Reaearch And Realization Of Intelligent Fermentation Process Supervisory And Control

Fermentation is the growth and chemical changes in the micro-organisms training process,producing a lot of fermentation product by the growth in the culture.Modern industry,agriculture,medicine and food industries,etc,need a large numbers of experiments of fermentation process.In order to achieve the particular purpose of these processes,strict monitoring and controlling must be carried for specific parameters such as temperature,pH,O₂ and CO₂.Traditional methods used are mainly manual/semi-manual according to personal experiences which are low accuracy and less effective.With the expansion of Fermentation scale and the needs of industrial development,there is an increasing need for more effect controlling and monitoring,intelligent distributed control mode has become the direction of the fermentation control.At present,this kind of research in our country is still in the exploratory stage. Chinese scholars are mainly restricted to the study of individual parameters controls and the original model research,lacking an overall perspective and practical research, let alone practical software.This article comes from the author's work in the National Ministry of Science and Technology supported project"intelligent fermentation equipment technology research and industrialization"(No: 0C26213201195).Firstly,being a popular means of modern statistical analysis in the field of industrial control,linear regression method is widely used.linear regression equation was derived and have been successfully used in the temperature analysis and control of fermenting.Compared with the original simple sub-control mode,the control accuracy of linear regression method has been greatly improved.Secondly,we proposed an improved MODBUS protocol,a-MODBUS protocol. This protocol optimizes the feedback message of standard MODBUS and could distinguish the different tasks through feedback messages.This improves the shortages of standard MODBUS that is unsuitable for multi-taskasynchronous management in distributed manages.Thirdly,a kind of hierarchical resources management strategy in open SCADA system is proposed,bandwidth allocation and CPU utilization are mainly discussed. The traditional SCADA systems are usually designed for closed environment using:the input data and resourse availability are known at prior and are subject to little change.There are an increasing demands for SCADA systems to be adaptive to open environments where the input data and resources are changeable.Fourthly,a detailed introduction of the OPC technology and the latest achievements is given.OPC has changed the means of integration and control,we used OPC to create an open,interoperable control systems and had greatly reduced the SCADA system development and integration costs.Finally,on the basis of above study,we develop a complete SCADA system for monitoring of fermentation process.The SCADA system runs in upper computers and controls the system with lower computers.The hardwares environment can be PPI cable and industry Ethernet.The main features include real-time data acquisition and control,data communication,data analysis and system maintenance,etc.