Abstract
A numerical simulation based on computational fluid dynamics and population balance model has been accomplished to analyze the gas-liquid-solid three phases in molten salt chlorination furnace. A two-way coupled model considering the influence of the bubble size distribution (BSD) on the flow field by transmitting the data of the Sauter mean diameter is firstly set up and validated with the experimental and simulation results. Based on the mechanisms of bubble coalescence and breakup induced by the turbulence and the bubble-particle interaction, some factors like the velocity field, volume fraction, turbulence dissipation rate, BSD, bubble number density and particle distribution are discussed. The results show that 40 m/s is an appropriate operation parameter for the inlet velocity of molten salt chlorination furnace, for the reason that the large bubble in the upper part of the furnace can break up into fine bubbles distributed uniformly in the whole furnace. It is conducive to the increase the interaction opportunity among phases, promote the chemical reactions, and reduce the area of “dead zone”, providing theoretical support and engineering design basis for the production of large-scale molten salt chlorination furnace.
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