| Flue gas desulfurization technology with circulating fluidized bed (CFB) has been developing in the world recently. It is valuable for CFB desulfurizer design optimization to study the gas-solid flow field characteristic in CFB riser. In order to provide experimental reference for those who would go in for research on process of mass and heat transfer of gas-solid in CFB or CFB desulfurizer design, the effects of inlet-duct on gas-solid flow field characteristic in CFB desulfurizer riser was investigated experimentally in present paper. Experimental set-up is consists of a side inlet duct and a side circulating feed inlet, and venturi-pipe that was extensively used in industry as gas distributor. Radial distribution and axial development of local particle concentration in riser under different operational conditions was obtained through experiment. The effects of CFB desulfurizer's inlet-duct on flow field in riser was studied experimentally, furthermore, the characteristics of local particle concentration distribution were thoroughly discussed. The results showed that gas-solid flow field of riser was badly affected by side inlet duct and circulating feed inlet. Consequently, particles in the riser was seriously drift and radial distribution of local particle concentration was extraordinary asymmetrical. Based on experimental results, corresponding suggestion, such as recirculating scrapping from venturi-pipe collapsible tube and multi-directional symmetry recirculating scrapping, was introduced to improve flow field status. In addition, it had a positive effect towards flow field status improvement to increase apparent gas velocity in riser, or reduce particle circulating rate. Comparison between experimental data and that of numerical simulation verified the feasibility of numerical simulation for CFB desulfurizer's interior flow field analysis.
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