Air Fluidized Beds


Air Fluidized Beds

air fluidized beds

  • Fluidization (or fluidisation) is a process similar to liquefaction whereby a granular material is converted from a static solid-like state to a dynamic fluid-like state. This process occurs when a fluid (liquid or gas) is passed up through the granular material.
  • (Fluidize) To make fluid, usually by the rapid introduction of a liquid such as water.
  • (FLUIDIZATION) A flowing liquid impinging on a bed of particles imparts some of its momentum to each particle.  The imparted momentum is in the direction of the fluid flow.  The particles are held to the floor of their container by gravity and to each other by adhesive forces.
  • Cause (a finely divided solid) to acquire the characteristics of a fluid by passing a gas upward through it

  • (bed) furnish with a bed; "The inn keeper could bed all the new arrivals"
  • The time for sleeping
  • A piece of furniture for sleep or rest, typically a framework with a mattress and coverings
  • (bed) a piece of furniture that provides a place to sleep; "he sat on the edge of the bed"; "the room had only a bed and chair"
  • A place or article used by a person or animal for sleep or rest
  • (bed) a plot of ground in which plants are growing; "the gardener planted a bed of roses"

  • This substance regarded as necessary for breathing
  • The invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen
  • be broadcast; "This show will air Saturdays at 2 P.M."
  • air out: expose to fresh air; "aerate your old sneakers"
  • The free or unconfined space above the surface of the earth
  • a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of; "air pollution"; "a smell of chemicals in the air"; "open a window and let in some air"; "I need some fresh air"
air fluidized beds – Combustion Performance

Combustion Performance in a Fluidized Bed Combustor: Application of Air Staging
Combustion Performance in a Fluidized Bed Combustor: Application of Air Staging
This monograph presents the research work carried out in studying the use of air staging technique in a fluidized bed combustor as an effective alternative to control and reduce the emissions from the combustion of industrial and agricultural waste. Fluidized bed combustion has been recognized as a technology that can generate power from solid wastes and more importantly it has been known as a suitable combustion system for biomass. This monograph highlights the influence of applying air staging technique in reducing the gaseous emissions from a fluidized bed combustor. In this investigation, palm shell is used as the source of fuel and silica sand as the inert sand material. This monograph describes the results obtained and the methodology adopted. The outcome of this investigation has shown that the use of the air staging technique has resulted in the reduction of the emission of NOx of more than 50%. This significant reduction is a clear indication of the prospect of using this technology for sustainable management of the environment and a better future for our palm oil industry.

Hassan Abbas Khawaja – 'Bubbles'

Hassan Abbas Khawaja - 'Bubbles'
The fluidized beds are the classical example of 2 phase medium of fluid and solid particle mixture. The phenomenon of bubbling in fluidized bed is analogous to the passage of pressurized air through a tank of water. The sixteen images shown are in chronological order. These images show the variation in the shapes, sizes, mergers and eruptions of bubbles with the time difference of 32.5 milliseconds. Each image shows the phenomenon of bubbling in fluidized bed. These images are generated using the data from CFD-DEM simulation of 2-D fluidized bed. In order to identify the features such as concentration of one phase with respect to other, a 256 colour map is chosen to enhance the image. The images show the fluid bubbles, which are colour coded from pink to purplish. The two phase medium is the mixture of solid and fluid, which is colour coded from red to orange. The interface between 2 phase medium and fluid is colour coded from yellow to blue.

Fluidized Bed Dryer

Fluidized Bed Dryer
Uniquely flexible for a wide range of continuous processing needs, GK’s vibrating fluidized bed dryer / processors are ideally used for heating, drying, cooling, coating, or elutriation. GK vibrating fluidized bed dryer is available in a variety of configurations, and utilize vibratory agitation while passing a process gas through the material bed to suspend the material in a fluidized state. This increases available fluidized bed dryer material surface area, allowing a faster and more complete processing of your material.

air fluidized beds
air fluidized beds

An experimental study on biomass air-steam gasification in a fluidized bed [An article from: Bioresource Technology]
This digital document is a journal article from Bioresource Technology, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Media Library immediately after purchase. You can view it with any web browser.

The characteristics of biomass air-steam gasification in a fluidized bed are studied in this paper. A series of experiments have been performed to investigate the effects of reactor temperature, steam to biomass ratio (S/B), equivalence ratio (ER) and biomass particle size on gas composition, gas yield, steam decomposition, low heating value (LHV) and carbon conversion efficiency. Over the ranges of the experimental conditions used, the fuel gas yield varied between 1.43 and 2.57 Nm^3/kg biomass and the LHV of the fuel gas was between 6741 and 9143 kJ/Nm^3. The results showed that higher temperature contributed to more hydrogen production, but too high a temperature lowered gas heating value. The LHV of fuel gas decreased with ER. Compared with biomass air gasification, the introduction of steam improved gas quality. However, excessive steam would lower gasification temperature and so degrade fuel gas quality. It was also shown that a smaller particle was more favorable for higher gas LHV and yield.