Influence of geometric and thermophysical properties of reaction layer on sulphur dioxide oxidation in transient conditions

Sapundzhiev, C.; Grozev, Georgi G.; Elenkov, D.

doi:10.1002/ceat.270130118

Cited by 21 publications

(3 citation statements)

References 5 publications

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“…The fundamentals of catalytic processes in reversed flow fixed bed reactor operation, are well-known (Boreskov and Kiselev, 1979; Boreskov and Matros, 1979; Kiselev et al, 1980;Sapundzhiev and Grozev, 1990). Part of the results obtained by mathematical modeling of this process have been supported experimentally in laboratory and pilot plants (Boreskov et al, 1982(Boreskov et al, , 1984.…”

Section: Introductionmentioning

confidence: 92%

Unsteady-State SO2 Oxidation: Practical Results

Grozev¹,

Sapundzhiev²,

Elenkov³

1994

Ind. Eng. Chem. Res.

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The results from the operation of an industrial reactor for oxidation of sulfur dioxide at nonsteady-state conditions caused by periodic flow reversal of the reactant are reviewed. The reactor geometry and performance parameters, i.e., gas flow rate 20 000-45 OOO m3/h (NTP), SO2 concentration 1.4-4.8 vol % , conversion 96-97%, gas inlet temperature 40-75 "C, switching time 5-25 min, and pressure drops 3.6-6.0 kPa, are described.

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Section: Introductionmentioning

confidence: 92%

Unsteady-State SO2 Oxidation: Practical Results

Grozev¹,

Sapundzhiev²,

Elenkov³

1994

Ind. Eng. Chem. Res.

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“…This can be a tool to optimize heat transport properties and minimize the pressure drop, see e.g. Sapundzhiev et al (1990). Haynes et al (1995) developed a design equation to determine the optimal length of the inert layers, by determining the length where the temperature is always too low for reaction, and therefore the reactions will not take place in this region, so here the catalyst can be replaced by inert material.…”

Section: Catalyst and Inert Sectionsmentioning

confidence: 99%

Operation of a catalytic reverse flow reactor for the purification of air contaminated with volatile organic compounds

Beld

Westerterp

1997

Can J Chem Eng

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Catalytic oxidation in a reverse flow reactor is an attractive process for the decontamination of air polluted with volatile organic compounds (VOCs). In this paper several aspects of operating this type of reactor for air purification under strongly varying conditions will be discussed.For a successfit operation of such reactor a minimum amount of combustibles is required, and a simple theory is developed to predict this minimum value. This minimum amount is strongly influenced by the reaction kinetics, the heat transport in the packed bed and the adiabaticity of the reactor. To cope with a too low temperature level in the reactor for a complete conversion, an electrical heating device should be installed in the centre of the reactor bed to increase locally the temperature rapidly and efficiently. To control the maximum temperature in case of too high concentrations, extra air should be added to the feed. L'oxydation catalytique dans un reacteur a ecoulement inverse est un procede inteessant pour la decontamination de I'air pollue par des composes organiques volatils (VOC). Dans cet article, plusieurs aspects du fonctionnement de ce type de reacteur pour la purification de I'air dans des conditions extr6mement variables seront analyses.Pour le bon fonctionnement d'un tel reacteur, un apport minimum en combustible est necessaire, et une theorie simple a ete etablie afin de predire cette valeur minimum. Cet apport minimum est fortement influence par la cinetique de la reaction, le transfert de chaleur dans le lit gami et I'adiabicite du reacteur. Pour eviter d'avoir une temperature trop basse dans le reacteur en vue d'une conversion complete, un dispositif de chauffage electrique doit 6tre installe au centre du lit du reacteur afin d'augmenter localement la temperature de faqon rapide et efficace. Pour contrder la temperature maximum en cas de concentrations trop fortes, de l'air doit 6tre ajoute a I'alimentation.Keywords: catalytic combustion, reverse flow operation, air purification. xhaust air from laboratories or factory buildings can be E contaminated with volatile organic compounds (VOCs).In order to reduce the emission of VOCs, a large number of methods are available. The economically most attractive method depends on the specific conditions in each case, including the concentration and nature of the contaminants and the flow rate. Moreover, the polluted air stream might show strong variations in flow rate as well as in concentration and chemical character of the pollutants. In the case of valuable contaminants, separation methods with recovery of the organic compounds might be considered. Examples in this area are membrane separation and pressure swing adsorption. These methods have in common that the contaminants are concentrated in the first step of the process. The second step is the recovery of the contaminants. Another group of purification methods is composed of destructive processes like thermal and catalytic combustion, which are non-selective. Many modifications or combinations are possible, as fo...

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“…Spline approximation was adopted for discretion of the governing Equation (18) (Sapundzhiev et al, 1990). Spline approximation was adopted for discretion of the governing Equation (18) (Sapundzhiev et al, 1990).…”

Section: (24)mentioning

confidence: 99%

Study of unsteady‐state catalytic oxidation of sulfur dioxide by periodic flow reversal

Shuzeng

1996

Can J Chem Eng

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A systematic study of catalytic oxidation of sulfur dioxide in a fixed bed reactor operated in flow reversal mode was made. A heterogeneous transient model of the reactor was developed. The global rate equations and the heat transfer parameter correlation were obtained, based on a series of previous experiments. The experiments of unsteady-state oxidation of low concentration SO, were conducted in a bench-scale fixed bed reactor, packed with a domestic commercial catalyst. The model can successfully predict the transient concentration and temperature profiles when a correction factor is introduced to the global rate equations.On a mene une etude systematique sur I'oxydation catalytique du dioxyde de soufre dans un reacteur a lit fixe a ecoulement inverse. Un modele transitoire heterogene a ete mis au point. Les equations globales de vitesse et la correlation des parametres du transfert de chaleur ont ete obtenues sur la base d'experiences anterieures. Les experiences d'oxydation en regime instationnaire d'une faible concentration de SO, ont ete menees dans un reacteur a lit fixe de laboratoire, garni avec un catalyseur commercial domestique. Le modele peut predire avec succbs la concentration et les profils de temperature transitoires lorsqu'un facteur de correction est introduit dans les equations globales de vitesse.

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Influence of geometric and thermophysical properties of reaction layer on sulphur dioxide oxidation in transient conditions

Cited by 21 publications

References 5 publications

Unsteady-State SO2 Oxidation: Practical Results

Unsteady-State SO2 Oxidation: Practical Results

Operation of a catalytic reverse flow reactor for the purification of air contaminated with volatile organic compounds

Study of unsteady‐state catalytic oxidation of sulfur dioxide by periodic flow reversal

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