Introduction to instrumentation professional control algorithms in the application of the aromatics unit

Introduction to instrumentation professional control algorithms in the application of the aromatics unit 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

abstract: the aromatic combination plant xylene adsorption separation unit automatic control system for rotary valve working condition, parameter adjustment. Combination of urumqi petrochemical company refinery capacity of one million tons of case analysis, summarizes this kind of control arithmetic in some of the problems appeared in the process of application and the relevant solutions. 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

1, the preface 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

control arithmetic ( Regional switch control ZTC) For aromatics adsorption separation plant, is a kind of specific & other; Control algorithm & throughout; , the technology of uop ( Global oil companies in the United States) parex（ Adsorption separation) Adsorption chamber device control system ( accs） The core part, it mainly controls the adsorption chamber pumped loop and pressure loop, increase the stability of partition conversion process, etc. 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

2, process principle 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

xylene adsorption separation plant process using uop adsorption separation, adsorption tower using simulated moving bed adsorption process principle. 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

3, the control principle of 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

ZTC is sorbex class specialized processing equipment control algorithm, the regional transformation, the control arithmetic is used to control the adsorption chamber part of pump and valve delivery cycle. Principle is to use control system to record cycle in a particular area of the magnetic flap thermometer, ZTC algorithm used to record before the opening of the open valve. Magnetic flap suspension pid control through eight dv thermometer thermometer | | glass tube floating ball | | glass thermometer thermometer two-color thermometer

, control valve opening. Through calculation, in a short period of time to adjust the valve opening & other A shower & throughout; State, and finally use a period to record the opening open the valve. Use this method to control the opening of circulating valve, the flow of the transformation of the region from the typical 30 - Reduce to 1 to 40 s 3s。 Proved, the regional transformation of the shorter the time, the higher yield. 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

4, case analysis, 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

according to the control arithmetic and we improve the device parameter adjustment when load and the daily maintenance experience, combined with the plant 1 million tons/year of xylene adsorption separation device in the aromatic combination plant rotary valve system, the actual case of the fair sex, the operation of floating ball thermometer control is used in all kinds of situation summed up as follows: 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

in June 2011 large aromatic plant shutdown overhaul, the overhaul for repair of this valve, device maintenance, starts after the end of the rotary valve system starts running normally, but no. 1 adsorption chamber pressure slightly bigger than a shutdown money movements, especially in delivery control from 4 to 1 area particularly when converting pressure fluctuations. So wanted to send to pressure control ZTC parameter tuning fine-tuning, to eliminate pressure fluctuation, the same area after adjusting the next cycle transformation pressure fluctuation has been effectively controlled. 8 dv magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer