NUMERICAL-SIMULATION AND VERIFICATION OF A GAS-SOLID JET FLUIDIZED-BED

From the Navier-Stokes equations and the Newtonian equations, which de scribe gas flow and the movement of a single particle respectively, a two-phase model describing gas-solid flow macroscopically in fluidized beds was derived by using volume averaging and the parameters of the model were determined. This general model can be reduced to several fo rms of simpler models reported in the literature. An improved interpha se slip algorithm (IPSA) method based on finite volume approach was us ed in the solution of the model equations. The influences of the veloc ity of the central jet, height of the bed and superficial gas velocity in the bed on jet penetration height were obtained by numerical simul ation. The computed flow patterns of the binary mixture were also obta ined. The theoretical prediction was verified against the experiments made on a two-dimensional jet fluidized bed with both unitary and bina ry component materials. Under the operating conditions of an industria l ash-agglomerating coal gasifier, the arithmetical mean based upon pa rticle number was introduced to calculate the mean diameter of the bin ary components. Thus the simulation of the binary components was simpl ified. All the computed jet penetration heights under various conditio ns were in good agreement with experimental and literature data.