Mathematical modelling of the solar-driven steam reforming of methanol for a solar thermochemical micro-fluidized bed reformer: thermal performance and thermochemical conversion

Dias, Vitória da Fonseca; Silva, Jornandes Dias da

doi:10.1007/s40430-020-02529-6

Cited by 22 publications

(19 citation statements)

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“…To make these processes sustainable, not only must the feedstocks be renewable, but also the energy needed to the process should be sustainable too. For this reason, solar [83,84], wind and geothermal energy represent an interesting alternative to conventional methods, which, however, are feasible where cost savings are demonstrated. In a recent study a geothermal-assisted methanol reforming, incorporating a proton exchange membrane fuel cell, for hydrogen production, has been proposed [85].…”

Section: Remarks On Thermal Methodsmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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Due to its characteristics, hydrogen is considered the energy carrier of the future. Its use as a fuel generates reduced pollution, as if burned it almost exclusively produces water vapor. Hydrogen can be produced from numerous sources, both of fossil and renewable origin, and with as many production processes, which can use renewable or non-renewable energy sources. To achieve carbon neutrality, the sources must necessarily be renewable, and the production processes themselves must use renewable energy sources. In this review article the main characteristics of the most used hydrogen production methods are summarized, mainly focusing on renewable feedstocks, furthermore a series of relevant articles published in the last year, are reviewed. The production methods are grouped according to the type of energy they use; and at the end of each section the strengths and limitations of the processes are highlighted. The conclusions compare the main characteristics of the production processes studied and contextualize their possible use.

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Section: Remarks On Thermal Methodsmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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“…The two reforming reactions, Equations (5) and (7), are highly endothermic reactions and they need high temperatures to obtain a high H 2 productivity. On the other hand, Equation (6) is a slightly exothermic reaction and it works at low temperature when comparing to Equations (5) and (7).…”

Section: Srm : Chmentioning

confidence: 99%

“…The global rate equations of the three reactions, Equations (5)- (7), are based on the Langmuir-Hinshelwood kinetic model [3]. The kinetic rates from Equations (5)-(7) are considered more general for nickel (Ni) catalyst and, therefore, the equations of the SRM method are presented as:…”

Section: Srm : Chmentioning

confidence: 99%

“…The key idea for the coupled integral equations approximation (CIEA) has been reported using the Hermite approach [7]. The mathematical model of this work is built by a system of NPDEs for the heat transfer and mass transfer of the SRM method in PBMR.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

“…The Pd-based dense membrane can act as a remover and it facilitates the selective removal of the gaseous molecule of H 2 . The removal of H 2 through Pd-based dense membrane shifts the equilibrium of reforming reactions to the chosen direction according to the Le Chatelier principle [7][8][9]. PBMRs offer many potential advantages such as enhanced conversion of hydrocarbons, reduced cost, improved yield, and high selectivity.…”

Section: Introductionmentioning

confidence: 99%

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Thermochemical Performance Analysis of the Steam Reforming of Methane in a Fixed Bed Membrane Reformer: A Modelling and Simulation Study

Medeiros¹,

Dias²,

Silva³

et al. 2020

Membranes

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Pd-based membrane reformers have been substantially studied in the past as a promising reformer to produce high-purity H2 from thermochemical conversion of methane (CH4). A variety of research approaches have been taken in the experimental and theoretical fields. The main objective of this work is a theoretical modelling to describe the process variables of the Steam Reforming of Methane (SRM) method on the Pd-based membrane reformer. These process variables describe the specific aims of each equation of the mathematical model characterizing the performance from reformer. The simulated results of the mole fractions of components (MFCs) at the outlet of the Fixed Bed Reformer (FBR) and Packed-Bed Membrane Reformer (PBMR) have been validated. When the H2O/CH4 ratio decreases in PBMR, the Endothermic Reaction Temperature (ERT) is notably increased (998.32 K) at the outlet of the PBMR’s reaction zone. On the other hand, when the H2O/CH4 ratio increases in PBMR, the ERT is remarkably decreased (827.83 K) at the outlet of the PBMR’s reaction zone. An increase of the spatial velocity (Ssp) indicates a reduction in the residence time of reactant molecules inside PBMR and, thus, a decrease of the ERT and conversion of CH4. In contrast, a reduction of the Ssp shows an increase of the residence time of reactant molecules within PBMR and, therefore, a rise of the ERT and conversion of CH4. An increase of the H2O/CH4 ratio raises the conversion rate (CR) of CH4 due to the reduction of the coke content on the catalyst particles. Conversely, a reduction of the H2O/CH4 ratio decreases the CR of CH4 owing to the increase of the coke content on the catalyst particles. Contrary to the CR of CH4, the consumption-based yield (CBY) of H2 sharply decreases with the increase of the H2O/CH4 ratio. An increase of the ERT raises the thermochemical energy storage efficiency (ηtese) from 68.96% (ERT = 1023 K), 63.21% (ERT = 973 K), and 48.12% (ERT = 723 K). The chemical energy, sensible heat, and heat loss reached values of 384.96 W, 151.68 W, and 249.73 W at 973 K. The selectivity of H2 presents higher amounts in the gaseous mixture that varies from 60.98 to 73.18 while CH4 showed lower values ranging from 1.41 to 2.06. Our work is limited to the SRM method. In terms of future uses of this method, new works can be undertaken using novel materials (open-cell foams) and the physical-mathematical model (two-dimensional and three-dimensional) to evaluate the concentration polarization inside membrane reactors.

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Inverse analysis applying the Levenberg–Marquardt method for simultaneously estimating parameters of the adsorption of CO2 on activated carbon in a fixed-bed adsorber

Silva¹

2022

J Braz. Soc. Mech. Sci. Eng.

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Mathematical modelling of the solar-driven steam reforming of methanol for a solar thermochemical micro-fluidized bed reformer: thermal performance and thermochemical conversion

Cited by 22 publications

References 86 publications

Main Hydrogen Production Processes: An Overview

Main Hydrogen Production Processes: An Overview

Thermochemical Performance Analysis of the Steam Reforming of Methane in a Fixed Bed Membrane Reformer: A Modelling and Simulation Study

Inverse analysis applying the Levenberg–Marquardt method for simultaneously estimating parameters of the adsorption of CO2 on activated carbon in a fixed-bed adsorber

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