On Wed, 15 Sep 2010 11:58:42 +0200, Björn wrote in message <5c6af79d4a024ca3a0f33f6b78911...@bj00120051220>:
> 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 ..yes, in thermochemical gasifiers we get the last of these 2: NOx, NitrogenOxides "Fuel containing chemically bound Nitrogen decomposes through cyanide, HCN to: either CxHyNz + heat ---> 2 HCN + 3 O2 ---> H2O + 2 CO2 + 2 NO, (combustion in oxidizing process environment, NOX is formed) or CxHyNz + heat ---> 2 HCN + O2---> H2 + 2 CO + N2, (thermochemical gasification in reducing process environment, No NOX, N2 is formed)" Source subchapter: 2.3 Kväveoxiderna. [Nitrogenoxides] source chapter: Inverkan av vatten och väte i förbränningsprocessen [Effect of water and hydrogen in (the) combustion process], by Docent Mikko Hupa, Åbo Akademi, source book: Vattnets roll i förbränningen [Impact of water in combustion], IVA Rapport 324, 27 May 1986 Isbn 91 7082 417 7 > 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. ..benchmark data? > 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. ..I agree gate fee is nicer than having to pay for fuel. ;o) -- ..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 http://info.bioenergylists.org UNSUBSCRIBE HERE; http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org
