The GX-12 thickener automatic control system realizes the automatic detection and control of the main process parameters of the thickener to meet the requirements of the thickener process technical indicators.
Second, the system control program
The concentrator needs to add a certain amount of flocculating agent to the slurry to be concentrated, so that the ore particles in the slurry form flocs, accelerate the settlement, and improve the concentration efficiency of the pulp.
The automatic control system is required to continuously test the relevant process parameters; the process parameters affecting the technical indicators are stably controlled.
The concentration of the bottom discharge ore is stabilized within a given range of 40% or more to avoid production accidents such as crushing.
Control the amount of flocculant added to ensure the technical indicators of overflow water.
The dosage of the dilution water of the medicament is controlled to ensure that the flocculant is diluted to a concentration of 0.02% in the pipeline.
The balance between the ore supply and the discharged ore is ensured to ensure the stable operation of the machine. Under the premise of ensuring the two process indexes of the underflow concentration and the overflow water quality, the system can maximize the treatment capacity of the concentrator.
According to the requirements of the process for the automatic control system, the production process of the three control subsystems to the thickener is designed to realize automatic control. System configuration is shown in Figure 3.
(1) System control principle and control model
A Underflow Mineral Concentration Closed Loop Control Subsystem The control loop stabilizes the concentrator's underflow decantation concentration within a given range. Concentration control is achieved by adjusting the underflow rate.
As shown in Fig. 3, the concentration value detected by the slurry concentration meter is compared with the concentration given value, and a deviation signal is generated, and an adjustment value is generated by the PID operation, and an analog signal reflecting the adjustment amount is generated by D/A conversion. The signal controls the rotation speed of the sand pump motor to change the underflow discharge amount, so that the underflow slurry concentration is stabilized within a given value range.
In this control system, its control model function is Δu dl =f dl (e dl )
Where Δu dl — the underflow adjustment increment;
e dl ——— the deviation of the underflow concentration;
f dl ———The function of concentration deviation. The control loop adopts the positional discrete equation commonly used in PID control. [next]
B Flocculant Adding Quantity Closed Loop Control Subsystem The control loop controls the amount of flocculant added, and controls the interface height of the flocculated pulp to a given range to ensure that the overflow water index is within the acceptable range. The control ring is a stable control of the flocculation slurry interface.
The control system is a multivariable control system whose control model function is Δu jy =f gk (ι gk )+f jm (ι jm )+f dj (ι dl )
Where Δu jy ———dosing adjustment increment;
ι gk —- increase the amount of minerals;
ι jm ——— interface height deviation;
ι dl ———the amount of underflow concentration deviation;
f gk , f jm , f dj ——— a function of the three parameters of the ore amount, the interface height, and the underflow concentration.
f gk (ι gk ) is a proportional function of the increment of the ore, f jm (ι jm ) is a discrete equation of the PID operation, and f dj (ι dl ) is a discrete equation of the PD operation.
C Drug Dilution Supplementary Water Automatic Control System This control ring is a concentration of 0.2% concentration of flocculant diluted to 0.02%. The control loop is a proportional adjustment system with only one parameter, and its control model function is U xs =K xs •L jy
Where U xs ——— the amount of adjustment of the dilution of the medicament;
L jy — the amount of flocculant added;
K xs ———The proportional coefficient of dilution water.
(two) system control software
The control software of this system is divided into six parts. These six parts are the initialization of the system, the input and judgment of the system working condition and the scene environment, the processing and display of the sampling and sampling data of the system, the calculation, comparison and judgment of the deviation of each control loop of the system, and the calculation of each control equation. Processing and output.
The flow chart of the control software is shown in Figure 4.
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