Compressor control device, compressor control method, and compressor control program

Abstract

To suppress the lowering of efficiency even if a compressor inlet temperature is lowered.SOLUTION: A compressor control device comprises an inlet guide vane arranged at an inlet part of a compressor, a variable stator blade arranged at a downstream side of the inlet guide vane, a moving blade arranged between the inlet guide vane and the variable stator blade, a first actuator for adjusting a first opening of the inlet guide vane, a second actuator for adjusting a second opening of the variable stator blade, a compressor inlet temperature detection part for detecting a compressor inlet temperature at the inlet part, and a control part for controlling the first actuator and the second actuator. When the compressor inlet temperature is lower than a threshold, the control part controls the first actuator and the second actuator so that an opening ratio of the first opening with respect to the second opening is increased as the compressor inlet temperature is lowered.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a compressor control device, a compressor control method, and a compressor control program. Regarding. [Background technology]

[0002] There is known a compressor for generating compressed gas to be supplied to equipment such as a gas turbine or an internal combustion engine. In the compressor, for example, intake air is taken in through an inlet guide vane (IGV) provided at the inlet, and compressed gas is generated by rotor blades and stator vanes arranged in multiple stages downstream of the inlet guide vane.

[0003] In this type of compressor, the opening of the inlet guide vanes or stator vanes may be configured to be variable, thereby controlling the opening according to the load on the compressor. For example, Patent Document 1 discloses a control technology that evaluates the load on each stage and uses an actuator to adjust the opening of the stator vanes (variable stator vanes) in stages with high loads, thereby averaging the load on each stage. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-61594 Summary of the Invention [Problem to be solved by the invention]

[0005] In a compressor capable of controlling the opening of the inlet guide vanes and stator vanes as described above, if the compressor inlet temperature (intake air temperature) drops, for example, due to cold climates or climate change, the density of the intake air taken into the compressor increases. In this case, it is possible to reduce the opening of the inlet guide vanes to prevent an excessive supply of compressed gas to the compressor's supply destination, thereby suppressing the amount of intake air taken into the compressor. However, reducing the opening of the inlet guide vanes reduces the load on the rotor blades downstream of the inlet guide vanes, thereby reducing the temperature of the air supplied to the stator vanes further downstream of the rotor blades. This increases the flow velocity (Mach number) supplied to the stator vanes, increasing losses and reducing the compressor's efficiency.

[0006] At least one embodiment of the present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a compressor control device, a compressor control method, and a compressor control program that can suppress a decrease in efficiency even when the compressor inlet temperature drops. [Means for solving the problem]

[0007] In order to solve the above problem, a compressor control device according to at least one embodiment of the present disclosure includes: an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; a compressor inlet temperature detection unit for detecting a compressor inlet temperature at the inlet portion; a control unit for controlling the first actuator and the second actuator; Equipped with When the compressor inlet temperature is less than a threshold value, the control unit controls the first actuator and the second actuator so that the opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases.

[0008] In order to solve the above problem, a compressor control method according to at least one embodiment of the present disclosure includes: an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; A method for controlling a compressor comprising: detecting a compressor inlet temperature at the inlet section; When the compressor inlet temperature is less than a threshold value, controlling the first actuator and the second actuator so that an opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases. Equipped with.

[0009] In order to solve the above problem, a control program for a compressor according to at least one embodiment of the present disclosure includes: an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; A control program for a compressor comprising: On the computer, detecting a compressor inlet temperature at the inlet section; When the compressor inlet temperature is less than a threshold value, controlling the first actuator and the second actuator so that an opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases. is possible. [Effects of the Invention]

[0010] According to at least one embodiment of the present disclosure, it is possible to provide a compressor control device, a compressor control method, and a compressor control program that can suppress a decrease in efficiency even when the compressor inlet temperature drops. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view schematically illustrating a configuration of a compressor according to an embodiment. [Figure 2] FIG. 2 is a block diagram showing the internal configuration of the control device of FIG. [Figure 3] 10 is a diagram showing an example of control of the opening ratio between the first opening and the second opening, and the absolute value of the compressor inlet temperature according to the reference technology. [Figure 4] FIG. 4 is a schematic diagram illustrating the inlet guide vanes, the rotor blades, and the variable stator vanes in FIG. 3. [Figure 5] 10 is a diagram illustrating an example of control of the opening ratio between the first opening and the second opening, and the absolute value of the compressor inlet temperature according to one embodiment. [Figure 6] FIG. 6 is a schematic diagram illustrating the inlet guide vanes, the rotor blades, and the variable stator vanes in FIG. 5. [Figure 7] 10 shows an example of control of the opening ratio between the first opening and the second opening, and the absolute value of the compressor inlet temperature when the load on the compressor 1 is partial. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the configurations described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0013] 1 is a cross-sectional view showing a schematic configuration of a compressor 1 according to one embodiment. The compressor 1 is an axial flow compressor that generates compressed gas by compressing gas (e.g., air) taken in from the outside and can supply the compressed gas to other downstream equipment (e.g., a gas turbine or an internal combustion engine).

[0014] The compressor 1 includes a casing 2. A compressor inlet section 4 for taking in intake air is provided on the upstream side of the casing 2. A plurality of struts 6 are provided around the periphery of the compressor inlet section 4, and an inlet guide vane 8 is provided downstream thereof.

[0015] The inlet guide vane 8 is a variable vane whose opening (first opening D1) can be varied by changing its blade angle. The first opening D1 can be adjusted by changing the blade angle using a first actuator 10 connected to the inlet guide vane 8. The operation of the first actuator 10 is controlled based on commands from a control device 100, which will be described later.

[0016] Downstream of the inlet guide vane 8, blades for compressing the intake air taken in from the compressor inlet section 4 are provided in multiple stages. These blades include a plurality of moving blades 1S to 6S provided on a rotating shaft 13 rotatably housed in the casing 2, and a plurality of stator vanes 1C to 6C provided on the inner surface of the casing 2, and these moving blades 1S to 6S and stator vanes 1C to 6C are arranged alternately along the axial direction of the rotating shaft 13. That is, in each blade arrangement, moving blade 1S and stator vane 1C are arranged in the first stage, moving blade 2S and stator vane 2C are arranged in the second stage, and moving blades 3S to 6S and stator vanes 3C to 6C are arranged in the same manner, thereby forming a six-stage compressor. Although FIG. 1 illustrates an example in which the compressor has six stages, the number of stages is not limited.

[0017] The stator vane C1 is a variable stator vane whose opening (second opening D2) can be varied by changing its blade angle. The second opening D2 can be adjusted by changing the blade angle using a second actuator 12 connected to the stator vane C1. The operation of the second actuator 12 is controlled based on commands from a control device 100, which will be described later.

[0018] In the following description, attention is focused on the stator vane C1 among the stator vanes C1 to C6, but if the other stator vanes C2 to C6 are also configured as variable stator vanes, the configuration related to the stator vane C1 can also be applied to the stator vanes C2 to C6. Furthermore, the openings (second opening D2) of the stator vanes C1 to C6 may be adjustable independently of each other, or may be adjustable in conjunction with each other by, for example, a link mechanism (not shown).

[0019] The compressor 1 configured as described above is provided with a temperature sensor 14 for detecting the compressor inlet temperature T1C. The temperature sensor 14 is installed in the compressor inlet section 4, and in FIG. 1, it is installed on the inner surface of the casing 2, between the strut 6 and the inlet guide vane 8. Since the compressor inlet temperature T1C is approximately equal to the outside air temperature, the temperature sensor 14 may be disposed at a position where it can detect the outside air temperature.

[0020] The compressor 1 includes a control device 100 (compressor control device) for controlling the compressor 1. The control device 100 is configured with, for example, a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), and a computer-readable storage medium. A series of processes for implementing various functions is stored in a storage medium or the like in the form of a program, for example. The CPU reads the program into the RAM or the like and executes information processing and arithmetic operations to implement various functions. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Examples of computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories.

[0021] Fig. 2 is a block diagram showing the internal configuration of the control device 100 of Fig. 1. The control device 100 includes a compressor inlet temperature detection unit 110 and a control unit 120.

[0022] The compressor inlet temperature detection unit 110 is configured to detect the compressor inlet temperature T1C. Specifically, the compressor inlet temperature detection unit 110 detects the compressor inlet temperature T1C by acquiring a detection signal from the temperature sensor 14 described above.

[0023] The control unit 120 is configured to control the first actuator 10 and the second actuator 12 based on the compressor inlet temperature T1C detected by the compressor inlet temperature detection unit 110. In other words, by controlling the first actuator 10 and the second actuator 12 with the control unit 120, the first opening D1 of the inlet guide vane 8 and the second opening D2 of the variable stator vane 1C can be adjusted.

[0024] For example, in the compressor 1, when the compressor inlet temperature T1C drops due to cold regions or climate change, the density of the intake air taken into the compressor 1 increases. In this case, it is possible to reduce at least one of the inlet guide vanes 8 or the variable stator vanes 1C so that the amount of compressed gas supplied to the destination of the compressor 1 does not become excessive. Here, as a reference technique, a case will be considered in which the second opening D2 of the variable stator vanes 1C is kept substantially constant, while the first opening D1 of the inlet guide vanes 8 is controlled to decrease as the compressor inlet temperature T1C decreases (i.e., a case in which the opening ratio D1 / D2 of the first opening D1 to the second opening D2 is controlled to decrease).

[0025] Fig. 3 shows an example of control of the opening ratio D1 / D2 between the first opening D1 and the second opening D2 and the absolute values ​​D1, D2 relative to the compressor inlet temperature T1C according to the reference technology, and Fig. 4 is a schematic diagram showing the inlet guide vanes 8, rotor blades 1S, and variable stator vanes 1C in Fig. 3. In Figs. 3 and 4, it is assumed that the load (output) of the compressor 1 is maintained constant at the rated load (rated output), and Fig. 4 shows a schematic diagram of the inlet guide vanes 8, rotor blades 1S, and variable stator vanes 1C extracted from the configuration of the compressor 1 shown in Fig. 1.

[0026] In this reference technique, in a temperature range in which the compressor inlet temperature T1C is equal to or higher than a threshold value Tth, as shown in Fig. 3, the first opening D1 of the inlet guide vane 8 and the second opening D2 of the variable stator vane 1C are maintained substantially constant at openings D1a and D2a, respectively, which correspond to the load of the compressor 1. More specifically, the control unit 120 controls the opening ratio D1 / D2 in accordance with the load of the compressor 1, using the opening ratio D1 / D2 of the first opening D1 to the second opening D2 as a control parameter. In this embodiment, since the load (output) of the compressor 1 is maintained constant at the rated load (rated output), the first opening D1a and the second opening D2a are each determined to be the opening ratio D1 / D2 corresponding to the rated load.

[0027] On the other hand, in a temperature range where the compressor inlet temperature T1C is less than the threshold value Tth, the second opening D2 of the variable stator vane 1C is maintained substantially constant at opening D2a relative to the compressor inlet temperature T1C, while the first opening D1 of the inlet guide vane 8 is reduced from opening D1a as the compressor inlet temperature T1C decreases, thereby controlling the opening ratio D1 / D2 to decrease. When the first opening D1 of the inlet guide vane 8 decreases in this manner, as shown in FIG. 4, the load on the rotor blade 1S downstream of the inlet guide vane 8 decreases, and the temperature of the air supplied to the variable stator vane 1C further downstream of the rotor blade 1S decreases. This increases the flow velocity (Mach number) supplied to the variable stator vane 1C, increasing losses and reducing the efficiency of the compressor 1. This problem is solved effectively by the embodiment described below.

[0028] Fig. 5 shows an example of control of the opening ratio D1 / D2 between the first opening D1 and the second opening D2 and the absolute values ​​D1, D2 relative to the compressor inlet temperature T1C according to one embodiment, and Fig. 6 is a schematic diagram showing the inlet guide vane 8, the rotor blades 1S, and the variable stator vanes 1C in Fig. 5. As with Figs. 3 and 4 described above, Figs. 5 and 6 are based on the premise that the load (output) of the compressor 1 is maintained constant at the rated load (rated output), and Fig. 6 shows a schematic diagram of the inlet guide vane 8, the rotor blades 1S, and the variable stator vanes 1C extracted from the configuration of the compressor 1 shown in Fig. 1.

[0029] In this embodiment, in the temperature range where the compressor inlet temperature T1C is equal to or higher than the threshold value Tth, as in Figure 3, the first opening D1 of the inlet guide vane 8 and the second opening D2 of the variable stator vane 1C are maintained approximately constant at openings D1a and D2a, respectively, so that the opening ratio D1 / D2 corresponds to the load (rated load).

[0030] On the other hand, in a temperature range where the compressor inlet temperature T1C is less than the threshold value Tth, the control unit 120 controls the first actuator 10 and the second actuator 12 so that the opening ratio D1 / D2 of the first opening D1 to the second opening D2 increases as the compressor inlet temperature T1C decreases. In Fig. 5, as an example of such control, the first opening D1 of the inlet guide vane 8 is kept substantially constant at opening D1a for the compressor inlet temperature T1C, while the second opening D2 of the variable stator vane 1C is controlled to decrease from opening D2a as the compressor inlet temperature T1C decreases.

[0031] To further explain the control of the first opening D1 and the second opening D2 by the control unit 120 from the viewpoint of the opening change rate, when the compressor inlet temperature T1C is less than the threshold value Tth, the control unit 120 controls the first actuator 10 and the second actuator 12 so that the second rate of change R2 of the second opening D2 with respect to the compressor inlet temperature T1C is greater than the first rate of change R1 of the first opening D1 with respect to the compressor inlet temperature T1C. In this embodiment, as shown in Fig. 5, in the temperature range in which the compressor inlet temperature T1C is less than the threshold value Tth, the first opening D1 is kept substantially constant and therefore the first rate of change R1 is substantially zero, whereas the second opening D2 decreases as the compressor inlet temperature T1C decreases and therefore the second rate of change R2 is greater than the first rate of change R1.

[0032] As a result, as the compressor inlet temperature T1C decreases and the density of the intake air taken into the compressor 1 increases, the opening of the variable stator vanes 1C is reduced relatively more than that of the inlet guide vanes 8, thereby suppressing the reduction in the opening of the inlet guide vanes 8 and suppressing the generation of compressed gas by reducing the opening of the variable stator vanes 1C, thereby making it possible to suitably control the amount of compressed gas supplied to the destination from the compressor 1. At this time, because the reduction in the opening of the inlet guide vanes 8 is suppressed compared to the reference technology described above, as shown in FIG. 6, the load on the rotor blades 1S downstream of the inlet guide vanes 8 is less likely to decrease, and an increase in the flow velocity (Mach number) supplied to the stator vanes 1C further downstream of the rotor blades 1S is suppressed. As a result, even when the compressor inlet temperature T1C decreases, a decrease in the efficiency of the compressor 1 can be effectively suppressed.

[0033] The control of the first actuator 10 and the second actuator 12 by such a control unit 120 is performed such that when the compressor inlet temperature T1C is less than the threshold value Tth, the opening ratio D1 / D2 increases compared to the case where the compressor inlet temperature T1C is greater than or equal to the threshold value Tth. That is, when the compressor inlet temperature T1C becomes lower than the threshold value Tth, the second opening D2 of the variable stator vane 1C decreases relatively more than the first opening D1 of the inlet guide vane 8. Thereby, when the compressor inlet temperature T1C becomes low, while suppressing the decrease of the first opening D1 of the inlet guide vane 8, by suppressing the generation of compressed gas due to the decrease of the second opening D2 of the variable stator vane 1C, the load on the rotor blade 1S downstream of the inlet guide vane 8 is less likely to decrease, and an increase in the flow velocity (Mach number) supplied to the variable stator vane 1C further downstream of the rotor blade 1S is suppressed. As a result, even when the compressor inlet temperature T1C decreases, a decrease in the efficiency of the compressor 1 can be effectively suppressed.

[0034] The threshold value Tth may be variably set based on the load of the compressor 1. For example, the threshold value Tth is set lower as the load of the compressor 1 decreases. FIG. 7 is a control example of the opening ratio D1 / D2 of the first opening D1 and the second opening D2, and the absolute values D1, D2 with respect to the compressor inlet temperature T1C when the load of the compressor 1 is a partial load.

[0035] In FIG. 7, it is assumed that the load (output) of the compressor 1 is constantly maintained at a predetermined partial load lower than the aforementioned rated load (rated output). In the temperature range where the compressor inlet temperature T1C is greater than or equal to the threshold value Tth´ (<Tth) corresponding to the partial load value, the first opening D1 of the inlet guide vane 8 is held substantially constant at the opening D1b corresponding to the partial load value, and the second opening D2 of the variable stator vane 1C is held substantially constant at the opening D2b corresponding to the partial load value. These openings D1b and D2b are smaller values than the openings D1a and D2a corresponding to the aforementioned rated load.

[0036] On the other hand, in a temperature range where the compressor inlet temperature T1C is less than a threshold value Tth' corresponding to a partial load value, the control unit 120 controls the first actuator 10 and the second actuator 12 so that the opening ratio D1 / D2 of the first opening D1 to the second opening D2 increases as the compressor inlet temperature T1C decreases. In Fig. 7, as an example of such control, the first opening D1 of the inlet guide vane 8 is kept substantially constant at opening D1a for the compressor inlet temperature T1C, while the second opening D2 of the variable stator vane 1C is controlled to decrease from opening D2a as the compressor inlet temperature T1C decreases.

[0037] Since the opening degrees of the inlet guide vanes 8 and the variable stator vanes 1C vary depending on the load, by making the threshold value Tth variable based on the load of the compressor 1 in this way, the compressor 1 can be operated efficiently.

[0038] As described above, according to each of the above embodiments, when the compressor inlet temperature falls below a threshold value due to, for example, a cold region or climate change, the actuators are controlled to increase the opening ratio of the first opening of the inlet guide vane to the second opening of the variable stator vane as the compressor inlet temperature decreases. As a result, as the compressor inlet temperature decreases and the density of the intake air taken into the compressor increases, the opening of the variable stator vane is reduced relatively more than that of the inlet guide vane. This reduces the decrease in the opening of the inlet guide vane while suppressing the generation of compressed gas by reducing the opening of the variable stator vane, thereby enabling optimal control of the amount of compressed gas supplied from the compressor to the supply destination. By suppressing the decrease in the opening of the inlet guide vane, the load on the rotor blades downstream of the inlet guide vane is less likely to decrease, and an increase in the flow velocity (Mach number) supplied to the stator vanes further downstream of the rotor blades is suppressed. As a result, even when the compressor inlet temperature decreases, a decrease in compressor efficiency can be effectively suppressed. As a result, it is possible to provide a compressor control device, a compressor control method, and a compressor control program that can suppress a decrease in efficiency even when the compressor inlet temperature drops.

[0039] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate.

[0040] The contents described in each of the above embodiments can be understood, for example, as follows.

[0041] (1) A compressor control device according to one aspect includes: an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; a compressor inlet temperature detection unit for detecting a compressor inlet temperature at the inlet portion; a control unit for controlling the first actuator and the second actuator; Equipped with When the compressor inlet temperature is less than a threshold value, the control unit controls the first actuator and the second actuator so that the opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases.

[0042] According to the above aspect (1), when the compressor inlet temperature falls below a threshold value due to, for example, a cold region or climate change, the actuator is controlled so that the opening ratio of the first opening of the inlet guide vane to the second opening of the variable stator vane increases as the compressor inlet temperature decreases. As a result, as the compressor inlet temperature decreases and the density of the intake air taken into the compressor increases, the opening of the variable stator vane is reduced relatively more than that of the inlet guide vane. This reduces the decrease in the opening of the inlet guide vane while suppressing the generation of compressed gas by reducing the opening of the variable stator vane, thereby enabling optimal control of the amount of compressed gas supplied from the compressor to the supply destination. By suppressing the decrease in the opening of the inlet guide vane, the load on the rotor blades downstream of the inlet guide vane is less likely to decrease, and an increase in the flow velocity (Mach number) supplied to the stator vanes further downstream of the rotor blades is suppressed. As a result, even when the compressor inlet temperature decreases, a decrease in compressor efficiency can be effectively suppressed.

[0043] (2) In another embodiment, in the above embodiment (1), The control unit controls the first actuator and the second actuator so that the opening ratio is increased when the compressor inlet temperature is less than the threshold value compared to when the compressor inlet temperature is equal to or greater than the threshold value.

[0044] According to the above aspect (2), when the compressor inlet temperature falls below a threshold value, the opening ratio is controlled to increase compared to when the compressor inlet temperature is equal to or higher than the threshold value, thereby reducing the opening of the variable stator vanes relatively more than that of the inlet guide vanes. As a result, even when the compressor inlet temperature falls, the opening of the inlet guide vanes is suppressed while the opening of the variable stator vanes is reduced to suppress the generation of compressed gas, so that the load on the rotor blades downstream of the inlet guide vanes is less likely to decrease, and an increase in the flow velocity (Mach number) supplied to the stator vanes further downstream of the rotor blades is suppressed. As a result, even when the compressor inlet temperature falls, a decrease in compressor efficiency can be effectively suppressed.

[0045] (3) In another aspect, in the above aspect (1) or (2), The threshold value is set lower as the load on the compressor decreases.

[0046] According to the above aspect (3), the opening degree of the inlet guide vanes and the variable stator vanes varies depending on the load, and therefore the threshold value can be set lower as the load on the compressor decreases, thereby enabling the compressor to be operated efficiently.

[0047] (4) In another embodiment, in any one of the above (1) to (3), When the compressor inlet temperature is less than the threshold value, the control unit controls the first actuator and the second actuator so that a second rate of change of the second opening with respect to the compressor inlet temperature is greater than a first rate of change of the first opening with respect to the compressor inlet temperature.

[0048] According to the above aspect (4), when the compressor inlet temperature falls below a threshold, the actuator is controlled so that the second rate of change of the variable stator vane's second opening with respect to the compressor inlet temperature is greater than the first rate of change of the inlet guide vane's first opening with respect to the compressor inlet temperature. This relatively increases the rate of change of the variable stator vane's opening compared to the inlet guide vane, thereby suppressing a decrease in the inlet guide vane's opening and suppressing the generation of compressed gas by reducing the variable stator vane's opening, thereby enabling optimal control of the amount of compressed gas supplied from the compressor to its destination. Suppressing the decrease in the inlet guide vane's opening makes it difficult for the load on the rotor blades downstream of the inlet guide vanes to decrease, thereby suppressing an increase in the flow velocity (Mach number) supplied to the stator vanes further downstream of the rotor blades. As a result, even when the compressor inlet temperature decreases, a decrease in compressor efficiency can be effectively suppressed.

[0049] (5) In another embodiment, in any one of the above (1) to (4), When the compressor inlet temperature is lower than the threshold value, the control unit controls the first actuator so that the first opening degree is maintained.

[0050] According to the above aspect (5), When the compressor inlet temperature falls below the threshold, the first opening of the inlet guide vane is maintained, for example, substantially constant, thereby suppressing a decrease in the opening of the inlet guide vane. This makes it difficult for the load on the rotor blades downstream of the inlet guide vane to decrease, and suppresses an increase in the flow velocity (Mach number) supplied to the stator vanes further downstream of the rotor blades. As a result, even when the compressor inlet temperature decreases, a decrease in compressor efficiency can be effectively suppressed.

[0051] (6) In another embodiment, in any one of the above (1) to (5), The compressor has the variable stator vanes and the rotor blades arranged in multiple stages, The variable stator vanes are adjusted in conjunction with one another by the second actuator.

[0052] According to the above aspect (6), the variable stator vanes and rotor blades are arranged in multiple stages downstream of the inlet guide vane. In this configuration, the variable stator vanes of each stage are adjusted in conjunction with each other by the second actuator.

[0053] (7) In another embodiment, in any one of the above (1) to (6), The control unit controls the opening ratio based on a load on the compressor.

[0054] According to the above aspect (7), the inlet guide vanes and the variable stator vanes are controlled based on the opening ratio corresponding to the load of the compressor. As a result, the inlet guide vanes and the variable stator vanes are controlled in a predetermined relationship depending on the value of the load of the compressor so that the opening ratio corresponding to the load is realized.

[0055] (8) A method for controlling a compressor according to one aspect includes: an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; A method for controlling a compressor comprising: detecting a compressor inlet temperature at the inlet section; When the compressor inlet temperature is less than a threshold value, controlling the first actuator and the second actuator so that an opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases. Equipped with.

[0056] According to the above aspect (8), when the compressor inlet temperature falls below a threshold value due to, for example, a cold region or climate change, the actuator is controlled so that the opening ratio of the first opening of the inlet guide vane to the second opening of the variable stator vane increases as the compressor inlet temperature decreases. As a result, as the compressor inlet temperature decreases and the density of the intake air taken into the compressor increases, the opening of the variable stator vane is reduced relatively more than that of the inlet guide vane. This reduces the reduction in the opening of the inlet guide vane while suppressing the generation of compressed gas by reducing the opening of the variable stator vane, thereby enabling optimal control of the amount of compressed gas supplied from the compressor to the supply destination. By suppressing the reduction in the opening of the inlet guide vane, the load on the rotor blades downstream of the inlet guide vane is less likely to decrease, and an increase in the flow velocity (Mach number) supplied to the stator vanes further downstream of the rotor blades is suppressed. As a result, even when the compressor inlet temperature decreases, a decrease in compressor efficiency can be effectively suppressed.

[0057] (9) A control program for a compressor according to one aspect includes: an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; A control program for a compressor comprising: On the computer, detecting a compressor inlet temperature at the inlet section; When the compressor inlet temperature is less than a threshold value, controlling the first actuator and the second actuator so that an opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases. is possible.

[0058] According to the above aspect (9), when the compressor inlet temperature falls below a threshold value due to, for example, a cold region or climate change, the actuator is controlled so that the opening ratio of the first opening of the inlet guide vane to the second opening of the variable stator vane increases as the compressor inlet temperature decreases. As a result, as the compressor inlet temperature decreases and the density of the intake air taken into the compressor increases, the opening of the variable stator vane is reduced relatively more than that of the inlet guide vane. This reduces the reduction in the opening of the inlet guide vane while suppressing the generation of compressed gas by reducing the opening of the variable stator vane, thereby enabling optimal control of the amount of compressed gas supplied from the compressor to the supply destination. By suppressing the reduction in the opening of the inlet guide vane, the load on the rotor blades downstream of the inlet guide vane is less likely to decrease, and an increase in the flow velocity (Mach number) supplied to the stator vanes further downstream of the rotor blades is suppressed. As a result, even when the compressor inlet temperature decreases, a decrease in compressor efficiency can be effectively suppressed. [Explanation of symbols]

[0059] 1 Compressor 1C~6C Stator blades (variable stator blades) 1S~6S moving blade 2 Casing 4 Compressor inlet 6 Struts 8 Inlet guide vane 10 First Actuator 12 Second actuator 13 Rotation axis 14 Temperature Sensor 100 Control device (compressor control device) 110 Compressor inlet temperature detection unit 120 control section D1 First opening D2 2nd opening degree T1C Compressor inlet temperature Tth threshold

Claims

1. an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; a compressor inlet temperature detection unit for detecting a compressor inlet temperature at the inlet portion; a control unit for controlling the first actuator and the second actuator; Equipped with the control unit controls at least one of the first opening degree or the second opening degree to decrease as the compressor inlet temperature decreases, and, when the compressor inlet temperature is less than a threshold value, controls the first actuator and the second actuator so that an opening ratio of the first opening degree to the second opening degree increases as the compressor inlet temperature decreases.

2. 2. The compressor control device according to claim 1, wherein the control unit controls the first actuator and the second actuator so that the opening ratio is increased when the compressor inlet temperature is less than the threshold value compared to when the compressor inlet temperature is equal to or greater than the threshold value.

3. The compressor control device according to claim 1 or 2, wherein the threshold value is set lower as the load on the compressor decreases.

4. 3. The compressor control device according to claim 1, wherein, when the compressor inlet temperature is less than the threshold value, the control unit controls the first actuator and the second actuator so that a second rate of change of the second degree of opening with respect to the compressor inlet temperature is greater than a first rate of change of the first degree of opening with respect to the compressor inlet temperature.

5. The compressor control device according to claim 1 or 2, wherein the control unit controls the first actuator so that the first opening degree is maintained when the compressor inlet temperature is lower than the threshold value.

6. The compressor has the variable stator vanes and the rotor blades arranged in multiple stages, The compressor control device according to claim 1 or 2, wherein each of the variable stator vanes is adjusted in conjunction with one another by the second actuator.

7. The compressor control device according to claim 1 or 2, wherein the control unit controls the opening ratio based on a load of the compressor.

8. An inlet guide vane provided at the inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; a compressor inlet temperature detection unit for detecting a compressor inlet temperature at the inlet portion; a control unit for controlling the first actuator and the second actuator; Equipped with the control unit controls the first actuator and the second actuator such that, when the compressor inlet temperature is lower than a threshold value, an opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases; and The compressor control device is configured such that the threshold value is set lower as the load on the compressor decreases.

9. An inlet guide vane provided at the inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; a compressor inlet temperature detection unit for detecting a compressor inlet temperature at the inlet portion; a control unit for controlling the first actuator and the second actuator; Equipped with the control unit controls the first actuator and the second actuator such that, when the compressor inlet temperature is lower than a threshold value, an opening ratio of the first opening to the second opening increases as the compressor inlet temperature decreases; and The control unit controls the first actuator so that the first opening degree is maintained when the compressor inlet temperature is lower than the threshold value.

10. an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; A method for controlling a compressor comprising: detecting a compressor inlet temperature at the inlet section; controlling at least one of the first opening degree and the second opening degree to decrease as the compressor inlet temperature decreases, and when the compressor inlet temperature is less than a threshold value, controlling the first actuator and the second actuator so that an opening ratio of the first opening degree to the second opening degree increases as the compressor inlet temperature decreases; A compressor control method comprising:

11. an inlet guide vane provided at an inlet portion of the compressor; a variable stator vane disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stator vane; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stator vane; A control program for a compressor comprising: On the computer, detecting a compressor inlet temperature at the inlet section; controlling at least one of the first opening degree and the second opening degree to decrease as the compressor inlet temperature decreases, and when the compressor inlet temperature is less than a threshold value, controlling the first actuator and the second actuator so that an opening ratio of the first opening degree to the second opening degree increases as the compressor inlet temperature decreases; A compressor control program capable of executing the above.

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