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Direct‐contact steam condensation with simultaneous noncondensable gas absorption
Author(s) -
Bontozoglou Vasilis,
Karabelas Anastasios J.
Publication year - 1995
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690410206
Subject(s) - condenser (optics) , condensation , mass transfer , dissolution , thermodynamics , absorption (acoustics) , heat transfer , chemistry , materials science , mechanics , chromatography , composite material , light source , physics , optics
Experimental results are reported on simulataneous heat transfer and gas dissolution during the direct‐contact condensation of steam on water in the presence of CO 2 . A column filled with structured packing is used as condenser with the water in counterflow with the steam/CO 2 mixture. The region along the column where the bulk of condensation takes place is controllable by suitable choice of the steam/water ratio. Measured local heat‐transfer coefficients change by roughly an order of magnitude from the bottom to the top of the column. The extent of CO 2 dissolution in the water/condensate under most conditions is unexpectedly high and depends strongly on the exit liquid temperature. A driving force based on the interfacial CO 2 concentration, not the overall concentration difference used in conventional absorption operations, is suggested as more appropriate to describe the phenomenon. The data are complemented with preliminary results from a computational model based on the integration along the column of local heat‐ and mass‐transfer rates.