Numerical Simulation Of Flow And Combustion In The 600MW Supercritical Pressure Boiler

Ultra- and supercritical coal-burning technology is becoming the most advanced technology at the present time because of high efficiency, low emission, easy load regulation, steady operation. The supercritical pressure boiler has its own characters. Now the research about this field is few, which blocks the development of the supercritical pressure boiler.The paper first introduced the importance of development of the supercritical pressure boiler and research status of numerical simulation in the furnace. Chapter 2 introduced numerical models and calculation methods which the paper employed. The RNG k-εmodel was used for simulation of gas flow. The stochastic tracking model was used in tracing the coal particles. The discrete transfer method was used for radiation. The two competing rates model was used for volatilization. The equations of the mixture fraction were used for the volatile's combustion. The diffusion dynamic model was used for the char combustion. The model developed by De'Soete is used for the fuel NOX calculation, and the model developed by Zeldovich is used for the the thermal NOX calculation. The simpler method was used for resolution of difference equations.Then chapter 3 introduced 600MW supercritical pressure boiler and mesh, also boundary conditions. In the next chapter 4, though calculations and analysis, some results are got: (1) the flow field,temperature field,component field in furnace when the boiler runs at 100% BMCR load; (2) the influences of swirling intensity of out secondary wind on the flow field,temperature field,component field; (3) the influences of excess air coefficient on the flow field,temperature field,component field; (4) the influences of ratio of over-fire air in secondary wind on the flow field,temperature field,component field; (5) the influences of coal fineness on the flow field,temperature field,component field. The research results are worthful for optimal operation for power plant and can be used to provide references and useful guide.