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Batch Vacuum Pan Automation

Batch Vacuum Pans: Absolute Pressure Control

The absolute pressure in the vacuum pans is maintained by adjusting the flow of injection water that is developing the vacuum in the pans. The Vacuum set point remains constant when the strike is ON. When the strike is complete, the Setpoint goes to zero, via Setpoint Program, before the vacuum is broken and pan is dropped.
The Flow Control Valve on Injection Water line is PID controlled looking at the Absolute Pressure in the Vacuum Pan.


Batch Vacuum Pans: Temperature Control

The Temperature in the vacuum pans is maintained by adjusting the flow of Vapors that are flowing through the calendria of the pans. The Temperature Setpoint remains constant when the strike is ON. As soon as the strike is complete, the Setpoint goes to zero, via Setpoint Program, before the vacuum is broken and pan is dropped.
Similar loops are needed for all batch type vacuum pans. All BOQs for this loop should, therefore, be counted six times for the A, A/B, B, C, A/B Seeding, and C Seeding pans.
Control

The Flow Control Valve on Vapor line is PID controlled looking at the Temperature in Vacuum Pan.

Batch Vacuum Pans: Super-saturation Indication

Super-saturation of the Massecuite in the vacuum pan is estimated by calculations based on Massecuite Brix, Temperature, and Boiling Point Raise. The Super-saturation in the vacuum pans is maintained by adjusting the ratio of feed and dilution water through solenoid valves into the pans. The Super-saturation set point remains constant when the strike is on, and the level has reached 35%. As soon as the strike is complete, the Setpoint goes to zero, via Setpoint Program, before the vacuum is broken and pan is dropped.
Similar loops are needed for all batch type vacuum pans. All BOQs for this loop should, therefore, be counted six times for the A, A/B, B, C, A/B Seeding, and C Seeding pans.
Control

An output (internal) is generated, for use of the Level Control Loop, through a PID Algorithm and a complex mathematical calculation based on Brix, Temperature, and Viscosity.

Batch Vacuum Pans: Level Control and Set Point Program

Level of the Massecuite in the vacuum pan is maintained by adjusting the flow of feed and dilution water into the pans, through solenoid valves. The Level set point varies with the Set Point Program Profile that starts with beginning of the strike. When the level reaches 35% and required super-saturation is achieved, seed valve opens for a specified period of time. The level set-point rises in ramps to 95%.
As soon as the strike is complete, the set-point goes to zero, via Set Point Program, before the vacuum is broken and pan is dropped. Vacuum Break and Pan Discharge valves are opened to drop the pan. After that, washing steam and hot water are let into the pan and stirrer is turned on. The Vacuum Break and Pan Discharge valves are closed on completion of the washing cycle, and absolute pressure is established into the pan. Next strike follows.
Different Set Point Programs, called RECIPES, are fed into the control systemís database to cater for:

A, B, and C regular and seeding strikes, availability of syrup, various kinds of molasses, runoff, etc., and their purity and brix, and availability of Crystallizer and magma.
The level in the pan is PID controlled by time proportional switching of the feed and water solenoid valves looking at the actual level in the pan and the set-point determined by the SPP. The seeding, dropping, washing, and striking cycles are interlocked according the fixed times and lags produced by the guaranteed soak bands in the SPP.
 

 

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