The Research And Development Of The Automatic Control System Of Bromine Production Precess

Bromine is the first element isolated from seawater,it has been widely used in various fields currently.In China,coastal bromine manufacturers use air blowing method to extract bromine from seawater.But it exists a series of questions.for example:low level of automation,high consumption of raw materials,unstable product quality.Traditional methods need to improve automation level,to ensure safety in production,improve production efficiency and production.According to the requirements of process control and environmental characteristics,and considering the I/O points,this paper builds an automatic monitoring system platform based on Industrial Ethernet,fieldbus technology and other network system.Through the full understanding of the entire process and control requirements of bromine production,the project complete automation solutions and design of the entire system..The control system using the method of DCS.The Distributed Conutrol System include a S7-300CPU,as the main station and double CPU software redundancy.Most of the variables of detection and control process are completed by the master.Via the Profibus-DP bus,the S7-300 master is connected to the three sub control station,which is responsible for the bittern pump frequency converter station,sulphur burning station and weighing the alarm data collection and control station.In the monitoring system platform,in view of blowing out with acid,this paper uses the integral separation PID to add acid with the PH value automaticly.In view of blowing out with chlorine,this paper uses fuzzy self-adjust PID to add chlorine with ORP value.As the bromine ingredients are difficult to measure online,here uses image analysis technology,this paper uses cascade ratio control.Control procedures are programmed using SIEMENS STEP7V5.5 software.Monitor screens are made through the PC configuration software KingView6.55.The main monitor screen includes process of production,historical and real-time data,system alarm query,print data in a report,etc.The system realizes the automatic control of key variables to blow out and distillation.It greatly improved product quality of bromine,reduced labor intensity,ensuring personal and equipment safety.Also,with simple system operation,the level of the automatic control is highly im roved,obtaining obvious economic benefit and social benefit.