Abstract
Abstract This paper describes multi-level control and optimization techniques for desalination plants for improved product quality, productivity, and minimum cost of operation. Methods of implementation by distributed process controls are also discussed. Specifically, the conservation of energy and materials, minimization of equipment outages, and increase production rate are primary goals to be achieved. A dual-purpose combined-cycle power generation and distilled water production plant is considered. The power generation portion consists of multiple co-generation units, consisting of gas turbine generators, waste heat boilers, and steam turbines. The desalination portion operates on the distillation principle having multiple trains of multi-flash evaporators with recycling capability. In addition, a vapor compression cycle in evaporative distillation is included to describe the opportunities in this type of desalination. A multi-level control system is considered in three levels: (i) dedicated sequential and regulatory controls; (ii) supervisory and optimizing controls; (iii) management information and control.
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