SU1059270A1 - Method for controlling centrifugal compressor load - Google Patents

Description

This invention relates to the regulation of centrifugal compressors,

There is a known method for controlling the load of an electrically driven centrifugal compressor by changing the position of the throttle valve installed at the compressor inlet, according to the measured and specified value of the drive power lj ,.

However, the known method does not provide the required control accuracy of the centrifugal compressor.

The purpose of the invention is to improve the accuracy of regulation.

This goal is achieved by the fact that, according to the method of regulating the load of an electrically driven centrifugal compressor, by changing the position of the throttle valve installed at the compressor inlet, the measured gas pressure in the line in front of the throttle valve and, in the case of exceeding the measured pressure of a given value, corrects the specified power value, summing it with a value proportional to the difference of the measured and specified pressure gas, and limiting the maximum value of the total value.

The drawing shows the block diagram of the device that implements the proposed method.

The device for controlling the load of the centrifugal compressor 1 with the electric drive 2 by changing the position of the throttle valve 3 installed at the compressor inlet contains a sensor 4 and a power setting device 5, a converter 6, a load controller 7, a throttle actuator 8, a gas pressure sensor 9 line 10 before the throttle, the comparator 11, the adder 12 and the limiter 13.

The proposed method is implemented as follows.

The gas pressure in line 10 in front of the throttle valve 3 is measured by a sensor 9, the signal from which is supplied to comparator 11, where it is compared with a predetermined value. If the gas pressure in the K1 line is less than the specified value or equal to it, at the output of the comparator 11

0, a zero signal is generated, and in the event that the gas pressure is greater than a predetermined value, a signal is generated at the output of the comparator that is proportional to the difference between the measured and the given gas pressure. The received signal is fed to the input of the adder 12, to another input of which a signal comes from the setting device 5. The total signal is fed to the regulator 7 through the limiter 13, which prevents the compressor from overloading at large values of the total signal. To another input of the controller 7, which can be used as a regulator PRZ. 21, a 4 is supplied} without a converter 6 (for example, type EPP), which converts an electrical signal into a pneumatic signal from the sensor 4 of the power of the electric drive 2. At the output

0 of the controller 7, depending on the difference of the input signals, a control signal is generated, which is fed to the actuator 8 of the throttle valve 3 and changes the load on the compressor 1

5 by pressure sensor and power sensor signals.

Thus, an additional measurement of the gas pressure in the line in front of the throttle valve (1 and

The Q adjustment of the setpoint power value by the difference of the measured and set gas pressures makes it possible to increase the control accuracy by correcting the load reference with increasing pressure

in front of the throttle.

Claims (1)

METHOD OF LOADING THE LOAD OF A CENTRIFUGAL COMPRESSOR with an electric drive by changing the position of the throttle valve installed at the compressor inlet according to the measured and set values of the electric drive power, which is characterized by the fact that, in order to increase the accuracy of regulation, the gas pressure in the line in front of the throttle valve is additionally measured and, if the measured pressure exceeds a predetermined value, the set value of the power is corrected by summing it with a value proportional to the difference between the measured and preset gas pressure, and limiting the maximum value of the total value. 0226901