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CO2 vaporizer

CO2 vaporizer

(OP)
Hi,
I am working in a brewery where we are using gas CO2.
I got a recurent concern on CO2 distribution and would appreciate if someone can give me some guidance.
In cold season (10°C, outside ambient T°), I got an atmospheric vaporizer (working @ 15 bar,coming from CO2 storage tank) which is most of the time half frozen and the other half free of any ice.
This make me guess that I got enough capacity for my demand downstream and that my T° outlet of my evaporator should be about ambient T° (~10°C).
My plate on my vaporizer state units that I am not familiar with: 300 VMC/HR? does someone know those unit?

Farther down, as soon as CO2 reach my reducing station (15/6 bar), I got my pipe uninsulated, and my downstream filter which are full of ice!!
1. First, I am surprised to be so cold because the Mollier diagram show that the isoT° is rather vertical and can barely explain such a big drop of T°
2. I got sometimes my pipes which is blocked and no CO2 flows through. Again, back, in my mollier diagram, I can see that I cannot have CO2 in another form than gas (@6bar,0 to -10°C), so gas cannot block my pipes!! Can someone confirm?
3. If CO2 can only be in the gas form,the only thing which can block my circulation is frozen water coming from a bad CO2 recovery (maily driers in poor shape). Is it making sense?

Thanks for your feedback,

RE: CO2 vaporizer

Is it a forced draft or natural draft ambient vaporiser? I'd more likely assume it was between 0 and 5 degC outlet temperature from vap.

VMC? Not heard of it... What language is the name plate in? It is probably something like "standard" or "normal" if the nameplate is not in English, with the MC being cubic meters. What is the actual flowrate of the CO2 that you are being supplied?

Regarding the ice in the filter - I'd agree with it more likely being something to CO2 recovery rather than the bulk LCO2 / vap. If you had water in the CO2 tank, I think that would be more obvious!

RE: CO2 vaporizer

(OP)
Thanks for the answer. Sorry for the late answer, the notification fell in my junk mail.
It is not ventilated , but ambient vaporiser!
It was indded NMC = Normal Meter cubic and not VMC!
The flowrate is about 100 Kg/G, so far under the capacity of the plate!!

RE: CO2 vaporizer

Can you capture some of the "Ice" in an open container and let it melt?
If it is a water problem, you will have water in the container. If it is really dry ice plugging the line then you have a different problem.
You have rapid pressure drops causing dry ice to be generated and you need to look at letting the pressure down from the vaporizer differently.
I wish I could tell you more. Maybe go back and read posts on CO2 by Montemayor, Dcasto, or zdas04. They seem to know a lot about it.

Regards
StoneCold

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