Realisation of Optimum Main Steam Temperature Control in Gas Fired Utility Boiler by Combined Usage of Feedback, Cascade, Multiple Iterative Feedforward and Iterative Learning Control

Abstract

The paper explores cost effective technique to achieve optimum main steam temperature control of a Gas Fired Utility Boiler of Power Plant or Ethylene Cracker Unit by implementation of combination cascade, multiple iterative feed forward control and iterative learning control. The paper shows how by using of said control technique the difficulties of conventational control technique i.e. Feedback and Cascade can be overcomed without addition any extra hardware or cost. The paper outlines complete implementation technique of proposed control specification in modern day DCS(Distributed Control System) from selection of variables to algorithm. At the same time the paper provides datas and trends of practical application of the control technique in a gas fired 80TPH utility boiler for the better understanding. The next section of the paper deals with advantages of this technique with conventional control algorithm.