受网络夹点控制的装置的改造分析

本文分析了过程夹点和网络夹点的不同，指出了在改造过程中存在网络夹点，并且节能潜力受网络夹点的控制，同时提出了克服网络夹点的途径，即分流和调整换热网络结构。通过对某炼油厂润滑油加氢补充精制装置的分析。提出了不分流时克服网络夹点的方法，即同一温闰的冷流体按热溶流率CP值减小依次被加热；同一温位的热流体按CP值减小依次被冷却。最后，文章对该装置提出了采用“一改动方案”的改造方案，节能效果和经济效益显著。

Analysis of Retrofitting the Process Controlled by Network Pinch

The gas-solid fluidized bed is a complex system which involves many dynamic parameters and disturbance of noises, so it is difficult to obtain the weak embedded information from single time series. Based on the concept of information entropy and mutual information in Shannon information theory, the information transport rate is defined to investigate the dependence between pressure fluctuation time series in the reconstruction phase space at two different positions in the fluidized bed. A new function of information transfer rate (ITR) is defined on the base of the concepts of information entropy and mutual information entropy. Some curves of the information entropy and the ITR changing with the operating conditions are given. Basing on the results of the ITR between the measured time series at dual different probes, the authors argue that information is transferred upwards and downwards with a high propagation velocity through the disturbance of particles in fluidized beds. The average information transfer velocity decreases with the increasing of gas superficial velocity.