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
