Analysis On Operation Characteristics And Modeling Of 450t/h Circulating Fluidized Bed Boiler

On the basis of operation data of two 450t/h commercial CFB boilers, the author has made a study of CFB boiler. The numerical values, distribution laws and change laws of temperature and pressure in the circulating loop are studied. The change laws of fuel supply, primary air, secondary air, oxygen concentration, main steam parameters, attemperating water, and exhaust gas temperature at different operating conditions are also presented. Furthermore, in operation the main faults and solutions are also discussed. Through the method of neural network, the author develops the model of bed temperature which can reflect the dynamic change laws of bed temperature of large-scale CFB boiler. Developing the model, the author thinks that Fuel supply and primary air have dominate effect on bed temperature. To reflect dynamic characteristics of bed temperature, the inputs of neural network are expanded by adding the historical data of fuel supply, primary air and bed temperature.