Computational fluid dynamics based model development and exergy analysis of naphtha reforming reactors

Mustafa, Jawad; Ahmad, Iftikhar; Ahsan, Muhammad; Kano, Manabu

doi:10.1504/ijex.2017.087696

Cited by 10 publications

(10 citation statements)

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“…These effects create major irreversibility and contribute significantly to the overall exergy destruction in the reactor. This trend of mixing exergy is validated by another study reported in the literature [ 17 ].…”

Section: Resultssupporting

confidence: 86%

“…Exergy is defined as the maximum amount of work obtainable when an energy carrier is brought from its initial state to a state of thermodynamic and chemical equilibrium with the environment, referred to as the dead state. Exergy can be viewed as a measure of energy usefulness or quality [ 17 ]. Exergy is consumed during real processes due to irreversibilities [ 29 ].…”

Section: Process and Exergymentioning

confidence: 99%

“…On a molar basis, physical exergy is given by the following:

where a i , b i , c i , and d i are heat capacity coefficients and R is the ideal gas constant [ 28 ]. P i and T i represent the partial pressure and temperature of individual components, respectively, at each point in the reactor [ 17 ].…”

Section: Process and Exergymentioning

confidence: 99%

“…Chemical exergy is the maximum obtainable work from a material stream by taking it from a state of thermomechanical equilibrium to a state of thermomechanical and chemical equilibrium with the environment [ 17 ]. Chemical exergy of a material stream on a molar basis is given by Equation (8):

where

is the respective stoichiometric coefficients,

is the molar Gibbs function of components i , and

is the molar Gibbs function of formation at a reference temperature and pressure [ 30 ].…”

Section: Process and Exergymentioning

confidence: 99%

“…Boulenouar and Ouadha performed a CFD-based exergy analysis of flow in a supersonic steam ejector and found that the main source of irreversibility was the nozzle due to high levels of pressure and velocity gradients [ 16 ]. Mustafa et al developed a CFD-based model for exergy analysis of naphtha reforming reactors and concluded that the total exergy of the stream increased along the reactor [ 17 ]. Alabi et al compared experimental and CFD-based exergy analysis procedures for the design optimization of the airframe subsystem of aircraft.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Model Development and Exergy Analysis of a Microreactor for the Steam Methane Reforming Process in a CFD Environment

Rahman

Ahmad

Kano

et al. 2019

Entropy

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Steam methane reforming (SMR) is a dominant technology for hydrogen production. For the highly energy-efficient operation, robust energy analysis is crucial. In particular, exergy analysis has received the attention of researchers due to its advantage over the conventional energy analysis. In this work, an exergy analysis based on the computational fluid dynamics (CFD)-based method was applied to a monolith microreactor of SMR. Initially, a CFD model of SMR was developed using literature data. Then, the design and operating conditions of the microreactor were optimized based on the developed CFD model to achieve higher conversion efficiency and shorter length. Exergy analysis of the optimized microreactor was performed using the custom field function (CFF) integrated with the CFD environment. The optimized catalytic monolith microreactor of SMR achieved higher conversion efficiency at a smaller consumption of energy, catalyst, and material of construction than the reactor reported in the literature. The exergy analysis algorithm helped in evaluating length-wise profiles of all three types of exergy, namely, physical exergy, chemical exergy, and mixing exergy, in the microreactor.

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Section: Resultssupporting

confidence: 86%

Section: Process and Exergymentioning

confidence: 99%

“…On a molar basis, physical exergy is given by the following:

Section: Process and Exergymentioning

confidence: 99%