摘要
A systematic approach for the steady-state operation analysis of chemical processes is pro-posed.The method affords the possibility of taking operation resilience into consideration during thestage of process design.It may serve the designer as an efficient means for the initial screening ofalternative design schemes.An ideal heat integrated distillation column(HIDiC),without any reboileror condenser attached,is studied throughout this work.It has been found that among the various va-riables concerned with the ideal HIDiC,feed thermal condition appears to be the only factor exertingsignificant influences on the interaction between the top and the bottom control loops.Maximuminteraction is expected when the feed thermal condition approaches 0.5.Total number of stages andheat transfer rate are essential to the system ability of disturbance rejection.Therefore,more stagesand higher heat transfer rate ought to be preferred.But,too many stages and higher heat transfer ratemay increase the load of the
A systematic approach for the steady-state operation analysis of chemical processes is proposed. The method affords the possibility of taking operation resilience into consideration during the stage of process design. It may serve the designer as an efficient means for the initial screening of alternative design schemes. An ideal heat integrated distillation column (HIDiC) , without any reboiler or condenser attached, is studied throughout this work. It has been found that among the various variables concerned with the ideal HIDiC, feed thermal condition appears to be the only factor exerting significant influences on the interaction between the top and the bottom control loops. Maximum interaction is expected when the feed thermal condition approaches 0.5. Total number of stages and heat transfer rate are essential to the system ability of disturbance rejection. Therefore, more stages and higher heat transfer rate ought to be preferred. But, too many stages and higher heat transfer rate may increase the load of the compressor, and hence a trade-off between system resilience and energy saving has to be taken care of. Much strong interaction would be expected for the ideal HIDiC because of the high degree of structure symmetry between the rectifying and the stripping sections. However, it could still be possible to operate it smoothly with decentralized PI controllers.
