Effect of Noncondensable Gases and Vent Flow Rate on the Thermal Performance of Single-Pass X-Shell Condensers

The adverse impact of carbon dioxide and air on the thermal performance of condensers used in multistage flash ( MSF) distillation plants is addressed. For normal operating conditions, the inlet gas flow rates are not sufficient to affect the thermal performance significantly. The heat duty for a ty...

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Bibliographic Details
Published in:Heat transfer engineering 1986-01, Vol.7 (3-4), p.35-42
Main Authors: RABAS, T. J., MUELLER, A. C.
Format: Article
Language:English
Subjects:
Applied sciences
condensers (liquifiers)
distillation
Drinking water and swimming-pool water. Desalination
Exact sciences and technology
Pollution
thermal variables control
Water treatment and pollution
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Summary:The adverse impact of carbon dioxide and air on the thermal performance of condensers used in multistage flash ( MSF) distillation plants is addressed. For normal operating conditions, the inlet gas flow rates are not sufficient to affect the thermal performance significantly. The heat duty for a typical condenser design is then determined for a broad range of entering noncondensable gas flow rates and vent flow rates. When the inlet steam/C0 2 mass ratio falls below about 250, the thermal performance is strongly affected by the noncondensable gases. When the vent flow rate approaches the minimum vapor/gas ratio based on the coolant temperature, a sharp drop in thermal performance also occurs. However, the thermal performance is not sensitive to the vent flow rate when it is about twice this minimum value.
ISSN:0145-7632
1521-0537
DOI:10.1080/01457638608939651