Dear Readers thanks a lot to Tom for his frankness, we had the same catastrophic experience with Caterpillar V 12 in the slovenian town iof Ruese back in 2014, it was wood syngas, and guess we had exactly the same problems, we can give you all sickening CAT data in 15 days, there is a complaint at Courts with million Euros damage recourse action the situation was solved by us introducing a low intensity French plasma torch and purifying tars to almost nil. the plant is now going well, payback is 3 times longer than expected, the owner had to restructure their loan with local banks three times, a very painful story, the original gasifier was Ankur
regards n cerni Inviato da iPad, Nicolo Cerni mobiloffice 0039 340.830.67.97 pls sms me or skype nico_cerni > Il giorno 23/apr/2017, alle ore 07:01, Tom Miles <[email protected]> ha > scritto: > > Can you show us some data? > > T R Miles Technical Consultants Inc. > [email protected] > Sent from mobile. > >> On Apr 22, 2017, at 9:51 PM, l <[email protected]> wrote: >> >> One of the major reasons Caterpillar won't get heavily involved in producer >> gas engines is the naphthalene issue. One group that had an operating power >> plant for a municipality would operate their engines for a few hundred hours >> and the valves would begin knocking and the V-12 engine would have to have a >> valve job. ir >> It is fairly easy to fix if one knows the properties of the gas. We do >> it as a matter of course as it doesn't make any sense to offer a system that >> has to have the engine rebuilt periodically. One engine manufacturer will >> not guarantee their engine unless it meets their strict standards. >> As to the GAST report, I read some of it and some of the procedures can >> easily be improved such as measuring the air inlet flow using a typical >> mass:flow meter out of a car that is extremely accurate and can provide >> continuous monitoring. In the program we use for our systems, it >> automatically calculates the inlet air flow rate and with settable or >> automatic monitoring inputs such as temp, humidity, can provide continuous >> and accumulated air mass input. >> There are also methods of measuring gas composition, to much better >> detail than is now being used. Fixed gases such as the usual by either GC or >> specific gas analyzers do not show the condensable gases such as ethanol, >> methanol, acetone, acetic acid, napthalene of course, and other compounds >> that may affect engine operation for the better or worse. The same system >> could be used for engine exhaust measuring of say formaldehyde, carcinogens, >> and everything except PAH and particulate. >> None of the gasifiers monitored are as efficient as we would like to see >> in our designs. High carbon yield in the char/ash residue is an admission of >> the inefficiencies present. >> As another note, virtually all emission testing is flawed because if the >> inlet air has a few ppm of NOx or CO, the output is going to be biased >> upward this amount and none of the EPA testing protocols take ambient air >> quality into account. >> >> Sincerely, >> Leland T. "Tom" Taylor >> Thermogenics Inc. >> +001-505-463-8422 >> www.thermogenicx.com >> Skype: ltt.invent >> >> >> -----Original Message----- >> From: Doug <[email protected]> >> To: 'Discussion of biomass pyrolysis and gasification' >> <[email protected]> >> Sent: Sat, Apr 22, 2017 5:39 pm >> Subject: [Gasification] Naphthalene Condensate Photos >> >> >> Naphthalene in Producer Gas >> >> Hi Gasification Colleagues, >> Reading through the Italian Paper on gasifier monitoring in South Tyrol, the >> reference to Naphthalene caught my eye, because as a light pyrolysis oil, >> after dry filtration and condensation, I have only seen this in gas in the >> Northern hemisphere. Looking like yellow oil floating on aqueous condensate, >> exposed to air when tipped onto a concrete surface, it just completely >> vaporizes leaving only a carbon trace of stain. It makes a good mess inside >> pipes and diaphragm regulators and if being combusted in a flare or >> oxidation chamber, will add to the emissions from the stack. The bottom line >> is that we don't want this in our producer gas for either engine or >> combustion applications, but once condensed, it's very hard to clean out of >> the gas. >> My questions to any one who might have some similar experience, is why >> Naphthalene may not show up in small gasifiers under say 100m3/hr, yet >> becomes a issue as the gas output increases from a larger system. I have >> observed this formation in N.Ireland and California and definitely related >> to just higher output. Could it be related to the amount or volume of the >> unstable pyrolysis gas in the fuel hopper? Can this create a chemistry that >> can survive an incandescent char bed, but reform as Naphthalene in the gas >> reduction phase? >> I can assure you that it isn't about tar or bad design, as our bed analysis >> and pressure drop continuous monitoring has not shown bridging or channeling >> to be the culprit. Black tars are never present, nor is CH4 as Methane >> (<2%), so bed temperatures are not an issue, nor moisture content of the >> fuels (wood chips or blocks). Char under the grate is dry and clean, as is >> the <10 micron dust from the cyclones. >> The photos show two samples from a larger system, one a first stage cooling >> containing ash and carbon with a purple colour from the ash. The second bag >> from the cooling condenser is yellow from the Naphthalene which did increase >> with more gas output . The square container is completely clear and comes >> from the Fluidyne Pacific Class gasifier (90m3/hr) and it has always made >> clear condensate in both hemispheres except when incorrectly fueled. It has >> not been possible to test larger gasifiers of our own design here in New >> Zealand, hence the questions. >> Any discussion would be appreciated. >> Doug Williams, >> Fluidyne. >> >> >> >> >> _______________________________________________ >> 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/ >> >> _______________________________________________ >> 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/ > _______________________________________________ > 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/
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