Tank heating by direct steam injection

bruce varley · science forum beginner Joined: 31 May 2005 Posts: 38

The answer to this question is almost certain to be 'it depends', but any
clues would be appreciated. We're going to have a tank containing water
(continuous flow in/out) that's being heated by direct injection of steam.
Obviously when the liquid temperature gets very close to BP, the absorption
of steam will diminish and the rate of venting from the tank will increase.
I'd like to get some idea of how venting rate might relate to temperature
below BP, eg. would the situation at 98C be similar to that at a
substantially lower temperature, or would a large proportion of steam be
venting at that temperature? Might it be possible to get a handle on the
'knee' temperature?

As with all my postings here, real problem not homework. TIA

A Espinoza · science forum beginner Joined: 14 Sep 2005 Posts: 19

This may not be the answer you need, but I would suggest using one of
those hot water mixers made by Spirax-Sarco to mix your steam and the
water before putting it in the tank. This is probably more efficient and
less hazardous.

The reason for that is that you will encounter cavitation as the steam
enters your tank. The nozzle and the area around it may get damaged with
the cavitation.

bruce varley wrote:

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