Method, device, medium, and computer equipment for identifying surge of centrifugal compressor

Abstract

The present application discloses a method and apparatus, storage medium, and computer equipment for identifying surge of a centrifugal compressor, the method comprising: acquiring a time domain signal collected by a pressure sensor, and a first rotational frequency and a first rotational pressure amplitude of a compressor shaft; performing fast Fourier transform on each time domain signal to obtain a first frequency domain signal; determining a first target frequency range according to the first rotational frequency, and determining a second frequency domain signal from each first frequency domain signal according to the first target frequency range; determining a first target pressure amplitude according to the first rotational pressure amplitude, and judging whether a second target pressure amplitude greater than the first target pressure amplitude exists in the second frequency domain signal; if so, identifying the first frequency from the second frequency domain signal, and determining whether a double frequency and a triple frequency of the first frequency exist in the corresponding first frequency domain signal; and if so, determining that surge exists at the installation position of the corresponding pressure sensor.

Description

Technical Field

[0001] The present application relates to the technical field of surge identification, and in particular to a method and device for identifying surge in a centrifugal compressor, a storage medium, and a computer device. Background Art

[0002] A centrifugal compressor is a vane-type compressor. Its operating principle is based on the impeller applying work to the gas. Within the flow path of the impeller and diffuser, centrifugal pressure-boosting and speed-reducing pressure-diffusion effects are used to convert mechanical energy into gas pressure energy. Due to their stable aerodynamic performance, minimal vibration, and low noise, centrifugal compressors are currently widely used in various domestic and international industries, including wastewater treatment, petrochemicals, and pharmaceuticals.

[0003] Compressor surge is an abnormal operating condition that can occur during the operation of a centrifugal compressor. When the flow rate of a centrifugal compressor decreases to a certain level, periodic, severe air vortices appear in its flow path, causing the airflow within the centrifugal compressor to vibrate violently. At this point, the outlet pressure and flow rate of the centrifugal compressor fluctuate significantly, causing the unit to vibrate violently and be accompanied by periodic, muffled gas flow noise. This phenomenon is called compressor surge. If a centrifugal compressor surges, it can directly affect its operational stability and even damage it. Therefore, it is essential to promptly identify centrifugal compressor surge.

[0004] Conventional methods for identifying surge in centrifugal compressors primarily rely on operators listening to the noise of the airflow in the compressor outlet pipe, observing changes in the compressor outlet pressure and inlet flow rate using pressure and flow measuring instruments, and observing the vibration of the compressor body and bearings. However, these methods suffer from poor accuracy and timeliness. Summary of the Invention

[0005] In view of this, the present application provides a method and device, storage medium, and computer equipment for identifying surge of a centrifugal compressor. By simply setting a pressure sensor on the centrifugal compressor and analyzing the time domain signal collected by the pressure sensor, the surge of the centrifugal compressor can be effectively identified, which can greatly improve the simplicity and timeliness of surge identification; at the same time, the rotation frequency and rotation pressure amplitude of the rotating shaft are combined in the analysis process, so that the actual rotation condition of the rotating shaft can be combined in the surge identification process, rather than using a unified standard for judgment, which can greatly improve the accuracy of surge identification.

[0006] According to one aspect of the present application, a method for identifying surge in a centrifugal compressor is provided, comprising:

[0007] Acquire a time domain signal collected by each pressure sensor, and a first rotational frequency and a first rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when collecting the time domain signal, wherein the pressure sensors include at least a pressure sensor installed at the inlet of a first-stage impeller of the centrifugal compressor and a pressure sensor installed at the outlet of a last-stage impeller;

[0008] Performing a fast Fourier transform on the time domain signal collected by each pressure sensor to obtain a corresponding first frequency domain signal;

[0009] determining a first target frequency range according to the first rotation frequency, and determining a second frequency domain signal from each of the first frequency domain signals according to the first target frequency range;

[0010] determining a first target pressure amplitude according to the first rotation pressure amplitude, and determining whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to the second frequency domain signal;

[0011] When the second target pressure amplitude exists in any second frequency domain signal, the first frequency corresponding to the second target pressure amplitude is identified from the any second frequency domain signal, and it is determined whether the first frequency is twice and three times the first frequency in the first frequency domain signal corresponding to the any second frequency domain signal. When the result is yes, it is determined that surge exists at the installation position of the pressure sensor corresponding to the any second frequency domain signal.

[0012] According to another aspect of the present application, a device for identifying surge of a centrifugal compressor is provided, comprising:

[0013] a signal acquisition module, configured to acquire a time domain signal acquired by each pressure sensor, and a first rotational frequency and a first rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when acquiring the time domain signal, wherein the pressure sensors include at least a pressure sensor installed at the inlet of the first-stage impeller of the centrifugal compressor and a pressure sensor installed at the outlet of the last-stage impeller;

[0014] a signal conversion module, configured to perform fast Fourier transform on the time domain signal collected by each pressure sensor to obtain a corresponding first frequency domain signal;

[0015] a signal determination module, configured to determine a first target frequency range according to the first rotation frequency, and determine a second frequency domain signal from each of the first frequency domain signals according to the first target frequency range;

[0016] a first determining module, configured to determine a first target pressure amplitude according to the first rotation pressure amplitude, and determine whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to the second frequency domain signal;

[0017] The second judgment module is used to identify the first frequency corresponding to the second target pressure amplitude from any second frequency domain signal when the second target pressure amplitude exists in any second frequency domain signal, and determine whether there is a double frequency and a triple frequency of the first frequency in the first frequency domain signal corresponding to any second frequency domain signal. When the result is yes, it is determined that surge exists at the installation position of the pressure sensor corresponding to any second frequency domain signal.

[0018] According to another aspect of the present application, a storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the method for identifying surge of a centrifugal compressor is implemented.

[0019] According to another aspect of the present application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the above-mentioned method for identifying surge of a centrifugal compressor when executing the program.

[0020] By means of the above technical solution, the present application provides a method and apparatus, storage medium, and computer equipment for identifying surge in a centrifugal compressor. First, the time domain signal collected by each pressure sensor can be obtained. The first rotational frequency and first rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when the pressure sensor collects the time domain signal can also be obtained. Subsequently, each time domain signal can be subjected to a fast Fourier transform to obtain a first frequency domain signal corresponding to each time domain signal. A first target frequency range is determined based on the first rotational frequency. The portion of each first frequency domain signal whose frequency falls within the first target frequency range is used as the second frequency domain signal corresponding to the first frequency domain signal. A first target pressure amplitude can also be determined based on the first rotational pressure amplitude. Next, it is determined whether a second target pressure amplitude greater than the first target pressure amplitude exists among the pressure amplitudes corresponding to each second frequency domain signal. If it is determined that a second target pressure amplitude greater than the first target pressure amplitude exists among the multiple pressure amplitudes corresponding to a second frequency domain signal, the first frequency corresponding to the second target pressure amplitude can be identified from the second frequency domain signal. Continue to determine whether the double frequency and triple frequency of the first frequency exist in the first frequency domain signal corresponding to the second frequency domain signal. If the double frequency and triple frequency corresponding to the first frequency exist in the first frequency domain signal at the same time, it means that surge exists at the installation position of the pressure sensor corresponding to the second frequency domain signal. The embodiment of the present application can effectively identify the surge of the centrifugal compressor by only setting a pressure sensor on the centrifugal compressor and analyzing the time domain signal collected by the pressure sensor, which can greatly improve the simplicity and timeliness of surge identification; at the same time, the rotation frequency and rotation pressure amplitude of the rotating shaft are combined in the analysis process, so that the actual rotation condition of the rotating shaft can be combined in the surge identification process, rather than using a unified standard for judgment, which can greatly improve the accuracy of surge identification.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A flow chart of a method for identifying surge in a centrifugal compressor provided in an embodiment of the present application is shown;

[0024] Figure 2A schematic diagram showing the installation position of a pressure sensor for a centrifugal compressor provided in an embodiment of the present application is shown;

[0025] Figure 3 A flow chart of another method for identifying surge in a centrifugal compressor provided in an embodiment of the present application is shown;

[0026] Figure 4 A flow chart of another method for identifying surge in a centrifugal compressor provided in an embodiment of the present application is shown;

[0027] Figure 5 A schematic diagram of a first frequency domain signal provided by an embodiment of the present application is shown;

[0028] Figure 6 A schematic structural diagram of a centrifugal compressor surge identification device provided in an embodiment of the present application is shown;

[0029] Figure 7 A schematic diagram of the device structure of a computer device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0030] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0031] In this embodiment, a method for identifying surge of a centrifugal compressor is provided. Figure 1 As shown, the method includes:

[0032] Step 101: Obtain the time domain signal collected by each pressure sensor, as well as the first rotational frequency and the first rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when collecting the time domain signal, wherein the pressure sensor includes at least a pressure sensor installed at the inlet of the first-stage impeller of the centrifugal compressor, and a pressure sensor installed at the outlet of the last-stage impeller.

[0033] The embodiment of the present application provides a method for identifying surge of a centrifugal compressor, which can timely identify the surge phenomenon of a centrifugal compressor. Centrifugal compressors can be divided into single-stage centrifugal compressors and multi-stage centrifugal compressors. For a single-stage centrifugal compressor, a pressure sensor can be installed at the inlet and outlet of the impeller respectively, and the data collected by these two pressure sensors can be used to determine whether the centrifugal compressor has surge; for a multi-stage centrifugal compressor, a pressure sensor can be installed at the inlet of the first-stage impeller and at the outlet of the last-stage impeller respectively. In addition, a pressure sensor can also be installed at the inlet and outlet of each stage of the impeller. Figure 2The figure shows a schematic diagram of the installation of a pressure sensor for a single-stage centrifugal compressor. When performing surge identification on a centrifugal compressor, first, the time domain signal collected by each pressure sensor can be obtained. Here, the time domain signal can be a signal of pressure changes over time within a period of time, specifically a time domain signal corresponding to 1s or longer. It is also possible to obtain the first rotational frequency and the first rotational pressure amplitude corresponding to the shaft of the centrifugal compressor when the pressure sensor collects the time domain signal. Specifically, the first rotational frequency can be calculated by the rotational speed corresponding to the shaft, and the rotational speed of the shaft can be directly measured or indirectly calculated by a speed measuring instrument or encoder; the first rotational pressure amplitude can be collected by the pressure sensor set on the shaft.

[0034] Step 102 : Perform fast Fourier transform on the time domain signal collected by each pressure sensor to obtain a corresponding first frequency domain signal.

[0035] After obtaining the time domain signal corresponding to each pressure sensor, each time domain signal may be subjected to a fast Fourier transform to obtain a first frequency domain signal corresponding to each time domain signal.

[0036] Step 103: Determine a first target frequency range according to the first rotation frequency, and determine a second frequency domain signal from each of the first frequency domain signals according to the first target frequency range.

[0037] Then, a first target frequency range may be determined according to the first rotation frequency, and a portion of each first frequency domain signal whose frequency is within the first target frequency range is used as a second frequency domain signal corresponding to the first frequency domain signal.

[0038] Step 104 : Determine a first target pressure amplitude according to the first rotation pressure amplitude, and determine whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to the second frequency domain signal.

[0039] In addition, a first target pressure amplitude may be determined based on the first rotation pressure amplitude. Thereafter, it is determined whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to each second frequency domain signal.

[0040] Step 105: When the second target pressure amplitude exists in any second frequency domain signal, identify the first frequency corresponding to the second target pressure amplitude from any second frequency domain signal, and determine whether there is a double frequency and a triple frequency of the first frequency in the first frequency domain signal corresponding to any second frequency domain signal. When the result is yes, determine that surge exists at the installation position of the pressure sensor corresponding to any second frequency domain signal.

[0041] If it is determined that a second target pressure amplitude greater than the first target pressure amplitude exists among the multiple pressure amplitudes corresponding to a second frequency domain signal, then the first frequency corresponding to the second target pressure amplitude can be identified from the second frequency domain signal. Next, it is determined whether the first frequency domain signal corresponding to the second frequency domain signal (that is, the original first frequency domain signal of the second frequency domain signal) contains the double frequency and triple frequency of the first frequency. If the first frequency domain signal contains both the double frequency and triple frequency corresponding to the first frequency, then it indicates that surge exists at the installation location of the pressure sensor corresponding to the second frequency domain signal. Surge identification is thus completed at the installation location of each pressure sensor.

[0042] By applying the technical solution of this embodiment, first, the time domain signal collected by each pressure sensor can be obtained. Furthermore, the first rotational frequency and first rotational pressure amplitude corresponding to the centrifugal compressor's rotating shaft when the pressure sensor collects the time domain signal can be obtained. Subsequently, each time domain signal can be subjected to a fast Fourier transform to obtain a first frequency domain signal corresponding to each time domain signal. A first target frequency range is determined based on the first rotational frequency. The portion of each first frequency domain signal whose frequency falls within the first target frequency range is used as the second frequency domain signal corresponding to the first frequency domain signal. A first target pressure amplitude can also be determined based on the first rotational pressure amplitude. Next, a determination is made as to whether, among the pressure amplitudes corresponding to each second frequency domain signal, a second target pressure amplitude greater than the first target pressure amplitude exists. If, after determination, a second target pressure amplitude greater than the first target pressure amplitude exists among the multiple pressure amplitudes corresponding to a particular second frequency domain signal, the first frequency corresponding to the second target pressure amplitude can be identified from the second frequency domain signal. The first frequency domain signal corresponding to the second frequency domain signal is then determined as to whether double and triple frequencies of the first frequency exist in the first frequency domain signal corresponding to the second frequency domain signal. If the first frequency domain signal contains both the double frequency and the triple frequency corresponding to the first frequency, then it indicates that surge exists at the installation location of the pressure sensor corresponding to the second frequency domain signal. The embodiment of the present application only requires the installation of a pressure sensor on the centrifugal compressor and the analysis of the time domain signal collected by the pressure sensor to effectively identify surge in the centrifugal compressor, which can greatly improve the simplicity and timeliness of surge identification. At the same time, the rotation frequency and the rotation pressure amplitude of the rotating shaft are combined in the analysis process, so that the actual rotation of the rotating shaft can be combined in the surge identification process, rather than using a unified standard for judgment, which can greatly improve the accuracy of surge identification.

[0043] Furthermore, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another method for identifying surge of a centrifugal compressor is provided, such as Figure 3 As shown, the method includes:

[0044] Step 201: Obtain the time domain signal collected by each pressure sensor, as well as the first rotation frequency and the first rotation pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when collecting the time domain signal, wherein the pressure sensor includes at least a pressure sensor installed at the inlet of the first-stage impeller of the centrifugal compressor, and a pressure sensor installed at the outlet of the last-stage impeller.

[0045] Step 202 : Perform fast Fourier transform on the time domain signal collected by each pressure sensor to obtain a corresponding first frequency domain signal.

[0046] Step 203: multiply the first rotation frequency by a first coefficient to obtain a second frequency, take a range smaller than the second frequency as the first target frequency range, and determine a second frequency domain signal from each of the first frequency domain signals based on the first target frequency range, wherein the first coefficient is extracted based on historical frequency domain signal samples.

[0047] In this embodiment, the first coefficient can be extracted in advance using the historical frequency domain signal samples of the centrifugal compressor, and then the second frequency can be obtained by multiplying the first coefficient by the first rotation frequency, and the range smaller than the second frequency can be used as the first target frequency range. For example, if the second frequency is f2, then the first target frequency range can be 0 to f2. After determining the first target frequency range, the signal portion with a frequency horizontal coordinate in the range of 0 to f2 can be determined from the first frequency domain signal as the second frequency domain signal. Here, the first coefficient can be determined based on an empirical value, specifically 10%, or it can be determined by other means. In the embodiment of the present application, the first target frequency range is determined by the first coefficient, and then the second frequency domain signal is determined based on the first target frequency range. Subsequently, the judgment range can be effectively narrowed, thereby greatly improving the judgment efficiency.

[0048] Step 204: multiply the first rotational pressure amplitude by a second coefficient to obtain a first target pressure amplitude, and determine whether there is a second target pressure amplitude greater than the first target pressure amplitude in the pressure amplitudes corresponding to the second frequency domain signal, wherein the second coefficient is extracted based on the historical frequency domain signal samples.

[0049] In this embodiment, the second coefficient can also be extracted in advance using the historical frequency domain signal samples of the centrifugal compressor, and then the first target pressure amplitude is obtained by multiplying the second coefficient by the first rotational pressure amplitude. Here, the second coefficient can be determined based on an empirical value, specifically 50%, or it can be determined by other means. Afterwards, it can be determined whether there is a second target pressure amplitude greater than the first target pressure amplitude in the pressure amplitude corresponding to the second frequency domain signal. The first target pressure amplitude is used to indicate an abnormal pressure limit. If there is a second target pressure amplitude greater than the first target pressure amplitude in the pressure amplitude corresponding to the second frequency domain signal, then it means that there is a high probability of surge at the installation location of this pressure sensor, and subsequent judgment can be continued. In other words, a preliminary judgment of surge can be achieved through the first target pressure amplitude.

[0050] Step 205: When the second target pressure amplitude does not exist in each of the second frequency domain signals, it is determined that the centrifugal compressor does not experience surge.

[0051] In this embodiment, if there is no second target pressure amplitude in the second frequency domain signal corresponding to each pressure sensor, that is, there is no pressure amplitude greater than the first target pressure amplitude, it means that there is no abnormal pressure amplitude in the second frequency domain signal, that is, the centrifugal compressor operates normally and there is no surge.

[0052] Step 206: When the second target pressure amplitude exists in any second frequency domain signal, identify the first frequency corresponding to the second target pressure amplitude from any second frequency domain signal, and determine whether there is a double frequency and a triple frequency of the first frequency in the first frequency domain signal corresponding to any second frequency domain signal; Step 207: When the result is yes, determine that there is surge at the installation position of the pressure sensor corresponding to any second frequency domain signal; Step 208: When there is no double frequency and / or triple frequency of the first frequency in the first frequency domain signal corresponding to any second frequency domain signal, determine that there is no surge at the installation position of the pressure sensor corresponding to any second frequency domain signal.

[0053] In this embodiment, if, among the second frequency domain signals corresponding to multiple pressure sensors, a second frequency domain signal has a second target pressure amplitude greater than the first target pressure amplitude, then the first frequency of the second target pressure amplitude in the corresponding second frequency domain signal can be further determined. Furthermore, in the first frequency domain signal corresponding to the second frequency domain signal, it is determined whether there are double and triple frequencies of the first frequency. If both double and triple frequencies corresponding to the first frequency are present in the first frequency domain signal corresponding to the second frequency domain signal, then surge is present at the installation location of the pressure sensor corresponding to the second frequency domain signal. If only double or triple frequencies of the first frequency are present in the first frequency domain signal corresponding to the second frequency domain signal, or neither double nor triple frequencies of the first frequency are present in the first frequency domain signal corresponding to the second frequency domain signal, then surge is not present at the installation location of the pressure sensor corresponding to the second frequency domain signal.

[0054] For example, assuming that the second frequency domain signal is F'(ω), the corresponding first frequency domain signal is F(ω), the second target pressure amplitude is Af, and the first frequency f1 corresponding to Af is found in the second frequency domain signal F'(ω), then it can be further determined whether 2*f1 and 3*f1 exist in the first frequency domain signal F(ω). If 2*f1 and 3*f1 exist at the same time, it means that surge exists at the installation position of the pressure sensor corresponding to the second frequency domain signal F'(ω) or the first frequency domain signal F(ω).

[0055] In an embodiment of the present application, optionally, after step 207, the method further includes: performing surge control on the centrifugal compressor according to a preset surge control strategy, and starting timing, wherein the preset surge control strategy includes increasing flow and / or opening a throttle valve; when the timing time reaches a preset time threshold, returning to the step of obtaining the time domain signal collected by each pressure sensor, until there is no surge at the installation position of each of the pressure sensors, and stopping performing surge control on the centrifugal compressor.

[0056] In this embodiment, when surge occurs at the installation location of a certain pressure sensor, then the centrifugal compressor can be subjected to surge control according to a preset surge control strategy. Here, the preset surge control strategy can be to increase the flow rate, open the throttle valve, etc. Specifically, each time surge control is performed according to the preset surge control strategy, control can be performed according to a preset duration. For example, the time for increasing the flow rate and opening the throttle valve each time is t1, and surge control is stopped after t1. In addition, each surge control can also be performed according to a preset flow increase amount and a preset throttle valve opening increase. The method of surge control is not required here. While performing surge control on the centrifugal compressor, timing can also be started, and when the timing time reaches the preset time threshold, the process returns to step 201 again, the time domain signal collected by each pressure sensor is re-acquired, and the subsequent surge judgment process is executed. That is, a new round of surge judgment process is not carried out when the surge control strategy is executed, but a new round of surge judgment process is carried out after a period of time, so that the centrifugal compressor can be adjusted for a certain period of time after surge control, avoiding the centrifugal compressor not being adjusted under the surge control strategy before the next round of surge judgment process is carried out, which affects the accuracy of subsequent judgments.

[0057] In addition, if after the next round of surge judgment process is completed, it is found that surge still exists at the installation location of one or some pressure sensors, then the preset surge control strategy can be repeatedly executed at this time until a round of surge judgment process is completed and it is found that there is no surge at the installation location of each pressure sensor. Subsequently, after the centrifugal compressor resumes normal operation after surge control, it can return to step 201 again after a certain interval, reacquire the time domain signal collected by each pressure sensor, and repeat the surge judgment process. Specifically, during the operation of the centrifugal compressor, the surge judgment process can be executed once at a certain interval, and the execution time interval can be determined according to demand to ensure that the surge phenomenon can be detected in time during the operation of the centrifugal compressor, surge control can be performed in time, and the centrifugal compressor can be ensured to operate smoothly and safely.

[0058] In an embodiment of the present application, optionally, after step 207, the method further includes: determining whether surge exists at the installation positions of any two adjacent pressure sensors, and when the result is yes, determining that overall surge exists between the installation positions of the any two adjacent pressure sensors.

[0059] In this embodiment, if surge occurs at the installation locations of every two adjacent pressure sensors, it indicates that overall surge exists between the installation locations of the two pressure sensors. For example, for a single-stage centrifugal compressor, if surge occurs at the installation locations of the pressure sensors at both the impeller inlet and the impeller outlet, it indicates that overall surge exists in the centrifugal compressor. For a multi-stage centrifugal compressor, if surge occurs at the installation locations of the pressure sensors at both the impeller inlet and the impeller outlet of a particular stage, it indicates that overall surge exists in the impeller of that stage of the centrifugal compressor.

[0060] In an embodiment of the present application, optionally, after the "surge control of the centrifugal compressor according to a preset surge control strategy", the method further includes: recording the number of surge controls, and when the number of surge controls reaches a preset threshold, generating a stop request for the centrifugal compressor, and sending the stop request to a preset authorization terminal; after receiving the authorization approval information from the preset authorization terminal, controlling the centrifugal compressor to stop running.

[0061] In this embodiment, when surge control is performed on the centrifugal compressor for the first time, the number of surge controls can be recorded. If the recorded number of surge controls reaches a preset threshold, it means that the centrifugal compressor has not resumed normal operation after multiple surge controls, and continuing to perform surge control according to the preset surge control strategy may not necessarily enable the centrifugal compressor to resume normal operation. Therefore, a stop request for the centrifugal compressor can be generated, and the stop request can be sent to a preset authorization terminal. Here, the preset authorization terminal can be a terminal corresponding to the operator or manager of the centrifugal compressor. When the stop request is displayed on the terminal, the operator or manager can authorize the stop request, specifically by triggering the authorization icon on the terminal. Afterwards, the authorization approval information fed back by the preset authorization terminal can be received, and the centrifugal compressor can be controlled to stop running according to the authorization approval information. The embodiment of the present application automatically generates a stop operation request after the preset surge control strategy is executed on the centrifugal compressor multiple times and the centrifugal compressor still does not resume normal operation, and controls the centrifugal compressor to stop operation only after authorization. This can promptly remind the operator or manager that the centrifugal compressor needs to be stopped, and the operator or manager can control the centrifugal compressor to stop only through simple authorization, which is simple and convenient.

[0062] In an embodiment of the present application, optionally, before step 203, the method further includes: obtaining historical frequency domain signal samples, and the second rotational frequency and second rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when the historical frequency domain signal samples are collected, wherein the historical frequency domain signal samples include a first historical frequency domain sample and a second historical frequency domain sample, the first historical frequency domain sample is a frequency domain signal sample corresponding to the historical normal operation of the centrifugal compressor, and the second historical frequency domain sample is a frequency domain signal sample corresponding to the historical surge of the centrifugal compressor; using a frequency range smaller than the second rotational frequency as a second target frequency range corresponding to the historical frequency domain signal sample, determining a third target pressure amplitude according to the second target frequency range corresponding to the first historical frequency domain sample, and determining a fourth target pressure amplitude according to the second target frequency range corresponding to the second historical frequency domain sample; determining a fourth target pressure amplitude according to the third target pressure amplitude and the second target pressure amplitude Four target pressure amplitudes are used to identify multiple abnormal pressure amplitudes corresponding to surge in the centrifugal compressor; the abnormal frequency corresponding to each abnormal pressure amplitude is determined from the second historical frequency domain samples, and it is judged whether there is a double frequency and a triple frequency corresponding to the abnormal frequency in the second historical frequency domain samples; when any abnormal frequency corresponds to a double frequency and a triple frequency in the second historical frequency domain samples, the any abnormal frequency is used as the target abnormal frequency, and the abnormal pressure amplitude corresponding to the target abnormal frequency is used as the target abnormal pressure amplitude; a first candidate coefficient is determined based on each target abnormal frequency and the second rotation frequency corresponding to the target abnormal frequency, and the largest first candidate coefficient is used as the first coefficient; and a second candidate coefficient is determined based on each target abnormal pressure amplitude and the second rotation pressure amplitude corresponding to the target abnormal pressure amplitude, and the smallest second candidate coefficient is used as the second coefficient.

[0063] In this embodiment, the first and second coefficients can be extracted from historical frequency domain signal samples of the centrifugal compressor. First, historical frequency domain signal samples can be obtained. Here, the historical frequency domain signal samples can include a first historical frequency domain sample and a second historical frequency domain sample. The first historical frequency domain sample refers to a frequency domain signal sample corresponding to normal operation of the centrifugal compressor in the past, and the second historical frequency domain sample refers to a frequency domain signal sample corresponding to surge in the centrifugal compressor in the past. The first and second historical frequency domain samples are both samples consisting of signals corresponding to frequency and pressure amplitude. The first and second historical frequency domain samples can be converted from time domain signals collected by pressure sensors installed at different locations. The second rotational frequency and second rotational pressure amplitude corresponding to the centrifugal compressor shaft at the time the historical frequency domain signal samples were collected can also be obtained. Since the historical frequency domain signal samples include multiple first historical frequency domain samples and multiple second historical frequency domain samples, the second rotational frequency and second rotational pressure amplitude are also the second rotational frequency and second rotational pressure amplitude corresponding to the centrifugal compressor shaft at the time each first historical frequency domain sample or each second historical frequency domain sample was collected. That is, the second rotation frequency and the second rotation pressure amplitude correspond to each first historical frequency domain sample or each second historical frequency domain sample.

[0064] After obtaining the second rotation frequency corresponding to each historical frequency domain signal sample (i.e., the first historical frequency domain sample and the second historical frequency domain sample mentioned above), the second target frequency range corresponding to each historical frequency domain sample can be determined based on the second rotation frequency, and the third target pressure amplitude can be determined from the first historical frequency domain sample based on the second target frequency range corresponding to each first historical frequency domain sample, that is, the frequencies within the second target frequency range are determined from the first historical frequency domain sample, and the pressure amplitudes corresponding to these frequencies are determined as the third target pressure amplitude; and the fourth target pressure amplitude can be determined from the second historical frequency domain sample based on the second target frequency range corresponding to each second historical frequency domain sample, that is, the frequencies within the second target frequency range are determined from the second historical frequency domain sample, and the pressure amplitudes corresponding to these frequencies are determined as the fourth target pressure amplitude. Specifically, for each historical frequency domain signal sample, a frequency range that is less than the second rotation frequency corresponding to the historical frequency domain signal sample can be used as the second target frequency range.

[0065] Subsequently, the third target pressure amplitude values ​​in the plurality of first historical frequency domain samples can be compared with the fourth target pressure amplitude values ​​in the plurality of second historical frequency domain samples. Pressure amplitudes that are significantly different from the third target pressure amplitude can be identified from the fourth target pressure amplitude values, and these pressure amplitudes can be determined as abnormal pressure amplitudes. In this embodiment, a value that is a certain percentage greater than the average value of the third target pressure amplitude can be used as a benchmark to identify abnormal pressure amplitudes. These abnormal pressure amplitudes would not occur during normal operation of the centrifugal compressor. For each identified abnormal pressure amplitude value, the abnormal frequency corresponding to the abnormal pressure amplitude can be determined from the corresponding second historical frequency domain samples, and further, the presence of a double or triple frequency corresponding to the abnormal frequency in the horizontal axis frequency can be determined from the second historical frequency domain samples. If a certain abnormal frequency has a double or triple frequency in the corresponding second historical frequency domain samples, the abnormal frequency can be used as the target abnormal frequency, and the abnormal pressure amplitude corresponding to the target abnormal frequency can be used as the target abnormal pressure amplitude.

[0066] After determining multiple target abnormal frequencies and target abnormal pressure amplitudes from multiple second historical frequency domain samples, on the one hand, a first candidate coefficient can be calculated based on each target abnormal frequency, and the largest first candidate coefficient among these first candidate coefficients can be used as the first coefficient. Specifically, the second rotational frequency corresponding to each target abnormal frequency can be divided by the target abnormal frequency to obtain the first candidate coefficient. On the other hand, a second candidate coefficient can be calculated based on each target abnormal pressure amplitude, and the smallest second candidate coefficient among these second candidate coefficients can be used as the second coefficient. Specifically, the second rotational pressure amplitude corresponding to each target abnormal pressure amplitude can be divided by the target abnormal pressure amplitude to obtain the second candidate coefficient. In the embodiment of the present application, by determining the first coefficient and subsequently determining the second frequency domain signal for surge determination based on the first coefficient, it is possible to ensure that all abnormalities are included in the second frequency domain signal while effectively reducing the determination range and improving determination efficiency. By determining the second coefficient and subsequently determining the pressure amplitude range for surge determination based on the second coefficient, it is possible to effectively limit the lower limit of the abnormal pressure amplitude, facilitate and quickly find the abnormal pressure amplitude from the pressure amplitude of the second frequency domain signal, and improve the recognition efficiency and accuracy of the abnormal pressure amplitude.

[0067] Furthermore, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another method for identifying surge of a centrifugal compressor is provided, such as Figure 4 As shown, the method includes:

[0068] Before identifying the surge of a centrifugal compressor, first, pressure sensors can be installed at the first-stage impeller inlet and the last-stage impeller outlet of the centrifugal compressor. You can also set an interval time t. When the centrifugal compressor is running, each pressure sensor starts to collect time domain signals after every time t. Here, the time domain signal collected each time can be a time domain signal of pressure pulsation with a duration of ts=1s, or a time domain signal of pressure pulsation with any duration. According to the sampling theorem, the sampling frequency needs to be 2 to the power of n data. For example, 2 10 =1024. The more signals collected in this step, the higher the accuracy during frequency analysis. Then, the time domain signal collected by each pressure sensor is converted into a first frequency domain signal using the fast Fourier transform (FFT) method. In this embodiment, the following process can be performed for the time domain signal collected by each pressure sensor: the first coefficient can be 10%, the first rotation frequency of the rotating shaft of the centrifugal compressor when collecting the time domain signal can be fr, then the second frequency can be 0.1*fr, and the frequency f less than the second frequency is identified. Here, the range corresponding to the frequency less than the second frequency can be called the first target frequency range, and the frequency f falls within the first target frequency range. According to the first target frequency range, the second frequency domain signal corresponding to each first frequency domain signal can be determined. The first rotation pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when collecting the time domain signal can be called Afr, the second coefficient can be 50%, and the first target pressure amplitude can be 0.5*Afr. Then, the pressure amplitude greater than the first target pressure amplitude (that is, the above-mentioned second target pressure amplitude, referred to as Af) can be identified from the pressure amplitude corresponding to the second frequency domain signal, and the frequency corresponding to Af (that is, the above-mentioned first frequency) (f1) can be determined in the second frequency domain signal. Further, it is determined whether there is a double frequency (f2=2*f1) and a triple frequency (f3=3*f1) of the frequency f1 in the first frequency domain signal corresponding to the pressure sensor. f2 and f3 do not have to be less than 0.1*fr. If f2 and f3 exist, it can be determined that there is surge at the installation position of the pressure sensor; if there is surge at the installation position of each pressure sensor, it means that there is overall surge in the centrifugal compressor; if there is surge in the pressure sensor installed at the inlet of the first-stage impeller, and there is no surge in the pressure sensor installed at the outlet of the last-stage impeller, then it can be determined as compressor inlet surge; if there is no surge in the pressure sensor installed at the inlet of the first-stage impeller, and there is surge in the pressure sensor installed at the outlet of the last-stage impeller, then it can be determined as compressor outlet surge. From Figure 5The relationship between the various values ​​can be seen. If it is determined that no surge has occurred at any position of the centrifugal compressor, then after an interval t, each pressure sensor is controlled again to collect time domain signals for surge identification. If surge is determined, surge control is performed, such as increasing the flow rate, opening the throttle valve, etc. After an interval t, each pressure sensor is controlled again to collect time domain signals for surge identification until the surge phenomenon disappears. Surge control is then stopped, and after an interval t, each pressure sensor is controlled again to collect time domain signals and surge identification is performed again until the centrifugal compressor stops operating.

[0069] Further, as Figure 1 The specific implementation of the method, the embodiment of the present application provides a centrifugal compressor surge identification device, such as Figure 6 As shown, the device includes:

[0070] a signal acquisition module, configured to acquire a time domain signal acquired by each pressure sensor, and a first rotational frequency and a first rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when acquiring the time domain signal, wherein the pressure sensors include at least a pressure sensor installed at the inlet of the first-stage impeller of the centrifugal compressor and a pressure sensor installed at the outlet of the last-stage impeller;

[0071] a signal conversion module, configured to perform fast Fourier transform on the time domain signal collected by each pressure sensor to obtain a corresponding first frequency domain signal;

[0072] a signal determination module, configured to determine a first target frequency range according to the first rotation frequency, and determine a second frequency domain signal from each of the first frequency domain signals according to the first target frequency range;

[0073] a first determining module, configured to determine a first target pressure amplitude according to the first rotation pressure amplitude, and determine whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to the second frequency domain signal;

[0074] The second judgment module is used to identify the first frequency corresponding to the second target pressure amplitude from any second frequency domain signal when the second target pressure amplitude exists in any second frequency domain signal, and determine whether there is a double frequency and a triple frequency of the first frequency in the first frequency domain signal corresponding to any second frequency domain signal. When the result is yes, it is determined that surge exists at the installation position of the pressure sensor corresponding to any second frequency domain signal.

[0075] Optionally, the device further comprises:

[0076] a third judgment module, configured to, after judging whether there is a second target pressure amplitude greater than the first target pressure amplitude in the pressure amplitudes corresponding to the second frequency domain signals, judge that surge does not exist in the centrifugal compressor when the second target pressure amplitude does not exist in any of the second frequency domain signals;

[0077] The device further comprises:

[0078] a surge judgment module, configured to, after determining whether a double frequency and a triple frequency of the first frequency exist in the first frequency domain signal corresponding to any of the second frequency domain signals, determine that surge does not exist at an installation location of the pressure sensor corresponding to any of the second frequency domain signals when the double frequency and / or the triple frequency of the first frequency do not exist in the first frequency domain signal corresponding to any of the second frequency domain signals;

[0079] The surge judgment module is further configured to, after determining that surge exists at the installation position of the pressure sensor corresponding to any one of the second frequency domain signals, determine whether surge exists at the installation positions of any two adjacent pressure sensors, and when the result is yes, determine that overall surge exists between the installation positions of the any two adjacent pressure sensors.

[0080] Optionally, the signal determination module is further configured to:

[0081] multiplying the first rotation frequency by a first coefficient to obtain a second frequency, and setting a range smaller than the second frequency as the first target frequency range, wherein the first coefficient is extracted based on historical frequency domain signal samples;

[0082] The first judgment module is further configured to:

[0083] The first rotational pressure amplitude is multiplied by a second coefficient to obtain a first target pressure amplitude, wherein the second coefficient is extracted based on the historical frequency domain signal samples.

[0084] Optionally, the device further comprises:

[0085] a sample acquisition module, configured to acquire, before multiplying the first rotational frequency by a first coefficient to obtain a second frequency, a historical frequency domain signal sample, and a second rotational frequency and a second rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when the historical frequency domain signal sample is acquired, wherein the historical frequency domain signal sample includes a first historical frequency domain sample and a second historical frequency domain sample, the first historical frequency domain sample being a frequency domain signal sample corresponding to a historical normal operation of the centrifugal compressor, and the second historical frequency domain sample being a frequency domain signal sample corresponding to a historical surge occurrence of the centrifugal compressor;

[0086] a pressure amplitude determination module, configured to use a frequency range less than the second rotational frequency as a second target frequency range corresponding to the historical frequency domain signal samples, determine a third target pressure amplitude based on the second target frequency range corresponding to the first historical frequency domain samples, and determine a fourth target pressure amplitude based on the second target frequency range corresponding to the second historical frequency domain samples;

[0087] an identification module, configured to identify, based on the third target pressure amplitude and the fourth target pressure amplitude, a plurality of abnormal pressure amplitudes corresponding to surge occurring in the centrifugal compressor;

[0088] a frequency determination module, configured to determine an abnormal frequency corresponding to each abnormal pressure amplitude from the second historical frequency domain samples, and determine whether a double frequency and a triple frequency corresponding to the abnormal frequency exist in the second historical frequency domain samples; when any abnormal frequency corresponds to a double frequency and a triple frequency in the second historical frequency domain samples, use the any abnormal frequency as a target abnormal frequency, and use the abnormal pressure amplitude corresponding to the target abnormal frequency as a target abnormal pressure amplitude;

[0089] A coefficient determination module is used to determine a first candidate coefficient based on each target abnormal frequency and the second rotational frequency corresponding to the target abnormal frequency, and to use the largest first candidate coefficient as the first coefficient; and to determine a second candidate coefficient based on each target abnormal pressure amplitude and the second rotational pressure amplitude corresponding to the target abnormal pressure amplitude, and to use the smallest second candidate coefficient as the second coefficient.

[0090] Optionally, the device further comprises:

[0091] A surge control module is used to determine that surge exists at the installation location of the pressure sensor corresponding to any one of the second frequency domain signals, and then perform surge control on the centrifugal compressor according to a preset surge control strategy and start timing, wherein the preset surge control strategy includes increasing the flow rate and / or opening the throttle valve; when the timing time reaches a preset time threshold, return to the step of obtaining the time domain signal collected by each pressure sensor, and stop performing surge control on the centrifugal compressor until surge does not exist at the installation location of each of the pressure sensors.

[0092] Optionally, the device further comprises:

[0093] a times recording module, configured to record the number of surge controls after surge control is performed on the centrifugal compressor according to a preset surge control strategy, and generate a stop request for the centrifugal compressor when the surge control number reaches a preset times threshold, and send the stop request to a preset authorization terminal;

[0094] The operation control module is used to control the centrifugal compressor to stop running after receiving the authorization approval information from the preset authorization terminal.

[0095] It should be noted that for other corresponding descriptions of the functional units involved in the centrifugal compressor surge identification device provided in the embodiment of the present application, reference can be made to Figures 1 to 5 The corresponding description in the method will not be repeated here.

[0096] The present application also provides a computer device, which can be a personal computer, a server, a network device, etc. Figure 7 As shown, the computer device includes a bus, a processor, a memory, and a communication interface, and may also include an input / output interface and a display device. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store location information. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the steps of each method embodiment are implemented.

[0097] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0098] In one embodiment, a computer-readable storage medium is provided. The computer-readable storage medium may be non-volatile or volatile, and stores a computer program thereon. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0099] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0100] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0101] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0102] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for identifying surge in a centrifugal compressor, characterized in that: include: Acquire a time domain signal collected by each pressure sensor, and a first rotational frequency and a first rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when collecting the time domain signal, wherein the pressure sensors include at least a pressure sensor installed at the inlet of a first-stage impeller of the centrifugal compressor and a pressure sensor installed at the outlet of a last-stage impeller; Performing a fast Fourier transform on the time domain signal collected by each pressure sensor to obtain a corresponding first frequency domain signal; determining a first target frequency range according to the first rotation frequency, and determining a second frequency domain signal from each of the first frequency domain signals according to the first target frequency range; determining a first target pressure amplitude according to the first rotation pressure amplitude, and determining whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to the second frequency domain signal; When the second target pressure amplitude exists in any second frequency domain signal, the first frequency corresponding to the second target pressure amplitude is identified from the any second frequency domain signal, and it is determined whether the first frequency is twice and three times the first frequency in the first frequency domain signal corresponding to the any second frequency domain signal. When the result is yes, it is determined that surge exists at the installation position of the pressure sensor corresponding to the any second frequency domain signal.

2. The method according to claim 1, characterized in that After determining whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to the second frequency domain signal, the method further includes: When the second target pressure amplitude does not exist in each of the second frequency domain signals, it is determined that the centrifugal compressor does not experience surge; After determining whether a frequency doubled or tripled than the first frequency exists in the first frequency domain signal corresponding to any one of the second frequency domain signals, the method further includes: When the double frequency and / or triple frequency of the first frequency does not exist in the first frequency domain signal corresponding to any one of the second frequency domain signals, determining that surge does not exist at the installation position of the pressure sensor corresponding to any one of the second frequency domain signals; After determining that surge exists at the installation location of the pressure sensor corresponding to any one of the second frequency domain signals, the method further includes: It is determined whether surge exists at the installation positions of any two adjacent pressure sensors, and when the result is yes, it is determined that overall surge exists between the installation positions of the any two adjacent pressure sensors.

3. The method according to claim 1, characterized in that The determining of a first target frequency range according to the first rotation frequency includes: multiplying the first rotation frequency by a first coefficient to obtain a second frequency, and setting a range smaller than the second frequency as the first target frequency range, wherein the first coefficient is extracted based on historical frequency domain signal samples; Determining a first target pressure amplitude according to the first rotation pressure amplitude includes: The first rotational pressure amplitude is multiplied by a second coefficient to obtain a first target pressure amplitude, wherein the second coefficient is extracted based on the historical frequency domain signal samples.

4. The method according to claim 3, characterized in that Before multiplying the first rotation frequency by a first coefficient to obtain a second frequency, the method further includes: Acquiring historical frequency domain signal samples, as well as a second rotational frequency and a second rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when the historical frequency domain signal samples are collected, wherein the historical frequency domain signal samples include a first historical frequency domain sample and a second historical frequency domain sample, the first historical frequency domain sample is a frequency domain signal sample corresponding to a historical normal operation of the centrifugal compressor, and the second historical frequency domain sample is a frequency domain signal sample corresponding to a historical surge occurrence of the centrifugal compressor; using a frequency range less than the second rotation frequency as a second target frequency range corresponding to the historical frequency domain signal samples, determining a third target pressure amplitude based on the second target frequency range corresponding to the first historical frequency domain samples, and determining a fourth target pressure amplitude based on the second target frequency range corresponding to the second historical frequency domain samples; identifying, according to the third target pressure amplitude and the fourth target pressure amplitude, a plurality of abnormal pressure amplitudes corresponding to surge occurring in the centrifugal compressor; determining an abnormal frequency corresponding to each abnormal pressure amplitude from the second historical frequency domain samples, and determining whether a double frequency and a triple frequency corresponding to the abnormal frequency exist in the second historical frequency domain samples; when any abnormal frequency corresponds to a double frequency and a triple frequency in the second historical frequency domain samples, using the any abnormal frequency as a target abnormal frequency, and using the abnormal pressure amplitude corresponding to the target abnormal frequency as a target abnormal pressure amplitude; According to each target abnormal frequency and the second rotational frequency corresponding to the target abnormal frequency, a first candidate coefficient is determined, and the largest first candidate coefficient is used as the first coefficient; and, according to each target abnormal pressure amplitude and the second rotational pressure amplitude corresponding to the target abnormal pressure amplitude, a second candidate coefficient is determined, and the smallest second candidate coefficient is used as the second coefficient.

5. The method according to claim 1, wherein After determining that surge exists at the installation location of the pressure sensor corresponding to any one of the second frequency domain signals, the method further includes: Performing surge control on the centrifugal compressor according to a preset surge control strategy and starting timing, wherein the preset surge control strategy includes increasing flow and / or opening a throttle valve; When the timing time reaches the preset time threshold, the process returns to the step of obtaining the time domain signal collected by each pressure sensor, and stops performing surge control on the centrifugal compressor until there is no surge at the installation position of each pressure sensor.

6. The method according to claim 5, characterized in that After performing surge control on the centrifugal compressor according to the preset surge control strategy, the method further includes: Recording the number of surge control times, generating a stop request for the centrifugal compressor when the surge control number reaches a preset threshold, and sending the stop request to a preset authorization terminal; When the authorization pass information of the preset authorization terminal is received, the centrifugal compressor is controlled to stop running.

7. A centrifugal compressor surge identification device, characterized in that: include: a signal acquisition module, configured to acquire a time domain signal acquired by each pressure sensor, and a first rotational frequency and a first rotational pressure amplitude corresponding to the rotating shaft of the centrifugal compressor when acquiring the time domain signal, wherein the pressure sensors include at least a pressure sensor installed at the inlet of the first-stage impeller of the centrifugal compressor and a pressure sensor installed at the outlet of the last-stage impeller; a signal conversion module, configured to perform fast Fourier transform on the time domain signal collected by each pressure sensor to obtain a corresponding first frequency domain signal; a signal determination module, configured to determine a first target frequency range according to the first rotation frequency, and determine a second frequency domain signal from each of the first frequency domain signals according to the first target frequency range; a first determining module, configured to determine a first target pressure amplitude according to the first rotation pressure amplitude, and determine whether there is a second target pressure amplitude greater than the first target pressure amplitude among the pressure amplitudes corresponding to the second frequency domain signal; The second judgment module is used to identify the first frequency corresponding to the second target pressure amplitude from any second frequency domain signal when the second target pressure amplitude exists in any second frequency domain signal, and determine whether there is a double frequency and a triple frequency of the first frequency in the first frequency domain signal corresponding to any second frequency domain signal. When the result is yes, it is determined that surge exists at the installation position of the pressure sensor corresponding to any second frequency domain signal.

8. The device according to claim 7, characterized in that The device further comprises: A surge control module is used to determine that surge exists at the installation location of the pressure sensor corresponding to any one of the second frequency domain signals, and then perform surge control on the centrifugal compressor according to a preset surge control strategy and start timing, wherein the preset surge control strategy includes increasing the flow rate and / or opening the throttle valve; when the timing time reaches a preset time threshold, return to the step of obtaining the time domain signal collected by each pressure sensor, and stop performing surge control on the centrifugal compressor until surge does not exist at the installation location of each of the pressure sensors.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

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