The ash chemistry in fluidised bed gasification of biomass fuels. Part II: Ash behaviour prediction versus bench scale agglomeration tests

Zevenhoven, Maria; Backman, Rainer; Skrifvars, Bengt-Johan; Hupa, Mikko; Liliendahl, T; Rosén, Christer; Sjöström, Krister; Engvall, Klas; Hallgren, Anders

doi:10.1016/s0016-2361(01)00004-7

Cited by 61 publications

(28 citation statements)

References 6 publications

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“…In the case of the neck K, Ca, and Si were present. This corresponds with the findings of Zevenhoven-Onderwater et al [11] who reported the main elements of the bridges and coatings of agglomerates as Si, K, and Ca and of Bartels et al [36] who suggested that K and Na were associated with agglomeration in fluidised beds due to the formation of low-melting silicates.…”

Section: Sem and Eds Analysissupporting

confidence: 91%

“…The presence of porous structures, though not described by the authors, is evident in SEM analysis presented by Öhman and Nordin [35] and Zevenhoven-Onderwater et al [11]. The porosity in those cases appears much less pronounced than was observed in this study.…”

Section: Sem and Eds Analysiscontrasting

confidence: 54%

“…The reliability of such indices has, however, been questioned [7] as they do not take account of the influence of the bed material on the process. For example, the ash fusion temperature is seen as not predicting agglomeration in all cases and although it is widely employed, the standard American Society for Testing and Materials (ASTM) ash fusion test [10] is inadequate for predicting ash-related problems for biomass and energy crops [11]. With this in mind such indices should be used only as a general guide to ash behaviour.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of bed agglomeration during gasification of wheat straw in a bubbling fluidised bed gasifier using mullite as bed material

et al. 2014

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The quantity and composition of the ash content of straw poses technical challenges to its thermal conversion and have been widely reported to cause severe ash sintering and bed agglomeration during fluidised bed gasification. Literature indicates that a combination of reactor design and bed material measures is required to avoid defluidisation at temperatures above 800 °C. Using scanning electron microscopy and energy dispersive X-ray spectroscopy this study investigated the initial agglomeration of a mullite bed during the

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Section: Sem and Eds Analysissupporting

confidence: 91%

Section: Sem and Eds Analysiscontrasting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of bed agglomeration during gasification of wheat straw in a bubbling fluidised bed gasifier using mullite as bed material

et al. 2014

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“…Viscosity and surface tension depend inversely on temperature. The mechanism of deposits formation is described in literature [2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Dielectric loss factor of sintered coal ash

2017

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Abstract. This work presents the study of dissipation factor (tanδ) for ash prepared from a power plant coal. Values of tanδ were measured for samples of coal ash with additive of biomass and kaolinite, sintered at various temperatures up to 1100 o C. Procedure of direct tanδ measurement is described and the results of loss factor as a function of frequency are shown. Quantitative and qualitative changes of tanδ were observed for the different tested samples. The measurement data is compared with SEM microscopic images of the samples sintered at the maximum temperature. The results suggest that direct measurement of tanδ can be a useful tool for slagging and fouling risk assessment.

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“…by Zevenhoven-Onderwater et al (2001) in a lab scale pressurized fluidized bed gasifier with reed canary grass as feedstock and various bed materials. In their experiment, no agglomeration was observed with dolomite up to 900…”

Section: Introductionmentioning

confidence: 99%

Air gasification of oil palm waste over dolomite in a fluidized bed

Lahijani¹

2013

Turkish J Eng Env Sci

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Air gasification of oil palm empty fruit bunch was carried out in a fluidized bed gasifier. Calcined dolomite was used as the catalytic bed material. The effect of bed temperature (650-1050• C) on the quality of the producer gas was examined. During the gasification experiment, a producer gas with improved quality was obtained at high temperatures, but agglomeration of the bed material was realized as the major concern at temperatures above 850Thus, the temperature was reduced and the quality of the product gas was assessed through a set of experiments designed

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The ash chemistry in fluidised bed gasification of biomass fuels. Part II: Ash behaviour prediction versus bench scale agglomeration tests

Cited by 61 publications

References 6 publications

Analysis of bed agglomeration during gasification of wheat straw in a bubbling fluidised bed gasifier using mullite as bed material

Analysis of bed agglomeration during gasification of wheat straw in a bubbling fluidised bed gasifier using mullite as bed material

Dielectric loss factor of sintered coal ash

Air gasification of oil palm waste over dolomite in a fluidized bed

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