Adaptable Model of Flue-gas Oxygen-content

K. Leppäkoski, J. Mononen, and J. Kovács (Finland)

Keywords

identification, non-linear systems, combustion, power plants, flue-gas emissions

Abstract

An adaptable model of the flue-gas oxygen-content in a full-scale fluidised-bed thermal power-plant was created in order to improve control design. The model can be used to enhance oxygen-content control, thus reducing especially NOx emissions. The model structure can be either the Hammerstein-type or Wiener-type or their combination. The structure depends on fuel type and the delay in a fuel feeding system. A Hammerstein-type model structure was used in this study. The model consists of a non-linear static part followed by a linear dynamic part. Steady-state mass and energy balances were used to compute the flue-gas oxygen-content. The static part and the delay were adapted but the linear dynamics of the system, based on experimental data, was considered to be time invariant.

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