A System Dynamics Model of Fire-Tube Shell Boiler

[+] Author and Article Information
B. J. Huang, P. Y. Ko

Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10764

J. Dyn. Sys., Meas., Control 116(4), 745-754 (Dec 01, 1994) (10 pages) doi:10.1115/1.2899274 History: Received December 04, 1988; Online March 17, 2008


A system dynamics model of fire-tube shell boiler was developed. The derivation of the dynamics model started with a nonlinear time-variant dynamic modeling based on the transport phenomena in the fire-tube boiler. A linear time-invariant perturbed model around steady-state operating points was then derived. The identifiable parameters τmw , τwa , K, β, and τd were identified by using field test data and least-squares estimation method; the coefficients C’s were, meanwhile, directly predicted by using the small-perturbation relations. Empirical correlations of the identifiable parameters were further derived to account for the variation of parameters with operating conditions. The present perturbed model is thus semi-empirical and can describe the dynamic behaviour of fire-tube boilers over a wide range of operating conditions. The predictions of dynamic responses using the present model were shown to agree very well with the test results.

Copyright © 1994 by The American Society of Mechanical Engineers
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