In this paper, the effect of fluidized bed temperature on primary fragmentation of Huadian oil shale was investigated experimentally in thermal state using a small-scale fluidized bed with N2 as fluidizing gas. The fluidized-bed temperatures changed from 600 °C to 1000 °C. Experimental results indicate that the fluidized bed temperature is an important factor of primary fragmentation of oil sha...

An accurate prediction of the minimum fluidization velocity is a crucial hydrodynamic aspect of the design of fluidized bed reactors. Common approaches for the prediction of the minimum fluidization velocities of binary-solid fluidized beds are first discussed here. The data of our own careful experimental investigation involving a binary-solid pair fluidized with water is presented. The effect...

effect of temperature on hydrodynamics of bubbling gas-solid fluidized beds was investigated.  experiments were carried out in the range of 25-600 ºc and different superficial gas velocities in the range of 0.17-0.78 m/s with sand particles. time-position trajectory of particles was obtained by radioactive particle tracking technique. these data were used for determination of mean velocities of...

Comparative analysis of the steady-state and transient properties a bubbling fluidized-bed catalytic reactor obtained according to different mathematical models emulsion zone was performed verify commonly used assumption regarding pseudohomogeneous nature this zone. Four dynamics were formulated, based on thermal diffusional conditions at gas-solid interface within catalyst pellet, namely model...

The history of fluidized bed technology dates back 60 years. Gasification of pulverized coal in the Winkler process during the 1920's marked the beginning of fluidized bed application. Consider­ ,able work done during World War II by U.S. oil companies to improve the catalytic cracking of kerosene led to the development of the Fluid Catalytic Cracking process. Fluidized bed technology later exp...

Thermochemical conversion in dual fluidized bed (DFB) systems is a potential alternative to the recycling of abundantly available plastic waste. The development oxygen transport DFB most cases unavoidable due transition metal content material as well fraction waste stream. This work investigates influence oxide-induced on thermochemical high-density polyethylene, model feedstock, bubbling react...

Systematic simulations are carried out based on the model of fluidized beds proposed by the present authors [K.Ichiki and H.Hayakawa, Phys. Rev. E 52, 658 (1995)]. From our simulation, we confirm that fluidization is a continuous transition. We also confirm the existence of two types of fluidized phases, the channeling phase and the bubbling phase. We find the close relations between the averag...

A novel experimental method for the lateral mixing of binary solids in bubbling fluidized beds was developed based on capacitance probe technique. The evolutions local ratios a bed which can be assumed as one cell were analyzed detail. within resolved and effect convection diffusion mechanism evaluated individually. results show that at lower part bed, plays more important role process near wal...