Dear James, I can´t say anything to the flue gas fitering system, but I may be able to contribute to the filtering of product gas from gasification processes:
In Germany nowadays most projects use bag filters with working temperatures of 120 - 160°C. Others use hot gas filtration at around 400°C using stainless steel mesh filter materials. Wet gas cleaning with oil scrubbers or electrostatic filters is used in older projects but not common at all for new projects. For fifteen years there were (and there still are) people advertising their high temperature filter systems (candles like Herding, or BWF and metal mesh). They claim that these filters can handle tar load. But, according to my experience, with tar in the gas you will never get happy at all. It is not even an issue of the filter concept. Due to harmful substances in the tar you cannot even organize maintenance of such system when following health and safety regulations. So such filter won´t help you either. Furthermore, as already stated, once condensing conditions appear, the whole thing is gone. The candles (no matter who is the manufacturer) typically do have a problem when the dust in the gas is very fine (soot...). In the past the "overdesigned" filters typically turned out to be "underdesigned" in the real project with the filter manufacturer saying: "we did not expect that there is so much fine dust...". So they start with precoating. At the end some projects had to order a second filter of same size to run in parallel. I know a few projects where this was the recommended solution. So, if you go for that, increase the filter surface right from the beginning no matter what the manufacturer tells you. You might also consider the German company Calida Cleantech GmbH (http://www.calida-cleantech.de/en/) (formerly LignoGen GmbH). They also provide hot gas candle filter systems. I know one of their projects in Germany where they filter product gas quite well. I know that they are interested in projects filtering pyrolysis gas. You might contact them. 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. Für Schäden, die dem Empfänger gleichwohl durch von uns zugesandte mit Viren befallene E-Mails entstehen, schließen wir jede Haftung aus. The information contained in this email is intended only for its addressee and may contain confidential and/or privileged information. If the reader of this email is not the intended recipient, you are hereby notified that reading, saving, distribution or use of the content of this email in any way is prohibited. If you have received this email in error, please notify the sender and delete the email. We use updated antivirus protection software. We do not accept any responsibility for damages caused anyhow by viruses transmitted via email. ---------------------------------------------------------------------------- ---- -----Ursprüngliche Nachricht----- Von: Gasification [mailto:[email protected]] Im Auftrag von James Joyce Gesendet: Dienstag, 31. Oktober 2017 00:48 An: [email protected] Betreff: [Gasification] Candle filter experiences We are just about to order candles for a flue gas filtration application at 350 deg C. We have also been asked to design a 400 deg C candle filter system for pyrolysis gas, for installation ahead of a condenser. This is one example (not necessarily the supplier we will use) http://www.herding.de/files/hGlobal/Downloads/Technical_product_descriptions /ALPHA/UK/Herding_ALPHA_Biomass_Filterunit_uk.pdf I have read some of the case studies for larger gasifiers. I am interested to know what experiences, if any, have been had with candle filters at the smaller scale (say 2-20 tonnes per day of biomass gasified). Reliability is my main interest, number of hours between replacement ... and performance as far as downstream equipment such as condensers and engines are concerned. Regards, James _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg ylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/ _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [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/
