Drum drying
Three major sources of exergy loss can be identified, including the following:
1. Some exergy is lost from the drum due to convection of air over the drum surface, which is not very large, being
of the same order as that lost with the solid products.
2. The exergy loss associated with the exhausted vapor is large when calculated on a per kilogram of water basis.
However, this energy is available at a temperature only slightly above the surrounding temperature (28.9◦C) and
is present in a large volume of air. Therefore, it would be difficult to develop an efficient means to reclaim this
exergy.
3. The steam condensate in the drum is another sizable potential loss. The saturated liquid at the drum pressure
could be used in a heat exchanger at the same pressure, or it could be flashed to atmospheric pressure and then
used as a heat exchange medium, though at a lower temperature.
Drum dryingThree major sources of exergy loss can be identified, including the following:1. Some exergy is lost from the drum due to convection of air over the drum surface, which is not very large, beingof the same order as that lost with the solid products.2. The exergy loss associated with the exhausted vapor is large when calculated on a per kilogram of water basis.However, this energy is available at a temperature only slightly above the surrounding temperature (28.9◦C) andis present in a large volume of air. Therefore, it would be difficult to develop an efficient means to reclaim thisexergy.3. The steam condensate in the drum is another sizable potential loss. The saturated liquid at the drum pressurecould be used in a heat exchanger at the same pressure, or it could be flashed to atmospheric pressure and thenused as a heat exchange medium, though at a lower temperature.
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