Residence Time Distribution of Particles in a Bubbling Fluidized Bed with Their Continuous Input and Output
连续进出料鼓泡流化床颗粒停留时间分布

The characteristics of residence time distribution(RTD) of solid particles(Geldart B) with the pulse particle tracer approach in two cold rectangular bubbling fluidized beds(BFB) with continuous particle flow were experimentally investigated.The parameters tested were superficial gas velocity(U),feeding rate of particles(Gs),particle bed height(H) and particle size(dp),and the used tracer was coal particles.The results showed that Gs,H and dp were the major influential factors,while U affected little.The particle flow pattern in BFB reactor lied between those of the ideal plug flow reactor and completely stirred reactor(CSTR),it was close to the plug flow when the particle bed height was lower and Gs larger,whereas the flow was much closer to the full mixing flow of the CSTR at the higher particle bed height and smaller Gs.The averaged residence time of particles was calculated as the value of 9%-18% below of the plug flow for the design of BFB based on the present experimental data.