What is the status of bed when the pressure drop becomes constant in fluidized bed reactor?

The pressure drop in the fluid phase across the bed is constant and equal to the bed weight over unit surface of the bed cross section. This value is reached at the minimum (incipient) fluidization velocity. When the bed is fluidized with liquids, we have the case of the “homogenous” fluidization.

What is one of the reason for poor fluidization beds in terms of pressure drop?

9. What is one of the reason for poor fluidization beds in terms of pressure drop? Explanation: Slug formation leads to irregular distribution of pressure drop in the bed.

What is the approximate pressure drop across the orifice distributor?

What is the approximate pressure drop across the orifice distributor? Explanation: From the experimental studies, it was found that pressure drop was 10\% across the distributor.

Which of the following happens when the gas velocity increases in fluidization?

Increasing the gas velocity further increases the drag force exerted on the particles, which can separate more contact points between particles, thus bringing them to the fluidized state. The pressure drop increases with increasing gas velocity, as more particles need to be suspended.

What is pressure drop in fluidized bed?

The pressure drops to the point where the upward force on the bed is balanced by the downward force due to the weight of the bed particles. Further increases in gas velocity fluidize the bed, the pressure drop rises slightly until slugging and entrainment occurs.

Is fluidized bed reactor continuous?

Fluidized bed reactors not only allow for continuous operation but also high heat and mass transfer coefficients can be achieved [27]. The resulting improved heat and mass transfer allows for higher charging/discharging power of such storage systems.

What is minimum fluidization?

The minimum fluidization velocity (Umf), defined as the superficial gas velocity at which the drag force of the upward moving gas becomes equal to the weight of the particles in the bed, is one of the most important parameters associated with a fluidized bed system.

What is aggregative fluidization?

aggregative fluidization (boiling fluidization) The type of fluidization that occurs when the fluid and solids have significantly different densities, as occurs in gas/solid systems and some liquid/solid systems.

What is fluidization Slideshare?

 Fluidization refers to those gas-solids and liquid-solids system in which the solid phase is subjected to behave more or less like a fluid by the upwelling current of gas or liquid stream moving through the bed of solid particles. 2.

What is continuous fluidization?

A. Solids are completely entrained. The pressure drop is less than that for batch fluidisation. There is no entrainment of solids.

Why fluidization is required?

Fluidized beds are used as a technical process which has the ability to promote high levels of contact between gases and solids. Extremely high surface area contact between fluid and solid per unit bed volume. High relative velocities between the fluid and the dispersed solid phase.

What is the bed porosity?

The free-volume fraction of the FGB is known as the porosity of the granular bed. The average porosity ε of an FGB is a statistical characteristic of the bed, which is required for thermal and hydraulic analyses of contact and adsorption vessels.