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Research Papers: Air Emissions From Fossil Fuel Combustion

Experimental and Numerical Investigation of La2NiO4 Membranes for Oxygen Separation: Geometry Optimization and Model Validation

[+] Author and Article Information
Mohamed A. Habib, Rached Ben-Mansour, Khaled Mezghani, Zeeshan Alam

KACST TIC#32-753,
KACST and Department of
Mechanical Engineering,
KFUPM,
Dhahran 31261, Saudi Arabia

Pervez Ahmed

KACST TIC#32-753,
KACST and Department of
Mechanical Engineering,
KFUPM,
Dhahran 31261, Saudi Arabia
e-mail: pervezahmed@kfupm.edu.sa

Y. Shao-Horn, A. F. Ghoniem

Department of Mechanical Engineering,
Massachusetts Institute of Technology,
77 Massachusetts Avenue,
Cambridge, MA 02139

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 15, 2014; final manuscript received December 28, 2014; published online February 26, 2015. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 137(3), 031102 (May 01, 2015) (12 pages) Paper No: JERT-14-1294; doi: 10.1115/1.4029670 History: Received September 15, 2014; Revised December 28, 2014; Online February 26, 2015

The present work aims at developing a computational model for the prediction of oxygen separation through La2NiO4 disk shaped membranes. The influence of oxygen concentration on the permeation rate was studied experimentally. The model has been validated by comparing the numerical results with those of experiments. The optimal diameter of the inner tube for sweep gas and its distance (gap height) from the membrane surface for maximum oxygen permeation has been investigated. For the present geometry, the optimum gap height (P) is in the range of 0.85–1.25 mm and the optimum diameter (Di) is in the range of 1.5–2.5 mm. Finally it is concluded, as indicated by the numerical and experimental investigations, that with increase in the ratio of O2/N2 mixture on the feed side the oxygen permeation rate increases.

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References

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Figures

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Fig. 1

Experimental setup for testing membrane oxygen permeation

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Fig. 2

Geometry of the experimental setup used for modeling

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Fig. 3

Validation against experimental results of Xu and Thomson [7]

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Fig. 4

Effect of gap height P on oxygen permeation rates

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Fig. 5

Effect of gap height P on the mole fraction distribution of helium gas at a distance of 1 mm from the membrane surface along the length of the ITM on permeate side

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Fig. 6

Effect of gap height P on the velocity magnitude at a distance of 1 mm from the membrane surface along the length of the ITM on permeate side

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Fig. 7

Effect of gap height P on the average velocity at a distance of 1 mm from the surface of ITM on permeate side

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Fig. 8

Contours of velocity (m/s) vectors for increasing P values

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Fig. 9

Effect of gap height P on the oxygen flux on the permeate side of the ITM

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Fig. 10

Effect of inner diameter Di on oxygen permeation rates

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Fig. 11

Effect of Di on the mole fraction distribution of helium gas at a distance of 1 mm from the membrane surface along the length of the ITM on permeate side

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Fig. 12

Effect of Di on the velocity magnitude at a distance of 1 mm from the membrane surface along the length of the ITM on permeate side

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Fig. 13

Effect of parameter Di on average velocity at a distance of 1 mm from the surface of ITM on permeate side

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Fig. 14

Contours of velocity vectors (m/s) for increasing Di values

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Fig. 15

Effect of Di on the oxygen flux at a distance of 1 mm from the membrane surface along the length of the ITM on permeate side

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Fig. 16

Effect of parameter Di on pressure at a distance of 1 mm from the surface of ITM on permeate side

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Fig. 17

Comparison of oxygen flux for different O2/N2 mixtures

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Fig. 18

Velocity vector for the case 4 for P = 1 mm and Di = 2 mm

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Fig. 19

Oxygen permeation flux on the permeate side of the ITM for increasing ratios of O2/N2 mixture

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Fig. 20

Mass fraction of O2 on the permeate side of the ITM (closest node next to the wall) for increasing ratios of O2/N2 mixture

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Fig. 21

Mole fraction of O2 along the axial line for varying O2/N2 fractions

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Fig. 22

Mole fraction of O2 on feed and permeate sides along the center line for P = 1 mm and Di = 2 mm

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Fig. 23

Contours of mass fractions of O2 for five different cases of O2/N2 mixture for P = 1 mm and Di = 2 mm

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