CN107906058B - A kind of monitoring system and method preventing nuclear power plant's vacuum pump cavitation - Google Patents
A kind of monitoring system and method preventing nuclear power plant's vacuum pump cavitation Download PDFInfo
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- CN107906058B CN107906058B CN201711050919.1A CN201711050919A CN107906058B CN 107906058 B CN107906058 B CN 107906058B CN 201711050919 A CN201711050919 A CN 201711050919A CN 107906058 B CN107906058 B CN 107906058B
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- vacuum pump
- cavitation
- temperature
- monitoring
- temperature difference
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
Abstract
The invention discloses a kind of monitoring systems for preventing nuclear power plant's vacuum pump cavitation, comprising: pressure monitor is set at the mixed gas suction inlet of vacuum pump, for monitoring the mixture pressure of the vacuum pump sucking；Temperature monitoring is set at the vacuum pump coolant inlet, for monitoring the coolant temperature into the vacuum pump；Cavitation temperature difference monitoring assembly, it is connect respectively with the pressure monitor and the temperature monitoring, for calculating the cavitation temperature difference according to the mixture pressure and the coolant temperature, to monitor whether the cavitation temperature difference is less than predetermined temperature difference to prevent the vacuum pump cavitation.In addition, the present invention also provides a kind of monitoring methods for preventing nuclear power plant's vacuum pump cavitation.The monitoring system provided by the invention for preventing nuclear power plant's vacuum pump cavitation and method are not influenced by unit difference operating condition, are not also influenced merely by coolant temperature, it can be ensured that unit prevents vacuum pump cavitation under full working scope.
Description
Technical field
The present invention relates to nuclear power station operation and management domains, and in particular to a kind of monitoring for preventing nuclear power plant's vacuum pump cavitation
System and method.
Background technique
For the steam that nuclear power plant nuclear island system generates, for driving the steam turbine of conventional island, so that generator be driven to turn
It is dynamic to produce electricl energy.For the generating efficiency for keeping steam turbine generator, nuclear power plant's secondary circuit condenser must have good vacuum degree,
If Condenser Vacuum Pressure is got higher, it will lead to power plants generating electricity efficiency and be lower, or even cause steam turbine chaser, reactor improper
Shutdown, serious person will damage Turbo-generator Set.So nuclear power plant must be provided with reliable evacuation system for steam condenser, so as to
Maintain the reliable vacuum degree of condenser, it is ensured that the safe and reliable operation of nuclear power plant.
In the prior art, vacuum pump cavitation in order to prevent, there are mainly two types of protection schemes at present: cooling water flow prison
It surveys and vacuum pump is into pump coolant temperature monitoring, but there are flow switch high failure rates, survey for protection scheme in the prior art
The problems such as accuracy of measurement is low, replacement is inconvenient, not corrosion-resistant, practical effect is very bad, and being likely to occur vacuum pump may
It has occurred and that cavitation damage but temperature switch cannot lead to the problem of alarm.
Therefore it provides a kind of monitoring system and method for reliably preventing nuclear power plant's vacuum pump cavitation, to guarantee nuclear power machine
The safe and reliable operation of group, and nuclear power plant's economic benefit is promoted, it is that current nuclear power plant's evacuation system for steam condenser is urgently to be resolved
Problem.
Summary of the invention
The present invention is for flow switch high failure rate, measurement accuracy are low in the prior art, replacement is inconvenient, not corrosion-resistant cause
Using effect is bad, and be likely to occur vacuum pump may have occurred and that cavitation damage but temperature switch cannot generate alarm
Problem provides a kind of monitoring system and method for preventing nuclear power plant's vacuum pump cavitation, it is true can effectively and reliably to monitor nuclear power plant
Sky pump coolant temperature, is not influenced by unit difference operating condition, is not also influenced merely by coolant temperature, it can be ensured that unit
Vacuum pump cavitation is prevented under full working scope.
The present invention provides a kind of monitoring systems for preventing nuclear power plant's vacuum pump cavitation, comprising:
Pressure monitor is set at the mixed gas suction inlet of vacuum pump, for monitoring the mixed of the vacuum pump sucking
Close gas pressure；
Temperature monitoring is set at the vacuum pump coolant inlet, for monitoring the cooling into the vacuum pump
Liquid temperature；
Cavitation temperature difference monitoring assembly, connect with the pressure monitor and the temperature monitoring respectively, for according to institute
It states mixture pressure and the coolant temperature calculates the cavitation temperature difference, to monitor whether the cavitation temperature difference is less than predetermined temperature
Difference is to prevent the vacuum pump cavitation.
Preferably, further include alarm device, connect with the cavitation temperature difference monitoring assembly, for being less than in the cavitation temperature difference
When predetermined temperature difference, sound an alarm.
Preferably, the cavitation temperature difference monitoring assembly includes:
Temperature conversion module is connect with the pressure monitor, corresponding for being calculated according to the mixture pressure
Mixed gas saturation temperature；
Differential thermal calculation module is connect with the temperature conversion module and the temperature monitoring respectively, for according to institute
Mixed gas saturation temperature and the coolant temperature are stated, calculates the cavitation temperature difference, and when the cavitation temperature difference is less than predetermined temperature difference
When, it generates alarm signal and controls the alarm device, triggering alarm.
It preferably, further include isolation valve module, the isolation valve module includes:
First isolating valve is set between the mixed gas suction inlet of vacuum pump and the pressure monitor, is used to open
Or close the channel of the vacuum pump sucking mixed gas；
Second isolating valve is set between the vacuum pump coolant inlet and the temperature monitoring, be used to open or
Close the channel of the vacuum pump sucking coolant liquid.
Preferably, further include controller, respectively with the pressure monitor, temperature monitoring, cavitation temperature difference monitoring assembly,
Alarm device, isolation valve module and vacuum pump connection, for controlling the pressure monitor, temperature monitoring, cavitation temperature
Poor monitoring assembly, alarm device, isolation valve module and the vacuum pump operation, and institute is controlled when the alarm device sounds an alarm
It is out of service to state vacuum pump.
Preferably, the predetermined temperature difference is 5 DEG C.
The present invention also provides a kind of monitoring methods for preventing nuclear power plant's vacuum pump cavitation, include the following steps:
The mixture pressure that S1, the monitoring vacuum pump suck；
S2, monitoring enter the coolant temperature of the vacuum pump；
S3, the cavitation temperature difference is calculated according to the mixture pressure and the coolant temperature；
Wherein the step S1 is synchronous with the step S2 carries out.
Preferably, further include step S4: when the cavitation temperature difference is less than predetermined temperature difference, sounding an alarm.
Preferably, the step S3 includes:
S31, corresponding mixed gas saturation temperature is calculated according to the mixture pressure；
S32, according to the mixed gas saturation temperature and the coolant temperature, calculate the cavitation temperature difference.
Preferably, further include step S5: when generating the alarm, control vacuum pump is out of service.
One or more technical solutions that the present invention program provides, have at least the following technical effects or advantages: the present invention
What is provided prevents the monitoring system of nuclear power plant's vacuum pump cavitation and method from not influenced by unit difference operating condition, also not by coolant liquid
The simple influence of temperature, avoids under operating condition different situations, only judges that cavitation may cause wrong report by coolant temperature value
The case where alert or vacuum pump operation irregularity, it can be ensured that unit prevents vacuum pump cavitation under full working scope.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the monitoring system structure chart for preventing nuclear power plant's vacuum pump cavitation that first embodiment of the invention provides；
Fig. 2 is the monitoring system schematic diagram for preventing nuclear power plant's vacuum pump cavitation that first embodiment of the invention provides；
Fig. 3 is the monitoring method flow diagram for preventing nuclear power plant's vacuum pump cavitation that second embodiment of the invention provides；
Fig. 4 is the monitoring method flow diagram for preventing nuclear power plant's vacuum pump cavitation that third embodiment of the invention provides.
Specific embodiment
In order to solve, flow switch high failure rate existing in the prior art, measurement accuracy is low, replacement is inconvenient, not corrosion-resistant
Cause using effect bad, and be likely to occur vacuum pump to have occurred and that cavitation is damaged but temperature switch cannot generate report
Alert problem, concrete thought of the present invention are as follows: are monitored described in mixture pressure and the entrance of the vacuum pump sucking respectively
The coolant temperature of vacuum pump calculates the cavitation temperature difference, and when the cavitation temperature difference is less than predetermined temperature difference, sounds an alarm.This hair
Bright offer prevents the monitoring system of nuclear power plant's vacuum pump cavitation and method from not influenced by unit difference operating condition, is not also cooled down
The simple influence of liquid temperature, avoids under operating condition different situations, only judges that cavitation may cause mistake by coolant temperature value
The case where alarm or vacuum pump operation irregularity, it can be ensured that unit prevents vacuum pump cavitation under full working scope.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
As shown in Figure 1, the embodiment of the present invention one provides a kind of monitoring system for preventing nuclear power plant's vacuum pump cavitation, packet
Include: pressure monitor 1 is set at the mixed gas suction inlet of vacuum pump, for monitoring the gaseous mixture of the vacuum pump sucking
Body pressure MP；Temperature monitoring 2 is set at the vacuum pump coolant inlet, for monitoring into the cold of the vacuum pump
But liquid temperature t2；Cavitation temperature difference monitoring assembly 3 connect with the pressure monitor 1 and the temperature monitoring 2 respectively, is used for
According to the mixture pressure MP and coolant temperature t2The cavitation temperature difference is calculated, whether to monitor the cavitation temperature difference
Less than predetermined temperature difference to prevent the vacuum pump cavitation；Alarm device 4 is connect with the cavitation temperature difference monitoring assembly 3, is used for
When the cavitation temperature difference is less than predetermined temperature difference, sound an alarm.Due to passing through mixture pressure and the coolant temperature meter
The cavitation temperature difference is calculated, is avoided under operating condition different situations, coolant temperature value t is only passed through2Judge that cavitation may cause false alarm
Or the case where vacuum pump operation irregularity.
Specifically, the cavitation temperature difference monitoring assembly 3 includes: differential thermal calculation device, respectively with the pressure monitor 1 and institute
The connection of temperature monitoring 2 is stated, for according to the mixture pressure MP and coolant temperature t2, calculate cavitation temperature
Difference；Alarm device 4 is connect with the differential thermal calculation device, for sounding an alarm when the cavitation temperature difference is less than predetermined temperature difference.
In the present embodiment, the cavitation temperature difference monitoring assembly 3 includes: temperature conversion module 31, with the pressure monitoring
Device 1 connects, for calculating corresponding mixed gas saturation temperature t according to the mixture pressure MP1；Differential thermal calculation module
32, it is connect respectively with the temperature conversion module 31 and the temperature monitoring 2, for being saturated temperature according to the mixed gas
Spend t1With the coolant temperature t2, calculate the cavitation temperature difference (t1-t2).Temperature conversion module 31 is according to the mixture pressure
It is as follows using formula to calculate corresponding mixed gas saturation temperature:
In formula: t1For mixed gas saturation temperature；
MP is mixture pressure.
Specifically, the monitoring system provided by the invention for preventing nuclear power plant's vacuum pump cavitation further includes controller 6, respectively with
The pressure monitor 1, temperature monitoring 2, cavitation temperature difference monitoring assembly 3, alarm device 4, isolation valve module 5 and the vacuum
Pump connection, for controlling the pressure monitor 1, temperature monitoring 2, cavitation temperature difference monitoring assembly 3, alarm device 4, isolation valve group
Part 5 and the vacuum pump operation, and it is out of service when the alarm device 4 sounds an alarm to control the vacuum pump.
In the present embodiment, as the cavitation temperature difference (t1-t2) less than 5 DEG C when, alarm device 4 sounds an alarm.
As shown in connection with fig. 2, the vacuum pump coolant temperature monitoring system of the present embodiment further includes isolation valve module 5, described
Be isolated valve module 5 include: the first isolating valve 51, be set to vacuum pump mixed gas suction inlet and the pressure monitor 1 it
Between, it is used to open or closes the channel of the vacuum pump sucking mixed gas；Second isolating valve 52, it is cold to be set to the vacuum pump
But between liquid entrance and the temperature monitoring 2, it is used to open or closes the channel of the vacuum pump sucking coolant liquid.Setting the
One isolating valve 51 and the second isolating valve 52 can control the channel of vacuum pump sucking mixed gas at any time and suck coolant liquid
Channel operation is closed, convenient for detection or maintenance.In Fig. 2, the mixed gas entrance of vacuum pump is connected with the first isolating valve in turn
51 and pressure monitor 1, the coolant inlet of vacuum pump be connected in turn the second isolating valve 52, temperature monitoring 2, heat exchanger,
Water-sealed pump and sealing radiator, the process of circulation of coolant liquid are as follows: the liquid in sealing radiator flow to heat exchange by water-sealed pump
Device, after the cooling water cooling in heat exchanger, coolant liquid is passed through after 2 monitoring temperature of temperature monitoring, through the second isolating valve
52 enter vacuum pump, to cool down to running vacuum pump；The process of circulation of mixed gas are as follows: mixed gas is in vacuum pump
Driving under, be discharged after the first isolating valve 51 is drawn into vacuum pump via pressure monitor 1.Simultaneously to coolant temperature and
The pressure of mixed gas is detected, and is calculated the cavitation temperature difference by mixture pressure and the coolant temperature, is avoided
Under operating condition different situations, only pass through coolant temperature value t2Judge that cavitation may cause false alarm or vacuum pump operation irregularity
Situation.
Embodiment two
As shown in figure 3, second embodiment of the present invention provides a kind of monitoring method for preventing nuclear power plant's vacuum pump cavitation, it is special
Sign is, includes the following steps:
The mixture pressure MP that S1, the monitoring vacuum pump suck；
S2, monitoring enter the coolant temperature t of the vacuum pump2；
S3, according to the mixture pressure MP and coolant temperature t2Calculate the cavitation temperature difference；
S4, the cavitation temperature difference be less than predetermined temperature difference when, sound an alarm；
S5, when generating the alarm, control vacuum pump are out of service.
Wherein the step S1 is synchronous with the step S2 carries out.When step S1 and S2 is carried out simultaneously, can examine simultaneously
Measure coolant temperature t2And mixed gas saturation temperature t is calculated according to mixture pressure MP1, improve computational efficiency.
Due to passing through the mixture pressure MP and coolant temperature t2Calculate the cavitation temperature difference, avoid operating condition not
With in situation, only pass through coolant temperature value t2Judge the case where cavitation may cause false alarm or vacuum pump operation irregularity.
Embodiment three
As shown in figure 4, in the present embodiment, step S3 includes:
S31, corresponding mixed gas saturation temperature t is calculated according to the mixture pressure MP1；
S32, according to the mixed gas saturation temperature t1With the coolant temperature t2, calculate the cavitation temperature difference.
Specifically, corresponding mixed gas saturation temperature is calculated according to the mixture pressure MP in the step S31
t1It is as follows using formula:
In formula: t1For mixed gas saturation temperature；
MP is mixture pressure.
In the present embodiment, as the cavitation temperature difference (t in S32 step1-t2) less than 5 DEG C when, sound an alarm.
In conclusion application scheme at least has following advantageous effects compared with the existing technology:
1) it is not influenced by unit difference operating condition, is not also influenced merely by coolant temperature；.
2) it avoids under operating condition different situations, only passes through coolant temperature value t2Judge cavitation may cause false alarm or
The case where vacuum pump operation irregularity, it can be ensured that unit prevents vacuum pump cavitation under full working scope.
As described above, the above-mentioned monitoring system for preventing nuclear power plant's vacuum pump cavitation above-mentioned prevents nuclear power for implementing
The monitoring method of factory's vacuum pump cavitation, so, the embodiment and one or more embodiment phases of the above method of the system
Together, it just no longer repeats one by one herein.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and weighs according to the present invention
Benefit requires made equivalent variations, still belongs to the scope covered by the invention.
Claims (10)
1. a kind of monitoring system for preventing nuclear power plant's vacuum pump cavitation characterized by comprising
Pressure monitor (1), is set at the mixed gas suction inlet of vacuum pump, for monitoring the mixing of the vacuum pump sucking
Gas pressure；
Temperature monitoring (2) is set at the vacuum pump coolant inlet, for monitoring the coolant liquid into the vacuum pump
Temperature；
Cavitation temperature difference monitoring assembly (3) is connect with the pressure monitor (1) and the temperature monitoring (2) respectively, is used for root
Calculate the cavitation temperature difference according to the mixture pressure and the coolant temperature, with monitor the cavitation temperature difference whether be less than it is pre-
The temperature difference is determined to prevent the vacuum pump cavitation.
2. the monitoring system according to claim 1 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that further include alarm
Device (4) is connect with the cavitation temperature difference monitoring assembly (3), for issuing when the cavitation temperature difference is less than the predetermined temperature difference
Alarm.
3. the monitoring system according to claim 2 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that the cavitation temperature
Poor monitoring assembly (3) includes:
Temperature conversion module (31) is connect with the pressure monitor (1), is corresponded to for being calculated according to the mixture pressure
Mixed gas saturation temperature；
Differential thermal calculation module (32) connect with the temperature conversion module (31) and the temperature monitoring (2) respectively, is used for
According to the mixed gas saturation temperature and the coolant temperature, the cavitation temperature difference is calculated, is made a reservation for when the cavitation temperature difference is less than
When the temperature difference, generates alarm signal and control the alarm device (4), triggering alarm.
4. the monitoring system according to claim 3 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that further include isolation
Valve module (5), the isolation valve module (5) include:
First isolating valve (51) is set between the mixed gas suction inlet of vacuum pump and the pressure monitor (1), for beating
The channel of the vacuum pump sucking mixed gas is closed on or off；
Second isolating valve (52) is set between the vacuum pump coolant inlet and the temperature monitoring (2), is used to open
Or close the channel of the vacuum pump sucking coolant liquid.
5. the monitoring system according to claim 4 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that further include control
Device (6), respectively with the pressure monitor (1), temperature monitoring (2), cavitation temperature difference monitoring assembly (3), alarm device (4), every
It is connected from valve module (5) and the vacuum pump, for controlling the pressure monitor (1), temperature monitoring (2), cavitation temperature
Poor monitoring assembly (3), alarm device (4), isolation valve module (5) and the vacuum pump operation, and issued in the alarm device (4)
It is out of service that the vacuum pump is controlled when alarm.
6. the monitoring system according to claim 2 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that the predetermined temperature
Difference is 5 DEG C.
7. a kind of monitoring method for preventing nuclear power plant's vacuum pump cavitation, which comprises the steps of:
The mixture pressure that S1, the monitoring vacuum pump suck；
S2, monitoring enter the coolant temperature of the vacuum pump；
S3, the cavitation temperature difference is calculated according to the mixture pressure and the coolant temperature；
Wherein the step S1 is synchronous with the step S2 carries out.
8. the monitoring method according to claim 7 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that further include step
S4: it when the cavitation temperature difference is less than predetermined temperature difference, sounds an alarm.
9. the monitoring method according to claim 7 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that the step S3
Include:
S31, corresponding mixed gas saturation temperature is calculated according to the mixture pressure；
S32, according to the mixed gas saturation temperature and the coolant temperature, calculate the cavitation temperature difference.
10. the monitoring method according to claim 9 for preventing nuclear power plant's vacuum pump cavitation, which is characterized in that further include step
Rapid S5: when generating the alarm, control vacuum pump is out of service.
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| CN201711050919.1A CN107906058B (en) | 2017-10-31 | 2017-10-31 | A kind of monitoring system and method preventing nuclear power plant's vacuum pump cavitation |
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| CN107906058B true CN107906058B (en) | 2019-07-23 |
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| JP6947152B2 (en) * | 2018-12-07 | 2021-10-13 | 横河電機株式会社 | Detection device, detection method, and detection program |
| CN112012937B (en) * | 2020-07-29 | 2022-06-07 | 中广核核电运营有限公司 | Transient cavitation fault detection method and device for steam turbine pump and steam turbine pump |
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