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/
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