Optimization of Adsorptive Storage Systems for Natural Gas

Czepirski, L.; Bałys, M. R.

doi:10.1007/978-1-4613-1375-5_27

Cited by 1 publication

(3 citation statements)

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“…virial isotherm constants carbon heat capacity methane heat capacity steel heat capacity cylinder diameter molar flux at the top of the packing total volumetric flow out of the cylinder natural convection heat transfer coefficient Henry's law constants length/height of the cylinder amount adsorbed pressure total molar flow rate out of the cylinder radial position cylinder radi us universal gas constant time temperature ambient/charge temperature volume average temperature temperature difference volume average temperature drop specific volume of gas total cylinder volume performance parameter, see equation (10) steel wall thickness axial position total packing porosity carbon density steel density effective packing conductivity dimensionless time INTRODUCTION Natural gas (NG) is an abundant, clean-burning fuel. Its major use at present is for combustion in stationary applications, such as space heating.…”

Section: Nomencla Turementioning

confidence: 99%

“…activated carbon) is packed in the vessel to increase the storage density, enabling lower-pressure operation with the same capacity. Considerable research effort has been devoted to ANG storage; fundamental molecular simulations [3][4][5][6], materials development and characterization [7][8][9][10][11][12], simulation of dynamic behavior [13][14][15], experimental measurements of performance under dynamic conditions [16][17][18], feasibility studies [19] and concept demonstrations [20]. A fairly comprehensive review of the technology and its current state is provided by Talu [2].…”

Section: Nomencla Turementioning

confidence: 99%

“…V per V = discharge gas volume at ambient conditions/ V, (10) where V is the cylinder volume; V per V is also equal to the dimensionless time in the simulations defined as…”

Section: Performance Measuresmentioning

confidence: 99%

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Behavior and performance of adsorptive natural gas storage cylinders during discharge

Chang

Talu

1996

Applied Thermal Engineering

118

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Abstract-Adsorbed natural gas (ANG) has the potential to replace compressed natural gas in mobile storage applications, such as in vehicles. Although a substantial research effort has been devoted to ANG, very few studies evaluate the impact of heat of adsorption on system performance. This paper concentrates on the impact of heat of adsorption on ANG performance during discharge, while the gas outflow rate is dictated by the energy demand of the application. The temperature drop and performance loss was measured with commercially available ANG cylinders under realistic conditions. Data show as high as a 37°C temperature drop at high discharge rate, with a performance loss approaching 25% of isothermal capacity. The performance loss is expected to be 15-20% at moderate discharge rates. Analysis of data and predictions of a simple model indicate that the ANG system is neither adiabatic nor isothermal during discharge; the thermal capacity of the vessel wall and external heat transfer conditions have a significant effect on system behavior. The poor thermal conductivity of packed adsorbent is a major obstacle for the utilization of these energy sources. Changing the flow direction during discharge from axial to radial by a perforated tube inserted at the center of the cylinder significantly reduces the performance loss by increasing the heat transfer from the wall to the central region. At intermediate discharge rates, where the inserted tube has the largest impact, the performance loss is reduced to 12% from 22% without the tube under identical conditions.

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Section: Nomencla Turementioning

confidence: 99%