Method of Automation Control of Boiler Steam Temperature

The automation control of a boiler superheated steam temperature is considered. It is important to keep the superheated steam temperature at the given level. In case of discrepancy, the boiler operates inefficiently and emergency situations can occur. Namely, the boiler water is flooded alongside steam into a turbine set. A system of multistage cooling of boiler superheated steam through a condensate injection is described. The system of automatic control over the temperature of superheated steam for the boiler with three-tier steam cooling system is considered. A regulating algorithm rests on a cascade control method with the temperature error correction based on a force signal. The force signal is a speed of steam temperature change after the condensate injection. A mathematical model of boiler steam cooling is described. The model takes into account a nonlinear nature of the shut-off and control valves of a real boiler. The model was implemented in Simulink (Matlab) and tested on actual data of a steam boiler. The simulation results demonstrate that the method for control over the boiler superheated steam temperature has good quality characteristics, which imply effective control.