I have seen some very light denim weave fiberglass that looks like it has good possibilities. My concern with it is so shinny that soot and water will travel through it better than any other fabric.TomC
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And it should allso be clean’able materiel. Depending ware in line its located it seem anyway.?
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Curtain material used to often be made from fiberglass, might still be. That should offer a range of fabric weights and weaves. Curtains like that should be available in thrift shops.
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Vesa Mikkonen from Finland uses Teflon-coated Nomex filter cloth for hot-filtering in his woodgas system.
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Hi, Tilman!
The rest of us are trying out ALI-BABA micro mesh SS mesh, but no “baby” filters, grown-up people use 1m2 X 1 thousand rpm X liter displacement.
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Dear Max,
this is a good approach and great idea.
How are the experiences with the micro mesh? Especially filtering ability and stability of the mesh?
How do you clean it? How do you fabricate any seams?
And how is the overall performance compared to fiberglass or Nomex cloth?
Sorry for so many questions.
Edit: Just have seen that you already answered some questions here:
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Hi, Tilman!
8.2.2018
To beginners I usually put the staring question:
How do you want to handle 8 gallons (~30 liters) of soot?
I do not question: How do you avoid handling 8 gallons of soot!
Starting point = reality.
Abrupt; I see you found my earlier writing. Please put it out in full length!
Well, the soot handling: In the twenties the best soot handling was split in 5 stages, now a decent cleaning system can be done with 3 or 4 stages.
Coaxial two-stage Thien cyclone
SS metal mesh tube filter
Washing-boiling + condensing cooler
Wet Open cell mattress filter (in a chest)
Re-heater
Paper-filter
A smaller version:
A Thien two-stage coaxial cyclone
Washing + condensing cooler
Re-heater
Paper filter
The available space is a non-compromise factor in most mobile cases.
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Hi Max,
thanks for your detailed answer.
My reference of your post in the other thread is a link and not a quote, you can expand it by clicking on the small arrow in the upper right corner.
I hope we are not moving too much away from filter media with this question, but I’m very interested in your opinion.
In his book, Vesa Mikkonen uses only a 2 stage setup: A large hot cloth filter (Nomex fabric) and a washing-condesing cooler. According to his book, this works very well for him.
My questions are:
Do you think, the micro mesh SS could be used in Vesa’s setup instead of the Nomex alone without a secondary paper filter?
And what are the drawbacks of Vesa’s design in your opinion, so that you go for more stages in cleaning?
I could imagine that a reason could be that Nomex is not cheap and his design tends to be large, so everything has to be installed on a trailer.
Regards,
Til
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Hi, Til!
8.2.2018
Then the 3-component build-up:
–Gasifier
–Coaxial double Thien cyclone heating an outer peripheral paper filter
–washing-condensing cooler
Obvious gas-stream:
Gasifier to double coaxial cyclone to washing condenser, back to heated paper-filter around the cyclone.
Make it shorter! ???
Warm filtrated gas available with 3 components.
(Including the gasifier!)
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Hi Max,
your proposed setup sounds practical and relatively compact.
But may I ask again, as it is still not totally clear for me:
-
Do you think, the micro mesh SS could be used in Vesa Mikkonen’s filter instead of the Nomex alone without a secondary paper filter?
-
And what are the drawbacks of Vesa’s design in your opinion, so that you go for different gas cleaning?
Thanks again and sorry for still bothering you with my questions.
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How do you buy from there?, read that you have to be careful who you buy from. Tips?
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Hi, Til!
8.2.2018
You are Welcome! Hübsh und höflich!
Why not, with the same active area the weight will of course raise, that depends on what the current support weighs. (with Nomex)
Can, if you don’t strive for optimum quality. Good enough…But less safe. The paper filter has the role of safety filter, if something happens to the Nomex or SS mesh.
A big drum with insulation and extra metal accessories.
It drops totally away in the 3-komponent variety.
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High, Al!
8.2.2018
One guy buys a roll on internet; the minimum has been 10m on a roll, so others are sharing. That would become 2 good filters or 3 under-dimensioned ones for normal motor sizes.
The width varies for different qualities; 3 – 4 feet normally.
PayPal!
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That’s the million $ question, how that one guy buys on Alibaba
Hi, Al!
9.2.2018
Page up and page down, endlessly list after list…
I started: Alibaba netshopping ss woven mesh
China Stainless Steel Net, China Stainless Steel Net Shopping Guide …
https://guide.alibaba.com › Minerals & Metallurgy › Wire Mesh › Steel Wire Mesh
Drowning in a too general formulation. Then a more precise quest:
“Alibaba net shopping gas filtering mesh 30 micron openings”.
Result:
25 Micron Stainless Steel Wire Mesh - Alibaba. WOW!
Still: Be sure of thread thickness, opening size and ss material,
roll width and length, MOQ = minimum order quantity!
Remember: Heat resisting quality!
Don’t do shortcuts! Go exclusively through PAYPAL!
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Hi, Al!
11.2.2018
After gassing through a few hours, a uniform, thin soot-layer
will form on the mesh. This is the ultimate (microscopic) filter.
That’s why a modest velocity through the filter is needed.
A forceful pull-trough is nullifying the quality buildup.
0,5 – 1 … X … l … X … n = m2
l = liter
n = RPM:1000
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Hi Til!
12.2.2018
I seem to have lapped to answer on Vesa Mikkonen’s system as a whole:
I am going back to the fundamental (starting) question:
How do you prefer to handle 8 gallons (~30liters) of soot?
Is it a good idea to blast all that soot directly into a large fine-filter,
and then follow up with washing, cooling and drying?
My idea is to do a daily 2 – 3 minute cyclone-pot emptying and
removing 90 – 95% of the soot, thereby postponing
the filter handling with a considerable count of weeks.
Who likes what?
In the proposed 3 – component system (including gasifier) the big fine-filter is totally scrapped,
a paper filter handles dry warm gas after the cyclone and washing – cooling – re-heating.
Washing by a flap–flap–flapping cloth on the water surface under the cooler. The gas streaming between the surface and the wet flapping cloth. No significant pressure drop from floating the wet flapping cloth on the water surface.
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Dear Max,
finally I now think I fully understand the idea behind your filter setup.
Thanks for clarifying !
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Hi,Til!
12.2.2018
I made changes, add-ons again… look back.
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Max,
That “flapping cloth” on the surface of the condensate is brilliant! 
Self Cleaning!
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