Mathematical modelling of biomass fired fluidized bed boiler

The paper presents a mathematical model, results of calculations and energetic characteristic of biomass fired recirculating flue gas fluidized bed boiler. Methodology of calculation and mass and energy balances were worked out according to standards PN-EN 12953 - 15 and DIN 1942. In order to develop mass and energy balances, compositions of flue gas were used. These equations create a non-linear set of equations which should be solved with the help of iterative procedure. Numerical calculations were performed using results of measurements of biomass fired fluidized bed boiler OFz-201. In next step, obtained results of thermal calculations were used to develop energetic characteristic which, take under consideration, the influence of operating conditions on energetic efficiency of boiler. Identification of model was carried out using regression methodology.