An Experimental And Numerical Study Of The Gas-Solid Flow Characteristics In The Circulating Fluidized Bed Desulfurizer Reactor

The gas-solid flow characteristic in the circulating fluidized bed (CFB) riser is the key of the CFB flue gas desulfurization technology, so it is very important of exact experimental testing and setting a general mathematical model. Profound studying the distribution and axial development of local particle concentration in riser, it is valuable for understanding gas-solid mixture in the riser, the regularity of heat and mass transfer, proving the corresponding mathematical model, and research and optimization of the CFB flue gas desulfurization in the academic and industrial unit.Changing the inlet duct and choosing the circulating feed inlets, that is the experimental study on the radial profile of the local solid concentration in the riser at the side inlet duct and the swan neck by using an optical fiber probe, and numerical simulation analysis of the gas-solid flow field distribution in the riser, it is to study the regularity of the local particle concentration distribution in the specific inlet-duct, ventuti distributor and the position of the circulating feed inlet. Based on experimental results, both the difference of the inlet-duct and position of circulating feed inlet have a great impact on the local particle distribution, there is a better gas-solid flow by the swan neck than side inlet-duct, that is optimization. At the same time, the two-fluid model combined with the kinetic theory approach for the particle phase and the equation were built, the results of numerical simulation show that the revised model can better describe the gas-solid flow phenomenon in the reactor. The industrial unit was designed and the proposed gas-solid flow model was applied to predict the flow field. It provides a foundation for the design of an engineering unit.