Methane pyrolysis GHG allocation
- Chetandeep
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3 months 1 week ago #530
by Chetandeep
Methane pyrolysis GHG allocation was created by Chetandeep
Hi,
Wanted to know a little about GHG allocation of Hydrogen and Solid Carbon as by products of Methane Pyrolysis technology. Looking at 2 cases here:
1. Methane Pyrolysis using NG feedstock.
2. Methane Pyrolysis using NG and blended RNG (20% say) feedstock.
Any help on this would be great!!
Thank you
Wanted to know a little about GHG allocation of Hydrogen and Solid Carbon as by products of Methane Pyrolysis technology. Looking at 2 cases here:
1. Methane Pyrolysis using NG feedstock.
2. Methane Pyrolysis using NG and blended RNG (20% say) feedstock.
Any help on this would be great!!
Thank you
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- doconnor
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3 months 1 week ago #531
by doconnor
Replied by doconnor on topic Methane pyrolysis GHG allocation
Your first case is relatively straightforward.
You use the NG to hydrogen pathway and enter the NG and electricity requirements per GJ on the Input sheet. The carbon co-product is entered on the Coprods sheet in cell D130.
The allocation, energy of mass is set in B185. Mass allocation will assign most of the emissions to the carbon, energy allocation splits the emissions more equally between the hydrogen and the carbon.
To model the blend you would first have to model the RNG. Then the NG and electricity would be input on the Input sheet and the quantity of HNG would be added on the Alt Fuel Prod sheet in cell W85 or 86 depending on the type of RNG. The coproducts would be done the same way as the all NG case.
Regards
Don O'Connor
You use the NG to hydrogen pathway and enter the NG and electricity requirements per GJ on the Input sheet. The carbon co-product is entered on the Coprods sheet in cell D130.
The allocation, energy of mass is set in B185. Mass allocation will assign most of the emissions to the carbon, energy allocation splits the emissions more equally between the hydrogen and the carbon.
To model the blend you would first have to model the RNG. Then the NG and electricity would be input on the Input sheet and the quantity of HNG would be added on the Alt Fuel Prod sheet in cell W85 or 86 depending on the type of RNG. The coproducts would be done the same way as the all NG case.
Regards
Don O'Connor
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- Chetandeep
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3 months 1 week ago #532
by Chetandeep
Replied by Chetandeep on topic Methane pyrolysis GHG allocation
Thank you so much for this!
I was wondering if there was a system for a hybrid allocation of mass and energy? and would that even be the right approach? Just curious since I've read about the possibility where we can assign a weighted factor to the allocations in case we want to model a hybrid of the two.
What would be your opinion on it?
Thank you
Chetan
I was wondering if there was a system for a hybrid allocation of mass and energy? and would that even be the right approach? Just curious since I've read about the possibility where we can assign a weighted factor to the allocations in case we want to model a hybrid of the two.
What would be your opinion on it?
Thank you
Chetan
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- doconnor
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3 months 1 week ago #533
by doconnor
Replied by doconnor on topic Methane pyrolysis GHG allocation
ISO guidelines do provide a lot of flexibility with respect to which allocation approach to use. There is no one size fits all approach. However I have not heard of using a hybrid approach when there is only one co-product, as would be the case here.
I think that it also depends on the application for the co-product, some applications might be better suited to mass and others to energy.
Regards
Don O'Connor
I think that it also depends on the application for the co-product, some applications might be better suited to mass and others to energy.
Regards
Don O'Connor
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- Chetandeep
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3 months 2 days ago #534
by Chetandeep
Replied by Chetandeep on topic Methane pyrolysis GHG allocation
Thank you Don!
One final question,
If I'm blending some percentage of RNG into my NG feedstock for producing Hydrogen through Methane Pyrolysis, is it correct to assume that I can zero out the fraction of Methane Pyrolysis CO2 process emissions in the same ratio as the RNG-to-fossil RNG ratio?
So, if we’re mixing, say, 10% RNG, and the total CO2 process emissions are 1.02 kgCO2/kgH2, then we can reduce Scope 1 emissions to 0.9 x 1.02 = 0.92 kgCO2/kgH2.
Is this assumption correct?
Kind regards
Chetan
One final question,
If I'm blending some percentage of RNG into my NG feedstock for producing Hydrogen through Methane Pyrolysis, is it correct to assume that I can zero out the fraction of Methane Pyrolysis CO2 process emissions in the same ratio as the RNG-to-fossil RNG ratio?
So, if we’re mixing, say, 10% RNG, and the total CO2 process emissions are 1.02 kgCO2/kgH2, then we can reduce Scope 1 emissions to 0.9 x 1.02 = 0.92 kgCO2/kgH2.
Is this assumption correct?
Kind regards
Chetan
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- doconnor
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3 months 12 hours ago #535
by doconnor
Replied by doconnor on topic Methane pyrolysis GHG allocation
Yes you could do that.
Regards
Don O'Connor
Regards
Don O'Connor
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- Chetandeep
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2 months 4 weeks ago #536
by Chetandeep
Replied by Chetandeep on topic Methane pyrolysis GHG allocation
Thank you!
Much appreciated.
Kind regards
Chetan
Much appreciated.
Kind regards
Chetan
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