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Oxalic acid evaporators

 
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AndyC
Scout Bee


Joined: 04 Jul 2014
Posts: 301
Location: Uk/Horsham/RH13

PostPosted: Thu Apr 21, 2016 6:02 pm    Post subject: Oxalic acid evaporators Reply with quote

I've been reading up on the home made versions of these evaporators using auto diesel glow plugs.

Hope people realise that oxalic acid cystals evaporate at 157C and breakdown at 187C.

Diesel glow plugs generally heat to bright red heat, about 950C, in a few moments so even with wiring resistance and mechanical losses are apparently far too hot for this application at 12v, unless the current is controlled in some way.

Gonna be some fried bees on the menu I reckon.
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madasafish
Silver Bee


Joined: 29 Apr 2009
Posts: 880
Location: Stoke On Trent

PostPosted: Fri Apr 22, 2016 6:36 pm    Post subject: Reply with quote

I run a glowplug evaporator and have killed no bees. Despite trying on seven hives.

As the evaporator heats up from the glowplug, the oxalic sublimes , and vaporises. None remains of the suggested 2gm dose after about 90 seconds.. With no pressure to prevent vapourisation, the oxalic acid does not overheat but forms a liquid , and bubbles off.

Scare stories abound, reality is different. Don't believe what you read on the internet.

Of course if you use enough oxalic on a small surface so it binds together in lumps of acid solids and liquids, it might be different. But we are then talking lots of grams not 2..
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AndyC
Scout Bee


Joined: 04 Jul 2014
Posts: 301
Location: Uk/Horsham/RH13

PostPosted: Sat Apr 23, 2016 7:55 pm    Post subject: Reply with quote

Did you spec the glow plug to run at 12v or just trust to luck?
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madasafish
Silver Bee


Joined: 29 Apr 2009
Posts: 880
Location: Stoke On Trent

PostPosted: Sun Apr 24, 2016 2:28 pm    Post subject: Reply with quote

I bought a Champion CH154 for a TOYOTA 2.4D HIACE. £2.75 delivered ebay..

Old style 12V diesel so lower temps..

see http://tinyurl.com/grh89lr for similar.


Luck? Well I trained in physics so know a little electricity and electronics..Smile
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AndyC
Scout Bee


Joined: 04 Jul 2014
Posts: 301
Location: Uk/Horsham/RH13

PostPosted: Sun Apr 24, 2016 4:15 pm    Post subject: Reply with quote

Ok understood thanks.
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zaunreiter
Moderator Bee


Joined: 26 Nov 2007
Posts: 3097
Location: Germany, NorthWest

PostPosted: Mon Aug 15, 2016 9:12 am    Post subject: Reply with quote

Oxamat Mini for Warré hives:

https://www.youtube.com/watch?v=wdsbClU0y6I

Uses a car battery and a headlamp bulb (H4 55/60 W) as a heat source. The fan distributes the vapor throughout the hive.
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