Monitoring method for steam turbine power generation system

Abstract

The present invention provides a monitoring method for a steam turbine power generation system, the monitoring method comprising collecting vibration information of a turbine; determining whether the vibration information indicates abnormal vibration of the turbine; in response, collecting speed information of a rotor of the turbine; determining whether the speed information exceeds a preset speed range; in response, adjusting the opening of an inlet pipe of the turbine. This embodiment determines whether the operating state of the turbine is normal through vibration information. If the turbine is operating abnormally. Next, determine whether the speed of the rotor of the turbine exceeds the preset speed range, adjust the steam pressure by adjusting the opening of the inlet pipe of the turbine, and thus adjust the speed of the rotor. In this way, the vibration of the turbine can be reduced, the turbine can operate stably, and the maintenance cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and in particular to a monitoring method for a steam turbine power generation system. Background Art

[0002] A steam turbine power generation system is a power generation system that converts the thermal energy of steam into mechanical energy to generate electrical energy. Specifically, steam enters the turbine through a pipeline, and the flow of steam can cause the turbine blades to rotate, thereby driving the generator to generate electricity.

[0003] During use, if the rotation speed of the turbine exceeds a preset range, it will usually cause vibration of the turbine, which will affect the power generation efficiency of the power generation system and increase the maintenance cost of the turbine. Summary of the invention

[0004] The content of the present invention is used to introduce the concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of the present disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] Some embodiments of the present invention provide a monitoring method for a steam turbine power generation system to solve the technical problems mentioned in the above background technology section.

[0006] The monitoring method includes collecting vibration information of a turbine, wherein the vibration information includes vibration amplitude and vibration frequency; determining whether the vibration information indicates abnormal vibration of the turbine; in response, collecting speed information of a rotor of the turbine; determining whether the speed information exceeds a preset speed range; in response, adjusting the opening of an inlet pipe of the turbine.

[0007] The above embodiments of the present invention have the following beneficial effects: through the monitoring method for a steam turbine power generation system of the present invention, the rotor operation state of the turbine can be monitored and adjusted. Specifically, firstly, whether the operation state of the turbine is normal is determined through vibration information.

[0008] If the operating state of the turbine is abnormal, the next step is to determine whether the speed of the turbine rotor exceeds the preset speed range. The reason is that too low or too high steam pressure usually causes the turbine to vibrate. Therefore, the steam pressure is adjusted by adjusting the opening of the turbine inlet pipe to adjust the speed of the rotor. In this way, the vibration of the turbine can be reduced, the turbine can run stably, and the maintenance cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 Flow charts of some embodiments of the monitoring method for a steam turbine power generation system of the present invention;

[0011] Figure 2 Flow charts of other embodiments of the monitoring method for a steam turbine power generation system of the present invention;

[0012] Figure 3 It is a schematic diagram of the preset speed range, the low value buffer zone, and the high value buffer zone of the present invention. DETAILED DESCRIPTION

[0013] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0015] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0017] See also Figure 1 and Figure 2 , Figure 1 Flow charts of some embodiments of the monitoring method for a steam turbine power generation system of the present invention; Figure 2 Flow charts of other embodiments of the monitoring method for a steam turbine power generation system of the present invention. Figure 1 and Figure 2 As shown, the monitoring method comprises the following steps:

[0018] Step 101: Collect vibration information of the turbine.

[0019] In some embodiments, the execution subject of the monitoring method may be a control terminal, which may be a microcontroller or a PLC (Programmable Logic Controller). A vibration sensor may be provided on the turbine to detect vibration information of the turbine, and the vibration information may include vibration amplitude and vibration frequency. The control terminal may be connected to the vibration sensor for communication, and the control terminal may receive vibration information collected by the vibration sensor.

[0020] In addition, the sound signal of the turbine can also be collected by a microphone or a sound sensor, and the sound signal can be filtered to remove background noise to improve the quality of the sound signal. Next, feature values ​​can be extracted from the sound signal by spectrum analysis or voiceprint analysis. The feature values ​​can include the vibration amplitude and vibration frequency included in the sound signal. Step 102: Determine whether the vibration information represents abnormal vibration of the turbine.

[0021] In some embodiments, a preset vibration threshold may be stored in the control terminal, and the preset vibration threshold may be a threshold of vibration amplitude or vibration frequency. The threshold value may be determined by those skilled in the art through repeated experiments based on the parameters of the turbine.

[0022] The control end can compare the vibration amplitude or vibration frequency represented by the vibration information with the preset vibration threshold to determine whether it exceeds the preset vibration threshold. If it does not exceed the preset vibration threshold, it indicates that the turbine is operating normally.

[0023] The above-mentioned vibration amplitude and vibration frequency can also be analyzed through artificial intelligence and deep learning algorithms. For example, the vibration amplitude and vibration frequency of the collected sound signal can be compared with the historical sound signal of normal operation of the turbine through a probabilistic linear discriminant analysis model to determine whether the operation of the turbine is abnormal.

[0024] Step 103: In response to this, the rotation speed information of the turbine rotor is collected.

[0025] In some embodiments, if the turbine vibration is abnormal, the control end collects the speed information of the turbine rotor. Specifically, a photoelectric encoder, a magnetic sensor or a tachometer can be set in the turbine to collect the speed of the rotor.

[0026] Step 104: Determine whether the rotation speed information exceeds a preset rotation speed range.

[0027] In some embodiments, a preset speed range may be stored in the control end, and the size of the preset speed range may be determined by a person skilled in the art through repeated experiments based on the parameters of the turbine. The control end compares the speed represented by the speed information with the preset speed range to determine whether it exceeds the preset speed range.

[0028] In some optional implementations of some embodiments, if the speed does not exceed the preset speed range, it indicates that the rotor speed of the turbine is normal. However, if the vibration of the turbine is abnormal, the control end can send a fault alarm to a display screen that is communicatively connected to the control end, thereby reminding the staff to inspect the rotor bearing of the turbine.

[0029] Step 105: In response to then, adjusting the opening of the turbine inlet duct.

[0030] In some embodiments, when the speed exceeds the preset speed range, it indicates that the steam pressure is too high or too low, causing the turbine to vibrate, and then adjusting the opening of the turbine inlet pipe and adjusting the steam pressure so that the speed is within the preset speed range. Specifically, an electric regulating valve can be provided on the turbine inlet pipe, and the electric regulating valve can be communicatively connected to the control end.

[0031] Specifically, when the speed exceeds the upper value of the preset speed range, the electric regulating valve opening can be increased to reduce the steam pressure and lower the speed. Finally, the vibration information of the turbine is collected again, and this process is repeated.

[0032] When the speed is lower than the lower value of the preset speed range, the opening of the electric control valve can be reduced to increase the steam pressure and increase the speed. Finally, the vibration information of the turbine is collected again, and this process is repeated until the vibration information indicates that the turbine is operating normally.

[0033] In order to make the electric control valve able to reasonably adjust the opening, the following Figure 3 Provide explanation. Figure 3 Schematic diagram of the preset speed range, low value buffer zone, and high value buffer zone of the present invention. Figure 3 As shown, first, the process of increasing the opening of the electric control valve when the speed is higher than the high value of the preset speed range is explained.

[0034] First, determine the buffer high value, which together with the preset speed range high value constitutes a high value buffer zone. As an example, the preset speed range may be 2000-3000RPM, and the preset speed range high value is 3000RPM. The buffer high value may be set to 4000RPM, and the high value buffer zone is 3000RPM-4000RPM.

[0035] Next, when the speed is higher than the buffer high value, it indicates that the speed is too fast and the speed should be reduced as soon as possible. Therefore, the opening of the electric control valve can be continuously increased so that the speed enters the high value buffer zone.

[0036] When the speed is in the high value buffer, the opening is gradually adjusted with a preset opening increment. After each adjustment with a preset opening increment, a preset time interval can be made to determine whether the speed has entered the preset speed range. By adjusting the opening with a preset opening increment, the steam pressure and the speed of the rotor can be gradually adjusted to maintain the stability of the steam pressure and the rotor operation.

[0037] The preset opening increment can be gradually reduced when approaching the high value of the preset speed range. Specifically, the high value buffer can be divided into a plurality of high value sections, each high value section corresponding to a different preset opening increment. A correspondence table representing the correspondence between each high value section and the corresponding preset opening increment can be made and stored in the control end. The control end determines the preset opening increment corresponding to the speed by comparing the speed with the high value section, and finally adjusts the opening of the electric control valve with the preset opening increment.

[0038] In this way, the closer to the high value of the preset speed range, the smaller the preset opening increment is, so that the opening of the electric control valve gradually decreases during the increase, so that the steam pressure and the speed of the rotor do not drop suddenly, but are buffered, thereby maintaining the stability of the steam pressure and the rotor operation.

[0039] Finally, the process of reducing the opening of the electric control valve when the speed is lower than the lower value of the preset speed range is explained.

[0040] First, determine the buffer low value, which together with the preset speed range low value constitutes a low value buffer zone. As an example, the buffer low value can be set to 1000RPM, and the low value buffer zone is 1000RPM-2000RPM.

[0041] Next, when the speed is lower than the buffer low value, it indicates that the speed is too slow at this time, and the speed should be increased as soon as possible. Therefore, the opening of the electric control valve can be continuously reduced so that the speed enters the low value buffer zone.

[0042] When the speed is in the low value buffer, the opening is gradually adjusted by a preset opening increment. After each adjustment by a preset opening increment, a preset time interval can be made to determine whether the speed has entered the preset speed range. By adjusting the opening by a preset opening increment, the steam pressure and the speed of the rotor can be gradually adjusted to maintain the stability of the steam pressure and the operation of the rotor.

[0043] The preset opening increment can be gradually reduced when approaching the low value of the preset speed range. Specifically, the low value buffer can be divided into a plurality of low value sections, each low value section corresponding to a different preset opening increment. A corresponding relationship table representing the corresponding relationship between each low value section and the corresponding preset opening increment can be made and stored in the control end. The control end determines the preset opening increment corresponding to the speed by comparing the speed with the low value section, and finally adjusts the opening of the electric control valve with the preset opening increment.

[0044] In this way, the closer to the lower value of the preset speed range, the smaller the preset opening increment, so that the opening of the electric control valve is gradually reduced during the reduction process, so that the steam pressure and the speed of the rotor are not increased suddenly, but are buffered, thereby maintaining the stability of the steam pressure and the rotor operation.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A monitoring method for a steam turbine power generation system, characterized in that: The monitoring method comprises: Collecting vibration information of the turbine, wherein the vibration information includes vibration amplitude and vibration frequency; determining whether the vibration information indicates abnormal turbine vibration; In response to this, the speed information of the rotor of the turbine is collected; Determining whether the speed information exceeds a preset speed range; In response thereto, an opening setting to the turbine inlet duct is adjusted.

2. The monitoring method for a steam turbine power generation system according to claim 1, characterized in that: The monitoring method further comprises: After adjusting the opening of the turbine inlet pipe, the vibration information of the turbine is collected again.

3. The monitoring method for a steam turbine power generation system according to claim 1, characterized in that: After determining whether the speed information exceeds a preset speed range, the method further includes: In response to no, a fault alarm is issued.

4. The monitoring method for a steam turbine power generation system according to claim 1, characterized in that: In response, adjusting the opening of the turbine inlet duct includes: In response to the speed represented by the speed information being higher than a high value of a preset speed range, increasing the opening of the turbine inlet pipe; In response to the rotation speed represented by the rotation speed information being lower than a lower value of a preset rotation speed range, the opening of the turbine inlet pipe is reduced.

5. The monitoring method for a steam turbine power generation system according to claim 4, characterized in that: In response to the rotation speed being higher than a high value of a preset rotation speed range, increasing the opening of the turbine inlet pipe comprises: Determine a buffer high value, wherein the buffer high value and the preset speed range high value constitute a high value buffer zone; In response to the rotation speed being within the high value buffer zone, the opening of the turbine inlet pipe is increased at preset opening increment intervals and for a preset time.

6. The monitoring method for a steam turbine power generation system according to claim 5, characterized in that: The preset opening increment is determined by the following steps: Dividing the high-value buffer area into a plurality of high-value sections; Each of the high-value sections corresponds to a different preset opening increment, wherein the preset opening increment gradually decreases as the corresponding high-value section approaches a high value of a preset speed range.

7. The monitoring method for a steam turbine power generation system according to claim 5, characterized in that: After determining a buffer high value, wherein the buffer high value and the preset speed range high value constitute a high value buffer zone, the method further includes: In response to the rotation speed being higher than the buffer high value, the opening of the turbine inlet pipe is continuously increased so that the rotation speed enters the high value buffer zone.

8. The monitoring method for a steam turbine power generation system according to claim 4, characterized in that: In response to the rotation speed being lower than a lower value of a preset rotation speed range, reducing the opening of the turbine inlet pipe, comprising: Determine a buffer low value, wherein the buffer low value and the preset speed range low value constitute a low value buffer zone; In response to the rotation speed being within the low value buffer zone, the opening of the turbine inlet pipe is reduced at preset opening increment intervals and for a preset time.

9. The monitoring method for a steam turbine power generation system according to claim 8, characterized in that: The preset opening increment is determined by the following steps: Dividing the low-value buffer into a plurality of low-value segments; Each of the low-value sections corresponds to a different preset opening increment, wherein the preset opening increment gradually decreases as the corresponding low-value section approaches the low value of the preset speed range.

10. The monitoring method for a steam turbine power generation system according to claim 8, characterized in that: After determining a buffer low value, wherein the buffer low value and the preset speed range low value constitute a low value buffer zone, the method further includes: In response to the rotational speed low value and the buffer low value, the opening of the turbine inlet pipe is continuously increased so that the rotational speed enters the low value buffer zone.

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