Study On Integrated Optimal Control System For Aluminum Powder Nitrogen Atomizing & Classifying Process

For the nitrogen atomizing technology is characterized by higher fine powder proportion, the reactive feature of aluminum powder, higher spherical shaped proportion of aluminum powder, safer producing process and many other advantages, the production technics has been widely adopted by many aluminum powder enterprises. The process of aluminum powder nitrogen atomizing and classifying is a complex industrial process. It includes many physical and chemical reactions and some dynamics processes, and it has characteristics of strong nonlinear, strong coupling, large lag, uncertainty and so on. The melted aluminum's temperature in the atomization furnace is the key control variable of the atomizing process, which has a great effect on the fine powder proportion and the production of the aluminum powder. This temperature cannot be controlled well by the conventional control methods. As the production quality index, the distribution of the particle size of the aluminum powder cannot be measured directly, and it brings great difficulties to the process modeling and control optimization. At present, for the aluminum powder nitrogen atomizing and classifying process control technology is outdated and the level of automation is low, the optimal control technology turns into the important method of improving aluminum power quality. In this paper, by taking the reconstruction of the aluminum powder production lines in High Alcohol Plant of CNPC Jilin Chemical Group as the backdrop, the mechanism of the aluminum powder nitrogen atomizing and classifying processes is analyzed comparatively and deeply. The author proposes the aluminum powder nitrogen atomizing and classifying process intelligent integrated optimal control system for the first time, and has put it into use successfully. The content of the research in this paper is as follows:1. Based on the analysis of the mechanics of the aluminum powder nitrogen atomizing process and the technological characteristics, taking aluminum powder particle size distribution as the optimal control objective, the project of the integrated optimal control system of the aluminum powder nitrogen atomizing and classifying process are proposed. In this project, the 3-layer distributed control system is presented by assembling PLC, industrial PC, field bus I/O modules and the industrial ethernet, and realizes the integrated optimal control of the aluminum powder nitrogen atomizing and classifying process. The application of this integrated optimal control system guarantees safe operation of aluminum powder...