Abstract
This paper presented a method for optimization of boiler start-up process based on fuzzy reasoning and process simulation. The boiler parameters are calculated by the simulation program of boiler start-up process, and the drum stress and fatigue life are analysed according to the ASME Boiler and Pressure Vessel Code. The fuzzy relationship between the firing rate and the drum stress is established, and the fuzzy reasoning rules are instituted. The firing rate curve and the pressure-raising curve of the start-up process are optimized by fuzzy reasoning. Using this method, the start-up process of a 600MW boiler from the time of boiler light-off to the time of turbine rolling is optimized. The results show that using the optimized starting curves the start-up time can be reduced greatly without increasing the loss of drum life. Simultaneity, the optimum firing rate and pressure-raising curve provided by the method can help the operators of power plant regulate the start-up process conveniently and intuitively.
