Fluidised-bed combustion of a charge of coke with a wide distribution of particle sizes

Mota, O.D.S.; Pinto, A.M.F.R.; Campos, J.B.L.M.

doi:10.1016/0009-2509(94)85082-8

Cited by 4 publications

(2 citation statements)

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“…To determine the overall combustion resistance based on the experimental data, it is supposed that the combustion of the char particles only took place in the dense phase of the bed, as previously suggested by many authors. ,,− According to the same authors, it is also assumed that the oxygen concentration in this phase is uniform due to the high degree of bed agitation, while the oxygen concentration in the bubble size is obtained in accordance with the two phase theory of fluidization.…”

Section: Theoretical Mathematical Modelmentioning

confidence: 99%

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Pereira

Pinho

2013

Energy Fuels

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The fluidized bed reactor is suitable for the combustion of biomass solid fuels because of its advantages in terms of pollution control. At the same time it is a useful laboratory tool to determine kinetic and diffusive combustion data in operating conditions similar to those found in industrial systems. Because of the heterogeneous nature of biomass, available information on its combustion is still limited. During the combustion of ligneous biomass, the burning of the solid carbonaceous residues formed after the initial steps of drying and volatiles release is the time-consuming step. In the present work, kinetic and diffusive data from the fluidized bed combustion of chars produced from four Portuguese wood speciesQuercus ilex (holm oak), Eucalyptus globulus (eucalyptus), Pinus pinaster (maritime pine), and Quercus suber (cork oak)were obtained in the 750–900 °C temperature range. Subsequently, activation energies and pre-exponential factors were calculated from the Arrhenius plot of the kinetic data. The obtained activation energies from 38 to 121 kJ/mol are coherent with results obtained for other wood chars and demonstrate that the fluidized bed technology is a fruitful and reliable methodology to achieve a collection of results of real and industrial interest. The main goal of the present work is to widen the information on the kinetic and diffusive data of wood chars in order to better understand the mechanisms of ligneous biomass combustion, and the data now published increases the range of available kinetic data on wood char combustion.

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Section: Theoretical Mathematical Modelmentioning

confidence: 99%

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Pereira

Pinho

2013

Energy Fuels

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“…Although sub-stantial operating experience in CFB combustion has been gained by the industry, there exists great scope of research effort in pursuing a better understanding of the fundamental aspects of this technology. Because of the interest in bubbling-bed coal combustion technology in the last two decades, a large number of studies have been undertaken [2][3][4][5][6][7]. On the other hand, the combustion characteristics in a CFB are different from those in a bubbling bed because of the inherent difference between the fluid dynamics of the two systems.…”

Section: Introductionmentioning

confidence: 99%

Temperature and gas concentration profiles in a circulating fluidized-bed combustor burning an Indian coal

Nag

2000

Proceedings of the Institution of Mechanical Engineers, Part A:

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An experimental investigation has been carried out to study the bed temperature and gas concentration profiles due to combustion of an Indian coal in a laboratory-scale circulating fluidizedbed (CFB) combustor of 102 mm Â 102 mm cross-section and 5.25 m high, made of insulating firebricks. As the sulphur content of the coal burned was low, no sorbent was used. Sand acted as the bed material. The results are discussed for four different superficial velocities at a constant coal feed rate. The temperature of the bed was essentially uniform for each of the superficial velocities used. The oxygen concentration decreases along the riser height showing that combustion continues over its entire length. The carbon monoxide concentration decreases along the riser except only near the top. The carbon dioxide concentration, however, increases along the riser except near the top. The concentration of NO x is also discussed, as it is a significant pollutant from coal combustion. The results are explained to obtain some insight into the combustion of coal in a CFB.

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Fragmentation on batches of coke or char particles during fluidized bed combustion

Pinho

2006

Chemical Engineering Journal

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Fluidised-bed combustion of a charge of coke with a wide distribution of particle sizes

Cited by 4 publications

References 0 publications

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Temperature and gas concentration profiles in a circulating fluidized-bed combustor burning an Indian coal

Fragmentation on batches of coke or char particles during fluidized bed combustion

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