Abstract
ABSTRACT In this research, we evaluated the possibility of using hollow fibre membranes combined with a VOC recovery system to recover high-capacity of VOCs in crude oil loading conditions. We initially investigated the performance of a basic membrane module under various conditions, and then developed and tested a large-scale membrane system. The ranges of conditions were determined based on practical and operational environments in terminals and tankers. The results of the basic membrane module experiment indicated that the recovery ratio of a multi-hydrocarbon mixture gas, in contrast to that of single hydrocarbon gases, increases proportionally with an increase in flow rate up to a point and then decreases in a curvilinear manner. Our findings demonstrate the strong dependence of VOC recovery ratio on the pressure and flow rate, while the influence of temperature is less significant. A large-scale membrane test was then conducted based on the optimised conditions of the basic membrane module, and the total recovery ratio between flow rates of 500 (N m3)/h and 1000 (N m3)/h were compared. This study demonstrates the possibility of utilising membranes for large-scale VOC separation and the necessity for further research to minimise recovery losses due to membrane module enlargement and moisture intrusion.
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