A control system and method for a large compressor aerodynamic vane actuator

Abstract

The present application relates to a kind of control system and method of large compressor pneumatic guide vane actuator, control system includes pneumatic actuator, actuator state detection system, guide vane opening control system, electrical isolation system, power supply system and terminal block;Pneumatic actuator is used to control the opening of large compressor guide vane;Actuator state detection system is used to detect the opening and closing state of pneumatic actuator and the real-time position of piston;Guide vane opening control system is used to transfer the instruction of compressor DCS control system and feedback instruction execution situation;Electrical isolation system is used to provide power supply current and signal current;Power supply system is used to convert alternating current power into direct current power.The control system described in the present application has the characteristics of safe and reliable, high control precision, fast response speed, and has the protection functions such as gas break, power break, signal break;The volume and self weight of pneumatic guide vane actuator meet the needs of the field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large-scale compressors, in particular to a control system and method for a pneumatic guide vane actuator of a large-scale compressor. BACKGROUND

[0002] Large-scale air separation devices (hereinafter referred to as air separation devices) are mainly used for separating oxygen, nitrogen, argon and other gases from air. The separated oxygen, nitrogen, argon and other gases have wide industrial applications. Large-scale air compressors (hereinafter referred to as air compressors) are the main equipment in air separation devices, and their main function is to provide air for air separation devices. The air flow guide vane regulating actuator at the inlet of the air compressor is an important key equipment for regulating the air flow during the start-up and production process of the air compressor, and its control accuracy and safety reliability are crucial for the production and operation of the air separation device. At present, the guide vane regulating actuator of the air compressor is usually divided into a pneumatic guide vane actuator, an electric guide vane actuator and a hydraulic guide vane actuator.

[0003] The hydraulic guide vane actuator uses high-pressure liquid as a power source, has the characteristics of large push-pull force and stable system operation, but the system requires more supporting equipment, has high cost, and the on-site construction operation is complex, so it is less used.

[0004] Compared with the hydraulic guide vane system, the electric guide vane actuator has the advantages of relatively simple system composition, independent system, simple on-site construction and installation, etc. The composition of the actuator is composed of a driving motor, a gear and rack mechanism and electronic components. In the air separation process, due to the requirements of special working conditions, the guide vane actuator of the air compressor is in a state of 24-hour 360-day continuous high-frequency regulation. The electric guide vane actuator has more electrical components, its system response is slow, the action time is long, and the relative failure rate is high, so the electric guide vane actuator is also less used in practice, and the relative failure rate is high in the actual application process, which is not conducive to the long-term stable operation of the air separation process.

[0005] Compared with the hydraulic guide vane actuator and the electric guide vane actuator, the pneumatic guide vane actuator has the characteristics of simple structure, long-term continuous stable operation, fast control response speed, simple on-site construction and installation, etc. At present, the guide vane drive system of the air compressor of the large-scale air separation device mostly uses the pneumatic guide vane actuator. The disadvantage is that the pneumatic components are limited by the working air pressure, which limits the processing size of the cylinder, and limits the application of the pneumatic guide vane actuator in the guide vane drive system of the large-scale air compressor. SUMMARY

[0006] The present application provides a control system and method for a pneumatic guide vane actuator of a large-scale compressor, which has the characteristics of safety and reliability, high control accuracy and fast response speed, and has protection functions such as gas interruption, power interruption and signal interruption. The volume and weight of the pneumatic guide vane actuator meet the on-site requirements.

[0007] To achieve the above object, the present application adopts the following technical solutions:

[0008] A control system of a large compressor pneumatic guide vane actuator, comprising a pneumatic actuator, an actuator state detection system, a guide vane opening control system, an electrical isolation system, a power supply system and a terminal block; the pneumatic actuator is used to control the opening of the large compressor guide vane; the actuator state detection system is used to detect the opening and closing state of the pneumatic actuator and the real-time position of the piston; the guide vane opening control system is used to transmit the instructions of the compressor DCS control system and feedback the instruction execution; the electrical isolation system is arranged between the power supply system and the actuator state detection system and the power supply system and the guide vane opening control system, and is used to supply power current and signal current to the actuator state detection system and the guide vane opening control system; the power supply system is used to convert 220V AC power into 24V DC power, and the power supply system is a dual power supply redundant system.

[0009] Further, a control system of a large compressor pneumatic guide vane actuator, the pneumatic actuator is a double-acting pneumatic actuator, the cylinder body diameter is < DN500mm; the pneumatic actuator is composed of a cylinder body, a piston and a piston rod;

[0010] The actuator state detection system is composed of a stroke position switch and a hysteresis displacement sensor; the stroke position switch is arranged on the piston rod and is used to detect the fully open state and the fully closed state of the pneumatic actuator; the hysteresis displacement sensor is arranged in the piston rod and is used to detect the real-time position of the piston;

[0011] The guide vane opening control system is a pneumatic intelligent positioner, which is provided with a signal conversion module, an input signal interface and an output signal interface; the signal conversion module is used to convert the displacement signal of the hysteresis displacement sensor into an electrical parameter signal;

[0012] The electrical isolation system comprises a first isolator and a second isolator;

[0013] The power supply system comprises a first DC stabilized power supply, a second DC stabilized power supply and a DC power supply redundancy module;

[0014] The terminal block is provided with an AC power input interface, a first AC power output interface, a second AC power output interface, an input control signal interface, a position feedback signal output interface, a DC power input interface, a DC power output interface, a positioner signal interface and a sensor power interface;

[0015] The AC power input interface of the terminal block is connected with a 220V AC power source, the first AC power interface of the terminal block is connected with the AC power input interface of the first DC voltage stabilizer, the second AC power interface of the terminal block is connected with the AC power input interface of the second DC voltage stabilizer, the DC power output interface of the first DC voltage stabilizer and the DC power output interface of the second DC voltage stabilizer are respectively connected with the DC power input interface of the DC power redundancy module; the DC power output interface of the DC power redundancy module is connected with the DC power input interface of the terminal block; the DC power output interface of the terminal block is connected with the power input interface of the first isolator and the power input interface of the second isolator.

[0016] The position feedback signal output interface of the terminal block is connected with the feedback signal input end of the compressor DCS control system; the input control signal interface of the terminal block is connected with the control signal output end of the compressor DCS control system, and the input control signal interface of the terminal block is additionally connected with the input signal interface of the pneumatic intelligent positioner; the signal output interface of the magnetic hysteresis displacement sensor is connected with the signal input interface of the second isolator, and the signal output interface of the second isolator is connected with the signal conversion module of the pneumatic intelligent positioner; the positive electrode of the positioner signal interface of the terminal block is connected with the positive electrode of the input signal interface of the first isolator, the negative electrode of the input signal interface of the first isolator is connected with the negative electrode of the output signal interface of the pneumatic intelligent positioner, and the positive electrode of the output signal interface of the pneumatic intelligent positioner is connected with the negative electrode of the positioner signal interface of the terminal block; the sensor power supply interface of the terminal block is connected with the power supply interface of the magnetic hysteresis displacement sensor.

[0017] The driving end of the pneumatic intelligent positioner is connected with a gas source, and the pressure of the gas source is 1.0MPa; the output signal interface of the pneumatic intelligent positioner is connected with the control end of the pneumatic actuator through two control gas paths, one of which is connected with the rod cavity of the cylinder body, and the other of which is connected with the rodless cavity of the cylinder body.

[0018] Further, a control system of a large-scale compressor pneumatic guide vane actuator, the pneumatic actuator is a double-acting pneumatic actuator, the diameter of the cylinder body is greater than or equal to DN500mm; the pneumatic actuator is composed of a cylinder body, a piston and a piston rod;

[0019] The actuator state detection system is composed of a travel position switch and a magnetic hysteresis displacement sensor; the travel position switch is arranged on the piston rod and is used for detecting the fully open state and the fully closed state of the pneumatic actuator; the magnetic hysteresis displacement sensor is arranged in the piston rod and is used for detecting the real-time position of the piston;

[0020] The guide vane opening degree control system is composed of a pneumatic intelligent positioner, a first pneumatic relay, a second pneumatic relay and a pneumatic holding valve, and the pneumatic intelligent positioner is provided with a signal conversion module, an input signal interface and an output signal interface; the signal conversion module is used for converting the displacement signal of the hysteresis displacement sensor into an electric parameter signal;

[0021] The electrical isolation system comprises a first isolator and a second isolator;

[0022] The power supply system comprises a first DC voltage stabilizer, a second DC voltage stabilizer and a DC power redundancy module;

[0023] The terminal block is provided with an AC power input interface, a first AC power output interface, a second AC power output interface, an input control signal interface, a position feedback signal output interface, a DC power input interface, a DC power output interface, a positioner signal interface and a sensor power interface;

[0024] The AC power input interface of the terminal block is connected with a 220V AC power source, the first AC power interface of the terminal block is connected with the AC power input interface of the first DC voltage stabilizer, the second AC power interface of the terminal block is connected with the AC power input interface of the second DC voltage stabilizer, the DC power output interface of the first DC voltage stabilizer and the DC power output interface of the second DC voltage stabilizer are respectively connected with the DC power input interface of the DC power redundancy module; the DC power output interface of the DC power redundancy module is connected with the DC power input interface of the terminal block; the DC power output interface of the terminal block is connected with the power input interface of the first isolator and the power input interface of the second isolator;

[0025] The position feedback signal output interface of the terminal block is connected with the feedback signal input end of the compressor DCS control system; the input control signal interface of the terminal block is connected with the control signal output end of the compressor DCS control system, and the input control signal interface of the terminal block is additionally connected with the input signal interface of the pneumatic intelligent positioner; the signal output interface of the hysteresis displacement sensor is connected with the signal input interface of the second isolator, the signal output interface of the second isolator is connected with the signal conversion module of the pneumatic intelligent positioner; the positive electrode of the positioner signal interface of the terminal block is connected with the positive electrode of the input signal interface of the first isolator, the negative electrode of the input signal interface of the first isolator is connected with the negative electrode of the output signal interface of the pneumatic intelligent positioner, and the positive electrode of the output signal interface of the pneumatic intelligent positioner is connected with the negative electrode of the positioner signal interface of the terminal block; the sensor power interface of the terminal block is connected with the power interface of the hysteresis displacement sensor;

[0026] The output signal interface of the pneumatic intelligent positioner is connected to the control end of the pneumatic actuator through a control gas path, and the control gas path is provided with a first pneumatic relay, a second pneumatic relay and a pneumatic holding valve; the driving end of the pneumatic intelligent positioner, the first pneumatic relay, the second pneumatic relay and the pneumatic holding valve are connected to a gas source, and the pressure of the gas source is 1.0 MPa; the output signal interface of the pneumatic intelligent positioner is connected to the control signal input end of the first pneumatic relay and the control signal input end of the second pneumatic relay respectively, the control signal output end of the first pneumatic relay is connected to the first valve port of the pneumatic holding valve, and the control signal output end of the second pneumatic relay is connected to the second valve port of the pneumatic holding valve; the third valve port of the pneumatic holding valve is connected to the rod cavity of the cylinder body, and the fourth valve port of the pneumatic holding valve is connected to the rodless cavity of the cylinder body.

[0027] Further, the first isolator and the second isolator are Weidmuller ACT20P-Cl-2CO signal isolators.

[0028] Further, the first DC voltage stabilizer and the second DC voltage stabilizer are both SIEMENS 6EP3331-6SB00-0AY0 DC voltage stabilizers; and the DC power supply redundancy module is Weidmuller PRODM-10 DC power supply redundancy module.

[0029] Further, the first pneumatic relay and the second pneumatic relay are both ControLAir 600-CA pneumatic relays; and the pneumatic holding valve is Fisher 377 pressure sensing holding valve.

[0030] Further, the magnetic hysteresis displacement sensor is KYDM-LP1A4210-GC0180M1H03-W0-ASMS magnetic hysteresis expansion displacement sensor.

[0031] Further, the pneumatic intelligent positioner is ABB EDP300-Y0H2F2DA1S3 pneumatic intelligent valve positioner.

[0032] A control method of a large-scale compressor pneumatic guide vane actuator (cylinder body diameter < DN500mm), comprising the following processes:

[0033] 1) Actuator state detection;

[0034] Detecting whether the cylinder is in full open state or full closed state by a stroke position switch arranged on the piston rod of the pneumatic actuator, and transmitting the signal to the compressor DCS control system;

[0035] The real-time position of the piston is detected by the hysteresis displacement sensor arranged in the piston rod of the pneumatic actuator, and the piston position, i.e. the displacement signal, is fed back to the pneumatic intelligent positioner, which is converted into an electrical parameter signal that can be received by the pneumatic intelligent positioner by a signal conversion module, and then the pneumatic intelligent positioner receives the signal and transmits the signal to the compressor DCS control system for display;

[0036] 2) Guide vane opening degree control;

[0037] The pneumatic intelligent positioner sends the piston displacement instruction signal sent by the compressor DCS control system to the control end of the pneumatic actuator to control the action of the pneumatic actuator to adjust the guide vane opening degree;

[0038] 3) Power supply;

[0039] The first and second DC voltage stabilizers are used to convert 220V AC power into 24V DC power to supply power current and signal current to the pneumatic intelligent positioner and the hysteresis displacement sensor; the DC power redundancy module is used to realize the redundant supply of the two DC power supplies; the first and second isolators are used to realize electrical isolation between the power supply system and the pneumatic intelligent positioner and between the power supply system and the hysteresis displacement sensor, thereby ensuring safe operation of the system.

[0040] A control method for a large-scale compressor pneumatic guide vane actuator (cylinder body diameter ≥ DN500mm) includes the following processes:

[0041] 1) Actuator state detection;

[0042] The travel position switch arranged on the piston rod of the pneumatic actuator is used to detect whether the cylinder is in a fully open state or a fully closed state, and the signal is transmitted to the compressor DCS control system;

[0043] The hysteresis displacement sensor arranged in the piston rod of the pneumatic actuator is used to detect the real-time position of the piston, and the piston position signal is fed back to the pneumatic intelligent positioner, which is converted into an electrical parameter signal that can be received by the pneumatic intelligent positioner by a position signal conversion module, and then the pneumatic intelligent positioner receives the signal and transmits the signal to the compressor DCS control system for display;

[0044] 3) Guide vane opening degree control;

[0045] The pneumatic intelligent positioner sends the piston displacement instruction signal sent by the compressor DCS control system to the control end of the pneumatic actuator to control the action of the pneumatic actuator to adjust the guide vane opening degree; the hold function of the pneumatic hold valve is used to ensure that the action of the pneumatic actuator is reliable and stable;

[0046] 3) Power supply;

[0047] The first DC voltage stabilizer and the second DC voltage stabilizer are used to convert 220V AC into 24V DC, and supply power current and signal current to the pneumatic intelligent positioner and the hysteresis displacement sensor; the redundancy module of the DC power supply is used to realize the redundancy supply of the two DC power supplies; the first isolator and the second isolator are used to realize the electrical isolation between the power supply system and the pneumatic intelligent positioner and the power supply system and the hysteresis displacement sensor, and guarantee the safe operation of the system.

[0048] Compared with the prior art, the present application has the following advantages:

[0049] 1) The control system adopts the pneumatic element with a pressure of 1.0Mpa and cooperates with the cylinder with a diameter of DN400mm or more, and the theoretical calculation thrust reaches 130kN or more. The actual measurement of the pneumatic actuator piston full stroke movement time is about 20 seconds, and the moving speed is 480mm / min. The system response accuracy reaches 0.05ma, and the control accuracy reaches 1mm.

[0050] 2) The cylinder diameter and stroke size of the pneumatic actuator meet the field installation requirements, and the installation is simple and fast.

[0051] 3) The piston rod of the pneumatic actuator is provided with a stroke position switch for detecting the full open and full closed states, so as to facilitate the grasping of the state of the pneumatic actuator.

[0052] 4) The piston rod of the pneumatic actuator is provided with a hysteresis displacement sensor for feeding back the real-time opening degree of the guide vane to the pneumatic intelligent positioner, and has the characteristics of high detection accuracy and fast response speed. Compared with the traditional mechanical position detection method, the control accuracy is greatly improved, and there is no problem of wear during use. The position signal of the hysteresis displacement sensor cooperates with the pneumatic intelligent positioner, so as to further improve the detection and control accuracy of the control system. The hysteresis displacement sensor has ultra-high precision linear error (less than 0.02%), and the repeatability can reach 0.001%. The hysteresis displacement signal is combined with the electrical parameters of the pneumatic intelligent positioner through the signal conversion module, the control output gas flow drives the pneumatic actuator, and the control accuracy can reach 1mm.

[0053] 5) The cylinder body diameter of the pneumatic actuator reaches DN400mm or more. When the cylinder body diameter is greater than or equal to DN500mm, in order to prevent the output control gas flow of the pneumatic intelligent positioner from failing to meet the control demand, a pneumatic relay is matched and set to amplify the gas flow.

[0054] 6) when the cylinder body diameter is greater than or equal to DN500mm, the control system of the application is provided with a pneumatic position-keeping valve, which has a pressure detection function, and can automatically cut off the air flow channel when the supply pressure is lower than the set pressure; when the air supply fails to supply air, the position-keeping valve is used to cut off the valve control channel, so that the valve position is kept at the position before the air supply is cut off, thereby ensuring the normal operation of the system until the position-keeping valve opens the channel and the normal control is restored;

[0055] 7) the control system of the application is provided with a pneumatic intelligent positioner, which has communication capability and can be electronically configured with parameters, and the control parameters matched with the terminal control element are automatically set by the pneumatic intelligent positioner, which can save a lot of debugging time and achieve optimal control; in addition, the pneumatic intelligent positioner also has a fault diagnosis function, and the output control air volume is more than 3 times that of the traditional pneumatic intelligent positioner, and the output control air volume and air pressure meet the thrust and pull force requirements of the pneumatic actuator;

[0056] 8) the control system of the application is provided with an electrical isolation system; the actuator state detection system and the guide vane opening control system are separately powered, and the input and output ends of the power supply and signals are isolated, and work independently and do not interfere with each other; thereby ensuring the continuous, safe and stable operation of the control system;

[0057] 9) the power supply system of the application adopts a dual-redundancy power supply system, which is composed of two independent DC stabilized power supplies and a DC power supply redundancy module, and the DC power supply redundancy module can monitor, control and redundantly output power supply in real time, thereby enhancing the reliability of the control system operation. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 is a schematic diagram of the control system of the large-scale compressor pneumatic guide vane actuator of embodiment 1 of the application.

[0059] Figure 2 is a schematic diagram of the control system of the large-scale compressor pneumatic guide vane actuator of embodiment 2 of the application.

[0060] In the figure: A. DC power supply redundancy module A1. First DC stabilized power supply A2. Second DC stabilized power supply B1. First isolator B2. Second isolator C. Pneumatic intelligent positioner C0. Signal conversion module C1. Pneumatic position-keeping valve C2. First pneumatic relay C3. Second pneumatic relay D. Pneumatic actuator D1. Hysteresis displacement sensor D2. Travel position switch E. Terminal block DETAILED DESCRIPTION

[0061] The specific embodiments of the application will be further described below in combination with the drawings:

[0062] As Figure 1 , Figure 2As shown, the control system of the large compressor pneumatic guide vane actuator of the application comprises a pneumatic actuator D, an actuator state detection system, a guide vane opening control system, an electrical isolation system, a power supply system and a terminal block; the pneumatic actuator D is used to control the opening of the large compressor guide vane; the actuator state detection system is used to detect the opening and closing state of the pneumatic actuator D and the real-time position of the piston; the guide vane opening control system is used to transmit the instructions of the compressor DCS control system and feedback the instruction execution; the electrical isolation system is arranged between the power supply system and the actuator state detection system and the power supply system and the guide vane opening control system, and is used to supply power current and signal current to the actuator state detection system and the guide vane opening control system; the power supply system is used to convert 220V AC power into 24V DC power, and the power supply system is a dual power supply redundant system.

[0063] Further, as shown, Figure 1 The control system of the large compressor pneumatic guide vane actuator of the application comprises a pneumatic actuator D, an actuator state detection system, a guide vane opening control system, an electrical isolation system, a power supply system and a terminal block; the pneumatic actuator D is used to control the opening of the large compressor guide vane; the actuator state detection system is used to detect the opening and closing state of the pneumatic actuator D and the real-time position of the piston; the guide vane opening control system is used to transmit the instructions of the compressor DCS control system and feedback the instruction execution; the electrical isolation system is arranged between the power supply system and the actuator state detection system and the power supply system and the guide vane opening control system, and is used to supply power current and signal current to the actuator state detection system and the guide vane opening control system; the power supply system is used to convert 220V AC power into 24V DC power, and the power supply system is a dual power supply redundant system.

[0064] The actuator state detection system is composed of a stroke position switch D2 and a magnetic hysteresis displacement sensor D1; the stroke position switch D2 is arranged on the piston rod and is used to detect the fully open state and the fully closed state of the pneumatic actuator D; the magnetic hysteresis displacement sensor D1 is arranged in the piston rod and is used to detect the real-time position of the piston;

[0065] The guide vane opening control system is a pneumatic intelligent positioner C, which is provided with a signal conversion module C0, an input signal interface and an output signal interface; the signal conversion module is used to convert the displacement signal of the magnetic hysteresis displacement sensor D1 into an electrical parameter signal;

[0066] The electrical isolation system comprises a first isolator B1 and a second isolator B2;

[0067] The power supply system comprises a first DC voltage stabilizing power supply A1, a second DC voltage stabilizing power supply A2 and a DC power supply redundancy module A;

[0068] The terminal block E is provided with an AC power input interface, a first AC power output interface, a second AC power output interface, an input control signal interface, a position feedback signal output interface, a DC power input interface, a DC power output interface, a positioner signal interface and a sensor power interface;

[0069] The AC power input interface of the terminal block E is connected with a 220V AC power supply, the first AC power interface of the terminal block E is connected with the AC power input interface of the first DC voltage stabilizer B1, the second AC power interface of the terminal block E is connected with the AC power input interface of the second DC voltage stabilizer B2, the DC power output interface of the first DC voltage stabilizer B1 and the DC power output interface of the second DC voltage stabilizer B2 are respectively connected with the DC power input interface of the DC power redundancy module A; the DC power output interface of the DC power redundancy module A is connected with the DC power input interface of the terminal block E; the DC power output interface of the terminal block E is connected with the power input interface of the first isolator B1 and the power input interface of the second isolator B2;

[0070] The position feedback signal output interface of the terminal block E is connected with the feedback signal input end of the compressor DCS control system; the input control signal interface of the terminal block E is connected with the control signal output end of the compressor DCS control system, and the input control signal interface of the terminal block E is additionally connected with the input signal interface of the pneumatic intelligent positioner C; the signal output interface of the magnetic hysteresis displacement sensor D1 is connected with the signal input interface of the second isolator B2, the signal output interface of the second isolator B2 is connected with the signal conversion module C0 of the pneumatic intelligent positioner C; the positive electrode of the positioner signal interface of the terminal block E is connected with the positive electrode of the input signal interface of the first isolator B1, the negative electrode of the input signal interface of the first isolator B1 is connected with the negative electrode of the output signal interface of the pneumatic intelligent positioner C, and the positive electrode of the output signal interface of the pneumatic intelligent positioner C is connected with the negative electrode of the positioner signal interface of the terminal block E; the sensor power supply interface of the terminal block E is connected with the power supply interface of the magnetic hysteresis displacement sensor D1;

[0071] The driving end of the pneumatic intelligent positioner C is connected with a gas source, and the pressure of the gas source is 1.0MPa; the output signal interface of the pneumatic intelligent positioner C is connected with the control end of the pneumatic actuator D through two control gas paths, one of which is connected with the rod cavity of the cylinder body, and the other of which is connected with the rodless cavity of the cylinder body.

[0072] Further, as shown in Figure 2 the control system of the large-scale compressor pneumatic guide vane actuator of the application, the pneumatic actuator is a double-acting pneumatic actuator, which is composed of a cylinder body, a piston and a piston rod; the diameter of the cylinder body is greater than or equal to DN500mm;

[0073] The actuator state detection system is composed of a travel position switch D2 and a magnetic hysteresis displacement sensor D1; the travel position switch D2 is arranged on the piston rod and is used for detecting the fully open state and the fully closed state of the pneumatic actuator D; the magnetic hysteresis displacement sensor D1 is arranged in the piston rod and is used for detecting the real-time position of the piston;

[0074] The guide vane opening degree control system is composed of a pneumatic intelligent positioner C, a first pneumatic relay C2, a second pneumatic relay C3 and a pneumatic holding valve C1, and the pneumatic intelligent positioner C is provided with a signal conversion module C0, an input signal interface and an output signal interface; the signal conversion module is used for converting the displacement signal of the hysteresis displacement sensor into an electric parameter signal;

[0075] The electrical isolation system comprises a first isolator B1 and a second isolator B2;

[0076] The power supply system comprises a first DC voltage stabilizer A1, a second DC voltage stabilizer A2 and a DC power supply redundancy module A;

[0077] The terminal block E is provided with an AC power input interface, a first AC power output interface, a second AC power output interface, an input control signal interface, a position feedback signal output interface, a DC power input interface, a DC power output interface, a positioner signal interface and a sensor power interface;

[0078] The AC power input interface of the terminal block E is connected with a 220V AC power source, the first AC power interface of the terminal block E is connected with the AC power input interface of the first DC voltage stabilizer B1, the second AC power interface of the terminal block E is connected with the AC power input interface of the second DC voltage stabilizer B2, the DC power output interface of the first DC voltage stabilizer B1 and the DC power output interface of the second DC voltage stabilizer B2 are respectively connected with the DC power input interface of the DC power supply redundancy module A, the DC power output interface of the DC power supply redundancy module A is connected with the DC power input interface of the terminal block E, and the DC power output interface of the terminal block E is connected with the power input interface of the first isolator B1 and the power input interface of the second isolator B2;

[0079] The position feedback signal output interface of the terminal block E is connected with the feedback signal input end of the compressor DCS control system, the input control signal interface of the terminal block E is connected with the control signal output end of the compressor DCS control system, the input control signal interface of the terminal block E is additionally connected with the input signal interface of the pneumatic intelligent positioner C, the signal output interface of the hysteresis displacement sensor D1 is connected with the signal input interface of the second isolator B2, the signal output interface of the second isolator B2 is connected with the signal conversion module C0 of the pneumatic intelligent positioner C, the positive pole of the positioner signal interface of the terminal block E is connected with the positive pole of the input signal interface of the first isolator B1, the negative pole of the input signal interface of the first isolator B1 is connected with the negative pole of the output signal interface of the pneumatic intelligent positioner C, the positive pole of the output signal interface of the pneumatic intelligent positioner C is connected with the negative pole of the positioner signal interface of the terminal block E, and the sensor power interface of the terminal block E is connected with the power interface of the hysteresis displacement sensor D1;

[0080] The output signal interface of the pneumatic intelligent positioner C is connected with the control end of the pneumatic actuator D through a control gas circuit, and the control gas circuit is provided with a first pneumatic relay C2, a second pneumatic relay C3 and a pneumatic holding valve C1; the driving ends of the pneumatic intelligent positioner C, the first pneumatic relay C2, the second pneumatic relay C3 and the pneumatic holding valve C1 are connected with a gas source, and the pressure of the gas source is 1.0 MPa; the output signal interface of the pneumatic intelligent positioner C is connected with the control signal input end of the first pneumatic relay C2 and the control signal input end of the second pneumatic relay C3 respectively, the control signal output end of the first pneumatic relay C2 is connected with the first valve port of the pneumatic holding valve C1, and the control signal output end of the second pneumatic relay C3 is connected with the second valve port of the pneumatic holding valve C1; the third valve port of the pneumatic holding valve C1 is connected with the rod cavity of the cylinder body, and the fourth valve port of the pneumatic holding valve C1 is connected with the rodless cavity of the cylinder body.

[0081] Further, the first isolator B1 and the second isolator B2 are ACT20P-Cl-2CO signal isolators of Weidmuller.

[0082] Further, the first DC voltage stabilizer A1 and the second DC voltage stabilizer A1 are 6EP3331-6SB00-0AY0 DC voltage stabilizers of SIEMENS, and the DC power supply redundancy module A is a PRODM-10 DC power supply redundancy module of Weidmuller.

[0083] Further, the first pneumatic relay C2 and the second pneumatic relay C3 are 600-CA pneumatic relays of ControLAir, and the pneumatic holding valve C1 is a Fisher 377 pressure sensing holding valve of FLSHER.

[0084] Further, the hysteresis displacement sensor D1 is a KYDM-LP1A4210-GC0180M1H03-W0-ASMS hysteresis telescopic displacement sensor of Kangyu.

[0085] Further, the pneumatic intelligent positioner C is an EDP300-Y0H2F2DA1S3 pneumatic intelligent valve positioner of ABB.

[0086] As shown in Figure 1 The control method of the large-scale compressor pneumatic guide vane actuator (the diameter of the cylinder body is less than DN500mm) provided by the application comprises the following processes:

[0087] 1) Actuator state detection

[0088] The stroke position switch D2 arranged on the piston rod of the pneumatic actuator D detects whether the cylinder is in a fully open state or a fully closed state, and transmits a signal to the compressor DCS control system;

[0089] The real-time position of the piston is detected by the hysteresis displacement sensor D1 arranged in the piston rod of the pneumatic actuator D, and a piston position signal is fed back to the pneumatic intelligent positioner C, is converted into an electric parameter signal that can be received by the pneumatic intelligent positioner C by the position signal conversion module C0, and then the pneumatic intelligent positioner C receives the signal and transmits the signal to the compressor DCS control system for display;

[0090] 4) Guide vane opening degree control;

[0091] The piston displacement instruction signal sent by the compressor DCS control system is sent to the control end of the pneumatic actuator D by the pneumatic intelligent positioner C, so as to control the pneumatic actuator D to act to adjust the guide vane opening degree;

[0092] 3) Power supply;

[0093] The first DC voltage stabilizer A1 and the second DC voltage stabilizer A2 are used to convert 220V AC into 24V DC, and supply power current and signal current to the pneumatic intelligent positioner C and the hysteresis displacement sensor D1; the DC power supply redundancy module A is used to realize the redundant supply of the two DC power supplies; the first isolator B1 and the second isolator B2 are used to realize the electrical isolation between the power supply system and the pneumatic intelligent positioner C and the power supply system and the hysteresis displacement sensor D1, so as to ensure the safe operation of the system.

[0094] As shown in Figure 2 The control method of the large-scale compressor pneumatic guide vane actuator (the cylinder body diameter is greater than or equal to DN500mm) provided by the application comprises the following processes:

[0095] 1) Actuator state detection;

[0096] The travel position switch D2 arranged on the piston rod of the pneumatic actuator D is used to detect whether the cylinder is in a fully open state or a fully closed state, and the signal is transmitted to the compressor DCS control system;

[0097] The hysteresis displacement sensor D1 arranged in the piston rod of the pneumatic actuator D is used to detect the real-time position of the piston, and a piston position signal is fed back to the pneumatic intelligent positioner C, is converted into an electric parameter signal that can be received by the pneumatic intelligent positioner C by the position signal conversion module C0, and then the pneumatic intelligent positioner C receives the signal and transmits the signal to the compressor DCS control system for display;

[0098] 5) Guide vane opening degree control;

[0099] The piston displacement instruction signal sent by the compressor DCS control system is sent to the control end of the pneumatic actuator D by the pneumatic intelligent positioner C after amplification, so as to control the pneumatic actuator D to act to adjust the guide vane opening degree; the hold function of the pneumatic hold valve C1 is used to ensure that the action of the pneumatic actuator D is reliable and stable;

[0100] 3) Power supply;

[0101] The first DC voltage regulator A1 and the second DC voltage regulator A2 convert 220V AC into 24V DC, and supply power current and signal current to the pneumatic intelligent positioner C and the hysteresis displacement sensor D1; the DC power redundancy module A is used to realize the redundant supply of two DC power supplies; the first isolator B1 and the second isolator B2 are used to realize the electrical isolation between the power supply system and the pneumatic intelligent positioner C and the power supply system and the hysteresis displacement sensor D1, thereby ensuring the safe operation of the system.

[0102] The control system and method of the large-scale compressor pneumatic guide vane actuator according to the application adopts two schemes according to the diameter of the gas body; when the diameter of the gas cylinder body is less than DN500mm, the control gas volume and the push-pull force output by the pneumatic intelligent positioner can fully meet the control requirements of the pneumatic actuator. When the diameter of the gas body is greater than or equal to DN500mm, in order to prevent the output gas volume of the pneumatic intelligent positioner from failing to meet the control requirements of the pneumatic actuator, a first pneumatic relay, a second pneumatic relay and a pneumatic hold valve are additionally configured. The function of the pneumatic hold valve is to ensure that the pneumatic actuator can stay at the position state when the gas source fails. The first pneumatic relay, the second pneumatic relay and the pneumatic hold valve all meet the working condition of the rated working pressure value of 1.0Mpa.

[0103] The following examples are implemented on the premise of the technical scheme of the application, and detailed implementation modes and specific operation processes are given, but the protection scope of the application is not limited to the following examples. The methods used in the following examples are all conventional methods unless otherwise specified.

[0104] Most of the air compressor guide vane actuators of air separation devices adopt pneumatic guide vane actuators, and a small part adopts hydraulic guide vane actuators, because the conventional pneumatic guide vane actuators used in the guide vane actuators of large-scale air compressors cannot meet the demand of huge push-pull force, and the hydraulic guide vane actuators have the problem of high cost. At present, the largest large-scale air compressor guide vane actuator usually adopts an electric guide vane actuator of a certain international well-known brand, and the shutdown thrust can reach 128kN, and the stroke speed is 35-280mm / min. The highest working pressure of the conventional pneumatic element is generally 0.7MPa, and if the pneumatic guide vane actuator is used, the size of the cylinder is too large and cannot meet the site installation requirements. The following two examples realize the control of the large-scale compressor pneumatic guide vane actuator.

[0105]

Example 1

[0106] The technical problem to be solved by the embodiment is to realize large air compressor guide vane driving by adopting a pneumatic element with a working pressure of 1.0 MPa and a DN400 mm cylinder, and greatly improve the push-pull force.

[0107] As shown in the drawings, Figure 1 In the embodiment, the control system of the pneumatic guide vane actuator of the large compressor includes a pneumatic actuator D, an actuator state detection system, a guide vane opening control system, an electrical isolation system, a power supply system and a terminal block E.

[0108] The pneumatic actuator D is used to control the opening of the large compressor guide vane; the actuator state detection system is used to detect the opening and closing state of the pneumatic actuator D and the real-time position of the piston; the guide vane opening control system is used to transmit the instructions of the compressor DCS control system and feedback the instruction execution; the electrical isolation system is arranged between the power supply system and the actuator state detection system and the power supply system and the guide vane opening control system, and is used to supply power current and signal current to the actuator state detection system and the guide vane opening control system; the power supply system is used to convert 220V AC power into 24V DC power, and the power supply system is a dual power supply redundant system.

[0109] In the embodiment, the pneumatic actuator D is composed of a cylinder body, a piston and a piston rod; the nominal diameter of the cylinder body is DN400 mm.

[0110] In the embodiment, the actuator state detection system is composed of a stroke position switch D2 and a hysteresis displacement sensor D1; the stroke position switch D2 is arranged on the piston rod and is used to detect the fully open state and the fully closed state of the pneumatic actuator D; the hysteresis displacement sensor D1 is arranged in the piston rod and is used to detect the real-time position of the piston;

[0111] In the embodiment, the guide vane opening control system is a pneumatic intelligent positioner C, which is provided with a signal conversion module C0, an input signal interface and an output signal interface; the signal conversion module C0 is used to convert the displacement signal of the hysteresis displacement sensor D1 into an electrical parameter signal;

[0112] In the embodiment, the electrical isolation system includes a first isolator B1 and a second isolator B2;

[0113] In the embodiment, the power supply system includes a first DC voltage stabilizing power supply A1, a second DC voltage stabilizing power supply A2 and a DC power supply redundancy module A;

[0114] In the embodiment, the terminal block E is provided with an AC power input interface, a first AC power output interface, a second AC power output interface, an input control signal interface, a position feedback signal output interface, a DC power input interface, a DC power output interface, a positioner signal interface and a sensor power interface;

[0115] In this embodiment, the AC power input interface of the terminal block E is connected to a 220V AC power supply, the first AC power input interface L1, N1 of the terminal block E is connected to the AC power input interface L1, N1 of the first DC stabilized power supply A1, the second AC power input interface L2, N2 of the terminal block E is connected to the AC power input interface L2, N2 of the second DC stabilized power supply A2, and the DC power output interface of the first DC stabilized power supply A1 and the DC power output interface of the second DC stabilized power supply A2 are respectively connected to the DC power input interface of the DC power redundancy module A; the DC power output interface of the DC power redundancy module A is connected to the DC power input interface 7, 8 of the terminal block E; and the DC power output interface 9, 10 of the terminal block E is connected to the power input interface 51, 52 of the first isolator B1 and the power input interface 51, 52 of the second isolator B2.

[0116] The position feedback signal output interface 3, 4 of the terminal block E is connected to the feedback signal input end of the compressor DCS control system; the input control signal interface 1, 2 of the terminal block E is connected to the control signal output end of the compressor DCS control system, and the input control signal interface 1, 2 of the terminal block E is additionally connected to the input signal interface 11, 12 of the pneumatic intelligent positioner C; the signal output interface 1, 2 of the magnetic hysteresis displacement sensor D1 is connected to the signal input interface 11, 12 of the second isolator B2, and the signal output interface 41, 42 of the second isolator B2 is connected to the signal conversion module C0 of the pneumatic intelligent positioner C; the positive electrode 11 of the positioner signal interface of the terminal block E is connected to the positive electrode 11 of the input signal interface of the first isolator B1, the negative electrode 22 of the input signal interface of the first isolator B1 is connected to the negative electrode 32 of the output signal interface of the pneumatic intelligent positioner C, and the positive electrode 31 of the output signal interface of the pneumatic intelligent positioner C is connected to the negative electrode 12 of the positioner signal interface of the terminal block E; the sensor power supply interface 13, 14 of the terminal block E is connected to the power supply interface 3, 4 of the magnetic hysteresis displacement sensor D1.

[0117] The output signal interface of the pneumatic intelligent positioner C is connected to the control end of the pneumatic actuator D through two control gas paths, one of which is connected to the rod cavity of the cylinder body, and the other of which is connected to the rodless cavity of the cylinder body.

[0118] In this embodiment, the pneumatic actuator is a double-acting pneumatic actuator, and the diameter of the cylinder body is DN400mm.

[0119] In this embodiment, the first isolator B1 and the second isolator B2 are signal isolators of the ACT20P-Cl-2CO type from Weidmuller, Germany.

[0120] In this embodiment, the hysteresis displacement sensor adopts the hysteresis expansion displacement sensor produced by Kangyu Measurement and Control Instrument Co., Ltd., with the model number of KYDM-LP1A4210-GC0180M1H03-W0-ASMS (other brands of hysteresis displacement sensors with the same function and form can also be used).

[0121] In this embodiment, the pneumatic intelligent positioner adopts the pneumatic intelligent valve positioner produced by ABB, with the model number of EDP300-Y0H2F2DA1S3.

[0122] The control method of the large compressor pneumatic guide vane actuator based on the control system described in this embodiment is as follows:

[0123] 1) Actuator state detection;

[0124] Whether the cylinder is in the fully open state or the fully closed state is detected by the stroke position switch D2 arranged on the piston rod of the pneumatic actuator D, and the signal is transmitted to the compressor DCS control system;

[0125] The real-time position of the piston is detected by the hysteresis displacement sensor D1 arranged in the piston rod of the pneumatic actuator D, and the piston position signal is fed back to the pneumatic intelligent positioner C. The position signal is converted into a signal that can be received by the pneumatic intelligent positioner C by the position signal conversion module C0, and then the pneumatic intelligent positioner C receives the signal and transmits it to the compressor DCS control system for display;

[0126] 6) Guide vane opening control;

[0127] The piston displacement command signal sent by the compressor DCS control system is sent to the control end of the pneumatic actuator D by the pneumatic intelligent positioner C, to control the action of the pneumatic actuator D to adjust the guide vane opening;

[0128] 3) Power supply;

[0129] The first DC voltage stabilizer A1 and the second DC voltage stabilizer A2 convert 220V AC power into 24V DC power, and supply power current and signal current to the pneumatic intelligent positioner C and the hysteresis displacement sensor D1. The DC power redundancy module A realizes the redundant supply of two DC power supplies. The first isolator B1 and the second isolator B2 realize the electrical isolation between the power supply system and the pneumatic intelligent positioner C, and the power supply system and the hysteresis displacement sensor D1, to ensure safe operation of the system

[0130]

Embodiment 2

[0131] The technical problem to be solved in this embodiment is to use a pneumatic element with a working pressure of 1.0 MPa to drive the guide vane of a large air compressor with a DN500mm cylinder, to greatly improve the push-pull force.

[0132] AsFigure 2 As shown in the figure, in the embodiment, the control system of the large compressor pneumatic guide vane actuator includes a pneumatic actuator D, an actuator state detection system, a guide vane opening control system, an electrical isolation system, a power supply system and a terminal board E.

[0133] The pneumatic actuator D is used to control the opening of the large compressor guide vane; the actuator state detection system is used to detect the opening and closing state of the pneumatic actuator D and the real-time position of the piston; the guide vane opening control system is used to transmit the instructions of the compressor DCS control system and feedback the instruction execution; the electrical isolation system is arranged between the power supply system and the actuator state detection system and the power supply system and the guide vane opening control system, and is used to supply power current and signal current to the actuator state detection system and the guide vane opening control system; the power supply system is used to convert 220V AC power into 24V DC power, and the power supply system is a dual power supply redundant system.

[0134] In the embodiment, the pneumatic actuator D is composed of a cylinder body, a piston and a piston rod; the nominal diameter of the cylinder body is DN500mm.

[0135] In the embodiment, the actuator state detection system is composed of a stroke position switch D2 and a magnetic hysteresis displacement sensor D1; the stroke position switch D2 is arranged on the piston rod and is used to detect the fully open state and the fully closed state of the pneumatic actuator D; the magnetic hysteresis displacement sensor D1 is arranged in the piston rod and is used to detect the real-time position of the piston.

[0136] In the embodiment, the guide vane opening control system is composed of a pneumatic intelligent positioner C, a first pneumatic relay C2, a second pneumatic relay C3 and a pneumatic hold valve C1, and the pneumatic intelligent positioner C is provided with a signal conversion module C0, an input signal interface and an output signal interface.

[0137] In the embodiment, the electrical isolation system includes a first isolator B1 and a second isolator B2.

[0138] In the embodiment, the power supply system includes a first DC voltage stabilizing power supply A1, a second DC voltage stabilizing power supply A2 and a DC power supply redundancy module A.

[0139] In the embodiment, the terminal board E is provided with an AC power input interface, a first AC power output interface, a second AC power output interface, an input control signal interface, a position feedback signal output interface, a DC power input interface, a DC power output interface, a positioner signal interface and a sensor power interface.

[0140] In this embodiment, the AC power input interface of the terminal board E is connected with 220V AC power, the first AC power interface L1, N1 of the terminal board E is connected with the AC power input interface L1, N1 of the first DC stabilized power supply A1, the second AC power interface L2, N2 of the terminal board E is connected with the AC power input interface L2, N2 of the second DC stabilized power supply A2, the DC power output interface of the first DC stabilized power supply A1 and the DC power output interface of the second DC stabilized power supply A2 are respectively connected with the DC power input interface of the DC power redundancy module A; the DC power output interface of the DC power redundancy module A is connected with the DC power input interface 7, 8 of the terminal board E; the DC power output interface 9, 10 of the terminal board E is connected with the power input interface 51, 52 of the first isolator B1 and the power input interface 51, 52 of the second isolator B2;

[0141] The position feedback signal output interface 3, 4 of the terminal board E is connected with the feedback signal input end of the compressor DCS control system; the input control signal interface 1, 2 of the terminal board E is connected with the control signal output end of the compressor DCS control system, and the input control signal interface 1, 2 of the terminal board E is additionally connected with the input signal interface 11, 12 of the pneumatic intelligent positioner C; the signal output interface 1, 2 of the magnetic hysteresis displacement sensor D1 is connected with the signal input interface 11, 12 of the second isolator B2, and the signal output interface 41, 42 of the second isolator B2 is connected with the signal conversion module C0 of the pneumatic intelligent positioner C; the positive positioner signal interface 11 of the terminal board E is connected with the positive input signal interface 11 of the first isolator B1, the negative input signal interface 22 of the first isolator B1 is connected with the negative output signal interface 32 of the pneumatic intelligent positioner C, and the positive output signal interface 31 of the pneumatic intelligent positioner C is connected with the negative positioner signal interface 12 of the terminal board E; the sensor power interface 13, 14 of the terminal board E is connected with the power interface 3, 4 of the magnetic hysteresis displacement sensor D1;

[0142] The output signal interface of the pneumatic intelligent positioner C is connected to the control end of the pneumatic actuator D through a control gas circuit, and the control gas circuit is provided with a first pneumatic relay C2, a second pneumatic relay C3 and a pneumatic holding valve C1; the driving ends of the pneumatic intelligent positioner C, the first pneumatic relay C2, the second pneumatic relay C3 and the pneumatic holding valve C1 are connected to a gas source, and the pressure of the gas source is 1.0 MPa (after purification, the impurity particles are less than 5 microns); the output signal interface of the pneumatic intelligent positioner C is connected to the control signal input end of the first pneumatic relay C2 and the control signal input end of the second pneumatic relay C3 respectively, the control signal output end of the first pneumatic relay C2 is connected to the first valve port of the pneumatic holding valve C1, and the control signal output end of the second pneumatic relay C3 is connected to the second valve port of the pneumatic holding valve C1; the third valve port of the pneumatic holding valve C1 is connected to the rod cavity of the cylinder body, and the fourth valve port of the pneumatic holding valve C1 is connected to the rodless cavity of the cylinder body.

[0143] In the embodiment, the pneumatic actuator is a double-acting pneumatic actuator, and the diameter of the cylinder body is DN500 mm.

[0144] In the embodiment, the first isolator B1 and the second isolator B2 are signal isolators of Weidmuller ACT20P-Cl-2CO type.

[0145] In the embodiment, the pneumatic holding valve is a pressure-sensitive holding valve of Fisher 377 type of FLSHER.

[0146] In the embodiment, the first pneumatic relay and the second pneumatic relay are pneumatic relays of 600-CA type of ControLAir.

[0147] In the embodiment, the magnetic hysteresis displacement sensor is a magnetic hysteresis displacement sensor of KYDM-LP1A4210-GC0180M1H03-W0-ASMS type produced by Kangyu Measurement and Control Instrument Co., Ltd. (other brands of magnetic hysteresis displacement sensors with the same function and form can also be used).

[0148] In the embodiment, the pneumatic intelligent positioner is an ABB EDP300-Y0H2F2DA1S3 type pneumatic intelligent valve positioner.

[0149] The control method of the large compressor pneumatic guide vane actuator based on the control system described in the embodiment is as follows:

[0150] 1) Actuator state detection;

[0151] Whether the cylinder is in a fully open state or a fully closed state is detected by the stroke position switch D2 arranged on the piston rod of the pneumatic actuator D, and the signal is transmitted to the compressor DCS control system.

[0152] The real-time position of the piston is detected by the hysteresis displacement sensor D1 arranged in the piston rod of the pneumatic actuator D, and the piston position signal is fed back to the pneumatic intelligent positioner C, which is converted into a signal that can be received by the pneumatic intelligent positioner C by the position signal conversion module C0, and then the pneumatic intelligent positioner C receives the signal and transmits the signal to the compressor DCS control system for display;

[0153] 7) Guide vane opening control;

[0154] The piston displacement instruction signal sent by the compressor DCS control system is sent to the control end of the pneumatic actuator D after amplification by the pneumatic intelligent positioner C, and the pneumatic actuator D is controlled to act to adjust the guide vane opening; the position holding function of the pneumatic position holding valve C1 (the gas path of the pneumatic position holding valve C1 is closed when the control system loses gas, ensuring that the piston of the cylinder is located at the position before the control system loses gas) is used to ensure that the action of the pneumatic actuator D is reliable and stable;

[0155] 3) Power supply;

[0156] The first DC voltage stabilizer A1 and the second DC voltage stabilizer A2 are used to convert 220V AC power into 24V DC power, and the power supply current and signal current are supplied to the pneumatic intelligent positioner C and the hysteresis displacement sensor D1; the redundant module A is used to realize the redundant supply of the two DC power supplies; the first isolator B1 and the second isolator B2 are used to realize the electrical isolation between the power supply system and the pneumatic intelligent positioner C, and the power supply system and the hysteresis displacement sensor D1, to ensure the safe operation of the system.

[0157] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A control system for a large compressor aerodynamic vane actuator, characterized by, The device comprises a pneumatic actuator, an actuator state detection system, a guide vane opening degree control system, an electrical isolation system, a power supply system and a terminal board. The pneumatic actuator is used for controlling the opening degree of the guide vane of a large compressor. The actuator state detection system is used for detecting the opening and closing state of the pneumatic actuator and the real-time position of the piston. The guide vane opening degree control system is used for transmitting the instruction of the DCS control system of the compressor and feeding back the execution condition of the instruction. The electrical isolation system is arranged between the power supply system and the actuator state detection system and between the power supply system and the guide vane opening degree control system, and is used for supplying power current and signal current to the actuator state detection system and the guide vane opening degree control system. The power supply system is used for converting 220V AC power supply into 24V DC power supply, and is a dual power supply redundant system. The pneumatic actuator is a double-acting pneumatic actuator, which comprises a cylinder body, a piston and a piston rod. The actuator state detection system comprises a stroke position switch and a magnetic displacement sensor.

2. A control system for a large compressor aerodynamic vane actuator characterized by, The stroke position switch is arranged on the piston rod and is used for detecting the fully open state and the fully closed state of the pneumatic actuator. The magnetic displacement sensor is arranged in the piston rod and is used for detecting the real-time position of the piston. The guide vane opening degree control system is a pneumatic intelligent positioner, which is provided with a signal conversion module, an input signal interface and an output signal interface. The electrical isolation system comprises a first isolator and a second isolator. The power supply system comprises a first DC voltage stabilizer, a second DC voltage stabilizer and a DC power supply redundancy module. The terminal board is provided with an AC power supply input interface, a first AC power supply output interface, a second AC power supply output interface, an input control signal interface, a position feedback signal output interface, a DC power supply input interface, a DC power supply output interface, a positioner signal interface and a sensor power supply interface. The driving end of the pneumatic intelligent positioner is connected with a gas source, and the pressure of the gas source is 1.0MPa. The output signal interface of the pneumatic intelligent positioner is connected with the control end of the pneumatic actuator through two control gas paths, one of which is connected with the rod cavity of the cylinder body, and the other of which is connected with the rodless cavity of the cylinder body. The device comprises a pneumatic actuator, an actuator state detection system, a guide vane opening degree control system, an electrical isolation system, a power supply system and a terminal board. The pneumatic actuator is used for controlling the opening degree of the guide vane of a large compressor. The actuator state detection system is used for detecting the opening and closing state of the pneumatic actuator and the real-time position of the piston. The guide vane opening degree control system is used for transmitting the instruction of the DCS control system of the compressor and feeding back the execution condition of the instruction. The electrical isolation system is arranged between the power supply system and the actuator state detection system and between the power supply system and the guide vane opening degree control system, and is used for supplying power current and signal current to the actuator state detection system and the guide vane opening degree control system. The power supply system is used for converting 220V AC power supply into 24V DC power supply, and is a dual power supply redundant system. The pneumatic actuator is a double-acting pneumatic actuator, which is composed of a cylinder body, a piston and a piston rod; the cylinder body has a diameter of DN500mm; The actuator state detection system is composed of a stroke position switch and a magnetic displacement sensor; the stroke position switch is arranged on the piston rod and is used for detecting the full open state and the full closed state of the pneumatic actuator; the magnetic displacement sensor is arranged in the piston rod and is used for detecting the real-time position of the piston; The guide vane opening degree control system is composed of a pneumatic intelligent positioner, a first pneumatic relay, a second pneumatic relay and a pneumatic holding valve; the pneumatic intelligent positioner is provided with a signal conversion module, an input signal interface and an output signal interface; the signal conversion module is used for converting the displacement signal of the magnetic displacement sensor into an electric parameter signal; The electrical isolation system comprises a first isolator and a second isolator; The power supply system comprises a first DC voltage stabilizer, a second DC voltage stabilizer and a DC power supply redundancy module; The wiring terminal board is provided with an AC power input interface, a first AC power output interface, a second AC power output interface, an input control signal interface, a position feedback signal output interface, a DC power input interface, a DC power output interface, a positioner signal interface and a sensor power interface; The output signal interface of the pneumatic intelligent positioner is connected to the control end of the pneumatic actuator through a control gas circuit; the control gas circuit is provided with the first pneumatic relay, the second pneumatic relay and the pneumatic holding valve; the driving ends of the pneumatic intelligent positioner, the first pneumatic relay, the second pneumatic relay and the pneumatic holding valve are connected to a gas source, and the pressure of the gas source is 1.0MPa; the output signal interface of the pneumatic intelligent positioner is connected to the control signal input end of the first pneumatic relay and the control signal input end of the second pneumatic relay; the control signal output end of the first pneumatic relay is connected to the first valve port of the pneumatic holding valve; the control signal output end of the second pneumatic relay is connected to the second valve port of the pneumatic holding valve; the third valve port of the pneumatic holding valve is connected to the rod cavity of the cylinder body; and the fourth valve port of the pneumatic holding valve is connected to the rodless cavity of the cylinder body.

3. A control system for a large compressor aerodynamic vane actuator according to claim 1 or 2, characterized in that, The AC power input interface of the wiring terminal board is connected to a 220V AC power source; the first AC power interface of the wiring terminal board is connected to the AC power input interface of the first DC voltage stabilizer; the second AC power interface of the wiring terminal board is connected to the AC power input interface of the second DC voltage stabilizer; the DC power output interface of the first DC voltage stabilizer and the DC power output interface of the second DC voltage stabilizer are respectively connected to the DC power input interface of the DC power supply redundancy module; the DC power output interface of the DC power supply redundancy module is connected to the DC power input interface of the wiring terminal board; and the DC power output interface of the wiring terminal board is connected to the power input interface of the first isolator and the power input interface of the second isolator. The position feedback signal output interface of the terminal block is connected with the feedback signal input end of the compressor DCS control system; the input control signal interface of the terminal block is connected with the control signal output end of the compressor DCS control system, and the input control signal interface of the terminal block is additionally connected with the input signal interface of the pneumatic intelligent positioner; the signal output interface of the magnetic displacement sensor is connected with the signal input interface of the second isolator, and the signal output interface of the second isolator is connected with the signal conversion module of the pneumatic intelligent positioner; the positive pole of the positioner signal interface of the terminal block is connected with the positive pole of the input signal interface of the first isolator, the negative pole of the input signal interface of the first isolator is connected with the negative pole of the output signal interface of the pneumatic intelligent positioner, and the positive pole of the output signal interface of the pneumatic intelligent positioner is connected with the negative pole of the positioner signal interface of the terminal block; the sensor power supply interface of the terminal block is connected with the power supply interface of the magnetic displacement sensor.

4. A control system for a large compressor aerodynamic vane actuator according to claim 1 or 2, wherein, The first isolator and the second isolator are ACT20P-Cl-2CO signal isolators of Weidmuller.

5. A control system for a large compressor aerodynamic vane actuator according to claim 1 or 2, wherein, The first DC voltage stabilizer and the second DC voltage stabilizer are 6EP3331-6SB00-0AY0 DC voltage stabilizers of SIEMENS; and the DC power supply redundancy module is PRO DM-10 DC power supply redundancy module of Weidmuller.

6. A control system for a large compressor aerodynamic vane actuator as defined in claim 2, wherein, The first pneumatic relay and the second pneumatic relay are 600-CA pneumatic relays of ControLAir; and the pneumatic hold valve is Fisher 377 pressure-sensitive hold valve of FLSHER.

7. A control system for a large compressor aerodynamic vane actuator according to claim 1 or 2, wherein, The magnetic displacement sensor is KYDM-LP1A4210-GC0180M1H03-W0-ASMS magnetostrictive displacement sensor of Kangyu.

8. A control system for a large compressor aerodynamic vane actuator according to claim 1 or 2, wherein, The pneumatic intelligent positioner is EDP300-Y0H2F2DA1S3 pneumatic intelligent valve positioner of ABB.

9. A control method for a large compressor gas dynamic vane actuator based on the control system of claim 1, characterized in that, The process comprises the following steps: 1) Actuator state detection; The stroke position switch arranged on the piston rod of the pneumatic actuator is used to detect whether the cylinder is in full open state or full closed state, and the signal is transmitted to the compressor DCS control system; The magnetic displacement sensor arranged in the piston rod of the pneumatic actuator is used to detect the real-time position of the piston, and the piston position, i.e. displacement signal, is fed back to the pneumatic intelligent positioner, which is converted into an electric parameter signal that can be received by the pneumatic intelligent positioner through the signal conversion module, and then the pneumatic intelligent positioner receives the signal and transmits the signal to the compressor DCS control system for display; 2) Guide vane opening control; The pneumatic intelligent positioner sends the piston displacement instruction signal sent by the compressor DCS control system to the control end of the pneumatic actuator, so as to control the pneumatic actuator to act and adjust the guide vane opening; 3) Power supply; The first DC power supply and the second DC power supply are used to convert 220V AC power into 24V DC power, and supply power current and signal current to the pneumatic intelligent positioner and the magnetic displacement sensor; the DC power supply redundancy module is used to realize the redundant supply of two DC power supplies; the first isolator and the second isolator are used to realize the electrical isolation between the power supply system and the pneumatic intelligent positioner and between the power supply system and the magnetic displacement sensor, and ensure the safe operation of the system.

10. A control method for a large compressor gas dynamic vane actuator based on the control system of claim 2, characterized in that, The method comprises the following processes: 1) Actuator state detection; The stroke position switch arranged on the piston rod of the pneumatic actuator is used to detect whether the cylinder is in the fully open state or the fully closed state, and the signal is transmitted to the compressor DCS control system; The magnetic displacement sensor arranged in the piston rod of the pneumatic actuator is used to detect the real-time position of the piston, and the piston position, i.e. the displacement signal, is fed back to the pneumatic intelligent positioner, which is converted into an electrical parameter signal that can be received by the pneumatic intelligent positioner by the signal conversion module, and then the pneumatic intelligent positioner receives the signal and transmits the signal to the compressor DCS control system for display; 3) Guide vane opening control; The pneumatic intelligent positioner sends the piston displacement instruction signal sent by the compressor DCS control system to the control end of the pneumatic actuator after amplification, controls the action of the pneumatic actuator to adjust the guide vane opening, and uses the hold function of the pneumatic hold valve to ensure that the action of the pneumatic actuator is reliable and stable; 3) Power supply; The first DC power supply and the second DC power supply are used to convert 220V AC power into 24V DC power, and supply power current and signal current to the pneumatic intelligent positioner and the magnetic displacement sensor; the DC power supply redundancy module is used to realize the redundant supply of two DC power supplies; the first isolator and the second isolator are used to realize the electrical isolation between the power supply system and the pneumatic intelligent positioner and between the power supply system and the magnetic displacement sensor, and ensure the safe operation of the system.

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