The IPCC uses 0.67 kg of CH4/M3 CH4 as a standard density conversion. So basically, use the volume of biogas total (e.g 1000 m3), multiplied by the % CH4 (e.g. 65%), and then multiple by the density converter (0.67 kgCH4/m3CH4). Paul used .628 and 70% CH4 (as there are plenty of variations in these numbers), so: 1000*.7*.628 = 440 kg.
Best Regards, A On Thu, Mar 31, 2011 at 9:11 AM, Murali Krishna <[email protected]>wrote: > > > Good day Paul, > > Thank you for your prompt reply. > > How have you arrived at 440 kg weight from 700 m3 of methane? Will you > please elaborate? > > Regards, > > Krishna > > > > > On Thu, Mar 31, 2011 at 3:52 PM, Paul Harris > <[email protected]>wrote: > >> G’day Krishna, >> >> >> >> I think the different figures are for different pressures and/or >> temperatures, as conventions vary. I have a value of 0.628 kg/m3 at 1.103 >> kPa and 20C, so 1000 m3 of biogas will become 737 cubic metres of 95% >> methane. Ignoring the CO2 will give 700 m3 of methane, weighing about 440 >> kg. This will be the mass whatever the pressure (unless you have a leak!). >> At 180 bar the volume will be approximately 4 cubic metres (at 20C). >> >> >> >> Hope this helps, >> >> HOOROO >> >> >> >> Mr. Paul Harris, Room 202 Charles Hawker Building, Faculty of Sciences, >> The University of Adelaide, Waite Campus, PMB 1, Glen Osmond SA 5064 Ph >> : +61 8 8303 7880 Fax : +61 8 8303 4386 >> mailto:[email protected] <[email protected]> >> http://www.adelaide.edu.au/directory/paul.harris >> >> >> >> CRICOS Provider Number 00123M >> >> This email message is intended only for the addressee(s) and contains >> information that may be confidential and/or copyright. If you are not the >> intended recipient please notify the sender by reply email and immediately >> delete this email. Use, disclosure or reproduction of this email by anyone >> other than the intended recipient(s) is strictly prohibited. No >> representation is made that this email or any attachments are free of >> viruses. Virus scanning is recommended and is the responsibility of the >> recipient. >> >> >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *Murali Krishna >> *Sent:* Thursday, 31 March 2011 4:47 PM >> *To:* [email protected] >> *Subject:* [Digestion] density of methane and bottling >> >> >> >> Hi, >> >> I shall thank you to clarify the follwoing: >> >> The density of methane is shown as 0.67, 0.72 and 1.2 on the web. >> Presuming that 1000 cubic meter of methane at 70% in biogas, purified upto >> 95% and then compressed what will be the output of gas in kgs. It is likely >> to be compressed at three stages upto 180 bar pressure. >> >> Krishna >> >> _______________________________________________ >> Digestion 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/digestion_lists.bioenergylists.org >> >> for more information about digestion, see >> Beginner's Guide to Biogas >> http://www.adelaide.edu.au/biogas/ >> and the Biogas Wiki http://biogas.wikispaces.com/ >> >> >> > > _______________________________________________ > Digestion 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/digestion_lists.bioenergylists.org > > for more information about digestion, see > Beginner's Guide to Biogas > http://www.adelaide.edu.au/biogas/ > and the Biogas Wiki http://biogas.wikispaces.com/ > > > -- Alexander Eaton Sistema Biobolsa IRRI-Mexico RedBioLAC Mex cel: (55) 11522786 US cel: 970 275 4505 [email protected] [email protected] sistemabiobolsa.com www.irrimexico.org www.redbiolac.org
_______________________________________________ Digestion 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/digestion_lists.bioenergylists.org for more information about digestion, see Beginner's Guide to Biogas http://www.adelaide.edu.au/biogas/ and the Biogas Wiki http://biogas.wikispaces.com/
