Conclusion
In this experiment counter- current and co-current flow configurations were used, and it was determined that for equal feed rates and compression, the result showed that the counter-current flow mode resulted in an exponential decrease in permeate fraction with relationship to increasing flow rate; Likewise, co-current flow had the same relationship. It was determined that the O2% in the NEA stream is lower for counter-current flow for each corresponding stage cut. Moreover, the complete mixing model assumes no concentration gradient along the fibers. The complete mixing model shows a trend of level, to slightly increasing, permeate fraction of the feed as flow increases. A higher flowrate of NEA or lower oxygen in the NEA feed increase the ability to decrease oxygen within the ullage at a faster rate. Therefore, this method is more desirable because of higher cost savings. SO, it would be most advantageous to minimize the size of the compressor as this would minimize the power input to the system, as the separator has no direct power needs and therefore no additional costs with increasing size. The proposed ground based inerting system design that was derived from the experiment utilizes a YNEA=0.01 at 1277 L/min through 48 separator modules using an 44 MW compressor. Higher residence time leads to consuming higher power in compressors due to the higher flowrates.