SU874099A1 - Method of automatic control of settler operation - Google Patents

Description

(54) METHOD OF AUTOMATIC CONTROL. The invention relates to methods for automatic control of the process of separation of pulps, thickening of helmets and can be used in chemical ore dressing and other industrial fields. A method is known for automatically controlling the operation of the sump by controlling the consumption of a condensed product and feeding coagula. nta depending on the height of the zone of constrained compaction fi The disadvantage of the known method is that it cannot provide a predetermined density of the loadable cry This product is due to the inertia of the object itself for regulating the settling tank, which has a long time constant, and leads to the fact that the required density of implanted condensed product is established over a considerable period of time. : There is also known a method for automatically controlling the operation of a settling tank by adjusting the flow rate of a condensed product impregnated by an OPERATING TANK, depending on the concentration of solids in it, with a correction for the weight flow of solids in the original slurry 2. However, this method does not provide a stable density of the discharged condensed product. The closest to the proposed invention in terms of its technical essence and the achieved result is a method for automatically controlling the operation of the settling tank by adjusting the flow rate of the schlama extracted from it, depending on its density and the load of the settling tank f 3. However, in a known technical solution, the regulator of the sludge removal does not move in steps, but continuously depending on the rate of change in the density of the sludge, which reduces the speed of the control system and makes possible loss of the slurry liquid phase. The purpose of the invention is to reduce the loss of liquid phase with sludge due to the improvement of the speed of the automatic control system. This goal is achieved by the fact that the sludge consumption is adjusted for the rate of change of its density and when the rate of change of the density of the sludge reaches the specified maximum value, its consumption is abruptly measured. The drawing shows a printable diagram of the system for automatic control of the operation of the sump, which implements the offer. method The method is carried out as follows. To one of the inputs of logic device 1, either the output signal of converter 2, proportional to the density of the condensed product discharged from the sump 3, measured by sensor 4, or the program signal generated by the program multi device 5, is supplied. Converter 2 is also connected through device 6 the control and the controller 7 to the command input of the logic device 1, and the third input of the input signal from the software device 8, the output signal of the logic device 1 is fed to the input of the controller 9, the connected W ith with the regulator Yu of the condensed product selection and the sensor 11, the condensed product consumption from the sump 3, 1 when the density of the unloaded 33 sump 3 of the condensed product increases, a signal proportional to the velocity of its density is fed to the puller 7, the output signal of which is discrete in nature for the input of the lotus device 1, C ZYKHODO1 logical device 1 to the regulator 9 serves as the output signal of the converter 2, or the program signal from the software device 5, and the output signal torus 9 enters the secondary mechanism and the organ 1O, which will increase the consumption of the condensed product [1] and thereby bring its efficiency to a given en tion. For the purpose of snagging the loss of phase with a thickened product, a decrease in density, the output signal of the device Deffun1-11 of your output goes to regulator 7 and when / 1ost 9 (by means of this, a signal of a given value using logical device 1 jumps to the input of regulator 9 with another program the frame signal generated by the program; 8. device 8. The output signal of the regulator 9 is changed so that the selection of the condensed product; ha reduced to the minimum set value or completely stopped. As a function of the load, or equal to a given constant value, during the operation of the settling tanks, a collapse of the condensed product is observed with the formation of a funnel into which the liquid phase rushes. In this case, the density of the condensed product decreases sharply, resulting in a significant loss of the liquid phase. adjustment, in accordance with which, when the rate of change in the density of the slime reaches a given maximum value, the consumption of the condensed product is abruptly changed, for example, reduced to mi imalnogo values (or completely stopped via Regulator) allows the control system to increase the speed and reduce the loss fidkoy phase to a minimum or completely eliminate them. This is achieved due to the fact that the regulator remains in the same position until the moment when the condensed product slips away, does not eliminate the funnel formed and the density value does not again meet the technological requirements. Thus, the introduction of non-linear elements into the system, which provide for the relay mode of the regulator, improves the control performance of the linear system and accelerates the transient processes in the system. The method allows to significantly reduce the time during which selection of a condensed product with a lower density against a predetermined one takes place, or to completely eliminate the selection of such a product, which will correspondingly reduce the loss of long-lived phase with the condensed product. A method for automatically controlling the operation of a settling tank by adjusting the flow rate of the sludge discharged from it, depending on its density and the load of the settling tank, differing

In order to reduce the loss of vein of the phase with sludge by increasing the speed of the automatic control system, the sludge flow is adjusted for the rate of change in its density and when the rate of change in the density of the sludge reaches a predetermined maximum value, its consumption is abruptly changed.

Sources of information taken into account in the examination

1. USSR author's certificate number 409722, cl. B O1 B 21/02, 1972.

2. USSR author's certificate number 55O164, cl. In OlD 21/00, 1975.

3. Copyright witness of the USSR № 697143, cl. In the Olt 21/00, 1977.

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Claims (1)

Claim Automatic control method 55 for the operation of the sump by controlling the flow rate of the sludge discharged from it depending on its density and load of the sump, characterized in that, in order to reduce the loss of the liquid phase with the sludge by increasing the speed of the automatic control system, the sludge flow rate is adjusted according to its rate of change density and when the rate of change in the density of the sludge reaches a predetermined maximum value, its flow rate changes stepwise.