程,金浩哲,偶国富

• 1:浙江理工大学流动腐蚀研究所

摘要(Abstract)：

针对某石化企业I、II系列渣油加氢空冷系统,基于工艺过程的关联分析,采用逆序倒推法构建工艺仿真模型,阐明流动-传热-相变环境下铵盐结晶腐蚀和多相流冲蚀机理,确定将腐蚀因子Kp、流速、硫氢化铵(NH4HS)浓度等作为控制加氢空冷系统流动腐蚀的关键参数群;针对构建的工艺仿真模型,实现流动腐蚀关键参数群的风险预测。结果表明:标况下,空冷器进口K_p<0.5,NH_4HS浓度<4%,与美国石油协会932B(API932B)推荐的指标相比,多相流冲蚀风险相对较小。然而,I、II系列空冷器第6管排内管束的流速分别偏低36%和36.5%,存在一定的铵盐结晶腐蚀的风险。基于构建的流动腐蚀风险预测结果,建立了以加氢控制空冷系统管束内K_p、流速、NH_4HS浓度等关键流动腐蚀影响参数的控制方法,提出降低注水量、减少管束根数的耐流动腐蚀防控策略;并以提升管束内流速、满足传热要求为目标函数,实现了传热效率校核。该方案在加氢空冷器流动腐蚀防控的基础上,为装置的优化运行和操作提供了重要数据支撑。

关键词(KeyWords)： 渣油加氢;空冷器;流动腐蚀;预测方法;防控策略

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51876194,51806198,U1909216)

作者(Author): 刘骁飞,龚程程,金浩哲,偶国富

参考文献(References)：

• [1]郭建华.加氢裂化高压空冷器国产化进程简述[J].石油化工设备,2009,38(1):62-65.GUO J H.Domestic application of hydrocrack reactor effluent cooler[J].Petro-Chemical Equipment,2009,38(1):62-65.
• [2]孙彦霖,王宽心,偶国富,等.加氢空冷器NH4Cl流动沉积特性数值模拟[J].炼油技术与工程,2017,47(6):44-49.SUN Y L,WANG K X,OU G F,et al.Numerical simulation of flow deposition of NH4Cl particles air cooler of hydrogenation unit[J].Petroleum Refinery Engineering,2017,47(6):44-49.
• [3]姜爱国,张建文,辛亚男,等.加氢裂化空冷器管束多相流冲刷腐蚀数值模拟[J].中国腐蚀与防护学报,2019,39(2):192-200.JIANG A G,ZHANG J W,XIN Y N,et al.Numerical simulation of multiphase erosion-corrosion of tubes bundles of hydrocracking air cooler[J].Journal of Chinese Society For Corrosion and Protection,2019,39(2):192-200.
• [4]偶国富,徐晓峰,吕文超,等.高压空冷器入口管束内流动参数分布特性的数值模拟[J].石油学报(石油加工),2019,35(1):111-118.OU G F,XU X F,LU W C,et al.Numerical simulation of flow parameter distribution characteristics in inlet pipes of high pressure air-coolers[J].Acta Petrolei Sinica (Petroleum Processing Section),2019,35(1):111-118.
• [5]张志宏.原料性质对渣油加氢装置的影响及控制效果[J].石油炼制与化工,2018,49(10):38-42.ZHANG Z H.Influence of feedstocks properties on residue hydrotreating unit and its control effect[J].Petroleum Processing and Petrochemicals,2018,49(10):38-42.
• [6]ZHENG Z J,OU G F,YE H J,et al.Investigation on the deposition failure of a reactor effluent air cooler in hydrocracking unit[J].Engineering Failure Analysis,2016,68:52-63.
• [7]ZHU M,SUN L,OU G F,et al.Erosion corrosion failure analysis of the elbow in sour water stripper overhead condensing reflux system[J].Engineering Failure Analysis,2016,62:93-102.
• [8]JIN H Z,CHEN X P,ZHENG Z J,et al.Failure analysis of multiphase flow corrosion-erosion with three-way injecting water pipe[J].Engineering Failure Analysis,2017,73:46-56.
• [9]CAYARD M S,GIESBRECHT W G,HORVATH R J,et al.Prediction of ammonium bisulfide corrosion and validation with refinery plant experience[C]//NACE,International Corrosion Conference Series.Houston:NACE International,2006:1-9.
• [10]American Petroleum Institute.Design,materials,fabrication,operation,and inspection guidelines for corrosion control in hydroprocessing reactor effluent air cooler (REAC) systems:API RP 932-B-2012(2014)[S].Washington D C:API Publishing Services,2014.
• [11]JAMES T.Design of hydroprocessing effluent washwater systems[C]//NACE,International Corrosion Conference Series.Houston:NACE International,1998:1-13.
• [12]MUNSON B R,CAYARD M S.Thermodynamic derivations of various ammonium salt deposition equations common to the refining industry[J].Corrosion,2018,74(10):1158-1163.
• [13]偶国富,王宽心,谢浩平,等.加氢空冷系统硫氢化铵结晶规律的数值模拟[J].高校化学工程学报,2013,27(2):354-359.OU G F,WANG K X,XIE H P,et al.Numerical simulation of ammonium hydrosulphides crystallization rules in hydrogeneration air-cooling system[J].Chemical Engineering of Chinese Universities,2013,27(2):354-359.
• [14]金浩哲,叶浩杰,偶国富,等.基于偏最小二乘法的加氢换热器NH4Cl结晶温度预测模型[J].石油学报(石油加工),2017,33(6):1176-1182.JIN H Z,YE H J,OU G F,et al.Predicting model of ammonium salt crystallization temperature based on partial least squares approach in a hydrogenation heat-exchanger[J].Acta Petrolei Sinica (Petroleum Processing Section),2017,33(6):1176-1182.
• [15]ZHU M,OU G F,JIN H Z,et al.Top of the REAC tube corrosion induced by under deposit corrosion of ammonium chloride and erosion corrosion[J].Engineering Failure Analysis,2015,57:483-489.
• [16]ALVISI P P,LINS V D F C.Acid salt corrosion in a hydro-treatment plant of a petroleum refinery[J].Engineering Failure Analysis,2008,15(8):1035-1041.
• [17]PIEHL R L,SINGH A,HARVEY C.Corrosion of reactor effluent air coolers[C]//NACE,International Corrosion Conference Series.Houston:NACE International,1997:1-9.
• [18]HORVATH R J,CAYARD M S,KANE R D.Prediction and assessment of ammonium bisulfide corrosion under refinery sour water service conditions[C]//NACE,International Corrosion Conference Series.Houston:NACE International,2006:1-20.
• [19]HORVATH R J,LAGAD V V,SRINIVASAN S,et al.Prediction and assessment of ammonium bisulfide corrosion under refinery sour water service conditions-part 2[C]//NACE,International Corrosion Conference Series.Houston:NACE International,2010:1-18.
• [20]ZHENG Z J,OU G F,YE H J,et al.Analysis on the under deposit corrosion of air cooler tubes:Thermodynamic,numerical and experimental study[J].Engineering Failure Analysis,2017,79:726-736.
• [21]偶国富,郑智剑,金浩哲,等.叶片式静态混合器多相流动特性的数值分析[J].高校化学工程学报,2016,30(1):40-47.OU G F,ZHENG Z J,JIN H Z,et al.Numerical analysis on the multiphase flow characteristics of static blade mixer[J].Chemical Engineering of Chinese Universities,2016,30(1):40-47.
• [22]OU G F,WANG K X,ZHAN J L,et al.Failure analysis of a reactor effluent air cooler[J].Engineering Failure Analysis,2013,31:387-393.
• [23]VALEH-E-SHEYDA P,RASHIDI H.Inhibition of corrosion in amine air cooled heat exchanger:Experimental and numerical study[J].Applied Thermal Engineering,2016,98(1):1241-1250.
• [24]SRINIVASAN S,YAP KM,HORVATH Ret al.Prediction and assessment of ammonium bisulfide corrosion under refinery sour water service conditions-Part3[C]//NACE,International Corrosion Conference Series.Houston:NACE International,2017:4349-4364.
• [25]OU,G F,JIN H Z,XIE H P,et al.Prediction of ammonium salt deposition in hydroprocessing air cooler tubes[J].Engineering Failure Analysis,2011,18:1458-1464.
• [26]YAN X,SUN J,MENG Y.Experimental insight into the chemical corrosion mechanism of copper with an oil-in-water emulsion solution[J].RSC Advances,2018,8(18):9833-9840.
• [27]YANG Y,GUO J,REN B,et al.Oil-water flow patterns,holdups and frictional pressure gradients in a vertical pipe under high temperature/pressure conditions[J].Experimental Thermal and Fluid Science,2019,100(1):271-291.
• [28]KAIN V.Flow accelerated corrosion:forms,mechanisms and case studies[J].Procedia Engineering,2014,86:576-588.
• [29]PRASAD M,GOPIKA V,SRIDHARAN A,et al.Pipe wall thickness prediction with CFD based mass transfer coefficient and degradation feedback for flow accelerated corrosion[J].Progress in Nuclear Energy,2018,107:205-214.
• [30]SUN L,ZHUM,OU G F,et al.Corrosion investigation of the inlet section of REAC pipes in the refinery[J].Engineering Failure Analysis,2016,66:468-478.
• [31]王宽心.石化系统铵盐结晶沉积预测及腐蚀规律研究[D].杭州：浙江理工大学,2014.WANG K X.Ammonium salt crystal deposition prediction and corrosion behavior of petrochemical system[D].Hangzhou:Zhejiang Sci-tech University,2014.