Table 3 Comparison of heating demand, cooling demand, and integrated heat for the different process configurations
Unit | Five-stage evaporation | Biogas production | |||
|---|---|---|---|---|---|
Two-column distillation | Three-column distillation | Two-column distillation | Three-column distillation | ||
Heating demand | MW | 64.0 | 60.3 | 38.3 | 35.2 |
Cooling demand | MW | 64.8 | 59.1 | 39.9 | 33.7 |
Heat integration | MW | 91.9 | 125.9 | 69.5 | 103.4 |
Pinch point | °C | 116.4 | 116.6 | 116.4 | 142.9 |
Minimum energy consumption per kilogram of ethanol | MJ/kgEtOH | 18.4 | 17.2 | 11.1 | 10 |
Process configuration | A | B | C | D | |