Method for determining technical condition of centrifugal compressor of gas pumping unit

Abstract

FIELD: automated process control systems.SUBSTANCE: invention intended for monitoring and diagnosing the technical condition of centrifugal compressors (CC) with electromagnetic bearings as part of gas pumping units (GPU). The method consists of continuous monitoring of the rotor system parameters: axial shift, vibration displacement range, axial force of the electromagnet and currents in its windings, taking into account the current technological mode of the GPU (Ring, Main Line and their combinations). When any parameter exceeds warning or emergency limits, the system automatically generates a "Dangerous CC Condition" signal, notifies the operator via the automated workstation, and logs the event in the dispatch control archives.EFFECT: increasing the reliability of gas pumping units (GPU) operation by automating the detection of hazardous conditions, promptly informing personnel, and ensuring reliable recording of emergency events in the monitoring system.1 cl, 1 dwg

Description

[0001] The invention relates to the field of automated process control systems and can be used for comprehensive monitoring and diagnostics of the technical condition of a centrifugal compressor (hereinafter referred to as CBC) with electromagnetic bearings (hereinafter referred to as EMB) of a gas pumping unit (hereinafter referred to as GPU), as well as its operating mode.

[0002] Today, the technical condition of the pulp and paper mill with EMP and its operating mode are determined by the operator when viewing retrospective information.

[0003] Currently, there are several types of dispatch control and management systems (hereinafter referred to as SDKU), with the help of which the technical condition of the pulp and paper mill with EMP and its operating mode are monitored. [Electronic resource. https: / / www.psi.de (Accessed 03.04.2025). Electronic resource. http: / / vniitf.ru / article / pvkVolna (Accessed 03.04.2025)].

[0004] The main disadvantages of the above systems are:

[0005] - the number of mnemonic diagrams reaches several hundred within one gas transportation company;

[0006] - the data contains a large amount of distributed information without the possibility of conducting an analytical assessment of changes in parameters without additional switching between mnemonic diagrams and graphs;

[0007] - absence of recording of the events “Dangerous condition of the pulp and paper mill” in the SDKU archives;

[0008] lack of signaling to the operator about the occurrence of warning and emergency alarms of magnetic bearing control systems (hereinafter referred to as MBCS);

[0009] - the ability for the operator to skip the fact of warning and emergency alarms when viewing retrospective information.

[0010] The objective of the invention is automatic diagnostics of the operating mode of the gas pumping unit (GPU) in order to identify warning and emergency conditions of the GPU.

[0011] Technical result - notification of the operator about the occurrence of dangerous vibration movement, guaranteed recording of this event in the archives.

[0012] The stated task is solved, and the technical result is achieved by implementing an algorithm for diagnosing the technical condition of the GPA SUMP into the SDKU software.

[0013] The proposed algorithm, shown in Fig. 1, consists of seven functional blocks:

[0014] The task of the first block is to record the excess of warning and emergency settings for the axial shift of the rotor.

[0015] The task of the second block is to record the excess of emergency settings for rotor vibration displacements.

[0016] The task of the third block is to record the excess of the emergency settings of the axial force of the electromagnet.

[0017] The task of the fourth block is to record excess currents in the electromagnet winding.

[0018] The task of the fifth block is to determine the operating mode of the gas compressor unit.

[0019] The task of the sixth block is to reset the summary steady state.

[0020] The task of the seventh block is to generate the signal “Dangerous condition of the pulp and paper mill”

[0021] The main stages of the algorithm are:

[0022] 1. Detection of the rotor position in the axial direction and its shift from the initial position: Comparator 1 and comparator 2 compare the values ​​of the rotor shift in the axial direction 3 with the set values ​​4 and 5 of the warning setpoints, comparator 6 and comparator 7 compare the values ​​of the rotor shift in the axial direction 3 with the set values ​​9 and 10 of the emergency setpoints. If the current value 3 is higher than 4 or 9, or lower than 5 or 10 of the set values, then a high level signal is generated at the output of comparators 1, 2, 6 or 7, which is fed to the input of the OR element 49 and generates a high level at its output.

[0023] 2. Determining whether the rotor axial vibration amplitude exceeds the alarm setpoint: Comparator 10 compares the rotor axial vibration amplitude 12 with a preset value 11. If the current value 12 is higher than 11, a high signal level is generated at the output of comparator 10, which is fed to the input of OR element 49 and generates a high level at its output.

[0024] 3. Determining whether the emergency setpoint for the rotor vibration displacement amplitude in the front support (hereinafter referred to as FS) along the X-axis has been exceeded: Comparator 13 compares the value of the rotor vibration displacement amplitude in FS along the X-axis 15 with a preset value 14. If the current value 15 is higher than the set value 14, a high signal level is generated at the output of comparator 13, which is fed to the input of OR element 49 and generates a high level at its output.

[0025] 4. Determining whether the rotor vibration displacement amplitude in the software along the Y axis has exceeded the alarm setpoint: Comparator 16 compares the rotor vibration displacement amplitude in the software along the Y axis 18 with the preset value 17. If the current value 18 is higher than the set value 17, a high signal level is generated at the output of comparator 16, which is fed to the input of OR element 49 and generates a high level at its output.

[0026] 5. Determining whether the rotor vibration displacement amplitude in the rear support (hereinafter referred to as RS) along the X-axis has exceeded the emergency setpoint: Comparator 19 compares the value of the rotor vibration displacement amplitude in the RS along the X-axis 21 with a preset value 20. If the current value 21 is higher than the set value 20, a high signal level is generated at the output of comparator 19, which is fed to the input of OR element 49 and generates a high level at its output.

[0027] 6. Determining whether the rotor vibration displacement amplitude in the Y-axis in the EC has exceeded the alarm setpoint: Comparator 22 compares the value of the rotor vibration displacement amplitude in the Y-axis in the EC 23 with the preset value 24. If the current value 23 is higher than the set value 24, a high signal level is generated at the output of comparator 22, which is fed to the input of OR element 49 and generates a high signal level at its output.

[0028] 7. Determining whether the emergency setpoint of the axial force of the electromagnet has been exceeded: Comparator 25 compares the value of the axial force of the electromagnet 27 with the preset value 26. If the current value 27 is higher than the set value 26, then a high level signal is generated at the output of comparators 25, which is fed to the input of OR element 49 and generates a high level at its output.

[0029] 8. Determining excess current in the electromagnet winding: Comparators 28, 31, 34, 37, 40, 43 compare the current value in the corresponding electromagnets (30, 33, 36, 39, 42, 45) with the preset values ​​29, 32, 35, 38, 41, 44. If the current values ​​30, 33, 36, 39, 42, 45 exceed 29, 32, 35, 38, 41, 44, a high signal level is generated at the outputs of comparators 28, 31, 34, 37, 40, 43, which goes to the input of the OR element 49 and generates a high level at its output.

[0030] 9. A high level at the output of the OR element 48 is formed when one of the GPA modes Ring 44, Ring-Trunk 45, Trunk 46 or Trunk-Ring 47 is present.

[0031] 10. If there are high signal levels at the outputs of OR blocks 48 and 49, a high signal level is also generated at the output of AND block 50. This, in turn, will set trigger 51 to a stable state, where its output will show a high level, independent of changes in the state of the preceding elements. This high level will trigger the "Pulp and Paper Mill Dangerous State" alarm 52 on the operator workstation.

[0032] 11. Reset of any stable state of the module is carried out by comparing the current date 55 and the fixed date 56 in the comparator 53. If the dates 55 and 56 differ, a high signal level is generated at the output of the comparator 53, which is fed to the input of the AND block 58. Also, the clock value of the current date 55 is compared in the comparator 54 with the preset value 57 = 12 h. If the condition is met, a high signal level is generated at the output of the comparator 54, which is fed to the input of the AND block 58. If there are high signal levels at both inputs of the AND block 58, a high signal level is also generated at the output, which is fed to the R input of the trigger 51, thereby resetting its state (every 24 hours at 12 noon, the stable state of the module is reset). Also, the high signal level from the output of block AND 58 goes to the input of block 59, where the current date value is rewritten into the “Fixed Date” variable.

[0033] The effect of the invention is that at the initial stages of the occurrence of dangerous vibration movements, deviations of the compressor rotor from the central positions along three axes or excess of electromagnet currents do not reach critical values ​​leading to an emergency shutdown of the gas compressor unit.

[0034] The effective indicators of the invention are:

[0035] - early warning about the occurrence of abnormal operating modes of the pulp and paper mill and the SUMP due to external causes or malfunctions of compressor elements or its piping;

[0036] - the possibility of taking measures to prevent an emergency shutdown of the gas processing unit, with the possible destruction of the pulp and paper mill elements and its costly repairs.

Claims

A method for determining the technical condition of a centrifugal compressor (CC) with electromagnetic bearings of a gas pumping unit (GPU), according to which the axial shift of the rotor from the initial position, the amplitude of the rotor vibration displacements, the axial force of the electromagnet, the currents in the winding of the electromagnets, the operating mode of the GPU are determined, characterized in that the summary steady state is reset, while in the event of recording an excess of warning and emergency settings for the axial shift of the rotor, emergency settings for the vibration displacement of the rotor, emergency settings for the axial force of the electromagnet, preset values ​​of the currents in the winding of the electromagnets, as well as in the presence of one of the GPU modes: Ring, Ring-Mainline, Mainline or Mainline-Ring, a signal "Dangerous condition of the CC" is generated at the operator's workstation, the operator is notified of the occurrence of a dangerous condition of the CC and this event is recorded in the archives of the dispatching control and management system.

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