1. Modeling sustainable gas
supply chains
-
Balancing supply and
demand
J. Bekkering

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Considered green gas supply chain
‘Standard’ calculation model, constant gas production

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Cost price
At constant production

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Seasonal fluctuation gas demand
-
time
mn
3/hr
time
tonnes/yr
time
tonnes
time
mn
3/hr
time
mn
3/hr
What is the cost price of green gas as a function of
scale, when the seasonal fluctuation in gas demand
should be met by a green gas supply chain?

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How to model seasonal gas demand
Data Sep. 2009 – Sep. 2010

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Range of Fourier curves
Demand (theoretical)

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Three considered scenarios
Scenario 1
Scenario 1: Flexible biogas production
time
mn
3/hr
time
mn
3/hr

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Three considered scenarios
Scenario 2
Scenario 1: Flexible biogas production
Scenario 2: Green gas storage within supply chain
Gas storageQ ≦ 10,000 Nm3: pipes 8.5 bar
10,000 < Q < 300,000 Nm3: pipes 100 bar (and
compression)

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Three considered scenarios
Scenario 3
Scenario 1: Flexible biogas production
Scenario 2: Green gas storage within supply chain
Scenario 3: Adding second digester (with 6 months production)
Production second digester only during winter months

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Results overview scale 0.8E6
Influence Seasonal Swing Factor on cost price

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Results overview scale 2.4E6
Influence Seasonal Swing Factor on cost price

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Results flexible biogas prod.
Influence Seasonal Swing Factor on cost price

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Conclusions/Further research
-
- Increasing SSF means large storage need
- Gas storage is very expensive
- Green gas production (still?) preferably near business areas
- Research into flexible biogas production makes sense

14. The
End

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Results green gas storage
Influence Seasonal Swing Factor on cost price
Q ≦ 10,000 Nm3: pipes 8.5 bar
10,000 < Q < 300,000 Nm3: pipes 100 bar (and compression)

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Results second digester
Influence Seasonal Swing Factor on cost price
Production second digester during winter months