On-line Dynamic Model Correction Based Fault Diagnosis in Chemical Processes

A novel fault detection and diagnosis method was proposed, using dynamic simulation to monitor chemical process and identify faults when large tracking deviations occur. It aims at parameter failures, and the parameters are updated via on-line correction. As it can predict the trend of process and determine the existence of malfunctions simultaneously, this method does not need to design problem-specific observer to estimate unmeasured state variables. Application of the proposed method is presented on one water tank and one aromatization reactor, and the results are compared with those from the traditional method.     

化工原理精馏过程的计算机辅助计算

精馏过程为化工原理教学过程中的重点和难点部分,公式多,计算过程复杂,采用传统的板书讲解方式难以达到较好的授课效果。本文利用MATLAB语言强大的运算与图形表达功能,通过剖析精馏计算过程中的典型例题,给出了计算机辅助计算精馏过程的具体思路和方法。论文中还充分展现了采用计算机进行图解法解题的优越性,从而增强教学过程的直观性和可视性,加深学生对精馏单元的理解。     

基于CFD模拟的蒸发器动态结霜研究进展

在低温高湿工况下，蒸发器容易结霜，其换热效率大幅度降低。为进一步优化蒸发器换热性能，通过文献分析综述了蒸发器结霜及CFD模拟动态结霜的研究进展。介绍了结霜机理、结霜影响因素与结霜对系统影响，同时还对数值模拟结霜过程进行总结。通过Fluent模拟动态结霜的广泛应用，为Fluent动态结霜模拟指出潜在的研究方向。