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Fragmentation of small coal particles under fluidized-bed combustor conditions

Identifieur interne : 000D75 ( Istex/Curation ); précédent : 000D74; suivant : 000D76

Fragmentation of small coal particles under fluidized-bed combustor conditions

Auteurs : B. R. Stanmore [Australie] ; A. Brillard [France] ; P. Gilot [France] ; L. Delfosse [France]

Source :

Symposium (International) on Combustion [ 0082-0784 ] ; 1996.

RBID : ISTEX:495B17354B7DF6144D0F3DE89E1E4632F5101C64

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Wicri :
- topic : Conférence internationale.

English descriptors

Abstract

Particles of four coals sereened to mean diameters (do) of 1.5 and 2.5 mm were subjected to rapid radiant heating under nitrogen and/or 5% oxygen, and the product particles were collected after some seconds. The number distributions of size for the products were compared to the original distributions. The 1.5-mm particles suffered limited breakage with some dust and a small amount of do/2 fragments produced. The amount of breakage was independent of volatile matter content, but greater with higher vitrinite materials. The behavior was consistent with the predictions of a model based on thermally induced stress. The manner of breakage of 2.5-mm particles of a very high VM coal and an anthracite were contradictory, with only some particles of the former breaking, but most of the latter. Increasing the pressure to 1.0 MPa led to less breakage with the high VM coal, suggesting that pressure from the volatiles is contributing to breakage. The degree of fragmentation under 1.0 MPa increased for the anthracite, which is consistent with the operation of the thermal stress model. The influence of oxygen on breakage in this case is determined by the volatile matter content.

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https://api.istex.fr/document/495B17354B7DF6144D0F3DE89E1E4632F5101C64/fulltext/pdf

DOI: 10.1016/S0082-0784(96)80173-1

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Le document en format XML

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<term>Breakage</term>
<term>Chirone</term>
<term>Coal particles</term>
<term>Coal samples</term>
<term>Coal science</term>
<term>Coal sphere</term>
<term>Coal utilization</term>
<term>Combustion institute</term>
<term>Compressive stress</term>
<term>Content coals</term>
<term>Flambant</term>
<term>Fluidized beds</term>
<term>Fragmentation</term>
<term>Fragmentation behavior</term>
<term>Greater extent</term>
<term>Higher temperatures</term>
<term>International conference</term>
<term>John wiley</term>
<term>Larger particles</term>
<term>Less breakage</term>
<term>Major product fragments</term>
<term>Modal diameter</term>
<term>Mure</term>
<term>Mure anthracite</term>
<term>Mure coal</term>
<term>Optical technique</term>
<term>Original size range</term>
<term>Other hand</term>
<term>Outer shell</term>
<term>Particle</term>
<term>Particle breakage</term>
<term>Particle size distributions</term>
<term>Physical properties</term>
<term>Primary fragmentation</term>
<term>Product particles</term>
<term>Product size distributions</term>
<term>Provence</term>
<term>Provence coal</term>
<term>Provence particles</term>
<term>Pure nitrogen</term>
<term>Radial direction</term>
<term>Same conclusion</term>
<term>Small coal particles</term>
<term>Small particles</term>
<term>Smaller particles</term>
<term>Thermal stress</term>
<term>Thermal stress model</term>
<term>Thermal stresses</term>
<term>Uidized beds</term>
<term>Vitrinite</term>
<term>Vitrinite content</term>
<term>Volatile</term>
<term>Volatile matter content</term>
<term>Volatile pressure</term>
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<term>Chirone</term>
<term>Coal particles</term>
<term>Coal samples</term>
<term>Coal science</term>
<term>Coal sphere</term>
<term>Coal utilization</term>
<term>Combustion institute</term>
<term>Compressive stress</term>
<term>Content coals</term>
<term>Flambant</term>
<term>Fluidized beds</term>
<term>Fragmentation</term>
<term>Fragmentation behavior</term>
<term>Greater extent</term>
<term>Higher temperatures</term>
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<term>Mure coal</term>
<term>Optical technique</term>
<term>Original size range</term>
<term>Other hand</term>
<term>Outer shell</term>
<term>Particle</term>
<term>Particle breakage</term>
<term>Particle size distributions</term>
<term>Physical properties</term>
<term>Primary fragmentation</term>
<term>Product particles</term>
<term>Product size distributions</term>
<term>Provence</term>
<term>Provence coal</term>
<term>Provence particles</term>
<term>Pure nitrogen</term>
<term>Radial direction</term>
<term>Same conclusion</term>
<term>Small coal particles</term>
<term>Small particles</term>
<term>Smaller particles</term>
<term>Thermal stress</term>
<term>Thermal stress model</term>
<term>Thermal stresses</term>
<term>Uidized beds</term>
<term>Vitrinite</term>
<term>Vitrinite content</term>
<term>Volatile</term>
<term>Volatile matter content</term>
<term>Volatile pressure</term>
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<front><div type="abstract" xml:lang="en">Particles of four coals sereened to mean diameters (do) of 1.5 and 2.5 mm were subjected to rapid radiant heating under nitrogen and/or 5% oxygen, and the product particles were collected after some seconds. The number distributions of size for the products were compared to the original distributions. The 1.5-mm particles suffered limited breakage with some dust and a small amount of do/2 fragments produced. The amount of breakage was independent of volatile matter content, but greater with higher vitrinite materials. The behavior was consistent with the predictions of a model based on thermally induced stress. The manner of breakage of 2.5-mm particles of a very high VM coal and an anthracite were contradictory, with only some particles of the former breaking, but most of the latter. Increasing the pressure to 1.0 MPa led to less breakage with the high VM coal, suggesting that pressure from the volatiles is contributing to breakage. The degree of fragmentation under 1.0 MPa increased for the anthracite, which is consistent with the operation of the thermal stress model. The influence of oxygen on breakage in this case is determined by the volatile matter content.</div>
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Fragmentation of small coal particles under fluidized-bed combustor conditions

Fragmentation of small coal particles under fluidized-bed combustor conditions

Source :

Descripteurs français

English descriptors

Abstract

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Links to Exploration step

Le document en format XML

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