SU1631092A1 - System of automated control ofthe procss of metering a lime suspension for successive predefecation in sugar production - Google Patents

Abstract

The invention relates to the sugar industry and can be used in the automation of juice purification processes. The purpose of the invention is to improve the quality of cleaning juices. In the system, the sensor of uncoagulated colloids is installed on the juice exiting the precursor and the pH sensor is located in the middle part of the precursor, the sensors of the pH and uncoagulated colloids at the outlet are connected from the predefecator to the dividing unit, which is connected with the memory cell, and the task to the automatic regulator regulating the position of the gates of the suspension distribution inside the predefinance is connected through the memory cell to the constant multiplication unit, which is connected via a converter to the pH sensor at the outlet of the preliming agent. As a result, the filtration index COKI I of carbonation decreases by 5-6 units, this also reduces the consumption of lime slurry by 0.03% and improves the quality of juice cleaning. 1 il. with Ј

Description

The invention relates to the sugar industry and can be used in the automation of juice purification processes.

The purpose of the invention is to improve the quality of juice cleaning.

The drawing shows a block diagram of a system for automatically controlling the process of dosing the lime slurry for progressive prediction.

The system of automatic control of the dosing of lime suspension to progressive deformation in the installation, including progressive defecter 1, gate 2 and pull 3, consisting of a control circuit for supplying lime suspension containing a series-connected sensor 4 of non-coagulated colloids with a secondary device 5, a converter 6 and an extreme - - the regulator 7, the output of which is connected to the actuator 8, installed on the limestone supply line, and the redistribution circuit to centration lime slurry within progressive defeka- torus 1 (preddefekatora) containing pH sensor 9 with the secondary device 10 mounted in the middle part preddefekatora-1 and connected to a second inverter 11, whose output is connected to the regulator torus 12 po15 yield

25

the latter is associated with the executive mechanism 13, which serves to adjust the position of the gates 2.

In addition, the system contains a pH sensor 14 with a secondary device 15 installed with a third converter 16 dividing unit 17 connected to the outputs of differentiation units 18 and 19, the inputs of which are respectively connected to the first and third converters b and 16S while the second output of the third the converter 16 is connected to the constant multiplication unit 20, the outputs of the latter and the division unit 17 are connected to the inputs of the memory cell 21, the output of which is connected to the controller 12 of the redistribution circuit of lime suspension AI has betrayed liming.

The system works as follows.

Using the sensor 4 uncoagulated colloids, the amount remaining in the solution at the output of the predeterminer of colloids is determined. The sensor 4 is connected with the secondary device 5, which is connected with the extreme regulator 75 through the converter 6, the output signal of which is fed to the actuator 8 (pneumatic actuator) of the lime lime dispenser, which both stabilizes the minimum amount of uncoagulated colloids at the output of the predeterminer by Changes in lime feed.

The operation of the lime feed control loop is based on the fact that the dependence of uncoagulated colloids on the pH value for a certain beet quality is of an extreme nature (extremum).

With an increase in pH, the number of uncoagulated colloids decreases initially, and with a further increase in pH it increases again.

Using a sensor 9 with a secondary device 10, the pH value is measured.

Pneumatic colloidal content at the exit from the right of converting differential blocks.

JQ output, proportional to non coagula

/ dL

(---) speed tl

thirty

35

40

45

pH at the output, t signals, proportional

dt

signals

doing

yut on minimal

on you

signal

Block 21 block output

those. cell 21 with the minimum coming from

If speedy call dL

pH s ie

FN

The value of the cell is 21.

In this case, the progress of the transform in block 20 is a cleverly coefficient, with 21 memories per qualifier 12.

This value is up next with the memory. The machine acts on its position to regulate lime transfers.

in the middle part of the predefecator, which is 50 prelefcator. It produces a signal proportional to the measured pH value to converter 11, where it is converted and then fed to the input of controller 12, while setting this controller to 55. gives cell 21 of memory.

The task is formed as follows.

Thus, in the middle part, it changes for what it provides for the coagulation coefficient so that

ti was equal to n

Pneumatic signals proportional to the content of uncorroborated colloids and the pH value of the juice at the output of predefec- tor 1 come from transducers 6 and 16 to differentiation units 18 and 19 of the signals.

At the output of the latter, scals are obtained that are proportional to the rate of change of uncoagulated colloids.

/ dL

(---) tl rate of change of magnitude

five

five

l

0

output pH, i.e. (-) signals proportional to

Further

dt

signals

dL dt

arrive in block 17 division

are on the minimum value

at the exit of which floor „dL

signal proportional to -r-dpH

The output of block 17 is connected to the input of a memory cell 21, which is tuned

dl / dpH & b X

those. The memory cell 21 is triggered at the minimum value of the signal received from the dividing unit 17.

If the rate of change of uncoagulated colloids depending on dL

pH s ie

Fnbyh

reaches mini

value, then the memory cell 21 is triggered.

In this case, the pneumatic signal from the output of the converter 16, multiplied in the multiplication unit 20 by a constant coefficient, is supplied through the memory cell 21 as a task to the controller 12.

This reference value is maintained until the next operation of the memory location 21. The automatic regulator 12 acts on a pneumatic actuator that changes the position of the gates 2. Shiber 2 regulates the redistribution of the concentration of lime slurry along

prelefskatora

Thus, a change in the pH of the juice in the middle part of the predefiner monitors the change in the pH of the juice at the outlet, which ensures optimal conditions for coagulation of colloids. The constant coefficient in block 20 is set so that the pH value in the middle part is equal to half the pH at the outlet.

51G

As a result of the implementation of this system, the values of the filtering juice indicator of 1 saturation are reduced by 5-6 units, i.e. the quality of juice cleaning is improved, and the consumption of lime slurry is reduced by 0.03%.

Claims (1)

Invention Formula The system of automatic control of the dosing of lime suspension to a progressive predaction in the production of sugar includes a control circuit for the supply of lime suspension containing serially connected sensor of uncooled colloids, a converter and an extreme regulator, the output of which is connected to the actuator installed on the lime supply line suspension, and a circuit for redistributing the concentration of the lime suspension inside the prediffecator, containing hic 0426 pH set in the middle part of the prediffecator and connected to the second transducer connected to the regulator, the output of which is connected to the actuator used to regulate the position of the gates, as well as the pH sensor installed at the entrance of the prediffecator and connected to 0 third converter cell memory and blocks of differentiation, division and multiplication of the signal by a constant factor, which, in order to improve the quality 5 and cleaning the juice, the dividing unit is connected to the outputs of the differentiation units, whose inputs are respectively connected to the first and third converters, the second output of the third converter is connected to the constant multiplication unit, the outputs of the last and dividing unit are connected to the inputs of the memory cell ti, the output of which is connected to the loop control loop 5 redistributing the concentration of the lime slurry inside the prediffecator. Diffusion