四效逆流降膜蒸发系统的建模与故障仿真  

Modeling and fault simulation of four-effect countercurrent falling film evaporator system

作　　者：胡志坤[1] 李哲彬 陈志文 桂卫华[3] 阳春华[3] 

机构地区：[1]中南大学物理与电子学院,湖南长沙410083 [2]Institute for Automatic Control and Complex Systems,University of Duisburg-Essen,Bismarckstr.81 BB,Duisburg 47057,Germany [3]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2015年第12期4504-4511,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(61273159,61105080)~~

摘　　要：针对氧化铝生产蒸发过程难以控制、故障数据难以采集的现象,根据热力学的基本原理,利用奥秘仿真系统,用高保真的模型元件通过模块化的方法建立四效逆流降膜蒸发加三级闪蒸的氧化铝生产蒸发过程模型。根据氧化铝蒸发系统的特点,将模型分为4个蒸发器模块、3个预热器模块和3个闪蒸器模块。为了体现系统的中间过程,模型中把蒸发器模块分为蒸汽单元和物料单元。通过软件中模型计算和仿真验证模型的有效性,与氧化铝蒸发过程实际测量值相比较,证明模型能够很好地反映氧化铝蒸发的动态生产过程。此外,模型还设置一些实际过程中常发生的故障。研究结果表明:通过数据分析发现故障仿真结果与理论结果相符合,为故障检测和优化控制系统奠定了基础。In real evaporation process（EVP） of alumina production, the optimal control scheme is difficult to design and the abnormal working condition data are not easy to collect. To this end, a model of the evaporation process with four-effect countercurrent falling film evaporator and three-flash evaporation was established based on the basic principles of thermodynamics. The model was realized with the mysteries simulation system. The object model was divided into 4 evaporator modules, 3 preheater modules and 3 flash modules, depending on the process characteristics. To reflect the middle process of the system, the evaporator modules were divided into steam unit and material unit. Then, the model was verified and compared to the actual measured values, proving that the model can well reflect the dynamic evaporation of alumina production process. In addition, some frequently occurring faults were also modeled. The results show that the fault simulation results are consistent with the theoretical results through data analysis. This work has a great potential for developing a benchmark for process monitoring and optimal control for EVP system.

关 键 词：蒸发过程 模块化 故障仿真 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]