Potential Impacts of CF3I on Ozone as a Replacement for CF3BR in Aircraft Applications.
Potential Impacts of CF3I on Ozone as a Replacement for
CF3BR in Aircraft Applications.
(663 K)
Li, Y.; Wuebbles, D. J.
Paper 05; HOTWC 2005;
Halon Options Technical Working Conference, 15th
Proceedings. HOTWC 2005. Sponsored by: 3M Specialty
Materials, Boeing, Chemical Development Studies, Inc.,
DuPont Fire Extinguishants, Halon Alternative Research
Corp., Hughes Associates, Inc., Kidde-Fenwal, Inc.,
Sandia National Laboratories, SEVO Systems, Next
Generation Fire Suppression Technology Program. May
24-26, 2005, Albuquerque, NM, 1-8 pp, 2005.
Sponsor:
National Institute of Standards and Technology,
Gaithersburg, MD
Keywords:
halon alternatives; halons; halon 1301; ozone; aircraft
fuels; fire fighting; emissions; inerting; nacelle
engines; military aircraft; sensitivity analysis; fire
extinguishing agents; chemical reactions; iodine;
aircraft engines; thermal reactions
Abstract:
CF3I has been considered to be a candidate replacement
of CF3Br used in aircraft for fuel inerting and for fire
fighting. In this study, the chemical effects of
aircraft released CF3I on atmospheric ozone were
examined with the current UIUC 2D Chemical Transport
Model (CTM). Using the former estimate of aircraft
emission profile for tank inerting in military aircraft
as used in the resulting equivalent ODPs for CF3I were
in the range of 0.07 to 0.25, above the critical value
0.05, the U.S. EPA for policy consideration. As a
sensitivity analysis, we analyzed a case with emissions
associated with inerting occurring at lower altitudes.
This case resulted in much lower ODPs. Finally, we
analyzed the potential effects on ozone resulting from
using CF3I in fire fighting connected with engine
nacelle and auxiliary power unit applications. The
resulting effects on ozone showed extremely low ODPs <
0.05. The altitudes where most of aircraft released CF3I
occurs seemed to be a dominant factor in its ozone
depletion effects.
