Phase 2: Project Engineering
Step 06: Basic Engineering
Process Design Basis, Utility Sizing, and Mass & Energy Balances.
1. Steam & Utility Balance (60 KLPD Basis)
A 60 KLPD grain-based distillery's steam consumption targets ~5.65 kg per litre of alcohol, totaling ~14.05 MT/hr. This is typically met by a 15 TPH boiler operating at 45 kg/cm².
| Process Section | Steam Rate (kg/L) | Consumption (MT/hr) |
|---|---|---|
| Liquefaction | 0.7 kg/L | 1.75 MT/hr |
| Distillation | 1.8 kg/L | 4.5 MT/hr |
| Molecular Sieve Dehydration | 0.55 kg/L | 1.4 MT/hr |
| Evaporation (standalone) | 1.0 kg/L | 2.5 MT/hr |
| DDGS Dryer | 1.6 kg/L | 4.0 MT/hr |
| Total | ~5.65 kg/L | ~14.05 MT/hr |
Technical Nuance: While a full standalone cogeneration plant is often uneconomical below 100 KLPD, integrating a 1.5 MW backpressure turbine to capture power from the boiler's existing steam letdown is a highly recommended, low-cost efficiency measure.
2. Water Balance
Treatment Capacity
- WTP Capacity: 1,000 m³/day
- Reject WTP: 120 m³/day
- Recovery Rate: ~65% via ETP
Fresh Water Draw
- EC Allowance: ~4.5 L/L produced
- Net Benchmark: ~4 L/L (industry avg)
- Total Site Draw: 270,000 - 420,000 L/day
3. Future-Proofing the Plant Layout
The universal design rule dictates that physical space must be reserved now for Phase 2 additions, even if they are not built in Phase 1:
- Boiler House: Reserve space for a future larger cogeneration turbine.
- ZLD/Effluent Section: Reserve space for a future biogas digester and CBG upgrading unit.
- Distillation Section: Allocate area for an ENA rectification column addition.
- Civil Foundations: Size pipe racks with load margins anticipating future throughput.