共查询到19条相似文献,搜索用时 109 毫秒
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工业循环冷却水腐蚀速率模型的研究 总被引:1,自引:0,他引:1
循环冷却水在工业生产中占有很大比重,而腐蚀是循环冷却水系统中常见的水质故障,严重影响工业生产中设备的运行。通过对某石化公司水质数据的分析,选取对腐蚀速率影响较大的水质参数,凭借神经网络良好的非线性能力,基于NARX神经网络建立了腐蚀速率预测模型。利用该模型对循环冷却水系统腐蚀速率进行预测,结果较好,说明该模型可行,且具有良好的应用前景。 相似文献
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通过模拟试验改进某电厂以弱酸阳离子交换处理出水为补充水源的循环冷却水系统的补水方式和水质稳定剂配方,有效解决了该电厂循环冷却水系统同时存在结垢和腐蚀的问题,同时提高了浓缩倍率、节约了用水量,并使系统金属的腐蚀速率大大下降,有效保护系统设备。 相似文献
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为探究电化学对循环冷却水系统碳钢材料结垢和腐蚀的影响,构建了以Ti/RuO2阳极和Ti网阴极为核心的电化学处理系统,将其分别与旋转腐蚀速率仪和循环冷却水动态模拟系统进行联用。首先通过除垢效果和电流效率对电化学系统进行参数优化,实验结果显示,15V电压、120min处理时间为最优电化学处理参数。电化学联用旋转腐蚀速率仪实验结果显示,对于不同硬度的水质,电化学嵌入后均可降低碳钢表面垢沉积速率。XRD和SEM分析表明,碳钢表面水垢晶型以方解石为主转化为以文石为主。但当水质为软水时,电化学嵌入可明显加剧碳钢腐蚀速率;而当电化学嵌入硬水与高硬水水质时,挂片表面可形成均匀、致密的Fe3O4层,碳钢腐蚀速率由0.60mm/a、0.54mm/a分别降至0.47mm/a、0.32mm/a。电化学联用循环冷却水动态模拟装置实验结果显示,嵌入电化学模块后,循环冷却水模拟系统的污垢热阻均显著降低。经数据分析,当水质为软水时,嵌入电化学系统后碳钢腐蚀速率增大,而当水质为高硬水时,碳钢腐蚀速率分别由0.12mm/a、0.15mm/a降至0.10mm... 相似文献
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利用某石化企业40个月的循环冷却水实际生产数据,基于小神经网络进行了腐蚀预测研究。经过对比分析,得出了小波神经网络预测精度最高的网络模型为6-7-1结构。在相同输入参数向量下,对含有相同隐层节点个数的小波神经网络和BP神经网络进行腐蚀预测对比,小波神经网络比BP神经网络预测精度高。 相似文献
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Peter Smith Sudipta Roy David Swailes Stephen Maxwell David Page John Lawson 《Chemical engineering science》2011,(23):5775
A model was developed for the prediction of corrosion rates associated with steel subjected to synthetic produced water. The corrosive species included in the model, identified through water analysis conducted in the field, are sulfate, chloride and hydrogen sulfide. The effect on corrosion of these species was examined through polarization experimentation using a three electrode glass corrosion cell and potentiostat. Samples of carbon steel, used in sub-sea pipeline systems, were used at the working electrode and the experiments were carried out at similar physicochemical conditions observed in pipeline systems in the field. The model was based on heterogeneous reactions at the metal surface, with electrochemical parameters determined through experimentation employed in the model to describe the anodic and cathodic processes involved in the corrosion of steel. The model consists of a system of equations with Butler–Volmer kinetics describing the charge transfer and the Nernst diffusion model the mass transfer processes occurring in the corrosion system. The solution is based on a charge balance between the reduction and the oxidation processes which occur at the steel surface. Current density convergence criteria were used in the model to solve the system of equations for corrosion potential, surface species concentration and component current densities. The corrosion rate is determined as the rate of oxidation of iron at the surface and model results have been validated using experimental data. The model demonstrates a reasonable qualitative match with corrosion data collected in the potential region close to the corrosion potential in general, with good qualitative match in the anodic region near the corrosion potential. Some deviation occurs between model and experimental values where overpotentials become large but the model is shown to respond well to changes in input parameter values and predicts the corrosion potential and corrosion rate for each system within experimental variability and the accepted standards of accuracy. 相似文献
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当石油输送管道内处于油水分层流条件时,管道底部与酸性水层接触极易造成内腐蚀,严重威胁管道安全,传统的静止和单相流条件的腐蚀预测方法已不能指导管道的安全运行,而多相流动、离子传质、化学反应及电极动力学等多种不同尺度的物理化学过程对多相流腐蚀预测提出了挑战。本文基于多相流动特性及电化学腐蚀特性的耦合机理提出了分层流条件下腐蚀动力学模型,首先建立油水三层流传质计算模型,进而基于溶液区域和产物膜内部的传质计算,依据阴阳极电化学反应电流密度与传质通量之间的平衡关系,形成多相流条件下腐蚀预测方法。探究了离子传质、电极反应以及产物膜动态生长的耦合过程对腐蚀行为的作用机理,揭示了CO2分压、温度对腐蚀发展规律的影响机制。研究发现温度、CO2分压的改变会导致平衡反应方向的移动,从而改变离子浓度;离子的扩散系数是决定传质系数变化的内在原因;腐蚀速率的变化规律由产物膜生长和电极反应两种因素共同决定:腐蚀产物膜的生长会阻碍反应离子的传质效应,从而抑制腐蚀;而离子浓度的升高或传质增强会加快电极反应,促进腐蚀。 相似文献
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SOFT COMPUTING METHOD FOR PREDICTION OF CO2 CORROSION IN FLOW LINES BASED ON NEURAL NETWORK APPROACH
Ali Chamkalani Milad Arabloo Nareh'ei Reza Chamkalani Mohammad Hadi Zargari Mohammad Reza Dehestani-Ardakani Mansoor Farzam 《Chemical Engineering Communications》2013,200(6):731-747
An important aspect of corrosion prediction for oil/gas wells and pipelines is to obtain a realistic estimate of the corrosion rate. Corrosion rate prediction involves developing a predictive model that utilizes commonly available operational parameters, existing lab/field data, and theoretical models to obtain realistic assessments of corrosion rates. This study presents a new model to predict corrosion rates by using artificial neural network (ANN) systems. The values of pH, velocity, temperature, and partial pressure of the CO2 are input variables of the network and the rate of corrosion has been set as the network output. Among the 718 data sets, 503 of the data were implemented to find the best ANN structure, and 108 of the data that were not used in the development of the model were used to examine the reliability of this method. Statistical error analysis was used to evaluate the performance and the accuracy of the ANN system for predicting the rate of corrosion. It is shown that the predictions of this method are in acceptable agreement with experimental data, indicating the capability of the ANN for prediction of CO2 corrosion rate in production flow lines. 相似文献
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利用灰色GM(1,1)模型预测蒸馏装置腐蚀的宏观变化趋势,再利用时间序列模型对灰色模型的预测误差进行预测.利用灰色时间序列组合模型对蒸馏塔塔顶换热器入口分布管弯头的管壁厚度进行预测并与实际测量值进行比较,该模型比仅用灰色模型预测效果更好.最后利用灰色时序模型对弯管使用寿命进行了预测,为设备检修提供参考依据. 相似文献
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随着我国海洋油气管网的发展与建设,管道数据采集量随之增大,优秀的预测模型可以应对大量数据,准确预测管道腐蚀速率,对保障管道安全健康运行具有重大意义。将原子搜索优化算法(ASO)思想引入BP (Back propagation)神经网络,构建ASO-BP神经网络用于海底油气管道腐蚀速率的预测。以50组现场数据为例,使用Matlab进行模拟仿真计算,分别构建具有代表性的BP、GA-BP和ACO-BP模型作为对比,对海底油气管道腐蚀速率数据进行训练和预测,结果表明ASO-BP模型预测精度较高,其平均绝对百分比误差(MAPE)为3.16%,预测结果优于BP、GA-BP和ACO-BP,验证了其可靠性以及良好的预测性能,为海底管道腐蚀速率预测研究提供了新的方法和思路。 相似文献
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利用小波神经网络模型预测多相动态环境下油气集输管道腐蚀速率。首先通过室内多相动态腐蚀实验,获得了不同工况条件下的挂片腐蚀速率,用于训练和检验小波神经网络预测模型,然后利用多因子方差分析研究了温度、压力、流率、硫化氢含量、二氧化碳含量、溶解氧含量、含水率、盐含量和pH对腐蚀速率的影响程度,实现了各因素的有效性筛选,最后在确定隐含层节点数基础上通过训练、测试建立起适宜的小波神经网络预测模型,并进一步验证了模型可靠性。结果表明:除了压力外,各因素对腐蚀速率均有十分显著的影响,属于有效输入信号。当隐含层节点数为17时,8-17-1型小波神经网络结构表现出良好的准确性和稳定性。利用Levenberg Marquardt优化算法对模型进行了反复训练,直至其均方根误差小于容许收敛误差限0.001,预测值与实际值近似呈线性关系,训练、测试阶段决定系数分别为0.9992、0.9967,相关性较高,模型预测值和验证值亦不存在显著差异。因此小波神经网络预测模型对多相动态环境下油气集输管道腐蚀速率具有良好的预测能力。 相似文献