The automatic control rate of Shijiazhuang refining and chemical plant has reached the advanced level

Since the start of the automatic control improvement project, Shijiazhuang Refining & Chemical Co.

Cross-professional cooperation and joint research to ensure that the project is completed on schedule

The level of automatic control rate of the instrument directly reflects the level of automation of the production device, is the basis of all advanced control, and is related to the level of production efficiency.

During the construction of the project, due to the poor feasibility of the original design and unreasonable parameters, the six cascade loops of the hydrogen production plant have not been put into use.

At the same time, the Electrical Instrument Center publishes a weekly self-control rate report every week, summarizing the analysis of the self-control rate of each device, current problems and next week's work plan, etc.

Tackling key and difficult problems drives a steady increase in the rate of self-control

"The solution of every problem is the result of everyone's collective research.

In recent years, Shilian has held monthly instrument professional technical analysis meetings to analyze the important and difficult problems that restrict the improvement of automatic control.

In view of the problem of untimely valve adjustment or excessive amplitude, the research team checked and verified the unavailability of instrument measurement and adjustment loops on the one hand, updated relevant valves or valve trims, and strengthened the maintenance of instrument control valves on the other hand.

　　In actual operation, the management personnel found that the flow rate of the continuous reformer xylene tower bottom can only control the liquid level in cascade, but cannot realize the cascade control of temperature changes.

　　Improved automatic control rate makes the device run more intelligently and smoothly

　　In the past, due to unreasonable PID parameter tuning, the 381 loops that have been put into automatic control did not work well.

　　On this basis, Shilian also established an automatic control rate and stability rate monitoring system and an alarm and operation monitoring system to realize real-time monitoring and historical tracing of the device's automatic control rate, stability rate, DCS system alarm record and operation record.

　　Today, the control stability rate of the quarrying plant has been gradually increased from 80.