Application of AI Instrument in Three-effect Concentrated Evaporation Control System of Pharmaceutical Factory

2020-08-06 14:19:20

Keywords: bus control manual self-tuning concentrated evaporator
I. Overview:

There is a key process control for the concentration treatment of liquid materials in the pharmaceutical, glucose, starch, food, chemical and other industries. Constant vacuum, precise temperature control, the entire process must be monitored and controlled, and in the case of abnormal conditions, an alarm is issued.
The process of satisfying continuous feeding and continuous discharging requires the liquid to stay in the evaporator as short as possible under the highest vacuum and bottom boiling temperature as possible, satisfying the heat sensitive material concentration and keeping the liquid quality constant and avoiding the product. Destructive process requirements.
Yudian has developed an automatic control system.

Second, the system requirements:

1. Set up a bus type computer monitoring system. Save on-site wiring.
2. 100% functional operation of the instrument on the host computer, real-time reading of measured values, setpoint, automatic/manual bumpless switching, adjustment of manual output value, and switching input/output operation function, good for industrial field temperature , pressure, flow, level measurement and control.
3. The flow chart has animation, query real-time record, historical data, alarm record, print, data post-processing analysis function.

Third, Yudian plan:
1. Establish AIFCS fieldbus computer monitoring system. All parameters are transmitted remotely to the control room computer via RS485 twisted pair. Achieve two-way monitoring. The communication distance is up to 1200 meters.
2. The instrument chassis and the distributed wall are installed in the industrial site. The high-performance AI-808AXL2L2S4 series artificial intelligence regulator, AI-708HAI4XS4 flow totalizer, AI-704MAJ0J0J4S six-way display alarm instrument are installed in the box, and the measuring point position is shown in three. Scheme of the evaporator process. Complete the collection of industrial field data and control the operation of the equipment.
3. The upper computer software is made up of the secondary control software AIFCS, which can be used directly by the user. The configuration software adopts the lower-level machine and the upper-level machine two-layer structure system, and all control information and data information are managed and distributed on the upper computer. All the instruments connected to the industrial site are monitored, data collected and processed on the host computer.
4, using ordinary commercial computers, display 19-inch, WINDOWS operating system.
Fourth, system operation:
In the industrial site, the temperature, pressure, flow and liquid level data can be directly displayed. The AI808 regulator can be switched directly/automatically. The manual output value can be adjusted to directly adjust the opening of the pneumatic control valve. Make it complete the process requirements.
Control instructions:
1. Feed adjustment: FI is the flow transmitter. It is not processed in the flow totalizer AI708H. It shows the instantaneous flow, cumulative flow, and the output is proportional to the flow rate of 4-20mA current signal, to FC ammonium sulfate. Feed regulator AI 808.
Select AI-708HAI4S4X with module I4 current input, X current transmission, S4 communication module.
Flow totalizer parameters.
Note: The parameter list can be modified according to the actual process requirements.
According to the flow transmission signal 4~20mA input regulator and the given value for PID operation, output 4-20mA control current to control the pneumatic valve PCV1.
The AI-808A2XS4 is equipped with a light column to display the A2 module, X current output, and S4 communication module.
Regulator parameters
     Manual auto-tuning: Position adjustment is used due to auto-tuning execution. The actuator used in this system is a regulating valve, and the output does not allow large fluctuations, so manual self-tuning is adopted.
*Step: Press manual / automatic switch A / M key to cut manually
Step 2: First adjust the valve manually. After the manual adjustment is basically stable, start the auto-tuning in the manual state. Press the A/M button for 2 seconds to display “At”. At this time, the instrument output value is limited to the current one. The manual value is ±10% range, not the range defined by OPL and OPH, thus avoiding the phenomenon that the valve is not allowed to change greatly at the production site. After 2 to 3 oscillations, the display stops flashing “At”. At this time, the self-tuning parameters M5, P, and t automatically calculate the control parameters.
In addition, when the controlled physical quantity reacts quickly, the manual self-tuning method can obtain a more accurate self-tuning effect.
After the auto-tuning is finished, it can be put into automatic operation.
2. Efficient evaporation temperature adjustment: T11 is the temperature transmitter and temperature regulator AI808 regulator according to the given value for PID operation and output 4-20mA control current to control the pneumatic valve PCV2. The sensor is powered by the meter 24VDC. The self-tuning method is the same as above.
3, temperature, pressure measurement, for the two-way PT100 and two-way pressure transmitter 4-20mA current signal, for data display, upper and lower limit alarm processing, the sensor is powered by the instrument 24VDC.
Select AI-706MJ0J0J5L2L2S four-way display alarm device. With two J0 module three-wire RTD input, one J5 two-way current input contains 24V power supply.
Four-way display alarm parameter
4, alarm function: one way room temperature display is used to set the lower limit alarm output 12V voltage for alarm interlock use, through each alarm output L2 relay contact buzzer sound alarm instrument panel panel add alarm sound release button switch , put in operation. And has a computer sound card alarm function.
5, sampling time: the report on the computer forms the sampling time once an hour, 24 times a day. The report has the instantaneous flow value of the feed, the accumulated value per hour, the accumulated value of 8 hours per shift, the total accumulated value of the accumulated value of 24 hours per day, and various temperature and pressure data.
All data is upgraded to a table, one per day, and after 31 days of storage, it is moved forward one day, disappearing the data of the previous day.
V. System operation and user evaluation:
1. Stable and reliable real-time full-range monitoring; automatic adjustment; automatic inspection; automatic fault alarm; automatic record reporting.
2. Yudian's products are excellent in matching and anti-interference, and can detect the operation of key equipment from time to time.
3. The system increases productivity and saves a lot of money. Since the launch of the system, it has been applied in more than a dozen pharmaceutical factories nationwide, and has achieved good economic and social benefits for users.

Fried Series

Rushan Jinguo Food Co., Ltd , https://www.jinguofood.cn