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Heat and mass transfer in monolithic honeycomb catalysts—III: Radiation model

✍ Scribed by Jiří Sinkule; Vladimír Hlaváček

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
531 KB
Volume
33
Category
Article
ISSN
0009-2509

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✦ Synopsis

An analysis IS made of the effect of radlatton exchange upon the behavior of an exothermlc catalytic reactlon occurring on a surface of a cyhndncal passage An n pnon model was developed for calculation of temperature and conversion profiles m the passage and sohd phase as well The model postulates plug flow and gas-to-sohd heat and mass transfer The gas IS assumed to be transparent but radial exchange wlthm the passage, lonfltudmal conductlon of the solid phase and exothermlc reactlon occumng on the catalyst surface are taken mto account The governmg equations descnbmg this model represent a nonhnear boundary value problem for ordmary dtfferentlal equations and mtegro-ddFerentml equation of Fredholm type subJect to Integral boundary condttlons The resultmg set of nonhnear drfferentml and mtegrodlfferenttal equattons was approxtmated by a specud fimtedlfference scheme and quadrature formulas The set of nonlmear algebrluc equations was solved by the Newton-Raphson method It was found that radlatlon exchange can cause slgmficant changes of temperature dlstrlbutlon m the passage Calculated examples mdlcated that the model suggests the existence of multiple steady states

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