Abstract
The development and use of a nonlinear dynamical mathematical model of a four-fuel steam boiler combustion control system are described. The 140 ton/h drum boiler can burn four fuels simultaneously. The combustion control system includes the fuel control system and the air control system. A 13th order combustion control system model was developed to study the plant combustion control system behavior in normal operating conditions. The model was developed and validated using actual power plant data. The simulation revealed the need for important modifications in both fuel and air control systems. The modifications, after being tested in the model, were proposed to the plant personnel and some of them have been successfully implemented in the actual plant. A reduced-order SISO linear model was developed for the fuel control system. The linearized model helps tune the fuel control system global controller and runs five times faster than the nonlinear one.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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