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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Williams, "Biomass Co-Firing in a Pressurized Fluidized Bed Combustion (PFBC) Combined Cycle Power Plant: A Techno-Environmental Assessment Based on Computational Simulations," Fuel Process.
x] during oxy-fuel CFB combustion tests in a mini-circulating fluidized bed combustion reactor.
Because of the low burning intensity, more occupied space, intractable structure, low thermal efficiency and bad environmental indicators, the bubbling fluidized bed combustion technology has certain limits.
The aim of this paper is to show that replacing cement with ash from fluidized bed combustion furnace does not cause deterioration in the protective properties of concrete in regard to steel reinforcement.
This report analyzes the global clean coal technology market in terms of revenues for key clean coal technologies-supercritical, ultrasupercritical, Circulating Fluidized bed combustion and IGCC.
We will renovate it into a more environmentally-friendly 300 megawatt circulating fluidized bed combustion facility.
Coal Fired Power Generation Market: Technology Analysis Pulverized coal systems Cyclone furnaces Others (Including fluidized bed combustion, coal gasification) Coal Fired Power Generation Market: Application Analysis Residential Commercial Coal Fired Power Generation Market: Regional Analysis North America Europe Asia Pacific Rest of the World (RoW)
In this context, the fluidized bed combustion (FBC) system is one of the most promising technologies.
18th International Conference on Fluidized Bed Combustion, Toronto, Ontario, Canada, 2005, May 22-25.
The group is currently working in Argentina on two power plants for Enarsa (whose combined capacity is 846 MW) and a coal-fired plant on the Turbioriver, using fluidized bed combustion (FBC), one of the least contaminating technologies.
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.