SU1101486A1 - Method of automatic control of classifying hydraulic breaking-up device - Google Patents

Abstract

THE METHOD OF AUTOMATIC CONTROL OF A SORTING PIPELINE BY REGULATING BY REGULATING THE EXPANSION OF LIGHT AND HEAVY DRAINS, THAT AND THE -. In order to control efficiency, the pressure difference between the inlet of the fibrous suspension and the output of the purified suspension behind the sieve is measured, the concentration of the fibrous suspension at the inlet is measured and the output of the light waste is controlled depending on the measured values.

Description

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ABOUT)

FIELD OF THE INVENTION The invention relates to pulp and paper production and can be used for automatic control of a sorting pulper.

A known method of automatically controlling a sorting dipper by regulating the release of light and heavy waste 1.

The disadvantage of this method is low control efficiency.

The purpose of the invention is to increase management efficiency.

This goal is achieved by the method of automatic control of the sorting pulper by adjusting the light and heavy waste, measuring the pressure difference between the fibrous suspension inlet and the purified suspension output behind the sieve, measuring the concentration of the fibrous suspension at the inlet and adjusting the weight of the light waste depending from measured values.

The drawing shows a diagram of the automatic control systems of the sorting pulper implementing the proposed method.

The scheme contains a control object — a sorting separator with a housing 1, a rotor 2, a sieve 3, an electric drive 4 of the rotor, and a lock chamber 5 for diluting heavy waste. The automatic control system has a sensor 6 of the difference between the input of the fiber suspension and the output of the purified suspension behind the sieve, the sensor 7 of the concentration of fiber suspension at the entrance with pneumatic output, {Regulator 8 with proportional-integral control law with local setting, adder 9, positioner 10 with a customizable return area and built-in knob, gate valves 11-13 with pneumatic actuator and command electropneumatic device 14.

- The method is carried out as follows.

The pressure difference between the inlet of the fibrous suspension and the output of the prepared suspension behind the sieve, measured by sensor 6, is converted to pneumatically. A sitnal is fed to the npcKiTfMhinx locus of plibraic operations 9. A pneumatic signal from a concentration sensor at the input of the fibrous suspension enters the regulating unit 8, operating here in the mode of generating a correction signal according to the proportional law, which also enters the block 9. At the output of unit 9, the sum of these signals proportional to the corrected difference in pressure.

With an increase in concentration relative to a given correction signal at the output of block 8, it decreases and, accordingly, with a decrease in concentration, it increases. In this case, the signal at the output of block 9 also decreases or increases at a constant pressure difference.

This correction is entered into the system.

0 in order to compensate for the change in pressure difference with a change in the concentration of the fiber suspension on the inlet of a constant amount of light waste. By increasing

5, the concentration of the suspension at the inlet increases the hydraulic resistance as it passes through the sieve and the pressure difference increases. The signal from the output of block 9 is received

0 to a unit 10 that controls a gate valve 11 with a pneumatic actuator installed at the exit of the light waste. The accumulation of light soils (wastes) in the tank of the sorting pulper makes it difficult for the cleaned fiber suspension to be drained from the tank through the sieve, since soils in the sieve area increase the resistance to the passage of the suspension. As a result, the pressure difference between the zones before and after the sieve increases, i.e. between the entrance of the crude fiber suspension and the exit of the purified suspension.

5 When the pressure difference of the upper limit of the zone of permissible values is exceeded, the block 10 outputs a maximum pneumatic control signal of 0.1 MPa, which leads to the full opening of the valve 11 and the release of light waste from the tank of the sorting pulper. With a decrease in the pressure difference from the upper limit to the lower boundary of the zone of allowable values, the signal at the output 10 remains equal to 0.1 MPa and the damper 11 remains open, which ensures the complete release of fine waste.

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With a further decrease in the pressure difference below the lower zone of allowable values, the signal at the output of block 10 becomes equal to 0.02 MPa, which leads to the complete closure of the valve 11 and the termination of the light waste introduction. The upper and lower bounds of the zone of permissible values of the pressure difference are determined experimentally.

in the industrial diffuser. The electro-pneumatic control device 14 controls the closure 5 and the opening of the barrier 12 and 13 in the heavy waste pipeline in a predetermined rigid program.

Thus, the use of the proposed method allows to increase the control efficiency.

Claims (1)

METHOD FOR AUTOMATIC CONTROL OF SORTING HYDROPAPER by regulating the release of light and heavy waste, about t and -. characterized in that, in order to increase control efficiency, the pressure difference between the inlet of the fiber suspension and the outlet of the purified suspension behind the sieve is measured, the concentration of the fiber suspension in the inlet is measured and the release of light waste is controlled depending on the measured values. 98GPGP ^t_ P ^ 1,110