Hi, Mark and my friends and colleagues. EUREKA!
"... But it may improve overall thermal efficiency or gas quality by helping to properly condition feedstock. We all wish that we could make a water-shift reaction work with just CO2 and water!" The above has been observed for many years and more than a few hours and dollars have been spent in research, attempting to improve upon or alter the phenomenon. However, the fact remains that the key to the quality of producer gas lies with proper feedstock preparation and an architecture that will support and enable the desired gas quality. There is no magic and there are no silver bullets, but all of the principles are there to be learned and relentlessly practiced and they work!, as long as we don't attempt some sort of gasification alchemy. My very best wishes for success in your never ending search. Bill Klein, 3i ----- Original Message ----- From: "Mark Ludlow" <[email protected]> To: <[email protected]>; "'Discussion of biomass pyrolysis and gasification'" <[email protected]> Sent: Sunday, October 24, 2010 2:49 PM Subject: Re: [Gasification] reclaiming exhaust heat Hi Greg, Given the fact that I.C. exhaust has a relatively high dew point (I'm certain you've seen your share of rusted-out mufflers!), I think that a useful system for heat recovery has to obey some basic principles. First, there is a distinction between sensible heat (the heat available in dry air) and latent heat (the heat released by condensation of water vapor). Latent heat is a much more potent source of energy transfer because it involves nucleate condensation which transfers heat very effectively to the condensing substrate. But it also transfers water which is what we are trying to remove, yes? And an indirect heating system is a bother and probably not worth the effort. To get a grasp of the energy available after a little air-exposed plumbing, try roasting a weenie at the tip of your exhaust system of your F350. Might as well be smoking a ham shank! For what it's worth, counter-current tunnel dryers employ the following logic: Hot, dry (low RH) air is the last thing to contact the product. At the other end of the dryer, the drying air is nearly saturated with moisture. This moist air contacts the incoming (cool) feedstock and condenses on it, adding (not subtracting!) surface moisture as well as the enthalpy of condensation. While it does nothing to make the feedstock drier, it does pre-heat it and ensures that the maximum combination of latent and sensible heat is extracted from the IC exhaust stream. As the feedstock moves forward it encounters progressively hotter (and lower RH) gas which has a lower H2O partial pressure (encouraging evaporation of the surface moisture added as well as internal moisture) but has less total thermal energy to transfer. The belabored point is that if it is exhaust heat that one wishes to recover, then the distinction between pure thermal recovery and chemical recovery is probably minimal if the IC engine is running with sufficient excess oxygen to allow the conversion of all of the CO to CO2. Recycling exhaust gas rich in CO2 and water vapor won't add calorific value to the gasification zone reactions. But it may improve overall thermal efficiency or gas quality by helping to properly condition feedstock. We all wish that we could make a water-shift reaction work with just CO2 and water! Best, Mark -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg Manning Sent: Sunday, October 24, 2010 5:09 AM To: 'Discussion of biomass pyrolysis and gasification' Subject: Re: [Gasification] reclaiming exhaust heat I would be interested in receiving a summary document on the outcome of this event, could you send me a copy in e-mail once the event is complete ? Kindest regards. Greg Manning, Canadian Gasifier Ltd. Building Hi-Performance Gasifiers, Since 2001 Brandon, Manitoba, Canada 1 (204) 726-1851 -----Original Message----- From: [email protected] [mailto:[email protected]]on Behalf Of Director, MIT, Aurangabad Sent: Friday, October 22, 2010 5:33 AM To: Discussion of biomass pyrolysis and gasification Subject: Re: [Gasification] reclaiming exhaust heat dear dr s c bhattacharya, thank you very much, the info. and enthusiasm, you have shown in this subject. i am planning to attend this conference. at the moment i am touring in china, but coming back to india on 24th instant. will you pl elaborate with your views, that will help me to develop myself in this field. let me inform that i have an experimental gasifier fabricated, but not getting the desired results, as yet. wishing you happy festive season. sincerely, y a kawade-------------------------------------------------------------------- On Fri, Oct 22, 2010 at 7:30 AM, Prof. S.C. Bhattacharya <[email protected]> wrote: > Is anybody planning to attend RE Conference in Delhi? > http://www.direc2010.gov.in/direc2010.html? > > World Bioenergy Association (WBA) is organising a side-event in DIREC > on 28th of October 2010 at 12.30-14.00. The theme is "Possibilities > to increase the supply of sustainable Biomass for Energy". The event > includes a discussion on barriers to bioenergy in India. > > I will be happy to provide more details to any one interested. > > S.C. Bhattacharya > Member, WBA Board > -- > Prof. S.C. Bhattacharya, Ph.D. (Cambridge, UK) > President, International Energy Initiative > Adjunct Professor, Indian Institute of Social Welfare and > Business Management (IISWBM), Kolkata India. > Associate Editor, Solar Energy > Former Professor & Coordinator, Energy Program, > Asian Institute of Technology > 164/6 Prince Anwar Shah Rd, Lake Gardens, Kolkata 700045 > Tel: +91-33-24228645; mobile: +91-9831476944 > _______________________________________________ > The Gasification list has moved to > [email protected] - please update your email contacts to reflect the change. > Please visit http://info.bioenergylists.org for more news on the list move. > Thank you, > Gasification Administrator > -- y a kawade, mit, aurangabad. ------------------------------------------------------------ _______________________________________________ The Gasification list has moved to [email protected] - please update your email contacts to reflect the change. Please visit http://info.bioenergylists.org for more news on the list move. Thank you, Gasification Administrator No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.862 / Virus Database: 271.1.1/3203 - Release Date: 10/21/10 13:34:00 _______________________________________________ The Gasification list has moved to [email protected] - please update your email contacts to reflect the change. Please visit http://info.bioenergylists.org for more news on the list move. Thank you, Gasification Administrator _______________________________________________ The Gasification list has moved to [email protected] - please update your email contacts to reflect the change. Please visit http://info.bioenergylists.org for more news on the list move. Thank you, Gasification Administrator _______________________________________________ The Gasification list has moved to [email protected] - please update your email contacts to reflect the change. Please visit http://info.bioenergylists.org for more news on the list move. Thank you, Gasification Administrator
