CN103511320A - Pressure stabilizing system of cooling lubrication loop of main pump radial thrust bearing - Google Patents
Pressure stabilizing system of cooling lubrication loop of main pump radial thrust bearing Download PDFInfo
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- CN103511320A CN103511320A CN201210219052.9A CN201210219052A CN103511320A CN 103511320 A CN103511320 A CN 103511320A CN 201210219052 A CN201210219052 A CN 201210219052A CN 103511320 A CN103511320 A CN 103511320A
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- valve
- pipeline
- main pump
- surge tank
- thrust bearing
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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 relates to a pressure stabilizing system of a cooling lubrication loop of a main pump radial thrust bearing. The pressure stabilizing system comprises a nitrogen supply system, a demineralized water supply system, a pressure stabilizing tank connected with the nitrogen supply system, a pressure stabilizing tank connected-in valve connected with the pressure stabilizing tank, a demineralized water supply pump connected with the demineralized water supply system, a throttling element connected with the demineralized water supply pump, a check valve which is connected with the throttling piece and the pressure stabilizing tank connected-in valve respectively, a head tank which is connected with the check valve and the pressure stabilizing tank connected-in valve respectively, and a head tank overflow valve connected with the top of the head tank. The cooling lubrication loop of the main pump radial thrust bearing is connected with the bottom of the head tank. According to the pressure stabilizing system of the cooling lubrication loop of the main pump radial thrust bearing, special tests are used for testing, under the working condition that the demineralized water supply system replenishes water to a nuclear island equipment cooling water head tank and a condenser in a large flow mode, the pressure stabilizing tank has certain stress-buffering capacity to the system, the influence of the demineralized water supply system on pressure fluctuation can be removed, and the system is stable in working.
Description
Technical field
The present invention relates to the voltage-stabilizing system in a kind of main pump radial-thrust bearing cooling and lubricating loop, particularly relate to a kind of wearing and tearing of cavitation to main pump radial-thrust bearing bearing shell of having avoided, guaranteed the voltage-stabilizing system in the main pump radial-thrust bearing cooling and lubricating loop of the feasibility that unit substantial equipment safety, nuclear safety and enforcement long period reload.
Background technique
Nuclear power station main pump is the visual plant of reactor-loop system, by main pump, drives reactor coolant pump circulation to derive reactor core heat release.Top design at main pump has flywheel, when main pump runs out of steam power supply, by flywheel, drives the running down of main pump hydraulic parts, and by enough coasting time, what guarantee reactor core heat release takes and set up stable natural circulation flow out of, guarantees the finally cooling of reactor core.Therefore the coasting time of main pump is extremely important.For guaranteeing that the thrust bearing of main pump rotatable parts axially locating and carrying goes wrong, may cause coasting time deficiency and axis accident, when serious, may cause reactor core to damage.
The lubricated general of main pump radial-thrust bearing adopts oil lubrication, but adopts the main pump of oil lubrication to bring very large problem to fire prevention, so countries in the world are tended to research and adopted water to be lubricated.Nuclear power station 1391 type main pump designs in Russia Tian gulf have adopted the scheme of water lubrication, and this is that Russia adopts first in VVER-1000 heap type, to large commercial heap, is also to use first in the world.Certain demonstration test has been done to main pump radial-thrust bearing water lubrication design by Russia, but the time of test still inadequate ，Tian gulf nuclear power station main pump water lubricating thrust bearing possessing can think prototype.Follow-up operation facts have proved: prototype exists geneogenous deficiency, has not only affected the normal production in power station, even can threaten the safety of unit.From debugging so far, repeatedly there is the related defects in main pump radial-thrust bearing loop in gulf, field nuclear power station:
When No. 1 unit of 9 Tian gulf nuclear power station February in 2006 recovers No. 3 main pump operations after carrying out natural circulation test, main pump starts unsuccessfully, causes main pump motor to burn.Immediate cause is that the damage of main pump thrust bearing bearing shell causes due to motor rotation blockage.Directly cause: 880,000 dollars of direct loss, the loss of 50 days light maintenance durations, limber up period is further delayed.
Follow-up, carried out the relevant transformations such as a series of main pump entities, protection, supervision.Yet problem does not finish ...
Radial-thrust bearing is follow-up there are a series of dependent events:
No. 2 main pump coasting time anomalous event reasons of No. 1 unit on June 12nd, 2006 are similarly due to the damage of main pump thrust bearing bearing shell;
Width panel breakage on No. 1 main pump thrust bearing of No. 1 unit on March 5th, 2008;
No. 4 main pump heat release rates of unit on September 2nd, 2009 surpass 5% and shut down light maintenance, 202 hours durations;
It is defective that on October 31st, 2009, No. 1 unit main transformer A protected 2, No. 3 higher main pump coasting time of heat release rate during shutdown mutually;
No. 1 main pump heat release rate of unit on April 2nd, 2010 surpasses 5% and shuts down light maintenance, 149 hours durations;
No. 3, No. 4 main pump heat release rates of unit on December 2nd, 2010 surpass 5%, shut down light maintenance, 293 hours durations.
The problem that main pump radial-thrust bearing exists has had a strong impact on Security and the economic benefit of unit, even if cause unit to implement 18 months long periods, reloads, and centre also can be because main pump radial-thrust bearing defect causes light maintenance, and the unit capacity factor is difficult to improve.
Therefore need the voltage-stabilizing system that a kind of novel main pump radial-thrust bearing cooling and lubricating loop is provided badly.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of wearing and tearing of cavitation to main pump radial-thrust bearing bearing shell of having avoided, and has guaranteed the voltage-stabilizing system in the main pump radial-thrust bearing cooling and lubricating loop of the feasibility that unit substantial equipment safety, nuclear safety and enforcement long period reload.
For solving the problems of the technologies described above, the voltage-stabilizing system in a kind of main pump radial-thrust bearing cooling and lubricating of the present invention loop, comprises a case relief valve of nitrogen supply (NS) system, demineralized water supply system, the surge tank being connected with nitrogen supply (NS) system, the surge tank cut-in valve being connected with surge tank bottom, the demineralized water supply pump being connected with demineralized water supply system, the throttling element being connected with demineralized water supply pump, the check valve being connected with surge tank cut-in valve with throttling element respectively, the case being connected with surge tank cut-in valve with check valve respectively and the connection of Yu Tou box top; Main pump radial-thrust bearing cooling and lubricating loop is connected with a case bottom.
Surge tank bottom is provided with exhaust line that hydrophobic pipeline, hydrophobic pipeline are provided with balance pipeline, the balance pipeline the other end is connected with is respectively communicated with atmosphere and the top of the nitrogen supply (NS) pipeline being connected with nitrogen supply (NS) system, surge tank is provided with the air intake-exhaust pipeline being connected with balance pipeline; Hydrophobic pipeline between hydrophobic pipeline outlet and balance pipeline is provided with drain valve; Balance pipeline between air intake-exhaust pipeline and hydrophobic pipeline is provided with equilibrium valve; Nitrogen supply (NS) pipeline is provided with the first separating valve and the second separating valve; Exhaust line is provided with first row gas separating valve and second row gas separating valve.
Surge tank total capacity is 100L, and Maximum operating pressure is 0.65MPa, and Maximum operating temperature is 80 ℃.
The present invention tests by dedicated experiments, in demineralized water supply system under nuclear island apparatus cools head case and the large flow moisturizing of vapour condenser operating mode, the pressure buffer ability of surge tank to system.Demineralized water supply system abrupt pressure reduction (seeing Fig. 3) now, and surge tank pressure and liquid level (seeing Fig. 4,5) slow decreasing, main pump radial-thrust bearing chamber pressure (see figure 6) is slow decreasing also.Fig. 3,4,5,6 shows that newly-increased loop of voltage regulation meets design function, possesses certain pressure buffer ability, can overcome the impact of demineralized water supply system pressure surge, and system works is stable.
Accompanying drawing explanation
Fig. 1 is the voltage-stabilizing system schematic diagram in a kind of main pump radial-thrust bearing cooling and lubricating provided by the present invention loop.
Fig. 2 be in the voltage-stabilizing system in a kind of main pump radial-thrust bearing cooling and lubricating provided by the present invention loop surge tank around pipeline arrange schematic diagram.
Fig. 3 is that demineralized water supply system pressure changes schematic diagram.
Fig. 4 is that surge tank pressure changes schematic diagram.
Fig. 5 is that surge tank liquid level changes schematic diagram.
Fig. 6 is that main pump radial-thrust bearing chamber pressure changes schematic diagram.
In figure: 1 is demineralized water supply system, 2 is demineralized water supply pump, and 3 is throttling element, 4 is check valve, and 5 is a case, and 6 is surge tank, 7 is nitrogen supply (NS) system, and 8 is check valve by-pass valve, and 9 is surge tank cut-in valve, 10 is a case relief valve, and 11 is drain valve, and 12 is equilibrium valve, 13 is first row gas separating valve, and 14 is second row gas separating valve, and 15 is the first separating valve, 16 is the second separating valve, and 17 is air intake-exhaust pipeline.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further detailed explanation.
The present invention includes nitrogen supply (NS) system 7, demineralized water supply system 1, surge tank 6, surge tank cut-in valve 9, demineralized water supply pump 2, throttling element 3, check valve 4, a case 5, check valve by-pass valve 8, and a case relief valve 10.
The parameters of demineralized water supply pump 2 is in Table one
Table one
Throttling element 3 parameters are in Table two
Table two
Table three
Table four
Table five
The first separating valve 15 and the second separating valve 16 parameters are in Table six;
Table six
Check valve by-pass valve 8, surge tank cut-in valve 9, case relief valve 10 parameters are in Table six;
Table six
Table seven
Under nominal operating condition, surge tank 6 is by a certain amount of nitrogen of nitrogen supply (NS) system 7 supply, main pump head case relief valve 10 cuts out, surge tank cut-in valve 9 is opened, demineralized water supply pump 2 is from 1 water intaking of demineralized water supply system, arrive throttling element 3 voltage stabilizing throttlings after pump 2 boosts after, by check valve 4, feed main pump head case 5, after main pump head case 5, demineralized water feeds main pump radial-thrust bearing.When the user of demineralized water supply pump 2 changes and while causing that system pressure changes, by the expansion of surge tank 6 interior nitrogen, the pressure surge that compression carrys out relieving system.
After demineralized water supply pump 2 faults are stopped transport, under the pressure of setting up at the interior nitrogen of surge tank 6, check valve 4 is closed, and avoids causing system pressure to decline because the demineralized water in main pump head case 5 flows backwards.Under the pressure of now setting up at the interior nitrogen of surge tank 6, the water of dependence surge tank 6 interior storages can guarantee the supply in short-term of main pump head case 5 interior demineralized waters, demineralized water liquid level in surge tank 6 is during lower than lower limit value, according to instrument control signal surge tank cut-in valve 9, automatically close, thereby prevent that the nitrogen in surge tank 6 from entering main pump head case 5, and then enter main pump radial-thrust bearing, cause that main pump radial-thrust bearing heat conduction condition worsens.
When system water-filling first, first by opening surge tank cut-in valve 9, demineralized water is incorporated in surge tank 6, now drain valve 11, equilibrium valve 12, the first separating valve 15 and the second separating valve 16 are all closed, first row gas separating valve 13 and second row gas separating valve 14 are opened, along with the interior water level of surge tank 6 rises, the interior air of surge tank 6 is by air intake-exhaust pipeline 17 and the first row gas separating valve 13 of opening and 14 discharges of second row gas separating valve.After water is expired in surge tank 6, close surge tank cut-in valve 9 and first, second exhaust separating valve 13,14.Then open drain valve 11 and in surge tank 6, be filled with nitrogen on one side with first, second separating valve 15,16 drainings on one side, when surge tank 6 drain valves 11 are closed in surge tank 6 drainings during to water tank one half volume, continuation is to surge tank 6 inflated with nitrogen, when pressure arrival is consistent with the normal operating pressure of demineralized water supply system 1, close the second separating valve 16, now opening equilibrium valve 12 introduces water in the first separating valve 15 pipelines of surge tank 6 bottoms, to set up sealing water column again.After sealing water column is set up, close again the first separating valve 15 and just can seal, isolate nitrogen for water like this, thereby prevent that nitrogen is leaked to outside system by the valve being connected with surge tank 6.
Adopt the present invention to test, find that main pump Operational Limits has had large optimization immediately: main pump radial-thrust bearing bearing shell heat release rate becomes-18% from-3.5%, radial-thrust bearing pressure is raised to 1.317MPa by 0.988MPa, and radial-thrust bearing cooling circuit outlet temperature is reduced to 58 degree by 61 degree.And verified that demineralized water supply system 1 is under a case 5 and condenser water replenishing operating mode, and newly-increased loop of voltage regulation meets design function, can overcome the impact of demineralized water supply system 1 pressure surge, and system works is stable.Transformation and the main pump radial-thrust bearing bearing bush abrasion situation that there is no transformation were done in contrast loop, and the former will obviously be better than the latter by bearing shell state.
Claims (3)
1. the voltage-stabilizing system in a main pump radial-thrust bearing cooling and lubricating loop, it is characterized in that: comprise nitrogen supply (NS) system, demineralized water supply system, the surge tank being connected with described nitrogen supply (NS) system, the surge tank cut-in valve being connected with described surge tank bottom, the demineralized water supply pump being connected with described demineralized water supply system, the throttling element being connected with described demineralized water supply pump, the check valve being connected with surge tank cut-in valve with described throttling element respectively, the case being connected with surge tank cut-in valve with described check valve respectively, and the case relief valve being connected with described box top, described main pump radial-thrust bearing cooling and lubricating loop is connected with described case bottom.
2. the voltage-stabilizing system in a kind of main pump radial-thrust bearing cooling and lubricating according to claim 1 loop, is characterized in that: described surge tank bottom is provided with hydrophobic pipeline, described hydrophobic pipeline is provided with balance pipeline, the described balance pipeline the other end is connected with to be respectively communicated with atmosphere exhaust line and the top of the nitrogen supply (NS) pipeline being connected with nitrogen supply (NS) system, described surge tank and is provided with the air intake-exhaust pipeline being connected with described balance pipeline; Hydrophobic pipeline between described hydrophobic pipeline outlet and balance pipeline is provided with drain valve; Balance pipeline between described air intake-exhaust pipeline and described hydrophobic pipeline is provided with equilibrium valve; Described nitrogen supply (NS) pipeline is provided with the first separating valve and the second separating valve; Described exhaust line is provided with first row gas separating valve and second row gas separating valve.
3. the voltage-stabilizing system in a kind of main pump radial-thrust bearing cooling and lubricating according to claim 1 loop, is characterized in that: described surge tank total capacity is 100L, and Maximum operating pressure is 0.65MPa, and Maximum operating temperature is 80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210219052.9A CN103511320B (en) | 2012-06-28 | 2012-06-28 | A kind of voltage-stabilizing system of main pump radial-thrust bearing cooling and lubricating loop |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210219052.9A CN103511320B (en) | 2012-06-28 | 2012-06-28 | A kind of voltage-stabilizing system of main pump radial-thrust bearing cooling and lubricating loop |
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| CN103511320A true CN103511320A (en) | 2014-01-15 |
| CN103511320B CN103511320B (en) | 2016-01-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2578738C1 (en) * | 2014-10-15 | 2016-03-27 | Цзянсуская корпорация по ядерной энергетике | Hydraulic lock device for protection against ingress of nitrogen in radial-axial bearing of main circulation pump |
| RU2578767C1 (en) * | 2014-10-15 | 2016-03-27 | Цзянсуская корпорация по ядерной энергетике | Pressure stabilization system of channel for cooling and lubricating radial-axial bearing of main circulation pump |
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| US6655932B1 (en) * | 1999-06-01 | 2003-12-02 | Kvaerner Eureka As | Pressure impacted cooling and lubrication unit |
| CN101079333A (en) * | 2006-05-26 | 2007-11-28 | 中国核动力研究设计院 | Nuclear reactor non-energy and multi-function pool voltage-stabling system |
| CN201111966Y (en) * | 2007-09-30 | 2008-09-10 | 中国原子能科学研究院 | Water cooling system of sodium-cooled fast reactor sodium circulating pump |
| JP2009144563A (en) * | 2007-12-12 | 2009-07-02 | Torishima Pump Mfg Co Ltd | Non-water-injection bearing device for horizontal shaft pump |
| CN102022384A (en) * | 2010-12-09 | 2011-04-20 | 江苏大学 | Hard alloy sliding bearing water-diversion cooling and lubrication system of mine submersible pump |
| CN202732441U (en) * | 2012-06-28 | 2013-02-13 | 江苏核电有限公司 | Pressure stabilizing system for main pump radial thrust bearing cooling and lubricating circuit |
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2012
- 2012-06-28 CN CN201210219052.9A patent/CN103511320B/en active Active
Patent Citations (6)
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| US6655932B1 (en) * | 1999-06-01 | 2003-12-02 | Kvaerner Eureka As | Pressure impacted cooling and lubrication unit |
| CN101079333A (en) * | 2006-05-26 | 2007-11-28 | 中国核动力研究设计院 | Nuclear reactor non-energy and multi-function pool voltage-stabling system |
| CN201111966Y (en) * | 2007-09-30 | 2008-09-10 | 中国原子能科学研究院 | Water cooling system of sodium-cooled fast reactor sodium circulating pump |
| JP2009144563A (en) * | 2007-12-12 | 2009-07-02 | Torishima Pump Mfg Co Ltd | Non-water-injection bearing device for horizontal shaft pump |
| CN102022384A (en) * | 2010-12-09 | 2011-04-20 | 江苏大学 | Hard alloy sliding bearing water-diversion cooling and lubrication system of mine submersible pump |
| CN202732441U (en) * | 2012-06-28 | 2013-02-13 | 江苏核电有限公司 | Pressure stabilizing system for main pump radial thrust bearing cooling and lubricating circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2578738C1 (en) * | 2014-10-15 | 2016-03-27 | Цзянсуская корпорация по ядерной энергетике | Hydraulic lock device for protection against ingress of nitrogen in radial-axial bearing of main circulation pump |
| RU2578767C1 (en) * | 2014-10-15 | 2016-03-27 | Цзянсуская корпорация по ядерной энергетике | Pressure stabilization system of channel for cooling and lubricating radial-axial bearing of main circulation pump |
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| Publication number | Publication date |
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| CN103511320B (en) | 2016-01-27 |
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