Design of hierarchical computer control systems for industrial plant. Part 2: Development of hierarchical controls for a multiple-effect evaporator

A generalised control algorithm is developed for application to industrial processes. The algorithm can cater for multivariable interactions, time delays and environmental disturbances. It is proposed as a fundamental building block for the development of hierarchical control schemes. The algorithm is a feature of a c.a.d. facility for the modelling, design and implementation of hierarchical computer controls. The facility incorporates interactive graphics as a major design aid. Application to a multiple-effect evaporator is described. It is demonstrated that the techniques have realistic potential for useful practical application.