Documents disponibles écrits par cet auteur

Development of a countercurrent multistage fluidized-bed reactor and mathematical modeling for prediction of removal efficiency of sulfur dioxide from flue gases / C. R. Mohanty in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1629–1637 Titre : Development of a countercurrent multistage fluidized-bed reactor and mathematical modeling for prediction of removal efficiency of sulfur dioxide from flue gases Type de document : texte imprimé Auteurs : C. R. Mohanty, Auteur ; G. Malavia, Auteur ; B. C. Meikap, Auteur Année de publication : 2009 Article en page(s) : p. 1629–1637 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Flue  Gases  --  sulfur  dioxide  Fluidization  --  mathematical  modeling Résumé : A bubbling countercurrent multistage fluidized-bed reactor for the sorption of sulfur dioxide by hydrated lime particles was simulated employing a two-phase model, with the bubble phase assumed to be in plug flow and with the emulsion phase either in plug flow (EGPF model) or in perfectly mixed flow (EGPM model). The model calculations were compared with experimental data in term of percentage removal efficiency of sulfur dioxide. Both models were applied to understand the influence of operating parameters on the reactor performance. The comparison showed that the EGPF model agreed well with the experimental data. From the perspective of use of a multistage fluidized-bed reactor as air pollution control equipment in industry, the model could be considered general enough for predicting the performance of reactors for gas−solid treatment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801615c [article] Development of a countercurrent multistage fluidized-bed reactor and mathematical modeling for prediction of removal efficiency of sulfur dioxide from flue gases [texte imprimé] / C. R. Mohanty, Auteur ; G. Malavia, Auteur ; B. C. Meikap, Auteur . - 2009 . - p. 1629–1637. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1629–1637 Mots-clés : Flue  Gases  --  sulfur  dioxide  Fluidization  --  mathematical  modeling Résumé : A bubbling countercurrent multistage fluidized-bed reactor for the sorption of sulfur dioxide by hydrated lime particles was simulated employing a two-phase model, with the bubble phase assumed to be in plug flow and with the emulsion phase either in plug flow (EGPF model) or in perfectly mixed flow (EGPM model). The model calculations were compared with experimental data in term of percentage removal efficiency of sulfur dioxide. Both models were applied to understand the influence of operating parameters on the reactor performance. The comparison showed that the EGPF model agreed well with the experimental data. From the perspective of use of a multistage fluidized-bed reactor as air pollution control equipment in industry, the model could be considered general enough for predicting the performance of reactors for gas−solid treatment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801615c

Development of soft sensor to identify flow regimes in horizontal pipe using digital signal processing technique / Kishore Muvvala in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 3001–3010 Titre : Development of soft sensor to identify flow regimes in horizontal pipe using digital signal processing technique Type de document : texte imprimé Auteurs : Kishore Muvvala, Auteur ; V. Kumar, Auteur ; B. C. Meikap, Auteur Année de publication : 2010 Article en page(s) : pp. 3001–3010 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Development--Sensor--Identify--Flow--Regimes--Horizontal--Pipe--Digital--Signal--Processing--Technique Résumé : The work described in this article is a new analytical and experimental study of two-phase gas−liquid horizontal flow in a conduit for flow pattern identification by a digital signal processing technique. The data are acquired online using a pressure transducer and a National Instruments data acquisition card. The true signal voltage changes rather smoothly as a function of the number of samples, whereas many kinds of noise are added; as a result, rapid, random changes in amplitude from point to point within the signal are observed. To reduce the noise, a smoothing technique is employed. In the smoothing, the data points of a signal are modified so that the individual points that are higher than the immediately adjacent points are reduced and points that are lower than the adjacent points are increased. This naturally leads to a smoother signal. For this purpose, the simplest smoothing algorithm, namely, a simple moving average, is employed and is able to successfully eliminate the noise. After eliminating the noise, the slope of the curve is continuously tracked to determine sudden or abrupt changes. It is interesting to note that, from the signal obtained, the slope is always decreasing in nature and the magnitude is on the order of 5 × 10−3. According to the data and the slope, different flow regimes can be identified by using cross-correlation method. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019215 [article] Development of soft sensor to identify flow regimes in horizontal pipe using digital signal processing technique [texte imprimé] / Kishore Muvvala, Auteur ; V. Kumar, Auteur ; B. C. Meikap, Auteur . - 2010 . - pp. 3001–3010. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 3001–3010 Mots-clés : Development--Sensor--Identify--Flow--Regimes--Horizontal--Pipe--Digital--Signal--Processing--Technique Résumé : The work described in this article is a new analytical and experimental study of two-phase gas−liquid horizontal flow in a conduit for flow pattern identification by a digital signal processing technique. The data are acquired online using a pressure transducer and a National Instruments data acquisition card. The true signal voltage changes rather smoothly as a function of the number of samples, whereas many kinds of noise are added; as a result, rapid, random changes in amplitude from point to point within the signal are observed. To reduce the noise, a smoothing technique is employed. In the smoothing, the data points of a signal are modified so that the individual points that are higher than the immediately adjacent points are reduced and points that are lower than the adjacent points are increased. This naturally leads to a smoother signal. For this purpose, the simplest smoothing algorithm, namely, a simple moving average, is employed and is able to successfully eliminate the noise. After eliminating the noise, the slope of the curve is continuously tracked to determine sudden or abrupt changes. It is interesting to note that, from the signal obtained, the slope is always decreasing in nature and the magnitude is on the order of 5 × 10−3. According to the data and the slope, different flow regimes can be identified by using cross-correlation method. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019215

Equilibrium and kinetic studies on the hydrolysis of urea for ammonia generation in a semibatch reactor / J.N. Sahu in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4689–4696 Titre : Equilibrium and kinetic studies on the hydrolysis of urea for ammonia generation in a semibatch reactor Type de document : texte imprimé Auteurs : J.N. Sahu, Auteur ; K. Mahalik, Auteur ; A. V. Patwardhan, Auteur ; B. C. Meikap, Auteur Année de publication : 2008 Article en page(s) : p. 4689–4696 Note générale : Bibliogr. p. 4695-4696 Langues : Anglais (eng) Mots-clés : Ammonia;  Urea  hydrolysis;  Kinetic  study Résumé : The present study is concerned with the methods and means to safely produce relatively small amounts (i.e., up to 50 kg/h) of ammonia. The equilibrium and kinetic study of urea hydrolysis was conducted in a semibatch reactor at atmospheric pressure to investigate the effects of reaction temperature, initial feed concentration, and time on ammonia production. This study reveals that conversion increases exponentially with increasing temperature but decreases slightly with increasing initial feed concentration of urea. Furthermore, the effect of time on conversion was also studied; it was found that conversion increases with increasing time. Using collision theory, the temperature dependency of the forward rate constant was determined, from which the activation energy of the reaction and the frequency factor were calculated. The activation energy and frequency factor of the urea hydrolysis reaction at atmospheric pressure were found to be 60.93 kJ/mol and 4.259 × 105 min−1, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800481z [article] Equilibrium and kinetic studies on the hydrolysis of urea for ammonia generation in a semibatch reactor [texte imprimé] / J.N. Sahu, Auteur ; K. Mahalik, Auteur ; A. V. Patwardhan, Auteur ; B. C. Meikap, Auteur . - 2008 . - p. 4689–4696. Bibliogr. p. 4695-4696 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4689–4696 Mots-clés : Ammonia;  Urea  hydrolysis;  Kinetic  study Résumé : The present study is concerned with the methods and means to safely produce relatively small amounts (i.e., up to 50 kg/h) of ammonia. The equilibrium and kinetic study of urea hydrolysis was conducted in a semibatch reactor at atmospheric pressure to investigate the effects of reaction temperature, initial feed concentration, and time on ammonia production. This study reveals that conversion increases exponentially with increasing temperature but decreases slightly with increasing initial feed concentration of urea. Furthermore, the effect of time on conversion was also studied; it was found that conversion increases with increasing time. Using collision theory, the temperature dependency of the forward rate constant was determined, from which the activation energy of the reaction and the frequency factor were calculated. The activation energy and frequency factor of the urea hydrolysis reaction at atmospheric pressure were found to be 60.93 kJ/mol and 4.259 × 105 min−1, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800481z

Hydrodynamics of a multistage countercurrent fluidized bed reactor with downcomer for lime-dolomite mixed particle system / C. R. Mohanty in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6917–6924 Titre : Hydrodynamics of a multistage countercurrent fluidized bed reactor with downcomer for lime-dolomite mixed particle system Type de document : texte imprimé Auteurs : C. R. Mohanty, Auteur ; Sivaji Adapala, Auteur ; B. C. Meikap, Auteur Année de publication : 2008 Article en page(s) : p. 6917–6924 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Fluidized  bed  reactor  Multistage  system Résumé : In the present investigation, a multistage countercurrent gas−solid fluidized bed reactor with downcomer has been proposed. The basic operating parameters have been developed illustrating the mechanism of gas−solid contacting in the system. The system was operated in three stages in series one above the other in continuous regime for a two-phase system over a wide range of operating conditions including varying the weir height in order to determine the pressure drop. The data were generated under steady and stable operation of the column. The solids holdup of the proposed multistage system is higher than the single-stage system, which results in better mass-transfer characteristics. The results in this study assume importance from the standpoint of design and steady operation of a multistage fluidized bed reactor for control of gaseous pollutants. The fluidizing gas was air, and the solid phase was a mixture of dolomite and lime in varying proportions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007693 [article] Hydrodynamics of a multistage countercurrent fluidized bed reactor with downcomer for lime-dolomite mixed particle system [texte imprimé] / C. R. Mohanty, Auteur ; Sivaji Adapala, Auteur ; B. C. Meikap, Auteur . - 2008 . - p. 6917–6924. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6917–6924 Mots-clés : Fluidized  bed  reactor  Multistage  system Résumé : In the present investigation, a multistage countercurrent gas−solid fluidized bed reactor with downcomer has been proposed. The basic operating parameters have been developed illustrating the mechanism of gas−solid contacting in the system. The system was operated in three stages in series one above the other in continuous regime for a two-phase system over a wide range of operating conditions including varying the weir height in order to determine the pressure drop. The data were generated under steady and stable operation of the column. The solids holdup of the proposed multistage system is higher than the single-stage system, which results in better mass-transfer characteristics. The results in this study assume importance from the standpoint of design and steady operation of a multistage fluidized bed reactor for control of gaseous pollutants. The fluidizing gas was air, and the solid phase was a mixture of dolomite and lime in varying proportions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007693

Influence of coal feed size on the performance of air dense medium fluidized bed separator used for coal beneficiation / Satyabrata Mohanta in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10865-10871 Titre : Influence of coal feed size on the performance of air dense medium fluidized bed separator used for coal beneficiation Type de document : texte imprimé Auteurs : Satyabrata Mohanta, Auteur ; Sudipto Chakraborty, Auteur ; B. C. Meikap, Auteur Année de publication : 2011 Article en page(s) : pp. 10865-10871 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Separator  Fluidized  bed  Fluidization  Coal Résumé : In gravity separation operation, the probability of a coal particle to appear in the product stream or in the refuse stream is a strong function of its size. Improper selection of feed size may lead to significant reduction in efficiency of the separation unit. Available literature conforms that the separation efficiency of an air dense medium fluidized bed separator, which is a gravity separation operation, decreases with feed coal size, but determination of appropriate feed size range, for efficient operation of this separator, still remains as a challenge. In this paper, the effect of feed size on the separation performance is investigated and an attempt has been made to quantify the optimum size range over which the separator can operate satisfactorily. The performance of the equipment is evaluated in two steps, namely, sharpness of separation affected by the washing unit and the efficiency of the washing operation. Predictive model equations are also proposed for describing the relation between sharpness of separation and feed size. Four Indian coal samples of different washability characteristics are considered for this investigation. Preliminary results show that the air dense medium fluidized bed separator performance is quite satisfactory for the feed coal within the 50―15 mm size range. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523904 [article] Influence of coal feed size on the performance of air dense medium fluidized bed separator used for coal beneficiation [texte imprimé] / Satyabrata Mohanta, Auteur ; Sudipto Chakraborty, Auteur ; B. C. Meikap, Auteur . - 2011 . - pp. 10865-10871. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10865-10871 Mots-clés : Separator  Fluidized  bed  Fluidization  Coal Résumé : In gravity separation operation, the probability of a coal particle to appear in the product stream or in the refuse stream is a strong function of its size. Improper selection of feed size may lead to significant reduction in efficiency of the separation unit. Available literature conforms that the separation efficiency of an air dense medium fluidized bed separator, which is a gravity separation operation, decreases with feed coal size, but determination of appropriate feed size range, for efficient operation of this separator, still remains as a challenge. In this paper, the effect of feed size on the separation performance is investigated and an attempt has been made to quantify the optimum size range over which the separator can operate satisfactorily. The performance of the equipment is evaluated in two steps, namely, sharpness of separation affected by the washing unit and the efficiency of the washing operation. Predictive model equations are also proposed for describing the relation between sharpness of separation and feed size. Four Indian coal samples of different washability characteristics are considered for this investigation. Preliminary results show that the air dense medium fluidized bed separator performance is quite satisfactory for the feed coal within the 50―15 mm size range. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523904

Multistage fluidized bed reactor performance characterization for adsorption of carbon dioxide / Sudeshna Roy in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

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Prediction of hydrodynamic properties of mixed-particle systems and theoretical analysis of loop pressure profile in a CFB unit / Mitali Das in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

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Removal of SO2 from industrial effluents by a novel twin fluid air-assist atomized spray scrubber / B. Rajmohan in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

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Voidage and pressure profile characteristics of sand-iron ore−coal−FCC single-particle systems in the riser of a pilot plant circulating fluidized bed / M. Das in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

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