Table 4
Surrogate model response vs. full simulation model response for (a) CO2 specific energy consumption (for reboiler), (b) reboiler duty and (c) reboiler temperature.
| Method | MEA conc | MEA rate | MEA dT | L/R dT | Regen pressure | Boil-up ratio | Flue gas temp. | Sur. Spec. energy | Sim. Spec. energy | Error (–) |
|---|---|---|---|---|---|---|---|---|---|---|
| (w/w %) | (m3/h) | (°C) | (°C) | (bar) | (–) | (°C) | (MJ/kg CO2) | |||
| DE | 29.8 | 359.2 | 6.69 | 5.1 | 1.85 | 0.134 | 40.0 | 3.428 | 3.421 | 0.002 |
| trust-constr | 30.0 | 345.5 | 6.54 | 5.1 | 1.83 | 0.141 | 40.0 | 3.398 | 3.407 | −0.002 |
| COBYLA | 30.0 | 359.2 | 6.54 | 5.0 | 1.85 | 0.132 | 40.0 | 3.410 | 3.370 | 0.012 |
| SLSQP | 30.0 | 359.2 | 6.54 | 5.0 | 1.85 | 0.132 | 40.0 | 3.410 | 3.370 | 0.012 |