290490 Innovative Air Cleaning For Fuel Cells Using Microfibrous Entrapped Sorbent and Composite Bed Design
Innovative Air Cleaning For Fuel Cells Using Microfibrous
Entrapped Sorbent and Composite Bed Design
Guomin Xu and Bruce Tatarchuk
Department of Chemical Engineering, Auburn University, Auburn, AL
Fuels cell can be poisoned by some molecular contaminants such as H2S, NH3, COS, CO, VOCs at quite low concentration ranging from ppb to ppm levels. Current packed bed sorbent/catalyst bed has a tradeoff between removal efficiency (stack tolerance to the poison) and pressure drop (stack net output). In order to improve the performance of the air cleaning systems, a set of new technology consisting of microfibrous entrapped sorbent (MFES), multi-element structured array (MESA) and polish layer sorbent was developed. Various variables including removal efficiency, pressure drop, protection time, weight and volume, and form flexibility were considered to estimate the performance of filters. MFES has much higher heterogeneous contacting efficiency than packed bed, which make it has 5-log removal efficiency with a thin (1mm) layer media. The MESA can retain over 10-fold more sorbent than packed bed. The large capacity and large media area of MESA can significantly increase gas protection time while reducing filter’s pressure drop. A polish layer is a very thin MFES media, just put following the packed bed to polish the trace volume of gas. A polish layer can improve the removal efficiency of packed bed and increase the utilization of bed.
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