Hydrogenation of CO/CO2 mixtures under unsteady-state conditions: Effect of the carbon oxides on the dynamic methanation process

The Power-to-Gas (PtG) process offers the opportunity to store fluctuating renewable energy in form of chemical energy by hydrogenating carbon oxides into methane. In addition, potential carbon point sources often consist of CO/CO2 (COx) mixtures. Hence, reactor design requires kinetic models valid for unsteady-state operation and a broad spectrum of feed gas compositions. In order to provide the required experimental data basis for derivation of kinetic expressions valid under transient conditions, the dynamic response of a continuously operated fixed-bed methanation reactor is studied by applying periodic step-changes in the feed composition. The obtained results are evaluated based on a simple reactor model, providing the molar flow rate exchanged between the gas bulk and the solid surface for CO, CO2, CH4, and H2O. The results further reveal that the transient kinetic processes at the catalyst surface strongly affect the reactor response under reaction conditions of technical relevance.

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Two Dimensional Unsteady State Mathematical Model for dispersion of Chlorine in Water in a Channel

Indian Journal Of Applied Research ◽

10.15373/2249555x/aug2013/158 ◽

2011 ◽

Vol 3 (8) ◽

pp. 503-505

Author(s):

Jaipal Jaipal ◽

◽

Rakesh Chandra Bhadula ◽

V. N Kala V. N Kala

Keyword(s):

Mathematical Model ◽

Two Dimensional ◽

Unsteady State

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HEAT TRANSFER PECULIARITIES IN HETEROGENEOUS SYSTEMS WITH HIGH UNSTEADY-STATE HEAT TRANSFER RATES

10.1615/ihtc4.980 ◽

1970 ◽

Author(s):

N.V. Antonishin ◽

S. S. Zabrodsky ◽

L.E. Simchenko ◽

V.V. Lushchikov

Keyword(s):

Heat Transfer ◽

Heterogeneous Systems ◽

Unsteady State ◽

Transfer Rates ◽

State Heat

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UNSTEADY-STATE HEAT TRANSFER INVESTIGATION BY METHODS OF SOLVING THERMAL CONDUCTIVITY REVERSE PROBLEMS

10.1615/ihtc5.1250 ◽

1974 ◽

Author(s):

E. Tourilina ◽

I. T. Aladyev ◽

K. Voskresensky

Keyword(s):

Heat Transfer ◽

Thermal Conductivity ◽

Unsteady State ◽

State Heat

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EVALUATION OF A NON-INTERACTIVE BUNDLE-OF-TUBES MODEL FOR CALCULATION OF UNSTEADY-STATE RELATIVE PERMEABILITIES WITH LABORATORY MEASUREMENTS

Journal of Porous Media ◽

10.1615/jpormedia.2020034821 ◽

2020 ◽

Vol 23 (12) ◽

pp. 1167-1186

Author(s):

Walid Mohamed Mahmud ◽

Xiaolong Yin ◽

Mansur Ermila

Keyword(s):

Unsteady State ◽

Laboratory Measurements ◽

Relative Permeabilities

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QUANTITATIVE DETERMINATIONS OF CARBON OXIDES IN ATMOSPHERE BY ABSORBTION SPECTRA

Environmental Engineering and Management Journal ◽

10.30638/eemj.2012.268 ◽

2012 ◽

Vol 11 (12) ◽

pp. 2159-2162

Author(s):

Iuliana Caraman ◽

Oxana Racovet ◽

Dumitru Untila ◽

Silvia Evtodiev ◽

Marius Stamate

Keyword(s):

Carbon Oxides

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Approximate analysis of the containment of contaminated sites prior to remediation

Water Science & Technology ◽

10.2166/wst.2000.0332 ◽

2000 ◽

Vol 42 (1-2) ◽

pp. 319-324 ◽

Cited By ~ 1

Author(s):

H. Rubin ◽

A. Rabideau

Keyword(s):

Steady State ◽

Peclet Number ◽

Dimensionless Parameter ◽

Contaminated Sites ◽

Unsteady State ◽

Péclet Number ◽

Vertical Barrier ◽

Time Period ◽

Barrier Performance ◽

Vertical Barriers

This study presents an approximate analytical model, which can be useful for the prediction and requirement of vertical barrier efficiencies. A previous study by the authors has indicated that a single dimensionless parameter determines the performance of a vertical barrier. This parameter is termed the barrier Peclet number. The evaluation of barrier performance concerns operation under steady state conditions, as well as estimates of unsteady state conditions and calculation of the time period requires arriving at steady state conditions. This study refers to high values of the barrier Peclet number. The modeling approach refers to the development of several types of boundary layers. Comparisons were made between simulation results of the present study and some analytical and numerical results. These comparisons indicate that the models developed in this study could be useful in the design and prediction of the performance of vertical barriers operating under conditions of high values of the barrier Peclet number.

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