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ANN modelling of the steam reforming of naphthalene based on non-stoichiometric thermodynamic analysis

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Abstract

Naphthalene is a major component of tar whose formation is a technical barrier in gasification systems. It can be used for hydrogen production via the steam reforming process. In this study, artificial neural network was used to model the steam reforming of naphthalene. The dataset will be developed by non-stoichiometric computation of the minimisation of Gibbs free energy method. The effect of temperature and steam-to-oil ratio (STOR) on the selectivity of hydrogen gas, carbon dioxide, carbon monoxide and methane in the product stream was investigated. Temperature and STOR increase favoured H2 production in the steam reforming process. At the threshold of temperature > 600° C and STOR > 4 kg/kg, optimal H2 selectivity is achieved. The coefficient of determination and root mean squared error for the model for all regimes (training, validation and testing) and all synthesis gas constituents was > 0.99 and < 1 mol%, respectively. Parity plots revealed that the predictions were accurate at both high and low levels of prediction. Paired samples correlation revealed a strong positive correlation between model predictions and the experimental values. The current approach is unfavourable in scenarios where quick predictions and preliminary estimations are required other investigations in product and process development.

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Abbreviations

a li :

Number of gram atoms of element l in 1 mol of species i

b l :

Total number of gram atoms of element l in the reaction mixture

G :

Gibbs free energy (kJ/mol)

\(\Delta H_{r}^{0}\) :

Change in enthalpy of reaction

\(\Delta G_{i}^{0}\) :

Standard Gibbs free energy of the formation of species i (kJ/mol)

K :

Total number of chemical species in the reaction mixture

m :

Total number of atomic elements

n :

Total number of moles of all species in the gas mixture (mol)

n i :

Number of moles of species i (mol)

P :

Pressure (bar and atm)

R :

Gas constant (J/mol K)

R 2 :

Coefficient of determination

T :

Temperature (°C or K)

μ i :

Chemical potential of species i (kJ/mol)

y i :

Mole fraction of species i

ANN:

Artificial neural networks

ASPEN:

Advanced systems for process engineering

L–M:

Levenberg–Marquardt

MLP:

Multilayer perceptron

MSE:

Mean square error

nftool:

Neural fitting tool

RMSE:

Root mean square error

SPSS:

Statistical package for the social sciences

SRK:

Soave–Redlich–Kwong equation of state

STOR:

Steam-to-oil mass ratio (kg/kg)

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Correspondence to Joshua O. Ighalo.

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Igwegbe, C.A., Adeniyi, A.G. & Ighalo, J.O. ANN modelling of the steam reforming of naphthalene based on non-stoichiometric thermodynamic analysis. Chem. Pap. 75, 3363–3372 (2021). https://doi.org/10.1007/s11696-021-01566-2

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  • DOI: https://doi.org/10.1007/s11696-021-01566-2

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