Most recent issue published online in the International Journal of Nuclear Hydrogen Production and Applications.
International Journal of Nuclear Hydrogen Production and Applications
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International Journal of Nuclear Hydrogen Production and Applications
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© 2016 Inderscience Enterprises Ltd.
© 2016 Inderscience Publishers Ltd
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International Journal of Nuclear Hydrogen Production and Applications
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http://www.inderscience.com/browse/index.php?journalID=141&year=2016&vol=3&issue=1
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Modelling of membrane reactor for hydrogen production by HI decomposition: studies on catalyst activity and non-isothermality in packed bed and coated wall configurations
http://www.inderscience.com/link.php?id=78423
The objective of this work was to assess the impact of deviations from isothermality in packed bed and coated wall membrane reactors on the rates of HI decomposition. A two-dimensional modelling was done for a packed bed membrane reactor as well as a coated wall membrane reactor for HI decomposition. The smaller diameter reactor showed higher apparent catalyst activity. The reactivity results showed that the reactors suffered from significant temperature gradients. We estimated the diameter required for packed bed and coated wall membrane reactors to achieve near isothermal operation. The coated wall reactor gives lower conversion than the packed bed reactor. The model confirmed that the measured catalyst activities in different diameter reactors varied due to heat transfer and pressure drop effects.
Modelling of membrane reactor for hydrogen production by HI decomposition: studies on catalyst activity and non-isothermality in packed bed and coated wall configurations
Nitesh Goswami; Soumitra Kar; R.C. Bindal; P.K. Tewari
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 1 - 11
The objective of this work was to assess the impact of deviations from isothermality in packed bed and coated wall membrane reactors on the rates of HI decomposition. A two-dimensional modelling was done for a packed bed membrane reactor as well as a coated wall membrane reactor for HI decomposition. The smaller diameter reactor showed higher apparent catalyst activity. The reactivity results showed that the reactors suffered from significant temperature gradients. We estimated the diameter required for packed bed and coated wall membrane reactors to achieve near isothermal operation. The coated wall reactor gives lower conversion than the packed bed reactor. The model confirmed that the measured catalyst activities in different diameter reactors varied due to heat transfer and pressure drop effects. ]]>
10.1504/IJNHPA.2016.078423
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 1 - 11
Nitesh Goswami
Soumitra Kar
R.C. Bindal
P.K. Tewari
Desalination Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India ' Desalination Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India ' Desalination Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India ' Desalination Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
hydrogen production
energy
packed bed membrane reactors
thermochemical cycles
iodine sulphur process
reactor modelling
hydrogen iodide decomposition
catalyst activity
non-isothermality
coated wall membrane reactors
temperature gradients
heat transfer
pressure drop
2016-08-17T23:20:50-05:00
Copyright © 2016 Inderscience Enterprises Ltd.
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Study of Bunsen reaction in agitated reactor operating in counter current mode for iodine-sulphur thermo-chemical process
http://www.inderscience.com/link.php?id=78424
The iodine-sulphur (IS) thermo-chemical process is being studied as a potential process for production of hydrogen by water splitting. It consists of three chemical reactions: 1) Bunsen reaction, which is the acid production step, 2) sulphuric acid decomposition to produce oxygen; 3) hydrogen iodide decomposition to produce hydrogen. In this work, a detailed parametric study of the Bunsen reaction is presented, which was carried out in agitated reactor (ABR) in counter current mode of operation. Experiments have been carried out in the reactor at different temperatures by varying the sulphur dioxide (SO<SUP align="right">2</SUP>) flow rate and partial pressure of SO<SUP align="right">2</SUP>. Bunsen reaction rate and SO<SUP align="right">2</SUP> conversion are calculated experimentally from feed rate and scrubbing rate of SO<SUP align="right">2</SUP>. It has been observed that the reaction rate and SO<SUP align="right">2</SUP> conversion increase with increase in SO<SUP align="right">2</SUP> flow, increase in SO<SUP align="right">2</SUP> partial pressure and decrease in temperature. 'Tanks-in-series' model, one of the non-ideal reactor models, has been proposed to describe the ABR reaction system. The model has been validated with experimental results. This approach can be useful for the design and scaling up of the agitated reactor.
Study of Bunsen reaction in agitated reactor operating in counter current mode for iodine-sulphur thermo-chemical process
A. Shriniwas Rao; S. Sujeesh; Nafees A. Vakil; H.Z. Fani; A. Sanyal; P.K. Tewari; L.M. Gantayet
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 12 - 31
The iodine-sulphur (IS) thermo-chemical process is being studied as a potential process for production of hydrogen by water splitting. It consists of three chemical reactions: 1) Bunsen reaction, which is the acid production step, 2) sulphuric acid decomposition to produce oxygen; 3) hydrogen iodide decomposition to produce hydrogen. In this work, a detailed parametric study of the Bunsen reaction is presented, which was carried out in agitated reactor (ABR) in counter current mode of operation. Experiments have been carried out in the reactor at different temperatures by varying the sulphur dioxide (SO<SUP align="right">2</SUP>) flow rate and partial pressure of SO<SUP align="right">2</SUP>. Bunsen reaction rate and SO<SUP align="right">2</SUP> conversion are calculated experimentally from feed rate and scrubbing rate of SO<SUP align="right">2</SUP>. It has been observed that the reaction rate and SO<SUP align="right">2</SUP> conversion increase with increase in SO<SUP align="right">2</SUP> flow, increase in SO<SUP align="right">2</SUP> partial pressure and decrease in temperature. 'Tanks-in-series' model, one of the non-ideal reactor models, has been proposed to describe the ABR reaction system. The model has been validated with experimental results. This approach can be useful for the design and scaling up of the agitated reactor.]]>
10.1504/IJNHPA.2016.078424
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 12 - 31
A. Shriniwas Rao
S. Sujeesh
Nafees A. Vakil
H.Z. Fani
A. Sanyal
P.K. Tewari
L.M. Gantayet
Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Engineering Group, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Beam Technology Development Group, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India
iodine-sulphur process
thermo-chemical cycle
heterogeneous Bunsen reaction
continuous stirred tank reactors
CSTR
plug flow reactors
PFR
agitated Bunsen reactors
ABR
average reaction rate
hydrogen production
water splitting
sulphuric acid decomposition
hydrogen iodide decomposition
modelling
2016-08-17T23:20:50-05:00
Copyright © 2016 Inderscience Enterprises Ltd.
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2016-08-17T23:20:50-05:00
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Efficiency of a conceptual design of a high temperature electrolysis system coupled to a VHTR for nuclear hydrogen production
http://www.inderscience.com/link.php?id=78433
High temperature electrolysis process coupled to a very high temperature reactor is one of the most promising methods for hydrogen production using a nuclear reactor as the primary energy source. A computational fluid dynamic model for the evaluation and optimisation of the electrolyser of a high temperature electrolysis hydrogen production process flowsheet was developed using ANSYS FLUENT®. Electrolyser's operational and design parameters will be optimised in order to obtain the maximum hydrogen production and the higher efficiency in the module. A complete flowsheet is proposed for the high temperature electrolysis process coupled to an accelerator driven system, considering a Brayton cycle for the energy production and a sweep gas system for the gas separation. An acceptable value of global efficiency for the initial operating condition is obtained. Several parametric studies are conducted using the flowsheet proposed to evaluate important operating parameters in the overall process efficiency.
Efficiency of a conceptual design of a high temperature electrolysis system coupled to a VHTR for nuclear hydrogen production
Daniel González RodrÃguez; Carlos Alberto Brayner de Oliveira Lira; Lázaro GarcÃa Parra; Carlos GarcÃa Hernández; Raciel De la Torre Valdés
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 32 - 64
High temperature electrolysis process coupled to a very high temperature reactor is one of the most promising methods for hydrogen production using a nuclear reactor as the primary energy source. A computational fluid dynamic model for the evaluation and optimisation of the electrolyser of a high temperature electrolysis hydrogen production process flowsheet was developed using ANSYS FLUENT®. Electrolyser's operational and design parameters will be optimised in order to obtain the maximum hydrogen production and the higher efficiency in the module. A complete flowsheet is proposed for the high temperature electrolysis process coupled to an accelerator driven system, considering a Brayton cycle for the energy production and a sweep gas system for the gas separation. An acceptable value of global efficiency for the initial operating condition is obtained. Several parametric studies are conducted using the flowsheet proposed to evaluate important operating parameters in the overall process efficiency. ]]>
10.1504/IJNHPA.2016.078433
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 32 - 64
Daniel González RodrÃguez
Carlos Alberto Brayner de Oliveira Lira
Lázaro GarcÃa Parra
Carlos GarcÃa Hernández
Raciel De la Torre Valdés
Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Ave. Prof. Luiz Freire, 1000, 50740-420 Recife, PE, Brazil; Instituto Superior de TecnologÃas y Ciencias Aplicadas (InSTEC/Cuba), Av. Salvador Allende and Luaces, La Habana, Cuba ' Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Ave. Prof. Luiz Freire, 1000, 50740-420 Recife, PE, Brazil ' Instituto Superior de TecnologÃas y Ciencias Aplicadas (InSTEC/Cuba), Av. Salvador Allende and Luaces, La Habana, Cuba ' Instituto Superior de TecnologÃas y Ciencias Aplicadas (InSTEC/Cuba), Av. Salvador Allende and Luaces, La Habana, Cuba ' Instituto Superior de TecnologÃas y Ciencias Aplicadas (InSTEC/Cuba), Av. Salvador Allende and Luaces, La Habana, Cuba
high temperature electrolysis
HTE
nuclear hydrogen production
electrolyser efficiency
computational fluid dynamics
CFD
conceptual design
VHTR
very high temperature reactors
modelling
Brayton cycle
sweep gas system
gas separation
2016-08-17T23:20:50-05:00
Copyright © 2016 Inderscience Enterprises Ltd.
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Effect of agitation speed and fluid velocity on heat transfer performance in agitated Bunsen reactor of iodine-sulphur thermo-chemical cycle
http://www.inderscience.com/link.php?id=78425
Agitated Bunsen reactor (ABR) is one of the reactor alternatives to carry out Bunsen reaction of iodine-sulphur thermo-chemical process for hydrogen production. It is a tubular reactor with multiple agitating blades on a common shaft to enhance the radial mixing and with an inside helical coil arrangement to remove the exothermic Bunsen reaction heat. The effective heat removal from the reactor depends on the agitation speed and velocity of fluids flowing inside the reactor and through the helical coil. Experiments are carried out in ABR, for heat transfer study with water as reactor fluid as well as helical coil fluid and also Bunsen reaction heat transfer study, by varying the operating parameters such as agitation speed, velocity of reactor fluid and velocity of helical coil fluid. It has been observed that the overall heat transfer coefficient increases with increase in agitation speed and fluid velocities. Combined effect of agitation speed and fluid velocities on heat transfer rate, in shell side/reactor side of ABR, has been presented in the form of modified correlation.
Effect of agitation speed and fluid velocity on heat transfer performance in agitated Bunsen reactor of iodine-sulphur thermo-chemical cycle
A. Shriniwas Rao; S. Sujeesh; A. Sanyal; P.K. Tewari; L.M. Gantayet
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 65 - 79
Agitated Bunsen reactor (ABR) is one of the reactor alternatives to carry out Bunsen reaction of iodine-sulphur thermo-chemical process for hydrogen production. It is a tubular reactor with multiple agitating blades on a common shaft to enhance the radial mixing and with an inside helical coil arrangement to remove the exothermic Bunsen reaction heat. The effective heat removal from the reactor depends on the agitation speed and velocity of fluids flowing inside the reactor and through the helical coil. Experiments are carried out in ABR, for heat transfer study with water as reactor fluid as well as helical coil fluid and also Bunsen reaction heat transfer study, by varying the operating parameters such as agitation speed, velocity of reactor fluid and velocity of helical coil fluid. It has been observed that the overall heat transfer coefficient increases with increase in agitation speed and fluid velocities. Combined effect of agitation speed and fluid velocities on heat transfer rate, in shell side/reactor side of ABR, has been presented in the form of modified correlation.]]>
10.1504/IJNHPA.2016.078425
International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 65 - 79
A. Shriniwas Rao
S. Sujeesh
A. Sanyal
P.K. Tewari
L.M. Gantayet
Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Chemical Engineering Group, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India ' Beam Technology Development Group, Bhabha Atomic Research Centre (BARC), Mumbai-400085, India
Bunsen reaction
agitated Bunsen reactors
ABR
heat transfer coefficient
helical coil
iodine-sulphur process
agitation speed
fluid velocity
thermo-chemical cycle
hydrogen production
2016-08-17T23:20:50-05:00
Copyright © 2016 Inderscience Enterprises Ltd.
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79
2016-08-17T23:20:50-05:00