MacBoka users

High performance modular SS304 plated columns and accessories.

Re: MacBoka users

Postby hillzabilly » Wed Aug 09, 2017 1:25 pm

If I was trying ta get flavour from it,I would try removeing 90% of the packing leave the output valve fully open ,and drop ya power to 1000-1400wt after heat up.cheers hillzabilly ;-)
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Re: MacBoka users

Postby Bundaboy » Wed Sep 20, 2017 8:49 pm

Ha! I was wondering why I only get 93% whereas others get 95% and have just discovered it's because I have a 600mm column instead of the 1 metre column at least one other user has mentioned.

Ok, I now have a 600mm ss column tightly packed with copper mesh (6 rolls), if I add another 600mm section could anyone suggest how much additional packing I would need? Surely another tightly packed column would be over the top? Cheers.
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Some parts in the shed for something more "traditional", 2" MacBoka atop a 50L SS keg fitted with 2 x 2400W weldless elements (with guards).

Re: MacBoka users

Postby scythe » Thu Sep 21, 2017 5:52 am

Nope, bokas are made for neutrals and are generally fully packed.
Its the packing that does the purification.

Altho one would think that if 6 mesh bits gets you to 93% then at most you would need another 3.
Maybe...
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Re: MacBoka users

Postby Professor Green » Thu Sep 21, 2017 6:16 am

I added an extra 500ml section fully packed and it worked a treat. I just used stainless scrubbers for that section rather than copper mesh.

Cheers,
Prof. Green
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Re: MacBoka users

Postby Bundaboy » Thu Sep 21, 2017 10:28 am

scythe wrote:Nope, bokas are made for neutrals and are generally fully packed.
Its the packing that does the purification.

Altho one would think that if 6 mesh bits gets you to 93% then at most you would need another 3.
Maybe...


Ok, yes I was thinking that later although I was also thinking I may have my 600mm section packed too tightly (I actually have seven copper rolls packed in there so it is very tight but it seems to work well as is and have had no flooding), but yes no point in the column extension without it being packed (although it seems I only need the *equivalent* of 1 metre for 95% according to theory). Cheers.
Bundaboy
 
Posts: 249
Joined: Sat Oct 31, 2015 4:58 pm
Location: Southern Highlands, NSW
equipment: MH-943/s water distiller
Some parts in the shed for something more "traditional", 2" MacBoka atop a 50L SS keg fitted with 2 x 2400W weldless elements (with guards).

Re: MacBoka users

Postby Bundaboy » Thu Sep 21, 2017 10:29 am

Professor Green wrote:I added an extra 500ml section fully packed and it worked a treat. I just used stainless scrubbers for that section rather than copper mesh.

Cheers,
Prof. Green


Yes, that would be an option too, I probably have enough copper in there for sulphide removal as is - I will compare costs. Cheers.
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equipment: MH-943/s water distiller
Some parts in the shed for something more "traditional", 2" MacBoka atop a 50L SS keg fitted with 2 x 2400W weldless elements (with guards).

Re: MacBoka users

Postby Bundaboy » Tue Dec 12, 2017 3:20 pm

I have been reading a few Boka posts around the traps and "only 1400W" or similar has come up a few times.

I have been running mine at around 450-500W. This allows me to reduce both the energy and the water costs whilst maintaining the "drip rate" others on this topic have advised.

I seem to get results consistent with others running the unit, although I have long felt my "tails" are longer that I would expect, and have been trying to ascertain a) whether they are unreasonably long, and b) if so why?

I realise the length of the column has an affect on the "purity" of the product but as the standard for a MacBoka is 600mm (as I have) I would have expected others to be getting similar results.

As the Boka is a liquid management system I wouldn't have thought that power as much to do with it as long as the vapour is reaching the condenser and falling back on the plates.

Does anyone know if input power can affect the reflux action of a Boka? (my searches haven't turned up anything definitive).

Cheers all.
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Some parts in the shed for something more "traditional", 2" MacBoka atop a 50L SS keg fitted with 2 x 2400W weldless elements (with guards).

Re: MacBoka users

Postby woodduck » Tue Dec 12, 2017 4:18 pm

Power will effect the end results as the more power the more reflux/cycles up and down the more pure/cleaner the product. If your power isn't high enough your only getting a small amount of vapour up the column and that is what your taking, you need more than what your taking off so it flows back down the column to mix with the rising vapor, make sence. I would think 500w would be very low. I used to push my boka to the point where it was only just holding the vapor from escaping out the top. Probably close to 1800-2000w.
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Re: MacBoka users

Postby Bundaboy » Tue Dec 12, 2017 4:57 pm

woodduck wrote:Power will effect the end results as the more power the more reflux/cycles up and down the more pure/cleaner the product. If your power isn't high enough your only getting a small amount of vapour up the column and that is what your taking, you need more than what your taking off so it flows back down the column to mix with the rising vapor, make sence. I would think 500w would be very low. I used to push my boka to the point where it was only just holding the vapor from escaping out the top. Probably close to 1800-2000w.


It makes sense that I need to make more than I am taking off, I am, I have the needle valve barely cracked open, if I open it a turn or two I get a stream, albeit it reduced ABV. I would have thought that as long as the vapour is reaching the condenser it would cycle up and down the column as normal.

I didn't specifically say but I am getting 94%, but certainly if it's not refluxing enough that could be my problem.
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Posts: 249
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Location: Southern Highlands, NSW
equipment: MH-943/s water distiller
Some parts in the shed for something more "traditional", 2" MacBoka atop a 50L SS keg fitted with 2 x 2400W weldless elements (with guards).

Re: MacBoka users

Postby Bundaboy » Tue Dec 12, 2017 5:34 pm

I found this:
"On a reflux still you want the proper amount of vapor sent to the column to produce the proper amount of reflux for the still to work at an optimum level. Too little heat results in too little vapors and reflux giving you poor results and shows up as higher temps on the columns thermometer. This results in a lower ABV product because not enough reflux is returning to the column for the packing to work properly. Not having the proper amount of reflux returning to the column will not allow the needed column temp gradient to be achieved, more hot vapors than cooler returning reflux showing a higher temp than wanted. Now a too high of a heat input creating to many vapors will more than likely flood the column where there is too much reflux returning to the column and to much vapors coming from the boiler causing the vapors to hold the reflux in the column not allowing it to return to the boiler. This will cause a safety problem and poor performance. You need to be able to adjust the heat input to achieve the correct amount of vapors to achieve the correct amount of returning reflux and rising vapors in the column. This is different for every still. And as above the ABV of the boiler charge will also change this so it needs to be adjusted for your particular still setup. There isn't a one size fits all type heat setting it's all as per still."

Which makes sense as far as it goes BUT it doesn't tell me how to find that optimal setting - I have been working on the assumption that if I get 94% I am optimal for this length column.

Edit: (oh and 76.4C steady)
Bundaboy
 
Posts: 249
Joined: Sat Oct 31, 2015 4:58 pm
Location: Southern Highlands, NSW
equipment: MH-943/s water distiller
Some parts in the shed for something more "traditional", 2" MacBoka atop a 50L SS keg fitted with 2 x 2400W weldless elements (with guards).

Re: MacBoka users

Postby Bundaboy » Tue Dec 12, 2017 8:38 pm

Boy oh boy, talk about putting theory into practice, you won't believe this (I am only posting this because of what I posted immediately above):

Ok, so I decided I would up the power from 450 Watts to 1400 Watts - now, before I go on, lets get one thing straight - this was my OWN choosing - this was not the result of any one else's advice. No one is to blame for this but me. I knew there was a risk associated with this because the controller I have had a faulty 30 amp fuse and all I had on hand was a 10 amp fuse (I am an electrical engineer, electronics technician, and qualified electrician - I was well aware of what I was doing). This, in it self, was no big deal: at the power levels I normally use that is fine, however, upping to 1400W was pushing it, and eventually the fuse blew (actually the solder on the cap melted).

Ok, I expected that (to some extent anyway, I *was* hoping to get away with it) so what to do? Well, I thinks to meself (always a dangerous thing to do), why not run it flat out with more water flow - every one else seems to do it (except they don't normally have 2400 Watt elements) and I only have ~4 hours to go to finish, only ~2 hours to opening the needle valve for tails, what could go wrong?

Going well until I noticed that tell tale smell of alcohol vapour in the air, not enough water flow? No, all the vapour was being knocked down, product too hot? No, feels luke warm to the touch, oh no! not a seal leak?! Check the seal at the top, ok, check the seal at the head, ok, check the seal at the top of the boiler, which incidentally is covered by my insulation wrap (which, perhaps, I should have removed for this experiment)... sigh... thar she blows. That's funny, I think, I thought that seal was fairly new, and it was ok for 8 hours of this run - and then it dawned on me - what did they say would happen? Flooded column. aaaaaagh!!! Shut her down for the night.

So there you are, proof that you can go too high with power, now to work on the lower limit.

Have a good laugh at my expense but for God's sake don't do this at home, I am not normally this cavalier with safety, the thing that bothers me most is how long it took me to eventually convince myself something was wrong and shut down, *especially* after posting that info above.
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Posts: 249
Joined: Sat Oct 31, 2015 4:58 pm
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equipment: MH-943/s water distiller
Some parts in the shed for something more "traditional", 2" MacBoka atop a 50L SS keg fitted with 2 x 2400W weldless elements (with guards).

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