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Title: Comparison of gasification kinetics parameters of different types of nuclear graphite

Abstract

A chemical-reaction kinetics model of nuclear graphite gasification has recently been developed and successfully validated with gasification rate measurements for nuclear graphite grades of IG-110, IG-430, NBG-18 and NBG-25. The model employs 4 elementary chemical reactions with applicable parameters, including the values and Gaussian-like distributions of the specific activation energies, the pre-exponential coefficients for adsorption of oxygen and desorption of CO and CO{sub 2} gases, and the surface area of free active sites. These parameters are determined from the reported measurements of the total gasification and transient weight loss using a multi-parameter optimization algorithm. The determined chemical kinetics parameters for IG-100 and NB-25 are nearly the same, but slightly different from those for NBG-18 and IG-430. The initial specific area of free active sites is inversely proportional to the square root of the mass or volume of the graphite specimens used in experiments. The recommended chemical kinetics parameters in this paper for these grades of nuclear graphite should be applicable to future safety analysis of high-temperature gas cooled reactors in the unlikely event of a massive air ingress accident. (authors)

Authors:
 [1];  [2];  [2];  [1];  [2]
  1. Inst. for Space and Nuclear Power Studies, Univ. of New Mexico, Albuquerque, NM (United States)
  2. (United States)
Publication Date:
Research Org.:
American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
OSTI Identifier:
22105965
Resource Type:
Conference
Resource Relation:
Conference: ICAPP '12: 2012 International Congress on Advances in Nuclear Power Plants, Chicago, IL (United States), 24-28 Jun 2012; Other Information: Country of input: France; 11 refs.; Related Information: In: Proceedings of the 2012 International Congress on Advances in Nuclear Power Plants - ICAPP '12| 2799 p.
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; ACCIDENTS; ACTIVATION ENERGY; ADSORPTION; AIR; CARBON DIOXIDE; CARBON MONOXIDE; CHEMICAL REACTION KINETICS; COMPARATIVE EVALUATIONS; DESORPTION; GASIFICATION; GRAPHITE; HTGR TYPE REACTORS; OPTIMIZATION; OXYGEN; SAFETY ANALYSIS; SURFACE AREA

Citation Formats

El-Genk, M. S., Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM, Mechanical Engineering Dept., Univ. of New Mexico, Albuquerque, NM, Tournier, J. M. P., and Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM. Comparison of gasification kinetics parameters of different types of nuclear graphite. United States: N. p., 2012. Web.
El-Genk, M. S., Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM, Mechanical Engineering Dept., Univ. of New Mexico, Albuquerque, NM, Tournier, J. M. P., & Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM. Comparison of gasification kinetics parameters of different types of nuclear graphite. United States.
El-Genk, M. S., Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM, Mechanical Engineering Dept., Univ. of New Mexico, Albuquerque, NM, Tournier, J. M. P., and Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM. Sun . "Comparison of gasification kinetics parameters of different types of nuclear graphite". United States.
@article{osti_22105965,
title = {Comparison of gasification kinetics parameters of different types of nuclear graphite},
author = {El-Genk, M. S. and Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM and Mechanical Engineering Dept., Univ. of New Mexico, Albuquerque, NM and Tournier, J. M. P. and Chemical and Nuclear Engineering Dept., Univ. of New Mexico, Albuquerque, NM},
abstractNote = {A chemical-reaction kinetics model of nuclear graphite gasification has recently been developed and successfully validated with gasification rate measurements for nuclear graphite grades of IG-110, IG-430, NBG-18 and NBG-25. The model employs 4 elementary chemical reactions with applicable parameters, including the values and Gaussian-like distributions of the specific activation energies, the pre-exponential coefficients for adsorption of oxygen and desorption of CO and CO{sub 2} gases, and the surface area of free active sites. These parameters are determined from the reported measurements of the total gasification and transient weight loss using a multi-parameter optimization algorithm. The determined chemical kinetics parameters for IG-100 and NB-25 are nearly the same, but slightly different from those for NBG-18 and IG-430. The initial specific area of free active sites is inversely proportional to the square root of the mass or volume of the graphite specimens used in experiments. The recommended chemical kinetics parameters in this paper for these grades of nuclear graphite should be applicable to future safety analysis of high-temperature gas cooled reactors in the unlikely event of a massive air ingress accident. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {7}
}

Conference:
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