The Effect of Flow Rate and Canister Geometry on the Effectiveness of Removing Carbon Dioxide with Soda Lime.
Abstract
A test installation was constructed at the Naval Postgraduate School for monitoring gas flow through a porous media bed of soda lime. The temperature, humidity, pressure and flow rates of air and carbon dioxide were controlled inputs. The exhausted fraction of carbon dioxide was measured. The ability of the soda lime in removing carbon dioxide from the incoming gas supply was determined for three cylindrical, four-inch inside-diameter canisters with length-to-diameter ratios of 1.225, 1.60 and 2.125, and for three steady flow rates of approximately 1, 2, and 3 SCFM. The canister was submerged in a constant-temperature water bath held at three levels: 40 F, 55 F and 70 F. Three inlet carbon dioxide fractions of 4.0, 6.0, and 8.0 percent by volume were used. These flow rates, geometries, fractions of carbon dioxide, and temperature ranges were selected to correspond to those experienced in actual diving operations. The measure of effectiveness used in these experiments was the time of operation before the exit carbon dioxide reached one-half percent by volume.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1979
- Accession Number
- ADA084468
Entities
People
- Calvin George Miller
Organizations
- Naval Postgraduate School