Structure Property Relations of Carbon Nanofiber Mats: Correlation of Permeability to Surface Density

Date

2018-07-08

Journal Title

Journal ISSN

Volume Title

Publisher

48th International Conference on Environmental Systems

Abstract

Carbon capture filters are vital for closing the loop on Hydrogen in several processes under consideration by NASA including Plasma Pyrolysis. The carbon generation rate for the Plasma Pyrolysis process has been demonstrated to be very small but still significant for missions of extended or indefinite duration. For certain deep space applications it may be feasible to engineer a carbon capture filtration system that does not require media regeneration, given the duration period and carbon generation rate. Such a filter will always be larger than a filter that can be periodically regenerated. For a fair comparison, the launch mass and volume footprint of a small filter that requires periodic regeneration to satisfy mission requirements must include mass and volume of the associated auxiliary hardware and other materials. When the LSE (life support envelope) operates as a thermodynamically closed system, provisions must also be made for the storage of the generated byproducts of the regeneration process. In addition, it will be necessary to understand the limitations imposed on a filter that will require periodic regeneration, along with the potential for irreversible clogging also known as the ‘slow death of the media phenomenon’. It is anticipated that the permeability of the carbon cakes that will form on the surface of any carbon capture filter will be orders of magnitude lower that the permeability of the filter media, and will be the limiting resistance that will determine frequency of regeneration that will be required by the smallest filter, or the size of the filter that that can meet mission requirements without regeneration. This paper provides a foundation for a larger effort to engineer the optimum carbon capture filter and to understand technical and econometric trade-offs between small filters that require media regeneration and larger filters that do not require media regeneration.

Description

Nicos Andreas, N.H. Andreas Co. Inc.
Christopher Cox, Clemson University
Apparao Rao, Clemson University
Masaaki Tamura, Fuji Filter Manufacturing Co., Ltd.
Katsuji Azuma, Fuji Filter Manufacturing Co., Ltd.
ICES302: Physio-chemical Life Support- Air Revitalization Systems -Technology and Process Development
The 48th International Conference on Environmental Systems was held in Albuquerque, New Mexico, USA on 08 July 2018 through 12 July 2018.

Keywords

Regenerable Cross Flow Filter, Carbon Capture, Deep Space Application, Metal Filter Media

Citation