Classified anti-surge control method and device for four-stage compressor, terminal and storage medium

Abstract

The invention provides a grading anti-surge control method and device for a four-stage compressor, a terminal and a storage medium, and relates to the technical field of automation of air compressor equipment. The method comprises the steps that operation parameters and operation loads of a to-be-regulated four-stage compressor are collected; according to the operation parameters, the first-stage standard flow of the four-stage compressor to be regulated and controlled is determined, and according to the operation load, the load grade of the four-stage compressor to be regulated and controlled is determined; wherein the load grade comprises any one of a low load grade, a medium-low load grade, a medium-high load grade and a high load grade; according to the load grade of the four-stage compressor to be regulated and controlled, the surge critical value of the load grade is calculated through the operation parameters; and according to the first-stage standard flow and the surge critical value, an anti-surge control strategy of the to-be-regulated four-stage compressor under the load grade is determined. The surge phenomenon can be effectively avoided, and it is ensured that the compressor can stably operate under various load conditions.

Description

Four-stage compressor graded anti-surge control method, device, terminal and storage medium Technical Field

[0001] This application relates to the field of air compressor equipment automation technology, and in particular to a four-stage compressor graded anti-surge control method, device, terminal and storage medium. Background Technology

[0002] Surge is one of the most dangerous faults in the operation of a four-stage centrifugal compressor. Once the compressor's inlet flow rate falls below a critical value, the airflow will exhibit periodic reverse flow and pulsation inside the compressor. This will not only cause drastic fluctuations in the compressor outlet pressure and exacerbate the unit's vibration, but may also lead to serious equipment failures such as impeller wear and bearing damage, and may even cause production process interruption.

[0003] Current surge control technologies suffer from the following drawbacks: Traditional surge control methods mostly employ a "single cut-off point" or "fixed limit curve" control mode, failing to consider the impact of compression ratios, medium temperatures, and pressure coupling effects at each stage of a four-stage compression system on the surge boundary. Under varying load conditions (e.g., load fluctuations exceeding 30%) or changes in medium composition (e.g., medium molar mass fluctuations of ±5%), problems such as "over-surge control" (excessive backflow leading to energy waste) or "under-surge control" (failure to trigger protection in time, resulting in surge risk) are easily encountered. Existing control strategies largely rely on feedback from single parameters such as compressor outlet pressure and inlet flow rate, without establishing a correlation between inter-stage parameters (e.g., second-stage outlet pressure, third-stage inlet temperature) and surge risk. When signs of airflow instability appear in a stage, it is impossible to predict and intervene in advance, resulting in a lag in surge control (the lag time is usually greater than 0.5s), making it difficult to cope with rapid changes in operating conditions (e.g., a sudden drop in process load of 20% / min). Summary of the Invention

[0004] This application provides a four-stage compressor graded anti-surge control method, device, terminal and storage medium to solve the problem that the existing four-stage compressors have not established the correlation between inter-stage parameters and surge risk, making it difficult to cope with rapid changes in operating conditions.

[0005] In a first aspect, this application provides a graded anti-surge control method for a four-stage compressor, comprising: collecting operating parameters and operating load of the four-stage compressor to be controlled; determining the first-stage standard flow rate of the four-stage compressor to be controlled based on the operating parameters, and determining the load level of the four-stage compressor to be controlled based on the operating load; wherein the load level includes any one of low load level, medium-low load level, medium-high load level, and high load level; calculating the surge critical value of the load level using the operating parameters based on the load level of the four-stage compressor to be controlled; and determining the anti-surge control strategy of the four-stage compressor to be controlled under the load level based on the first-stage standard flow rate and the surge critical value.

[0006] Secondly, this application provides a four-stage compressor graded anti-surge control device, comprising: a data acquisition module for acquiring the operating parameters and operating load of the four-stage compressor to be controlled; a data determination module for determining the first-stage standard flow rate of the four-stage compressor to be controlled based on the operating parameters, and determining the load level of the four-stage compressor to be controlled based on the operating load; wherein the load level includes any one of low load level, medium-low load level, medium-high load level, and high load level; a critical value calculation module for calculating the surge critical value of the load level based on the load level of the four-stage compressor to be controlled using the operating parameters; and a strategy determination module for determining the anti-surge control strategy of the four-stage compressor to be controlled under the load level based on the first-stage standard flow rate and the surge critical value.

[0007] Thirdly, this application provides a terminal including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation of the first aspect above.

[0008] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation of the first aspect.

[0009] This application provides a four-stage compressor graded anti-surge control method, device, terminal, and storage medium. By collecting operating parameters and load, and calculating surge thresholds according to load levels, this application can accurately analyze the compressor's operating status under different load conditions. Because the compressor's operating characteristics differ significantly under different load levels, this graded processing method can more accurately grasp the surge boundary of the compressor at each load stage, thereby formulating a matching anti-surge control strategy to effectively avoid surge and ensure stable compressor operation under various load conditions. Furthermore, surge can cause severe mechanical damage to the compressor, such as blade breakage and bearing damage. The graded anti-surge control method of this application effectively prevents surge, reduces stress impact and fatigue damage to internal compressor components, thereby extending equipment lifespan and reducing maintenance costs and replacement frequency. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 is a flowchart illustrating the four-stage compressor graded anti-surge control method provided in this application embodiment; Figure 2 is a schematic diagram illustrating the deployment positions of various sensors provided in this application embodiment; Figure 3 is a structural schematic diagram of the four-stage compressor graded anti-surge control device provided in this application embodiment; Figure 4 is a schematic diagram of the terminal provided in this application embodiment. Detailed Implementation

[0012] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 1 is a schematic flowchart of the graded anti-surge control method for a four-stage compressor provided in the embodiment of this application, which is described in detail below: In step 101, the operating parameters and operating load of the four-stage compressor to be controlled are collected.

[0015] In this embodiment, various sensors deployed at key locations of the four-stage compressor to be regulated collect operating parameters to achieve comprehensive capture of operating parameters. Furthermore, by real-time monitoring of core indicators such as the operating output power and flow rate of the four-stage compressor to be regulated, and combining this with the equipment's rated load, the actual operating load of the four-stage compressor to be regulated is calculated.

[0016] The deployment locations of various sensors can be seen in Figure 2. Temperature sensor T1 and flow sensor F1 are installed at the first-stage inlet to collect the inlet temperature and real-time flow rate. Pressure sensors P1-P4 and temperature sensors T2-T5 are installed at the outlets of the first to fourth stages, respectively, to monitor the pressure and temperature data at each outlet in real time. Flow sensor F2 is installed at the fourth-stage outlet to collect outlet flow information. In addition, flow sensor F3 and valve opening sensor V1 are installed on the first return pipe, and flow sensor F4 and valve opening sensor V2 are installed on the combined return pipe of the second to fourth stages to obtain the return flow rate and the current valve opening status. It should be noted that the sensors shown in Figure 2 are not exhaustive and should be deployed according to actual needs.

[0017] In step 102, the first-stage standard flow rate of the four-stage compressor to be regulated is determined according to the operating parameters, and the load level of the four-stage compressor to be regulated is determined according to the operating load; wherein, the load level includes any one of the following levels: low load level, medium-low load level, medium-high load level, and high load level.

[0018] In this embodiment of the application, the operating parameters of the four-stage compressor to be controlled collected in step 101 are converted into the flow rate under standard conditions using the medium property model of the ideal gas equation of state. This can effectively eliminate the influence of medium temperature and pressure fluctuations on the accuracy of flow measurement and provide a unified standard parameter basis for subsequent calculations.

[0019] As shown in Figure 2, flow sensors are installed at both the first-stage inlet and the fourth-stage outlet. Therefore, when the operating parameters are the first-stage inlet flow rate, the first-stage inlet temperature, and the first-stage inlet pressure, the flow rate converted to standard conditions is recorded as the first-stage standard flow rate. When the operating parameters are the fourth-stage outlet flow rate, fourth-stage outlet temperature, and fourth-stage outlet pressure, the flow rate converted to standard conditions is recorded as the fourth-stage outlet standard flow rate. .

[0020] For example, using first-level standard traffic For example, the calculation formula is:

[0021] in, For the first-level standard flow, This is the first-level entry point traffic. The first-stage inlet temperature, For the first level of inlet pressure, The pressure under standard conditions, This refers to the temperature under standard conditions.

[0022] At the same time, the operating load of the four-stage compressor to be regulated is collected in step 101 to classify the load level of the four-stage compressor to be regulated.

[0023] In one possible implementation, determining the load level of the four-stage compressor to be controlled based on the operating load may include: obtaining the rated load of the four-stage compressor to be controlled; if the operating load is greater than 0 and less than or equal to a first rated load, then the load level of the four-stage compressor to be controlled is determined to be a low load level; wherein, the first rated load is the product of the rated load and a first percentage; if the operating load is greater than the first rated load and less than or equal to a second rated load, then the load level of the four-stage compressor to be controlled is determined to be a medium-low load level; wherein, the second rated load is the product of the rated load and a second percentage, and the second percentage is greater than the first percentage; if the operating load is greater than the second rated load and less than or equal to a third rated load, then the load level of the four-stage compressor to be controlled is determined to be a medium-high load level; wherein, the third rated load is the product of the rated load and a third percentage, and the third percentage is greater than the second percentage; if the operating load is greater than the third rated load and less than or equal to the rated load, then the load level of the four-stage compressor to be controlled is determined to be a high load level.

[0024] In this embodiment, the load level is based on the rated load of a four-stage compressor. Based on this, the operating load of the four-stage compressor is... It is divided into four distinct levels: low load level, low-medium load level, medium-high load level, and high load level. Among them, the rated load is the standard load value of the four-stage compressor under the design operating conditions, which can be extracted from the equipment technical manual, factory parameter configuration file, or equipment basic information stored in the real-time control system.

[0025] Optionally, the rated load of the four-stage compressor to be regulated is obtained. The first percentage is set at 25%, the second percentage at 50%, and the third percentage at 75%. Correspondingly, the first rated load is the product of the rated load and the first percentage, i.e. The second rated load is the product of the rated load and the second percentage, i.e. The third rated load is the product of the rated load and the third percentage, i.e. .

[0026] If the operating load of the fourth-stage compressor needs to be adjusted satisfy If so, the load level of the four-stage compressor to be controlled is determined to be low load level.

[0027] If the operating load of the fourth-stage compressor needs to be adjusted satisfy If so, the load level of the four-stage compressor to be controlled is determined to be a medium-low load level.

[0028] If the operating load of the fourth-stage compressor needs to be adjusted satisfy If so, the load level of the four-stage compressor to be controlled is determined to be medium-high load level.

[0029] If the operating load of the fourth-stage compressor needs to be adjusted satisfy If so, the load level of the four-stage compressor to be controlled is determined to be a high load level.

[0030] This application embodiment achieves precise classification of the operating load of a four-stage compressor through clear percentage and logical judgment rules, laying the foundation for the implementation of targeted anti-surge control strategies under different load levels.

[0031] In one possible implementation, before determining the first-stage standard flow rate of the four-stage compressor to be regulated based on the operating parameters, the method may further include: preprocessing the operating parameters and operating load, i.e., using a moving average filtering method, setting a filtering window width of 50ms, eliminating instantaneous interference signals in the parameters, and ensuring the stability of the operating parameters and operating load.

[0032] In step 103, the surge critical value of the load level is calculated using operating parameters based on the load level of the four-stage compressor to be controlled.

[0033] In this embodiment, the corresponding surge critical value is dynamically calculated based on the load level of the four-stage compressor to be regulated determined in step 102 and the operating parameters collected from the compressor. Specifically, when the load level of the four-stage compressor to be regulated is low load, the operating parameter required is the first-stage outlet pressure. (Unit: This parameter is acquired in real time by pressure sensor P1 located at the outlet of the first stage of the four-stage compressor to be regulated. The first stage standard flow rate is used. As the core parameter, the first-stage outlet pressure and rated load The value is input into the first formula to calculate the surge critical value of the four-stage compressor to be controlled at low load levels. ,Right now:

[0034] in, This refers to the surge critical value of the four-stage compressor to be controlled at low load levels, with units of: ; The rated load of the four-stage compressor to be adjusted is given in units of: ; This represents the first level of export pressure, expressed in units of: ; This is the first weighting factor for the load, in units of: It can take the value 015; The first weighting factor for pressure is expressed in units of: It can take the value 0.02.

[0035] The first formula in this application embodiment is obtained by fitting a large amount of experimental data based on the operating characteristics of a four-stage compressor under low load conditions. It can accurately reflect the influence of rated load and first-stage outlet pressure on the surge critical state under low load conditions.

[0036] When the load level of the four-stage compressor to be controlled is medium to low load, the required operating parameter is the second-stage outlet pressure. (Unit: ) and the third-stage inlet temperature (Unit: The second-stage outlet pressure is collected in real time by the pressure sensor P2 located at the second-stage outlet of the compressor to be regulated, and the third-stage inlet temperature... Temperature data was collected by the temperature sensor at the third-stage inlet (i.e., temperature sensor T3 at the second-stage outlet). The data was collected at the first-stage standard flow rate. As the core parameter, the second-stage export pressure Third-stage inlet temperature and rated load The input is used in the second formula to calculate the surge critical value of the four-stage compressor to be controlled at low and medium load levels. ,Right now:

[0037] in, This refers to the surge critical value of the four-stage compressor to be controlled at low to medium load levels, with units of: ; The rated load of the four-stage compressor to be adjusted is given in units of: ; This represents the second level of export pressure, in units of: ; This refers to the third-stage inlet temperature, in units of: ; This is the second weighting factor for the load, in units of: It can take the value 0.2; This is the second weighting factor for pressure, with units of: It can take the value 0.015; Temperature is the first weighting factor, with units of: It can take the value 0.005.

[0038] The second formula in this embodiment fully considers the promoting effect of the second-stage outlet pressure on surge and the suppressing effect of the third-stage inlet temperature on surge under medium and low load levels. It quantifies the influence of various parameters through weighting coefficients to ensure the accuracy of surge critical value calculation.

[0039] When the load level of the four-stage compressor to be controlled is medium-high load, the required operating parameter is the third-stage outlet pressure. (Unit: ), fourth-level inlet temperature (Unit: ), Level 4 export flow (Unit: ), fourth-stage outlet temperature (Unit: ) and Level 4 export pressure (Unit: Among them, the third level of export pressure. Level 4 export pressure The fourth-stage inlet temperature was collected by pressure sensors P3 and P4 at their respective locations. Fourth stage outlet temperature The fourth-stage outlet flow rate was collected by temperature sensors T4 and T5 at their respective locations. The data was collected by the flow sensor F2 at the fourth-level outlet.

[0040] First, we need to calculate the standard flow rate at the fourth-level outlet. The fourth level of export flow is about to be Fourth stage outlet temperature and fourth-level export pressure Enter the following formula to obtain the fourth-level standard outlet flow rate. ,Right now:

[0041] The embodiments of this application calculate the fourth-level outlet standard flow rate using the above formula, which can eliminate the influence of medium temperature and pressure fluctuations on flow measurement and ensure the comparability and accuracy of flow parameters.

[0042] Then use the first-level standard flow rate. Using the third-level export pressure as the core parameter Fourth-stage inlet temperature Level 4 export standard flow and rated load The input is used in the third formula to calculate the surge critical value of the four-stage compressor to be controlled at medium and high load levels. ,Right now:

[0043] in, This refers to the surge critical value of the four-stage compressor to be controlled at medium-high load levels, with units of: ; The rated load of the four-stage compressor to be adjusted is given in units of: ; This represents the third level of export pressure, expressed in units of: ; This is the fourth-stage inlet temperature, in units of: ; This is the fourth-level standard export flow rate, in units of: ; This is the third weighting factor for the load, with units of: It can take the value 0.3; This is the third weighting factor for pressure, with units of: It can take the value 0.01; This is the second weighting factor for temperature, with units of: It can take the value 0.003; This is the weighting coefficient for standard flow, a constant, and can take a value of 0.002.

[0044] The third formula in this application embodiment comprehensively considers the coupling effect of key parameters at all levels under medium and high load levels. By scientifically setting weight coefficients, it accurately describes the influence of different parameters on the surge critical state.

[0045] When the load level of the four-stage compressor to be controlled is high load, the required operating parameter is the fourth-stage outlet pressure. and medium molar mass (Unit: Among them, the fourth level of export pressure. The molar mass of the medium was collected by pressure sensor P4 at the fourth-stage outlet. This information is obtained through process design documents or monitored in real-time by online detection equipment. Similarly, using the first-stage standard flow rate as the core parameter, the fourth-stage outlet pressure is... Molar mass of the medium and rated load The value is input into the fourth formula to calculate the surge critical value of the four-stage compressor to be controlled at high load levels. ,Right now:

[0046] in, This refers to the surge critical value of the four-stage compressor to be controlled at high load levels, with units of: ; The rated load of the four-stage compressor to be adjusted is given in units of: ; This is the fourth level of export pressure, in units of: ; The molar mass of the medium is expressed in units of: ; This is the fourth weighting factor for the load, with units of: It can take the value 0.4; This is the fourth weighting factor for pressure, with units of: It can take the value 0.008; The weighting factor for the molar mass of the medium, in units of: It can take the value 0.001.

[0047] The fourth formula in this application embodiment addresses the characteristics of high operating pressure and significant influence of medium properties in a four-stage compressor under high load levels. By introducing the medium molar mass parameter and combining the rated load with the fourth-stage outlet pressure, it achieves precise quantification of the surge critical state.

[0048] In step 104, based on the first-level standard flow rate and surge threshold, the anti-surge control strategy for the four-stage compressor to be regulated under the load level is determined.

[0049] In this embodiment, the first-level standard flow rate calculated in step 102 and the surge threshold calculated in step 103 are used to determine the anti-surge control strategy for the four-stage compressor to be controlled under the load level. The anti-surge control strategy may include a warning stage control strategy and a critical stage control strategy. These two strategies correspond to different surge risk levels, and a graded response is achieved through precise threshold determination, ensuring the timeliness and rationality of the control.

[0050] This application comprehensively considers the compressor's operating parameters and load, performs graded calculations of surge thresholds, and formulates corresponding anti-surge control strategies, thus ensuring the compressor's operational safety from multiple dimensions. Whether under low or high load conditions, it can promptly detect potential surge risks and take effective control measures, avoiding safety accidents caused by surge and ensuring the safe and stable operation of the entire compression system.

[0051] In one possible implementation, the anti-surge control strategy for the four-stage compressor under load level is determined based on the first-level standard flow rate and the surge threshold. This can include: calculating a first threshold using the surge threshold; if the first-level standard flow rate is less than or equal to the first threshold, then determining the anti-surge control strategy for the four-stage compressor under load level as an early warning stage control strategy; if the first-level standard flow rate is greater than or equal to the surge threshold, then determining the anti-surge control strategy for the four-stage compressor under load level as a critical stage control strategy.

[0052] Optionally, since the first threshold is calculated based on the surge critical value of the corresponding load level, combined with the operating characteristics and anti-surge response requirements of that load level, the calculation of the first threshold uses the surge critical value as a benchmark, and superimposes a certain proportion of the surge critical value as a warning buffer. The proportional coefficient corresponding to different load levels is determined according to the adaptability of actual operating conditions. Specifically, if the fourth-stage compressor to be controlled is at a low load level, the corresponding surge critical value is... Then the first threshold is: .

[0053] If the fourth-stage compressor to be regulated is at a low to medium load level, the corresponding surge threshold value is Then the first threshold is: .

[0054] If the fourth-stage compressor to be regulated is at a medium-high load level, the corresponding surge threshold value is Then the first threshold is: .

[0055] If the fourth-stage compressor to be regulated is at a high load level, the corresponding surge threshold value is Then the first threshold is: .

[0056] Regarding the setting of the proportional coefficient for each load level, the embodiments of this application fully consider the anti-surge capability and operating stability of the four-stage compressor under different load levels. The operating condition fluctuation risk is higher at low load levels, so a higher warning buffer ratio (i.e., 5%) is set. The operating state is relatively stable at high load levels, so the warning buffer ratio is reduced to 1%, thereby achieving differentiation and precision in threshold setting.

[0057] Then, the first-level standard flow rate is compared with the corresponding first threshold. If the first-level standard flow rate is less than or equal to the first threshold, it is determined that the fourth-level compressor to be controlled currently has a potential surge risk, and its anti-surge control strategy under this load level is determined to be the early warning stage control strategy.

[0058] The early warning stage control strategy adheres to the core principle of "mild intervention and prevention." Through targeted parameter adjustments (such as fine-tuning the reflux valve opening, stabilizing interstage temperature / pressure, and minor adjustments to speed / load), it eliminates potential surge risks, maintains stable operation of the four-stage compressor, and prevents further escalation of risks. Referring to Figure 2, the early warning stage control strategy for different load levels is as follows: 1) At low load levels, the first-stage reflux valve V1 is opened, adjusted according to the opening coefficient. (Valve opening range 0-100%) Adjust the valve opening of the first-stage reflux valve V1, while simultaneously... The speed of the fourth-stage compressor to be regulated is reduced by a certain amount to ensure... .

[0059] 2) At medium and low load levels, adjust according to the opening degree adjustment coefficient. Adjust the valve opening of the first-stage reflux valve V1, and simultaneously reduce the inlet temperature of the third stage through the interstage cooler. Controlled Within the fluctuation range, maintain the second level of export pressure. Stablize.

[0060] 3) At medium to high load levels, the opening adjustment coefficient should be used first. Adjust the valve opening of the second-to-fourth stage combined reflux valve V2 to reduce the outlet pressure of the third stage. Fluctuation range controlled within Fourth stage inlet temperature Fluctuation range controlled within .

[0061] 4) At high load levels, the fourth-stage outlet pressure is controlled by the fourth-stage outlet throttle valve. Controlled Within the fluctuation range, and simultaneously based on the molar mass of the medium Corrected surge threshold That is, the molar mass of the medium Every change Surge threshold Correction .

[0062] The relationship between the first-level standard flow rate and the surge threshold value of the corresponding load level is continuously monitored. If the first-level standard flow rate is greater than or equal to the surge threshold value of the corresponding load level, it is determined that the fourth-level compressor to be controlled has approached or entered the surge state, and there is a serious risk of equipment damage. The anti-surge control strategy under this load level is determined to be the critical stage control strategy.

[0063] The critical stage control strategy is based on the core principle of "emergency intervention and rapid recovery from surge." This involves increasing the reflux adjustment range, rapidly adjusting core operating parameters (such as speed, load, and guide vane opening), and triggering interlocking protection when necessary to quickly escape the surge critical state and minimize equipment damage. The specific critical stage control strategies for different load levels are as follows: 1) At low load levels, trigger emergency reflux operation, increasing the opening of the first-stage reflux valve V1 to 80%, and simultaneously activating the second-to-fourth-stage combined reflux valve V2 (with an opening of 30%). The speed of the fourth-stage compressor to be controlled is reduced by a certain amount until... .

[0064] 2) At low to medium load levels, increase the opening of the first-stage return valve V1 to 60%, and the opening of the second-to-fourth-stage combined return valve V2 to 20%, in order to The load on the fourth-stage compressor to be regulated is reduced by a certain amount until... .

[0065] 3) At medium to high load levels, increase the opening of the second-to-fourth stage combined reflux valve V2 to 50%, increase the opening of the first stage reflux valve V1 to 40%, and reduce the opening of the compressor inlet guide vane by 10%, until... .

[0066] 4) At high load levels, increase the opening of the second-to-fourth stage combined reflux valve V2 to 70%, and the opening of the first stage reflux valve V1 to 30%, in order to The magnitude of the reduction in the load of the fourth-stage compressor to be regulated, if the fourth-stage outlet pressure If the temperature drops by more than 10%, the system's interlocking protection will be immediately triggered, cutting off the feed to the fourth-stage compressor to be controlled.

[0067] Furthermore, to adapt to changes in equipment characteristics during long-term operation, embodiments of this application can also collect operating parameters at various levels every 10 seconds and apply a PID algorithm (proportional coefficient). Integral time Differential time This involves correcting the surge threshold for each load level to eliminate the impact of equipment wear (such as impeller efficiency reduction) and media scaling. Simultaneously, an anti-surge vibration log is established to record parameter changes, control actions, and response effects for each warning / critical event. Machine learning algorithms (such as random forest models) are then used to optimize the adjustment coefficients for each load level. , , By adjusting the threshold correction range, the control strategy can be self-iteratively optimized, continuously improving the accuracy and adaptability of anti-surge control.

[0068] This application provides a four-stage compressor graded anti-surge control method. By collecting operating parameters and operating load, and calculating the surge critical value according to the load level, this application can accurately analyze the compressor's operating status under different load conditions. Because the operating characteristics of the compressor vary greatly under different load levels, this graded processing method can more accurately grasp the surge boundary of the compressor at each load stage, thereby formulating a matching anti-surge control strategy, effectively avoiding the occurrence of surge, and ensuring stable operation of the compressor under various load conditions. In addition, surge can cause serious mechanical damage to the compressor, such as blade breakage and bearing damage. The graded anti-surge control method of this application effectively prevents surge, reduces stress impact and fatigue damage to internal compressor components, thereby extending the service life of the equipment and reducing maintenance costs and replacement frequency.

[0069] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0070] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0071] Figure 3 shows a schematic diagram of the structure of the four-stage compressor graded anti-surge control device provided in the embodiment of this application. For ease of explanation, only the parts related to the embodiment of this application are shown, and the details are as follows: As shown in Figure 3, the four-stage compressor graded anti-surge control device 3 includes: a data acquisition module 31, used to acquire the operating parameters and operating load of the four-stage compressor to be controlled; a data determination module 32, used to determine the first-stage standard flow rate of the four-stage compressor to be controlled according to the operating parameters, and to determine the load level of the four-stage compressor to be controlled according to the operating load; wherein, the load level includes any one of low load level, medium-low load level, medium-high load level and high load level; a critical value calculation module 33, used to calculate the surge critical value of the load level using the operating parameters according to the load level of the four-stage compressor to be controlled; and a strategy determination module 34, used to determine the anti-surge control strategy of the four-stage compressor to be controlled under the load level according to the first-stage standard flow rate and the surge critical value.

[0072] This application provides a four-stage compressor graded anti-surge control device. By collecting operating parameters and operating load, and calculating the surge critical value according to the load level, this application can accurately analyze the compressor operating status under different load conditions. Because the operating characteristics of the compressor vary greatly under different load levels, this graded processing method can more accurately grasp the surge boundary of the compressor at each load stage, thereby formulating a matching anti-surge control strategy, effectively avoiding the occurrence of surge, and ensuring that the compressor can operate stably under various load conditions. In addition, surge can cause serious mechanical damage to the compressor, such as blade breakage and bearing damage. The graded anti-surge control method of this application effectively prevents the occurrence of surge, reduces stress impact and fatigue damage to internal compressor components, thereby extending the service life of the equipment and reducing the maintenance cost and replacement frequency.

[0073] In one possible implementation, the data determination module can be used to: obtain the rated load of the four-stage compressor to be controlled; if the operating load is greater than 0 and less than or equal to the first rated load, then determine the load level of the four-stage compressor to be controlled as a low load level; wherein, the first rated load is the product of the rated load and a first percentage; if the operating load is greater than the first rated load and less than or equal to the second rated load, then determine the load level of the four-stage compressor to be controlled as a medium-low load level; wherein, the second rated load is the product of the rated load and a second percentage, and the second percentage is greater than the first percentage; if the operating load is greater than the second rated load and less than or equal to the third rated load, then determine the load level of the four-stage compressor to be controlled as a medium-high load level; wherein, the third rated load is the product of the rated load and a third percentage, and the third percentage is greater than the second percentage; if the operating load is greater than the third rated load and less than or equal to the rated load, then determine the load level of the four-stage compressor to be controlled as a high load level.

[0074] In one possible implementation, the operating parameters include the first-stage outlet pressure; when the load level of the four-stage compressor to be regulated is a low-load level, the critical value calculation module can be used to: input the first-stage outlet pressure and the rated load of the four-stage compressor to be regulated into the first formula to obtain the surge critical value of the four-stage compressor to be regulated at the low-load level, the first formula being:

[0075] in, This refers to the surge critical value of the four-stage compressor to be adjusted at low load levels. The rated load of the four-stage compressor to be adjusted. This represents the first level of export pressure. The first weighting factor for the load is... This is the first weighting coefficient for pressure.

[0076] In one possible implementation, the operating parameters include the second-stage outlet pressure and the third-stage inlet temperature. When the load level of the four-stage compressor to be regulated is at a medium-low load level, the critical value calculation module can also be used to: input the second-stage outlet pressure, the third-stage inlet temperature, and the rated load of the four-stage compressor to be regulated into the second formula to obtain the surge critical value of the four-stage compressor to be regulated at the medium-low load level. The second formula is:

[0077] in, This refers to the surge critical value of the four-stage compressor to be adjusted at low to medium load levels. The rated load of the four-stage compressor to be adjusted. This represents the second level of export pressure. The third-stage inlet temperature, This is the second weighting factor for the load. The second weighting coefficient for pressure, This is the first weighting coefficient for temperature.

[0078] In one possible implementation, the operating parameters include the third-stage outlet pressure, the fourth-stage inlet temperature, the fourth-stage outlet flow rate, the fourth-stage outlet temperature, and the fourth-stage outlet pressure. When the load level of the four-stage compressor to be regulated is medium-high load, the critical value calculation module can also be used to: calculate the fourth-stage outlet standard flow rate using the fourth-stage outlet flow rate, the fourth-stage outlet temperature, and the fourth-stage outlet pressure; input the third-stage outlet pressure, the fourth-stage inlet temperature, the fourth-stage outlet standard flow rate, and the rated load of the four-stage compressor to be regulated into the third formula to obtain the surge critical value of the four-stage compressor to be regulated at the medium-high load level. The third formula is:

[0079] in, This refers to the surge critical value of the four-stage compressor to be regulated at medium-to-high load levels. The rated load of the four-stage compressor to be adjusted. This represents the third level of export pressure. The fourth inlet temperature, This is the fourth-level export standard flow rate. This is the third weighting factor for the load. The third weighting factor for pressure. The second weighting factor is temperature. This is the weighting coefficient for standard traffic.

[0080] In one possible implementation, the operating parameters include the fourth-stage outlet pressure and the molar mass of the medium. When the load level of the four-stage compressor to be regulated is a high-load level, the critical value calculation module can also be used to: input the fourth-stage outlet pressure, the molar mass of the medium, and the rated load of the four-stage compressor to be regulated into the fourth formula to obtain the surge critical value of the four-stage compressor to be regulated at the high-load level. The fourth formula is:

[0081] in, This refers to the surge critical value of the four-stage compressor to be adjusted at high load levels. The rated load of the four-stage compressor to be adjusted. This represents the fourth level of export pressure. The molar mass of the medium, This is the fourth weighting factor for the load. As the fourth weighting factor for pressure, This is the weighting coefficient for the molar mass of the medium.

[0082] In one possible implementation, the anti-surge control strategy includes a warning stage control strategy and a critical stage control strategy. Specifically, the strategy determination module can be used to: calculate a first threshold using the surge critical value; if the first-level standard flow is less than or equal to the first threshold, then determine the anti-surge control strategy of the four-stage compressor to be regulated under the load level as the warning stage control strategy; if the first-level standard flow is greater than or equal to the surge critical value, then determine the anti-surge control strategy of the four-stage compressor to be regulated under the load level as the critical stage control strategy.

[0083] Figure 4 is a schematic diagram of a terminal provided in an embodiment of this application. As shown in Figure 4, the terminal 4 of this embodiment includes: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, it implements the steps in the above-described embodiments of the four-stage compressor graded anti-surge control method, such as steps 101 to 104 shown in Figure 1. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module / unit in the above-described device embodiments, such as the functions of each module shown in Figure 3.

[0084] For example, the computer program 42 can be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 42 in the terminal 4. For example, the computer program 42 can be divided into the modules shown in FIG3.

[0085] The terminal 4 can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The terminal 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that Figure 4 is merely an example of the terminal 4 and does not constitute a limitation on the terminal 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0086] The processor 40 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0087] The memory 41 can be an internal storage unit of the terminal 4, such as a hard disk or memory of the terminal 4. The memory 41 can also be an external storage device of the terminal 4, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the terminal 4. Furthermore, the memory 41 can include both internal storage units and external storage devices of the terminal 4. The memory 41 is used to store the computer program and other programs and data required by the terminal. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0088] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0090] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0091] In the embodiments provided in this application, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0092] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0093] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0094] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-described embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various four-stage compressor graded anti-surge control method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0095] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A four-stage compressor graded anti-surge control method, characterized in that, include: Collect the operating parameters and operating load of the four-stage compressor to be controlled; Based on the operating parameters, the first-stage standard flow rate of the four-stage compressor to be regulated is determined, and based on the operating load, the load level of the four-stage compressor to be regulated is determined; wherein, the load level includes any one of low load level, medium-low load level, medium-high load level, and high load level; Based on the load level of the four-stage compressor to be regulated, the surge critical value of the load level is calculated using the operating parameters; based on the first-stage standard flow rate and the surge critical value, the anti-surge control strategy of the four-stage compressor to be regulated under the load level is determined.

2. The four-stage compressor graded anti-surge control method according to claim 1, characterized in that, The step of determining the load level of the four-stage compressor to be controlled based on the operating load includes: obtaining the rated load of the four-stage compressor to be controlled; if the operating load is greater than 0 and less than or equal to a first rated load, then the load level of the four-stage compressor to be controlled is determined to be the low load level; wherein, the first rated load is the product of the rated load and a first percentage; if the operating load is greater than the first rated load and less than or equal to a second rated load, then the load level of the four-stage compressor to be controlled is determined to be the medium-low load level; wherein, the second rated load is the product of the rated load and a second percentage, and the second percentage is greater than the first percentage; if the operating load is greater than the second rated load and less than or equal to a third rated load, then the load level of the four-stage compressor to be controlled is determined to be the medium-high load level; wherein, the third rated load is the product of the rated load and a third percentage, and the third percentage is greater than the second percentage; if the operating load is greater than the third rated load and less than or equal to the rated load, then the load level of the four-stage compressor to be controlled is determined to be the high load level.

3. The four-stage compressor graded anti-surge control method according to claim 2, characterized in that, The operating parameters include the first-stage outlet pressure; when the load level of the four-stage compressor to be regulated is the low-load level, the step of calculating the surge critical value of the load level using the operating parameters based on the load level of the four-stage compressor to be regulated includes: inputting the first-stage outlet pressure and the rated load of the four-stage compressor to be regulated into a first formula to obtain the surge critical value of the four-stage compressor to be regulated at the low-load level, wherein the first formula is: in, The surge threshold value of the four-stage compressor to be regulated at the low load level. The rated load of the four-stage compressor to be regulated is... This represents the first level of export pressure. The first weighting factor for the load is... This is the first weighting coefficient for pressure.

4. The four-stage compressor graded anti-surge control method according to claim 2, characterized in that, The operating parameters include the second-stage outlet pressure and the third-stage inlet temperature. When the load level of the four-stage compressor to be regulated is the medium-low load level, the calculation of the surge critical value of the load level using the operating parameters based on the load level of the four-stage compressor to be regulated includes: inputting the second-stage outlet pressure, the third-stage inlet temperature, and the rated load of the four-stage compressor to be regulated into a second formula to obtain the surge critical value of the four-stage compressor to be regulated at the medium-low load level. The second formula is: in, The surge critical value of the four-stage compressor to be regulated at the low to medium load level. The rated load of the four-stage compressor to be regulated is... This represents the second level of export pressure. The third-stage inlet temperature, The second weighting factor for the load. The second weighting coefficient for pressure, This is the first weighting coefficient for temperature.

5. The four-stage compressor graded anti-surge control method according to claim 2, characterized in that, The operating parameters include the third-stage outlet pressure, the fourth-stage inlet temperature, the fourth-stage outlet flow rate, the fourth-stage outlet temperature, and the fourth-stage outlet pressure. When the load level of the four-stage compressor to be regulated is the medium-high load level, the step of calculating the surge critical value of the load level using the operating parameters based on the load level of the four-stage compressor to be regulated includes: calculating the standard flow rate of the fourth stage outlet using the fourth stage outlet flow rate, the fourth stage outlet temperature, and the fourth stage outlet pressure; inputting the third stage outlet pressure, the fourth stage inlet temperature, the standard flow rate of the fourth stage outlet, and the rated load of the four-stage compressor to be regulated into a third formula to obtain the surge critical value of the four-stage compressor to be regulated at the medium-high load level, wherein the third formula is: in, This refers to the surge critical value of the four-stage compressor to be regulated at the medium-high load level. The rated load of the four-stage compressor to be regulated is... The third-stage outlet pressure, The fourth-stage inlet temperature, The fourth-level export standard flow rate, This is the third weighting factor for the load. The third weighting factor for pressure. The second weighting factor is temperature. This is the weighting coefficient for standard traffic.

6. The four-stage compressor graded anti-surge control method according to claim 2, characterized in that, The operating parameters include the fourth-stage outlet pressure and the molar mass of the medium; when the load level of the four-stage compressor to be regulated is the high load level, the calculation of the surge critical value of the load level using the operating parameters based on the load level of the four-stage compressor to be regulated includes: inputting the fourth-stage outlet pressure, the molar mass of the medium, and the rated load of the four-stage compressor to be regulated into a fourth formula to obtain the surge critical value of the four-stage compressor to be regulated at the high load level, wherein the fourth formula is: in, The surge threshold value of the four-stage compressor to be regulated at the high load level. The rated load of the four-stage compressor to be regulated is... For the fourth stage outlet pressure, The molar mass of the medium, This is the fourth weighting factor for the load. The fourth weighting factor for pressure. This is the weighting coefficient for the molar mass of the medium.

7. The four-stage compressor graded anti-surge control method according to claim 1, characterized in that, The anti-surge control strategy includes a warning stage control strategy and a critical stage control strategy. Determining the anti-surge control strategy for the four-stage compressor to be regulated under the load level based on the first-level standard flow rate and the surge critical value includes: calculating a first threshold using the surge critical value; if the first-level standard flow rate is less than or equal to the first threshold, then determining the anti-surge control strategy for the four-stage compressor to be regulated under the load level as the warning stage control strategy; if the first-level standard flow rate is greater than or equal to the surge critical value, then determining the anti-surge control strategy for the four-stage compressor to be regulated under the load level as the critical stage control strategy.

8. A four-stage compressor graded anti-surge control device, characterized in that, include: The data acquisition module is used to collect the operating parameters and operating load of the four-stage compressor to be controlled; The data determination module is used to determine the first-stage standard flow rate of the four-stage compressor to be regulated based on the operating parameters, and to determine the load level of the four-stage compressor to be regulated based on the operating load; wherein the load level includes any one of low load level, medium-low load level, medium-high load level, and high load level; the critical value calculation module is used to calculate the surge critical value of the load level based on the load level of the four-stage compressor to be regulated using the operating parameters; the strategy determination module is used to determine the anti-surge control strategy of the four-stage compressor to be regulated under the load level based on the first-stage standard flow rate and the surge critical value.

9. A terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the four-stage compressor graded anti-surge control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the four-stage compressor graded anti-surge control method as described in any one of claims 1 to 7.

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