×
Welcome (13 Jul 2018)

Welcome to the GHGenius.ca forums.

NG to LPG - why are feedstock transmission emissions zero?

More
4 weeks 11 hours ago #63 by zsoltvigh
Hi,

Could someone please explain to me why the feedstock transmission emissions for the NG to LPG case in the Upstream Results HHV tab are zero? In the latest GHGenius model, in cell N12 the emission factor is manually typed in as zero. How can there be no emission associated with piping the gas from the field to the plant gate where the gas will then be separated out into C3+ or C2+.

From practical experience, there should be emissions associated with running the compression equipment along the pipeline route along with any associated fugitive methane emissions that are released.

I am trying to calculate the upstream GHG emissions associated with producing natural gas in AB, fractionating the propane out in Fort Saskatchewan, and transporting it via rail ~ 3,000 km.

Thanks for the help!

Please Log in or Create an account to join the conversation.

More
3 weeks 6 days ago #64 by doconnor
We do not have a data source that segregates that energy from the energy required to get the gas to the well head so we have to assume that the feedstock recovery energy includes the energy to move the gas from the well head to the gas processing plant.

Gas transmission energy in the model is about 1.5 g/km if that helps with the calculation.

Regards

Don O'Connor

Please Log in or Create an account to join the conversation.

More
1 week 5 days ago #70 by zsoltvigh
Hi Don,

Thanks for your response. I am still unclear as to how the model treats the upstream emissions from the plant gate for natural gas. Am I right to conclude that there are no emission factors in the model for taking gas from the wellhead to the fractionator?

If so, the number you included in your response (1.5 g/km), is this per GJ of natural gas? and is this a CO2 eq number? if so which GWP potential is used to generate this number? Thank you for your help!

Please Log in or Create an account to join the conversation.

More
1 week 4 days ago #71 by doconnor
Sorry that value doesn't make sense. I checked it again and the value in Alberta for gas transmission is 1.03 g CO2eq/GJ-km. That is using the 2007 GWPs where methane is 25.

Regards
Don O'Connor

Please Log in or Create an account to join the conversation.

Powered by Kunena Forum