High-precision and high-reliability TRT static vane electro-hydraulic controller

Abstract

The utility model provides a kind of high-precision high reliability TRT stationary blade electro-hydraulic controller, including main electro-hydraulic control system and auxiliary electro-hydraulic control system, the main electro-hydraulic control system and auxiliary electro-hydraulic control system structure are same and backup each other, the utility model is in series by solenoid valve on the control loop of each proportional valve, and set its power condition is that "self-control signal is normal, valve position signal is normal, and the difference of both is in set range" three simultaneously satisfy, so that system can carry out real-time, accurate logic diagnosis to control loop state, once any condition is not satisfied, solenoid valve immediately loses power, rapidly isolates fault system from control chain physically, effectively prevent fault diffusion.At the same time, standby system in monitoring state all the time can instantaneously take over control right, since the oil line of main system and auxiliary system is parallel in advance, entire switching process does not need to change any hydraulic pipeline, realizes disturbanceless switching.

Description

Technical Field

[0001] This utility model mainly relates to the field of blast furnace smelting gas residual pressure energy recovery and power generation control technology, specifically a high-precision and high-reliability TRT stationary blade electro-hydraulic controller. Background Technology

[0002] In the metallurgical and chemical industries, blast furnace smelting is an essential step in production. The accuracy of blast furnace top pressure control directly affects the smooth operation and output of the blast furnace, making it a crucial control parameter. Under the backdrop of energy conservation and efficiency improvement, recovering residual pressure energy from blast furnaces for power generation is an important method of secondary energy recycling adopted by various countries.

[0003] In existing technologies, the electro-hydraulic control system of turbine TRT units has significant limitations. First, the system lacks an effective fault isolation mechanism. When control signals are abnormal or servo mechanisms deviate, the fault source cannot be quickly diagnosed and located, easily leading to the spread of the fault throughout the control system and seriously affecting production safety. Second, once a fault occurs, the system must be shut down for repair, which not only interrupts the normal production of the blast furnace but also causes huge economic losses. Third, the existing technology uses one electro-hydraulic converter to control two sets of parallel hydraulic circuits, making it difficult to achieve high-precision synchronous control. The two servo cylinders are prone to cumulative deviations during frequent and rapid adjustments. This asynchronous operation generates huge mechanical torque and pipeline vibration, which can lead to metal fatigue in the long run, significantly shortening the service life of the equipment and severely restricting the efficiency and reliability of the equipment. Utility Model Content

[0004] This utility model mainly provides a high-precision and high-reliability TRT stator electro-hydraulic controller to solve the technical problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A high-precision, high-reliability TRT stator vane electro-hydraulic controller includes a main electro-hydraulic control system and an auxiliary electro-hydraulic control system. The main and auxiliary electro-hydraulic control systems have identical structures and serve as backups for each other, monitoring each other's operating status. Both the main and auxiliary electro-hydraulic control systems are connected to a central control room to receive control signals and provide feedback on status information. Each of the main and auxiliary electro-hydraulic control systems includes two PID controllers, one comparator, two proportional valves, two position sensors, and a power supply. The main and auxiliary electro-hydraulic control systems further include at least two solenoid valves, with one solenoid valve connected in series in the control loop of each proportional valve.

[0006] Preferably, the solenoid valve is configured to: receive an automatic control status signal from the central control room, and, based on the logical judgment result of the automatic control signal, the valve position signal and their difference, connect or disconnect the control circuit of the corresponding proportional valve.

[0007] Preferably, the automatic control signal is normal, the valve position signal is normal, and the difference between the automatic control signal and the valve position signal is within the set range. If any one of these three conditions is not met, the solenoid valve is de-energized and the system enters a self-locking state.

[0008] Preferably, the proportional valves in the main electro-hydraulic control system and the auxiliary electro-hydraulic control system are connected in parallel to the control oil circuit of the same servo cylinder via solenoid valves. When the main electro-hydraulic control system fails and locks itself, its solenoid valve cuts off the control circuit of the proportional valve in the main electro-hydraulic control system. At the same time, the solenoid valve in the auxiliary electro-hydraulic control system remains open, and the auxiliary electro-hydraulic control system takes over the control without switching the oil circuit.

[0009] Preferably, the PID controller and comparator are Siemens S7-200 series PLC controllers, and the system signal transmission range is 4~20mA.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By connecting a solenoid valve in series in the control loop of each proportional valve, and setting its energization condition to simultaneously satisfy "normal self-control signal, normal valve position signal, and the difference between the two within a set range," the system can perform real-time and accurate logical diagnosis of the control loop status. If any condition is not met, the solenoid valve immediately loses power, quickly and physically isolating the faulty system from the control chain, effectively preventing the fault from spreading. Simultaneously, the standby system, which is always under monitoring, can instantly take over control. Because the oil circuits of the main and auxiliary systems are pre-connected in parallel, the entire switching process requires no modification to any hydraulic pipelines, achieving a seamless switching and greatly ensuring the continuity of blast furnace production and the reliability of the entire control system.

[0011] 2. By using a position sensor and a PID controller to form a "first closed-loop" control for the displacement of a single servo cylinder, a control accuracy better than 0.2% is achieved. Then, by using a comparator to compare the movement speeds of the two cylinders in real time and dynamically adjusting their control signals, a "second closed-loop" synchronous control is formed to ensure the coordinated operation of the two actuators, achieving a synchronization accuracy better than ±1.5%. This ensures extreme stability of the furnace top pressure, improving power generation efficiency. Furthermore, it fundamentally eliminates the mechanical torque and pipeline vibration caused by the asynchrony of the two servo cylinders, significantly reducing fatigue wear on key mechanical components of the TRT unit. Thus, while improving control quality, it greatly enhances the safety and service life of the equipment.

[0012] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] In the diagram, the following labels are used: DSC - Central Control Room; PID1, PID2, PID3, PID4 - PID Controllers; C1, C2 - Comparators; F1, F2, F3, F4 - Signal Amplifiers; DV1, DV2, DV3, DV4 - Solenoid Valves; SF1, SF2, SF3, SF4 - Proportional Valves; SGA, SGB - Servo Cylinders; A, B, C, D - Position Sensors. Detailed Implementation

[0015] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive. Example

[0016] Please refer to the appendix carefully. Figure 1 A high-precision, high-reliability TRT stator vane electro-hydraulic controller includes a main electro-hydraulic control system and an auxiliary electro-hydraulic control system. The main electro-hydraulic control system is specifically configured with two PID controllers (PID1, PID2) and a comparator C1, all implemented using Siemens S7-200 series PLC controllers. Two position sensors (A, B) are mechanically connected to two servo cylinders (SGA, SGB) of the turbine TRT unit, respectively, for real-time detection of cylinder displacement and velocity. The output terminals of sensors A and B are electrically connected to the signal input terminals of PID1 and PID2, respectively, transmitting the collected position and velocity signals to the corresponding PID controllers. The control input terminals of ID1 and PID2 are connected to the DCS in the central control room to receive control commands. Their control output terminals are connected in sequence to signal amplifiers (F1, F2) and solenoid valves (DV1, DV2). The solenoid valves (DV1, DV2) are connected in series in the control loop, and their output terminals are finally connected to the control coils of proportional valves (SF1, SF2). The proportional valves (SF1, SF2) are installed in the hydraulic circuit, and their output ports are connected to the oil inlets of servo cylinders (SGA, SGB) to control the movement of the cylinders. The communication ports of PID1 and PID2 are connected to comparator C1, which sends the servo cylinder motion parameters processed by each to C1 for real-time comparison and calculation.

[0017] The auxiliary electro-hydraulic control system is symmetrical with the main electro-hydraulic control system, including: PID controllers (PID3, PID4), comparator C2, signal amplifiers (F3, F4), solenoid valves (DV3, DV4), proportional valves (SF3, SF4), and position sensors (C, D). The connection relationship of the auxiliary electro-hydraulic control system is the same as that of the main electro-hydraulic control system: sensors C and D are connected to SGA and SGB; PID3 and PID4 receive DCS commands and are connected to C2; the output is amplified by F3 and F4 and switched on and off by DV3 and DV4 to drive SF3 and SF4.

[0018] The proportional valve SF1 of the main electro-hydraulic control system and the proportional valve SF3 of the auxiliary electro-hydraulic control system are connected in parallel through their respective solenoid valves (DV1, DV3) and then connected together to the control oil circuit of the servo cylinder SGA. Similarly, SF2 and SF4 are connected in parallel through DV2 and DV4 and then connected together to the SGB. An independent power supply system supplies power to all electrical components of the entire controller.

[0019] The specific operation method of this utility model is as follows: During normal operation, the main electro-hydraulic control system operates. The solenoid valves (DV1, DV2) are energized when the automatic control signal and valve position signal are normal and their difference is within the allowable tolerance range. This allows the DCS control commands to drive the servo cylinders (SGA, SGB) through the proportional valves (SF1, SF2). Position sensors (A, B) provide real-time feedback of cylinder position and speed to PID1 and PID2. The PID controllers perform calculations and output control signals, while simultaneously sending the data to comparator C1. C1 compares the movement speeds of the two cylinders and dynamically sends a suppression signal to the faster-moving loop and an acceleration signal to the slower-moving loop, ensuring that the synchronization accuracy of SGA and SGB is better than ±1.5%, the overall system control accuracy is better than 0.2%, and the position control accuracy is better than 1 / 1000.

[0020] When the main electro-hydraulic control system malfunctions (any of SP, PV, or ΔV exceeds the tolerance), solenoid valves DV1 and DV2 immediately lose power, cutting off the control circuit of the main electro-hydraulic control system and causing it to self-lock. At this time, the auxiliary electro-hydraulic control system, which is under monitoring, detects the fault in the main electro-hydraulic control system. Its solenoid valves DV3 and DV4 remain in or switch to the conducting state under logic control, immediately and seamlessly taking over the control of the servo cylinders SGA and SGB without any oil circuit switching. Maintenance personnel can perform online maintenance on the locked main electro-hydraulic control system. After repair, it stands by as a new backup system, thus achieving high-reliability control without interrupting production.

[0021] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A high-precision, high-reliability TRT stator vane electro-hydraulic controller, comprising a main electro-hydraulic control system and an auxiliary electro-hydraulic control system, characterized in that: The main electro-hydraulic control system and the auxiliary electro-hydraulic control system have the same structure and serve as backups for each other, and monitor each other's operating status. Both the main electro-hydraulic control system and the auxiliary electro-hydraulic control system are connected to the central control room to receive control signals and provide feedback on status information. Both the main electro-hydraulic control system and the auxiliary electro-hydraulic control system include two PID controllers, one comparator, two proportional valves, two position sensors, and a power supply. The main electro-hydraulic control system and the auxiliary electro-hydraulic control system also include at least two solenoid valves, with one solenoid valve connected in series in the control loop of each proportional valve.

2. The high-precision, high-reliability TRT stator vane electro-hydraulic controller according to claim 1, characterized in that, The solenoid valve is configured to receive the automatic control status signal from the central control room, and based on the logical judgment result of the automatic control signal, the valve position signal and their difference, to open or close the control circuit of the corresponding proportional valve.

3. A high-precision, high-reliability TRT stator vane electro-hydraulic controller according to claim 1, characterized in that, The solenoid valve is energized under the following conditions: the self-control signal is normal, the valve position signal is normal, and the difference between the self-control signal and the valve position signal is within a set range. If any one of these three conditions is not met, the solenoid valve is de-energized and the system enters a self-locking state.

4. A high-precision, high-reliability TRT stator vane electro-hydraulic controller according to claim 1, characterized in that, The proportional valves in the main electro-hydraulic control system and the auxiliary electro-hydraulic control system are connected in parallel to the control oil circuit of the same servo cylinder through solenoid valves. When the main electro-hydraulic control system fails and locks itself, its solenoid valve cuts off the control circuit of the proportional valve of the main electro-hydraulic control system. At the same time, the solenoid valve in the auxiliary electro-hydraulic control system remains open, and the auxiliary electro-hydraulic control system takes over the control without switching the oil circuit.

5. A high-precision, high-reliability TRT stator vane electro-hydraulic controller according to claim 1, characterized in that, The PID controller and comparator are Siemens S7-200 series PLC controllers, and the system signal transmission range is 4~20mA.

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