SU1223997A1 - Method of automatic controlling of sedimentation centrifuge - Google Patents

Description

"

The invention relates to the automatic control of the process of separating the suspensions in precipitation centrifuges and can be used in the whole paper industry, the construction materials, the metallurgical, chemical and pharmaceutical, microbiological, food and other industries. x industries.

The purpose of the invention is to save flocculant consumption.

The drawing shows schematically an automatic control system for a centrifugal centrifuge for separating a suspension of sewage, implementing the proposed method,

The control object is a centrifugal screw 1., precipitating to separate the wastewater suspension.

The automatic control system includes automatic flow meters 2 and 3, respectively, suspensions and phpoquat, sensors 4 and 5, concentration and suspension, respectively, express analyzer 6 laboratory for measuring the sediment concentration time using paBi-Jbie, unit 7 for determining the flow of dry matter with suspension unit 8 for determining the efficiency of dry matter retention, regulator 9 for dry matter consumption with suspension; regulators 10 and 11 for flocculant consumption and concentration of centrate, respectively, setting devices 12, 3 and 4, respectively, of the set values of the dry matter flow rate, the dry matter retention efficiency and the centrifuge concentration, the deviation determination unit 15 between the set and the measured values of the dry matter retention efficiency, the ignition rate change rate unit 16 relative to the flocculation flow rate change, the mismatch determination section 17 minetal and measured values of the relative rate of change of the concentration of the centrate, preset 18. the minimum relative rate of change of the concentration of the centrate, blocks 19 and 20 of the formation of corrective actions, blocks 2, 22 and: 23 shutdowns S, block 24 of positional control, regulating devices 25 and 26.

All elements of the systems: -; control, except for automatic measurements 23997

regulators and regulators are implemented using mathematical and logical computing devices.

5 The method is carried out as follows.

The signal, ala from the automatic meter 2 and sensor 4, is fed to block 7, in which the flow of dry matter coming from the suspension into the centrifuge is determined by the formula

wasp

: f

where gj. - suspension consumption;

C | - suspension concentrations. The dry matter flow signal is then fed to the dry matter flow regulator 9 with the suspension, which forms the control signal

To control regulatory authority 25 installed on the slurry supply line. The set value of the dry matter consumption is entered using the setting device 12. The signals from the automatic meter 2, sensor 4 and express analyzer 6 are fed to the block 3 for determining the efficiency of dry matter retention by the formula

with-

: with; Gs ;; - with t

where C and Cf are concentrations, respectively, of sediment and fugate.

Next, the signal from block 8 comes

to block 15 to determine the difference between the desired and calculated values of the dry matter retention efficiency. The specified value of the effectiveness of the delay is introduced into the block 15 with the help of the unit 13.

The signal from the automatic meter 3 of the flow rate fpokul nta is supplied to the flocculator flow regulator 10, which generates a control signal for controlling the regulator 26 installed on the flocculate supply line.

Signal with. Sensor 5 of the centrate of the centrifuge is fed to the controller I1 of the concentration of the centrate, which outputs an control signal, which sets the controller 0 to the flow rate of the shock absorber. The target value of the centrifuge is introduced by setpoint 4.

Signa. The automatic flocculant flow meter 3 and the centrifugal concentration sensor 5 are fed to block 6 to determine the speed from

the change in the concentration of the fugate relative to the change in the flocculant flow rate

  JlTsl Z Jf-l ill V G,. where C-, n and G n1 are respectively the centrate of the centrate and the flow rate of flocta nta at the time of viewing

l At the same magnitude, but at time n-lj. The signal of the relative rate of change of the concentration of the fugate from the output of block 16 goes to block 17, which calculates the difference between the minimum value of the relative rate of change of the concentration of the fugate

/ iC a.

(g-- mm, setpoint adjuster

Q (j fl

18, and the calculated value of the relative velocity.

The signal of the difference between the specified and calculated values of the effectiveness of the delay 46 from the output of block 15 through the reject blocks 21 and 23 goes to the blocks 19 and 20 of determining corrective actions. In block I9, a corrective action is formed. L regulated 0

five

0

five

no consumption of dry matter with suspension according to the formula

"". "L. -E. -.

In block 20, a corrective action is generated to control the concentration of the centrate in accordance with the formula

s,., ", - s ,. These corrective actions are applied to the respective regulators 9 and 11, respectively, of the dry matter consumption with the suspension and the concentration of the centrate. The signal of the difference between the specified and calculated relative rates of change in the concentration of the centrate from the output of block 17 is fed to the position control block 24, which controls the shut-off blocks 21, 22 and 23.

If this difference is greater than a predetermined value, then the supply of a corrective action is turned off. VIA on regulator 9 and the supply of corrective actions to regulators 10 and 11 is turned on. In the opposite case, the supply of corrective actions to regulators 10 and 11 is turned off and the supply of corrective action to regulator 9 is turned on.

 I of the Criminal Code

 ) fe- "I 7.0

Fusot

Editor M. Dylyn

Compiled by V. Novikov

Tehred I.Gayl, osh Corrector A.T. sko

Order 186} / 8 Circulation 517 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 13035, Moscow, Zh-35., Raushsk nab. , ,P. 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR AUTOMATIC CONTROL OF SEDITION CENTRIFUGE, which includes measuring the flow rate of the suspension and flocculant, the concentration of the suspension and the centrate, determining the flow rate of the dry matter with the suspension, adjusting the flow rate of the dry matter with the suspension, changing the flow rate of the suspension and adjusting the flow rate of the flocculant depending on the concentration of the centrifuge I mean that, in order to save flocculant consumption, adjust the concentration of the centrate by changing the flocculant consumption, measure the end sludge filtration, determine the value of the efficiency of the detention of dry matter, the measured values of the concentration of sediment, suspension and centrate, compare with the set, determine the rate of change in the concentration of the centrate with respect to changes in flocculant flow rate and compare with its minimum value, and regulation of the flow of dry matter active with the suspension, and the concentration of the centrate is carried out with correction for the mismatch of the value of the efficiency of the retention from a given value and for the mismatch of the rate of change to the concentration of the centrate from the minimum value and the control of the flocculant flow rate are carried out with correction depending on the mismatch of the rate of change in the concentration of the centrate from the minimum value. ί