Study on Gas-solid Flow Characteristic in Slag Cooler of Circulating-fluidized Bed Boiler

摘要

In order to test the predicting ability of numerical calculating and provide the reliable data for the successive design, this study was designed to trace the particle path in the complete fluidized flow field in the slag cooler according to the characteristic of the gas-solid flow by the Euler-Lagrange model of FLUENT software and the continuous phase and particle phase coupling algorithm. The study focused on the movements of particles in different diameter in the cooler, the interaction of the two-phase flow, the influence of the cooler internal structure on the particle track, and the velocity changing laws of the particles in every directions. The representative results was comparied with the practice. The results showed that the slag cooler had higher efficiency with unequal wind, the outflow had highest velocity at outlet when the entire flow field is uniform flow, the turbulence energy of the flow field changed obviously, the turbulence near the division wall was advantage to the particle roll over the wall, which was help for separating slags, and the slag cooler was inefficiency if the velocity of slag is too high. The model full reflected the gas-solid flow characteristic in the slag cooler.