Study On Automation Control Of Batch Sugar Boiling Process

The process of sugar production consists mainly of sugarcane crushing, purification, evaporation, crystallization (sugar boiling). The purpose of sugar boiling is to recover as much sugar from the syrup as possible, in the meantime, the size of the crystal should be as uniform as possible. Therefore, the result of sugar boiling draw a decisive influence on the quality and quantity of the production. At present, all the process of sugar production have realize the automation except sugar boiling that operated by experienced operators using skill and past judgement to obtain satisfactory result There are two main reasons. Firstly, there is no way to directly measure the main parameter online so far. Secondly, too many disturbances exist in the sugar production process. For example,the Brix,impurity,vacuum pressure and temperature of syrup all have influence with the sugar production process.The aim of this research is to realize the automation control for batch sugar boiling which is based on practical industry production process. Firstly, to measure the sugar consistence exactly with the advanced R-F probe.and control the consistence with computer. Take the industry computer as control platform, ADAM-5510M as the center, matches by the high performance measuring meter, uses the intelligent control technology, uses RS-485 as the means of communication, to realize the automated control of sugar boiling.Secondly, to efficiently retain the sugar production and improve the quality of sugar, the new technology and new control arithmetic must be investigated. The sugar crystal process control system has the characteristics of nonlinearity, time-variation, and uncertainty. As the fuzzy control dose not require to build the controlled object's precise math model and the PID control has very high precision, so we put forward a kind of PID parameter fuzzy self-adjusting algorithm, which combines the PID control and the fuzzy control.The Fuzzy-PID controller that is based on the reality could improve the crystal rate and shorten the crystal time and save energy sources.From the theory, it is feasible to achieve the automation of sugar crystal process by employing the intelligence control technology.