MODEL-BASED CONTROL AND OPTIMUM OPERATION OF HEAT EXCHANGERS

摘要

Heat exchangers are important equipment to realize certain process requirements. Strict process requirement ensures objective fluid with shortest dynamic adjustment time and with minimum controlled variable wave. The common control method in industry heat exchanger, by-pass control on the base of feedback can not produce high control quality because of time delay and over-adjustment. So a new method---model-based control is presented here to overcome above shortage and realize heat exchanger "zero defect" operation. Optimum operation predicted algorithm is also put forward to make heat exchanger run at minimum energy cost by adjusting operating condition. A new mathematics model is presented here, considering the fluid dispersion and wall conduction, and the analytical solution of transient response is obtained by means of Laplace transform and FFT algorithm. Then the experiment is done to compare model-based control and by-pass control method.