SU1275389A1 - Device for controlling level in gas separating column - Google Patents

Abstract

The invention relates to the field of level control in a gas separation column and may be used in refining, petrochemical, chemical and other industrial areas to control distillation and stripping columns of gas separation plants. The purpose of the invention is to expand the field of application by allowing level control in various types of gas separation columns. For this, the device for adjusting the level in the gas separation column contains a level 2 sensor and a pipe 3 on which the control valve 4 is connected, connected to the output of the level 5 regulator, as well as the deadband adjuster 6, the smaller signal selector 7 i , setpoint 9 scale factor (L and two adders 10 and 11. 1 ill. yu SP oo 00

Description

"one

The invention relates to the regulation of U13OVNYA in the gas separation column and can be applied in the refinery; , keftekhim of chemical, chemical and other sectors of industry for controlling distillation and otparny columns of gas separation plants

The purpose of the invention is to expand the field of application of the device by providing the ability to control the level in different types of gas.

separation columns.

The drawing shows a block diagram of the device.

A device for adjusting the level in the gas separation column of the sovers-iT distillation column 1 (control object or another column, for example, a stripping column) with a level 2 sensor and pipeline 3 discharging the finished target product, on which the control valve 45 is connected with the regulator output 5 level tori as well as the setting device 6 insensitive bone zone, the selector 7 of the smaller signal setting unit 8 level, the setting unit 9 of the scale factor and two adders 10 and According to the level 2 sensor connected to the summation unit Adders 10 and 11. The level adjuster 8 is connected to the first input of the level 5 regulator and the subtractive input of the adder 10, the deadband setting device 6 is connected to the first input of the smaller selector 7, the second input of which is connected to you of the adder 10, and the output is from subtractive input of the adder 11, the output of the adder 11 is connected to the second input of the level 5 controller and the input of the setpoint generator 9 of the scale factor, the output of which is connected to the second summators of the adders 10 and 11.

The device works in the following way.

The output signal Fg of the sensor 2 level corresponding to the value of the adjustable parameter of the distillation column 1 is fed to the summing inputs of the adders 10 and 11. The second summing inputs of these adders receive a signal KFfi from the setpoint 9 of the scale factor proportional to the signal F, from the cyi-smator 11, where K coefficient of proportionality, defined using the unit 9 scale factor. The subtracting input of the adder 10 receives the signal Fg from the output of the setpoint 8 level. At the output of the adder 10. the signal is E, ,, -Fg, This signal is fed to the input of the selector

7 smaller signal to another input which receives a signal from the unit 6 dead zone.

As long as 5, the sum of the signals F ,,, is less than the signal F, the output signal F, jj of the adder 10 is zero and the EU signal F of the smaller signal selector 7 is also zero. Therefore, the output signal of the adder 11

is equal to F, F + KF or F ,, F,,

those. proportional to signal F. In this case, the level 5 regulator performs the rectilinear portion of the characteristic of the level change from zero to the dead zone.

When the output signal of the adder. A 10 is greater than zero, but less than the signal from the output of the unit 6 of the deadband, the output signal of the selector 7 is less than the signal is F.,. F Fg. Then off

the signal of the adder 11 is equal to F Fg, and the level 5 controller processes the deadband.

When the values of B1 | 1 input signal of the adder 10 is greater than the output signal of the setting device 6, the bone nonsensitive zone, the output signal of the selector 7 of the smaller signal is equal to F., Fg. Therefore, the output signal of the adder 11 pa0F -F,

F veins ,,,, .- F, or F ,, -Я.-.

In this case, the level 5 regulator processes the rectilinear portion of the characteristic of changing the level above the dead zone.

Thus, with a decrease (increase) in the signal Fg compared with the value corresponding to a given level, p € .gulatory level 5

0 reduces (increases) the consumption of the bottom liquid through the control valve until it enters the dead zone, i.e. until the liquid level of the rectification

S column 1 will not be equal to the specified.

The device is made on universal standard elements of industrial automation of the Start system. 3 The proposed device has a wider area of application, since it provides for regulation in different types of gas separation clones due to the possibility of changing the dead zone and the scaling factor. In addition, a more optimal adjustment of the controller allows to increase the recovery rate of the target product, as well as stabilize the operating mode of subsequent equipment. Formula of invention The device for regulating the level in the gas separation column, which contains a level sensor and a control valve installed in the discharge pipe of the target product, also a level regulator connected to the output with a regulating valve, a level indicator connected to the output to the first input of the regulator 9 N, the dead zone setpoint adjuster and the first adder connected by the first input to the output of the level sensor, and the output to the second input of the level regulator, characterized in that, in order to extend the area No device by allowing level control in different types of gas separation columns, a second adder was inserted into it, connected with the first input to the output of the level sensor, and a second input to the output of the level adjuster, lower signal selector, the first ifbToporo input connected to the output of the zone adjuster insensitivity, the second input is with the output of the second adder, and the output is with the second input of the first adder, and the scale factor adjuster connected by the input to the output of the first adder, and the output to the third inputs of the first and second adders,

Claims (1)

Claim A device for regulating the level of 15 nya in a gas separation column, comprising a level sensor and a control valve installed on the drain pipe of the target product, as well as a level controller connected to the control valve by an output 20, a level meter connected to the first input of the level controller, a meter dead zones and the first adder connected by the first input to the output of the level sensor, and the output to the second input of the level controller, characterized in that, in order to expand the scope of the device We provide the ability to control the level in different types of gas separation columns, a second adder is introduced into it, connected by the first input to the output of the level sensor, and by the second input to the output of the level switch, a smaller signal selector, the first input of which is connected to the output of the dead band adjuster, the second input - with the output of the second adder, and the output with the second input of the first adder, and a scale factor adjuster connected to the output of the first adder, and the output to the third inputs of the first and second adder s.