Fuzzy modelling of combustion efficiency and control of excess air flow case study: 320-MW steam unit/Isfahan Power Plant/Iran

Abstract One of the most critical factors affecting boiler efficiency and hazardous-gas-emission reduction is volume excess air mixed with fuel. A knowledge-based approach proposed to model a 320-MW natural-gas-fired steam power plant in Isfahan, Iran by applying fuzzy-modelling techniques control efficiency. This based on fuel entering boiler. First, fuzzy-model structure identified fuzzy rules obtained from an experienced human operator. The method then optimized using genetic algorithm increase accuracy. results indicate that, algorithm, precision increases. error between actual output low. developed modelling-related calculations. Finally, optimize boiler, proportional-integral controller designed. closed-loop simulations are run both manual demonstrate influence suggested method. simulation outcomes that recommended adjusts excess-air percentage correctly increases unit 0.70%, significantly reducing consumption.