Analysis of steam drum level control schemes for an 80,000 pph industrialized boiler model

Author

Kenneth E. Swayne

Date of Award

8-1992

Degree Type

Thesis

Degree Name

Master of Science

Major

Electrical Engineering

Major Professor

James C. Hung

Committee Members

Frederick Symonds, Joseph Googe

Abstract

Over the past 28 years, the chemical process defined in this paper has traditionally used a thermostatic regulator for steam drum level control. The plant steam load is cyclic in nature which has caused level variations of ±4 inches, as determined by high and low alarm positions.

To resolve the poor control performance of the mechanical device, three types of improved control schemes were investigated, namely, feedback, feedforward-feedback, and Smith-Predictor model designs. The problem solving technique involved model development from field data, controller design, and computer simulation of the controllers. A comparison of the simulated controller performance was used to determine the design appropriate for field application.

The feedforward-feedback design was chosen to replace the mechanical system. The controller demonstrated fast response and tight control. The level variation improved to ±1 inch during load upsets.

Recommended Citation

Swayne, Kenneth E., "Analysis of steam drum level control schemes for an 80,000 pph industrialized boiler model. " Master's Thesis, University of Tennessee, 1992.
https://trace.tennessee.edu/utk_gradthes/12293