Entrance effect and gas-film mass-transfer coefficient in a large-diameter packed column
The effects of the bed height and the entrance section below the packing support on mass transfer in a 1.2-m diameter packed bed of 50-mm ceramic Intalox saddles were investigated under various gas flow rates from 1,957 to 7,828 kg/h {sm_bullet}m{sup 2} and liquid flow rates from 12,200 to 46,700 kg/h {sm_bullet}m{sup 2}. The entrance effect accounted for 17% of the overall water vapor transferred from moist air to a calcium chloride solution in the tower, regardless of the packing height. For a 0.91-m high bed, the average mass-transfer coefficient was directly proportional to the gas rate and was proportional to the liquid rate to the power of 0.24. For a 1.8-m high bed, the average mass-transfer coefficient was proportional to the gas rate to the power of 0.89 and appeared to be independent of the liquid rate. The height of a transfer unit (HTU) for 50-mm ceramic Intalox saddles remained relatively constant under various gas rates used in the present study. The HTU was about 0.5 m for the short bed and 0.8 m for the tall bed.
- Research Organization:
- Ryerson Polytechnic Univ., Toronto, Ontario (CA)
- OSTI ID:
- 20062647
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 39, Issue 4; Other Information: PBD: Apr 2000; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
Similar Records
Experimental studies of selective acid gas removal: Absorption of hydrogen sulfide and carbon dioxide into aqueous methyldiethanolamine using packed columns
Design of packed, adiabatic absorbers: Physical absorption of acid gases in methanol