[Digestion] density of methane and bottling

[Alexander Eaton]

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 <bmkrishna6 at gmail.com>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 <paul.harris at adelaide.edu.au>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:paul.harris at adelaide.edu.au <paul.harris at adelaide.edu.au>
>> http://www.adelaide.edu.au/directory/paul.harris
>>
>>
>>
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>> *From:* digestion-bounces at lists.bioenergylists.org [mailto:
>> digestion-bounces at lists.bioenergylists.org] *On Behalf Of *Murali Krishna
>> *Sent:* Thursday, 31 March 2011 4:47 PM
>> *To:* Digestion at bioenergylists.org
>> *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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>> Beginner's Guide to Biogas
>> http://www.adelaide.edu.au/biogas/
>> and the Biogas Wiki http://biogas.wikispaces.com/
>>
>>
>>
>
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> 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

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