A heterogeneous dynamic model for the simulation and optimisation of the steam methane reforming reactor

Pantoleontos, G.; Kikkinides, Eustathios S.; Georgiadis, Michael C.

doi:10.1016/j.ijhydene.2012.02.125

Cited by 108 publications

(68 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…No radial gradients in the bed; this is a valid assumption as long as the reaction scheme is not exothermic. [8] Furthermore, simulation has been performed by Lindborg [9] for the SMR process in a fixed bed reactor with different tube inner diameters, i.e. 0.1145 m, 0.2290 m, 0.3435 m, and 0.4580 m. It has been found that radial gradient increases with the increase of reactor diameter.…”

Section: Pseudo-homogeneous Fixed Bed Reactor Modelmentioning

confidence: 99%

“…[6,68,8] Hence, it is seen that the SMR process is a diffusion limited process with very low effectiveness factors (less than 0.03). The Á 2 value has an asymptote at z=2.2 m. Following the analysis of Xu and Froment, [6] Pantoleontos et al [8] and Pedernera et al [69] found that this discontinuity is due to the change of the water gas shift reaction's direction. As the effectiveness factor values of the SMR process are in close agreement with the literature values, it is assumed that the conventional heterogeneous model is the best choice for the SMR process.…”

Section: Comparison Of Pseudo-homogeneous Conventional Heterogeneousmentioning

confidence: 99%

“…[8] It has been found that when increasing the size, the effectiveness factor decreases, as well as the bed pressure dropping. Generally, the particles are large enough so that the pressure drop is small, which leads to high mass transfer resistances in the particles.…”

mentioning

confidence: 99%

See 2 more Smart Citations

A numerical study of fixed bed reactor modelling for steam methane reforming process

Rout

Jakobsen

2015

Can J Chem Eng

View full text Add to dashboard Cite

A numerical comparison of the pseudo-homogeneous, conventional heterogeneous, and simplified heterogeneous reactor models is performed for the steam methane reforming process. The pseudo-homogeneous reactor model consists of a set of partial differential equations, where the diffusional limitations are accounted for by considering the effectiveness factor. The heterogeneous model is divided into two categories: conventional and simplified heterogeneous models. In the conventional heterogeneous model, there are separate equations for the fluid phase species mass balance, the fluid inside the catalyst pores. This is type of reactor model is needed when there is a considerable amount of interphase mass transfer resistance present in the process. However, in the simplified heterogeneous reactor model the mass transport phenomenon is accounted for by accounting the efficiency factors. The model is validated against literature data. Several closures for the intra-particle mass diffusion fluxes, the Maxwell-Stefan, Wilke, dusty gas, and Wilke-Bosanquet models, have been compared on the level of the catalyst pellet and the impacts of the different particle flux closures on the reactor performance are investigated.The simulations show that the conventional heterogeneous reactor model is necessary for the SMR process, because the effectiveness factor values of different reactions of the SMR process vary along the reactor axis. The maximum deviation between the pseudo-homogeneous and the conventional heterogeneous reactor model is less than 38 %, whereas between the conventional and simplified heterogeneous reactor models it is less than 21 %. A parametric study of the transport phenomena on the pellet level is recommended prior to any large-scale reactor simulation to determine what the rate-determining transport mechanisms are.

show abstract

Section: Pseudo-homogeneous Fixed Bed Reactor Modelmentioning

confidence: 99%

Section: Comparison Of Pseudo-homogeneous Conventional Heterogeneousmentioning

confidence: 99%

See 1 more Smart Citation

A numerical study of fixed bed reactor modelling for steam methane reforming process

Rout

Jakobsen

2015

Can J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Key assumptions of the tube gas phase model are: ideal gas law is used for approximations [16], radial variations in the reformer tubes are negligible [17,18] , the conditions of one tube represent the other tubes as well, a pre-reformer converts 2 + hydrocarbons into methane, hydrogen or carbon monoxide, so heavier-than-methane hydrocarbons are neglected in this model, and the steam/carbon ratio is high enough such that carbon deposition will not happen in the reformer [19].…”

Section: 4tube Gas Phasementioning

confidence: 99%

Modeling and simulation of an integrated steam reforming and nuclear heat system

Hoseinzade

Adams

2017

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

The following article is a "pre-print" of an article accepted for publication in an Elsevier journal.Hoseinzade L, Adams TA II. Modeling and simulation of an integrated steam reforming and nuclear heat system. International Journal of Hydrogen Energy 42 (2017) pp. 25048-25062The pre-print is not the final version of the article. It is the unformatted version which was submitted for peer review, but does not contain any changes made as the result of reviewer feedback or any editorial changes. Therefore, there may be differences in substance between this version and the final version of record.The final, official version of the article can be downloaded from the journal's website via this DOI link when it becomes available (subscription or purchase may be required): AbstractIn this study, a dynamic and two-dimensional model for a steam methane reforming process integrated with nuclear heat production is developed. The model is based on first principles and considers the conservation of mass, momentum and energy within the system. The model is multiscale, considering both bulk gas effects as well as spatial differences within the catalyst particles. Very few model parameters need to be fit based on the design specifications reported in the literature. The resulting model fits the reported design conditions of two separate pilot-scale studies (ranging from 0.4 to 10 MW heat transfer duty). A sensitivity analysis indicated that disturbances in the helium feed conditions significantly affect the system, but the overall system performance only changes slightly even for the large changes in the value of the most uncertain parameters.

show abstract

“…Thus, the actual composition of the outflow leaving the steam reformer is a factor of the reactor temperature and operating pressure as well as the composition of the feed gas [28]. In order to produce more amount of hydrogen, carbon monoxide and steam take part in the reversible exothermic water gas shift reaction.…”

Section: Steam Reformermentioning

confidence: 99%

Dynamic Analysis of Load Operations of Two-Stage SOFC Stacks Power Generation System

Pianko‐Oprych

Hosseini

2017

Energies

View full text Add to dashboard Cite

Abstract:The main purpose of this paper was to develop a complete dynamic model of a power generation system based on two serially connected solid oxide fuel cell stacks. The uniqueness of this study lies in a different number of fuel cells in the stacks. The model consists of the electrochemical model, mass and energy balance equations implemented in MATLAB Simulink environment. Particular attention has been paid to the analysis of the transient response of the reformers, fuel cells and the burner. The dynamic behavior of the system during transient conditions was investigated by load step changing. The model evaluates electrical and thermal responses of the system at variable drawn current. It was found that a decrease of 40% in the 1st stage and 2nd solid oxide fuel cell (SOFC) stacks drawn current caused both stacks temperature to drop by 2%. An increase of the cell voltage for the 1st and 2nd SOFC stacks led to very fast steam reformer response combined with a slight decrease in reformer temperature, while a considerable burner temperature increase of 70 K can be observed. Predictions of the model provide the basic insight into the operation of the power generation-based SOFC system during various transients and support its further design modifications.

show abstract

A heterogeneous dynamic model for the simulation and optimisation of the steam methane reforming reactor

Cited by 108 publications

References 86 publications

A numerical study of fixed bed reactor modelling for steam methane reforming process

A numerical study of fixed bed reactor modelling for steam methane reforming process

Modeling and simulation of an integrated steam reforming and nuclear heat system

Dynamic Analysis of Load Operations of Two-Stage SOFC Stacks Power Generation System

Contact Info

Product

Resources

About