Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/29935
Title: Experimental and Theoretical Studies on Adsorbed Natural Gas Storage System Using Activated Carbons
Authors: KAZI AFZALUR RAHMAN
Keywords: Adsorbed natural gas storage, Activated carbons, Cryo-isotherm, Thermal enhancement, Heat exchanger
Issue Date: 29-Jun-2011
Source: KAZI AFZALUR RAHMAN (2011-06-29). Experimental and Theoretical Studies on Adsorbed Natural Gas Storage System Using Activated Carbons. ScholarBank@NUS Repository.
Abstract: In this study, the adsorbed natural gas (ANG) storage system is investigated for enhanced storage capacity and thermal management of the adsorbent bed. The adsorption characteristics of methane, which is the major component of natural gas, onto different types of activated carbons are determined for temperatures both in sub- and supercritical ranges and pressures up to 2.5 MPa. The carbon sample type Maxsorb III provides higher adsorption capacity owing to its higher surface area and pore volume. Among the isotherm models used to describe the adsorption uptake data, the Dubinin-Astakhov (D-A) isotherm model is found to be more appropriate. The adsorption kinetics data measured for the methane/Maxsorb III pair are regressed with a modified approach of the Linear Driving Force (LDF) model that takes into account the non-isothermal behaviour of the adsorption process. The theoretical frameworks for the adsorbed phase thermodynamic properties are developed from the rigor of adsorption thermodynamics by incorporating the micropore filling theory approach, where the effect of adsorbed phase volume is considered. These adsorption characteristics and the thermodynamic analyses are useful in the study of the ANG storage system. The ANG storage system with internal thermal control based on finned type heat exchanger in the activated bed is theoretically modeled. Experiments are also performed for the prototype of the ANG system. The simulation results are in good accordance with the experimental data and it is found that the cyclic processes are notably enhanced by shortening the charge period because of the quick removal of heat of adsorption and by maximizing the gas delivery due to the heat supply to the adsorbent bed during the discharge cycle.
URI: http://scholarbank.nus.edu.sg/handle/10635/29935
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