The Numerical Simulation Of Gas-Solid Flow And Combustion In Chamber Of Four Wall Tangentially Fired

China is the only big country taking coal as main energy in the world. The burn of coal is the ecological heavy pollution sources of environmental disruption. At present control the pollutant (such as NOX, SO2 ,etc.) of coal mainly proceeds with three ways: First way is to improve the burn, second way is to take off the nitrogen fuel( sulphur), The third kind of way is to purify the exhaust gas. Because the last two methods have heavy difficulty and high costs. Present effective way is to improve the burn, The main content of this text is to set up rational mathematics model about burning firstly, And then analyses the turbulence flow velocity field, temperature field and density field with numerical simulation method, At last is to contact with the test data and prove the rationality of the model.Through computer numerical simulation, This text carried on computational analysis about velocity field, temperature field, density field and the trajectory of the particles in the chamber of Four-wall Tangential Circle .Author of this text according to upper and lower structure characteristic of the burner and the flow, divided the area of burning with mesh system that keeps parallel with the air flow of the entry .The mesh system can reduce false diffusion As to the gas phase flow field, author of this text chooses k-e equation model . The form of k - ?equation model relatively simple, needs little CPU time and it can reflect flow characteristic better of burner, Had made more rational velocity field.Adopt the track model of particle on simulating trajectory of the particles of the two phase flow. Merit of the model is it can save computer memory and compute time (especially the confirm track model), Can simulate the discrete phase that have complicated experience (for example evaporate, volatilize), this model deals with the discrete phase with Lagrange method because this method can reduce false diffusion. This text deals with the turbulentdiffusion with stochastic tracking approach.The text deals with gas burn with probability density function of fast reaction. I adopt the two competing rates model to deal with the released rate of the volatiles. After the volatile component of the particle is completely evolved, a surface reaction begins. Which consume the combustion fraction. This text deals with the surface reaction rate of combusting particles with the kinetics/diffusion-limited rate model. Compare the calculate results with results of the test, prove that the models of above are suitable on the whole.