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Hi! I was wondering if trays or packed columns are more subjected to fouling.
Also, which type of trays (bubblecap, valve or sieve) will foul the most?
If possible, can someone give me the detailed reasoning behind this question?
Thanks in advance!
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Fouling (trays Vs Packed)
Started by Guest_zili_*, Feb 07 2005 01:26 AM
4 replies to this topic
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#2
gvdlans
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Posted 07 February 2005 - 04:54 AM
In fouling service you normally use sieve trays with relatively large hole sizes.
Reasoning behind the question is probably that if you know that you have a fouling service, you'd better select internals that can cope with this, otherwise your unit must go down quite often to clean out the internals. In a continuous process, going down can be extremely expensive...
Reasoning behind the question is probably that if you know that you have a fouling service, you'd better select internals that can cope with this, otherwise your unit must go down quite often to clean out the internals. In a continuous process, going down can be extremely expensive...
#3
Guest_zili_*
Guest_zili_*
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Posted 07 February 2005 - 05:11 AM
QUOTE
In fouling service you normally use sieve trays with relatively large hole sizes.
Why is it that sieve trays are better in fouling service?
What makes them less subjected to fouling than valve/bubblecap trays and packed columns?
#4
gvdlans
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Posted 07 February 2005 - 05:49 AM
Sieve trays are less likely to have fouling problems because of following reasons:
- no moving parts
- large holes will take longer to plug than small holes
- no small corners etc.
- no moving parts
- large holes will take longer to plug than small holes
- no small corners etc.
#5
siretb
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Posted 08 February 2005 - 10:21 AM
This depends a lot also on the wetting rate. We manage, in several units, to operate sucessfully packings (both random and structured) with liquids that do contain a lot of solids. If the Liquid to vapor ratio is high, packings are not that much prone to fouling.
The dualflow tray is also very fouling-resistant. It has larger holes than a sieve tray.
With a sieve tray or bubble cap tray, you also have to account for possible solids accumulation in the downcomers and before the inlet weir.
The dualflow tray is also very fouling-resistant. It has larger holes than a sieve tray.
With a sieve tray or bubble cap tray, you also have to account for possible solids accumulation in the downcomers and before the inlet weir.
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