Spray Continuous Pan (SCP®)
Crystallization consumes major portion of heat energy in a Sugar Manufacturing Process. Spray Continuous Pan (SCP®) is efficiently developed for optimizing evaporative crystallization of sugar solutions. Vertical Continuous Vacuum Pan (SCP®) offers high efficiency without any compromise on the process parameters. Multi-chambered mechanically stirred Vertical Continuous Pan has several advantages over Horizontal Continuous Pans.
Process Performance Parameters Of Scp
| DESCRIPTION | PARAMETER |
|---|---|
| Total Height of SCP® | 25-35 m |
| Diameter of Calandria | > 4 m |
| Heating Surface per Chamber | 250-1000 m² |
| No. of Chambers | 3-8 Nos. |
| Provision for Graining | 2 Chambers |
| Total Holding Volume per Chambers | > 50 m3 |
| Designed Heating Steam Temperature/Pressure | 65-90°C/ 25-70 kPaA |
| Designed Outlet Vapour Temperature/Pressure | 40-60°C / 7.5-20 kPaA |
| Feed Liqour Concentration | 60-85 % (Total Solids) |
| Effective Temperature Difference between Boiling | 5-25°C |
| Crystal Content Range | 30-60 % |
| Massecuite out | By gravity to Pug Mill |
Distinct Features:
- Suitable for all types of massecuites (Raw, Refined, A, B and C).
- Operates with low pressure vapours of 200 mbar – 500 mbar.
- Essential wetted parts in stainless steel to reduce colour additions.
- Bottom mounted Mechanical Circulator for uniform crystal size.
- Compact size with self supporting structure.
- Honeycomb calandria for improved circulation.
- Minimum Coefficient of Variation (C.V.) [28-30]
- Liquor handling from 50 – 85% concentration due to vigorous circulation.
- Sugar yield of Pan – 55% - 60% with 90-91% brix.
- Chamber bypaas arrangement for CIP. Fully automated intelligent system for precise operation.
- Flexibility of including seed pan and receiving crystallizer within the tower (optional).
- Flexiility to operate on overflow or bottom discharge.
- Modular chamber pre-fitted with instruments to reduce erection time.
Process Advantages:
- Better massecuite quality
- Improved sugar recovery
- Improved evaporation and crystallization rates with low temperature / pressure vapours Continuous operation with online cleaning
- Lesser hydrostatic effect
- Provision of seed pan with uniform seeding
- Availability for all process ranges.
Steam & Power Economy/ Energy Efficiency
Steam economy:
SCP can operate with vapours of 300mbar – 500mbar (~85 deg C) vapour bled from 3rd or 4th effect of evaporator train. Capability to operate with low temperature vapours ensures process steam economy.
Power economy:
The installed power for complete unit is around 250 - 275 kW. Less operating power required because of planetary drive circulators fitted with VFD.
Design Advantages:
- Compact modular single tower design
- Complete instrumentation
- Stainless steel wetted parts
- Light gauge self-supported structure
- Vertical installation
Control Advantages:
The control scheme of a continuous pan is quite different from a batch type pan. SCP has all essential instrumentation that gives flawless performance.
- Ease of operation.
- Integration with any third party control system.
- Provision for flow, temperature, pressure, level and consistency measurement for each chamber.
- Process parameters control for individual chambers.
- Fail safe provisions in case of error / failure.
- Inbuilt historic alarms, historic trends and report generation provision.
- Auto cleaning / rinsing cycle of valves & sensors to minimize shutdowns.
- Individual control of vapor in and out to achieve consistent boiling.