CN104733059B - A kind of nuclear power station main pump axial seal pressure bascule and method - Google Patents
A kind of nuclear power station main pump axial seal pressure bascule and method Download PDFInfo
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- CN104733059B CN104733059B CN201510144555.8A CN201510144555A CN104733059B CN 104733059 B CN104733059 B CN 104733059B CN 201510144555 A CN201510144555 A CN 201510144555A CN 104733059 B CN104733059 B CN 104733059B
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- main pump
- valve
- axle envelope
- balance
- header tank
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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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of nuclear power station main pump axial seal pressure bascule and method, solve present in prior art when primary Ioops are vacuumized, because of the formation water seal of axle envelope balance pipe, so that main pump axial seal pressure is uneven, it is necessary to suspend the technical problem for vacuumizing and carrying out draining to remove balance pipe and delaying the duration.The pressure equaliser includes：Main pump axle envelope balance pipe (10)；It is arranged on the header tank (20) below balance pipe (10)；It is connected with balance pipe (10) and header tank (20), the displacement for controlling balance pipe (10) and header tank (20), so that main pump axle envelope is in the valve member (30) of pressure balance.The pressure equaliser is realized carries out draining to axle envelope balance pipe incessantly in whole vacuum, to maintain main pump shaft to seal up the pressure balance in downstream, without repeated disassembled and assembled balance pipe, reduce or avoid the problem of balance composite pipe tightness is impaired, it is ensured that the reliability of main pump axle envelope pressure balance in whole process.
Description
Technical field
The present invention relates to nuclear power station main pump axial seal pressure balancing technique field, more particularly to a kind of nuclear power station main pump axle envelope pressure
Thrust balancing device and method.
Background technology
Current China is transporting or in the nuclear power station built based on presurized water reactor, and type belongs to second generation nuclear power technology or it changes
Enter type, the scale of unit is from 300,000~1,000,000 kW.Main pump is that unique rotary machine is set in reactor coolant loop
It is standby.Sealing device (i.e. main pump axle envelope) between the pump shaft of rotation and the pump case of fixation, it is radioactive to limit HTHP band
Leakage from cooling agent to containment.For high-tension apparatus, sealing is an important technology.
Required according to pressurized-water reactor nuclear power plant debugging test, in the starting stage of cold conditions function test and hot function test,
It is both needed to be full of water to primary Ioops and is sufficiently vented, until primary Ioops air content is qualified, that is, meets primary Ioops surplus air
Volume is less than 21 standards rice (Nm3) requirement, wherein including vacuum pumping in primary Ioops exhaust process.Due to reaction
Reactor coolant system (RCP, Reactor Coolant System) main pump axle envelope can not bear reverse differential pressure, i.e. main pump axle envelope
Downstream leak conduit pressure can not flow greatly injection pipeline pressure thereon, and otherwise the seal face of main pump axle envelope has dislocation risk,
And sealing can not be ensured, so needing to carry out upstream and downstream pressure balance guarantor to main pump axle envelope during this vacuum pumping
Shield, balances the upstream and downstream pipeline pressure difference of main pump axle envelope, to avoid the occurrence of reverse differential pressure.Specifically, existing realize main pump axle envelope
The method of upstream and downstream pressure balance is as shown in figure 1, by taking a main pump as an example, i.e., using high-pressure hose (also referred to as axle envelope balance pipe) 2
(i.e. main pump one seals 1 upstream flow in pipes and downstream leak conduit to the upstream and downstream of the differential pressure indicator of a connection number sealing 1 of main pump
Between), make to be additionally provided with for the draining of balance pipe 2 on number pressure at both sides of axle envelope 1 balance of main pump, usual axle envelope balance pipe 2
Hydrophobic valve and drain tap.
However, using existing this main pump axial seal pressure bascule and method, at the scene meeting when practical operation
Meet some problems：Early stage is being vacuumized, a number axle envelope of main pump is by nuclear island desalination water distribution system (SED) when primary Ioops are intake
Water supply is carried out, though stop injecting demineralized water to axle envelope during vacuumizing, due to the reasons such as the arrangement of axle envelope pipeline, axle
Can the more water of remaining in tube sealing road；And when primary Ioops are vacuumized, these residual water can enter in balance pipe 2 so that balance
Pipe 2 loses the effect of a number sealing pressure at both sides of balance main pump；Vacuum pumping must be stopped when this condition is met, every
From valve, axle envelope balance pipe 2 is removed, the water in balance pipe 2 is excluded.According to practical operation experience, needed during vacuumizing every time
To 2 draining of balance pipe 2-3 times, cause the time for influenceing critical path to run 1-3 hours.Further, put down due to axle envelope need to be removed
The pipe 2 that weighs carries out draining, and may bring gas leakage equivalent risk for axle envelope balance pipe 2 when being repeated several times and performing this operation, makes
Primary Ioops vacuumize work and need to repeat pressurize, and delay the duration.
It can be seen that, exist in the prior art when primary Ioops are vacuumized, because forming water seal in axle envelope balance pipe so that main pump one
Number axle envelope upstream and downstream pressure imbalance causes to vacuumize work stoppage, and need to remove balance pipe and carry out draining, and delays the duration
Technical problem；In addition, also existing in the prior art due to balance pipe repeated disassembled and assembled, the technology that its sealing can not be protected is asked
Topic.
The content of the invention
The present invention is for present in prior art, when primary Ioops are vacuumized, because of the formation water seal of axle envelope balance pipe so that
Main pump axial seal pressure imbalance causes to vacuumize work stoppage, and need to remove balance pipe progress draining and delay the duration, Yi Jiping
The technical problem that weighing apparatus composite pipe tightness can not be ensured is realized there is provided a kind of nuclear power station main pump axial seal pressure bascule and method
Draining is carried out to balance pipe incessantly in whole vacuum, to maintain main pump shaft to seal up downstream pressure balance, without
Repeated disassembled and assembled balance pipe, reduces or avoids the problem of balance composite pipe tightness is impaired, it is ensured that the axle envelope pressure difference in whole process
The reliability of balance.
On the one hand, the embodiments of the invention provide a kind of nuclear power station main pump axial seal pressure bascule, the pressure balance
Device includes：
For connecting the upstream flow in pipes of main pump axle envelope and the main pump axle envelope balance pipe of downstream leak conduit；
It is arranged on below the main pump axle envelope balance pipe, is connected with the main pump axle envelope balance pipe, for the main pump
The header tank of the online draining of axle envelope balance pipe；
It is connected with the main pump axle envelope balance pipe and the header tank, in the main pump axle envelope balance pipe draining and right
During primary Ioops are vacuumized, the displacement of the main pump axle envelope balance pipe and the header tank is controlled, so that the main pump
Axle envelope is in the valve member of pressure balance.
Optionally, the U-shaped layout of main pump axle envelope balance pipe, the main pump axle envelope balance pipe includes：
The first balance pipeline section of trip flow in pipes is sealed up for connecting main pump shaft；
The second balance pipeline section for connecting main pump axle envelope downstream leak conduit；
The bottom of the U-shaped layout is arranged on, for connecting the first balance pipeline section, the second balance pipeline section and institute
State the short tube of header tank.
Optionally, the pressure equaliser also includes：
The first pipeline for connecting the short tube and the header tank；
It is arranged on above the short tube, first pair of vacant duct for connecting the short tube and outside atmosphere；
It is arranged on above the header tank, second pair of vacant duct for connecting the header tank and outside atmosphere；
It is arranged on below the header tank, the second pipe for discharging ponding in the header tank.
Optionally, the valve member includes：
It is arranged on the first balance pipeline section, for controlling the upstream flow in pipes and the described first balance pipeline section
The formal valve in upstream of connection；
It is arranged on the second balance pipeline section, for controlling the second balance pipeline section and the downstream leak conduit
The formal valve in downstream of connection；
It is arranged on first pair of vacant duct, the first valve of the connection for controlling the short tube and outside atmosphere
Door；
It is arranged on first pipeline, the of the connection for controlling the main pump axle envelope balance pipe and the header tank
Two valves；
It is arranged on second pair of vacant duct, the 3rd of the connection for controlling the header tank and outside atmosphere the
Valve；
It is arranged on the second pipe, the 4th valve of the displacement for controlling the header tank.
Optionally, the pressure equaliser also includes：
It is arranged on the header tank, the liquid level gauge of the water level for monitoring the header tank.
Optionally, the first balance pipeline section and the second balance pipeline section use high pressure steel lining hose, the high pressure
The steel liner tube can bear the absolute vacuum pressure of at least 17,000 handkerchiefs.
Optionally, all valves can be just normally opened under the absolute vacuum pressure of minimum 17,000 handkerchief in the valve member
Open or close.
On the other hand, the embodiment of the present invention additionally provides a kind of nuclear power station main pump axial seal pressure balance control method, application
In nuclear power station main pump axial seal pressure bascule, the control method for pressure balance includes step：
S1, after main pump shaft seals up trip injection cut-out, main pump axle envelope is carried out by main pump axle envelope balance pipe and header tank
Pipeline draining；
S2, after the completion of the upstream flow in pipes draining, and during primary Ioops are vacuumized, pass through valve member control
The main pump axle envelope balance pipe is made to the header tank draining, to prevent the main pump axle envelope balance pipe when primary Ioops are vacuumized
Generation water seal phenomenon, and then the main pump axle envelope is in pressure balance.
Optionally, the step S1 is specially：
After main pump shaft seals up trip injection cut-out, the formal valve in upstream, the first valve, the second valve, the 3rd valve are opened
With the 4th valve, to carry out pipeline draining to main pump axle envelope by main pump axle envelope balance pipe and header tank.
Optionally, the step S2 is specifically included：
S21, after the completion of the upstream flow in pipes draining, close the formal valve in upstream, first valve, institute
State the second valve, the 3rd valve and the 4th valve；
S22, during primary Ioops are vacuumized, control second valve to be in opening, and first valve
Door, the 3rd valve and the 4th valve are remained off, so that the main pump axle envelope balance pipe is to the header tank
Draining, and prevent the main pump axle envelope balance pipe from occurring water seal phenomenon, and then the main pump axle envelope is in pressure balance.
Optionally, the step S22 is specifically included：
S221, during primary Ioops are vacuumized, control second valve to be in opening, and first valve
Door, the 3rd valve and the 4th valve are remained off, so that the main pump axle envelope balance pipe is to header tank draining,
And the water level of the header tank is monitored by liquid level gauge；
S222, when the liquid level gauge monitors and obtains the water level of the header tank and reach preset water level, taken out very in primary Ioops
It is empty incessantly in the case of, second valve is closed, and control to open the 3rd valve and the 4th valve, with to institute
State header tank and carry out draining；
S223, after the completion of the header tank draining, close the 3rd valve and the 4th valve, and slowly open
Second valve, so that the main pump axle envelope balance pipe is connected again with the header tank, to prevent the main pump axle envelope from putting down
Water seal phenomenon occurs for the pipe that weighs, and then the main pump axle envelope is in pressure balance.
One or more technical schemes provided in an embodiment of the present invention, have at least the following technical effects or advantages：
Because in embodiments of the present invention, main pump axial seal pressure bascule includes：Upstream for connecting main pump axle envelope
The main pump axle envelope balance pipe of flow in pipes and downstream leak conduit；It is arranged on below the main pump axle envelope balance pipe, with the master
Pump Shaft Seal balance pipe is connected, for the header tank to the online draining of main pump axle envelope balance pipe；Balanced with the main pump axle envelope
Pipe and header tank connection, for during the main pump axle envelope balance pipe draining and vacuumizing to primary Ioops, controlling
The displacement of the main pump axle envelope balance pipe and the header tank, so that the main pump axle envelope is in the valve of pressure balance
Component.That is, after main pump shaft seals up trip injection cut-out, being entered by main pump axle envelope balance pipe and header tank to main pump axle envelope
Row pipeline draining；After the completion of the upstream flow in pipes draining, and during primary Ioops are vacuumized, pass through valve member control
The main pump axle envelope balance pipe is made to the header tank draining, to prevent the main pump axle envelope balance pipe when primary Ioops are vacuumized
Generation water seal phenomenon, and then the main pump axle envelope is in pressure balance；Efficiently solve in the prior art at one time
When road is vacuumized, because of the formation water seal of axle envelope balance pipe so that main pump axial seal pressure imbalance causes to vacuumize work stoppage, and needs
Balance pipe is removed to carry out draining and delay the duration, and the technical problem that balance composite pipe tightness can not be ensured, realize whole
Draining is carried out to balance pipe incessantly in vacuum, to maintain main pump shaft to seal up downstream pressure balance, without tearing open repeatedly
Balance pipe is filled, reduces or avoids the problem of balance composite pipe tightness is impaired, it is ensured that the axle envelope pressure balance in whole process
Reliability.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
A kind of structured flowchart for nuclear power station main pump axial seal pressure bascule that Fig. 1 provides for background of invention；
Fig. 2 is the structured flowchart of the first nuclear power station main pump axial seal pressure bascule provided in an embodiment of the present invention；
Fig. 3 is the structured flowchart of second of nuclear power station main pump axial seal pressure bascule provided in an embodiment of the present invention；
Fig. 4 is the first nuclear power station main pump axial seal pressure balance method flow chart provided in an embodiment of the present invention；
Fig. 5 is second of nuclear power station main pump axial seal pressure balance method flow chart provided in an embodiment of the present invention；
Fig. 6 is the third nuclear power station main pump axial seal pressure balance method flow chart provided in an embodiment of the present invention.
Embodiment
The embodiment of the present invention is solved and deposited in the prior art by providing a kind of nuclear power station main pump axial seal pressure bascule
When being vacuumized in primary Ioops, because axle envelope balance pipe formation water seal so that main pump axial seal pressure imbalance causes to vacuumize work
Work suspends, and need to remove balance pipe progress draining and delay the duration, and the technical problem that balance composite pipe tightness can not be ensured, real
Show and draining is carried out to balance pipe incessantly in whole vacuum, to maintain main pump shaft to seal up downstream pressure balance,
Without repeated disassembled and assembled balance pipe, reduce or avoid the problem of balance composite pipe tightness is impaired, it is ensured that the axle envelope in whole process
The reliability of pressure balance.
The technical scheme of the embodiment of the present invention is in order to solve the above technical problems, general thought is as follows：
The embodiments of the invention provide a kind of nuclear power station main pump axial seal pressure bascule, the pressure equaliser bag
Include：For connecting the upstream flow in pipes of main pump axle envelope and the main pump axle envelope balance pipe of downstream leak conduit；It is arranged on the master
Below Pump Shaft Seal balance pipe, connected with the main pump axle envelope balance pipe, for the online draining of main pump axle envelope balance pipe
Header tank；It is connected with the main pump axle envelope balance pipe and the header tank, in the main pump axle envelope balance pipe draining and right
During primary Ioops are vacuumized, the displacement of the main pump axle envelope balance pipe and the header tank is controlled, so that the main pump
Axle envelope is in the valve member of pressure balance.
It can be seen that, in embodiments of the present invention, after main pump shaft seals up trip injection cut-out, pass through main pump axle envelope balance pipe and collection
Water tank carries out pipeline draining to main pump axle envelope；After the completion of the upstream flow in pipes draining, and the process that primary Ioops are vacuumized
In, the main pump axle envelope balance pipe is controlled to the header tank draining by valve member, to prevent the main pump axle envelope from balancing
Water seal phenomenon occurs when primary Ioops are vacuumized for pipe, and then the main pump axle envelope is in pressure balance；Efficiently solve
In the prior art when primary Ioops are vacuumized, because of the formation water seal of axle envelope balance pipe so that main pump axial seal pressure is uneven and leads
Cause vacuumizes work stoppage, and need to remove balance pipe progress draining and delay the duration, and balances what composite pipe tightness can not be ensured
Technical problem, realizes and carries out draining to balance pipe incessantly in whole vacuum, to maintain main pump shaft to seal up down
Pressure balance is swum, without repeated disassembled and assembled balance pipe, reduces or avoids the problem of balance composite pipe tightness is impaired, it is ensured that whole
During axle envelope pressure balance reliability.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper
State technical scheme to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application
The detailed description of technical scheme, rather than the restriction to technical scheme, in the case where not conflicting, the present invention is implemented
Technical characteristic in example and embodiment can be mutually combined.
First, Fig. 2 is refer to, it is described the embodiments of the invention provide a kind of nuclear power station main pump axial seal pressure bascule
Pressure equaliser includes：
For connecting the upstream flow in pipes of main pump axle envelope 100 and the main pump axle envelope balance pipe 10 of downstream leak conduit；
The lower section of main pump axle envelope balance pipe 10 is arranged on, is connected with main pump axle envelope balance pipe 10, for being balanced to main pump axle envelope
The header tank 20 of the online draining of pipe 10；
It is connected with main pump axle envelope balance pipe 10 and header tank 20, in the draining of main pump axle envelope balance pipe 10 and to primary Ioops
During vacuumizing, the displacement of control main pump axle envelope balance pipe 10 and header tank 20, so that main pump axle envelope 100 is in pressure
The valve member 30 of poised state.
In this programme, main pump axle envelope balance pipe must assure that into U-shaped layout, and header tank 20 must be necessarily arranged at balance pipe
Less than 10, it can certainly be flow in header tank 20 with the water ensured in balance pipe 10, will not remain to form water seal in the duct, with
Meet reliable hydrophobic and balance main pump shaft 100 upstream and downstream pressure of envelope the requirement of balance pipe 10；Wherein, it can be expired using header tank 20
The online drainage requirement of main pump axle envelope balance pipe 10 when sufficient primary Ioops are vacuumized, the pressure balance dress under different working condition
The presence of valve member 30 put, which is set, can ensure that balance pipe 10 will not destroy primary Ioops system while efficient draining
Vacuum.
In specific implementation process, Fig. 3 is refer to, main pump axle envelope balance pipe 10 includes：For connecting main pump axle envelope 100
Swim the first balance pipeline section 101 of flow in pipes；The second balance pipeline section 102 for connecting the downstream leak conduit of main pump axle envelope 100；
Be arranged on the bottom of the U-shaped layout, for connect first balance pipeline section 101, second balance pipeline section 102 and header tank 20 it is short
Pipe 103.
Further, referring still to Fig. 3, the pressure equaliser also includes：
The first pipeline 401 for connecting short tube 103 and header tank 20；The top of short tube 103 is arranged on, for connecting short tube
103 with first pair of vacant duct 402 of outside atmosphere；The top of header tank 20 is arranged on, for connecting header tank 20 and outside
Second pair of vacant duct 403 of air ambient；It is arranged on the lower section of header tank 20, the second pipe for discharging ponding in header tank 20
404。
Corresponding, valve member 30 includes：It is arranged on the first balance pipeline section 101, for controlling the upstream ascending pipe
The formal valve 301 in upstream of the connection of road and the first balance pipeline section 101；It is arranged on the second balance pipeline section 102, for controlling the
Two balance pipeline sections 102 and the formal valve 302 in downstream of the connection of the downstream leak conduit；It is arranged on first pair of vacant duct 402
On, for controlling short tube 103 and the first valve 303 of the connection of outside atmosphere；It is arranged on the first pipeline 401, is used for
Control main pump axle envelope balance pipe 10 and the second valve 304 of the connection of header tank 20；It is arranged on second pair of vacant duct 403, uses
In control header tank 20 and the 3rd valve 305 of the connection of outside atmosphere；It is arranged on second pipe 404, for controlling
4th valve 306 of the displacement of header tank 20.It is pointed out that all valves must assure that minimum in valve member 30
Can smoothly be opened and closed under the absolute vacuum pressure of 17000 handkerchiefs, and in off position under will not produce leakage.
In specific implementation process, the first balance balance pipeline section 102 of pipeline section 101 and second uses high pressure steel lining hose,
The absolute vacuum pressure of at least 17,000 handkerchiefs can be born, and deformation will not be produced, intensity is high, plasticity is good, is easy to according to existing
Field actual environment changes the trend of pipeline, and other pipelines use the pipeline of general kernel electric standard；Main pump axle envelope balance pipe
The connection of high pressure the steel liner tube and valve in device must assure that solid and reliable, effective sealing, to prevent air from being leaked from interface
Enter in device, the vacuum inside breaking plant.
Then, referring still to Fig. 3, the pressure equaliser also includes：It is arranged on header tank 20, is catchmented for monitoring
The liquid level gauge 50 of the water level of case 20, specifically, liquid level gauge 50 can be visual liquid level gauge, the connection of liquid level gauge 50 and header tank 20 must
Sealed reliable must be ensured, and be must assure that under vacuum conditions available.Header tank is monitored in real time by using visual liquid level gauge
20 water level, to carry out draining to header tank 20 at once when water level reaches limit value (the 8/9 of such as water tank capacity), prevents header tank
Cause to produce water seal in main pump axle envelope balance pipe 10 after 20 full waters, to ensure that the pressure at both sides of main pump axle envelope 100 is balanced.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of nuclear power station main pump axial seal pressure balance controlling party
Method, applied in above-mentioned nuclear power station main pump axial seal pressure bascule, refer to Fig. 4, the control method for pressure balance includes
Step：
S1, when the upstream of main pump axle envelope 100 inject cut off after, by main pump axle envelope balance pipe 10 and header tank 20 to main pump shaft
Envelope 100 carries out pipeline draining；
S2, after the completion of the upstream flow in pipes draining, and during primary Ioops are vacuumized, pass through valve member 30
The main pump axle envelope balance pipe 10 is controlled to the draining of header tank 20, to prevent the main pump axle envelope balance pipe 10 in primary Ioops
Water seal phenomenon occurs when vacuumizing, and then the main pump axle envelope 100 is in pressure balance.
In specific implementation process, before primary Ioops are vacuumized, it is necessary first to which the upstream injection of main pump axle envelope 100 is cut
It is disconnected, that is, stop, to the water filling of main pump axle envelope 100, then carrying out draining to the hydrophobic pipeline that is used for of main pump axle envelope 100, these are hydrophobic
Pipeline is connected with the upstream flow in pipes and downstream leak conduit of main pump axle envelope 100, when the pressure equaliser is as shown in Figure 3
When being connected to the upstream and downstream of main pump axle envelope 100, the formal valve 301 in upstream, the first valve 303, the second valve the 304, the 3rd are opened
The valve 306 of valve 305 and the 4th, to carry out pipeline row to main pump axle envelope 100 by main pump axle envelope balance pipe 10 and header tank 20
Water (is illustrated) to above-mentioned steps S1.
Then above-mentioned steps S2 is performed, Fig. 3 and Fig. 5 is refer to, the step S2 specifically includes sub-step：
S21, after the completion of the upstream flow in pipes draining, close the formal valve 301 in upstream, first valve
303rd, second valve 304, the 3rd valve 305 and the 4th valve 306；
S22, during primary Ioops are vacuumized, control second valve 304 to be in opening, and described first
Valve 303, the 3rd valve 305 and the 4th valve 306 are remained off, so that the main pump axle envelope balance pipe 10
To the draining of header tank 20, and prevent the main pump axle envelope balance pipe 10 from occurring water seal phenomenon, and then make the main pump axle envelope
100 are in pressure balance.
In specific implementation process, due to factors such as layout of beam line and air pressure insides, before primary Ioops are vacuumized, perform
Step S1 is that the water in the pipeline of main pump axle envelope 100 can not be completely exhausted out, therefore when primary Ioops are vacuumized, is deposited in pipeline
The water stayed will be flowed into Action of Gravity Field in main pump axle envelope balance pipe 10, in order to carry out draining to balance pipe 10 by header tank 20
While, maintain the vacuum environment in balance pipe 10 not to be destroyed, only need to open the second valve 304 makes balance pipe 10 and header tank
20 connections, and other valves all remain off state.
In specific implementation process, Fig. 6 is refer to, step S22 includes following sub-step：
S221, during primary Ioops are vacuumized, control second valve 304 to be in opening, and described the
One valve 303, the 3rd valve 305 and the 4th valve 306 are remained off, so that the main pump axle envelope balance pipe
10 to the draining of header tank 20, and monitors by liquid level gauge 50 water level of the header tank 20；
S222, when the liquid level gauge 50 monitors and obtains the water level of the header tank 20 and reach preset water level, in primary Ioops
In the case of vacuumizing incessantly, second valve 304 is closed, and controls to open the 3rd valve 305 and the described 4th
Valve 306, to carry out draining to the header tank 20；
S223, after the completion of the draining of header tank 20, close the 3rd valve 305 and the 4th valve 306, and
Second valve 304 is slowly opened, so that the main pump axle envelope balance pipe 10 is connected again with the header tank 20, to prevent
Water seal phenomenon occurs for the main pump axle envelope balance pipe 10, and then the main pump axle envelope 100 is in pressure balance.
In specific implementation process, the water that balance pipe 10 is discharged into header tank 20 is not to arrange outward in real time, and header tank 20 has
There is certain capacity, during balance pipe 10 is to the draining of header tank 20, by liquid level gauge 50 in real time monitoring header tank 20
Water level, when the water level reaches the limit value of header tank 20 (will influence pressure balanced water level critical point in balance pipe 10), will
Connecting pipe (i.e. the first pipeline 401) between balance pipe 10 and header tank 20 is blocked, to ensure in balance pipe 10 and primary Ioops
Vacuum environment be not destroyed, while opening the 3rd valve 305 and the 4th valve 306, draining is carried out to header tank 20.Catchmenting
After the draining of case 20 is finished, the 3rd valve 305 and the 4th valve 306 closed on header tank 20, and connected set water tank 20 again
With balance pipe 10, it in atmospheric pressure, axle envelope balance pipe 10 is vacuum to be due to the pressure in now header tank 20, in order to balance axle envelope
Pressure change in balance pipe 10 and header tank 20, the second valve 304 has to slow unlatching, prevents that pressure transient causes
Device damage, and the vacuum in destruction of balance pipe.It is pointed out that header tank 20 is blocked and draining with balance pipe 10, to collection
Ponding in this period that the draining of water tank 20 is finished and connected again with balance pipe 10, balance pipe 10 is unlikely to destroy main pump shaft
Seal 100 pressure at both sides balance.
Further, it is necessary to the operation principle of the valve 305 of second pair of vacant duct 403 and the 3rd set to the top of header tank 20
Illustrate：When primary Ioops are vacuumized and balance pipe 10 is connected with header tank 20, the 3rd valve 305 and the 4th valve are closed
306, to ensure the inner vacuum environment of header tank 20 and balance pipe 10, and ensure that header tank 20 will not during vacuumizing
Gas leakage；And then, the water level in header tank 20 is too high, and punctuated equilibrium pipe 10 and header tank 20, and header tank 20 is carried out
During draining, the pressure inside header tank 20 is less than the pressure in drainage pipeline (i.e. second pipe 404), can cause impeded drainage,
The 3rd valve 305 now opened on second pair of vacant duct 403 makes the top of header tank 20 be communicated with atmospheric environment, helps to catchment
The smooth discharge of ponding in case 20.
Setting purposes similarly for the valve 303 of first pair of vacant duct 402 and first on short tube 103 is similar, i.e.,
Perform step S1：When carrying out pipeline draining to main pump axle envelope balance pipe 10 before primary Ioops are vacuumized, the first valve 303 is opened,
Contribute to main pump axle envelope balance pipe 10 is smooth to obtain to the draining of header tank 20, meanwhile, the 3rd valve 305 on header tank 20 is opened,
The water that contributes in header tank 20 is smooth to be discharged by second pipe 404.Certainly, it is necessary during primary Ioops are vacuumized
Ensure that the first valve 303 is closed, prevent vacuum to be destroyed.
It is pointed out that during primary Ioops are vacuumized, execution time sub-step S221~S223 so repeatedly,
It may be implemented in the case of vacuum pumping incessantly, the draining to main pump axle envelope balance pipe 10 completed, to maintain main pump axle envelope
100 pressure at both sides are balanced.
In a word, by implementing the present invention program, it is to avoid in RCP system vacuums because main pump axle envelope pressure difference is too low and
Caused pause vacuum pumping, and avoid to remove axle envelope balance pipe and carry out the operation of draining and (removed in vacuum
Vacuumize outer time-consuming operation at most itself), realize averagely can save the pumpdown time technology effect of at least 1.5 hours
Really.Further, the main pump axial seal pressure bascule in the present invention program can be maintained incessantly in whole vacuum
Main pump shaft seals up downstream pressure balance, due to need not be to the formal valve in upstream and downstream of main pump axle envelope during vacuumizing
Operated, it is to avoid main pump axle envelope pressure difference caused by valve operation mistake when conventional axial seal pressure bascule is because of draining
The risk that transient fluctuation is brought, it also avoid the influence to the registration of differential pressure indicator in the formal circuit of main pump axle envelope, it is ensured that whole
The reliability that axle envelope pressure difference is monitored during individual, the RCP main pump axle envelopes pressure difference that realizes truly is monitored and pressure difference limit value
Protection and primary Ioops vacuum pumping complete independently, the effect being independent of each other.
As described above, above-mentioned nuclear power station main pump axial seal pressure balance control method is applied to above-mentioned nuclear power station main pump
In axial seal pressure balance control device, so, the implementation process of this method is consistent with one or more embodiments of said apparatus,
Just no longer repeat one by one herein.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (11)
1. a kind of nuclear power station main pump axial seal pressure bascule, it is characterised in that the pressure equaliser includes：
For connecting the upstream flow in pipes of main pump axle envelope (100) and the main pump axle envelope balance pipe (10) of downstream leak conduit；
It is arranged on below the main pump axle envelope balance pipe (10), is connected with the main pump axle envelope balance pipe (10), for described
In the header tank (20) of the online draining of main pump axle envelope balance pipe (10), the main pump axle envelope balance pipe (10) of U-shaped layout
Water is flow in the header tank (20) certainly, it is to avoid the residual in pipeline forms water seal；
It is connected with the main pump axle envelope balance pipe (10) and the header tank (20), in the main pump axle envelope balance pipe (10)
Draining and during being vacuumized to primary Ioops, controls the draining of the main pump axle envelope balance pipe (10) and the header tank (20)
Amount, so that the main pump axle envelope (100) is in the valve member (30) of pressure balance.
2. main pump axial seal pressure bascule as claimed in claim 1, it is characterised in that the main pump axle envelope balance pipe (10)
Including：
The first balance pipeline section (101) for connecting main pump axle envelope (100) upstream flow in pipes；
The second balance pipeline section (102) for connecting main pump axle envelope (100) downstream leak conduit；
The bottom of the U-shaped layout is arranged on, for connecting the first balance pipeline section (101), the second balance pipeline section
(102) and the header tank (20) short tube (103).
3. main pump axial seal pressure bascule as claimed in claim 2, it is characterised in that the pressure equaliser is also wrapped
Include：
The first pipeline (401) for connecting the short tube (103) and the header tank (20)；
It is arranged on above the short tube (103), first pair of vacant duct for connecting the short tube (103) and outside atmosphere
(402)；
It is arranged on above the header tank (20), second pair of blank pipe for connecting the header tank (20) and outside atmosphere
Road (403)；
It is arranged on below the header tank (20), the second pipe (404) for discharging ponding in the header tank (20).
4. main pump axial seal pressure bascule as claimed in claim 3, it is characterised in that the valve member (30) includes：
It is arranged on the first balance pipeline section (101), for controlling the upstream flow in pipes and the described first balance pipeline section
(101) the formal valve in upstream (301) of connection；
It is arranged on the second balance pipeline section (102), for controlling the second balance pipeline section (102) and the downstream aerial drainage
The formal valve in downstream (302) of the connection of pipeline；
It is arranged on first pair of vacant duct (402), for controlling the short tube (103) and the connection of outside atmosphere
First valve (303)；
It is arranged on first pipeline (401), for controlling the main pump axle envelope balance pipe (10) and the header tank (20)
Connection the second valve (304)；
It is arranged on second pair of vacant duct (403), the connection for controlling the header tank (20) and outside atmosphere
The 3rd valve (305)；
It is arranged on the second pipe (404), the 4th valve (306) of the displacement for controlling the header tank (20).
5. main pump axial seal pressure bascule as claimed in claim 1, it is characterised in that the pressure equaliser is also wrapped
Include：
It is arranged on the header tank (20), the liquid level gauge (50) of the water level for monitoring the header tank (20).
6. the main pump axial seal pressure bascule as described in any claim of claim 2~5, it is characterised in that described first is flat
Pipeline section (101) and the second balance pipeline section (102) weigh using high pressure steel lining hose, the high pressure the steel liner tube can bear to
The absolute vacuum pressure of few 17,000 handkerchiefs.
7. main pump axial seal pressure bascule as claimed in claim 1, it is characterised in that own in the valve member (30)
Valve can be normally-open under the absolute vacuum pressure of minimum 17,000 handkerchief or closed.
8. a kind of nuclear power station main pump axial seal pressure balance control method, applied in nuclear power station main pump axial seal pressure bascule,
Characterized in that, the control method for pressure balance includes step：
S1, when main pump axle envelope (100) upstream inject cut off after, by main pump axle envelope balance pipe (10) and header tank (20) to main pump
Axle envelope (100) carries out pipeline draining；
S2, after the completion of the upstream flow in pipes draining, and during primary Ioops are vacuumized, pass through valve member (30) and control
The main pump axle envelope balance pipe (10) is made to the header tank (20) draining, to prevent the main pump axle envelope balance pipe (10) one
Water seal phenomenon occurs during vacuum-pumping loop, and then the main pump axle envelope (100) is in pressure balance.
9. main pump axial seal pressure balance control method as claimed in claim 8, it is characterised in that the step S1 is specially：
After main pump axle envelope (100) upstream, which is injected, to cut off, the formal valve in upstream (301), the first valve (303), the second valve are opened
Door (304), the 3rd valve (305) and the 4th valve (306), with by main pump axle envelope balance pipe (10) and header tank (20) to master
Pump Shaft Seal (100) carries out pipeline draining.
10. main pump axial seal pressure balance control method as claimed in claim 9, it is characterised in that the step S2 is specifically wrapped
Include：
S21, after the completion of the upstream flow in pipes draining, close the formal valve in upstream (301), first valve
(303), second valve (304), the 3rd valve (305) and the 4th valve (306)；
S22, during primary Ioops are vacuumized, control second valve (304) to be in opening, and first valve
Door (303), the 3rd valve (305) and the 4th valve (306) remain off, so that the main pump axle envelope is balanced
(10) are managed to the header tank (20) draining, and prevent the main pump axle envelope balance pipe (10) from occurring water seal phenomenon, and then make institute
State main pump axle envelope (100) and be in pressure balance.
11. main pump axial seal pressure balance control method as claimed in claim 10, it is characterised in that the step S22 is specific
Including：
S221, during primary Ioops are vacuumized, control second valve (304) to be in opening, and described first
Valve (303), the 3rd valve (305) and the 4th valve (306) remain off, so that the main pump axle envelope is flat
Weighing apparatus pipe (10) passes through the water level of liquid level gauge (50) the monitoring header tank (20) to header tank (20) draining；
S222, when the liquid level gauge (50) monitors and obtains the water level of the header tank (20) and reach preset water level, in primary Ioops
In the case of vacuumizing incessantly, second valve (304) is closed, and controls to open the 3rd valve (305) and described
4th valve (306), to carry out draining to the header tank (20)；
S223, after the completion of the header tank (20) draining, close the 3rd valve (305) and the 4th valve (306),
And second valve (304) is slowly opened, so that the main pump axle envelope balance pipe (10) connects again with the header tank (20)
It is logical, to prevent the main pump axle envelope balance pipe (10) from occurring water seal phenomenon, and then make the main pump axle envelope (100) flat in pressure
Weighing apparatus state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144555.8A CN104733059B (en) | 2015-03-30 | 2015-03-30 | A kind of nuclear power station main pump axial seal pressure bascule and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510144555.8A CN104733059B (en) | 2015-03-30 | 2015-03-30 | A kind of nuclear power station main pump axial seal pressure bascule and method |
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| CN104733059A CN104733059A (en) | 2015-06-24 |
| CN104733059B true CN104733059B (en) | 2017-10-31 |
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| CN112191287B (en) * | 2020-09-30 | 2021-11-02 | 中国核动力研究设计院 | Full-automatic release mechanism for high-temperature melt and control method thereof |
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