Automation and visualization (SCADA) of lacquer manufacture process (A/S Biolar)

Used controller: based on Basic Tiger (Wilke Technology GmbH) .

Used visualization program: based on Delphi .

chemistry 02 1

This application concerns lacquer and colours manufacture process. One of the most important parts of lacquer manufacture is alcid resin. The synthesis of the resins is to be provided by precise regulation of temperature with different parameters on different periods of time.

This automatized system provides:

  1. Control of oil tanks' temperature;
  2. Control of the both reactors' temperatures according to the applied technological diagram;
  3. Computerized control and generating the reports of the process.

Controller of the process is disposed in the power control box where executing mechanisms and sensors are attached.

The following functions are proceed from one of the process controller:

  1. Temperature control of the oil tank;
  2. Control of the both reactors' temperatures according to the applied technological diagram.

The following functions can be executed from the control desk:

  1. Switching on all of executing mechanisms (tank heater with 12 sections, both reactors' valves, both reactors' electromagnetic valves) in automatic and manual mode.
  2. Setting of the following controlled parameters:
    1. Tank temperature
    2. Temperature of the 1st reactor t1Amax and t2Amax
    3. Temperature of the 2nd reactor t1Bmax and t2Bmax
    4. Temperature difference between the 1st reactor and cover Dt1A and Dt2A
    5. Temperature difference between the 2nd reactor and cover Dt1B and Dt2B
    6. Emergency temperature of the 1st reactor t1AV
    7. Emergency temperature of the 2nd reactor t2AV
    8. Interval of the time duration L1A , L2A, L1B and L2B setting
  3. Reflection of the process conditions.

Reflection of the process condition shows how many sections are switched on in the tank, which stage is the process on in each reactor, tank and reactor temperature, temperature difference between reactor and cover. The conditions of the process are defined with the stretches of temperature-time dependences.

Controller works this way:

It is possible to change the selections in the window using cursor buttons. An asteriks will appear near the chosen option. To confirm the selection, press ENTER. To exit from the window, press Esc. Change options using vertical buttons, change numbers using horizontal buttons (Set parameters, set quantity of sections in a tank) and on/off conditions.

It can go from the main window to the following help-windows:

  1. Setting the parameters
  2. Selection of the process
  3. Reflection of the process conditions

It is possible to start different controlling stages (in the window " Selection of the process"):

  1. Only heating of the tank
  2. Tank + 1st reactor
  3. Tank + 2nd reactor
  4. Tank + 1st and 2nd reactors

Temperature control of the tank is based on consecutive encreasing/decreasing of swithed on sections quantity according to PI algorithm ( the parameters of the algorithm are disclosed during experimental using of the equipment ).

The 1st and the 2nd reactors processes are analogous, that is why the pult service functions are described only for one reactor. Missing a process from selection discovered electromagnetic valve varsts and the valve was opened during pouring the oil into it. During the heating valve condition does not change. The electromagnetic valve opens/closes according to PID algorithm, so that it is being filled around with oil or cancelling solution.

When temperature reaches t 2MAX , according to the set-up time (L1A , L2A ), the temperature get fixed. If the time has been missed, the air and sound signals of the 1st level works, that means, that cancelation must be done in manual mode. If during definite time ( the time is chosen using system parameters) the valve does not shift to the cancelation mode, than emergency signal starts and the system automatic shifts to another control mode, to set tank temperature 140°C to 160°C . The sound signal works to notify that csilol is to be given. After that operator shifts the valve to heating mode and proceeds to 5. The process finishes automatic. When the 5 th process is finished the sound singnal works. If operator does not react in time, the emergency singnal follows.

If the maximum temperature limits are exceeded, the emergency singnal follows. The sound signal can be switched off from the control deck if needed.

Controller has serial connection to PC (Rs 232 or RS 485), and "DATE CENTRE" programme provides observation, archivation and recording of each process.

In this process temperature is given by Pt100, with precise temperature measure merisanas of ±0.75 %. The temperture of the reactor is measured between the mixing tool and wall, the cover temperature apvalka temperatura is measured on the spot inside the termocontrol solution pipe. The termometers for each reactor were found to provide maximum precision of temperature differences. Using these termometers we can define temperature changes with precision of ±0.2°C .( if the difference does not exceed 5°C ).


You are here Application examples Chemical technology Automation and visualization (SCADA) of lacquer manufacture process