Thanks, Ken! Someday we shall realize this is gasification, not alchemy. Great to know you are still out there.
Stay well. Bill Klein, 3i ----- Original Message ----- From: "Ken Calvert" <[email protected]> To: "Discussion of biomass pyrolysis and gasification" <[email protected]> Sent: Monday, August 23, 2010 4:09 AM Subject: Re: [Gasification] Compressibility Factor Mark, Forget it! When you drag on a gasifier you are working on a temperature of 800-900 degreesC. When gas gets hot it expands, and the velocity goes up and the pressure goes down, not up!. Have you ever measured the pressure through the throat of a gasifier? Furthermore, it means that to compress it you first have to cool it down. And even on a stationary setup you need an awful lot of cooling water, plus a heat exchanger if you don't want to get had up for polluting the local water supply. If its to be aircooled then you have to blow an awful lot of air which either sucks out the horsepower that you might have though thatyou have available, or worse still, it takes up electricity that you would use even more gas to generate. You burn up a lot of energy to cool the gas before you even start to compress, and then after even one stage of compression the gas is hot again, so that like the intercooler on a turbo, you need to cool it again, and again.. So any thought of calculating a compressibility factor starts needing a redhot computer. If you are prepared to gasifiy with oxygen and get synthesis gas you might come out of the exercise about even, but to do it with 50% nitrogen outof a downdraft gasifier means thatyou are pouring far more energy into the system than you will ever get out. "Madness." Two cents worth from a 73 year old who has thought it and tried it and come back a lot older and a lot wiser! Ken C. ----- Original Message ----- From: "Mark Anderson" <[email protected]> To: <[email protected]> Sent: Monday, August 23, 2010 7:46 AM Subject: [Gasification] Compressibility Factor > > Hey > > Does anyone know or can they work out a compressibility factor ( Z factor) > for a typical producer gas from a down draft biomass system? > > Mark > > > _______________________________________________ > Gasification mailing list > [email protected] > http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org > http://gasifiers.bioenergylists.org > http://info.bioenergylists.org _______________________________________________ Gasification mailing list [email protected] http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org http://gasifiers.bioenergylists.org http://info.bioenergylists.org _______________________________________________ Gasification mailing list [email protected] http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org http://gasifiers.bioenergylists.org http://info.bioenergylists.org
