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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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.
According to data from DOE , the 150MW SMC Davao Power Plant Project 2 and the 135 MW FDC-Misamis Circulating Fluidized Bed (CFB) coal-fired power plant project unit 3 have targeted to start commercial operations on May this year while the 165 MW Balingasag Thermal Circulating Fluidized Bed Combustion coal-fired power plant is targeted to start commercial operations this month.
x] during oxy-fuel CFB combustion tests in a mini-circulating fluidized bed combustion reactor.
The efficient performance of fluidized bed gasifiers requires relatively small fuel particles to ensure good contact with bed material, as in fluidized bed combustion.
From very high porosity and reactivity of wood char particles in fluidized bed combustion higher wood-char particle temperature in comparison with coal chars can be assumed.
Specifically, clean-coal technologies may be combustion processes like fluidized bed combustion and low [NO.
The scope of work for the project encompasses the supply, erection, testing and commissioning of 3 units of 50 MW capacity each based on Fluidized Bed Combustion Technology.
Today, high-level government officials and special invited guests attended a ribbon-cutting ceremony commemorating the construction and commissioning of an oxy-fired pressurized fluidized bed combustion (oxy-PFBC) pilot test facility at CanmetENERGY-Ottawa.
In this context, the fluidized bed combustion (FBC) system is one of the most promising technologies.
In a demonstration of pressurized fluidized bed combustion, American Electric Power Corp.
He and his students and colleagues have worked on a wide range of topics, both fundamental and applied, including hydrodynamics and heat transfer of low-velocity and high-velocity fluidized beds, reactor modelling, scale-up, fluidized bed combustion, steam reforming, three-phase fluidization, and spouted beds.
Given the poor quality of domestic coal, and in order to increase its utilisation in power generation, WAPDA has commissioned the development of the Lakhra project, based on the fluidized bed combustion technology comprising three units of 50MW each.