The QT helium recovery system has a multiple speed compressor which is
always on. It ramps to pressure changes in the helium header. The
compressor compresses into a buffer tank that is set at a higher pressure
than your storage tanks. It works OK. There are a lot of joints and, as we
know, any of them could leak. I have a QT system and can operate many
functions remotely via TeamViewer. Like all recovery systems, the learning
curve is steep and annoying.
On Wed, Jan 31, 2024, 07:23 Spin-Doc <bert.heise_at_spin-doc.net> wrote:
> 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 stores 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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