The Application And Research Of Alkali Reclaim System In Paper Mills Based Expert Control System

With the development of our national industry and the incessant improvement of people's living standard, the scale of China's paper industry are getting more and more extensive. But followed with this, the amount of water consumption in paper making are getting huger. Waste liquor are being produced and discharged irresponsible. So the water pollution is getting worse and worse.All these hold back the development of economy and the progress of the society in our country. And moreover, it has become a serious threat to human living space.That waste liquor in paper mill are treated effective and discharged water quality meets the national standards is became a critical task in recycling economy as well as in scientific development in our country.According to the alkali reclaim system process feature, by the research and analysis in alkali recovery control system, an auto alkali recovery control system is designed.The system not only treats waste water but also recoveries the residual alkali in black liquor, and it can be reutilization in paper making process.The auto system is consisted of intelligent controller and monitor instrument in field, data acquisition, processing, and control algorithm is researched in hardware and software design process.The management software in monitor center is designed by using supervisory control and data acquisition software. In the process, the anti-jamming measure is taken count in and so that the stability and reliability can be guaranteed.In the alkali reclaim system, black liquor level vary tendency has the quality of nonlinearity, time-varying volatility and no determinacy. By combining PID control theory and expert control theory, the expert PID control system is designed. By the control system adjusting, black liquor level can be controlled steady and system equipment will work well.Alkali reclaim auto control system can monitor and control the remote equipment, get running date from remote equipment, and manage these data.After using this black liquor treating control system, black liquor level are controlled well and the energy and equipment consumption in treating black liquor can be further reduced. The system gets significant economic benefits and social benefits. It has constructed a well foundation to fulfill a future automatic system in paper mill.