4.6 Article

Modeling study for the effect of particle size on char gasification with CO2

期刊

AICHE JOURNAL
卷 63, 期 2, 页码 716-724

出版社

WILEY-BLACKWELL
DOI: 10.1002/aic.15417

关键词

coal; char gasification; particle size; temperature; reaction area

资金

  1. National Natural Science Foundation of China [U1402272, 21376082]
  2. Foundation of Shanghai Science and Technology Committee [14dz1200100]
  3. Foundation of State Key Laboratory of Coal Conversion [J16-17-301]

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A high temperature stage microscope to investigate the temperature effect caused by particle size on char gasification is applied in this study. Experiments were carried out with different particle sizes for raw chars and chars on molten slag surface, respectively. Heat transfer models were built for the raw char of two temperature distributions and char particle on molten slag, respectively. Results showed that reaction layer temperature of raw char decreased in the reaction dominant while char on molten slag had higher temperature. Temperature difference between two distributions increased with the initial particle size, indicating the temperature effect on large particles was obvious. Shrinking core model was applied and modified herein coupled with the modification of reaction layer temperature and reaction area. Model prediction and experimental data showed good agreements of carbon conversion and reactivity index for raw char and char on molten slag, respectively. (c) 2016 American Institute of Chemical Engineers AIChE J, 63: 716-724, 2017

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