39 Gasification of char particles with CO2 AND H2O

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Abstract

Gasification of large char particles with CO2 and H2O has been investigated both experimentally and with model studies. A local volumetric rate model is derived that takes into account the chemical reaction rate and the effective diffusivity being a function of the local carbon conversion and therefore a function of time and position within the particle. The model includes shrinking unreacted core and homogeneous reaction as extreme cases. Chemical reaction rates of powdered deal wood char were measured for different CO2 and/or H2O concentrations (0.05 - 2 mol/m3) and as a function of the carbon conversion and temperature (1073 - 1273 K) by means of a modified thermobalance. In separate single particle tests the effective diffusivity has been determined for different carbon conversions. A specially designed single particle reactor has been used for local carbon conversions. measurement within 0,04 m particles. Carbon conversion profiles obtained differ from those predicted by the shrinking core and homogeneous reaction extremes but could be very well explained by the local volumetric rate model. As an example results obtained from a 3 kg/h co-current moving bed wood gasifier are presented. Char conversion, particle diameter and temperature profiles agree well with the reduction zone model based on the local volumetric-rate particle model.
Original languageUndefined
Pages (from-to)307-313
JournalChemical engineering science
Volume35
Issue number1-2
DOIs
Publication statusPublished - 1980

Keywords

  • IR-68483

Cite this

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title = "39 Gasification of char particles with CO2 AND H2O",
abstract = "Gasification of large char particles with CO2 and H2O has been investigated both experimentally and with model studies. A local volumetric rate model is derived that takes into account the chemical reaction rate and the effective diffusivity being a function of the local carbon conversion and therefore a function of time and position within the particle. The model includes shrinking unreacted core and homogeneous reaction as extreme cases. Chemical reaction rates of powdered deal wood char were measured for different CO2 and/or H2O concentrations (0.05 - 2 mol/m3) and as a function of the carbon conversion and temperature (1073 - 1273 K) by means of a modified thermobalance. In separate single particle tests the effective diffusivity has been determined for different carbon conversions. A specially designed single particle reactor has been used for local carbon conversions. measurement within 0,04 m particles. Carbon conversion profiles obtained differ from those predicted by the shrinking core and homogeneous reaction extremes but could be very well explained by the local volumetric rate model. As an example results obtained from a 3 kg/h co-current moving bed wood gasifier are presented. Char conversion, particle diameter and temperature profiles agree well with the reduction zone model based on the local volumetric-rate particle model.",
keywords = "IR-68483",
author = "M.J. Groeneveld and {van Swaaij}, {Willibrordus Petrus Maria}",
year = "1980",
doi = "10.1016/0009-2509(80)80101-1",
language = "Undefined",
volume = "35",
pages = "307--313",
journal = "Chemical engineering science",
issn = "0009-2509",
publisher = "Elsevier",
number = "1-2",

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39 Gasification of char particles with CO2 AND H2O. / Groeneveld, M.J.; van Swaaij, Willibrordus Petrus Maria.

In: Chemical engineering science, Vol. 35, No. 1-2, 1980, p. 307-313.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - 39 Gasification of char particles with CO2 AND H2O

AU - Groeneveld, M.J.

AU - van Swaaij, Willibrordus Petrus Maria

PY - 1980

Y1 - 1980

N2 - Gasification of large char particles with CO2 and H2O has been investigated both experimentally and with model studies. A local volumetric rate model is derived that takes into account the chemical reaction rate and the effective diffusivity being a function of the local carbon conversion and therefore a function of time and position within the particle. The model includes shrinking unreacted core and homogeneous reaction as extreme cases. Chemical reaction rates of powdered deal wood char were measured for different CO2 and/or H2O concentrations (0.05 - 2 mol/m3) and as a function of the carbon conversion and temperature (1073 - 1273 K) by means of a modified thermobalance. In separate single particle tests the effective diffusivity has been determined for different carbon conversions. A specially designed single particle reactor has been used for local carbon conversions. measurement within 0,04 m particles. Carbon conversion profiles obtained differ from those predicted by the shrinking core and homogeneous reaction extremes but could be very well explained by the local volumetric rate model. As an example results obtained from a 3 kg/h co-current moving bed wood gasifier are presented. Char conversion, particle diameter and temperature profiles agree well with the reduction zone model based on the local volumetric-rate particle model.

AB - Gasification of large char particles with CO2 and H2O has been investigated both experimentally and with model studies. A local volumetric rate model is derived that takes into account the chemical reaction rate and the effective diffusivity being a function of the local carbon conversion and therefore a function of time and position within the particle. The model includes shrinking unreacted core and homogeneous reaction as extreme cases. Chemical reaction rates of powdered deal wood char were measured for different CO2 and/or H2O concentrations (0.05 - 2 mol/m3) and as a function of the carbon conversion and temperature (1073 - 1273 K) by means of a modified thermobalance. In separate single particle tests the effective diffusivity has been determined for different carbon conversions. A specially designed single particle reactor has been used for local carbon conversions. measurement within 0,04 m particles. Carbon conversion profiles obtained differ from those predicted by the shrinking core and homogeneous reaction extremes but could be very well explained by the local volumetric rate model. As an example results obtained from a 3 kg/h co-current moving bed wood gasifier are presented. Char conversion, particle diameter and temperature profiles agree well with the reduction zone model based on the local volumetric-rate particle model.

KW - IR-68483

U2 - 10.1016/0009-2509(80)80101-1

DO - 10.1016/0009-2509(80)80101-1

M3 - Article

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SP - 307

EP - 313

JO - Chemical engineering science

JF - Chemical engineering science

SN - 0009-2509

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