scholarly journals An Enhanced Sherwood Number to Model the Hydrogen Transport in Membrane Steam Reformers

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 805
Author(s):  
Maria Anna Murmura ◽  
Chiara Rocchetti ◽  
Maria Cristina Annesini
Keyword(s):  
Sherwood Number ◽  
Gas Flow ◽  
Operating Conditions ◽  
Membrane Reactors ◽  
Methane Steam Reforming ◽  
Concentration Gradients ◽  
Methane Steam ◽  
Simplifying Assumptions ◽  
1D Model ◽  
Steam Reformers

It is well known that membrane reactors are inherently two-dimensional systems in which species concentrations vary as a consequence of both the reaction and permeation across the membrane, which occurs in the direction perpendicular to that of the main gas flow. Recently, an expression for an enhanced Sherwood number was developed to describe the hydrogen concentration gradients arising in methane steam-reforming membrane reactors as a consequence of the combined effect of hydrogen production, dispersion, and permeation. Here, the analysis is developed in further detail with the aim of (i) assessing the validity of the simplifying assumptions made when developing the 1D model and (ii) identifying the operating conditions under which it is possible to employ the 1D model with the enhanced Sherwood number.

Methane steam reforming in asymmetric Pd- and Pd-Ag/porous SS membrane reactors

1994 ◽  
Vol 119 (2) ◽  
pp. 305-325 ◽  
Author(s):  
Jun Shu ◽  
Bernard P.A. Grandjean ◽  
Serge Kaliaguine
Keyword(s):  
Steam Reforming ◽  
Membrane Reactors ◽  
Methane Steam Reforming ◽  
Methane Steam

Reaction rate profiles in long palladium membrane reactors for methane steam reforming

Desalination ◽  
2008 ◽  
Vol 233 (1-3) ◽  
pp. 359-366 ◽  
Author(s):  
Shigeki Hara ◽  
Kenji Haraya ◽  
Giuseppe Barbieri ◽  
Enrico Drioli
Keyword(s):  
Steam Reforming ◽  
Reaction Rate ◽  
Membrane Reactors ◽  
Methane Steam Reforming ◽  
Palladium Membrane ◽  
Methane Steam

The Validity of the Compressible Reynolds Equation for Gas Lubricated Textured Parallel Slider Bearings

2012 ◽  
Author(s):  
Mingfeng Qiu ◽  
Brian Bailey ◽  
Rob Stoll ◽  
Bart Raeymaekers
Keyword(s):  
Gas Flow ◽  
Reynolds Equation ◽  
Stokes Equations ◽  
Hydrodynamic Lubrication ◽  
Operating Conditions ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Slider Bearings ◽  
Simplifying Assumptions ◽  
Simulation Results

The Navier-Stokes and compressible Reynolds equations are solved for gas lubricated textured parallel slider bearings under hydrodynamic lubrication for a range of realistic texture geometry parameters and operating conditions. The simplifying assumptions inherent in the Reynolds equation are validated by comparing simulation results to the solution of the Navier-Stokes equations. Using the Reynolds equation to describe shear driven gas flow in textured parallel slider bearings is justified for the range of parameters considered.

Advances on methane steam reforming to produce hydrogen through membrane reactors technology: A review

2016 ◽  
Vol 58 (1) ◽  
pp. 1-35 ◽  
Author(s):  
Adolfo Iulianelli ◽  
Simona Liguori ◽  
Jennifer Wilcox ◽  
Angelo Basile
Keyword(s):  
Steam Reforming ◽  
Membrane Reactors ◽  
Methane Steam Reforming ◽  
Methane Steam

Stable equilibrium shift of methane steam reforming in membrane reactors with hydrogen-selective silica membranes

AIChE Journal ◽  
2010 ◽  
Vol 57 (7) ◽  
pp. 1882-1888 ◽  
Author(s):  
Kazuki Akamatsu ◽  
Takuya Murakami ◽  
Takashi Sugawara ◽  
Ryuji Kikuchi ◽  
Shin-ichi Nakao
Keyword(s):  
Steam Reforming ◽  
Stable Equilibrium ◽  
Membrane Reactors ◽  
Methane Steam Reforming ◽  
Silica Membranes ◽  
Methane Steam ◽  
Equilibrium Shift

Dynamic Modeling of Nuclear Hydrogen Production Using Methane Steam Reforming

2021 ◽  
Author(s):  
Junyi Li ◽  
Zhe Dong ◽  
Bowen Li
Keyword(s):  
Hydrogen Production ◽  
Dynamic Modeling ◽  
Steam Reforming ◽  
Nuclear Power ◽  
Thermal Power ◽  
Open Loop ◽  
Membrane Reactors ◽  
Methane Steam Reforming ◽  
Production Plant ◽  
Methane Steam

Abstract Methane steam reforming (MSR) technology is one of the promising methods of hydrogen production and already available at an industrial scale, in which steam is added to methane to generate hydrogen. MSR carries out at a temperature of 500°C when catalysts and Pd-based membrane reactors are used. The nuclear steam supply system (NSSS) of a modular high-temperature gas-cooled reactor (MHTGR) can provide high-quality steam of around 570°C, which is an excellent heat source for MSR. MHTGR is a typical small modular reactor (SMR), of which the coolant is helium, and the moderator and structural material are graphite. The number of the MHTGR can be decided based on the thermal power required for MSR and electricity generation. In this paper, a six-modular MHTGR nuclear power plant with 1500MW thermal power coupled with the MSR process is designed. The hydrogen production rate is 9.72 tons per hour. The dynamic modeling is based on conservation laws of mass and energy. To examine the dynamic characteristics of the nuclear hydrogen production plant, open-loop responses of the model under different disturbances are presented.

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