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PyPSA
Investigate flexibility of Fischer-Tropsch and methanation
Christian Breyer says methanation is flexible, Fischer-Tropsch has to run 24/7 (presumably because of some thermal process).
Can implement by setting p_min_pu = p_max_pu = 1.0 for Fischer-Tropsch units.
Note that with H2 salt caverns, FT runs 100% except in Jan/Feb anyway, since big H2 buffer allows us to save FT capital costs.
| Process | Ramping | Must-run | Source |
|---|---|---|---|
| Alkaline electrolyser | ~minutes | No | DEA renewable fuels (2020) |
| methanol synthesis | not really | Yes, ~95% | DEA renewable fuels (2020) |
| Fischer Tropsch synthesis | no | Yes,>~93% | DEA renewable fuels (2020) |
| methanation | not really | Yes | DEA renewable fuels (2020) |
| Haber-Bosch synthesis | not at the moment (suggested possible with existing processes) | Yes (shutdown/reduction suggested possible with existing processes | Götz et al (2016) |
| LOHC (DBT) hydrogenation | Probably < minutes | No | Niermann et al (2019)/Runge et al (2019) |
As always new process designs are being suggested and developed but have (very) low TRL at the moment. Above properties can be understood for current prevailing or promising processes.
