fluidized-bed combustion

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fluidized-bed combustion

[¦flü·ə‚dīzd ¦bed kəm′bəs·chən]
(mechanical engineering)
A method of burning particulate fuel, such as coal, in which the amount of air required for combustion far exceeds that found in conventional burners; the fuel particles are continually fed into a bed of mineral ash in the proportions of 1 part fuel to 200 parts ash, while a flow of air passes up through the bed, causing it to act like a turbulent fluid.

Fluidized-bed combustion

A method of burning fuel in which the fuel is continually fed into a bed of reactive or inert material while a flow of air passes up through the bed, causing it to act like a turbulent fluid. Fluidized beds have long been used for the combustion of low-quality, difficult fuels and have become a rapidly developing technology for the clean burning of coal. See Fluidization

A fluidized-bed combustor is a furnace chamber whose floor is slotted, perforated, or fitted with nozzles. Air is forced through the floor and upward through the chamber. The chamber is partially filled with particles of either reactive or inert material, which will fluidize at an appropriate air flow rate. When fluidization takes place, the bed of material expands (bulk density decreases) and exhibits the properties of a liquid. As air velocity increases, the particles mix more violently, and the surface of the bed takes on the appearance of a boiling liquid. If air velocity were increased further, the bed material would be blown away.

Once the bed is fluidized, its temperature can be increased with ignitors until a combustible material can be injected to burn within the bed. Proper selection of air velocity, operating temperature, and bed material will cause the bed to act as a chemical reactor. The three broad areas of application of fluidized-bed combustion are incineration, gasification, and steam generation. See Coal gasification, Combustion, Gas turbine, Steam-generating unit

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Regeneration of ashes from fluidized bed combustion boilers burning coal and/or coke with limestone addition for sulfur capture have shown that calcium hydroxide is considerably more reactive than the oxide and, hence, hydration is an essential part of ash reactivation.
Nguyen, "Influence of circulating fluidized bed combustion (CFBC) fly ash on properties of modified high volume low calcium fly ash (HVFA) cement paste," Construction and Building Materials, vol.
[5] Lecuyer, I., Leduc, M., Lefevre, R., Ausset P., Circulating Fluidized Bed Combustion Ash Characterization: The Case of The Provence 250 MW Unit, Collection de Notes Internes de la Direction des Etudes et Recherches, EDF, 1997.
In the case of fluidized bed combustion, the presence of CaO, MgO and [Fe.sub.2][O.sub.3] in the fuel can lead the formation of an active bed which catalyze the reduction of NO and [N.sub.2]O, especially under fuel-rich combustion conditions.
The results of this research provide a basis for which a company could set up large scale fluidized bed combustion power plants that are in compliance with the government standards for gaseous emissions.
A 2.5-year project will explore advanced filtration techniques for the efficient removal of particulate material from gas streams in fluidized bed combustion, combined cycle, and integrated gasification/combined cycle systems.
From 18 (th) International Conference on Fluidized Bed Combustion, Toronto, Ontario, Canada, May 22-26, 2005, 679-687.
concentrate on thermodynamic stability of ettringite prepared by the hydration of ye'elimite with emphasis on a new application of the fluidized bed combustion fly ash into Portland composite cements.
In contrast, agglomeration of bed particles in fluidized bed combustion system is considered as a primary operational issue.
Hence, fluidized bed combustion is better suited for woody biomass (ash melting point > 1000[degrees]C) than for herbaceous biomaterial (e.g.
International Conference on Fluidized Bed Combustion (18th: 2005: Ontario, Canada)