加氢热高分空冷器系统流动腐蚀预测及监测管理平台开发

发布时间：2018-05-17 16:28

本文选题：空冷器系统 + 流动腐蚀　；参考：《浙江理工大学》2015年硕士论文

【摘要】：能源是社会、经济发展的基础，石油化工是我国能源工业的重要支撑。然而，随着我国原油资源的枯竭，中东高硫、高酸、含氯劣质原油进口量的逐年增加，许多石化企业的加氢装置普遍出现流动腐蚀失效引发的设备管束局部穿孔、爆管甚至爆炸、火灾等非计划停工事故，严重威胁装置和人身安全。因此，面对复杂的石化工艺关联过程，如何实现流动腐蚀预测和监测的科学管理一直是学术界和工程界关注的焦点。本文以加氢热高分空冷器系统的流动腐蚀为研究对象，，开展流动腐蚀预测及状态监测技术研究。取得的主要研究成果包括：1）基于工艺关联过程确定流动腐蚀回路，采用ASPEN软件构建工艺模型，获得多相流相态变化及腐蚀性介质分布规律，明确空冷器的流动腐蚀失效机理为多相流冲蚀；2）结合传热计算获得空冷管束内流体温度分布规律，运用CFD数值模拟获得的剪切应力表征空冷器管束冲蚀失效的危险区域，并根据远场涡流检测结果验证了冲蚀预测方法的准确性；3）基于多相流冲蚀预测结果，构建基于冲蚀失效模式的空冷器系统防控体系，建立包括流速、NH4HS浓度、H2S分压、pH值和Cl-含量等流动腐蚀防控参数群的软测量模型，确定防控参数的控制指标及超标后的监管措施；4）以流动腐蚀防控体系为基础，基于C/S模式开发空冷器系统流动腐蚀监管平台，实现DCS系统、LIMS系统的远程基础工况数据的实时采集；通过自动控制服务器实现应用程序与ASPEN模型交互，计算腐蚀防控参数实时值，并与控制指标对比评价空冷器系统腐蚀状态，对超标参数进行声光报警并给出处理措施。现场应用结果表明，开发的监测管理平台可实现流动腐蚀状态在线实时监管，降低空冷器系统流动腐蚀风险，提高设备系统的优化运行水平，保障装置安全、稳定、长周期运行。本文创新性包括：1）基于工艺仿真、传热计算及流动数值模拟构建流动腐蚀失效预测模型，明确空冷器系统的多相流冲蚀机理及危险区域；2）基于流动腐蚀预测，确定空冷器系统流动腐蚀防控参数群，并通过数理建模实现腐蚀防控参数的软测量；3）利用.NET Remoting技术开发基于C/S模式的流动腐蚀状态监测管理平台，通过生产过程数据监测与管理信息系统交互，实现空冷器系统流动腐蚀状态在线实时监测管理。
[Abstract]:Energy is the foundation of social and economic development, petrochemical industry is an important support of energy industry in China. However, with the depletion of crude oil resources in China and the increasing import of crude oil with high sulfur, high acid and chlorine content in the Middle East, a local perforation of the equipment bundle caused by the failure of flow corrosion occurs in many hydrogenation plants in petrochemical enterprises. Pipe-burst, even explosion, fire and other unplanned stoppage accidents, a serious threat to device and personal safety. Therefore, in the face of complex petrochemical process correlation process, how to realize the scientific management of flow corrosion prediction and monitoring has always been the focus of academic and engineering circles. In this paper, the flow corrosion prediction and condition monitoring technology of the hydrothermal high score air cooler system are studied. The main research results obtained include: (1) the flow corrosion loop is determined based on the process correlation process, the process model is constructed by using ASPEN software, and the phase change and corrosive medium distribution law of multiphase flow are obtained. It is clear that the failure mechanism of flow corrosion of air cooler is multiphase flow erosion) combined with heat transfer calculation, the fluid temperature distribution in air cooled tube bundle is obtained. The shear stress obtained by CFD numerical simulation is used to characterize the dangerous zone of erosion failure of air cooler tube bundle. According to the results of far field eddy current testing, the accuracy of the erosion prediction method is verified. Based on the erosion prediction results of multiphase flow, the air cooler system control system based on erosion failure mode is constructed. A soft sensor model of flow corrosion control parameter group including flow rate NH 4HS concentration, H 2S partial pressure, pH value and Cl- content is established, and the control index of the control parameters and the supervision measures after exceeding the standard are determined) based on the flow corrosion prevention and control system. Based on C / S mode, the air cooler system flow corrosion monitoring platform is developed to realize the real-time data acquisition of the remote basic working condition of DCS system, and to realize the interaction between the application program and the ASPEN model through the automatic control server. The real-time value of corrosion prevention and control parameters is calculated and compared with the control index to evaluate the corrosion status of air cooler system. The acousto-optic alarm for the parameters exceeding the standard is given and the treatment measures are given. Field application results show that the developed monitoring and management platform can realize on-line real-time supervision of flow corrosion status, reduce the risk of flow corrosion in air cooler system, improve the optimal operation level of the equipment system, and ensure the safety and stability of the device. Long period operation. The innovations of this paper include: (1) based on process simulation, heat transfer calculation and flow numerical simulation, the failure prediction model of flow corrosion is constructed, and the mechanism of multiphase flow erosion of air cooler system and danger zone are clarified. Determine the flow corrosion prevention and control parameter group of air cooler system, and realize the soft sensing of corrosion prevention and control parameter by mathematical modeling. Using. Net Remoting technology to develop flow corrosion monitoring and management platform based on C / S mode. Through the interaction between production process data monitoring and management information system, on-line real-time monitoring and management of flow corrosion status of air cooler system is realized.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE986

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