CN103489491A - Device for changing ground pit fragment transmission - Google Patents
Device for changing ground pit fragment transmission Download PDFInfo
- Publication number
- CN103489491A CN103489491A CN201210191943.8A CN201210191943A CN103489491A CN 103489491 A CN103489491 A CN 103489491A CN 201210191943 A CN201210191943 A CN 201210191943A CN 103489491 A CN103489491 A CN 103489491A
- Authority
- CN
- China
- Prior art keywords
- melt pit
- blocking apparatus
- fragment transmission
- change
- ground pit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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 device for changing ground pit fragment transmission, and the device is used in a ground pit of a nuclear power plant, wherein the ground pit is provided with a ground pit filter. The device for changing ground pit fragment transmission comprises a plurality of interceptors fixedly arranged in the ground pit and changing water flow strength and direction in the ground pit. Through arrangement of the interceptors, distribution of flow field and turbulence turbulent kinetic energy field of a fluid in the ground pit can be changed so as to reduce the amount of fragments flowing to the ground pit filter and ensure that a nuclear power safe spray system and a safe injection system (EAS/RIS) have enough cavitation residual amount and a spray pump and a safe injection pump can regularly work, and the device has the advantages of simple structure and low cost, and can improve operational safety of the nuclear power plant.
Description
Technical field
The present invention relates to nuclear power plant equipment, more particularly, relate to a kind of device that changes the transmission of melt pit fragment.
Background technology
Along with improving constantly of the security of the ripe nuclear power station of technology, the construction of the nuclear power station important energy source guarantee that becomes national development gradually.
Melt pit is set in the nuclear reactor in current nuclear power station usually, by melt pit, stores chilled water, supply with safety injection pump and the spray pump of nuclear safety emergency system, in order to the cooled reactor containment, prevent to pile molten accident.Under the occasion of accident conditions or the generation of other fragments, after fragment produces, can flow in the melt pit of nuclear reactor with current.
Fragment can be along with current flowing in melt pit; and some can be transferred on sump filter; (effect of sump filter is to filter fragment; prevent that fragment from entering safety injection pump and spray pump; protection pump and upstream device); when the fragment accumulation on the melt pit filtrator increases; the loss in head that fragment causes also can increase thereupon; can cause safety injection pump and spray pump generation cavitation when serious; now containment vessel will can not get fully cooling; the molten accident of heap likely occurs, and causes leaking of core radiating matter.
In current nuclear power station melt pit, also do not have reliable device to change the amount of debris that is transferred to sump filter, make the nuclear power station operation have risk.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of device that can effectively reduce the change melt pit fragment transmission of the amount of debris be transferred on sump filter is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of device that changes the transmission of melt pit fragment, for the nuclear power station melt pit, described melt pit is provided with sump filter, and the device of this change melt pit fragment transmission comprises and somely is fixedly installed in described melt pit, changes stream competence in described melt pit and the blocking apparatus of direction.
In the device of change melt pit fragment transmission of the present invention, described blocking apparatus is fixedly installed on the ground of described melt pit by retention mechanism.
In the device of change melt pit fragment transmission of the present invention, described retention mechanism is foot bolt and/or the concrete of fixing described blocking apparatus.
In the device of change melt pit fragment transmission of the present invention, described blocking apparatus is rectangular parallelepiped interception wall.
In the device of change melt pit fragment transmission of the present invention, the height of described interception wall is 0.3-0.9 rice, and length is 0.6-2.4 rice, and width is 0.1 meter-0.5 meter.
In the device of change melt pit fragment transmission of the present invention, the surrounding of described blocking apparatus is provided with water flow space.
Device in change melt pit fragment transmission of the present invention is characterized in that the surrounding of described blocking apparatus is provided with water flow space.
In the device of change melt pit fragment transmission of the present invention, the larger xsect of described blocking apparatus is perpendicular to water (flow) direction.
In the device of change melt pit fragment transmission of the present invention, described melt pit locates below ground level, and its top floor is provided with for current and washes away the passway flowed down; And, the zone, ring corridor that described melt pit comprises central area and described sump filter is installed; Be provided with the connected entrance for the current circulation between described central area and zone, described ring corridor.
In the device of change melt pit fragment transmission of the present invention, described blocking apparatus, according to the position of described sump filter, is arranged in described central area and the position corresponding with described connected entrance.
In the device of change melt pit fragment transmission of the present invention, described blocking apparatus is arranged on main described connected entrance position; And, half that the height of described blocking apparatus is fluid level, the length of described blocking apparatus is identical with the gap of described connected entrance.
Implement the present invention and there is following beneficial effect: by blocking apparatus is set, change the flow field of melt pit inner fluid, the distribution of turbulence kinetic energy, flow to the amount of debris on sump filter thereby reduce, guarantee that Nuclear Safety spray system and safety injection system (EAS/RIS) have enough net positive suction heads, guarantee the normal operation of spray pump and safety injection pump, have advantages of simple in structure, cost is low, improve the nuclear power station operation safety.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram that the present invention changes the device of melt pit fragment transmission;
Fig. 2 is the schematic top plan view of application of installation in melt pit that the present invention changes the transmission of melt pit fragment;
Fig. 3 a is the velocity profile in the melt pit before blocking apparatus is installed;
Fig. 3 b is the velocity profile in the melt pit after blocking apparatus is installed;
Fig. 4 a is the tubulence energy distribution plan in the melt pit before blocking apparatus is installed;
Fig. 4 b is the tubulence energy distribution plan in the melt pit after blocking apparatus is installed.
Embodiment
As shown in Figure 1, 2, be an embodiment of the device of change melt pit fragment transmission of the present invention, can be used in nuclear power station melt pit 10.
This nuclear power station melt pit 10 locates below ground level, and is usually directed to as bottom surface below 3.5 meters, and certainly, the degree of depth can be designed as required, and the top of melt pit 10 is 0 meter floor.The water of melt pit is to wash away from the passway 11 of floor mostly.11 position, this passway is arranged on the top floor of melt pit 10 according to actual conditions.
In the present embodiment, this melt pit 10 comprises zone, 14He Huan corridor, central area 13.This central area 14 is for arranging and install various nuclear power apparatus equipment, and ring zone, corridor 13 is for arranging the sump filter (not shown).Be provided with the connected entrance 15 for the current circulation between zone, 14He Huan corridor, central area 13, and the bottom in ring zone, corridor 13 is provided with Pump Suction Nozzle 12, it is the outlet of melt pit 10 current, by this Pump Suction Nozzle 12, current are delivered to spray pump and safety injection pump, carry out the cooling of reactor, its water (flow) direction is as shown in Fig. 2 arrow.
The factor that affects chip distribution is: fluid velocity, Hydrodynamic turbulence energy and chip size size, because fragment is fixed, when changing chip distribution, the present embodiment can be started with from fluid velocity and Hydrodynamic turbulence.
Fluid velocity is mainly that fluid can roll and mobile fragment when fluid velocity is enough large on the impact of chip distribution, thereby drives the fragment transmission; Hydrodynamic turbulence can be on the impact of chip distribution, and when tubulence energy is enough large, mobile fluid has enough buoyancy is suspended in fluid fragment, and the fragment of these suspensions can transmit, distribute along the flow direction of fluid.
Flow velocity and tubulence energy (TKE) are very large on the impact of chip distribution and transmission share.Wherein, being described below of tubulence energy (TKE):
According to the fragment settling velocity, calculate the minimum tubulence energy that fragment suspends and needs, it is defined as,
In formula, u
ifor the fluctuation item (vector) of speed, (m/s); u
iu
ifor the dot product of velocity perturbation item, (m
2/ s
2), by speed u
idecompose xyz three dimensions u
x, u
y, u
z, can obtain thus,
In formula, u
xand u
yfor the speed component of horizontal direction, (m/s); u
zfor the speed component of vertical direction, (m/s).At this, think the three-dimensional speed component u of xyz
x, u
yand u
zequate respectively.
After having understood the impact on chip distribution of fluid velocity and tubulence energy, velocity field and turbulence kinetic energy to the melt pit inner fluid are carried out analytical calculation, obtain the distribution of melt pit fluid velocity inside field and turbulence kinetic energy, then according to the distribution results of velocity field and turbulence kinetic energy, arrange blocking apparatus, thereby effectively change the distribution of fluid velocity field and turbulence kinetic energy, finally change transmission and the distribution of melt pit internal fragment.(physical dimension of blocking apparatus and position have a significant impact the distribution that changes fluid velocity field and turbulence kinetic energy, and physical dimension and position to blocking apparatus in calculating carry out optimized design)
In the present embodiment, the device that changes the transmission of melt pit fragment comprises some blocking apparatus 20, and this blocking apparatus 20 is fixedly installed in melt pit 10 by retention mechanism, changes stream competence and direction in melt pit 10.This retention mechanism can be fixedly mounted on blocking apparatus 20 on the ground of melt pit 10 mechanically for foot bolt and/or concrete etc., can resist water impact.
As shown in Figure 1, this blocking apparatus 20 can adopt the solid entity structure, and for example concrete walls, be fixedly installed on melt pit 10 ground by retention mechanism.This blocking apparatus 20 can be according to melt pit 10 water velocities and upstream fragment mass distribution, and height H is set in 0.3 meter-0.9 meter and is advisable, and length L is set 0.6 meter-2.4 meters and is advisable, and width D is set 0.1 meter-0.5 meter and is advisable.
According to the distribution of current flow field and turbulence kinetic energy in melt pit 10, can blocking apparatus 20 be installed at key position, as shown in Figure 2, some blocking apparatus 20 distribute in zone, ring corridor 13, the 14Deng position, central area of melt pit 10.Understandable, this blocking apparatus can be arranged on the position of flow velocity and the tubulence energy that can effectively reduce fluid in melt pit most, so it is usually located at fluid and leads on the main runner of filtrator, and arranged direction as far as possible and fluid incoming flow opposite direction.
In the present embodiment, this blocking apparatus is according to the position of sump filter, be arranged in zone, 14He Huan corridor, central area 13, and corresponding with connected entrance 15 positions in zone, 14,Huan corridor, central area 13, thereby change the velocity field, turbulence kinetic energy etc. of the current that enter ring zone, corridor 13.
Further, the current total amount that drops into central area 14 due to the passway 11 at melt pit 10 tops is very large, and this blocking apparatus also can be arranged on the key position place of melt pit according to the layout of passway 11, in order to reduce water velocity and tubulence energy.
Together flow, transmit because fragment is mixed in current, therefore the foundation of this blocking apparatus 20, can change distribution and the transmission quantity of fragment in melt pit 10, thereby change the accumulation of fragment on sump filter, change the loss in head that fragment causes, can guarantee the normal operation of ESA/RIS system, guarantee Nuclear Safety.
Further, the surrounding of this blocking apparatus 20 is provided with water flow space, can around assurance device, have on the basis of enough water flow space, effectively changes velocity field and the turbulence kinetic energy of melt pit 10 fluids.The only way which must be passed that the connected entrance 15 of ring corridor floor be the melt pit fluid, according to the distribution of assignment of traffic and flow velocity, tubulence energy, arranged blocking apparatus at the main thoroughfare mouth that encircles the corridor floor.Half left and right that the height of blocking apparatus is fluid level, 0.3m-0.9m; The thickness of blocking apparatus is advisable to be no more than slab thickness, usually gets 01.m-0.5m; The length of blocking apparatus can be identical with the gap of connected entrance 15, and the left and right sides of blocking apparatus is connected with connected entrance 15, tight between blocking apparatus and floor.
The fluid velocity field of arranging the blocking apparatus front and back, the distribution of turbulence kinetic energy are contrasted, as shown in Fig. 3 a-4b.As can be seen from the figure, before blocking apparatus is installed, flow velocity large (as shown in Figure 3 a); After blocking apparatus is installed, flow velocity little (as shown in Fig. 3 b); Before blocking apparatus is installed, tubulence energy large (as shown in Fig. 4 a); After blocking apparatus is installed, tubulence energy little (as shown in Figure 4 b).To fragment, transmission has fine change to the present embodiment, can greatly reduce the amount of debris be transferred on filter screen, thereby reduce the pressure loss that fragment causes, guarantee that the nuclear power ebullator has enough pressure heads, avoid occurring cavitation, guarantee normal operation and the Nuclear Safety of ebullator.
Understandable, above embodiment has only expressed the preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention; It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can carry out independent assortment to above-mentioned technical characterstic, can also make some distortion and improvement, these all belong to protection scope of the present invention; Therefore, all equivalents and modifications of doing with the claims in the present invention scope, all should belong to the covering scope of the claims in the present invention.
Claims (10)
1. one kind changes the device that the melt pit fragment transmits, for the nuclear power station melt pit, described melt pit is provided with sump filter, it is characterized in that, the device of this change melt pit fragment transmission comprises and somely is fixedly installed in described melt pit, changes stream competence in described melt pit and the blocking apparatus of direction.
2. the device of change melt pit fragment transmission according to claim 1, is characterized in that, described blocking apparatus is fixedly installed on the ground of described melt pit by retention mechanism.
3. the device of change melt pit fragment transmission according to claim 2, is characterized in that, described retention mechanism is foot bolt and/or the concrete of fixing described blocking apparatus.
4. the device of change melt pit fragment transmission according to claim 1, is characterized in that, described blocking apparatus is rectangular parallelepiped interception wall.
5. the device of change melt pit fragment transmission according to claim 4, is characterized in that, the height of described interception wall is 0.3-0.9 rice, and length is 0.6-2.4 rice, and width is 0.1 meter-0.5 meter.
6. according to the device of the described change melt pit of claim 1-5 any one fragment transmission, it is characterized in that, the surrounding of described blocking apparatus is provided with water flow space.
7. the device of change melt pit fragment transmission according to claim 6, is characterized in that, the larger xsect of described blocking apparatus is perpendicular to water (flow) direction.
8. the device of change melt pit fragment transmission according to claim 6, is characterized in that, described melt pit locates below ground level, and its top floor is provided with for current and washes away the passway flowed down; And, the zone, ring corridor that described melt pit comprises central area and described sump filter is installed; Be provided with the connected entrance for the current circulation between described central area and zone, described ring corridor.
9. the device of change melt pit fragment transmission according to claim 8, is characterized in that, described blocking apparatus, according to the position of described sump filter, is arranged in zone, ,Huan corridor, described central area and the position corresponding with described connected entrance.
10. the device of change melt pit fragment transmission according to claim 8, is characterized in that, described blocking apparatus is arranged on main described connected entrance position; And, half that the height of described blocking apparatus is fluid level, the length of described blocking apparatus is identical with the gap of described connected entrance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210191943.8A CN103489491A (en) | 2012-06-12 | 2012-06-12 | Device for changing ground pit fragment transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210191943.8A CN103489491A (en) | 2012-06-12 | 2012-06-12 | Device for changing ground pit fragment transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103489491A true CN103489491A (en) | 2014-01-01 |
Family
ID=49829654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210191943.8A Pending CN103489491A (en) | 2012-06-12 | 2012-06-12 | Device for changing ground pit fragment transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103489491A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0587972A (en) * | 1991-09-30 | 1993-04-09 | Hitachi Ltd | Flow regulator and its controling |
| JP2001183490A (en) * | 1999-12-22 | 2001-07-06 | Hitachi Ltd | Reactor core flow control system |
| CN101569806A (en) * | 2009-05-25 | 2009-11-04 | 中国广东核电集团有限公司 | Containment sump filter |
| CN201387731Y (en) * | 2009-04-22 | 2010-01-20 | 中广核工程有限公司 | Containment sump device |
| CN201505480U (en) * | 2009-05-25 | 2010-06-16 | 中国广东核电集团有限公司 | Containment sump strainer assembly |
| CN201556427U (en) * | 2009-11-23 | 2010-08-18 | 中广核工程有限公司 | Nuclear power station safety shell pit and filter screen thereof |
| WO2011030497A1 (en) * | 2009-09-08 | 2011-03-17 | 株式会社 東芝 | Nuclear reactor containment vessel and nuclear power plant using same |
| CN102371090A (en) * | 2010-08-12 | 2012-03-14 | 韩国水力原子力株式会社 | Strainer wall structure, method of manufacturing the same, and filtering method using the same |
-
2012
- 2012-06-12 CN CN201210191943.8A patent/CN103489491A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0587972A (en) * | 1991-09-30 | 1993-04-09 | Hitachi Ltd | Flow regulator and its controling |
| JP2001183490A (en) * | 1999-12-22 | 2001-07-06 | Hitachi Ltd | Reactor core flow control system |
| CN201387731Y (en) * | 2009-04-22 | 2010-01-20 | 中广核工程有限公司 | Containment sump device |
| CN101569806A (en) * | 2009-05-25 | 2009-11-04 | 中国广东核电集团有限公司 | Containment sump filter |
| CN201505480U (en) * | 2009-05-25 | 2010-06-16 | 中国广东核电集团有限公司 | Containment sump strainer assembly |
| WO2011030497A1 (en) * | 2009-09-08 | 2011-03-17 | 株式会社 東芝 | Nuclear reactor containment vessel and nuclear power plant using same |
| CN201556427U (en) * | 2009-11-23 | 2010-08-18 | 中广核工程有限公司 | Nuclear power station safety shell pit and filter screen thereof |
| CN102371090A (en) * | 2010-08-12 | 2012-03-14 | 韩国水力原子力株式会社 | Strainer wall structure, method of manufacturing the same, and filtering method using the same |
Non-Patent Citations (1)
| Title |
|---|
| 唐辉等: "安全壳地坑碎片传输过程研究与优化分析", 《核动力工程》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5000586B2 (en) | Safety injection system with an injection extension duct on the core barrel | |
| US8483347B2 (en) | Upper internals arrangement for a pressurized water reactor | |
| CN101947397B (en) | Containment sump filter of horizontal pressurized water reactor (PWR) nuclear power plant | |
| CN102900053B (en) | Modified model deep-cylinder stilling well | |
| KR20060052234A (en) | Floor tile debris interceptor and transition plenum in a nuclear power plant | |
| CN104347125A (en) | Double-channel natural circulation system device | |
| US5825838A (en) | Reactor flooding system for a retaining molten core materials in a reactor vessel by the improved external vessel cooling capability | |
| CN103489491A (en) | Device for changing ground pit fragment transmission | |
| CN202612019U (en) | Device for preventing generation of vortex | |
| Wei et al. | Experimental study of impact pressures on deep plunge pool floors generated by submerged inclined jets with controlled aeration | |
| CN103047129A (en) | Filter at safety system pump suction inlet inside replacement material water tank inside nuclear power plant | |
| CN107503330B (en) | It is weak in hole to there is pressure is prominent to fall expansion type jet stream stilling pond energy-dissipating system | |
| CN103680646B (en) | The emergence compensating water system of nuclear power station spent fuel reservoir | |
| CN213625500U (en) | Composite stilling pool | |
| CN203250543U (en) | Device for intercepting and storing disintegrating slag | |
| CN209619981U (en) | A kind of quick water delivery of ship lock and collision avoidance system | |
| CN102758555B (en) | Safety device for crossing tower and anchor tower of power transmission line | |
| CN106340327A (en) | Built-in material change water tank of nuclear power station containment vessel | |
| CN202125457U (en) | Impeller for million-kilowatt nuclear secondary containment vessel spray pump | |
| JP4875673B2 (en) | Strainer for reactor containment | |
| CN202771811U (en) | Serious accident processing system capable of charging helium and pressurizing for nuclear power station | |
| CN204649019U (en) | Air cooler | |
| CN204198762U (en) | A kind of autocompensation installation of blast furnace top gearbox cooling system | |
| CN109555097A (en) | A kind of quick water delivery of ship lock and collision avoidance system | |
| CN220079932U (en) | Return type energy dissipation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140101 |