Carbon fines production and elutriation from the bed of a fluidized coal combustor

Donsı̀, Giorgio; Massimilla, L.; Miccio, Michele

doi:10.1016/0010-2180(81)90039-0

Cited by 78 publications

(29 citation statements)

References 2 publications

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“…Data-scattering in respect to the straight line E"' = k(U -U,)W,/d reflects the influence of bed temperature already mentioned in discussing Figure 10. Data points of the previous sets of experiments (Donsi et al, 1979;Cammarota et al, 1981) carried out with 0.2-0.4 mm sand, bed temperature of 850"C, fluidizing velocity between 50 and 130 cm-s-', and coal feed between 0.4-1 mm and 6-9 mm, fell in the dotted area. The value of k based on all the 121 data available is 1.86-10-7, with a standard deviation of 0.33-10-'.…”

Section: ~1 0~~mentioning

confidence: 96%

Carbon attrition during the fluidized combustion of a coal

1983

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The generation of carbon fines by attrition during the fluidized combustion of a bituminous coal has been studied by means of a 140mm ID fluidized‐bed combustor under variable excess air factor, bed temperature, fluidizing velocity and size of bed sand and coal. Results indicate that rates of attrited fines are roughly proportional to excess of gas velocity above the minimum for fluidization and bed carbon exposed surface. Attrition rate constant is affected by size of sand and, to a less extent, and particularly with finer coal, by bed temperature.

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Section: ~1 0~~mentioning

confidence: 96%

Carbon attrition during the fluidized combustion of a coal

1983

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“…6 Among the particle properties, the size of the particles is of particular importance. Donsi et al 7 found that the carbon attrition rate in their bubbling bed combustor is in inverse proportion to the average particle diameter. Wang et al 8 found that K af of the ashes from the same coal decays exponentially with increasing particle size.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of Chemical and Mineral Components on the Attrition Characteristics of Coal Ashes for Fluidized Bed Boilers

Wang

Yang

et al. 2012

Energy Fuels

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In this paper, the attrition characteristics of ashes of 25 different coals used in circulating fluidized bed boilers were experimentally studied. The attrition characteristics were described by the attrition rate constant K af , which was obtained by the static combustion and cold sieving method. The effects of 10 chemical components and 6 mineral components on K af were evaluated by the gray relational analysis method. The main phases of the mineral components in the coal ashes were determined by X-ray diffraction, and anhydrite (CaSO 4 ), lime (CaO), quartz (SiO 2 ), hematite (Fe 2 O 3 ), metakaolinite (Al 2 Si 2 O 7 ), and metaillite (KAl 2 AlSi 3 O 11 ) were identified. The results showed that, for a given mass fraction, the significance of the influence of the ash chemical components on K af follows the sequence: CaO > MgO > SO The significance of the influence of the ash mineral components on K af follows the sequence: lime (CaO) > anhydrite (CaSO 4 ) > hematite (Fe 2 O 3 ) > metaillite (KAl 2 AlSi 3 O 11 ) > metakaolinite (Al 2 Si 2 O 7 ) > quartz (SiO 2 ). In addition, the effect of the hardness of individual mineral components on K af was also discussed.

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“…The exponential correlation of Lin et al [6] appears to be an exception to this general form, but replotting their data shows that there is no need for an exponential correlation, and that a good fit is also achieved with a linear regression. Notwithstanding this basic similarity, each of these correlations has been obtained for different materials, experimental set-up and ope- [7] a dp coal in indicated pipe holes, and bed 0. rating conditions, making it difficult to compare them. In this work, the attrition of common salt and fluid cracking catalyst (FCC) is considered, focusing in particular on the link between single particle properties and bulk attrition behaviour.…”

Section: Introductionmentioning

confidence: 86%