 |
|
 |
|
|
 |
Controlling and regulating continuous processes
|
|
DESCRIPTION
This unit covers the following areas :
REGULATING
– Vacuum regulation
– Flow rate regulation
– Temperature regulation
– Level regulation
Each regulation loop consists of :
– One sensor
– One actuator
– One controller
– One perturbation
CONTROLS
– Manual controls
– Sequential controls
– On/off controls
COMMANDS
– Hand operated
– Computerized control
|
OPERATING MODE
Each regulation loop can be adjusted by hand or by computer.
The whole process is a closed circuit, without any consumption of
raw material.
|
|
TECHNICAL SPECIFICATIONS
1- Heating tube – evaporator (borosilicate glass)
2- Condenser (borosilicate glass)
3- Light phase receiver : water
4- Heavy phase receiver : glycerine
5- 5 L-supply tank (polyethylene)
6- Electric preheater
7- Supply pumps
2 exchangeable centrifugal pumps: maintenance with turbine flow meter
(0-10 L/h)
8- 3 receivers (borosilicate glass)
one for the heavy phase on the bottom condenser: 0.5 L
one for the light phase after the condenser: 0.5 L
one for the final receipt with the level sensors: 0.5 L
9- Re-circulating pump (to the tank)
Centrifugal pump with a water inlet connection piece
10- Two vacuum pumps
1) 3.9 m3/h – P=0.37 kW
2) 0.36 m3/h for the final receipt
11- Vacuum regulation valve (stainless steel)
12- Six All-or-Nothing brass electro-valves for the level regulation
HEATING
- Electric resistance heating
- Temperature controller
- Pt 100 in the heating tube: to control
- Stainless steel perturbation coil, supplied with network water
COLD WATER COOLING UNIT
- Connected to the water network
- For the condenser (2)
- Rotameter
- Control valve
- For the heating tube coil
- Rotameter
- Control valve
VACUUM UNIT
- Vacuum pump
- Control valve (12)
- Pressure sensor
- PID controller
- 6 Electro-valves
- The unit is used under atmospheric or reduced pressure
- The vacuum pump is connected to the vacuum network. Connection to
outside air is regulated by the control valve
SUPPLYING UNIT
- Tank containing a water/glycerine mixture. Capacity: 5 L
- Centrifugal pump (with a spare pump for maintenance), the flow rate can
be adjusted through a PC or locally.
- Frequency control
- Electric preheater
- Injection into the heating tube
SEPARATION UNIT
- In the heating tube (1), the mixture is heated by an electric resistance
- The water phase evaporates at a temperature corresponding to the
pressure in the heating tube.
4 CONTROL PANELS
Each one:
- Is composed of all the elements relating to the security and to the
protection of goods and people
- Allows control of every component in the unit, manually or individually
- Allows control of the equipment by PLC
- Includes the interfaces and the software which allow working with a PC
(not supplied)
- Condensing into the condenser, which receives cold water for the network
- Arrival in the recipient
- The electro-valves and the level detectors control every stage
- The heavy phase remains in liquid phase and leaves the heating tube by
its lateral weir, towards its receiver
RETURN TO THE TANK
- Centrifugal pump controlled by the levels in the receivers (3-4) and by
the solenoid valves
- Cooling heat exchanger
- Return to the tank (1)
INSTRUMENTS
- Temperature
Temperature sensors
- liquid - heating tube
- vapour column
- Flow rate
Rotameter
- cold water flow rate – exchanger (5)
- turbine flow meter for the supply
- Level
Detectors of:
- level in the heating tube
- level in the receiver(high-low level)
- Pressure
Pressure in the unit connected to the vacuum regulation.
AUTOMATION
Industrial programmable controller
2 All-or-Nothing digital inlets (high and low level)
8 All-or-Nothing digital outlets (6 electro-valves, 1 pump and 1 vacuum
pump)
1 digital outlet for connection to a PC
permits the regulation of the level in the final receiver
DISPOSITION OF THE UNIT
TEMPERATURE
• Control panel with synoptic
• PID temperature controller with temperature indicator
• Electric resistance: ON/OFF (only runs when the resistance is immersed)
• Perturbator: a stainless steel coil with a manual adjustment valve
PRESSURE
• Control panel with synoptic
• Piezoresistive sensor: –1/0bar
• PID temperature controller with pressure indicator
• Vacuum pump: ON/OFF
• Perturbator: manual vacuum-breaker valve
FLOW RATE
• Control panel with synoptic
• Supplying pump: ON/OFF
• Turbine flow meter: 20-200 ml/min with indicator
• Frequency variator
• PID controller with a RS232 outlet for driving the PC
• PC (not included)
• Supervision software (under Windows 2000 or XP)
• Perturbator: manual vacuum-breaker under the flow meter
LEVEL
• Control panel with synoptic
• Industrial automate
• Recirculating pump: ON/OFF
• Control of the 6 electrovalves of the centrifugal pump and the little
vacuum pump with data from high and low level sensors of the final
receipt.
• Permits the work by simulating: with synoptic and DIN plugs for the
connection.
|
|
PEDAGOGIC APPLICATIONS
• PID regulation
• Manual regulation
• On/off control
• Control of industrial components
• PC control
• Continuous process
• Study of control instruments
• Indicators – sensors – converters – transducers - controllers
|
 |
|
|
