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Full-Text Articles in Engineering
Agglomeration During Fluidized-Bed Combustion Of Biomass, Li Shiyuan, Lu Qinggang, Teng Haipeng
Agglomeration During Fluidized-Bed Combustion Of Biomass, Li Shiyuan, Lu Qinggang, Teng Haipeng
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Wheat stalk is tested to investigate the formation of bed agglomeration. The results show that defluidization time decreases with the combustion temperature increasing. The minimum fluidization velocity of the bed material after the test increases. The K, Ca and Si elements play the most important role in bed defluidization.
Particle Breakage In The Cyclones Of Fluidized Bed Systems, Marvin Kramp, Anja Püttmann, Andreas Thon, Ernst-Ulrich Hartge, Joachim Werther
Particle Breakage In The Cyclones Of Fluidized Bed Systems, Marvin Kramp, Anja Püttmann, Andreas Thon, Ernst-Ulrich Hartge, Joachim Werther
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A breakage model is developed to predict the change in particle size distribution of brittle materials that undergo mechanical stress in gas cyclones. The breakage probability depends on the cyclone inlet gas velocity, solids load, particle size, and a material-specific constant. The model is validated with data from experiments on a laboratory gas cyclone with aluminum oxide and iron oxide. The results are applied to calculate the particle size distribution of a chemical looping combustion process with iron ore as oxygen carrier.
Prediction Of Catalyst Attrition In An Industrial Fluidized Bed Plant Based On Lab Scale Attrition Tests, Ernst-Ulrich Hartge, Stefan Heinrich, Joachim Werther, Anja Püttmann, Andreas Thon, Gegory Patience, Richard Bockrath
Prediction Of Catalyst Attrition In An Industrial Fluidized Bed Plant Based On Lab Scale Attrition Tests, Ernst-Ulrich Hartge, Stefan Heinrich, Joachim Werther, Anja Püttmann, Andreas Thon, Gegory Patience, Richard Bockrath
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The concept that catalyst attrition in a fluidized bed process can be simulated based on the attrition characteristics of the catalyst determined on labscale is applied to DuPont’s large scale process of maleic anhydride production from n-butane using a vanadium phosphorus oxide (VPO) catalyst. In the present cooperation effort the performance data and design parameters of the large scale plant are supplied by the École Polytechnique de Montréal and DuPont. At Hamburg University of Technology the catalyst’s attrition characteristics were determined in labscale attrition tests. Furthermore the fate of the solids in the process was simulated. The results of the …
The Transport Disengagement Height (Tdh) In A Bubbling Fluidized Bed (Bfb), Chian Chan, Jonathan P.K. Seville, Jan Baeyens
The Transport Disengagement Height (Tdh) In A Bubbling Fluidized Bed (Bfb), Chian Chan, Jonathan P.K. Seville, Jan Baeyens
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Bubbles bursting at the surface of a BFB project particles into the freeboard. Coarser particles fall back, the solids loading declines with height in the freeboard, and fines are ultimately carried over. The height of declining solids loading is the TDH, measured in this research by Positron Emission Particle Tracking, and modeled from a balance of forces on ejected particles. Model predictions and PEPT-data are in good agreement. Empirical equations overestimate the TDH.
Investigation Of The Effect Of Fluidization Time On Electrostatic Charge Generation In Gas-Solid Fluidized Beds, Amanda Giffin, Andrew Sowinski, Poupak Mehrani
Investigation Of The Effect Of Fluidization Time On Electrostatic Charge Generation In Gas-Solid Fluidized Beds, Amanda Giffin, Andrew Sowinski, Poupak Mehrani
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This work focused on determining the effect of the fluidization time on particle charging. Charge equilibrium was reached on the bed particles after 60 minutes. The wall particle layer was built with negative and positive charges. Similar sized particles migrated to each region of the bed regardless of fluidization time.
Study Of Solids Entrainment Into Attrition Jets In Fluidized Beds, Feng Li, Cedric Briens, Franco Berruti, Jennifer Mcmillan
Study Of Solids Entrainment Into Attrition Jets In Fluidized Beds, Feng Li, Cedric Briens, Franco Berruti, Jennifer Mcmillan
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Supersonic nozzles are applied to various fluidized bed processes, such as the production of pharmaceutical powders, fluid catalytic cracking, and fluid coking. In applications such as jet milling, it is essential to entrain a maximum flow-rate of solids from the fluidized bed into the jet cavity. Studies of solid entrainment rate into gas jets have been mostly conducted with subsonic jets and none with convergent-divergent nozzles. The purpose of this research is to study solids entrainment into jets issuing from supersonic convergent-divergent nozzles, and particularly the effects of nozzle size, nozzle mass flow-rate, injection gas properties and fluidization velocity. A …
Effects Of Particle Size And Fluidizing Velocity On The Charge Density Of Entrained Fines, Xiaotao T. Bi, John Grace, Kwang Seok Choi, Muammar Omar
Effects Of Particle Size And Fluidizing Velocity On The Charge Density Of Entrained Fines, Xiaotao T. Bi, John Grace, Kwang Seok Choi, Muammar Omar
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A previously-developed Faraday cup fluidized bed unit was modified to facilitate the in-situ monitoring of the transient entrainment rate and net charge of entrained fine powders. This enabled the determination of the transient charge density as a function of particle size and residence time of entrained fine particles. The results showed that the charge density increased significantly with increasing size of entrained fines, but was not very sensitive to the residence time and the fluidizing gas velocity for the finest entrained particles at gas velocities of 0.24 and 0.36 m/s. At Ug=0.48 m/s, the charge density of larger particles increased …
Evaluation Of The Minimum Velocity Of Polydisperse Bed Fluidization Compounded Of Biomass Pellets And Their Mixtures With Fine Particles Of Coal, Zorin Alexander, Isemin Rafail, Viryasov Dmitriy, Kuzmin Sergey
Evaluation Of The Minimum Velocity Of Polydisperse Bed Fluidization Compounded Of Biomass Pellets And Their Mixtures With Fine Particles Of Coal, Zorin Alexander, Isemin Rafail, Viryasov Dmitriy, Kuzmin Sergey
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
It turned out that the change graphs of the absolute value of dimensionless amplitude of pressure fluctuations against air velocity can be used to evaluate values of the minimum fluidization velocity of polydisperse bed biomass pellets. An experimental verification is reported on the early predicting index of agglomeration in bubbling fluidized bed of biomass pellets and fine coal particles.