CN206849505U - Current-limiting type injection device - Google Patents
Current-limiting type injection device Download PDFInfo
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- CN206849505U CN206849505U CN201720481426.2U CN201720481426U CN206849505U CN 206849505 U CN206849505 U CN 206849505U CN 201720481426 U CN201720481426 U CN 201720481426U CN 206849505 U CN206849505 U CN 206849505U
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- flow
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- pressure vessel
- injection device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model discloses a kind of current-limiting type injection device, includes connecting flow in pipes, at least one current limiting element being arranged in the flow in pipes of pressure vessel；The flow in pipes is communicated to the lower chambers of the pressure vessel；The circumferential lateral surface of the current limiting element and the internal face of the flow in pipes coordinate, the inner passage of the current limiting element includes the internal diameter converging transition and internal diameter divergent segment being connected along fluid flow direction, and the junction of the internal diameter converging transition and internal diameter divergent segment forms passage throat.Current-limiting type injection device of the present utility model, by setting current limiting element in flow in pipes, the cut flow of flow in pipes is limited, current-limiting type injection device is efficiently modified；When reactor flow in pipes is broken, rate of flow of fluid can be effectively limited, slows down coolant loss speed, reaches the purpose of alleviation accident, improves the security performance of reactor.
Description
Technical field
It the utility model is related to reactor Nuclear Power Plant Equipment technical field, more particularly to a kind of current-limiting type injection device.
Background technology
Reactor nuclear power plant is needed with the ability for resisting various burst accidents, including design basis accident and super design base
Quasi- accident.Wherein, reactor coolant loop forfeiture cooling agent accident (LOCA) is used as one of most important design basis accident,
It is used to examine the security of reactor nuclear power plant and the design of guiding engineered safeguards features always.Cooling agent safety injection system
As a part for engineered safeguards features, it is generally used for the emergent cooling of the reactor core after LOCA accident and boronation, to control and alleviate
Accident, prevent from expanding to beyond design basis accident.
Large break funeral loss of-coolant accident (LOCA) (Large Break Loss Of Cooling the most severe are occurring
Accident, LB LOCA) after, high energy pipeline ruptures, coolant temperature pressure be up to more than 300 degrees Celsius and 15Mpa with
On, original water loading amount of reactor water system is lost in rapidly in the form of critical flow, is almost emptied completely within several seconds time.
And under less cut loss of-coolant accident (LOCA), slow down although the loss speed of water loading amount is relative, but still very likely cause reactor core naked
Dew, causes negative consequence.Under loss of-coolant accident (LOCA), it is necessary to by the enough safety injection systems of ability quickly to reactor pressure vessel
Water filling simultaneously floods reactor core again, with lasting export reactor core decay heat.
Safety injection system generally includes high pressure, middle pressure and low pressure peace note, can be real with the different pressures stage after LOCA
Apply effective safety injection.Safety injection system access coolant system position generally have cold leg, descending branch ring cavity or on
End socket.For example, access point is cold leg, the cooling water of safety injection system enters after two (or three) cold legs, passes through pressure
Container ozzle enters descending branch ring cavity, flows downward herein into low head, then baffling is upward, further flows into reactor core.
The blowdown phase after LOCA, in addition in lower chambers still member-retaining portion liquid, in pressure vessel cooling agent all by
Gradually flash-off of steam.After safety injection cooling water starts injection, the deficient cold water of big flow makes steam condense and attached in injection port
Near to form water plug, the vibration of water plug causes the fluctuation into the peace water filling for declining chamber.Reverse flow in reactor core and decline chamber
Steam prevent peace water filling enter decline chamber, until before blowdown phase terminates, reverse flow steam it is sufficiently low when, just allow peace note
Water, which enters, declines chamber.The stage is referred to as pacifying the note bypass stage, that is, pacifies the rank of the directly logical super cooled sect cut excretion of water filling bypass reactor core
Section, the time range in this stage is about 20-30s.
During being poured water again after LOCA, although safety injection tank has higher flow injection, almost without flow by reactor core,
So that clad temperature rises again, untill flooding beginning again.During bypass, cooling water can be stopped in reactor core descending branch
The top of ring cavity, these cooling waters will accumulate in import pipeline section, then be flowed out at the cut of reactor cooling system, without band
Reactor core decay heat is walked, until reactor core steam stream can not hinder cooling water to be flowed into lower chambers again.Therefore, generate directly to anti-
That answers core pressure vessel water filling is directly injected into device, and this is directly injected into device, and to effectively prevent reactor core steam stream cold to safety injection
But the inhibition of water, it can obtain preferably suppressing the effect of other row, there is more preferable inhibition to accident.But thus derive
A kind of important and more severe accident：Pressure vessel is directly injected into the break accident that installs pipes.After pipeline breaking, safety
Injection moisturizing can flow directly into cut in reactor core bottom, and reactor core water loading amount can also be lost.It can be seen that the accident can not only directly result in
The forfeiture of pressure vessel water loading amount, also results in the forfeiture of Partial security injectability, causes worse damage sequence.
Utility model content
The technical problems to be solved in the utility model is, there is provided a kind of current-limiting type injection device for limiting cut flow.
Technical scheme is used by the utility model solves its technical problem：A kind of current-limiting type injection device is provided, wrapped
Include flow in pipes, at least one current limiting element being arranged in the flow in pipes of connection pressure vessel；The flow in pipes
It is communicated to the lower chambers of the pressure vessel；The circumferential lateral surface of the current limiting element and the internal face of the flow in pipes coordinate,
The inner passage of the current limiting element includes the internal diameter converging transition and internal diameter divergent segment being connected along fluid flow direction, described interior
The junction of footpath converging transition and internal diameter divergent segment forms passage throat.
Preferably, the flow in pipes is located in the pressure vessel；The output end of the flow in pipes stretches into the pressure
The lower chambers of force container, internal face of the injection end along the pressure vessel is vertically extending, is stretched from the upper chamber of the pressure vessel
Go out pressure vessel.
Preferably, internal face of the output end of the flow in pipes along the pressure vessel bottom is convexly curved.
Preferably, the flow in pipes is located at outside the pressure vessel；The output end of the flow in pipes stretches into the pressure
The lower chambers of force container, outer wall of the injection end along the pressure vessel are vertically extending upwardly.
Preferably, the relatively described pressure vessel of the output end of the flow in pipes extends vertically into the lower chambers.
Preferably, the current-limiting type injection device also includes outside the pressure vessel, is set in the flow in pipes
The irradiation monitoring pipe of periphery.
Preferably, the current limiting element is located in output end and/or the injection end of the flow in pipes.
Preferably, the internal diameter of the flow in pipes is 10cm, and the internal diameter of the passage throat is 7.5cm.
Preferably, the current-limiting type injection device also includes the assignment of traffic unit for being arranged on pressure vessel inner bottom part；
The assignment of traffic unit includes flow distribution baffle, the several pod apertures being distributed on the flow distribution baffle；Institute
The output end for stating flow in pipes is plugged on the flow distribution baffle.
Preferably, the flow distribution baffle is hemispherical dome structure.
The beneficial effects of the utility model：By setting current limiting element in flow in pipes, the cut of flow in pipes is limited
Flow, current-limiting type injection device is efficiently modified；When reactor flow in pipes is broken, fluid stream can be effectively limited
Speed, slow down coolant loss speed, reach the purpose of alleviation accident, improve the security performance of reactor.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：
Fig. 1 is cross-section structure signal of the current-limiting type injection device of the utility model first embodiment on pressure vessel
Figure；
Fig. 2 be the utility model first embodiment current-limiting type injection device in structure of the current limiting element in flow in pipes
Schematic diagram；
Fig. 3 is cross-section structure signal of the current-limiting type injection device of the utility model second embodiment on pressure vessel
Figure；
Fig. 4 is cross-section structure signal of the current-limiting type injection device of the utility model 3rd embodiment on pressure vessel
Figure；
Fig. 5 is along the cross-sectional view of line A-A in Fig. 4；
Fig. 6 is cross-section structure signal of the current-limiting type injection device of the utility model fourth embodiment on pressure vessel
Figure；
Fig. 7 is along the cross-sectional view of line B-B in Fig. 6；
Fig. 8 is the utility model and the current limitation effect figure of prior art.
Embodiment
In order to which the technical characteristics of the utility model, purpose and effect are more clearly understood, it is detailed now to compare accompanying drawing
Illustrate specific embodiment of the present utility model.
As shown in Figure 1, 2, the current-limiting type injection device of the utility model first embodiment, including connection pressure vessel 10
Flow in pipes 20, at least one current limiting element 30 being arranged in flow in pipes 20.Wherein, flow in pipes 20 is communicated to pressure appearance
The lower chambers of device 10；The circumferential lateral surface of current limiting element 30 coordinates with the internal face of flow in pipes 20, and it is in flow in pipes 20
The local resistance for increasing flow of fluid in flow in pipes 20 is set, limits cut flow.
Current limiting element 30 is rigidly attached to the internal face of flow in pipes 30, overall annular in shape.
The inner passage of current limiting element 30 may include the internal diameter converging transition 31 being connected along fluid flow direction and internal diameter gradually
Expanding section 32, when the fluid in flow in pipes 20 flows through current limiting element 30, fluid area is first gradually reduced along internal diameter converging transition 31,
Gradually increase further along internal diameter divergent segment 32.The junction of internal diameter converging transition 31 and internal diameter divergent segment 32 forms passage throat 33,
The internal diameter of passage throat 33 is at the inner passage circulation area minimum of current limiting element 30.
The inner surface of current limiting element 30 is streamlined, reduces flow resistance caused by circulation area changes to greatest extent
The increase of power.
Flow in pipes 20 includes output end 21 and the injection end 22 being connected, and current limiting element 30 can be located at flow in pipes 20
In output end 21 and/or injection end 22.
In the present embodiment, flow in pipes 20 is located in pressure vessel 10.The output end 21 of flow in pipes 20 stretches into pressure
The lower chambers of container 10, internal face of the injection end 22 along pressure vessel 10 is vertically extending, is stretched out from the upper chamber of pressure vessel 10
Pressure vessel 10.Stretch out pressure vessel 10 end can be relatively vertically extending injection end 22 bend 90 degree stretch out pressure vessels 10
Outside.
Further, as shown in fig. 1, in the present embodiment, the output end 21 of flow in pipes 20 is along the bottom of pressure vessel 10
Internal face be convexly curved.
As shown in figure 3, the current-limiting type injection device of the utility model second embodiment, includes connecting the note of pressure vessel 10
Enter pipeline 20, at least one current limiting element 30 being arranged in flow in pipes 20 (with reference to shown in figure 2).Wherein, flow in pipes 20
It is communicated to the lower chambers of pressure vessel 10；The circumferential lateral surface of current limiting element 30 coordinates with the internal face of flow in pipes 20, and it is being noted
Enter the local resistance that the setting in pipeline 20 increases flow of fluid in flow in pipes 20, reduce flow.
Current limiting element 30 can refer to associated description in above-mentioned first embodiment, will not be repeated here.
In the present embodiment, flow in pipes 20 is located at outside pressure vessel 10.The output end 21 of flow in pipes 20 stretches into pressure
The lower chambers of container 10, outer wall of the injection end 22 along pressure vessel 10 are vertically extending upwardly.
As shown in Figure 3, in the present embodiment, the relative pressure vessel 10 of output end 21 of flow in pipes 20 extends vertically into cavity of resorption
Room.
Further, in the present embodiment, current-limiting type injection device also includes outside pressure vessel 10, is set in ascending pipe
The irradiation monitoring pipe 40 of the periphery of road 20, can exercise supervision shielding to the radiation of fluid in flow in pipes 20.
As shown in figure 4, the current-limiting type injection device of the utility model 3rd embodiment, includes connecting the note of pressure vessel 10
Enter pipeline 20, at least one current limiting element 30 being arranged in flow in pipes 20 (with reference to shown in figure 2).Wherein, flow in pipes 20
It is communicated to the lower chambers of pressure vessel 10；The circumferential lateral surface of current limiting element 30 coordinates with the internal face of flow in pipes 20, and it is being noted
Enter the local resistance that the setting in pipeline 20 increases flow of fluid in flow in pipes 20, reduce flow.
Current limiting element 30, flow in pipes 20 can refer to associated description in above-mentioned first embodiment, will not be repeated here.
With reference to Fig. 4,5, the present embodiment is unlike first embodiment：Current-limiting type injection device also includes being arranged on pressure
The assignment of traffic unit of the inner bottom part of container 10.
Assignment of traffic unit may include flow distribution baffle 51, the several pod apertures 52 being distributed on flow distribution baffle 51.Note
The output end 21 for entering pipeline 20 is plugged on flow distribution baffle 51.
In the present embodiment, flow distribution baffle 51 is hemispherical dome structure.Several pod apertures 52 are divided into inside and outside multi-turn, each circle
The diameter of pod apertures is gradually reduced from close to the center of flow distribution baffle 51 to away from the center of flow distribution baffle 51.
As shown in fig. 6, the current-limiting type injection device of the utility model fourth embodiment, includes connecting the note of pressure vessel 10
Enter pipeline 20, at least one current limiting element 30 being arranged in flow in pipes 20 (with reference to shown in figure 2).Wherein, flow in pipes 20
It is communicated to the lower chambers of pressure vessel 10；The circumferential lateral surface of current limiting element 30 coordinates with the internal face of flow in pipes 20, and it is being noted
Enter the local resistance that the setting in pipeline 20 increases flow of fluid in flow in pipes 20, reduce flow.
Current limiting element 30 can refer to associated description in above-mentioned first embodiment, and flow in pipes 20 is located at outside pressure vessel 10；
Flow in pipes 20, irradiation monitoring pipe 40 specifically set and can refer to associated description in above-mentioned second embodiment, will not be repeated here.
With reference to Fig. 6,7, the present embodiment is unlike second embodiment：Current-limiting type injection device also includes being arranged on pressure
The assignment of traffic unit of the inner bottom part of container 10.
Assignment of traffic unit may include flow distribution baffle 51, the several pod apertures 52 being distributed on flow distribution baffle 51.Note
The relative discharge distribution plate 51 of output end 21 for entering pipeline 20 is vertically plugged on flow distribution baffle 51.
In the present embodiment, flow distribution baffle 51 is hemispherical dome structure.Several pod apertures 52 are divided into inside and outside multi-turn, each circle
The diameter of pod apertures is gradually reduced from close to the center of flow distribution baffle 51 to away from the center of flow distribution baffle 51.
In each embodiment of current-limiting type injection device of the present utility model, flow in pipes 20 preferably has two, the company of being oppositely arranged
The lower chambers of logical pressure vessel 10.
For the utility model in use, after cut loss of-coolant accident (LOCA) occurs for reactor, primary Ioops cooling agent is rapid by cut
It is lost in.Due to the fluid HTHP in pipeline, often beyond 300 DEG C, pressure ruptures temperature often beyond 15.5MPa
Pipeline is often in critical stream mode.Now, if cut occurs on the flow in pipes of no installation current limiting element, its cut stream
Amount may be up to 1000 kilograms of orders of magnitude per second (in the case of no current limiting element), to reactor pressure vessel water loading amount and safety
The ability of injecting systems proposes high requirement.
By taking 20 a diameter of 10cm of flow in pipes as an example, diameter can be reduced into respect to flow in pipes 20 at passage throat 33
7.5cm, 20kg/s peace beam amount under normal 2MPa back pressures.
After the double of flow in pipes 20 occurs, estimated by Gros d ' Aillon critical flows formula, the peak of 10cm sizes
Value cut flow is up to 900kg/s, and the peak value cut flow for installing current limiting element 30 additional enters only less than 500kg/s to accident
Cheng great great is favourable.It can be seen that the cut flow under critical stream mode is determined by critical flow velocity and Break size.Therefore, critical flow velocity
In the case of certain, after being directly injected into the installation current limiting element 30 of pipeline 20, the presence of passage throat 33 is limited by passage larynx
The flow in portion 33, being equal to reduces Break size, and great restriction effect is realized to cut flow.Specific current limitation effect is such as
Shown in Fig. 8.
In Fig. 8, transverse axis represents the time (s), and the longitudinal axis represents flow (kg/s)；Wherein curve 1 is the limit provided with current limiting element
Flow curve, curve 2 are the current limit curve of fluid element of not limiting.It can be seen that the current limitation effect provided with current limiting element is good.
In summary, it the presence of current limiting element, can effectively suppress cut flow under flow in pipes break accident operating mode, delay
Solve damage sequence.
Embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of current-limiting type injection device, it is characterised in that including connecting the flow in pipes of pressure vessel, at least one being arranged on
Current limiting element in the flow in pipes；The flow in pipes is communicated to the lower chambers of the pressure vessel；The current limiting element
The internal face of circumferential lateral surface and the flow in pipes coordinate, the inner passage of the current limiting element is included along fluid flow direction
The internal diameter converging transition and internal diameter divergent segment being connected, the junction of the internal diameter converging transition and internal diameter divergent segment form passage larynx
Portion.
2. current-limiting type injection device according to claim 1, it is characterised in that the flow in pipes is located at pressure appearance
In device；The output end of the flow in pipes stretches into the lower chambers of the pressure vessel, inwall of the injection end along the pressure vessel
Face is vertically extending, stretches out pressure vessel from the upper chamber of the pressure vessel.
3. current-limiting type injection device according to claim 2, it is characterised in that the output end of the flow in pipes is described in
The internal face of pressure vessel bottom is convexly curved.
4. current-limiting type injection device according to claim 1, it is characterised in that the flow in pipes is located at pressure appearance
Outside device；The output end of the flow in pipes stretches into the lower chambers of the pressure vessel, outer wall of the injection end along the pressure vessel
It is vertically extending upwardly.
5. current-limiting type injection device according to claim 4, it is characterised in that the output end of the flow in pipes is with respect to institute
State pressure vessel and extend vertically into the lower chambers.
6. current-limiting type injection device according to claim 4, it is characterised in that the current-limiting type injection device also includes position
In outside the pressure vessel, be set in the irradiation monitoring pipe of the flow in pipes periphery.
7. current-limiting type injection device according to claim 1, it is characterised in that the current limiting element is located at the ascending pipe
In the output end and/or injection end in road.
8. current-limiting type injection device according to claim 1, it is characterised in that the internal diameter of the flow in pipes is 10cm,
The internal diameter of the passage throat is 7.5cm.
9. according to the current-limiting type injection device described in claim any one of 1-8, it is characterised in that the current-limiting type injection device
Also include the assignment of traffic unit for being arranged on pressure vessel inner bottom part；
The assignment of traffic unit includes flow distribution baffle, the several pod apertures being distributed on the flow distribution baffle；The note
The output end for entering pipeline is plugged on the flow distribution baffle.
10. current-limiting type injection device according to claim 9, it is characterised in that the flow distribution baffle is hemispherical junction
Structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720481426.2U CN206849505U (en) | 2017-05-03 | 2017-05-03 | Current-limiting type injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720481426.2U CN206849505U (en) | 2017-05-03 | 2017-05-03 | Current-limiting type injection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206849505U true CN206849505U (en) | 2018-01-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720481426.2U Active CN206849505U (en) | 2017-05-03 | 2017-05-03 | Current-limiting type injection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206849505U (en) |
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2017
- 2017-05-03 CN CN201720481426.2U patent/CN206849505U/en active Active
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