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Development of a system of natural gas storage governed by simultaneous processes of adsorption–desorption

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Abstract

A system for natural gas storage was developed where energy effects involved in adsorption and desorption were combined through two concentric cylinders containing equal masses of activated carbon. The storage operating cycle was performed using methane feeding (compression/adsorption) in the internal cylinder, while simultaneously methane discharging (decompression/desorption) in the external cylinder. The charge and discharge operations were evaluated using the barometric technique at 298 K under storage pressures of 10, 30 and 60 bar, with flow rates of 1.14 × 10−3, 5.13 × 10−3 and 9.09 × 10−3 m3/min. The coaxial storage system provided faster pressure and temperature evolution toward equilibrium. A 50 % increase in the mass of gas stored under 60 bar was obtained when compared with the single storage tank.

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Abbreviations

d c,int :

Internal diameter of storage tank (m)

h c :

Height of storage tank (m)

m AC :

Mass of activated carbon (kg)

n ads CH4 :

Number of methane molecules adsorbed (mol)

n f,CH4 :

Number of moles of methane fed (mol)

n micro,CH4 :

Number of moles trapped in the micropores (mol)

n ext :

Number of moles compressed in the mesopores and macropores, and in the free space of the reservoir (mol)

q* CH4 :

Adsorbed methane at equilibrium

q IC CH4 , q ES CH4 , q ST CH4 :

Amount of adsorbed methane in the internal cylinder, external cylinder, single tank (kg/kg)

M :

Molar mass of the gas (kg/mol)

P :

Pressure (bar)

Q :

Flow rate (m3/min)

Q IC V/V , Q ES V/V , Q ST V/V :

Volumetric storage capacity in the internal cylinder, external cylinder, single tank (m3/m3)

T :

Temperature (K)

V S :

Specific volume of the adsorbent (m3/kg)

V P :

Specific pore volume (m3/kg)

V micro :

Specific volume of the micropores (m3/kg)

V micro,Q :

Specific volume of gas filled at the micropores (m3/kg)

Z :

Compressibility factor

ρ pc :

Packing density (kg/m3)

\(\varepsilon\) :

Porosity of the activated carbon

\(\varepsilon \underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{s}\) :

Storage efficiency

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Acknowledgments

We would like to acknowledge PPEQ/UFPE and CNPq, Brazil for the financial support to this project.

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Authors and Affiliations

  1. Department of Chemical Engineering, Federal University of Pernambuco, Avenida Prof. Artur de Sá s/n, Recife, PE, 50740-520, Brazil

    Rodrigo G. Martins, Deivson C. S. Sales, Nelson M. Lima Filho & Cesar A. M. Abreu

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  1. Rodrigo G. Martins
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  2. Deivson C. S. Sales
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  3. Nelson M. Lima Filho
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  4. Cesar A. M. Abreu
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Correspondence to Cesar A. M. Abreu.

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Martins, R.G., Sales, D.C.S., Lima Filho, N.M. et al. Development of a system of natural gas storage governed by simultaneous processes of adsorption–desorption. Adsorption 21, 523–531 (2015). https://doi.org/10.1007/s10450-015-9691-7

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  • DOI: https://doi.org/10.1007/s10450-015-9691-7

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