Plasma gasifiction is process where temp is raised more than 1400-1500 deg cent. At this temperature which is known as plasma temp, all compounds are bound to disintegrate into their primary elements ( example;- CH3OH into C, H and O molecules). The process does not need oxygen.
Sunil Rawal On Sat, Sep 18, 2010 at 7:27 PM, <[email protected]> wrote: > It is doubtful that temperature has anything to do with oxygen presence in > the case of plasma gasification. If there is free oxygen in the gasifier > environment at the chlorine release stage of heating, then the gasifier is > not working as a gasifier, but as a combustor. At the temperatures of the > syngas or producer gas in the gasifier, dioxins would still be stripped of > their oxygen by the hot hydrogen in the gas. There are significant > references to these effects including an Indian research report which shows > the reduction of dioxins from feeding black liquor into a gasifier. > > Sincerely, > Leland T. "Tom" Taylor > President > Thermogenics Inc. > > -----Original Message----- > From: Sunil Rawal <[email protected]> > To: Discussion of biomass pyrolysis and gasification < > [email protected]> > Sent: Fri, Sep 17, 2010 11:48 pm > Subject: Re: [Gasification] Dioxin formation > > I would say that in practcal way there is always presence of oxygen except > in case of Plasma gasification where temp is very high. If sufficient > oxygen > is not there then full burning is not possible and till date there is no > system available which can mix fuel and oxygen perfactly. > > Sunil Rawal > Achintya Projects & Services, > 160 Evershine Mall, Near Mindspace > Chincholi Bunder, > Malad (west) > MUMBAI 400064 INDIA > Cell# 0091-9967064472 > Telefax;- 0091 (0)22-42660929 > > On Fri, Sep 17, 2010 at 8:42 PM, <[email protected]> wrote: > > As part of the intermediate step to formaiton of dioxins, it is >> > necessary > >> to form chlorine dioxide. In the strongly reducing hydrogen rich >> > environment > >> of the gasifier, the oxygen is removed so that this intermediate is >> > not > >> formed and dioxins are not formed. In fact, gasifiers are a good >> > method of > >> reducing dioxins. >> Sincerely, >> Leland T. "Tom" Taylor >> President >> Thermogenics Inc. >> >> -----Original Message----- >> From: Sunil Rawal <[email protected]> >> To: Discussion of biomass pyrolysis and gasification < >> [email protected]> >> Sent: Fri, Sep 17, 2010 12:10 am >> Subject: Re: [Gasification] Gasification Digest, Vol 51, Issue 13 >> >> Dear All, >> >> Technically to avoid dioxine, we should prevent reaction of halogens ( >> Florine, chlorine, Iodine, Bromine) with nox and the temperature most >> suitable for it is around 330 to 280 deg cent. So whether you burn >> > material > >> in incinerator or plasma gasification process or your normal furnace, >> > if > >> you >> can aviod the said temperature zone in flue gas by sudden cooling or >> maintaining flue gas above 330 deg cent. to avoid formation of >> > dioxines. > >> Another method is scrub out these halogens from gas at higher >> > temperature > >> to >> avoid formation of dioxine. >> >> As formation of dioxene & PCB is based on halogens if raw material is >> > free > >> of halogen compound, there is no need to take care of temperature >> > zone. > >> I have worked and studied a lot on these issues and what I said above >> > are > >> only way to avoid >> formation of dioxene. >> >> Anybody interested in more information may contact me on my email id >> [email protected]. >> >> Sunil Rawal >> Achintya Projects & Services, >> 160 Evershine Mall, Near Mindspace >> Chincholi Bunder, >> Malad (west) >> MUMBAI 400064 INDIA >> Cell# 0091-9967064472 >> Telefax;- 0091 (0)22-42660929 >> >> 2010/9/15 Björn Dahlroth <[email protected]> >> >> A very important source of chlorine in municipal solid waste is simply >> >>> foodstuff that contain ordinary table salt. At high temperature >>> >> sodium > >> chloride will dissociate. The trick to avoid dioxins in the exhaust >>> >>> from >> >> modern incineration plants is first to achieve as complete combustion >>> >>> as >> >> possible and then quick cooling of the flue gas to decrease >>> >>> recombination >> >> plus the use of absorption materials and catalysts. This is common >>> technology today. Thermal gasification would probably be another >>> >>> story but >> >> the important thing is what you get when you finally burn the gas. >>> >>> Anyways >> >> if you work with waste like MSW the plants have to be very big for >>> economical reasons and gasification followed by any thermal >>> >>> electricity >> >> production will hardly achieve a higher total efficiency then a >>> >> modern > >> incineration plant where you have pressed up steam data to the >>> >>> possible >> >> limits with such kind of fuel. It is also an unavoidable fact that >>> >>> with >> >> common market price levels for electricity or combined electricity >>> >> and > >> district heating it will be necessary that waste treatment plants >>> >>> charge >> >> some kind of gate fee. This is what we have to pay to achieve a very >>> >>> low >> >> pollution of the environment. >>> Bjorn Dahlroth >>> Sweden >>> >>> -----Ursprungligt meddelande----- >>> Från: [email protected] >>> [mailto:[email protected]] För >>> [email protected] >>> Skickat: den 14 september 2010 21:00 >>> Till: [email protected] >>> Ämne: Gasification Digest, Vol 51, Issue 13 >>> >>> Send Gasification mailing list submissions to >>> [email protected] >>> >>> To subscribe or unsubscribe via the World Wide Web, visit >>> >>> >>> >>> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> >> >>> or, via email, send a message with subject or body 'help' to >>> [email protected] >>> >>> You can reach the person managing the list at >>> [email protected] >>> >>> When replying, please edit your Subject line so it is more specific >>> than "Re: Contents of Gasification digest..." >>> >>> >>> Today's Topics: >>> >>> 1. Re: Does anyboday know GEM3T120, waste gasification (Max Kennedy) >>> 2. Re: Does anyboday know GEM3T120, waste gasification >>> ([email protected]) >>> 3. Re: Does anyboday know GEM3T120, waste gasification (Arnt >>> >>> Karlsen) >> >> >>> >>> >>> ---------------------------------------------------------------------- > >> >>> Message: 1 >>> Date: Mon, 13 Sep 2010 16:56:48 -0700 (PDT) >>> From: Max Kennedy <[email protected]> >>> To: Discussion of biomass pyrolysis and gasification >>> <[email protected]> >>> Subject: Re: [Gasification] Does anyboday know GEM3T120, waste >>> gasification >>> Message-ID: <[email protected]> >>> Content-Type: text/plain; charset=us-ascii >>> >>> Dioxins are formed from chlorinated and organic compounds not >>> >> nitrogen > >> containing compounds. Vinyls are especially bad. >>> >>> >>> >>> >>> ________________________________ >>> From: Arnt Karlsen <[email protected]> >>> To: [email protected] >>> Sent: Mon, September 13, 2010 1:36:20 PM >>> Subject: Re: [Gasification] Does anyboday know GEM3T120, waste >>> >>> gasification >> >> >>> ... >>> >>> ..they and dioxins etc are produced when you burn fuels >>> containing organic nitrogen compounds. >>> >>> >>> >>> ------------------------------ >>> >>> Message: 2 >>> Date: Mon, 13 Sep 2010 22:38:04 EDT >>> From: [email protected] >>> To: [email protected], [email protected] >>> Subject: Re: [Gasification] Does anyboday know GEM3T120, waste >>> gasification >>> Message-ID: <[email protected]> >>> Content-Type: text/plain; charset="UTF-8" >>> >>> from Lewis L. Smith >>> >>> As I recall from my "boiler" days, the production of dioxins can be >>> >>> avoided >> >> in combustion processes by ? >>> >>> [1] Removing chlorinated materials from the feedstock. >>> >>> [2] Controlling temperatures, especially those of combustion and >>> >>> stack >> >> gasses. >>> >>> [3] All of the above. >>> >>> ### >>> >>> >>> ------------------------------ >>> >>> Message: 3 >>> Date: Tue, 14 Sep 2010 13:48:00 +0200 >>> From: Arnt Karlsen <[email protected]> >>> To: [email protected] >>> Subject: Re: [Gasification] Does anyboday know GEM3T120, waste >>> gasification >>> Message-ID: <[email protected]> >>> Content-Type: text/plain; charset=US-ASCII >>> >>> On Mon, 13 Sep 2010 16:56:48 -0700 (PDT), Max wrote in message >>> <[email protected]>: >>> >>> > Dioxins are formed from chlorinated and organic compounds not >>> > nitrogen containing compounds. Vinyls are especially bad. >>> >>> ..correct (some of these contain nitrogen ;o)), they are >>> broken down in a gasifier in about the same way, though. >>> >>> ..some (Danish?) R&D people played with FeCl type acids >>> in char beds to break down freon type gases, I read this >>> years back doing "my homework" on my own gasifier. >>> >>> -- >>> ..med vennlig hilsen = with Kind Regards from Arnt... ;o) >>> ...with a number of polar bear hunters in his ancestry... >>> Scenarios always come in sets of three: >>> best case, worst case, and just in case. >>> >>> >>> >>> ------------------------------ >>> >>> _______________________________________________ >>> Gasification mailing list >>> [email protected] >>> >>> >>> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> >> http://gasifiers.bioenergylists.org >>> >>> UNSUBSCRIBE HERE; >>> >>> >>> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> >> >>> >>> End of Gasification Digest, Vol 51, Issue 13 >>> ******************************************** >>> >>> >>> _______________________________________________ >>> Gasification mailing list >>> [email protected] >>> >>> >>> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> >> http://gasifiers.bioenergylists.org >>> http://info.bioenergylists.org >>> >>> UNSUBSCRIBE HERE; >>> >>> >>> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> >> >>> >>> >> >> -- >> _______________________________________________ >> Gasification mailing list >> [email protected] >> >> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> http://gasifiers.bioenergylists.org >> http://info.bioenergylists.org >> >> UNSUBSCRIBE HERE; >> >> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> >> >> >> >> _______________________________________________ >> Gasification mailing list >> [email protected] >> >> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> http://gasifiers.bioenergylists.org >> http://info.bioenergylists.org >> >> UNSUBSCRIBE HERE; >> >> http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > >> >> > > > -- > _______________________________________________ > Gasification mailing list > [email protected] > http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > http://gasifiers.bioenergylists.org > http://info.bioenergylists.org > > UNSUBSCRIBE HERE; > http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > > > > > _______________________________________________ > Gasification mailing list > [email protected] > http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > http://gasifiers.bioenergylists.org > http://info.bioenergylists.org > > UNSUBSCRIBE HERE; > http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > -- Achintya Projects & Services, 160 Evershine Mall, Near Mindspace Chincholi Bunder, Malad (west) MUMBAI 400064 INDIA Cell# 0091-9967064472 Telefax;- 0091 (0)22-42660929 _______________________________________________ Gasification mailing list [email protected] http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org http://gasifiers.bioenergylists.org http://info.bioenergylists.org UNSUBSCRIBE HERE; http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org
