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Table 2.
Summary of the heat consuming operations in rapeseed crushing (per ton of seeds).
| Step | Material | Change | Heat required (MJ.t−1) | Steam consumption (MJ.t−1) |
|---|---|---|---|---|
| Conditioning | Seeds | T°: 15 → 60 °C | 78 | 36.6 |
| Cooking | Flakes | T°: 55 → 105 °C | 110 | 53.4 |
| Vaporization of 30kg of water | 66 | 32.2 | ||
| Air (dry) for drying | T°: 20 → 100 °C | 8 | 3.9 | |
| Total preparation | 263 | 126 | ||
| Desolventization | Meal | T°: 55 → 105 °C | 52 | 26.1 |
| hexane | T°: 55 → 69 °C | 8 | 3.9 | |
| Vaporization | 75 | 37.6 | ||
| Steam | Sparged | 77 | 27.5 | |
| Condensed | 38 | 13.5 | ||
| Distillation | Miscella | T°: 55 → 69 °C | 8 | 2.7 |
| Oil | T°: 69 → 110 °C | 10 | 3.6 | |
| Hexane | Vaporization | 122 | 58.9 | |
| Enthalpy supplied by the gas from the DT | –104 | –48.9 | ||
| Total extraction | 284 | 125 | ||
| Losses (5%) | 27 | 12.5 | ||
| Total preparation + extraction | 574 | 264 | ||
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