Dear Colleagues, During the years that we have been playing with producer gas, both in engines for power generation and for process heat in timber kilns, at no time has NOx been an emission problem. Although gasifier temperatures are high, it appears that it just doesn't happen in this process although I suppose anything is possible given certain conditions existing. The adiabatic flame temperature of clean producer gas ie tar free has never exceeded 1100 degrees Celcius, in our experience, and in fact is one of the measures we use to check to see if tar is present in the gas stream. Hope this helps. Doug Williams FLUIDYNE GASIFICATION - Gasification List Archives: http://www.crest.org/discussion/gasification/200202/ Gasification List Moderator: Tom Reed, Biomass Energy Foundation, Reedtb2@cs.com www.webpan.com/BEF List-Post: <mailto:gasification@crest.org> List-Help: <mailto:gasification-help@crest.org> List-Unsubscribe: <mailto:gasification-unsubscribe@crest.org> List-Subscribe: <mailto:gasification-subscribe@crest.org> Sponsor the Gasification List: http://www.crest.org/discuss3.html - Other Gasification Events and Information: http://www.bioenergy2002.org http://www.crest.org/articles/static/1/1010424940_7.html Bioenergy http://www.crest.org/articles/static/1/1011975339_7.html Gasification http://www.crest.org/articles/static/1/1011975672_7.html Carbon