Trt vane control device

Abstract

This application relates to a TRT stationary blade control device, comprising: a control valve, a control valve servo controller, a control valve electro-hydraulic servo valve, a stationary blade position sensor, and a TRT unit control system. The TRT stationary blade control device of this application can effectively limit the TRT stationary blade opening within the safe and efficient range, while not affecting the safety and stability of the TRT stationary blade's control over the blast furnace top pressure. The core of this stationary blade control device is to improve TRT power generation efficiency and extend TRT blade life. The control loop of this TRT stationary blade control device can be perfectly integrated with the existing blast furnace top pressure PID control loop. Furthermore, when the TRT stationary blade is operating within the safe and efficient range, this TRT stationary blade control loop is only in an online monitoring state; it only activates when the TRT stationary blade leaves the safe and efficient range.

Description

Technical Field

[0001] This application relates to the field of waste pressure and waste heat power generation technology, specifically to a TRT stationary blade control device. Background Technology

[0002] The Blast Furnace Top Gas Recovery Turbine Unit (TRT) utilizes the high-temperature, high-pressure blast furnace gas, a byproduct of blast furnace smelting. The gas drives a gas turbine to generate electricity, converting the kinetic and potential energy of the gas into mechanical energy, which is then converted into electrical energy for storage or grid connection. This achieves the secondary utilization of the residual pressure and temperature of the blast furnace gas and is now considered an environmentally friendly product promoted by energy conservation, emission reduction, and the CDM (Clean Development Mechanism).

[0003] Blast furnace top pressure is a crucial control parameter in the normal production process of blast furnace smelting. Its stability directly affects the safety, stability, and output of the blast furnace. Typically, if the smelting process does not include a pressure-reducing valve (TRT) system, the blast furnace top pressure is regulated by a pressure-reducing valve assembly. If a TRT system is installed, the blast furnace top pressure is regulated by the TRT itself, specifically by the TRT stationary vanes. Therefore, the TRT not only plays a vital role in generating electricity from residual gas pressure and temperature but also in ensuring the stability, safety, and high-precision regulation of the blast furnace top pressure.

[0004] During normal blast furnace production, the TRT (Transmission Reduction Unit) scale is uniquely matched to the gas pressure and gas generation during normal blast furnace production, ensuring that the TRT stationary blades always operate within the safe and efficient range. If the blast furnace needs to reduce production for some reason, the blast furnace top pressure and blast furnace gas generation will decrease significantly. Alternatively, if blast furnace production is unstable, the blast furnace top pressure will fluctuate considerably. To ensure that the blast furnace top pressure meets production requirements and remains stable, the TRT stationary blade opening will be significantly reduced. In this case, the TRT stationary blade opening will remain outside the safe and efficient range. As the stationary blade opening decreases, the power generation efficiency will drop significantly. Simultaneously, due to the smaller stationary blade opening, the gas velocity flowing through the stationary blades will increase, creating a high-speed scouring effect on the TRT blades. Since blast furnace gas itself contains a large amount of dust particles and acidic substances, high-speed scouring easily leads to blade wear, corrosion, and breakage, reducing blade lifespan. Summary of the Invention

[0005] In order to overcome at least one deficiency in the prior art, this application provides a TRT stationary blade control device.

[0006] In a first aspect, a TRT stationary vane control device is provided, comprising: a control valve, a control valve servo controller, a control valve electro-hydraulic servo valve, a stationary vane position sensor, and a TRT unit control system;

[0007] The stationary blade position sensor is used to acquire the opening measurement value of the TRT stationary blade and send the stationary blade opening measurement value to the TRT unit control system;

[0008] When the measured value of the stationary vane opening is less than the first set value α, the TRT unit control system sends a valve closing command signal to the control valve servo controller. After receiving the valve closing command signal, the control valve servo controller controls the control valve to close the valve through the electro-hydraulic servo valve until the measured value of the stationary vane opening is not less than the first set value α. At this point, the valve closing action of the control valve stops and the control valve is in the position holding state.

[0009] When the measured value of the stationary vane opening is greater than the second set value θ, the TRT unit control system sends a valve opening command signal to the control valve servo controller. After receiving the valve opening command signal, the control valve servo controller controls the control valve to open through the control valve electro-hydraulic servo valve. If the measured value of the stationary vane opening is not less than the second set value θ, the valve opening operation continues until the control valve is fully open. If the measured value of the stationary vane opening is less than the second set value θ during the valve opening process, the valve opening action of the control valve stops, and the control valve is in a position-holding state. If the measured value of the stationary vane opening is less than the first set value α during the valve opening process, the valve closing operation is performed when the measured value of the stationary vane opening is less than the first set value α.

[0010] In one embodiment, the first set value α and the second set value θ satisfy the following relationship: 2α≥θ≥1.3α.

[0011] In one embodiment, the valve closing rate A and the valve opening rate B of the control valve satisfy the following relationship: TRT stationary vane adjustment rate > valve closing rate A > valve opening rate B.

[0012] In one embodiment, the TRT stationary vane adjustment rate is equal to 3 to 10 times the valve closing rate A, and the valve closing rate A is equal to 1 to 5 times the valve opening rate B.

[0013] Secondly, a blast furnace top pressure PID control device is provided, comprising: a blast furnace top pressure PID control loop and a TRT stationary blade control device; the TRT stationary blade control device is the TRT stationary blade control device according to the above.

[0014] In one embodiment, the blast furnace top pressure PID control loop includes a stationary vane servo controller, a stationary vane electro-hydraulic servo valve, a TRT stationary vane actuator, and a blast furnace top pressure sensor.

[0015] The blast furnace top pressure sensor is used to acquire the measured value of the blast furnace top pressure;

[0016] The TRT unit control system compares the blast furnace top pressure setpoint and the blast furnace top pressure measured value in real time, and determines the required opening value of the TRT stationary blades based on the comparison result. The TRT unit control system outputs the required opening value of the TRT stationary blades to the stationary blade servo controller as the stationary blade opening setpoint of the stationary blade servo controller.

[0017] The stationary vane servo controller compares the stationary vane opening setpoint with the stationary vane opening measurement value fed back by the stationary vane position sensor in real time, and determines the stationary vane opening change value based on the comparison result. The stationary vane servo controller outputs the stationary vane opening change value to the stationary vane electro-hydraulic servo valve.

[0018] The stationary vane electro-hydraulic servo valve controls the power oil to drive the stationary vane actuator, so that the opening change of the TRT stationary vane reaches the stationary vane opening change value, thereby controlling the blast furnace top pressure.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] 1. The TRT stationary blade control device of this application can effectively limit the opening degree of the TRT stationary blade within the safe and efficient range, while not affecting the safety and stability of the blast furnace top pressure control, thereby improving the TRT power generation efficiency and extending the life of the TRT blade.

[0021] 2. The control loop of this application is set independently and can be perfectly integrated with the existing PID control loop of blast furnace top pressure. When the TRT stationary blade is running in the safe and efficient zone, the control loop of this application is only in the online monitoring state. The control loop of this application will only take effect in time when the TRT stationary blade leaves the safe and efficient zone. Attached Figure Description

[0022] This application can be better understood by referring to the description given below in conjunction with the accompanying drawings, which, together with the detailed description below, are incorporated in and form part of this specification. In the drawings:

[0023] Figure 1 A typical TRT efficiency curve is shown;

[0024] Figure 2 A flow chart of the TRT process system for a gas turbine is shown.

[0025] Figure 3 The PID control loop diagram for blast furnace top pressure is shown. Detailed Implementation

[0026] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of the actual embodiments are described in the specification. However, it should be understood that many embodiment-specific decisions can be made in the development of any such actual embodiment to achieve the developer’s specific objectives, and these decisions may vary as the embodiments differ.

[0027] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the device structure closely related to the solution according to this application is shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0028] It should be understood that this application is not limited to the described embodiments by virtue of the following description with reference to the accompanying drawings. In this document, embodiments may be combined with each other, features may be substituted or borrowed between different embodiments, and one or more features may be omitted in one embodiment, where feasible.

[0029] Figure 1 A typical TRT efficiency curve is shown; see [link / reference]. Figure 1 When the TRT stationary blade opening is below 50%, the power generation efficiency drops significantly. This is often due to factors such as blast furnace production cuts and blast furnace drying, which cause the TRT stationary blade opening to fall below 50%, and frequently even below 20%. Therefore, controlling the TRT stationary blade opening within the high-efficiency range can significantly improve power generation efficiency, achieving energy conservation and emission reduction.

[0030] Figure 2 A flow chart of the TRT process system for a gas turbine is shown. (See attached diagram) Figure 2 Blast furnace gas, a byproduct of blast furnace ironmaking, is drawn out through a large pipeline and simultaneously connected to a pressure reducing valve group (SV) and a gas turbine generator (TRT). Before the TRT is put into operation, the blast furnace top pressure is controlled by the pressure reducing valve group. After the TRT is put into operation, the pressure reducing valve group is fully closed, and the blast furnace top pressure is completely controlled by the TRT stationary vanes. The TRT simultaneously undertakes the dual tasks of controlling the blast furnace top pressure and generating electricity from blast furnace gas. Previous TRT process systems did not include a control valve (TCV), but the control method of this application requires a control valve (TCV) at the TRT inlet. Here, the control valve TCV is a regulating butterfly valve, which offers good regulating performance, high precision, fast response speed, and proximity to the TRT inlet.

[0031] Figure 3 The PID control loop diagram for blast furnace top pressure is shown below. Figure 3The blast furnace top pressure PID control device includes: a blast furnace top pressure PID control loop and the TRT stationary blade control device of this application. Here, when the TRT stationary blade is operating in the safe and efficient zone, the TRT stationary blade control device of this application is only in an online monitoring state. The TRT stationary blade control device of this application will only act in a timely manner when the TRT stationary blade leaves the safe and efficient zone. The TRT stationary blade control device of this application is used to control the TRT stationary blade to be limited within the safe and efficient zone, while not affecting the safety and stability of the blast furnace top pressure PID control loop, thereby improving the TRT power generation efficiency and extending the life of the TRT blade.

[0032] In one embodiment, the TRT stator control device includes: a control valve (TCV), a control valve servo controller (ZC2), a control valve electro-hydraulic servo valve (ZV2), a stator position sensor, and a TRT unit control system; the stator position sensor is used to acquire the stator opening measurement value of the TRT stator and send the stator opening measurement value to the TRT unit control system.

[0033] When the measured value of the stationary vane opening is less than the first set value α, the TRT stationary vane is outside the safe and efficient zone. The TRT unit control system sends a valve closing command signal to the control valve servo controller (ZC2). After receiving the valve closing command signal, the control valve servo controller (ZC2) controls the control valve (TCV) to close the valve through the control valve electro-hydraulic servo valve (ZV2) until the measured value of the stationary vane opening is not less than the first set value α. At this point, the valve closing action of the control valve stops, and the control valve is in the position holding state.

[0034] When the measured value of the stationary vane opening is greater than the second set value θ, the TRT unit control system sends a valve opening command signal to the control valve servo controller (ZC2). After receiving the valve opening command signal, the control valve servo controller (ZC2) controls the control valve (TCV) to open through the control valve electro-hydraulic servo valve (ZV2). If the measured value of the stationary vane opening is not less than the second set value θ, the valve opening operation continues until the control valve (TCV) is fully open. If the measured value of the stationary vane opening is less than the second set value θ during the valve opening process, the valve opening action of the control valve (TCV) stops, and the control valve (TCV) is in a position-holding state. If the measured value of the stationary vane opening is less than the first set value α during the valve opening process, the valve closing operation is performed when the measured value of the stationary vane opening is less than the first set value α.

[0035] Here, the selection of the α value mainly involves conducting flow field numerical simulation and coupled vibration analysis of the TRT under different stator blade openings to check whether there is significant airflow separation, eddy current loss, and performance degradation in its flow characteristics. Based on the coupled vibration analysis results, the airflow force excitation frequency under different openings is calculated to identify the opening values ​​that may cause blade resonance failure. At the same time, referring to the efficiency curve, the α value is selected in the region where efficiency decreases significantly, thus finally determining the opening value of α, which can be 20% to 40%.

[0036] In the above embodiments, the TRT stationary blade control device controls the opening and closing of the control valve based on the stationary blade opening measurement value, which can effectively limit the TRT stationary blade opening within the safe and efficient range, while not affecting the safety and stability of the blast furnace top pressure control, thereby improving the TRT power generation efficiency and extending the TRT blade life.

[0037] Furthermore, in order to prevent the control valve from oscillating within the α and θ adjustment range, the first setpoint α and the second setpoint θ satisfy the following relationship: 2α ≥ θ ≥ 1.3α; here, the units of α and θ are percentages or angles, and according to the efficiency curve, we usually use percentages.

[0038] Furthermore, the valve closing rate A and the valve opening rate B of the control valve satisfy the following relationship: TRT stationary vane adjustment rate > valve closing rate A > valve opening rate B.

[0039] Furthermore, the TRT stationary vane adjustment rate is 3 to 10 times the valve closing rate A, and the valve closing rate A is 1 to 5 times the valve opening rate B. Here, the units of valve closing rate A and valve opening rate B are opening degrees per second.

[0040] Specifically, the blast furnace top pressure PID control loop includes a stationary vane servo controller, a stationary vane electro-hydraulic servo valve, a stationary vane actuator, and a blast furnace top pressure sensor; see [link to relevant documentation]. Figure 3 The blast furnace top pressure setpoint SP comes from the blast furnace DCS control system, and the blast furnace top pressure measured value PV, which is fed back from the blast furnace top pressure sensor installed on the blast furnace top, comes from the blast furnace top pressure sensor. The TRT unit control system compares the blast furnace top pressure setpoint SP and the blast furnace top pressure measured value PV in real time, and calculates the comparison result to obtain the opening value that the TRT stationary vane needs to achieve. The TRT unit control system outputs the opening value that the TRT stationary vane needs to achieve to the stationary vane servo controller (ZC1) as the stationary vane opening setpoint of the stationary vane servo controller.

[0041] The stationary vane servo controller (ZC1) compares the stationary vane opening setpoint with the stationary vane opening measurement value fed back by the stationary vane position sensor in real time. It calculates the stationary vane opening change value based on the comparison result. The stationary vane servo controller outputs the stationary vane opening change value to the stationary vane electro-hydraulic servo valve ZV1 on the stationary vane hydraulic valve platform. The stationary vane electro-hydraulic servo valve ZV1 controls the power oil to drive the stationary vane actuator, so that the opening change of the TRT stationary vane reaches the stationary vane opening change value, thereby achieving the purpose of controlling the blast furnace top pressure.

[0042] In summary, this application effectively avoids the phenomenon of TRT stationary blades deviating from the safe and efficient operating zone when blast furnace gas pressure and gas generation decrease. Through practice, it has been proven that this application effectively improves the power generation efficiency of TRT units and enhances the safety production coefficient of TRT units, which is of great significance to blast furnace smelting technology in the metallurgical field.

[0043] The above descriptions are merely various embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A TRT stator blade control device, characterized in that, include: Control valves, control valve servo controllers, control valve electro-hydraulic servo valves, stationary vane position sensors, TRT unit control systems; The stationary blade position sensor is used to acquire the opening measurement value of the TRT stationary blade and send the stationary blade opening measurement value to the TRT unit control system; When the measured value of the stationary vane opening is less than the first set value α, the TRT unit control system sends a valve closing command signal to the control valve servo controller; after receiving the valve closing command signal, the control valve servo controller controls the control valve to close the valve through the control valve electro-hydraulic servo valve until the measured value of the stationary vane opening is not less than the first set value α, at which point the valve closing action of the control valve stops and the control valve is in a position holding state. When the measured value of the stationary vane opening is greater than the second set value θ, the TRT unit control system sends a valve opening command signal to the control valve servo controller; after receiving the valve opening command signal, the control valve servo controller controls the control valve to open through the control valve electro-hydraulic servo valve. If the measured value of the stationary vane opening is not less than the second set value θ, the valve opening operation continues until the control valve is fully open. If the measured value of the stationary vane opening is less than the second set value θ during the valve opening process, the valve opening action of the control valve stops and the control valve is in the position holding state; if the measured value of the stationary vane opening is less than the first set value α during the valve opening process, the valve closing operation is performed when the measured value of the stationary vane opening is less than the first set value α. The first set value α and the second set value θ satisfy the following relationship: 2α≥θ≥1.3α.

2. The apparatus as claimed in claim 1, characterized in that, The valve closing rate A and the valve opening rate B of the control valve satisfy the following relationship: TRT stationary vane adjustment rate > valve closing rate A > valve opening rate B.

3. The apparatus as described in claim 1, characterized in that, The TRT stationary vane regulating rate is 3 to 10 times the valve closing rate A, and the valve closing rate A is 1 to 5 times the valve opening rate B.

4. A PID control device for blast furnace top pressure, characterized in that, include: A PID control loop for blast furnace top pressure and a TRT stationary blade control device; the TRT stationary blade control device is the TRT stationary blade control device according to any one of claims 1-3.

5. The apparatus as described in claim 4, characterized in that, The blast furnace top pressure PID control loop includes a stationary vane servo controller, a stationary vane electro-hydraulic servo valve, a TRT stationary vane actuator, and a blast furnace top pressure sensor. The blast furnace top pressure sensor is used to acquire the measured value of the blast furnace top pressure. The TRT unit control system compares the blast furnace top pressure setpoint and the blast furnace top pressure measured value in real time, and determines the required opening value of the TRT stationary blades based on the comparison result. The TRT unit control system outputs the required opening value of the TRT stationary blades to the stationary blade servo controller as the stationary blade opening setpoint of the stationary blade servo controller. The stationary vane servo controller compares the stationary vane opening setpoint and the stationary vane opening measurement value fed back by the stationary vane position sensor in real time, and determines the stationary vane opening change value based on the comparison result. The stationary vane servo controller outputs the stationary vane opening change value to the stationary vane electro-hydraulic servo valve. The electro-hydraulic servo valve controls the power oil to drive the stationary blade actuator, so that the opening change of the TRT stationary blade reaches the stationary blade opening change value, thereby controlling the blast furnace top pressure.

Images