Continued; that reaction is endothermic. H.
> On Apr 13, 2015, at 10:45 AM, Henri <[email protected]> wrote: > > Hi Jeff > The reaction , hence the headline of the discussion, I am referring to is the > elimination of Carbon monoxide. > CO + H2O <=>CO2+H2. That reaction alone is exothermic. Favourable at low > temperatures (t<200c) > I assume you are referring to a charcoal Gasifier. If that be the case, are > there not combustible by products from the charcoaling that can be oxidized > to maintain the 900c heat needed to gasify the charcoal on steam alone. > Because aparently superheated steam plus a char bed of 930c will gasify > charcoal and yes that > > > > Quoting wiki > Temperature dependenceEdit > > > The water gas shift reaction is a moderately exothermicreversible reaction. > Therefore with increasing temperature the reaction rate increases but the > conversion of reactants to products becomes less favorable.[6] Due to its > exothermic nature, high carbon monoxide conversion is thermodynamically > favored at low temperatures. Despite the thermodynamic favorability at low > temperatures, the reaction is kinetically favored at high temperatures. The > water-gas shift reaction is sensitive to temperature, with the tendency to > shift towards reactants as temperature increases due to Le Chatelier's > principle. Over the temperature range 600 – 2000 K, the logarithm of the > equilibrium constant for the WGSR is given by the following equation:[3] > > > > > >> On Apr 13, 2015, at 9:05 AM, Jeff Davis <[email protected]> wrote: >> >> If the gasifier is air blown with some steam added the reaction will remain >> exothermic. If the gasifier is brought up to temp with air and then switched >> to steam blown then the reaction will be endothermic on pure steam and will >> need to be toggled back to air blown hence town gas. >> >> >> Jeff >> >> >> >> ______________________________________________ >> "Once an owner has got used to charcoal gas he will never revert to the more >> expensive fuels", Geo Bray >> >>> On Apr 12, 2015 9:37 PM, "Viswanathan KS" <[email protected]> wrote: >>> Dr Karve wrote >>> Quote >>> --------. When hot charcoal is treated with steam, it produces coal >>> gas, consisting of a mixture of carbon monoxide and hydrogen. We have >>> used this reaction in an experimental stove, in which the coal gas is >>> used as fuel. Can anybody suggest a simple method of removing carbon >>> monoxide from coal gas? >>> Unquote >>> >>> Is this reaction sustainable or will the charcoal fire get extinguished due >>> to prolonged passage of steam? >>> >>> The answer to this question should determine the continuation of the >>> discussion. >>> >>>> On Mon, Apr 13, 2015 at 6:54 AM, Henri Naths <[email protected]> >>>> wrote: >>>> Hello Anand >>>> >>>> Some of the CO can be removed using the water gas reaction. This well >>>> known stoichiometry of the water the water-gas shift reaction is : co+h20 >>>> <=>h2+co2+heat ( exothermic) >>>> >>>> In an efficient heat integrated scheme , the heat of the reaction can be >>>> recovered as superheated high pressure steam. >>>> >>>> H. >>>> >>>> >>>> >>>> >>>> >>>> >>>>> On Apr 11, 2015, at 9:14 PM, Anand Karve <[email protected]> wrote: >>>>> >>>>> Coal gas as automotive fuel >>>>> Agriculture, forests and urban centres in India produce annually >>>>> about 1000 million tons of combustible waste biomass. Its energy >>>>> content is almost 3 times as much as the petroleum that we currently >>>>> use in our country. Samuchit Enviro Tech developed a simple and >>>>> nonpolluting technology for converting combustible biomass into >>>>> charcoal. When hot charcoal is treated with steam, it produces coal >>>>> gas, consisting of a mixture of carbon monoxide and hydrogen. We have >>>>> used this reaction in an experimental stove, in which the coal gas is >>>>> used as fuel. Can anybody suggest a simple method of removing carbon >>>>> monoxide from coal gas? >>>>> Yours >>>>> A.D.Karve >>>>> >>>>> *** >>>>> Dr. A.D. Karve >>>>> >>>>> Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com) >>>>> >>>>> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI) >>>>> >>>>> _______________________________________________ >>>>> Gasification mailing list >>>>> >>>>> to Send a Message to the list, use the email address >>>>> [email protected] >>>>> >>>>> to UNSUBSCRIBE or Change your List Settings use the web page >>>>> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >>>>> >>>>> for more Gasifiers, News and Information see our web site: >>>>> http://gasifiers.bioenergylists.org/ >>>> >>>> _______________________________________________ >>>> Gasification mailing list >>>> >>>> to Send a Message to the list, use the email address >>>> [email protected] >>>> >>>> to UNSUBSCRIBE or Change your List Settings use the web page >>>> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >>>> >>>> for more Gasifiers, News and Information see our web site: >>>> http://gasifiers.bioenergylists.org/ >>> >>> >>> _______________________________________________ >>> Gasification mailing list >>> >>> to Send a Message to the list, use the email address >>> [email protected] >>> >>> to UNSUBSCRIBE or Change your List Settings use the web page >>> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >>> >>> for more Gasifiers, News and Information see our web site: >>> http://gasifiers.bioenergylists.org/ >> _______________________________________________ >> Gasification mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >> >> for more Gasifiers, News and Information see our web site: >> http://gasifiers.bioenergylists.org/ > _______________________________________________ > Gasification mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/
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