Study On The Particle Pressure Fluctuation Of Large Particles Bubbling Fluidized Bed

The fluidized bed technology has been used widely in the energy and chemicalindustry in recent years. However, due to the fluidized bed gas-solid flow ofcomplexity and uncertainty, so that the flow characteristics of the fluid within thefluidized bed is not fully understand yet. The particles pulsating pressure is veryimportant in the design and operation of the fluidized bed, it plays an important role.Characteristics of particles within the bed pressure is generally reflects a variety ofother features, and gas-solid flow test method applied research within the fluidizedbed, heat and mass transfer, and there are many deficiencies in the enlarged models, itcan solve these problems by the application of numerical simulation methods fluentauxiliary test and it can predict the results of tests or experiments too. It hastheoretical guidance for fluidized bed applications.In this paper, we use Euler-Euler two-fluid model to simulate the process of classD fluidized particles. by measuring the same double leg fluidized air distribution plateopenings rate, different apparent wind speed, and the height of the bed was observedin the different pressure pulsating particle bed, change in particle concentration anddual fluidized bed legs turned in bed phenomenon. The resulting data were analyzedby Fourier transform, wavelet transform, the pressure pulsation inside the bedparticles obtained have low frequency characteristics, change in particle concentrationwith broadband characteristics, and the particles within the bed pulsating pressure ismainly due to the formation of bubbles within the bed merger, both sides of thefracture and the mutual exchange of particles caused by the bed legs, and that thetwo-leg turn fluidized bed phenomenon primarily during operation on both sides ofthe bed such that different pressures on both sides of bed particles interchange of theparticles within the leg, which led to different particle concentration on both sides ofthe bed. This is a positive feedback process, and not take the initiative to adjust the concentration of particles within the side of the bed increases will lead to turn the bedphenomenon.