CN219317008U - Condensing steam turbine low pressure shaft seal steam supply system - Google Patents
Condensing steam turbine low pressure shaft seal steam supply system Download PDFInfo
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- CN219317008U CN219317008U CN202320661681.0U CN202320661681U CN219317008U CN 219317008 U CN219317008 U CN 219317008U CN 202320661681 U CN202320661681 U CN 202320661681U CN 219317008 U CN219317008 U CN 219317008U
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Abstract
The utility model belongs to the technical field of condensing steam turbines, and particularly provides a low-pressure shaft seal steam supply system of a condensing steam turbine, which comprises a steam supply main pipe, a steam supply branch pipe, a steam return main pipe, a vibration sensor and a temperature sensor; the steam inlet end of the main steam supply pipe is respectively communicated with the main pipeline and the auxiliary pipeline, the main pipeline is communicated with the main steam source station, and the auxiliary pipeline is communicated with the auxiliary steam header; the two steam supply branch pipes are respectively communicated with steam inlets of two first shaft seals and a second shaft seal at the front side and the rear side of a low pressure cylinder in the condensing steam turbine; the steam return branch pipe is respectively communicated with steam outlets of the first shaft seal and the second shaft seal; the main steam return pipe is communicated with the branch steam return pipe, and the vibration sensor and the temperature sensor are respectively arranged at bearings of the first shaft seal and the second shaft seal; when signals of the vibration sensor, the temperature sensor and the flow sensor exceed preset signal thresholds in the controller, the controller can send alarm instructions to the alarm.
Description
Technical Field
The utility model belongs to the technical field of condensing steam turbines, and particularly provides a low-pressure shaft seal steam supply system of a condensing steam turbine.
Background
The function of the low-pressure shaft seal in the condensing steam turbine is to prevent steam leakage at the low-pressure shaft of the steam turbine. In a condensing steam turbine, the steam exhausted from the low pressure wheel blades is condensed into water, and then recovered into a boiler to be heated into steam which enters the steam turbine again. If steam leaks at the low pressure wheel blades, steam losses can result, reducing the efficiency of the turbine. The low-pressure shaft seal can effectively prevent steam leakage and ensure the normal operation of the steam turbine. In order to achieve effective sealing at the low pressure shaft seal, steam needs to be introduced into the low pressure shaft seal, and the steam is utilized to form air seal at the low pressure shaft seal and the low pressure impeller shaft.
The inventor knows that after long-term use, the low-pressure shaft seal at the low-pressure wheel blade is likely to fail, so that high-pressure steam at the low-pressure wheel blade in the low-pressure cylinder of the steam turbine leaks from the low-pressure shaft seal; in the prior art, whether the steam at the low-pressure shaft seal is effectively sealed or not is monitored only by monitoring the steam supply quantity and the steam return quantity of the low-pressure shaft seal, the monitoring means is single, and the condition of missing report is easy to occur in the measurement precision of the flow sensor.
Disclosure of Invention
The utility model aims to provide a low-pressure shaft seal steam supply system of a condensing steam turbine, which at least solves one of the technical problems.
In order to solve the above problems in the prior art, one or more embodiments of the present utility model provide a low pressure shaft seal steam supply system of a condensing steam turbine, including a steam supply main pipe, a steam supply branch pipe, a steam return main pipe, a vibration sensor, a temperature sensor, a flow sensor, an alarm and a controller; the steam inlet end of the main steam supply pipe is respectively communicated with the main pipeline and the auxiliary pipeline, the main pipeline is communicated with the main steam source station, the main steam source station is communicated with the superheater outlet of the boiler, and the auxiliary pipeline is communicated with the auxiliary steam header; the number of the steam supply branch pipes is two, and the two steam supply branch pipes are respectively communicated with steam inlets of two first shaft seals and a second shaft seal at the front side and the rear side of a low pressure cylinder in the condensing steam turbine. The number of the steam return branch pipes is two, and the two steam return branch pipes are respectively communicated with steam outlets of the first shaft seal and the second shaft seal; the main steam return pipe is communicated with the branch steam return pipe and is used for recovering steam exhausted by the branch steam return pipe; the vibration sensor and the temperature sensor are respectively arranged at the bearings of the first shaft seal and the second shaft seal and used for collecting vibration signals and temperature signals of the first shaft seal and the second shaft seal; each steam supply branch pipe and each steam return branch pipe are respectively provided with a flow sensor; the alarm can receive external instructions and issue an alarm.
The controller is respectively in signal communication with the vibration sensor, the temperature sensor and the flow sensor, a preset signal threshold is stored in the controller, and when signals of the vibration sensor, the temperature sensor and the flow sensor exceed the preset signal threshold, the controller can send an alarm instruction to the alarm.
Further, the vibration sensor, the temperature sensor and the flow sensor are all wireless transmission type sensors.
Further, the controller is a single chip microcomputer or an arm processor.
Further, the steam supply branch pipe is respectively provided with a one-way valve and an electric stop valve, and the one-way valve is used for limiting the flow of steam from the main steam supply pipe to the steam supply branch pipe; the electric stop valve is used for realizing the on-off of the steam supply branch pipe.
Further, the alarm is an audible and visual alarm, and the alarm is arranged outside the condensing steam turbine.
Further, a three-way valve is arranged at the position of the main steam supply pipe, two inlets of the three-way valve are respectively communicated with outlets of the main pipeline and the auxiliary pipeline, and the outlet of the three-way valve is communicated with the main steam supply pipe.
The beneficial effects of one or more of the technical schemes are as follows:
in the scheme, vibration sensors are respectively arranged at two low-pressure shaft seals (namely a first shaft seal and a second shaft seal) at two sides of a low-pressure cylinder of a steam turbine; vibration at the first shaft seal and the second shaft seal is monitored by utilizing a vibration sensor, and then when high-temperature and high-pressure steam at the low-pressure wheel blade leaks from the low-pressure shaft seal, the fluctuation of a vibration signal of the low-pressure shaft seal caused by the high-temperature and high-pressure steam can be timely collected and provided for a controller to be compared.
In the scheme, temperature sensors are respectively arranged at two low-pressure shaft seals (namely a first shaft seal and a second shaft seal) at two sides of a low-pressure cylinder of a steam turbine; and the vibration of the first shaft seal and the second shaft seal is monitored by using the temperature sensor, so that when the high-temperature and high-pressure steam at the low-pressure wheel blade leaks from the low-pressure shaft seal, the temperature value variation caused by the high-temperature and high-pressure steam can be timely collected and provided for the controller to be compared.
According to the scheme, through the cooperation of the vibration sensor, the temperature sensor and the flow sensor, whether the air seal at the low-pressure shaft seal is normally used or not can be judged by utilizing the flow sensor; the redundant designs of the vibration sensor and the temperature sensor can be utilized to judge whether the high-temperature high-pressure steam in the low-pressure cylinder leaks from the low-pressure shaft seal.
Drawings
Some embodiments of the present application are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram showing the connection of the whole structure in the embodiment of the present utility model.
List of reference numerals: 1. a return main pipe; 2. a first return branch pipe; 3. a first shaft seal; 4. a first steam supply branch pipe; 5. a steam supply main pipe; 6. a second return branch pipe; 7. second sealing; 8. a second steam supply branch pipe; 10. a main pipe; 11. a three-way valve; 12. an auxiliary duct.
Detailed Description
It should be understood by those skilled in the art that the embodiments described below are only preferred embodiments of the present application, which are merely for explaining the technical principles of the present application and are not intended to limit the scope of the present application.
It should be noted that, in the description of the present application, terms such as "center," "upper," "lower," "top," "bottom," "vertical," "horizontal," "inner," "outer," and the like indicate directional or positional relationships, and are based on the directional or positional relationships shown in the drawings, for convenience of description only, and do not indicate or imply that the devices or elements must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the connection may be direct, indirect via an intermediate medium, or communication between two elements. The specific meaning of the terms in this application will be understood by those skilled in the art as the case may be.
As shown in fig. 1, the embodiment provides a low-pressure shaft seal steam supply system of a condensing steam turbine, which comprises a steam supply main pipe 5, a steam supply branch pipe, a steam return main pipe 1, a vibration sensor, a temperature sensor, a flow sensor, an alarm, a controller and other components.
Specifically, the steam inlet end of the main steam supply pipe 5 communicates with the main pipe 10 and the auxiliary pipe 12, respectively. The main pipe 10 is connected to a main steam source station, which is connected to the superheater outlet of the boiler. The auxiliary conduit 12 is connected to an auxiliary steam header. In this way, the main pipe 10 and the auxiliary pipe 12 respectively supply main steam and auxiliary steam to supply the steam supply system of the low pressure shaft seal of the condensing turbine.
The number of the steam supply branch pipes is two, and the two steam supply branch pipes are respectively communicated with steam inlets of the two first shaft seals 3 and the second shaft seals 7 at the front side and the rear side of the low pressure cylinder in the condensing steam turbine. Thus, the steam supply branch pipe supplies steam to the first shaft seal 3 and the second shaft seal 7, and a complete steam supply system is formed.
As shown in fig. 1, the steam supply branch pipes are a first steam supply branch pipe 4 and a second steam supply branch pipe 8, the first steam supply branch pipe 4 is communicated with the air inlet at the first shaft seal 3, and the second steam supply branch pipe 8 is communicated with the air inlet at the second shaft seal 7.
The number of the steam return branch pipes is two, and the two steam return branch pipes are respectively communicated with steam outlets of the first shaft seal 3 and the second shaft seal 7. The main steam returning pipe 1 is connected with the branch steam returning pipe for recovering the steam exhausted by the branch steam returning pipe. Therefore, the steam return system can recover steam, and energy recovery and energy conservation are realized.
As shown in fig. 1, the steam return branch pipes are a first steam return branch pipe 2 and a second steam return branch pipe 6, the first steam return branch pipe 2 is communicated with the steam outlet of the first shaft seal 3, and the second steam return branch pipe 6 is communicated with the steam outlet of the second shaft seal 7.
The vibration sensor and the temperature sensor are respectively arranged at the bearings of the first shaft seal 3 and the second shaft seal 7 and are used for collecting vibration signals and temperature signals of the first shaft seal 3 and the second shaft seal 7. These signals can reflect the operating state of the shaft seal and provide basis for subsequent control.
Each steam supply branch pipe and each steam return branch pipe are respectively provided with a flow sensor. The sensors can measure the flow of the steam supply branch pipe and the steam return branch pipe in real time, and provide basis for subsequent control.
The alarm can receive external instructions and issue an alarm. When the system is abnormal, the alarm can give an alarm to remind operators to deal with the problem in time.
The controller is in signal communication with the vibration sensor, the temperature sensor and the flow sensor, respectively. The controller stores a preset signal threshold value, and when signals of the vibration sensor, the temperature sensor and the flow sensor exceed the preset signal threshold value, the controller can send an alarm instruction to the alarm. Therefore, the system can give an alarm in time under abnormal conditions, remind operators to deal with problems in time, and ensure safe and stable operation of the system.
The controller stores preset signal thresholds that can be set according to specific requirements of the device or system. When the signals of the vibration sensor, the temperature sensor and the flow sensor exceed the preset signal threshold, the controller can identify the abnormal signals and send an alarm instruction to the alarm. These alarm instructions may be communicated in a variety of ways, such as by sound, light, etc. In this way, an operator or maintenance personnel may take timely action to solve the problem, thereby avoiding possible equipment or system failures.
The vibration sensor, the temperature sensor and the flow sensor are all wireless transmission type sensors. In this embodiment, the vibration sensor, the temperature sensor, and the flow sensor are all wireless transmission type sensors. The sensors may communicate with the receiver via a wireless network or other wireless technology. By using a wireless transmission type sensor, the installation and maintenance of the sensor can be greatly simplified, and data can be remotely monitored and controlled when needed.
In this embodiment, the controller is a single-chip microcomputer or an arm processor.
In the embodiment, a check valve and an electric stop valve are respectively arranged at the steam supply branch pipe, and the check valve is used for limiting the flow of steam from the steam supply main pipe 5 to the steam supply branch pipe; the electric stop valve is used for realizing the on-off of the steam supply branch pipe.
Specifically, the check valve functions to restrict the flow of steam from the main steam supply pipe 5 to the branch steam supply pipe to ensure that the direction of the flow of steam is unidirectional. This helps to prevent back flow or reverse flow of steam, thereby maintaining stability and safety of the system. The check valve may be of any suitable design, such as a ball valve, butterfly valve or gate valve, to ensure that it effectively restricts steam flow.
The electric stop valve is used for realizing the on-off of the steam supply branch pipe. Such valves may be controlled by means of electric motors, hydraulic or pneumatic machines, etc. to quickly close or open the supply manifold when required. The electrically operated shut-off valve may be of any suitable design, such as a ball valve, butterfly valve or gate valve, to ensure that it is able to effectively control flow.
These components may be installed and configured as desired. For example, a one-way valve may be placed at the inlet of the steam supply manifold, and an electrically operated shut-off valve may be placed at the outlet. In addition, the size and type of valves used may be determined according to actual needs to ensure that they meet the requirements of the system.
In the embodiment, the alarm is an audible and visual alarm, and the alarm is arranged outside the condensing steam turbine.
In this embodiment, the steam supply main pipe 5 is provided with a three-way valve 11, two inlets of the three-way valve 11 are respectively communicated with outlets of the main pipe 10 and the auxiliary pipe 12, and an outlet of the three-way valve 11 is communicated with the steam supply main pipe 5.
In this embodiment, the function of the three-way valve 11 is to connect the outlets of the main pipe 10 and the auxiliary pipe 12 to the main steam supply pipe 5 to ensure that steam can be supplied from both sources when required.
Working principle:
when the device is used, when the condensing steam turbine is operated, the main pipeline or the auxiliary pipeline is utilized to supply steam to the main steam supply pipe, and the main pipeline or the auxiliary pipeline, the superheater outlet of the boiler and the steam condition in the auxiliary steam header are specifically selected for determination, and the main pipeline or the auxiliary pipeline and the superheater outlet of the boiler and the steam condition in the auxiliary steam header are selected by the person skilled in the art.
The steam of the main steam supply pipe is transmitted to the inside of the shaft seal through the steam supply branch pipe, and the inside of the shaft seal forms air seal. Then the steam flows out from the shaft seal to a main steam return pipe, and the main steam return pipe recovers the steam for later use. The temperature and pressure of the steam supplied at the main pipe are lower than those of the steam at the low-pressure impeller in the low-pressure cylinder.
When steam at the low-pressure impeller in the low-pressure cylinder leaks from the shaft seal to the outside of the steam turbine, the temperature of the shaft seal can be increased; and the self vibration signal of the shaft seal can be changed due to the inflow of high-temperature and high-pressure steam.
The controller receives signals at the temperature sensor and the vibration sensor in real time and compares the signals with a preset signal threshold value; and when the controller finds that the signal acquired by the sensor exceeds the threshold value, an alarm instruction is sent to the alarm.
When the steam flow difference value measured by the flow detection sensor at the steam supply main pipe and the steam return main pipe meets a set range, the controller sends an alarm instruction to the alarm.
Thus far, the technical solution of the present application has been described in connection with the foregoing preferred embodiments, but it is easily understood by those skilled in the art that the protective scope of the present application is not limited to the above-described preferred embodiments. The technical solutions in the above preferred embodiments may be split and combined by those skilled in the art without departing from the technical principles of the present application, and equivalent changes or substitutions may be made to related technical features, so any changes, equivalent substitutions, improvements, etc. made within the technical concepts and/or technical principles of the present application will fall within the protection scope of the present application.
Claims (6)
1. A low pressure shaft seal steam supply system for a condensing steam turbine, comprising:
the steam supply main pipe is characterized in that the steam inlet end of the steam supply main pipe is respectively communicated with a main pipeline and an auxiliary pipeline, the main pipeline is communicated with a main steam source station, the main steam source station is communicated with a superheater outlet of the boiler, and the auxiliary pipeline is communicated with an auxiliary steam header;
the two steam supply branch pipes are respectively communicated with steam inlets of two first shaft seals and two second shaft seals at the front side and the rear side of a low pressure cylinder in the condensing steam turbine;
the number of the steam return branch pipes is two, and the two steam return branch pipes are respectively communicated with steam outlets of the first shaft seal and the second shaft seal;
the main steam return pipe is communicated with the branch steam return pipe and is used for recovering steam exhausted by the branch steam return pipe;
the vibration sensor and the temperature sensor are respectively arranged at the bearings of the first shaft seal and the second shaft seal and used for collecting vibration signals and temperature signals of the first shaft seal and the second shaft seal;
the number of the flow sensors is multiple, and each steam supply branch pipe and each steam return branch pipe are respectively provided with one flow sensor;
an alarm which can receive external instructions and give an alarm;
and the controller is respectively in signal communication with the vibration sensor, the temperature sensor and the flow sensor, a preset signal threshold value is stored at the controller, and when the signals of the vibration sensor, the temperature sensor and the flow sensor exceed the preset signal threshold value, the controller can send an alarm instruction to the alarm.
2. The condensing steam turbine low pressure shaft seal steam supply system of claim 1, wherein the vibration sensor, the temperature sensor and the flow sensor are all wireless transmission type sensors.
3. The condensing turbine low pressure shaft seal steam supply system of claim 1, wherein the controller is a single chip or an arm processor.
4. The condensing steam turbine low pressure shaft seal steam supply system according to claim 1, wherein the steam supply branch pipes are respectively provided with a one-way valve and an electric stop valve, and the one-way valve is used for limiting the flow of steam from the main steam supply pipe to the branch steam supply pipe; the electric stop valve is used for realizing the on-off of the steam supply branch pipe.
5. The condensing turbine low pressure shaft seal steam supply system of claim 1, wherein the alarm is an audible and visual alarm, and the alarm is arranged outside the condensing turbine.
6. The condensing steam turbine low pressure shaft seal steam supply system according to claim 1, wherein a three-way valve is arranged at the steam supply main pipe, two inlets of the three-way valve are respectively communicated with outlets of the main pipe and the auxiliary pipe, and an outlet of the three-way valve is communicated with the steam supply main pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320661681.0U CN219317008U (en) | 2023-03-27 | 2023-03-27 | Condensing steam turbine low pressure shaft seal steam supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320661681.0U CN219317008U (en) | 2023-03-27 | 2023-03-27 | Condensing steam turbine low pressure shaft seal steam supply system |
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| Publication Number | Publication Date |
|---|---|
| CN219317008U true CN219317008U (en) | 2023-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320661681.0U Active CN219317008U (en) | 2023-03-27 | 2023-03-27 | Condensing steam turbine low pressure shaft seal steam supply system |
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| CN (1) | CN219317008U (en) |
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- 2023-03-27 CN CN202320661681.0U patent/CN219317008U/en active Active
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