What is fluidized bed furnace?

What is fluidized bed furnace?

A fluidized furnace has an enclosed space with a base having openings to admit air. Crushed coal, ash and crushed dolomite or limestone is mixed in the bed furnace and high velocity combustion air is then passed through the bed, entering from the furnace bottom.

What is the purpose of a fluidized bed?

Fluidized beds are a very important and common process technology used for everything from roasting coffee beans and drying agricultural grains to fluid catalytic cracking and pharmaceutical granulation.

How does a fluidized bed boiler work?

In fluidized-bed boilers a bed, usually consisting of sand particles, is brought into a fluidized state by primary air supplied from below the bed. Solid fuel added to the bed will burn in the oxygen-rich conditions inside the bed created by the primary air.

What is principle of fluidized bed reactor?

In this type of reactor, a fluid (gas or liquid) is passed through a solid granular material (usually a catalyst) at high enough speeds to suspend the solid and cause it to behave as though it were a fluid. This process, known as fluidization, imparts many important advantages to an FBR.

What is a fluidized bed heat exchanger?

Fluid bed technology is used for cooling, heating and drying of bulk solids materials. Fluid bed heat exchange takes place by passing a gas (most commonly air) through a perforated distributor plate which then flows through a layer (bed) of solids. The air performs two functions.

How fluidized bed is formed?

A fluidized bed is formed when a quantity of a solid particulate substance (usually present in a holding vessel) is forced to behave as a fluid; usually by the forced introduction of pressurised fluid, often a gas through the particulate medium.

What are the advantages of fluidized bed reactor?

Fluidized-bed reactors offer a much higher efficiency in heat exchange, compared to fixed beds, and better temperature control, due to the turbulent gas flow and rapid circulation. At the same time, the high gas velocities do not cause any pressure drop issues and smaller catalyst particles can be employed.

What are the disadvantages of fluidized bed reactor?

There are a few disadvantages to using fluidized beds. Due to the expansion of the materials in the reactor, the size of the vessel must be increased, which leads to a higher initial capital cost. Also, because the fluidized material is solid, this leads to some erosion of the components inside.

Who invented the fluidized bed?

Foster Wheeler pioneered the use of fluidized bed technology in the 1940s but in the early 1970s launched a research and development program into CFB technology at its John Blizard Research Center in Livingston, New Jersey.