Double-guide-vane adjustment control method based on eight-stage assembled centrifugal compressor

Abstract

This application provides a dual-guide vane adjustment control method for an eight-stage assembled centrifugal compressor, comprising the following steps: S1: setting inlet guide vanes at the inlet of the first-stage compressor and the inlet of the fifth-stage compressor, and configuring an independent pneumatic actuator for each inlet guide vane; S2: acquiring the inlet pressure of the first-stage compressor, the inlet flow rate of the first-stage compressor, the outlet pressure of the fourth-stage compressor, the inlet pressure of the fifth-stage compressor, the outlet flow rate of the eighth-stage compressor, and the outlet pressure of the eighth-stage compressor; the beneficial effect of this invention is that it can realize the performance adjustment of multi-stage assembled centrifugal compressors, achieve the flexibility of single-guide vane adjustment and the stability of dual-guide vane linkage adjustment, and effectively solve the problems of high difficulty and insufficient accuracy in multi-stage compressor adjustment.

Description

Technical Field

[0001] This application belongs to the field of compressor technology, specifically relating to a dual guide vane adjustment and control method for an eight-stage assembled centrifugal compressor. Background Technology

[0002] In the application of multi-stage assembled centrifugal compressors, to meet the demands of industrial production for higher pressure and flow rates, it is typically necessary to set up multiple rotor stages to gradually increase the gas pressure, generally from a single rotor to an eighth rotor. With each additional rotor stage, the gas compression pressure increases accordingly, thereby achieving the target pressure and flow rate output. However, as the number of rotor stages increases, especially with multi-stage configurations like eight stages, the performance adjustment difficulty of the compressor increases significantly. The performance adjustment problem of subsequent stages becomes a key bottleneck restricting the stable operation of the unit. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To address the aforementioned problems, this application provides a dual-guide vane adjustment and control method based on an eight-stage assembled centrifugal compressor, comprising the following steps: S1: Inlet guide vanes are installed at the inlet of the first-stage compressor and the inlet of the fifth-stage compressor, and an independent pneumatic actuator is configured for each inlet guide vane; S2: Obtain the inlet pressure of the first-stage compressor, the inlet flow rate of the first-stage compressor, the outlet pressure of the fourth-stage compressor, the inlet pressure of the fifth-stage compressor, the outlet flow rate of the eighth-stage compressor, and the outlet pressure of the eighth-stage compressor; S3: Based on the set value of the fourth-stage compressor outlet pressure, adjust the opening of the inlet guide vane of the first-stage compressor through the control function block to maintain the fourth-stage compressor outlet pressure within the set value range. S4: Based on the set value of the outlet pressure of the eighth-stage compressor, adjust the opening of the inlet guide vane of the fifth-stage compressor through the control function block to keep the outlet pressure of the eighth-stage compressor within the set value range. S5: When the outlet pressure of the eighth-stage compressor cannot reach the set value by adjusting the inlet guide vane of the fifth-stage compressor alone, the dual guide vane decoupling control module is activated. Based on the control of the inlet pressure of the first-stage compressor, the outlet pressure of the fourth-stage compressor, the inlet pressure of the fifth-stage compressor, the outlet pressure of the eighth-stage compressor, the inlet flow of the first-stage compressor, and the inlet flow of the eighth-stage compressor, the inlet guide vane of the first-stage compressor and the inlet guide vane of the fifth-stage compressor are adjusted in a coordinated manner. This ensures that the outlet pressure of the fourth-stage compressor meets the set value range while also ensuring that the outlet pressure of the eighth-stage compressor meets the set value range.

[0005] Optionally, the control function block in step S3 is internally configured with relevant parameter weights, PID control parameters, and compressor compression coefficient.

[0006] Optionally, the control function block in step S4 is internally configured with relevant parameter weights, PID control parameters, and compressor compression coefficient.

[0007] Optionally, start-up phase control is also included: during the compressor start-up and pressurization process, the inlet guide vanes of the first-stage compressor and the inlet guide vanes of the fifth-stage compressor are adjusted in a coordinated manner to ensure that the eight-stage assembled centrifugal compressor pressurizes steadily stage by stage.

[0008] Optionally, it also includes operation phase control: during the stable operation phase of the compressor, the control is achieved by linking the inlet guide vanes of the first-stage compressor and the inlet guide vanes of the fifth-stage compressor according to the user's changing needs for flow and pressure.

[0009] Optionally, it also includes shutdown phase control: during the compressor shutdown process, the opening of the inlet guide vanes of the first-stage compressor and the fifth-stage compressor is adjusted according to the preset shutdown phase guide vane opening setting value to ensure smooth shutdown.

[0010] Optionally, the eight-stage assembled centrifugal compressor is a CO2 assembled centrifugal compressor.

[0011] Optionally, the dual guide vane decoupling control module adopts a two-parameter decoupling control algorithm, which dynamically adjusts the opening ratio of the inlet guide vanes of the first-stage compressor and the inlet guide vanes of the fifth-stage compressor based on real-time feedback of the inlet pressure of the first-stage compressor, the outlet pressure of the fourth-stage compressor, the inlet pressure of the fifth-stage compressor, the outlet pressure of the eighth-stage compressor, the inlet flow rate of the first-stage compressor, and the outlet flow rate of the eighth-stage compressor.

[0012] Optionally, the pneumatic actuators of the inlet guide vanes of the first-stage compressor and the inlet guide vanes of the fifth-stage compressor receive control from the control function block and the decoupled control module, respectively, and drive the inlet guide vanes to rotate independently or in conjunction.

[0013] Optionally, both the control function block and the decoupling control module are located in an eight-stage assembled centrifugal compressor.

[0014] Beneficial effects The embodiment of the present invention provides a dual guide vane adjustment control method based on an eight-stage assembled centrifugal compressor, which can realize the performance adjustment of multi-stage assembled centrifugal compressors, achieve the flexibility of single guide vane adjustment and the stability of dual guide vane linkage adjustment, and effectively solve the problems of high adjustment difficulty and insufficient precision of multi-stage compressors. Attached Figure Description

[0015] Figure 1 This is a flowchart of the present invention; Figure 2 This is a structural diagram of the eight-stage assembled centrifugal compressor of the present invention.

[0016] The reference numerals in the attached figures are as follows: 1. Single-stage compressor; 2. Five-stage compressor; 3. Inlet guide vane; 4. Four-stage compressor; 5. Eight-stage compressor. Detailed Implementation

[0017] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] See also Figure 1-2 As shown, according to an embodiment of this application, a method for adjusting and controlling a dual guide vane of an eight-stage assembled centrifugal compressor is provided, comprising the following steps: S1: Inlet guide vanes 3 are installed at the inlet of the first-stage compressor 1 and the inlet of the fifth-stage compressor 2, and each inlet guide vane 3 is equipped with an independent pneumatic actuator.

[0022] In this technical solution, an inlet guide vane 3 is fixedly installed at the inlet of the first-stage compressor 1 and the inlet of the fifth-stage compressor 2, respectively. These vanes are used to adjust the intake volume of the first-stage compressor 1 and the fifth-stage compressor 2, thereby controlling the compression performance of the corresponding stages and subsequent stages. Each inlet guide vane 3 is equipped with an independent pneumatic actuator, which is connected to the inlet guide vane 3 via a transmission mechanism. This actuator receives control signals and drives the corresponding inlet guide vane 3 to rotate around its own axis, thus adjusting the opening degree of the inlet guide vane 3.

[0023] S2: Obtain the inlet pressure of stage 1 compressor 1, the inlet flow rate of stage 1 compressor 1, the outlet pressure of stage 4 compressor 4, the inlet pressure of stage 5 compressor 2, the outlet flow rate of stage 8 compressor 5, and the outlet pressure of stage 8 compressor 5.

[0024] In this technical solution, during unit operation, the inlet pressure and inlet flow of the first-stage compressor 1, the outlet pressure of the fourth-stage compressor 4, the inlet pressure of the fifth-stage compressor 2, and the outlet flow and outlet pressure of the eighth-stage compressor 5 are collected in real time using preset pressure and flow sensors. All collected parameters are transmitted to the unit's control unit in real time.

[0025] S3: Based on the set value of the outlet pressure of the fourth-stage compressor 4, adjust the opening of the inlet guide vane 3 of the first-stage compressor 1 through the control function block to keep the outlet pressure of the fourth-stage compressor 4 within the set value range.

[0026] In this technical solution, a preset range for the outlet pressure of the four-stage compressor 4 is pre-set in the control unit. The control unit compares and analyzes the real-time collected outlet pressure of the four-stage compressor 4 with the preset range. Based on the comparison results, the control unit generates adjustment commands through its built-in control function block. These commands are then transmitted via the pneumatic actuator corresponding to the inlet guide vane 3 of the first-stage compressor 1, which drives the inlet guide vane 3 to rotate, adjusting its opening. When the outlet pressure of the four-stage compressor 4 is lower than the preset lower limit, the opening of the inlet guide vane 3 is increased, increasing the intake air volume of the first-stage compressor 1, thereby increasing the compression pressure of subsequent stages and raising the outlet pressure of the four-stage compressor 4 to within the preset range. Conversely, when the outlet pressure of the four-stage compressor 4 is higher than the preset upper limit, the opening of the inlet guide vane 3 of the first-stage compressor 1 is decreased, reducing the intake air volume and lowering the outlet pressure of the four-stage compressor 4 to within the preset range, ultimately maintaining the outlet pressure of the four-stage compressor 4 within the set range.

[0027] S4: Based on the set value of the outlet pressure of the eight-stage compressor 5, adjust the opening of the inlet guide vane 3 of the five-stage compressor 2 through the control function block to maintain the outlet pressure of the eight-stage compressor 5 within the set value range.

[0028] In this technical solution, a preset range of outlet pressure for the eight-stage compressor 5 is pre-set in the control unit. The control unit compares and analyzes the real-time collected outlet pressure of the eight-stage compressor 5 with the preset range. Based on the comparison results, the control unit generates an adjustment command through its built-in control function block and sends it to the pneumatic actuator corresponding to the inlet guide vane 3 of the five-stage compressor 2. The pneumatic actuator drives the inlet guide vane 3 of the five-stage compressor 2 to rotate, adjusting its opening degree. This ensures that the outlet pressure of the eight-stage compressor 5 is maintained within the set range.

[0029] S5: When the outlet pressure of the eighth-stage compressor 5 cannot reach the set value by adjusting the inlet guide vane 3 of the fifth-stage compressor 2 alone, the dual guide vane decoupling control module is activated. Based on the control of the inlet pressure of the first-stage compressor 1, the outlet pressure of the fourth-stage compressor 4, the inlet pressure of the fifth-stage compressor 2, the outlet pressure of the eighth-stage compressor 5, the inlet flow of the first-stage compressor 1, and the inlet flow of the eighth-stage compressor 5, the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 are adjusted in a coordinated manner. While ensuring that the outlet pressure of the fourth-stage compressor 4 meets the set value range, the outlet pressure of the eighth-stage compressor 5 also meets the set value range.

[0030] In this technical solution, during unit operation, the control unit continuously determines whether the outlet pressure of the eighth-stage compressor 5 can reach the preset value range through the individual adjustment of the inlet guide vane 3 of the fifth-stage compressor 2. When the control unit detects that even if the opening of the inlet guide vane 3 of the fifth-stage compressor 2 is adjusted to the maximum or minimum position, the outlet pressure of the eighth-stage compressor 5 still cannot reach the preset value range, the control unit activates the built-in dual guide vane decoupling control module. After the dual guide vane decoupling control module is activated, it synchronously acquires all the control parameters collected in step S2, including the inlet pressure of the first-stage compressor 1, the outlet pressure of the fourth-stage compressor 4, the inlet pressure of the fifth-stage compressor 2, the outlet pressure of the eighth-stage compressor 5, the inlet flow rate of the first-stage compressor 1, and the outlet flow rate of the eighth-stage compressor 5. These parameters are used as the linkage control input parameters to perform decoupling calculations, eliminating the mutual interference between the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 during the adjustment process.

[0031] Based on the calculation results, the dual-guide vane decoupling control module simultaneously generates two independent adjustment commands, which are sent to the pneumatic actuators corresponding to the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2, respectively, to synchronously adjust the opening of the two inlet guide vanes 3. During the adjustment process, the opening ratio of the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 is dynamically adjusted, always under the premise that the outlet pressure of the fourth-stage compressor 4 is maintained within the preset value range, until the outlet pressure of the eighth-stage compressor 5 reaches the preset value range, completing the linkage adjustment.

[0032] By implementing the above steps, the performance of multi-stage assembled centrifugal compressors can be adjusted, achieving the flexibility of single guide vane adjustment and the stability of double guide vane linkage adjustment, effectively solving the problems of high adjustment difficulty and insufficient precision of multi-stage compressors.

[0033] In some feasible embodiments, the control function block in step S3 is internally configured with relevant parameter weights, PID control parameters, and compressor compression coefficient.

[0034] The control function block described in step S4 contains relevant parameter weights, PID control parameters, and compressor compression coefficients.

[0035] In this technical solution, the control unit inputs the real-time collected inlet pressure of the first-stage compressor 1, inlet flow rate of the first-stage compressor 1, and outlet pressure of the fourth-stage compressor 4 into the control function block. The control function block combines the preset parameter weights, PID control parameters, and compressor compression coefficients to generate adjustment commands through internal logic operations. These commands are then sent to the pneumatic actuator corresponding to the inlet guide vane 3 of the first-stage compressor 1, driving the inlet guide vane 3 of the first-stage compressor 1 to rotate and adjust the opening, ultimately achieving the goal of maintaining the outlet pressure of the fourth-stage compressor 4 within the set value range.

[0036] The control unit inputs the real-time collected inlet pressure of the five-stage compressor 2, outlet flow rate of the eight-stage compressor 5, and outlet pressure of the eight-stage compressor 5 into the control function block. Based on the preset parameter weights, PID control parameters, and compressor compression coefficient, the control function block generates adjustment commands through internal logic operations and sends them to the pneumatic actuator corresponding to the inlet guide vane 3 of the five-stage compressor 2. This drives the inlet guide vane 3 of the five-stage compressor 2 to rotate and adjust the opening, thereby maintaining the outlet pressure of the eight-stage compressor 5 within the set value range.

[0037] In some feasible embodiments, start-up phase control is also included: during the compressor start-up and pressurization process, the inlet guide vanes 3 of the first-stage compressor 1 and the inlet guide vanes 3 of the fifth-stage compressor 2 are adjusted in a coordinated manner to enable the eight-stage assembled centrifugal compressor to pressurize steadily stage by stage.

[0038] In this technical solution, after startup, the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 are linked and adjusted through the dual guide vane decoupling control module. The pressure rise rate is dynamically fine-tuned to avoid abnormalities such as surge and pressure change, ensuring smooth start-up of the unit and preventing CO2 gas from entering the supercritical liquid phase state.

[0039] In some feasible embodiments, operation phase control is also included: during the stable operation phase of the compressor, the control is achieved by linking the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 according to the user's changing needs for flow and pressure.

[0040] In this technical solution, when the unit is running stably, the control unit continuously monitors parameters at all levels and user adjustment commands to determine the adjustment mode: it can adjust the inlet guide vane 3 of the first-stage compressor 1 or the inlet guide vane 3 of the fifth-stage compressor 2 to achieve small pressure fine-tuning. When large adjustments are required or individual adjustments cannot meet the needs, the dual guide vane decoupling control module is activated to perform linkage control of the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2. Combined with the preset parameters of the control function block, it ensures smooth adjustment, maintains the CO2 gas state, and ensures stable operation of the unit under different operating conditions.

[0041] In some feasible embodiments, a shutdown phase control is also included: during the compressor shutdown process, the opening of the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 is adjusted according to the preset shutdown phase guide vane opening setting value to ensure smooth shutdown.

[0042] In this technical solution, after receiving a shutdown command, the unit gradually reduces the opening of the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 according to the preset shutdown stage guide vane opening value in the initial, middle and final stages. During the adjustment process, the parameters are monitored in real time and dynamically fine-tuned. After the unit stops, the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 are restored to the closed state to ensure shutdown safety.

[0043] In some feasible embodiments, the eight-stage assembled centrifugal compressor is a CO2 assembled centrifugal compressor.

[0044] In some feasible embodiments, the dual guide vane decoupling control module adopts a dual-parameter decoupling control algorithm, which dynamically adjusts the opening ratio of the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 based on the real-time feedback of the inlet pressure of the first-stage compressor 1, the outlet pressure of the fourth-stage compressor 4, the inlet pressure of the fifth-stage compressor 2, the outlet pressure of the eighth-stage compressor 5, the inlet flow rate of the first-stage compressor 1, and the outlet flow rate of the eighth-stage compressor 5.

[0045] In this technical solution, the dual-guide vane decoupling control module is pre-connected to the unit control unit and collects real-time feedback parameters. These parameters specifically include: inlet pressure of stage 1 compressor 1, outlet pressure of stage 4 compressor 4, inlet pressure of stage 5 compressor 2, outlet pressure of stage 8 compressor 5, inlet flow rate of stage 1 compressor 1, and outlet flow rate of stage 8 compressor 5. All these parameters are collected in real-time by pressure and flow sensors pre-set by the unit, and the collected data is synchronously transmitted to the dual-guide vane decoupling control module to ensure the real-time performance and accuracy of the parameter feedback. The dual-guide vane decoupling control module incorporates a dual-parameter decoupling control algorithm. During the algorithm's operation, the algorithm first normalizes the collected real-time parameters to eliminate dimensional differences between different parameters and avoid calculation deviations caused by parameter numerical differences. Subsequently, it decouples the normalized parameters using a decoupling matrix to separate the mutual interference during the adjustment of the inlet guide vane 3 of stage 1 compressor 1 and the inlet guide vane 3 of stage 5 compressor 2, clarifying the correlation between the opening adjustments of the two guide vanes. Combined with preset pressure and flow target values, the theoretical opening ratio of the two guide vanes is calculated. The dual-guide vane decoupling control module generates corresponding adjustment commands based on the theoretical opening ratio calculated by the algorithm. These commands are sent to the pneumatic actuators corresponding to the inlet guide vanes 3 of the first-stage compressor 1 and the fifth-stage compressor 2, respectively. This dynamically adjusts the opening of the inlet guide vanes 3 of both compressors, ensuring that their openings remain within a suitable proportional range. Simultaneously, the algorithm receives feedback data from various parameters in real time and continuously performs fine-tuning. When a parameter fluctuates, the opening ratio of the two inlet guide vanes 3 is adjusted promptly to ensure that the outlet pressure of the fourth-stage compressor 4 and the outlet pressure of the eighth-stage compressor 5 remain within the preset range.

[0046] In some feasible embodiments, the pneumatic actuators of the inlet guide vane 3 of the first-stage compressor 1 and the inlet guide vane 3 of the fifth-stage compressor 2 respectively receive control from the control function block and the decoupled control module, and drive the inlet guide vane 3 to rotate independently or in conjunction.

[0047] In some feasible embodiments, both the control function block and the decoupling control module are located in an eight-stage assembled centrifugal compressor.

[0048] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor, characterized in that, Includes the following steps: S1: Inlet guide vanes (3) are set at the inlet of the first-stage compressor (1) and the inlet of the fifth-stage compressor (2), and an independent pneumatic actuator is configured for each inlet guide vane (3); S2: Obtain the inlet pressure of the first-stage compressor (1), the inlet flow rate of the first-stage compressor (1), the outlet pressure of the fourth-stage compressor (4), the inlet pressure of the fifth-stage compressor (2), the outlet flow rate of the eighth-stage compressor (5), and the outlet pressure of the eighth-stage compressor (5); S3: Based on the set value of the outlet pressure of the fourth-stage compressor (4), the opening of the inlet guide vane (3) of the first-stage compressor (1) is adjusted by the control function block so that the outlet pressure of the fourth-stage compressor (4) is maintained within the set value range. S4: Based on the set value of the outlet pressure of the eight-stage compressor (5), adjust the opening of the inlet guide vane (3) of the five-stage compressor (2) through the control function block so that the outlet pressure of the eight-stage compressor (5) is maintained within the set value range. S5: When the outlet pressure of the eighth-stage compressor (5) cannot reach the set value by adjusting the inlet guide vane (3) of the fifth-stage compressor (2) alone, the dual guide vane decoupling control module is activated. Based on the control of the inlet pressure of the first-stage compressor (1), the outlet pressure of the fourth-stage compressor (4), the inlet pressure of the fifth-stage compressor (2), the outlet pressure of the eighth-stage compressor (5), the inlet flow of the first-stage compressor (1), and the inlet flow of the eighth-stage compressor (5), the inlet guide vane (3) of the first-stage compressor (1) and the inlet guide vane (3) of the fifth-stage compressor (2) are adjusted in a coordinated manner. While ensuring that the outlet pressure of the fourth-stage compressor (4) meets the set value range, the outlet pressure of the eighth-stage compressor (5) also meets the set value range.

2. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 1, characterized in that, The control function block described in step S3 has relevant parameter weights, PID control parameters, and compressor compression coefficients set internally.

3. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 2, characterized in that, The control function block described in step S4 contains relevant parameter weights, PID control parameters, and compressor compression coefficients.

4. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 3, characterized in that, It also includes start-up stage control: during the compressor start-up and pressurization process, the inlet guide vane (3) of the first-stage compressor (1) and the inlet guide vane (3) of the fifth-stage compressor (2) are adjusted in a coordinated manner to make the eight-stage assembled centrifugal compressor pressurize steadily step by step.

5. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 4, characterized in that, It also includes operation phase control: during the stable operation phase of the compressor, the control is achieved by linking the inlet guide vane (3) of the first-stage compressor (1) and the inlet guide vane (3) of the fifth-stage compressor (2) according to the user's demand for changes in flow and pressure.

6. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 1, characterized in that, It also includes shutdown stage control: during the compressor shutdown process, the opening of the inlet guide vane (3) of the first-stage compressor (1) and the inlet guide vane (3) of the fifth-stage compressor (2) is adjusted according to the preset shutdown stage guide vane opening setting value to ensure smooth shutdown.

7. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 1, characterized in that, The eight-stage assembled centrifugal compressor is a CO2 assembled centrifugal compressor.

8. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 1, characterized in that, The dual guide vane decoupling control module adopts a dual-parameter decoupling control algorithm. Based on the real-time feedback of the inlet pressure of the first-stage compressor (1), the outlet pressure of the fourth-stage compressor (4), the inlet pressure of the fifth-stage compressor (2), the outlet pressure of the eighth-stage compressor (5), the inlet flow rate of the first-stage compressor (1), and the outlet flow rate of the eighth-stage compressor (5), the opening ratio of the inlet guide vane (3) of the first-stage compressor (1) and the inlet guide vane (3) of the fifth-stage compressor (2) is dynamically adjusted.

9. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 1, characterized in that, The pneumatic actuators of the inlet guide vane (3) of the first-stage compressor (1) and the inlet guide vane (3) of the fifth-stage compressor (2) respectively receive control from the control function block and the decoupled control module, and drive the inlet guide vane (3) to rotate independently or in conjunction.

10. The method for adjusting and controlling the dual guide vanes of an eight-stage assembled centrifugal compressor according to claim 1, characterized in that, Both the control function block and the decoupling control module are located in the eight-stage assembled centrifugal compressor.

Images