Sensitivity analysis of tubular packed‐bed reactor by pseudohomogeneous 2–D model

Juncu, Gheorghe; Floarea, Octavian

doi:10.1002/aic.690411211

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…The sensitivity coefficients can be calculated based on the local sensitivity analysis (Morbidelli and Varma, 1988, Vajda and Rabitz, 1992, Tildem et al, 1981, Juncu and Floarea, 1995. Indicating any of the reactor parameters [Pe C , Pe T , B C , γ, B T and β T ] as φ, the first-order sensitivity coefficient of Y, with Y being y 1 and y 2 , is defined as,…”

Section: The System Governing and Sensitivity Equationsmentioning

confidence: 99%

Optimal measurement locations for parameter estimation of non linear distributed parameter systems

Alaña

2010

Braz. J. Chem. Eng.

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-A sensor placement approach for the purpose of accurately estimating unknown parameters of a distributed parameter system is discussed. The idea is to convert the sensor location problem to a classical experimental design. The technique consists of analysing the extrema values of the sensitivity coefficients derived from the system and their corresponding spatial positions. This information is used to formulate an efficient computational optimum experiment design on discrete domains. The scheme studied is verified by a numerical example regarding the chemical reaction in a tubular reactor for two possible scenarios; stable and unstable operation conditions. The resulting approach is easy to implement and good estimates for the parameters of the system are obtained. This study shows that the measurement location plays an essential role in the parameter estimation procedure.

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Section: The System Governing and Sensitivity Equationsmentioning

confidence: 99%

Optimal measurement locations for parameter estimation of non linear distributed parameter systems

Alaña

2010

Braz. J. Chem. Eng.

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“…This method has already been used on several types of systems: catalytic tubular reactors, [7][8][9][10][11][12] cooled reactors, 13,14 continuous-stirred tank reactors, 6 batch reactors, 15 and thermal explosion theory. 6,16 Various works have been published in the literature dealing with model predictions [13][14][15][16][17][18][19][20][21][22] and a few experimental studies have been carried out. [23][24][25][26][27] The studies related to parametric sensitivity are generally based on simple reactions, but some authors considered complex reactions and refer to the influence of yield and selectivity on thermal runaway.…”

Section: Introductionmentioning

confidence: 99%

“…However, Morbidelli and Varma have proposed a new generalized criterion for parametric sensitivity based on the sensitivity coefficient of the hot spot temperature to the model input parameters. This method has already been used on several types of systems: catalytic tubular reactors, − cooled reactors, , continuous-stirred tank reactors, batch reactors, and thermal explosion theory. , Various works have been published in the literature dealing with model predictions − and a few experimental studies have been carried out. − The studies related to parametric sensitivity are generally based on simple reactions, but some authors considered complex reactions and refer to the influence of yield and selectivity on thermal runaway. ,, Most of the work developed before the 70s was carried out by using pseudo-homogeneous models. However, the studies presented by McGreavy and Adderley revealed that the heterogeneity of the catalytic reactors must be considered in the analysis of the parametric sensitivity of a system.…”

Section: Introductionmentioning

confidence: 99%

Thermal Runaway Conditions of a Partially Diluted Catalytic Reactor

Quina

Ferreira

1999

Ind. Eng. Chem. Res.

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The generalized parametric sensitivity criterion was used to obtain runaway diagrams for oneand two-dimensional heterogeneous models and a one-dimensional pseudo-homogeneous model. The simulation work was based on the partial methanol oxidation to formaldehyde, which occurs in a fixed-bed reactor, with two distinct catalytic zones. At the inlet of the reactor, the catalyst was diluted with inert packing followed by a region with pure catalyst. This activity profile induces a reduction in the parametric sensitivity of the process to temperature runaway, when compared to a uniform activity bed, and the sensitivity functions reach a minimum when the inlet temperature is in the range of 530-540 K. The dilution of the catalytic bed leads to an enlargement of the stable region of operation, which allows a gain in the critical methanol concentration of 20% for a feed temperature of 530 K (industrial operating temperature), higher gains being possible (∼40%) for higher inlet temperatures. Moreover, depending on the particular set of the operating conditions, one or two hot spots can be developed, one in each zone of the bed, it being important to follow both because one or the other can determine the critical conditions of the system. The additional mass flux by intraparticle convection leads to an increase in the parametric sensitivity when compared with the case where diffusion is the only mechanism taken into account.

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Sensitivity analysis of the methane catalytic combustion in a sintered metal reactor with integrated heat exchanger

Juncu

Brouwer

Mulder

1996

Chemical Engineering Science

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Sensitivity analysis of tubular packed‐bed reactor by pseudohomogeneous 2–D model

Cited by 3 publications

References 25 publications

Optimal measurement locations for parameter estimation of non linear distributed parameter systems

Optimal measurement locations for parameter estimation of non linear distributed parameter systems

Thermal Runaway Conditions of a Partially Diluted Catalytic Reactor

Sensitivity analysis of the methane catalytic combustion in a sintered metal reactor with integrated heat exchanger

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