Design of a composite sulfuric acid decomposition reactor, concentrator, and preheater for hydrogen generation processes

Connolly, Sarah; Zabolotny, Ernest R.; McLaughlin, David F.; Lahoda, Edward J.

doi:10.1016/j.ijhydene.2008.07.126

Cited by 26 publications

(10 citation statements)

References 5 publications

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“…Zhang et al 40 conducted a series experiments of sulfuric acid decomposition and showed that the sulfur trioxide decomposition is strongly affected by the fluid temperature and weight hourly space velocity (WHSV). For present catalyzer arrange and reactant mass flow, WHSV keeps a low value around 16.68 h −1 compared with the decomposition experiment measurement from 10 to 70 h −1 by Zhang et al 40 Thus, corresponding reactions can be considered to achieve equilibrium state approximatively and reaction equilibrium constant can be calculated by Equation (11). The temperature distribution in the sulfuric acid in the decomposition zone was used to estimate the sulfur trioxide decomposition rate in the porous medium region according to Equation (11).…”

Section: Sulfuric Acid Tube Sidementioning

confidence: 69%

“…For present catalyzer arrange and reactant mass flow, WHSV keeps a low value around 16.68 h −1 compared with the decomposition experiment measurement from 10 to 70 h −1 by Zhang et al 40 Thus, corresponding reactions can be considered to achieve equilibrium state approximatively and reaction equilibrium constant can be calculated by Equation (11). The temperature distribution in the sulfuric acid in the decomposition zone was used to estimate the sulfur trioxide decomposition rate in the porous medium region according to Equation (11). Figure 12 shows the decomposition predictions around the different tube bundles at three heights.…”

Section: Sulfuric Acid Tube Sidementioning

confidence: 69%

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Numerical study of heat transfer and sulfuric acid decomposition in the process of hydrogen production

et al. 2019

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Summary The sulfuric acid decomposer is the key equipment of the iodine‐sulfur cycle to achieve hydrogen production utilizing high temperature of very high‐temperature gas‐cooled reactor (VHTR). This study discusses sulfuric acid decomposer design and pipeline layout to improve the performance of the sulfuric acid decomposer based on a shell‐and‐tube heat exchanger with a bayonet heat exchanger as the core. The finite volume method was used to numerically calculate the heat transfer, temperature distribution, baffle layout, and sulfur trioxide decomposition rate in the sulfuric acid decomposer. The results show that the convective heat transfer coefficient of the fully developed section of the sulfuric acid decomposer for the given conditions is about 10 W·m−2·K−1 and the average temperature of the sulfuric acid in the catalyst region is about 1040 K. For the design, the inlet manifold plate effectively distributes the inlet helium, while the staggered baffles in the shell and tube heat exchanger increase the heat transfer area and improve the helium distribution to enhance the heat transfer. The prediction shows that the sulfur trioxide decomposition rate is about 60% in the catalyst region under design VHTR condition, which is in agreement with experimental measurement under corresponding temperature and space velocity. The results provide a reference for the design of sulfuric acid decomposers for VHTR.

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Section: Sulfuric Acid Tube Sidementioning

confidence: 69%

Section: Sulfuric Acid Tube Sidementioning

confidence: 69%

Numerical study of heat transfer and sulfuric acid decomposition in the process of hydrogen production

et al. 2019

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“…Different concepts to bring in heat into an endothermic chemical process like the decomposition of sulphuric acid have been discussed and comparatively evaluated in past by different groups (Gelbard et al, 2005;General Atomics, 1985;Connolly et al, 2007). Those concepts differ with respect to the way of coupling the chemical process to the energy source.…”

Section: H 2 So 4 Decomposersmentioning

confidence: 99%

HycycleS: a project on nuclear and solar hydrogen production by sulphur-based thermochemical cycles

Roeb

Thomey

Graf

et al. 2011

IJNHPA

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Abstract:The European FP7 project HycycleS focuses on providing detailed solutions for the design of specific key components for sulphur-based thermochemical cycles for hydrogen production. The key components necessary for the high temperature part of those processes, the thermal decomposition of H 2 SO 4 , are a compact heat exchanger for SO 3 decomposition for operation by solar and nuclear heat, a receiver-reactor for solar H 2 SO 4 decomposition, and membranes as product separator and as promoter of the SO 3 decomposition. Silicon carbide has been identified as the preferred construction material. Its stability is tested at high temperature and in a highly corrosive atmosphere. Another focus is catalyst materials for the reduction of SO 3 . Requirement specifications were set up as basis for design and sizing of the intended prototypes. Rigs for corrosion tests, catalyst tests and selectivity of separation membranes have been designed, built and completed. Prototypes of the mentioned components have been designed and tested.Keywords: sulphur; catalyst; silicon carbide; membranes; thermochemical cycle.Reference to this paper should be made as follows: Roeb, M., Thomey, D., Graf, D., Sattler, C., Poitou, S., Pra, F., Tochon, P., Mansilla, C., Robin, J-C., Le Naour, F., Allen, R.W.K., Elder, R., Atkin, I., Karagiannakis, G., Agrafiotis, C., Konstandopoulos, A.G., Musella, M., Haehner, P., Giaconia, A., Sau, S., Tarquini, P., Haussener, S., Steinfeld, A., Martinez, S., Canadas, I., Orden, A., Ferrato, M., Hinkley, J., Lahoda, E. and Wong, B. (2011) 'HycycleS: a project on nuclear and solar hydrogen production by sulphur-based thermochemical cycles ', Int. J. Nuclear Hydrogen Production and Applications, Vol. 2, No. 3, Sabine Poitou studied Chemical Engineering at ENSIC (Ecole Nationale Supérieure des Industries Chimiques) in the National Polytechnic Institute of Lorraine (1991Lorraine ( -1994. Working at the CEA since 1998 as Research Engineer, she was involved on nuclear waste treatment and conditioning studies until 2007. Since 2008, her activity has concentrated on industrial development of hydrogen production with nuclear reactor coupled processes. George Karagiannakis received his PhD in Chem. Eng., at the Aristotle Univ. of Thessaloniki, Greece. He has been an Affiliated Researcher at APTL since 2006 and a member of the Nanoparticles and Catalysts Group. He has expertise in catalytic and electrocatalytic studies, with emphasis in those involving hydrogen productions. He has participated in several national and EU research projects.Christos Agrafiotis is a Principal Researcher at CPERI, Chemical Engineer. He received his PhD in Chem. Eng., from SUNY, Buffalο, USΑ. He has more than 15 years of expertise in powder synthesis and catalytic coating of monolithic reactors, participated in several EU-and nationally-funded research projects in these areas, and he is the author of more than 40 relevant publications in international journals and proceedings. Athanasios Konstandopoulos is the Director of APTL and C...

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“…The results were obtained under unsteady state conditions involving variation of temperature and pressure and the effect on conversion. A bayonet type decomposer was successfully constructed, modelled and validated by Nagarajan et al [22] using a catalyst consisting of 1 wt.% platinum supported on silica at pressures of 1e5 bar and an inlet temperature of 923 K. Connolly et al [23] designed a multistage decomposer consisting of a combined bayonet type reactor system with pre-heating, concentrating and decomposition of sulphuric acid. Regarding solar heated reactors a number of solar reactors have been modelled and evaluated experimentally.…”

Section: Introductionmentioning

confidence: 99%

Sulphur trioxide decomposition with supported platinum/palladium on rutile catalyst: 2. Performance of a laboratory fixed bed reactor

Stander

Everson

Neomagus

et al. 2015

International Journal of Hydrogen Energy

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Design of a composite sulfuric acid decomposition reactor, concentrator, and preheater for hydrogen generation processes

Cited by 26 publications

References 5 publications

Numerical study of heat transfer and sulfuric acid decomposition in the process of hydrogen production

Numerical study of heat transfer and sulfuric acid decomposition in the process of hydrogen production

HycycleS: a project on nuclear and solar hydrogen production by sulphur-based thermochemical cycles

Sulphur trioxide decomposition with supported platinum/palladium on rutile catalyst: 2. Performance of a laboratory fixed bed reactor

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