Design And Implementation Of Automatic Load Control System For Air Separation Unit

Air separation unit at home and abroad increasingly towards large-scale and diversification, foreign large-scale air separation plant basically realized the automatic variable load, while domestic air separation plant load change based on the experience is still groping, a lack of theoretical support, mostly conventional control-oriented, the implementation of variable load manual rule of thumb, on the one hand to the operator to increase the labor intensity, the existence of misuse to the production has security implications, on the other hand as variable load parameters to adjust more, manual operation is likely to cause fluctuations in conditions affect the stable operation of the air separation unit.Oxygen for the domestic iron and steel enterprises and users with a continuous production of oxygen is not balanced condition, based on relocation of Shougang Steel Co., Ltd.35000Nm3/h air separation plant for the prototype, the characteristics of technology and equipment from the proposed automatic load control principle and strategies to multi-stage distillation column model, from the material balance, energy balance, equilibrium starting to determine the course of the implementation of an automatic load control of the important parameters in the relationship between the function of the mathematical model, the CENTUM CS3000 distributed control system control functions provided by the software configuration design of various important parameters of the control loop and control chart and process design of the automatic load monitoring and alarm functions, enabling the air separation unit automatic load process of a smooth, safe, and economic operation.Practice has proved that this set of equipment through an automatic load control system implementation, to achieve the air separation plants range between 75%-105% of the variable load capacity, greatly reducing the oxygen elution rate, lower product costs, with to good economic returns, while reducing the amount of labor intensity and improve the automation level of the air separation unit.