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] 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
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