The document models sustainable gas supply chains to balance seasonal fluctuations in gas demand. It considers three scenarios: 1) flexible biogas production, 2) green gas storage within the supply chain, and 3) adding a second digester to produce gas during winter months. Graphs show the influence of seasonal swing factors on cost price for each scenario at two scales of production. While gas storage is very expensive, flexible biogas production and adding a second digester help meet seasonal demand more cost effectively. Further research into more flexible biogas production could improve supply chain sustainability.
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4. 27-6-2015 Modeling sustainable gas supply chains 4
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?
7. 27-6-2015 Modeling sustainable gas supply chains 7
Three considered scenarios
Scenario 1
Scenario 1: Flexible biogas production
time
mn
3/hr
time
mn
3/hr
8. 27-6-2015 Modeling sustainable gas supply chains 8
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)
9. 27-6-2015 Modeling sustainable gas supply chains 9
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
10. 27-6-2015 Modeling sustainable gas supply chains 10
Results overview scale 0.8E6
Influence Seasonal Swing Factor on cost price
11. 27-6-2015 Modeling sustainable gas supply chains 11
Results overview scale 2.4E6
Influence Seasonal Swing Factor on cost price
12. 27-6-2015 Modeling sustainable gas supply chains 12
Results flexible biogas prod.
Influence Seasonal Swing Factor on cost price
13. 27-6-2015 Modeling sustainable gas supply chains 13
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
15. 27-6-2015 Modeling sustainable gas supply chains 15
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)
16. 27-6-2015 Modeling sustainable gas supply chains 16
Results second digester
Influence Seasonal Swing Factor on cost price
Production second digester during winter months