CN104733059A - Main pump shaft seal pressure balancing device and method for nuclear power station - Google Patents
Main pump shaft seal pressure balancing device and method for nuclear power station Download PDFInfo
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- CN104733059A CN104733059A CN201510144555.8A CN201510144555A CN104733059A CN 104733059 A CN104733059 A CN 104733059A CN 201510144555 A CN201510144555 A CN 201510144555A CN 104733059 A CN104733059 A CN 104733059A
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- main pump
- shaft seal
- pump shaft
- valve
- balance
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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
Abstract
The invention discloses a main pump shaft seal pressure balancing device and a main pump shaft seal pressure balancing method for a nuclear power station, and solves the technical problem that when a primary coolant circuit vacuumizes, water seal is formed by a shaft seal balance pipe to enable the main pump shaft seal pressure to be unbalanced, and the balance pipe needs to be dismounted for drainage by stopping vacuumizing, and consequently, the project is delayed in the prior art. The pressure balancing device comprises a main pump shaft seal balance pipe (10), a water collection box (20) arranged under the balance pipe (10) and a valve assembly (30) which is connected with the main pump shaft seal balance pipe (10) and the water collection box (20) and used for controlling the water drainage quantity of the main pump shaft seal balance pipe (10) and the water collection box (20) to ensure that the main pump shaft seal is in a pressure balance state. According to the pressure balancing device, the drainage of the shaft seal balance pipe is continuously carried out in a whole vacuumizing process to maintain the pressure balance of an upstream and a downstream of the main pump shaft seal, and the repeated mounting and dismounting of the balance pipe is not needed, so that the phenomenon that the sealing property of the balance pipe is damaged is reduced or avoided, and the reliability of the main pump shaft seal differential pressure balance in a whole process can be guaranteed.
Description
Technical field
The present invention relates to nuclear power station main pump axial seal pressure balancing technique field, particularly relate to a kind of nuclear power station main pump axial seal pressure balance device and method.
Background technology
Current China fortune or at the nuclear power station built based on presurized water reactor, type belongs to second generation nuclear power technology or its modified, and the scale of unit is not from 300,000 ~ 1,000,000 kW etc.Main pump is rotary machine equipment unique in reactor coolant loop.Packoff (i.e. main pump shaft seal) between the pump shaft rotated and fixed pump shell, in order to limit the leakage of the radioactive cooling medium of High Temperature High Pressure band to containment.For high-tension apparatus, sealing is an important technology.
According to the requirement of pressurized-water reactor nuclear power plant debugging test, in the starting stage of cold conditions function test and hot function test, all need be full of water to primary Ioops and be vented fully, until primary Ioops air content is qualified, namely meets primary Ioops surplus air volume and be less than 21 standard rice (Nm
3) requirement, wherein comprise vacuum pumping in primary Ioops exhaust process.Due to reactor coolant loop (RCP; Reactor CoolantSystem) main pump shaft seal can not bear reverse differential pressure; namely the downstream leak conduit pressure of main pump shaft seal can not be greater than its upper reaches flow in pipes pressure; otherwise the seal face of main pump shaft seal has dislocation risk; and sealing cannot be guaranteed; so need to carry out upstream and downstream pressure equilibrium protection to main pump shaft seal in the process of this vacuum pumping, the upstream and downstream pipeline pressure reduction of balance main pump shaft seal, to avoid occurring reverse differential pressure.Concrete, the existing main pump shaft that realizes seals up the method for pressure difference downstream balance as shown in Figure 1, for a main pump, namely high-pressure hose (also claiming shaft seal balance pipe) 2 is used to be communicated with the upstream and downstream (i.e. between the upstream flow in pipes of No. one, main pump sealing 1 and downstream leak conduit) of the differential pressure indicator of No. one, main pump sealing 1, make main pump shaft seal 1 pressure at both sides balance, usual shaft seal balance pipe 2 is also provided with the hydrophobic valve for balance pipe 2 draining and drain tap.
But, adopt existing this main pump shaft seal pressure balance device and method, some problems can be met at the scene: vacuumizing early stage when practical operation, during primary Ioops water inlet, a shaft seal of main pump carries out water supply by nuclear island demineralized water distribution system (SED), though stop injecting demineralized water to shaft seal during vacuumizing, but due to the reason such as layout of shaft seal pipeline, can remaining more water in shaft seal pipeline; And when primary Ioops vacuumizes, these residual water can enter in balance pipe 2, balance pipe 2 is made to lose the effect of balance No. one, main pump sealing pressure at both sides; Must vacuum pumping be stopped when this condition is met, separation valve door, remove shaft seal balance pipe 2, the water in balance pipe 2 is got rid of.According to practical operation experience, need balance pipe 2 draining 2-3 time during vacuumizing at every turn, cause affecting the time that critical path runs 1-3 hour.Further, carry out draining due to shaft seal balance pipe 2 need be removed, and gas leakage equivalent risk may be brought for shaft seal balance pipe 2 when repeatedly repeating this operation, make primary Ioops vacuumize work and need repeat pressurize, and delay the duration.
Visible, existing when primary Ioops vacuumizes in prior art, because forming water seal in shaft seal balance pipe, making main pump shaft seal upstream and downstream pressure imbalance cause vacuumizing work stoppage, and balance pipe need be removed carry out draining, and delay the technical matters of duration; In addition, also exist in prior art due to balance pipe repeated disassembled and assembled, the technical matters that its sealing cannot be protected.
Summary of the invention
The present invention is directed to and to exist in prior art, when primary Ioops vacuumizes, because shaft seal balance pipe forms water seal, main pump shaft seal pressure imbalance is made to cause vacuumizing work stoppage, and balance pipe need be removed carry out draining and delay the duration, and the technical matters that balance pipe sealing cannot ensure, a kind of nuclear power station main pump axial seal pressure balance device and method are provided, achieve and incessantly draining is carried out to balance pipe in whole vacuum, downstream pressure balance is sealed up to maintain main pump shaft, without the need to repeated disassembled and assembled balance pipe, reduce or avoid the impaired problem of balance pipe sealing, ensure that the reliability of shaft seal pressure balance in whole process.
On the one hand, embodiments provide a kind of nuclear power station main pump axial seal pressure balance device, described pressure equaliser comprises:
For the main pump shaft seal balance pipe of the upstream flow in pipes and downstream leak conduit that are communicated with main pump shaft seal;
Be arranged on below described main pump shaft seal balance pipe, be communicated with described main pump shaft seal balance pipe, for the header tank to the online draining of described main pump shaft seal balance pipe;
Be connected with described main pump shaft seal balance pipe and described header tank, for in described main pump shaft seal balance pipe draining and the process that vacuumizes primary Ioops, control the water discharge of described main pump shaft seal balance pipe and described header tank, be in the valve member of pressure balance to make described main pump shaft seal.
Optionally, the U-shaped layout of described main pump shaft seal balance pipe, described main pump shaft seal balance pipe comprises:
The first balance pipeline section of trip flow in pipes is sealed up for being communicated with main pump shaft;
For being communicated with the second balance pipeline section of main pump shaft seal downstream leak conduit;
Be arranged on the bottom of described U-shaped layout, for being communicated with the short tube of described first balance pipeline section, described second balance pipeline section and described header tank.
Optionally, described pressure equaliser also comprises:
For being communicated with the first pipeline of described short tube and described header tank;
Be arranged on above described short tube, for being communicated with first pair of vacant duct of described short tube and outside atmosphere;
Be arranged on above described header tank, for being communicated with second pair of vacant duct of described header tank and outside atmosphere;
Be arranged on below described header tank, for discharging the second pipe of ponding in described header tank.
Optionally, described valve member comprises:
Being arranged on described first balance pipeline section, balancing the formal valve in the upstream be communicated with of pipeline section for controlling described upstream flow in pipes and described first;
Be arranged on described second balance pipeline section, for controlling the formal valve in the downstream be communicated with of described second balance pipeline section and described downstream leak conduit;
Be arranged on described first pair of vacant duct, for controlling first valve be communicated with of described short tube and outside atmosphere;
Be arranged on described first pipeline, for controlling second valve be communicated with of described main pump shaft seal balance pipe and described header tank;
Be arranged on described second pair of vacant duct, for controlling the 3rd valve be communicated with of described header tank and outside atmosphere;
Be arranged on described second pipe, for controlling the 4th valve of the water discharge of described header tank.
Optionally, described pressure equaliser also comprises:
Be arranged on described header tank, for monitoring the liquid level gauge of the water level of described header tank.
Optionally, described first balance pipeline section and described second balance pipeline section all adopt high pressure steel lining hose, and described high pressure steel bushing pipe can bear the absolute vacuum pressure of at least 170 hundred handkerchiefs.
Optionally, in described valve member, all valves all can normally be opened or close under the absolute vacuum pressure of minimum 17,000 handkerchiefs.
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, and be applied in nuclear power station main pump axial seal pressure balance device, described control method for pressure balance comprises step:
S1, when main pump shaft seal up trip inject cut off after, by main pump shaft seal balance pipe and header tank, pipeline draining is carried out to main pump shaft seal;
S2, after the flow in pipes draining of described upstream completes, and in the process that vacuumizes of primary Ioops, described main pump shaft seal balance pipe is controlled to described header tank draining by valve member, to prevent described main pump shaft seal balance pipe from when primary Ioops vacuumizes, water seal phenomenon occurring, and then described main pump shaft seal is made to be in pressure balance.
Optionally, described step S1 is specially:
After main pump shaft seals up trip injection cut-out, open the formal valve in upstream, the first valve, the second valve, the 3rd valve and the 4th valve, to carry out pipeline draining by main pump shaft seal balance pipe and header tank to main pump shaft seal.
Optionally, described step S2 specifically comprises:
S21, after the flow in pipes draining of described upstream completes, close the formal valve in described upstream, described first valve, described second valve, described 3rd valve and described 4th valve;
In S22, the process that vacuumizes when primary Ioops, control described second valve and be in opening, and described first valve, described 3rd valve and described 4th valve keep closed condition, to make described main pump shaft seal balance pipe to described header tank draining, and prevent described main pump shaft seal balance pipe generation water seal phenomenon, and then described main pump shaft seal is made to be in pressure balance.
Optionally, described step S22 specifically comprises:
In S221, the process that vacuumizes when primary Ioops, control described second valve and be in opening, and described first valve, described 3rd valve and described 4th valve keep closed condition, to make described main pump shaft seal balance pipe to header tank draining, and monitored the water level of described header tank by liquid level gauge;
S222, when the water level that the monitoring of described liquid level gauge obtains described header tank reaches preset water level, vacuumize incessantly in situation at primary Ioops, close described second valve, and control to open described 3rd valve and described 4th valve, to carry out draining to described header tank;
S223, after described header tank draining completes, close described 3rd valve and described 4th valve, and slowly open described second valve, again be communicated with described header tank to make described main pump shaft seal balance pipe, to prevent described main pump shaft seal balance pipe generation water seal phenomenon, and then described main pump shaft seal is made to be in pressure balance.
One or more technical schemes that the embodiment of the present invention provides, at least have following technique effect or advantage:
Due in embodiments of the present invention, main pump shaft seal pressure balance device comprises: for the main pump shaft seal balance pipe of the upstream flow in pipes and downstream leak conduit that are communicated with main pump shaft seal; Be arranged on below described main pump shaft seal balance pipe, be communicated with described main pump shaft seal balance pipe, for the header tank to the online draining of described main pump shaft seal balance pipe; Be connected with described main pump shaft seal balance pipe and described header tank, for in described main pump shaft seal balance pipe draining and the process that vacuumizes primary Ioops, control the water discharge of described main pump shaft seal balance pipe and described header tank, be in the valve member of pressure balance to make described main pump shaft seal.That is, after main pump shaft seals up trip injection cut-out, by main pump shaft seal balance pipe and header tank, pipeline draining is carried out to main pump shaft seal, after the flow in pipes draining of described upstream completes, and in the process that vacuumizes of primary Ioops, described main pump shaft seal balance pipe is controlled to described header tank draining by valve member, to prevent described main pump shaft seal balance pipe from when primary Ioops vacuumizes, water seal phenomenon occurring, and then described main pump shaft seal is made to be in pressure balance, to efficiently solve in prior art when primary Ioops vacuumizes, because shaft seal balance pipe forms water seal, main pump shaft seal pressure imbalance is made to cause vacuumizing work stoppage, and balance pipe need be removed carry out draining and delay the duration, and the technical matters that balance pipe sealing cannot ensure, achieve and incessantly draining is carried out to balance pipe in whole vacuum, downstream pressure balance is sealed up to maintain main pump shaft, without the need to repeated disassembled and assembled balance pipe, reduce or avoid the impaired problem of balance pipe sealing, ensure that the reliability of shaft seal pressure balance in whole process.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structured flowchart of a kind of nuclear power station main pump axial seal pressure balance device that Fig. 1 provides for background technology of the present invention;
The structured flowchart of the first nuclear power station main pump axial seal pressure balance device that Fig. 2 provides for the embodiment of the present invention;
The structured flowchart of the second nuclear power station main pump axial seal pressure balance device that Fig. 3 provides for the embodiment of the present invention;
The first nuclear power station main pump axial seal pressure balance method process flow diagram that Fig. 4 provides for the embodiment of the present invention;
The second nuclear power station main pump axial seal pressure balance method process flow diagram that Fig. 5 provides for the embodiment of the present invention;
The third nuclear power station main pump axial seal pressure balance method process flow diagram that Fig. 6 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention is by providing a kind of nuclear power station main pump axial seal pressure balance device, solve exist in prior art when primary Ioops vacuumizes, because shaft seal balance pipe forms water seal, main pump shaft seal pressure imbalance is made to cause vacuumizing work stoppage, and balance pipe need be removed carry out draining and delay the duration, and the technical matters that balance pipe sealing cannot ensure, achieve and incessantly draining is carried out to balance pipe in whole vacuum, downstream pressure balance is sealed up to maintain main pump shaft, without the need to repeated disassembled and assembled balance pipe, reduce or avoid the impaired problem of balance pipe sealing, ensure that the reliability of shaft seal pressure balance in whole process.
The technical scheme of the embodiment of the present invention is for solving the problems of the technologies described above, and general thought is as follows:
Embodiments provide a kind of nuclear power station main pump axial seal pressure balance device, described pressure equaliser comprises: for the main pump shaft seal balance pipe of the upstream flow in pipes and downstream leak conduit that are communicated with main pump shaft seal; Be arranged on below described main pump shaft seal balance pipe, be communicated with described main pump shaft seal balance pipe, for the header tank to the online draining of described main pump shaft seal balance pipe; Be connected with described main pump shaft seal balance pipe and described header tank, for in described main pump shaft seal balance pipe draining and the process that vacuumizes primary Ioops, control the water discharge of described main pump shaft seal balance pipe and described header tank, be in the valve member of pressure balance to make described main pump shaft seal.
Visible, in embodiments of the present invention, after main pump shaft seals up trip injection cut-out, by main pump shaft seal balance pipe and header tank, pipeline draining is carried out to main pump shaft seal, after the flow in pipes draining of described upstream completes, and in the process that vacuumizes of primary Ioops, described main pump shaft seal balance pipe is controlled to described header tank draining by valve member, to prevent described main pump shaft seal balance pipe from when primary Ioops vacuumizes, water seal phenomenon occurring, and then described main pump shaft seal is made to be in pressure balance, to efficiently solve in prior art when primary Ioops vacuumizes, because shaft seal balance pipe forms water seal, make main pump shaft seal pressure uneven and cause vacuumizing work stoppage, and balance pipe need be removed carry out draining and delay the duration, and the technical matters that balance pipe sealing cannot ensure, achieve and incessantly draining is carried out to balance pipe in whole vacuum, downstream pressure balance is sealed up to maintain main pump shaft, without the need to repeated disassembled and assembled balance pipe, reduce or avoid the impaired problem of balance pipe sealing, ensure that the reliability of shaft seal pressure balance in whole process.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail, the specific features being to be understood that in the embodiment of the present invention and embodiment is the detailed description to technical scheme, instead of the restriction to technical scheme, when not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
First, please refer to Fig. 2, embodiments provide a kind of nuclear power station main pump axial seal pressure balance device, described pressure equaliser comprises:
For the main pump shaft seal balance pipe 10 of the upstream flow in pipes and downstream leak conduit that are communicated with main pump shaft seal 100;
Be arranged on below main pump shaft seal balance pipe 10, be communicated with main pump shaft seal balance pipe 10, for the header tank 20 to the online draining of main pump shaft seal balance pipe 10;
Be connected with main pump shaft seal balance pipe 10 and header tank 20, for in balance pipe 10 draining of main pump shaft seal and the process that vacuumizes primary Ioops, control the water discharge of main pump shaft seal balance pipe 10 and header tank 20, with the valve member 30 making main pump shaft seal 100 be in pressure balance.
In this programme, main pump shaft seal balance pipe must ensure into U-shaped layout, and header tank 20 must be arranged in balance pipe less than 10, to ensure that the water in balance pipe 10 can flow in header tank 20 certainly, can not remain in the duct and form water seal, with meet balance pipe 10 reliably hydrophobic and balance main pump shaft seal the requirement of 100 upstream and downstream pressure; Wherein, utilize header tank 20 can meet the online drainage requirement of main pump shaft seal balance pipe 10 when primary Ioops vacuumizes, under different operating state, valve member 30 presence of described pressure equaliser arranges and can ensure that balance pipe 10 can not destroy primary Ioops system vacuum while efficient draining.
In specific implementation process, please refer to Fig. 3, main pump shaft seal balance pipe 10 comprises: for being communicated with the first balance pipeline section 101 of main pump shaft seal 100 upstream flow in pipes; For being communicated with the second balance pipeline section 102 of main pump shaft seal 100 downstream leak conduit; Being arranged on the bottom of described U-shaped layout, balancing the short tube 103 of pipeline section 102 and header tank 20 for being communicated with the first balance pipeline section 101, second.
Further, still please refer to Fig. 3, described pressure equaliser also comprises:
For being communicated with the first pipeline 401 of short tube 103 and header tank 20; Be arranged on above short tube 103, for being communicated with first pair of vacant duct 402 of short tube 103 and outside atmosphere; Be arranged on above header tank 20, for the second pair vacant duct 403 of connected set water tank 20 with outside atmosphere; Be arranged on below header tank 20, for discharging the second pipe 404 of ponding in header tank 20.
Corresponding, valve member 30 comprises: be arranged on the first balance pipeline section 101, balances the formal valve 301 in the upstream be communicated with of pipeline section 101 for controlling described upstream flow in pipes and first; Be arranged on the second balance pipeline section 102, for controlling the second balance pipeline section 102 valve 302 formal with the downstream be communicated with of described downstream leak conduit; Be arranged on first pair of vacant duct 402, for controlling first valve 303 be communicated with of short tube 103 and outside atmosphere; Be arranged on the first pipeline 401, for controlling second valve 304 be communicated with of main pump shaft seal balance pipe 10 and header tank 20; Be arranged on second pair of vacant duct 403, for three valve 305 that be communicated with of domination set water tank 20 with outside atmosphere; Be arranged on second pipe 404, for the 4th valve 306 of the water discharge of domination set water tank 20.It is pointed out that in valve member 30, all valves must ensure can open and close smoothly under the absolute vacuum pressure of minimum 17,000 handkerchiefs, and in off position under can not produce leakage.
In specific implementation process, first balance pipeline section 101 and the second balance pipeline section 102 all adopt high pressure steel lining hose, the absolute vacuum pressure of at least 170 hundred handkerchiefs can be born, and can not deformation be produced, intensity is high, plasticity good, be convenient to the trend according to on-the-spot actual environment change pipeline, and other pipeline adopts the pipeline of general kernel electric standard; High pressure steel bushing pipe in main pump shaft seal balance pipe apparatus and the connection of valve must ensure solid and reliable, effective sealing, to prevent air from interface bleeder, and the vacuum of breaking plant inside.
Then, still please refer to Fig. 3, described pressure equaliser also comprises: be arranged on header tank 20, for monitoring the liquid level gauge 50 of the water level of header tank 20, concrete, liquid level gauge 50 can be visual liquid level gauge, and liquid level gauge 50 and the connection of header tank 20 must be guaranteed to seal reliably, and must ensure available under vacuum conditions.By utilizing the water level of visual liquid level gauge real time monitoring header tank 20, at once draining is carried out to header tank 20 during to reach limit value (as 8/9 of water tank capacity) at water level, cause after preventing header tank 20 full water producing water seal in main pump shaft seal balance pipe 10, to guarantee that main pump shaft seal 100 pressure at both sides balances.
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 control method, and be applied in above-mentioned nuclear power station main pump axial seal pressure balance device, please refer to Fig. 4, described control method for pressure balance comprises step:
S1, when main pump shaft seal 100 upstream inject cut off after, carry out pipeline draining by main pump shaft seal balance pipe 10 and header tank 20 pairs of main pump shaft seals 100;
S2, after the flow in pipes draining of described upstream completes, and in the process that vacuumizes of primary Ioops, described main pump shaft seal balance pipe 10 is controlled to the draining of described header tank 20 by valve member 30, to prevent described main pump shaft seal balance pipe 10 from when primary Ioops vacuumizes, water seal phenomenon occurring, and then described main pump shaft seal 100 is made to be in pressure balance.
In specific implementation process, before primary Ioops vacuumizes, first need the upstream of main pump shaft seal 100 to inject to cut off, namely stop to main pump shaft seal 100 water filling, then draining is carried out to main pump shaft seal 100 for hydrophobic pipeline, these hydrophobic pipelines are communicated with downstream leak conduit with the upstream flow in pipes of main pump shaft seal 100, when described pressure equaliser is connected to the upstream and downstream of main pump shaft seal 100 as shown in Figure 3, open the formal valve 301 in upstream, first valve 303, second valve 304, 3rd valve 305 and the 4th valve 306, to carry out pipeline draining (illustrating namely to above-mentioned steps S1) by main pump shaft seal balance pipe 10 and header tank 20 pairs of main pump shaft seals 100.
Then perform above-mentioned steps S2, please refer to Fig. 3 and Fig. 5, described step S2 specifically comprises sub-step:
S21, after the flow in pipes draining of described upstream completes, close the formal valve in described upstream 301, described first valve 303, described second valve 304, described 3rd valve 305 and described 4th valve 306;
In S22, the process that vacuumizes when primary Ioops, control described second valve 304 and be in opening, and described first valve 303, described 3rd valve 305 and described 4th valve 306 keep closed condition, to make described main pump shaft seal balance pipe 10 to the draining of described header tank 20, and prevent described main pump shaft seal balance pipe 10 from water seal phenomenon occurring, and then described main pump shaft seal 100 is made to be in pressure balance.
In specific implementation process, due to the factor such as layout of beam line and air pressure inside, before primary Ioops vacuumizes, perform step S1 to discharge completely the water in the pipeline of main pump shaft seal 100, therefore when primary Ioops vacuumizes, the water retained in pipeline will flow in main pump shaft seal balance pipe 10 with Action of Gravity Field, in order to while carrying out draining by header tank 20 pairs of balance pipes 10, the vacuum environment maintained in balance pipe 10 is not destroyed, only need open the second valve 304 makes balance pipe 10 be communicated with header tank 20, and other valve all maintains closed condition.
In specific implementation process, please refer to Fig. 6, step S22 comprises following sub-step:
In S221, the process that vacuumizes when primary Ioops, control described second valve 304 and be in opening, and described first valve 303, described 3rd valve 305 and described 4th valve 306 keep closed condition, to make described main pump shaft seal balance pipe 10 to header tank 20 draining, and monitored the water level of described header tank 20 by liquid level gauge 50;
S222, when described liquid level gauge 50 monitor the water level obtaining described header tank 20 reach preset water level time, vacuumize incessantly in situation at primary Ioops, close described second valve 304, and control to open described 3rd valve 305 and described 4th valve 306, to carry out draining to described header tank 20;
S223, after the draining of described header tank 20 completes, close described 3rd valve 305 and described 4th valve 306, and slowly open described second valve 304, again be communicated with described header tank 20 to make described main pump shaft seal balance pipe 10, to prevent described main pump shaft seal balance pipe 10 from water seal phenomenon occurring, and then described main pump shaft seal 100 is made to be in pressure balance.
In specific implementation process, the water that balance pipe 10 enters header tank 20 is not arrange outward in real time, header tank 20 has certain capacity, in the process of balance pipe 10 to header tank 20 draining, by the water level in liquid level gauge 50 Real-Time Monitoring header tank 20, when this water level reaches header tank 20 limit value (being about to affect pressure balanced water level critical point in balance pipe 10), connecting pipe (i.e. the first pipeline 401) between balance pipe 10 and header tank 20 is blocked, to ensure that the vacuum environment in balance pipe 10 and primary Ioops is not destroyed, open the 3rd valve 305 and the 4th valve 306 simultaneously, draining is carried out to header tank 20.After header tank 20 draining is complete, the 3rd valve 305 on closure set water tank 20 and the 4th valve 306, and connected set water tank 20 and balance pipe 10 again, because the pressure in now header tank 20 is atmospheric pressure, be vacuum in shaft seal balance pipe 10, in order to balance the pressure change in shaft seal balance pipe 10 and header tank 20, the second valve 304 must slowly be opened, prevent that pressure transient causes device damage, and the vacuum in destruction of balance pipe.It is pointed out that header tank 20 and balance pipe 10 block and draining, complete and be again communicated with during this period of time with balance pipe 10 to header tank 20 draining, the ponding in balance pipe 10 is unlikely to destroy main pump shaft seal 100 pressure at both sides and balances.
Further, second pair of vacant duct 403 to arranging above header tank 20 is needed to be described with the principle of work of the 3rd valve 305: when primary Ioops vacuumizes and balance pipe 10 is communicated with header tank 20, close the 3rd valve 305 and the 4th valve 306, to ensure the inner vacuum environment of header tank 20 and balance pipe 10, and guarantee that header tank 20 can not leak gas in the process vacuumized; And then, water level in header tank 20 is too high, and punctuated equilibrium pipe 10 and header tank 20, and when draining is carried out to header tank 20, the pressure of header tank 20 inside 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 header tank 20 top communicate with atmospheric environment, contributes to the smooth discharge of ponding in header tank 20.
In like manner for pair vacant duct of first on short tube 103 402 and the first valve 303 to arrange purposes similar, namely step S1 is performed: when pipeline draining being carried out to main pump shaft seal balance pipe 10 before primary Ioops vacuumizes, open the first valve 303, contributing to that main pump shaft seal balance pipe 10 is smooth and easy must to header tank 20 draining, simultaneously, open the 3rd valve 305 on header tank 20, contribute to that water in header tank 20 is smooth and easy must be discharged by second pipe 404.Certainly, must guarantee that in the process that primary Ioops vacuumizes the first valve 303 is in closed condition, prevent vacuum to be destroyed.
It is to be noted, in the process that primary Ioops vacuumizes, time sub-step S221 ~ S223 of execution so repeatedly, can realize under vacuum pumping incessantly situation, complete the draining to main pump shaft seal balance pipe 10, to maintain main pump shaft seal 100 pressure at both sides balance.
In a word, by implementing the present invention program, avoid the time-out vacuum pumping caused because main pump shaft seal pressure reduction is too low in RCP system vacuum, and avoid the operation (i.e. an operation at most consuming time except vacuumizing itself in vacuum) that dismounting shaft seal balance pipe carries out draining, achieve the technique effect on average can saving at least 1.5 hours pumpdown times.Further, main pump shaft seal pressure balance device in the present invention program is in whole vacuum, main pump shaft can be maintained incessantly and seal up downstream pressure balance, upper due to what do not need main pump shaft seal in the process vacuumized, the formal valve in downstream operates, avoid the risk that main pump shaft seal pressure reduction transient fluctuation that axial seal pressure balance device in the past causes because of valve operation mistake during draining is brought, it also avoid the impact on the registration of differential pressure indicator in the formal circuit of main pump shaft seal, ensure that the reliability that shaft seal pressure reduction monitors in whole process, truly achieve RCP main pump shaft seal pressure reduction monitor and pressure reduction limit value protection with primary Ioops vacuum pumping complete independently, the effect be independent of each other.
According to description above, above-mentioned nuclear power station main pump axial seal pressure balance control method is applied in above-mentioned nuclear power station main pump axial seal pressure balance control device, so the implementation process of the method is consistent with one or more embodiments of said apparatus, just repeat no longer one by one at this.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (11)
1. a nuclear power station main pump axial seal pressure balance device, is characterized in that, described pressure equaliser comprises:
For the main pump shaft seal balance pipe (10) of the upstream flow in pipes and downstream leak conduit that are communicated with main pump shaft seal (100);
Be arranged on described main pump shaft seal balance pipe (10) below, be communicated with described main pump shaft seal balance pipe (10), for the header tank (20) to the online draining of described main pump shaft seal balance pipe (10);
Be connected with described main pump shaft seal balance pipe (10) and described header tank (20), for in (10) draining of described main pump shaft seal balance pipe and the process that vacuumizes primary Ioops, control the water discharge of described main pump shaft seal balance pipe (10) and described header tank (20), with the valve member (30) making described main pump shaft seal (100) be in pressure balance.
2. main pump shaft seal pressure balance device as claimed in claim 1, it is characterized in that, the U-shaped layout of described main pump shaft seal balance pipe (10), described main pump shaft seal balance pipe (10) comprising:
For being communicated with the first balance pipeline section (101) of main pump shaft seal (100) upstream flow in pipes;
For being communicated with the second balance pipeline section (102) of main pump shaft seal (100) downstream leak conduit;
Be arranged on the bottom of described U-shaped layout, for being communicated with the short tube (103) of described first balance pipeline section (101), described second balance pipeline section (102) and described header tank (20).
3. main pump shaft seal pressure balance device as claimed in claim 2, it is characterized in that, described pressure equaliser also comprises:
For being communicated with first pipeline (401) of described short tube (103) and described header tank (20);
Be arranged on described short tube (103) top, for being communicated with first pair of vacant duct (402) of described short tube (103) and outside atmosphere;
Be arranged on described header tank (20) top, for being communicated with second pair of vacant duct (403) of described header tank (20) and outside atmosphere;
Be arranged on described header tank (20) below, for discharging the second pipe (404) of ponding in described header tank (20).
4. main pump shaft seal pressure balance device as claimed in claim 3, it is characterized in that, described valve member (30) comprising:
Being arranged in described first balance pipeline section (101), balancing the formal valve in the upstream be communicated with (301) of pipeline section (101) for controlling described upstream flow in pipes and described first;
Be arranged in described second balance pipeline section (102), for controlling the formal valve in the downstream be communicated with (302) of described second balance pipeline section (102) and described downstream leak conduit;
Be arranged on described first pair of vacant duct (402), for controlling first valve (303) be communicated with of described short tube (103) and outside atmosphere;
Be arranged on described first pipeline (401), for controlling second valve (304) be communicated with of described main pump shaft seal balance pipe (10) and described header tank (20);
Be arranged on described second pair of vacant duct (403), for controlling the 3rd valve (305) be communicated with of described header tank (20) and outside atmosphere;
Be arranged on described second pipe (404), for controlling the 4th valve (306) of the water discharge of described header tank (20).
5. main pump shaft seal pressure balance device as claimed in claim 1, it is characterized in that, described pressure equaliser also comprises:
Be arranged on described header tank (20), for monitoring the liquid level gauge (50) of the water level of described header tank (20).
6. the main pump shaft seal pressure balance device as described in claim as arbitrary in claim 2 ~ 5, it is characterized in that, described first balance pipeline section (101) and described second balance pipeline section (102) all adopt high pressure steel lining hose, and described high pressure steel bushing pipe can bear the absolute vacuum pressure of at least 170 hundred handkerchiefs.
7. main pump shaft seal pressure balance device as claimed in claim 1, it is characterized in that, in described valve member (30), all valves all can normally be opened or close under the absolute vacuum pressure of minimum 17,000 handkerchiefs.
8. a nuclear power station main pump axial seal pressure balance control method, be applied in nuclear power station main pump axial seal pressure balance device, it is characterized in that, described control method for pressure balance comprises step:
S1, when main pump shaft seal (100) upstream inject cut off after, by main pump shaft seal balance pipe (10) and header tank (20), pipeline draining is carried out to main pump shaft seal (100);
S2, after the flow in pipes draining of described upstream completes, and in the process that vacuumizes of primary Ioops, described main pump shaft seal balance pipe (10) is controlled to described header tank (20) draining by valve member (30), to prevent described main pump shaft seal balance pipe (10) from when primary Ioops vacuumizes, water seal phenomenon occurring, and then described main pump shaft seal (100) is made to be in pressure balance.
9. main pump shaft seal pressure balance control method as claimed in claim 8, it is characterized in that, described step S1 is specially:
After cut-out is injected in main pump shaft seal (100) upstream, open the formal valve in upstream (301), the first valve (303), the second valve (304), the 3rd valve (305) and the 4th valve (306), to carry out pipeline draining by main pump shaft seal balance pipe (10) and header tank (20) to main pump shaft seal (100).
10. main pump shaft seal pressure balance control method as claimed in claim 9, it is characterized in that, described step S2 specifically comprises:
S21, after the flow in pipes draining of described upstream completes, close the formal valve in described upstream (301), described first valve (303), described second valve (304), described 3rd valve (305) and described 4th valve (306);
In S22, the process that vacuumizes when primary Ioops, control described second valve (304) and be in opening, and described first valve (303), described 3rd valve (305) and described 4th valve (306) keep closed condition, to make described main pump shaft seal balance pipe (10) to described header tank (20) draining, and prevent described main pump shaft seal balance pipe (10) from water seal phenomenon occurring, and then described main pump shaft seal (100) is made to be in pressure balance.
11. main pump shaft seal pressure balance control methods as claimed in claim 10, it is characterized in that, described step S22 specifically comprises:
In S221, the process that vacuumizes when primary Ioops, control described second valve (304) and be in opening, and described first valve (303), described 3rd valve (305) and described 4th valve (306) keep closed condition, to make described main pump shaft seal balance pipe (10) to header tank (20) draining, and monitored the water level of described header tank (20) by liquid level gauge (50);
S222, when described liquid level gauge (50) monitoring obtain described header tank (20) water level reach preset water level time, vacuumize incessantly in situation at primary Ioops, close described second valve (304), and control to open described 3rd valve (305) and described 4th valve (306), to carry out draining to described header tank (20);
S223, after described header tank (20) draining completes, close described 3rd valve (305) and described 4th valve (306), and slowly open described second valve (304), again be communicated with described header tank (20) to make described main pump shaft seal balance pipe (10), to prevent described main pump shaft seal balance pipe (10) from water seal phenomenon occurring, and then described main pump shaft seal (100) is made to be in pressure balance.
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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 true CN104733059A (en) | 2015-06-24 |
| CN104733059B CN104733059B (en) | 2017-10-31 |
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| CN201510144555.8A Active 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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Cited By (1)
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| CN112191287A (en) * | 2020-09-30 | 2021-01-08 | 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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| CN104733059B (en) | 2017-10-31 |
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