Parametric study of sulfuric acid decomposer for hydrogen production

Ponyavin, Valery; Chen, Yitung; Mohamed, Taha; Trabia, Mohamed B.; Hechanova, Anthony; Wilson, Merrill A.

doi:10.1016/j.pnucene.2007.11.026

Cited by 13 publications

(5 citation statements)

References 4 publications

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“…The comparisons between numerical and experimental outlet temperature of co-and counter-current MCHEs at different mass flux are depicted in Figs. 3. For the co-current case (Fig.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In 1981, Tuckerman and Pease [1] first proposed the concept of using the silicon-based heat sink for electronic cooling, which resulting in intense interests in heat transfer of microchannels. Ponyavin [2,3] proposed using the ceramic MCHE as a chemical decomposer in a hydrogen production plant. They used three-dimensional computational model to study the influences of the MCHE channel geometries on the heat/flow field, chemical reaction, and stress analysis.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of Heat Transfer on Microchannel Heat Exchanger Flow Arrangement with Gas Heating

Liu

Pan

2011

AMM

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The present study investigates the effect of flow arrangement on heat transfer characteristics in two-phase microchannel heat exchangers (MCHEs) with gas heating. The microchannel heat exchangers are developed to utilize the exhaust heat from a high-temperature gas product of a methanol reformer (a part of a reformed methanol fuel cell). Co-and counter-current flow types of MCHE are tested. Working fluids in the hot and cold sides are helium and liquid methanol, respectively. For both single-phase flow regions, the experimental results indicate that the actual effectiveness of the counter-current MCHE is higher than that of the co-current MCHE. Both of the actual effectiveness of co-and counter-current MCHEs significantly increases with an increase of cold side mass flux. Moreover, the actual effectiveness for both types of MCHE is less relationship to the hot-side thermal power in single-phase zone. The highest actual effectiveness is about 0.6 and 0.72 for co-and counter-current MCHEs, respectively.

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“…The comparisons between numerical and experimental outlet temperature of co-and counter-current MCHEs at different mass flux are depicted in Figs. 3. For the co-current case (Fig.…”

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Investigation of Heat Transfer on Microchannel Heat Exchanger Flow Arrangement with Gas Heating

Liu

Pan

2011

AMM

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“…Kuchi et al [ 2 ] carried out a numerical simulation of a high-temperature shell and tube heat exchanger and decomposer, investigated the fluid flow, heat transfer, and chemical reaction processes in the decomposer by using the porous media method, and established a two-dimensional axisymmetric tubular plug-flow reactor model. Ponyavin et al [ 3 ] studied the sulfuric acid decomposer process in a high-temperature ceramic heat exchanger and established a three-dimensional calculation model of the reactor. Van der ham et al [ 4 ] further compared two methods to improve the efficiency of sulfuric acid decomposition reactor and proposed two design schemes to improve the efficiency of the reactor.…”

Section: Introductionmentioning

confidence: 99%

Minimum Entropy Generation Rate and Maximum Yield Optimization of Sulfuric Acid Decomposition Process Using NSGA-II

Sun

Xia

Chen

et al. 2020

Entropy

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Based on the theory of finite-time thermodynamics (FTT), the effects of three design parameters, that is, inlet temperature, inlet pressure, and inlet total mole flow rate, of a tubular plug-flow sulfuric acid decomposition reactor on the total entropy generation rate (EGR) and SO2 yield are analyzed firstly. One can find that when the three design parameters are taken as optimization variables, the minimum total EGR and the maximum SO2 yield of the reference reactor restrict each other, i.e., the two different performance objectives cannot achieve the corresponding extremum values at the same time. Then, the second-generation non-dominated solution sequencing genetic algorithm (NSGA-II) is further used to pursue the minimum total EGR and the maximum SO2 yield of the reference reactor by taking the three parameters as optimization design variables. After the multi-objective optimization, the reference reactor can be Pareto improved, and the total EGR can be reduced by 9% and the SO2 yield can be increased by 14% compared to those of the reference reactor. The obtained results could provide certain theoretical guidance for the optimal design of actual sulfuric acid decomposition reactors.

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“…This study determined the safety of the environment of the extreme regions of the heat exchanger for the design purpose. Ceramic shell-and-plate high temperature heat exchangers were numerically investigated in References [11,12]. The authors studied the fluid flow, heat transfer, chemical reaction, and thermal stress, aiming to improve the heat transfer performance of the heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stress and Deformation of Hollow Paddle-Shaft Components with Internal High Temperature Molten Salt Flow

2020

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Excessive thermal stress and deformation are important reasons causing disservice of high temperature heat exchangers. This paper presents thermal stress and expansion analysis of single-leaf type hollow paddle-shaft components with internal high temperature molten salt flow based on three-dimensional numerical simulations. The results show that the hollow paddles enhance the heat transfer and decrease the maximum thermal stress simultaneously with the expense of a much higher pressure drop than that of solid paddles. The cumulative von Mises stress distribution curve shows that the stress distribution of the component with hollow paddles is more uniform than that with solid paddles. The radial and axial deformations do not differ much for the components with hollow and solid paddles. A larger volume of the fluid space in the hollow paddles leads to stronger heat transfer, smaller maximum thermal stress, and more uniform stress distribution. The effects of the paddle height, the diameter and number of flow holes, the molten salt flow rate, and the material-side heat transfer coefficient are identified. The advantages of hollow paddle designs in both heat transfer and thermal stress (local and overall) performance are revealed. The work in this study can provide a reference for the design and optimization of hollow paddle heat exchangers with high temperature molten salt as working fluid.

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Parametric study of sulfuric acid decomposer for hydrogen production

Cited by 13 publications

References 4 publications

An Investigation of Heat Transfer on Microchannel Heat Exchanger Flow Arrangement with Gas Heating

An Investigation of Heat Transfer on Microchannel Heat Exchanger Flow Arrangement with Gas Heating

Minimum Entropy Generation Rate and Maximum Yield Optimization of Sulfuric Acid Decomposition Process Using NSGA-II

Thermal Stress and Deformation of Hollow Paddle-Shaft Components with Internal High Temperature Molten Salt Flow

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