SU1641430A1 - Method for automatically controlling separation process in hydrocyclone - Google Patents

Abstract

The invention relates to the chemical and mining industries and is intended for the automatic control of the operation of hydrocyclones. The goal is to increase the reliability and quality of the separation. The pulp is fed through a feed nozzle into a hydrocyclone (GC) 1, where an air column (BC) is formed with reduced pressure. Air is pumped out of the sun by means of a pulse tube 3. The specific gravity is measured. The invention relates to the automatic control of the operation of hydrocyclones and can be used in concentrating plants of non-ferrous and ferrous metallurgy, as well as in the chemical and coal industries. The purpose of the invention is to increase the reliability and quality of separation. FIG. Figure 1 shows the hydraulic characteristic of the piping system; in fig. 2 - changing the position of the pipeline characteristic when the cross section (SW) of the solid in the drain and the power of HZ 1 is changed using the sensors SW 9, 10. The setting unit 13 sets the required value of the quality of work of HZ 1 defined by the value K () / di solid in the drain and power supply of Hz 1. The computing device 11 uses the signals from sensors 9, 10 to calculate the current value of K, which is fed to the controller 12 and compared with the value specified from the sensor 13. Changing the mode of operation of HZ 1 change the amount of pumped out The air pumped out from the sun is increased if the relative magnitude of the HC solid increment in the discharge and the power of HZ 1 is less than the specified one, and decreases if the relative magnitude of the HC hydrocarbon increment is greater than the specified one. The change in the amount of pumped air from the aircraft is regulated by changing the position of the locking element 5 on the pipe, the gadfly 4 according to the signal of the regulator 12 by means of the actuator 6. 4 Il. sand nozzle hydrocyclone and pulp level in the sump and their effect on the operating point of the pump; in fig. 3 scheme of unloading sand through a sand nozzle; in fig. 4 is a block diagram of a device implementing the proposed method for automatically controlling the separation process. The method is carried out as follows. The specific gravity of the solids in the discharge and feeding of the hydrocyclone is measured. The relative magnitude of the increment is determined.

Description

solid weight in the discharge and feeding of a hydrocyclone and regulate the release of sand. The regulation of sand outlet is carried out by regulating the evacuation of air from the air column of a hydrocyclone. The amount of pumped air from the air column of a hydrocyclone changes in proportion to the change in the relative value of the increment of the specific gravity of the solid in the drain and the power of the hydrocyclone until the value reaches the specified value, and the amount of pumped air is increased if the relative value of the increment of the specific weight of the solid in the discharge and the power of the hydrocyclone is less and decrease, if the relative value of the increment of the specific weight of the solid is greater than the specified one.

The method is carried out using a device, where 1 is a hydrocyclone; 2 - air column of a hydrocyclone with impulse tube 3 inserted into it; 4 - piping system; 5 - locking element with an actuator 6; 7- vacuum pump; 8 - vacuum pump drive; 9 and 10 sensors specific gravity of solid in the power and discharge, respectively; 11 - computing device; 12 - regulator; 13 - master shotgun.

The pulp is fed to the hydrocyclone 1 through a feed nozzle. In the normal classification process, an air column 2 with reduced pressure is formed in the hydrocyclone. Air is pumped out of the air column 2 through the impulse pipe 3 introduced into it through the piping system 4 by a vacuum pump 7 with a drive 8. The amount of pumped air is regulated by changing the position of the locking element 5, which is associated with the actuator 6. The locking element 5 is installed on the pipeline 4. The specific gravity of the solids in the discharge dg and the power di is monitored by specific gravity sensors 9 and 10, respectively. The setting unit 13 establishes the required for technological reasons value of the quality of the hydrocyclone operation, determined by the value

k-fe-fr

In the computing device 11, the signals coming from the sensors 9 and 10 calculate the current value of K, which is fed to the controller 12, which also receives the signal from the setting device 13 with the specified value To. The value of K is maintained at a given level.

by changing the amount of pumped air from the air column 2, which is regulated by changing the position of the locking element 5 on the pipe 4 along

the signal of the controller 12 through the actuator 6.

During operation, the pump unit and the piping system on which hydrocyclones are installed are in a certain technological connection. The head at the working point of the system is determined by the intersection of the working characteristic Q - H and the hydraulic characteristic of the pipeline Nt. Pipeline Feature

5 (FIG. 1) is determined by the following equation

Nt Ng + a02, (1)

where Q is the flow rate of the pumping unit; a is a coefficient depending on quantity

0 and the type of hydraulic local resistances 2R |, the pressure loss of which is equal to Shi; Ng - geodetic lifting height.

Thus, with the same characteristic of the pump, a change in the cross-section, the sand of the nozzle causes a change in the hydraulic resistance of the hydrocyclic. At, and, consequently, the coefficient a of equation (1), the geodetic height of the lifting height Hg is determined by the pulp level in the sump and constant at a constant level. FIG. 2 that the hydraulic characteristic of the pipeline is displaced along the axis of ordinates in accordance with the level of the pulp in

sump (curves 5h and Si); at a constant level (Hg const) and variable hydraulic resistances of the pipeline, the angle of inclination of the hydroavichlical characteristic of the pipeline changes, i and the equilibrium resistance of the pipeline 2 RI changes as the cross-section S of the sandy packing of the hydrocyclone changes. When reducing the flow area AB (Fig. 3) increases

, the hydraulic resistance of the pipeline ZRi, with increasing cross section AB 2 RI decreases. Thus, the steepness of the hydraulic characteristics of the pipeline is greater, the more

g hydraulic resistance of the pipeline 2 RI (Fig. 2). FIG. 2 shows several hydraulic characteristics of the piping system for different sections S (S 82 83) of the hydrocyclone sand fitting,

5 i.e. various hydraulic characteristics of the pipeline. When the amount of pumped air from the air column of a hydrocyclone changes, the vacuum in it changes. As the vacuum increases, the diameter of the air column increases. At a constant diameter of the sand packing AB with an increase in the diameter of the air column of the DM (see Fig. 3), the cross section (AB - DM) decreases, through which the sand is unloaded, which leads to an increase in the hydraulic resistance of the 2R pipeline. As can be seen from the f. 2, an increase in the hydraulic resistance of the pipeline leads to an increase in the steepness of the hydraulic characteristic of the pipeline Q - N. When the hydraulic resistance changes, the position of the operating point of the pump unit changes (in Fig. 2 these are points 1, 2.3} Qahda operating point (1, 2, 3) corresponds to a certain quality of the output product. As a criterion of assessment, it counts the output product of the hydrocycle /. It chooses the best price of the specific value of the relative density K of the specific weight of the solid and the discharge of the power supply

DG- & 1 - DGPrm changes the operating conditions of the equipment on the basis of the STEZ process sections H, K-zno-Zr, when the level of the pulp in the sur-grade changes, geodesic chapters change, & Ng, suppose with Hr-j P3 L, 2,. The operating point of the installation will take up nonoxei-Z. By changing the amount of air pumped out of the zycid column, it is possible to shift the working point of installation to its previous position 3 and achieve the same quality of separation in the hydrocycle.

Suppose that the system operates in the steady state corresponding to point 3 in FIG. 2, This point corresponds to the head Nz and the flow control of the pump installation Oz, the sezhesky nozzles 5h and the geodesic lift height Hrf. Let the pulp ooove in the sump increase, consequently, the geodetic lift height decreased and suppose it became equal to НГ2. The hydraulic characteristic of the pipeline lowered, the operating point of the installation was set to position 3. This point corresponds to the head Iz, the flow Oz, the cross section of the sand nozzle 5z. A decrease in the head H and an increase in the flow rate Q leads to the fact that undisclosed minerals will flow to the drain more. As a result, the value 62 will decrease, therefore, the value of K will also decrease, which will be determined in the computing device 11 by the signals of the sensors 9 and 10. At the output

the knob 12 registers a mismatch due to which the actuator 6 will slightly open the locking element 5, the amount of pumped air from the air column -2 will increase. The hydraulic resistance will increase, the head H will increase, the power consumption Q will decrease in the hydrocyclone, and there will be more small particles in the drain. Because of this, the & will increase, therefore the value of K will increase. So it will continue until the current value of K becomes equal to the specified one.

Assume that the properties of ore processors have changed in the direction of improvement,. As a consequence, the specific ches of the solid in the discharge dz will increase, and the magnitude of K will increase, since growth (Over significantly more than 5i. Increasing 5i leads to

an increase in the density of the pumped pulp, which, in turn, leads to an increase in the hydraulic resistance of the network RJ, and the system will go from point 3, for example, to point 2. At the output

of the regulator 12 in turn, the mismatch signal, according to which the actuator 6 closes the locking element 5, reducing the amount of pumped air from the air column 2 of the hydrocyclone 1.

In this case, the hydraulic resistance will decrease, the steepness of the hydraulic characteristic will decrease, the operating point of the system, slippery on the operating characteristic of the pump 0-H, will occupy position 3 (Fig. 2).

With the deterioration of the properties of the processed ore, the system works similarly in the opposite direction.

As sensors 9 and 10 of the specific gravity of the solid in the feed and discharge of the hydrocyclone, a known device can be used. As a computing device 11, setting device 13, controller 12, a microprocessor complex based on KTS LIUS2 elements from the nomenclature list of KTS LIUS-2 technical equipment can be used. To implement the proposed control method, the following technical equipment from the specified nomenclature list will be sufficient: input element DC signals KC 31.33, memory element KC54.16; microprocessor controller KS 59.04; DC output element, 32.08; keyboard is functional

square 27.47; power source for power

of the elements of the CCC LIUS-2-KS.32.08 (GSP Mikrodat).

As a vacuum pump 7, a VM-120M type pump with a capacity of 128 m3 / min is used for one or several hydrocyclone batteries 6 depending on their diameter; A gas valve of the type 30 h 17bk with a nominal passage DN m 50 mm, coupled to the actuator 6 of the MEO type, is used as the locking element 5 on the air duct 4.

Claims (1)

Claims A method for automatically controlling the separation process in a hydrocyclone, including measuring the specific gravity of the solid in the discharge and feeding the hydrocyclone, determining the relative magnitude of the increment in the specific weight of the solid in the discharge and feeding the hydrocyclone, and controlling the sand yield, 0 five In order to increase the reliability and quality of separation, the sands are controlled by regulating the pumping of air from the hydrocyclone air column, while the amount of pumped air from the hydrocyclone air column is proportional to the change in the relative increment ratio of the solid weight in the drain and feeding the hydrocyclone until the given value reaches values, and the amount of pumped air is increased if the relative increment ratio of the specific gravity in the discharge and feeding of the hydrocyclone is less than the target, and decrease, if the relative increment value of the specific weight of the solid is greater than the target. /// Q, Qt Q FIG. 2 Nutrition