Improved techniques for gasifying coal. Twelfth quarterly report, April 1, 1979-June 30, 1979

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In the study of high velocity fluidized beds, bed expansion of three fine group A powders is described by a modified Richardson and Zaki correlation. The two parameters in this correlation are shown to be inherently tied to the clustering behavior of fine powders. Particle properties affect bed expansion, but the main parameter is shown to be particle size distribution. The index n in the modified Richardson-Zaki correlation is thought of as a measure of segregation of the bed; being high (approx. 10) in the slugging regime and low (approx. 5) in the more homogeneous turbulent regime. Cluster size and … continued below

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49 pages

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Graff, R.A. & LaCava, A.I. January 1, 1979.

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In the study of high velocity fluidized beds, bed expansion of three fine group A powders is described by a modified Richardson and Zaki correlation. The two parameters in this correlation are shown to be inherently tied to the clustering behavior of fine powders. Particle properties affect bed expansion, but the main parameter is shown to be particle size distribution. The index n in the modified Richardson-Zaki correlation is thought of as a measure of segregation of the bed; being high (approx. 10) in the slugging regime and low (approx. 5) in the more homogeneous turbulent regime. Cluster size and voidage are calculated from the two parameters in the Richardson-Zaki approach and some light is thrown in the phenomenon of clustering. This aggregation of fine powders is thought to be a dynamic phenomenon, with particles quickly moving in and out of clusters. Thus the hydrodynamics of the bed can be described as somewhere between a hard sphere picture of clusters and that of a bed composed of individual particles. These cluster properties prove useful for predicting bed expansion. However, because of the dual nature of these clusters, it is believed that the effectiveness of the bed as, for example, a catalytic reactor, will not be impaired. Empirical yield correlations involving two coal properties as independent parameters were developed using the technique of step-wise regression to identify the parameter pairs that provide the best fit. These correlations of yields of the individual products are valid for the reaction conditions employed.

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49 pages

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NTIS, PC A03/MF A01.

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  • January 1, 1979

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  • July 3, 2018, 8:14 a.m.

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Graff, R.A. & LaCava, A.I. Improved techniques for gasifying coal. Twelfth quarterly report, April 1, 1979-June 30, 1979, report, January 1, 1979; New York. (https://digital.library.unt.edu/ark:/67531/metadc1198463/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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