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 -------------------------------------------------------------------------------- Diese Information ist ausschließlich für den Adressaten bestimmt und kann vertraulich oder gesetzlich geschützte Informationen enthalten. Wenn Sie nicht der bestimmungsgemäße Adressat sind, unterrichten Sie bitte den Absender und vernichten Sie diese Mail. Anderen als dem bestimmungsgemäßen Adressaten ist es untersagt, diese E-Mail zu lesen, zu speichern, weiterzuleiten oder ihren Inhalt auf welche Weise auch immer zu verwenden. Wir verwenden aktuelle Virenschutzprogramme. 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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 <http://www.thermogenicx.com> Skype: ltt.invent -----Original Message----- From: Doug <[email protected] <mailto:[email protected]> > To: gasification <[email protected] <mailto:[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 > > > _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] <mailto:[email protected]> to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
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