SU1456239A1 - Method of determining consumption of pulp when supplying hydrocyclone - Google Patents

Abstract

The invention relates to the automatic control and management of the work of hydrocyclones and can be used at the beneficiation plants in the processing of ores in ferrous and nonferrous metallurgy. The use of the method improves the accuracy of the invention. The invention relates to methods for determining the operation of hydrocyclones and can be used at the beneficiation plants of ferrous and nonferrous metallurgy. The aim of the invention is to improve the accuracy of control of pulp flow. FIG. Figure 1 shows the movement of the operating point of a pumping unit when the level of the pulp in the sump and the speed of the pump impeller are changed and their control of the pulp flow in the hydrocyclone supply is measured. The method is used to determine the pulp consumption in the hydrocyclone feed according to the parameters of the power consumed by the pump, the speed of the impeller and the pressure of the pulp at the inlet to the hydrocyclone. For this, the speed of the impeller is changed by a certain amount dp and stabilizes the pulp level in the sump. After that, the pulp flow is determined by the formula Q, -, K; (N; / P, - - - K +, / P; 4-,) n, -, / Dn, where K; - coefficient of proportionality; N; i N ;, is the power consumed by the pump, respectively, before and after changing the speed of its impeller; P ;, is the pressure of the pulp at the inlet to the hydrocyclone, respectively, before and after changing the speed of the pump impeller; n; -, the speed of the impeller after its change; An is the magnitude of the change in pump impeller speed. 2 Il. 2 $ (L effect on efficiency; Fig. 2 is a schematic diagram of an automatic control system implementing the remote method. The method is implemented as follows. The pulp from sump 1 (Fig. -2) is pumped over by pump 2 with drive 3 into a hydrocyclone 4. Signals from power sensor 6, speed sensor 7 of impeller of pump 2, sensor 8 4ib SP a to OS with

Description

the pulp level in the sump - 1, installed on the pressure pipe 9 of the pulp pressure sensor 10 at the inlet to the hydrocyclone 4, which is stored in its memory. Computing device 5 according to the program generates a signal to the thyristor converter 11 to change the speed n of rotation of the impeller of pump 2 by a value-Dp. The value in is determined from the allowable range of speed change and should not significantly affect the process flow.

After that, the computing device 5 issues a signal to stabilize the level in the sump 1. By a signal from the computing device 5, the actuator 12 changes the position of the regulator 13 for supplying water to the sump 1. After that, the pulp level in the sump 1 is restored to the value preceding impeller of pump 2; New values of power consumed by drive 3; pressure and speed modified by sensors 6, 10 and 7 are fed to computing device 5, where slurry consumption is calculated iklon on form

K (

 pN, - ...

R-;)

n; +, yp

where K;

N-, N.

.

coefficient of proportionality;

the power consumed by the pump, respectively, before and after the change in the speed of its impeller, the pressure of the pulp at the inlet to the hydro cyclone, respectively, before and after the change in the speed of the impeller of the pump;

speed of the pump impeller after its change, the magnitude of the change in the pump impeller speed Suppose that the speed of the impeller is increased by Dp. Increasing the speed will entail an increase in the flow rate of the pump unit by AQ f (Qn), and this in turn will result in a decrease in pulp level sump 1, Computing device 3 issues a signal to increase the flow of water in sump 1 Actuator 12 changes

dp

5 0 5 o

0

five

five

the position of the regulator 13 for supplying water to the sump 1 in the direction of increasing the flow rate to restore the level of the pulp preceding the change in speed. When restoring the level in the computing device 5, the pulp consumption is calculated by the formula from the signals of the corresponding sensors 6.7 and 10,

At the next measurement of the pulp flow rate, the step for changing the magnitude of the velocity is carried out in the opposite direction and the system works in the same way as described.

As can be seen from FIG. 1, when the speed changes by the value of yp, the pump's operating characteristic QH moves to a new position (curves q and), while the Efficiency will remain unchanged if the pulp level in the sump has not changed (see points A and B in FIG. 1).

Claims (1)

Invention Formula The method of determining the pulp flow rate in the feed of the hydro-cyclone by measuring the rotational speed of the pump impeller located on the pulp supply line from the sump to the hydrocyclone, characterized in that, in order to improve the control accuracy, the power consumed by the pump drive and the pressure of the pulp are also measured entering the hydrocycdone, changes the speed of rotation of the impeller by a certain amount, regulates the level of pulp in the sump to the value preceding the change in the speed of rotation of the impeller, and the flow rate The levels in the hydrocyclone feed are determined by the formula Q 1 + 1  TO, fN; N, - ,,, mouth: P 1 + 1 yp where K; N :, N and coefficient of proportionality; the power consumed by the pump, respectively, before and after changing the speed of its impeller; the pressure of the pulp at the inlet to the hydrocyclone, respectively, before and after changing the speed of the impeller; 51456239 ., - the speed of the impeller after its change; Dp - the magnitude of the change in the speed of the impeller. nl l 1 A // - l / g; L1L Lumla Q-H Phie.-f 13yf1f f Have FIG. 2