CN113357137A - Method for detecting broken shaft of circulating water pump of thermal power plant - Google Patents
Method for detecting broken shaft of circulating water pump of thermal power plant Download PDFInfo
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- CN113357137A CN113357137A CN202110613265.9A CN202110613265A CN113357137A CN 113357137 A CN113357137 A CN 113357137A CN 202110613265 A CN202110613265 A CN 202110613265A CN 113357137 A CN113357137 A CN 113357137A
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- circulating water
- water pump
- signal
- broken shaft
- power plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The embodiment of the application discloses a method for detecting broken shaft of a circulating water pump of a thermal power plant, which comprises the following steps: the method comprises the following steps: recording and analyzing the current of the circulating water pump, screening out the idle load current and the running current, selecting a proper parameter between the idle load current and the running current as a characteristic parameter, measuring a circulating water pump outlet pressure parameter signal and recording a pressure parameter signal curve to obtain circulating water pump outlet butterfly valve switch feedback and a circulating water pump motor state; step two: and (3) picking up the signal measured in the step one by an N-second interval data continuous comparator, and carrying out threshold judgment by the N-second interval data continuous comparator and inputting a judgment result signal into a data logic judgment arithmetic unit. The application provides a broken shaft detection method for a circulating water pump of a thermal power plant, which realizes efficient, stable and reliable detection alarm, and can send a signal in time and immediately stop the running of the broken shaft circulating water pump and close a circulating pump outlet butterfly valve after the broken shaft of the circulating water pump occurs.
Description
Technical Field
The application relates to the field of circulating water pump detection, in particular to a method for detecting broken shafts of a circulating water pump of a thermal power plant.
Background
The circulating water pump is used for supplying cooling water to a steam turbine condenser to condense exhaust steam of a steam turbine, in a power plant, the circulating water pump is also used for supplying cooling water to an oil cooler, a water cooler, an air cooler of a generator and the like, the power plant is generally provided with two circulating water pumps, the circulating water pumps run by a single pump or simultaneously according to requirements, different from other water pumps of the power plant, a check valve is not additionally arranged at the outlet of the circulating water pump of almost all the power plants due to the fact that the pipe diameter of the outlet of the circulating water pump is very large, once a shaft breaking accident of the circulating water pump occurs in the actual running process due to manufacturing, installation processes and other reasons, even if a standby pump is started, the circulating water pump of the broken shaft forms channel pressure relief, the circulating water cannot maintain normal pressure and flow, a unit trips lightly, main equipment such as the steam turbine and the like are damaged seriously, and great economic loss is caused, and accordingly the shaft breaking of the circulating pump is effectively detected, it is important to quickly stop the pump and close the outlet door of the broken shaft by the broken shaft protection interlocking function.
Disclosure of Invention
In view of the above problems, the present application provides a method for detecting a broken shaft of a circulating water pump of a thermal power plant, which includes the following steps:
the method comprises the following steps: recording and analyzing the current of the circulating water pump, screening out the idle load current and the running current, selecting a proper parameter between the idle load current and the running current as a characteristic parameter, measuring a circulating water pump outlet pressure parameter signal and recording a pressure parameter signal curve to obtain circulating water pump outlet butterfly valve switch feedback and a circulating water pump motor state;
step two: the signal measured in the first step is picked up by the N-second interval data continuous comparator, the N-second interval data continuous comparator carries out threshold judgment and inputs a judgment result signal into the data logic judgment arithmetic unit, and the data logic judgment arithmetic unit compares and processes the signal; the data logic judgment arithmetic unit judges that the judgment condition of the broken shaft is met, and then an alarm signal is sent out immediately through the alarm device; and immediately sending an instruction for stopping the operation of the circulating water pump through the interlocking module, closing an outlet butterfly valve and starting a standby pump in an interlocking manner, and if the instruction does not accord with judgment and adjustment of broken shaft, the circulating water pump works normally.
Preferably, in the first step, a pressure parameter signal is measured by a tracking pump outlet pressure sensor arranged on line, a pressure parameter signal curve is recorded by a recording analyzer, a tracking pump outlet butterfly valve feedback device arranged on line obtains the switching feedback of the tracking pump outlet butterfly valve, and a tracking pump motor state feedback device arranged on line obtains the state of the tracking pump motor.
Preferably, the alarm device in the second step has two alarm modes, namely picture alarm and acousto-optic system alarm, the alarm device records the alarm event, the signal of the data logic judgment arithmetic unit passes through the single pulse signal generator before reaching the alarm device, and the single pulse signal generator separates the superior signal from the inferior signal, thereby avoiding the influence of the inferior signal on the superior signal and improving the stability of the frequency.
Preferably, in the second step, in order to avoid the false protection, any bad point of the signals in the first step and the second step is sent out by the locking protection.
Preferably, in the second step, the continuous comparator of data at intervals of N seconds judges that the outlet pressure of the circulating water pump current annunciator is smaller than the threshold value, the outlet butterfly valve state is in the open state, and when the motor state of the circulating water pump is in the running state, the data logic judgment arithmetic unit can judge that the condition of shaft breakage is met.
The beneficial effect of this application:
the application provides a broken shaft detection method for a circulating water pump of a thermal power plant, which realizes efficient, stable and reliable detection alarm, and can send a signal in time and immediately stop the running of the broken shaft circulating water pump and close a circulating pump outlet butterfly valve after the broken shaft of the circulating water pump occurs.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for detecting broken shaft of the circulating water pump with the novel structure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a method for detecting broken shaft of a circulating water pump in a thermal power plant includes the following steps:
the method comprises the following steps: recording and analyzing the current of the circulating water pump, screening out the idle load current and the running current, selecting a proper parameter between the idle load current and the running current as a characteristic parameter, measuring a circulating water pump outlet pressure parameter signal and recording a pressure parameter signal curve to obtain circulating water pump outlet butterfly valve switch feedback and a circulating water pump motor state;
step two: the signal measured in the first step is picked up by the N-second interval data continuous comparator, the N-second interval data continuous comparator carries out threshold judgment and inputs a judgment result signal into the data logic judgment arithmetic unit, and the data logic judgment arithmetic unit compares and processes the signal; the data logic judgment arithmetic unit judges that the judgment condition of the broken shaft is met, and then an alarm signal is sent out immediately through the alarm device; and immediately sending an instruction for stopping the operation of the circulating water pump through the interlocking module, closing an outlet butterfly valve and starting a standby pump in an interlocking manner, and if the instruction does not accord with judgment and adjustment of broken shaft, the circulating water pump works normally.
In the first step, a pressure parameter signal is measured by a tracking pump outlet pressure sensor which is arranged on line, the pressure sensor can detect the pressure parameter signal in real time, a pressure parameter signal curve is recorded by a recording analyzer, the pressure parameter signal can be dynamically recorded by the recording analyzer, the feedback of a tracking pump outlet butterfly valve switch is obtained by a tracking pump outlet butterfly valve feedback device which is arranged on line, and the state of a tracking pump motor is obtained by a tracking pump motor state feedback device which is arranged on line.
The alarm device in the second step has two alarm modes, namely picture alarm and acousto-optic system alarm, and multiple alarm modes are matched for use, so that a worker can timely notice that the circulating water pump is broken, the worker can timely maintain the circulating water pump conveniently, the alarm device can record alarm events, the worker can conveniently confirm the abrasion degree of the circulating water pump and timely replace the circulating water pump conveniently, signals of the data logic judgment arithmetic unit can pass through the single-pulse signal generator before reaching the alarm device, the single-pulse signal generator separates higher-level signals from lower-level signals, the influence of the lower-level signals on the higher-level signals is avoided, and the stability of frequency is improved.
In the second step, in order to avoid the protection from being sent by mistake, any dead point of the signals in the first step and the second step is sent out in a locking protection mode.
And in the second step, the N-second interval data continuous comparator judges that the outlet pressure of the circulating water pump current annunciator is smaller than a threshold value, the outlet butterfly valve is in an open state, and when the motor state of the circulating water pump is in a running state, the data logic judgment arithmetic unit judges that the conditions meeting the broken shaft occurrence conditions are met.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (5)
1. A method for detecting broken shafts of circulating water pumps of a thermal power plant is characterized by comprising the following steps:
the method comprises the following steps: recording and analyzing the current of the circulating water pump, measuring a circulating water pump outlet pressure parameter signal and recording a pressure parameter signal curve to obtain circulating water pump outlet butterfly valve switch feedback and a circulating water pump motor state;
step two: the signal measured in the first step is picked up by the N-second interval data continuous comparator, the N-second interval data continuous comparator carries out threshold judgment and inputs a judgment result signal into the data logic judgment arithmetic unit, and the data logic judgment arithmetic unit compares and processes the signal; the data logic judgment arithmetic unit judges that the judgment condition of the broken shaft is met, and then an alarm signal is sent out immediately through the alarm device; and immediately sending an instruction for stopping the operation of the circulating water pump through the interlocking module, closing an outlet butterfly valve and starting a standby pump in an interlocking manner, and if the instruction does not accord with judgment and adjustment of broken shaft, the circulating water pump works normally.
2. The method for detecting the broken shaft of the circulating water pump of the thermal power plant as claimed in claim 1, wherein in the first step, a pressure parameter signal is detected by a circulating pump outlet pressure sensor arranged on line, a pressure parameter signal curve is recorded by a recording analyzer, a circulating pump outlet butterfly valve switch feedback is obtained by a circulating pump outlet butterfly valve feedback device arranged on line, a circulating pump motor state is obtained by a circulating pump motor state feedback device arranged on line, in the first step, idle load current and running current need to be screened out in the process of recording and analyzing the circulating water pump current, and a proper parameter is selected between the idle load current and the running current as a characteristic parameter.
3. The method for detecting the broken shaft of the circulating water pump of the thermal power plant as claimed in claim 1, wherein the alarm device in the second step has two alarm modes of picture alarm and acousto-optic system alarm, the alarm device records the alarm event, the signal of the data logic judgment arithmetic unit passes through the single pulse signal generator before reaching the alarm device, the single pulse signal generator separates the upper signal from the lower signal, the influence of the lower signal on the upper signal is avoided, and the stability of the frequency is improved.
4. The method for detecting the broken shaft of the circulating water pump of the thermal power plant according to claim 1, wherein in step two, in order to avoid the false protection, any bad point of the signals in step one and step two is sent out by locking protection.
5. The method for detecting the broken shaft of the circulating water pump of the thermal power plant according to claim 1, wherein in the second step, the continuous comparator of the data at intervals of N seconds judges that the outlet pressures of the circulating water pump and the circulating water pump of the current annunciator are all smaller than the threshold value, the outlet butterfly valve is in an open state, and when the motor state of the circulating water pump is in a running state, the data logic judgment arithmetic unit judges that the condition of the broken shaft is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110613265.9A CN113357137A (en) | 2021-06-02 | 2021-06-02 | Method for detecting broken shaft of circulating water pump of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110613265.9A CN113357137A (en) | 2021-06-02 | 2021-06-02 | Method for detecting broken shaft of circulating water pump of thermal power plant |
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| CN113357137A true CN113357137A (en) | 2021-09-07 |
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| CN202110613265.9A Pending CN113357137A (en) | 2021-06-02 | 2021-06-02 | Method for detecting broken shaft of circulating water pump of thermal power plant |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103696955A (en) * | 2013-12-23 | 2014-04-02 | 中国神华能源股份有限公司 | System and method for controlling outlet butterfly valve of circulating water pump |
| CN203655590U (en) * | 2013-12-23 | 2014-06-18 | 中国神华能源股份有限公司 | System for controlling outlet butterfly valve of circulating water pump |
| CN103909006A (en) * | 2013-01-08 | 2014-07-09 | 宝山钢铁股份有限公司 | Method for detecting deflagration in coal mill outlet coal dust pipeline, and detection system thereof |
| CN104863841A (en) * | 2015-04-30 | 2015-08-26 | 国家电网公司 | Method for online efficiency monitoring of circulating water pump in thermal power plant |
| CN105674666A (en) * | 2016-03-07 | 2016-06-15 | 上海市城市排水有限公司 | Pump station cooling water circulating system and control method thereof |
| CN208024547U (en) * | 2018-02-06 | 2018-10-30 | 深圳妈湾电力有限公司 | One kind following pump discharge butterfly valve electric loop |
-
2021
- 2021-06-02 CN CN202110613265.9A patent/CN113357137A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103909006A (en) * | 2013-01-08 | 2014-07-09 | 宝山钢铁股份有限公司 | Method for detecting deflagration in coal mill outlet coal dust pipeline, and detection system thereof |
| CN103696955A (en) * | 2013-12-23 | 2014-04-02 | 中国神华能源股份有限公司 | System and method for controlling outlet butterfly valve of circulating water pump |
| CN203655590U (en) * | 2013-12-23 | 2014-06-18 | 中国神华能源股份有限公司 | System for controlling outlet butterfly valve of circulating water pump |
| CN104863841A (en) * | 2015-04-30 | 2015-08-26 | 国家电网公司 | Method for online efficiency monitoring of circulating water pump in thermal power plant |
| CN105674666A (en) * | 2016-03-07 | 2016-06-15 | 上海市城市排水有限公司 | Pump station cooling water circulating system and control method thereof |
| CN208024547U (en) * | 2018-02-06 | 2018-10-30 | 深圳妈湾电力有限公司 | One kind following pump discharge butterfly valve electric loop |
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Application publication date: 20210907 |