Continuous fluidization

Fig. 3. Continuous fluidized-bed vapor phase reduction of nitrobenzene.

Fluidized bed dehydrogenation technology is more prevalent in the former Soviet Union. A continuous fluidized-bed reactor system is used with a... 

Fluid coking a continuous fluidized solids process that cracks feed thermally over heated coke particles in a reactor vessel to gas, liquid products, and coke. 

Monitoring of a start-up sequence of a continuous fluidized bed granulator... 

Hanni et al. (1976) described a continuous fluidized bed drier using the centrifugal principle. It consisted of a perforated horizontal cylinder rotating inside a plenum with hot air blown across the outside of the cylinder and perpendicular to the axis of rotation (Figure 1.20). Vanes placed in the air inlet allowed the incident angle of the air flow to be varied from 0° to 45° to the perpendicular. Particles were fluidized inside the Teflon-coated stainless steel cylinder which could be tilted by up to 6° in order to control particle residence time. The cylinder, of... 

De Michelis, A. and Calvelo, A., Production rate optimization in continuous fluidized bed freezers, ]. Food Sci., 50 (1985) 669-673. 

A primary difference is that a higher fluidization velocity is desired resulting in the need for an expanded deceleration zone, hence the extended conical expansion chamber. Additionally, continuous fluidization is desireable from both economical and functional points of view. For this reason, the filter housing is enlarged and designed to shake fines back into the batch without stopping fluidization or spraying. 

TABLE 9.15. Performance Data of Continuous Fluidized Bed Dryers (a) Data of Fluosatatic Ltd. 

Continuous fluidized bed equipment has been utilized for gas adsorption, but usually attrition losses of comparatively expensive adsorbents have been prohibitive and the loss of efficiency because of axial mixing has been a serious handicap. Drying equipment such as those of Figure 9.13 presumably can be operated in reverse to recover valuable substances from a vapor phase, and the forward mode applied for regeneration in associated equipment. Other possibly suitable fluidized bed configurations are those of the reactors of Figures 17.32(a), (c), and (d). 

Matsui, L Kojimas, T. Furusawa, T. Kunii, D. Gasification of coal char in a continuous fluidized bed reactor. In Fluidization Kunii, D., Toei, R.,... 

Continuous suspended solids agglomerators Development of continuous fluidized bed granulators was triggered by the desire to increase the capacity per unit while maintaining product quality. From a process point of view the advantage of continuous operation is that stationary and optimized conditions do prevail. 

Fluid coking (Fig. 2.5) is a continuous fluidized solids process that cracks feed thermally over heated coke particles in a reactor vessel to gas, liquid products, and coke. Heat for the process is supplied by partial combustion of the coke, with the remaining coke being drawn as product. The new coke is deposited in a thin, fresh layer on the outside surface of the circulating coke particle. 

The proposed reaction will be performed in a fluidized-bed reactor. This operation consists of two stages. In the first, the solids CuCl (cnprous chloride) and FeS (ferrosilicon) or pnre silicon are thoronghly mixed in the bed, which is continuously fluidized by an inert gas at a velocity close to u f. The following solid-solid reaction takes place (which is equivalent to the last step shown in reaction [CS12.R1]) ... 

Well-mixed continuous fluidized bed dryers are most commonly used if the final product moisture content distribution is permitted to vary somewhat due to the inherent residence time distribution in the dryer. Equilibration occurs during storage, resulting in uniform product moisture. 

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