Assessment of an Equivalent Reaction Networks Approach for Premixed Combustion

Amzin, Shokri; Cant, RS

doi:10.1080/00102202.2015.1059329

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…The ERN approach was formulated in 1953 by [12] and later enhanced by [15]. The framework was used to several combustion problems, such as turbulent premixed flames [16], boilers [15,17,18], swirling flames [19], industrial burners [20,21], and gas turbine combustors [22][23][24]. The main aim of the method is to simplify the turbulent flow behaviour to lower the involved computational cost without reducing the computational accuracy.…”

Section: The Equivalent Reaction Network (Ern) Methodsmentioning

confidence: 99%

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Computations of a Bluff-Body Stabilised Premixed Flames Using ERN Method

Amzin

2022

ChemEngineering

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Combustible carbon-based energy is still prevailing as the world’s leading energy due to its high energy density. However, the oxidation of these hydrocarbons disturbs the natural carbon cycle greatly by increasing greenhouse gases. As emission legislation becomes more rigorous, lean premixed combustion becomes promising because it can reduce nitrogen oxides (NOx) and Carbon Monoxide (CO) emissions without compromising efficiency. However, utilising lean premixed flames in industrial combustors is not easy because of its thermo-acoustic instabilities associated with pressure fluctuations and the non-linearity in the mean reaction rate. Therefore, reliable predictive combustion models are required to predict emissions with sensible computational costs to use the mode efficiently in designing environmentally friendly combustion systems. Along with the promising methodologies capable of modelling turbulent premixed flames with low computational costs is the ERN-RANS framework. Thus, this study aims to compute a bluff-body stabilised premixed flames close to blow-Off using the ERN-RANS framework. As a result, a satisfactory agreement is reached between the predicted and measured values.

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Section: The Equivalent Reaction Network (Ern) Methodsmentioning

confidence: 99%

“…The computations of the ERN are conducted using an in-house reactor network research code [16]. The calculation of temperature and species mass fractions are acquired by solving the transport equation for the reactor using the open-source solver CANTERA [30].…”

Section: Computational Detailsmentioning

confidence: 99%

Computations of a Bluff-Body Stabilised Premixed Flames Using ERN Method

Amzin

2022

ChemEngineering

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“…To ensure the right balance between the acceptable level of accuracy and reasonable time of execution, equivalent reactor network (ERN) modeling has emerged as a numerical tool , that can simulate nonideal chemical reactors and efficiently allow their monitoring, control, and optimization. Indeed, ERN models have been successfully applied to the modeling of many chemical processes taking place in complex vessels and reactors. − As for the FCC process, a CFD-based ERN model for a pilot-scale FCC riser reactor has been recently developed . The main finding of the work was that the average error on the product yields computed at the riser outlet using the CFD-based ERN model was 4.7% in comparison with an error of 12.8% obtained using a plug-flow model.…”

Section: Introductionmentioning

confidence: 99%

Novel Integrated Reactor-Regenerator Model for the Fluidized Catalytic Cracking Unit Based on an Equivalent Reactor Network

Sun

Berrouk

et al. 2019

Energy Fuels

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Fluidized catalytic cracking (FCC) is the most used process for converting heavy oil into more valuable fuels and chemical products such as gasoline and propylene. The conventional steady state and dynamic models that have commonly been used to study FCC units assume simple plug flow in the riser reactor and two-region (i.e., freeboard and dense bed)twophase (i.e., bubble phase and emulsion phase) in the catalyst regenerator. As a remedy to the limited accuracy yielded by such assumptions, an integrated model based on the equivalent reactor network (ERN) approach is built in order to accurately model a pilot-scale residue FCC (RFCC) unit. The model involves 8-reactor and 10-reactor networks to characterize complex hydrodynamics within the regenerator and the riser reactor, respectively. Also, a coke combustion kinetic model and a ten-lump kinetic model describing the cracking reactions, as well as the necessary thermodynamic models, are coupled with the ERN hydrodynamic models. The validation of the integrated models shows good agreement with available experimental data. The model is subsequently used to investigate the effects of operating conditions such as reaction temperature, residence time, and catalyst-to-oil ratio on the product yield distribution in the RFCC unit. Finally, the model is used to demonstrate the superiority of the RFCC-Maxing-Propylene process over the conventional RFCC process. It is believed that the developed model can help researchers and engineers carry out further RFCC process investigations such as dynamic analysis and real-time control and optimization.

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On the Non-Equilibrium Behavior of Fuel-Rich Hydrocarbon/Air Combustion Within Perfectly Stirred Reactors

Celis

Silva

2016

Combustion Science and Technology

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The origins of non-equilibrium behavior observed, even for relatively large residence times, in perfectly stirred reactors (PSRs) burning fuel rich mixtures, are addressed. These PSR deviations from chemical equilibrium are characterized by using PSR-based results of CO/O2 reacting mixtures. Accordingly, the origins of the PSR non-equilibrium behavior are elucidated by (i) analyzing the relevance of the reaction steps involved in the CO/O2 kinetic mechanism, (ii) deriving and assessing analytical expressions reproducing the PSR results, and (iii) examining asymptotic limit solutions emphasizing a possible cause of the non-equilibrium behavior observed. The main results highlight that the PSR non-equilibrium behavior is controlled by a competition between (i) the rate of progress variable backward component of the CO + O + M ⇌ CO2 + M reaction and (ii) the ratio between the reactor inlet O2 molar concentration and the reactor residence time. Thus, even when the reactor is operating in a region of temperature invariance (plateau), where chemical equilibrium conditions could be presumed, there are some chemical species, such as O2 and O, whose steady state does not correspond to that of chemical equilibrium. It is concluded then that particular attention should be paid when analyzing PSR results, obtained at relatively high mixture equivalence ratios, which may not correspond to equilibrium, in situations where it could be presumed to happen so. A brief discussion on the extent of such non-equilibrium phenomena is performed as well using more complex syngas/O2 mixtures.

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Assessment of an Equivalent Reaction Networks Approach for Premixed Combustion

Cited by 4 publications

References 41 publications

Computations of a Bluff-Body Stabilised Premixed Flames Using ERN Method

Computations of a Bluff-Body Stabilised Premixed Flames Using ERN Method

Novel Integrated Reactor-Regenerator Model for the Fluidized Catalytic Cracking Unit Based on an Equivalent Reactor Network

On the Non-Equilibrium Behavior of Fuel-Rich Hydrocarbon/Air Combustion Within Perfectly Stirred Reactors

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