Degrees of Freedom Analysis of Economic Dynamic Optimal Plantwide Operation
نویسندگان
چکیده
Improving the operation is an attractive option for the process industry to deal with increased competition. In this paper a general dynamic optimization framework is proposed that aims to improve plantwide operation in an economic sense. The term general means that it is based on dynamic operation in which any operational constraints can be accommodated. One would expect economic optimization to utilize all available degrees of freedom. However it is shown that this is normally not the case, so this leaves the possibility open to do further optimization. Copyright © 2007 IFAC
منابع مشابه
Economic Plantwide Control of the Cumene Process
Economic plantwide control of the cumene process over a large throughput range (design to maximum achievable throughput) is studied. The process has 12 steady state operating degrees of freedom (DOFs), which are optimized for maximum hourly profit. At maximum throughput, the highest number of constraints (eight) is active leaving four unconstrained degrees of freedom. Reasonable controlled vari...
متن کاملSteady-State Operational Degrees of Freedom with Application to Refrigeration Cycles
An important issue for optimal operation and plantwide control is to find the degrees of freedom available for optimal operation. A previously published systematic approach to determine the steady state degrees of freedom is expanded to take into account the active charge as a possible degree of freedom in cyclic processes. Additional degrees of freedom related to the composition of the circula...
متن کاملOptimal Operation of a Three-Product Dividing-Wall Column with Self-Optimizing Control Structure Design
This paper deals with optimal operation of a three-product Dividing-Wall Column (DWC). The main idea is to design a control structure, through a systematic procedure for plantwide control, with an objective to achieve desired product purities with the minimum use of energy. Exact local method is used to find the best controlled variables as single measurement or combination of measurements ...
متن کاملEconomic Plantwide Control Over a Wide Throughput Range: A Systematic Design Procedure
A systematic top-down procedure to design an effective plantwide control system for economically (near) optimum process operation over a wide throughput range is developed. The proposed procedure focuses on devising a control system for optimal operation at maximum throughput, where usually the highest number of constraints is active and the economic benefits of improved operation are the great...
متن کاملPlantwide Control for Economic Operation of a Recycle Process
Plant-wide control system design for economically optimum operation of a recycle process with side reaction is studied. The process consists of a liquid phase CSTR followed by two simple distillation columns. The exothermic irreversible reactions A + B → C (main reaction) and C + B → D (side reaction) occur in the CSTR. The reactor effluent is distilled in the recycle column to recycle the ligh...
متن کامل