SU1286237A1 - Automatic control system for separator and settling tank - Google Patents

Abstract

The invention relates to a method for the automatic control of a separator / settler, can be used in the petrochemical industry, and allows an increase in the accuracy of separation of settled liquids. The method is implemented by the SAR, which includes a lower liquid level control loop (low level sensor 6, regulator 12, lower liquid outlet valve 13), an upper liquid level control loop (level sensor 8, computing unit 9, level regulator 10, upper liquid valve 11). liquids from separator 2) 1 sludge. about s

Description

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The invention relates to methods for the automatic control of settling separators and can be used to control the discharge of sludge fluids with different densities from the apparatus in the oil and petrochemical industries.

The purpose of the invention is to improve the accuracy of separation of sediment in liquids.

The drawing shows the implementation of the method.

The automatic control method is as follows.

A mixture consisting of gas and two liquids insoluble in each other, via pipeline 1, enters the separator-settler 2, in which the process of separation of the liquid takes place and its separation into two sedimented liquids. The separated gas is discharged through conduit 3, the upper liquid is withdrawn through conduit 4, and the lower liquid through conduit 5.

From the sensor of the lower liquid level 6, the output signal goes to the scaling unit 7, in which the signal of the level sensor 6 is brought to the scale of the signal of the level sensor 8, measuring the lower level of the upper liquid. From the output of the scaling unit 7, the signal is fed to the computing unit 9, where the lower liquid signal from the sensor 6 is subtracted from the signal of the level 8 sensor of the upper liquid. From the output of the computing unit 9, a signal equal to the difference between the signals between the sensors 8 and 6 of the levels of the upper and lower fluids, respectively, is fed to the regulator 10 of the upper liquid, where this signal is compared with the reference signal. In the event of a mismatch between the reference signal and the output signal of the computing unit 9, the controller 10 changes the flow rate of the upper fluid by moving the actuator of the control valve 11.

The level of the bottom fluid is measured by a level sensor 6 connected to the level 12 regulator of the bottom fluid. The output signal of level sensor 6 is compared with the reference signal, and in case of their mismatch, regulator 12 changes the flow rate of the lower fluid by moving the actuator of the regulating valve 13 accordingly.

Example. When raising the level of the lower

With a liquid (e.g., water) in the separator-sump, the level of the upper liquid (e.g., oil) will simultaneously increase. The calculation of the difference in the levels of the upper and lower liquids makes it possible to estimate the true volume of the upper liquid accumulated in the separator-settler and, on this basis, form a signal for a change in its pumping flow rate.

Claims (1)

Invention Formula A method for automatically controlling a separator-settler containing two sludge fluids by adjusting the flow rate of the lower fluid from the separator separator depending on its level in it, measuring the level of the upper fluid in the separator-settler and changing its flow from it, In order to improve the accuracy of separation of settled liquids, the magnitude of the difference between the levels of the upper and lower liquids is determined and, depending on the specified value, the flow rate of the upper liquid from the separator-sump is regulated. but. five