Control Structure Design for Oxy-Fired Circulating Fluidized Bed Boilers Using Self-Optimizing Control and Partial Relative Gain Analyses

Partial Relative Gain: A New Tool for Control Structure Selection

A new procedure for analysis and selection of control structures is presented. In addition to the relative gain array (RGA) for the entire openloop system, the RGA for the system under partial control is considered. This partial relative gain (PRG) provides necessary conditions for a control con guration to be integral controllable with integrity. The PRG also solves the variable pairing proble...

Control of a Fluidized Bed Polyethylene Reactor

In present paper, dynamic behavior and control of a fluidized bed reactor for polyethylene production has been considered. A double active sites model for Ziegler-Natta catalysts is used for simulation of polymerization reaction. Hydrodynamic behavior of the bed is modeled using a two phase model including bubble and emulsion phases in which bubble phase has plug flow pattern with different...

Foam Control Using a Fluidized Bed

Spray Flow Design for Once-through Circulating Fluidized Bed Boiler Control

The present work examines the distribution of spray water in the superheating section for steam temperature control in a once-through circulating fluidized bed (OTU-CFB) boiler. Combustion power generation has become challenging due to increasingly fast load change demands. There is also a constant need to improve power plant efficiency, which leads to extreme operating conditions and complicat...

Optimal 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 ...