Development Of Simulation Modeling For 1025t/h CFB

In order to depress the pollution, more and more environment factors should be concerned in power plant. Circulating Fluidised Bed(CFB) boiler has been widely used in the world, because of the characteristics of fuel flexibility, high combustion efficiency and low pollution emissions. And now CFB is heading for the large-scale. But, the capacities of most CFBs which are running now are small. Since we know little about the design technology and the dynamic character of the large CFB, it is one of the obstacles in the development of CFB. So, it's necessary to know more about the running character of the large-scale CFB. It has been proved that the computer simulation is an easy and fast way to know the dynamic character of the large CFB on the base of practical experiment.In this dissertation, the main works as follow are completed.1) Based on the analyses of the characters of the gas and solid flowing, the flowing models have been developed.2) The distribution character of the thermal parameter is also considered by the cell model in the direction of axial and the core-annulus structure in the direction of radial.3) Based on the analyses of the volatile releasing and combusting, the coke combusting, the formation and reducing of the pollution, the combustion model has been developed.4) The heat transfer model has been developed, based on the principles of radiation and convection in furnace.5) A simulating model was developed by the method of object-oriented module.6) Several simulation experiments were made to test the dynamic characteristics for a 1025t/h CFB.The correction of the mode was verified by the simulation experiments. The simulation model provided an easy and fast experimenting method for designing and operating of CFB.