Bjorn,
Yes, I can supply them and other systems which may arise from their use. I
can also provide a strong guarantee of their performance. They are not
particularly expensive in comparison to the life cycle costs of other systems.
Sincerely,
Leland T. "Tom" Taylor
Thermogenics Inc.
+001-505-463-8422
www.thermogenicx.com
Skype: ltt.invent
-----Original Message-----
From: Björn Kuntze <[email protected]>
To: 'Discussion of biomass pyrolysis and gasification'
<[email protected]>
Sent: Wed, Nov 8, 2017 5:42 am
Subject: Re: [Gasification] Candle filter experiences
Hi James,
Doug
Tom,
we have some good experience with operating electric filters with wood gas.
Measures have to be taken to prevent the soot from reaching the insulaters,
since the soot works as a conductor.
There is at least one WESP design from Paul Forsthuber, Austria, which is used
in several fixed bed downdraft gasifier systems in the 200-300 kWe range. I
worked with such WESP in one project earlier. It works fine, but it needs some
attention from time to time as well.
Others, like Beth Filters, Lubeck, Germany, which use quite standard WESP
design, are not what I think to be the ideal design.
Tom, would you supply your electric filters for third hand projects? Could you
provide some more detailed information?
Mit freundlichen Grüßen / with best regards
Björn Kuntze
MasterGas UG (haftungsbeschränkt)
Bloherfelder Anger 7
26129 Oldenburg
Germany
Geschäftsführer: Björn Kuntze
Mobil: +49 (0) 177 345 1557
Email: [email protected]
Web: www.mastergas.de
Handelsregister: HRB 211272 – Amtsgericht Oldenburg
USt-ID-Nr: DE307863882
St.-Nr: 64/213/02649
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Von: Gasification [mailto:[email protected]] Im
Auftrag von l
Gesendet: Mittwoch, 8. November 2017 05:58
An: [email protected]
Betreff: Re: [Gasification] Candle filter experiences
Well, if you don't have the right insulator system, that is true, but with the
right insulating design, it doesn't happen. We have hundreds to thousands of
hours operating time with perfectly intact insulating system at 35-50 kv in the
acidic, conductive and potentially explosive environment, with the fact that a
produced gas is not supposed to contain oxygen so it won't ignite, this is
built into the control system as a back up.
Of course, everyone thinks that the hanging wire "indirect charging" ESP is the
design when it fact it it not and the charging density can be 50-200x greater
in the design we use, which makes it much smaller for the same collecting
effect.
Keep pursuing the same obsolete designs and then don't cry about not have an
economic system.
Sincerely,
Leland T. "Tom" Taylor
Thermogenics Inc.
+001-505-463-8422
www.thermogenicx.com
Skype: ltt.invent
-----Original Message-----
From: Doug <[email protected]>
To: gasification <[email protected]>
Sent: Tue, Nov 7, 2017 9:50 pm
Subject: Re: [Gasification] Candle filter experiences
Hi James,
Sorry for slow response but have been a bit ill these last ten days.
The bad news is that ESP isn't going to work either with wet carbon
soot. It shorts out all the anodes causing arcing and explosions. The
European guys had several "incidents" so not sure they are even legal to
use, other than for dry boiler fly ash, etc. I'm sure Bjorn has more to
add, but save your $$ and time.
Regards,
Doug Williams,
Fluidyne.
On 02/11/17 12:16, James Joyce wrote:
> Thanks for the advice Doug, Bjorn and Leland. Hopefully you can prevent
> others from exploring again some of the many dead ends that gasification
> presents to us "starry eyed" technologists !
>
> I am certainly more nervous that I was before. The flue gas application might
> go ok, as long as we keep the start-up emissions out of it ... but the
> pyrolysis gas application looks like trouble. I will have to follow up on ESP
> for that, however the last time I looked that the cost of the electrical
> items was more than twice the cost of the rest of the plant combined.
>
> I had considered burn-off as the option for tar fouling in the flue gas
> application. We will be running at 350 deg C with 30-40% excess air, so it
> might not need much encouragement to burn off any tars once it gets to
> temperature.
>
> We were going to use a flooded auger for dust removal, recognising that a
> smouldering hopper fire is all but inevitable, because we can get ember
> carryover from our thermal oxidiser. Will have to look at how to manage the
> hold-up of the soot/ash. I have considered a sonic horn for that. They are
> used for soot/ash release in large coal fired furnaces ... not cheap and may
> present some risk to the candles.
>
> Sounds like cyclones ahead are a bad idea ... just as well as I had no
> intention of doing that figuring the cake needed the larger particles to give
> it some "body".
>
> Great to get some actual numbers on pressure drop. Unifrax were suggesting to
> keep it below 10" to avoid stressing the candles. In the flue gas
> application, we can use compressed air for the back-pulse, so we don't have
> to be as conservative as you would be with inert gas. For the pyrolysis gas
> application I can see this being another reason to have a good look at the
> electrostatic precips again ...or perhaps batch filtering with deep bed sand
> filters that are water washed once the pressure drop is too high ?
>
> regards,
>
> James
>
>
>
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