Dear Chris,
I may of course be missing something - unfortunately the quantum-technology
webpage doesn't appear to contain any detailed information about their "Picasso"
NMR setup - it's not really clear to me how they handle the vastly different
scenarios of very small boiloff over weeks and months where you cannot have a
large compressor running continuously without risk of boiling off all helium,
and then needing to pump much larger quantities during a helium refill. Possibly
by having two compressors, one very small, running continuously to capture
normal boiloff and a larger one during refills? At any rate, without "zero-pressure"
storage a pump must operate continuously and in a delicately controlled manner
to avoid any over- or underpressure, both being potentially dangerous for the magnet.
The company provides, however, a link to their customer Astra Zeneca in Mölndal,
Sweden as well as mentioning the Swedish NMR centre in Göteborg - maybe not a
bad idea to contact them about it?
Probably the Astra Zeneca setup will be the more "interesting" one as the Göteborg
NMR centre operates four pumped magnets which are constantly boiling off a large
amount of helium - so not really close to a "typical" NMR lab (but an excellent
setup for a helium recycling plant).
Just my 0.02 EUR,
Bert
> Am 28.01.2024 um 21:09 schrieb Fares, Christophe <fares_at_mpi-muelheim.mpg.de>:
>
> Dear Community,
>
> I was wondering if there is anyone out there willing to share their experience
> with the He-recovery systems like the one from Quantum Technologies(Picasso/ “All-metal”) ----
> or similar? --- which have the characteristic feature that they works without a “balloon”
> to collect He. Instead, the He boil-off is directly purified and re-liquefied.
> In case of high flow (eg. during fills), a compressor switches on and stres
> excess flow to a medium pressure container for later recovery. The advantages
> are the smaller space requirements and the helium reaching the purifier less
> contaminated.
>
> But perhaps there are obvious downsides which I am not seeing, especially since
> this solution does not seem to be widespread.
>
> Best regards
>
> Chris
>
> ---------------------------------------------------
> Christophe Farès, Ph.D.
> ---------------------------------------------------
> NMR Department/NMR Abteilung
> Max-Planck Institut für Kohlenforschung
> Kaiser-Wilhelm Platz 1
> 45470 Mülheim an der Ruhr
> Tel: +49 208 306 2130
> E-mail: fares [a] mpi-muelheim [.] mpg [.] de
> ---------------------------------------------------
>
>
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