CN107170501B - A kind of method for suppressing vehicle repair major natural cycle system flowing instability - Google Patents
A kind of method for suppressing vehicle repair major natural cycle system flowing instability Download PDFInfo
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- CN107170501B CN107170501B CN201710384226.XA CN201710384226A CN107170501B CN 107170501 B CN107170501 B CN 107170501B CN 201710384226 A CN201710384226 A CN 201710384226A CN 107170501 B CN107170501 B CN 107170501B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/08—Regulation of any parameters in the plant
- G21D3/12—Regulation of any parameters in the plant by adjustment of the reactor in response only to changes in engine demand
- G21D3/14—Varying flow of coolant
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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
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- High Energy & Nuclear Physics (AREA)
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Abstract
The invention discloses a kind of method and apparatus for suppressing vehicle repair major natural cycle system flowing instability, by increasing two-way Venturi meter and high-precision quick response throttle regulator in the connecting tube of natural cycle system and voltage-stablizer, natural cycle system can be suppressed pressure drop concussion flowing instability occurs, improve the natural-circulation capacity of two phase natural circulation system, forced circulation system is compared in solution, natural cycle system driving force is weaker, it is easier to the problem of flow instabilities such as pressure drop concussion, density wave occurs.It is an advantage of the invention that：Inhibit vehicle repair major natural cycle system to flow unstable, be easy to natural cycle system flowing heat transfer, critical heat flux density research；Improve on existing convenient and easy, it is not necessary to change a complete set of equipment.
Description
Technical field
The present invention relates to one kind to suppress vehicle repair major natural cycle system, and in particular to one kind suppresses vehicle repair major and followed naturally
The method and apparatus of loop system flowing instability.
Background technology
In vehicle repair major heating system, because vehicle repair major steam quality changes, buoyancy or fluid volume change, it can cause to flow
Flow instability occurs for amount, temperature and pressure and other parameters concussion, vehicle repair major system.Flowing occurs for vehicle repair major system not
Stability phenomenon, adverse effect is caused to equipment and its safety.For nuclear reactor, flow instability can not only reduce it
Runnability, go back the safety of entail dangers to reactor.Therefore how to avoid nuclear reactor system that flow instability occurs is reaction
One important research direction of heap safety.
Natural Circulation is caused by density contrast caused by the temperature difference being close between the thermal source of road bottom and the low-temperature receiver on top
Drive ram circulates.Because Natural Circulation does not need the active equipment such as pump, blower fan, it has been obtained increasingly in industrial system
It is widely applied, the decay heat of reactor core exports safely especially under nuclear reactor system accident conditions.Compared to forced circulation system
System, natural cycle system driving force are weaker, it is easier to the flow instabilities such as pressure drop concussion, density wave occur.
The content of the invention
The technical problems to be solved by the invention are to compare forced circulation system, and natural cycle system driving force is weaker, more
Easily there are the flow instabilities such as pressure drop concussion, density wave, and it is an object of the present invention to provide a kind of suppress vehicle repair major Natural Circulation system
Forced circulation system is compared in the method and apparatus of system flowing instability, solution, and natural cycle system driving force is weaker, it is easier to goes out
The problem of flow instabilities such as existing pressure drop concussion, density wave.
The present invention is achieved through the following technical solutions：
A kind of method and apparatus for suppressing vehicle repair major natural cycle system flowing instability, including two phase natural circulation system
System and voltage-stablizer, in addition to high-precision quick response section is set gradually in the connecting tube of voltage-stablizer to two phase natural circulation system
Flow modulation device and two-way Venturi meter, two-way Venturi meter also shake flow instability control by Pressure Drop Type
Device processed is connected with high-precision quick response throttle regulator.
The two-way Venturi meter uses the two-way venturi stream for measuring function with two-way, low discharge, in real time
Gauge.When pressure drop concussion flowing instability occurs in two phase natural circulation system, the fluid flow direction of two phase natural circulation system is steady
Depressor, at this moment the flow in connecting tube is positive flow.After fluid flows to voltage-stablizer, the pressure of voltage-stablizer rises and is more than two-phase
The pressure of natural cycle system, then fluid flow back to two phase natural circulation system from voltage-stablizer, flow now is negative sense flow.
And positive flow and negative sense flow are all smaller, therefore two-way Venturi meter uses with two-way, low discharge, in real time
Measure the two-way Venturi meter of function.
It is a kind of to suppress the method for vehicle repair major natural cycle system flowing instability, including the following step of progress is circulated successively
Suddenly：
A, the flow signal on two-way Venturi meter collection voltage-stablizer to the connecting tube of two phase natural circulation system is simultaneously
It is sent to Pressure Drop Type concussion flow instability controller；
B, the flow signal that Pressure Drop Type concussion flow instability controller inputs to two-way Venturi meter is carried out
Analysis；
C, Pressure Drop Type concussion flow instability controller outputs a control signal to height according to the step B results analyzed
Precision quick response throttle regulator；
D, high-precision quick response throttle regulator shakes the receiving of flow instability controller according to from Pressure Drop Type
Control signal action, adjust flow.
Flow signal analysis method in the step B is：
B1, the two-way Venturi meter first paragraph time △ t of detection1Interior peak flow values Fmax1And minimum stream value
Fmin1, detect first paragraph time △ t1Second segment time △ t afterwards2Interior peak flow values Fmax2And minimum stream value Fmin2；
B2, by Fmax1With Fmax2Or Fmin1With Fmin2It is compared；
If B3, Fmax1> Fmax2Or Fmin1< Fmin2, show the undulating flow between two phase natural circulation system and voltage-stablizer
Amount is gradually reduced, and natural circulation flow can tend towards stability, and it is unstable that Pressure Drop Type concussion flowing does not occur in natural cycle system
It is fixed, if Fmax1< Fmax2Or Fmin1> Fmin2, show that the fluctuating flow rate between two phase natural circulation system and voltage-stablizer gradually increases
Greatly, natural circulation flow starts to dissipate, and Pressure Drop Type concussion flowing instability occurs in natural cycle system.
The method of output control signal is in the step C：If point of Pressure Drop Type concussion flow instability controller
Analysis result is that two phase natural circulation system does not occur flowing instability, and Pressure Drop Type concussion flow instability controller is not sent
Control signal gives high-precision quick response throttle regulator；If Pressure Drop Type shakes the analysis of flow instability controller
As a result there is flowing instability for two phase natural circulation system, Pressure Drop Type concussion flow instability controller sends control letter
Number give high-precision quick response throttle regulator.
The present invention compared with prior art, has the following advantages and advantages：
1st, a kind of method and apparatus for suppressing vehicle repair major natural cycle system flowing instability of the present invention, it is suppressed that vapour-liquid
Two phase natural circulation system flow it is unstable, be easy to natural cycle system flowing heat transfer, critical heat flux density research；
2nd, a kind of method and apparatus for suppressing vehicle repair major natural cycle system flowing instability of the present invention, in existing equipment
Upper improvement is convenient and easy, it is not necessary to changes a complete set of equipment.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Mark and corresponding parts title in accompanying drawing：
1- two phase natural circulation systems, 2- voltage-stablizers, the two-way Venturi meters of 3-, 4- throttle regulators, 5- pressure
Drop type shakes flow instability controller.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
As shown in figure 1, a kind of method and apparatus for suppressing vehicle repair major natural cycle system flowing instability of the present invention, bag
Two phase natural circulation system 1 and voltage-stablizer 2 are included, in addition in the connecting tube of voltage-stablizer 2 to two phase natural circulation system 1 successively
High-precision quick response throttle regulator 4 and two-way Venturi meter 3, the high-precision quick response flow restriction control are set
Device 4 is electric control valve, two-way Venturi meter 3 also by Pressure Drop Type shake flow instability controller 5 with it is high-precision
Degree quick response throttle regulator 4 connects, and the Pressure Drop Type concussion flow instability controller 5 is iMX.8.It is described double
To Venturi meter 3 using the two-way Venturi meter 3 with two-way, low discharge, real-time measurement function.When two-phase from
When pressure drop concussion flowing instability occurs in the right circulatory system, the fluid of two phase natural circulation system 1 flows to voltage-stablizer 2, at this moment connects
Flow in adapter is positive flow.After fluid flows to voltage-stablizer 2, the pressure of voltage-stablizer 2 rises and is more than two phase natural circulation
The pressure of system 1, then fluid flow back to two phase natural circulation system 1 from voltage-stablizer 2, flow now is negative sense flow.And
Positive flow and negative sense flow is all smaller, therefore two-way Venturi meter is used with two-way, low discharge, measurement in real time
The two-way Venturi meter of function.
Embodiment 2
It is a kind of to suppress the method for vehicle repair major natural cycle system flowing instability, including the following step of progress is circulated successively
Suddenly：
A, two-way Venturi meter 3 gathers the flow signal on voltage-stablizer 2 to the connecting tube of two phase natural circulation system 1
And it is sent to Pressure Drop Type concussion flow instability controller 5；
B, Pressure Drop Type concussion flow instability controller 5 enters to the flow signal of two-way Venturi meter 3 input
Row analysis；
C, Pressure Drop Type concussion flow instability controller 5 is output a control signal to according to the step B results analyzed
High-precision quick response throttle regulator 4；
D, high-precision quick response throttle regulator 4 connects according to from Pressure Drop Type concussion flow instability controller 5
The control signal action received, adjusts flow.
Flow signal analysis method in the step B is：
B1, detection first paragraph time △ t1Peak flow values F in=5smax1=5L and minimum stream value Fmin1=1L,
Detect first paragraph time △ t1Second segment time △ t afterwards2Peak flow values F in=5smax2=4.5L and minimum stream value
Fmin2=2L；
B2, by Fmax1With Fmax2It is compared, or Fmin1With Fmin2It is compared；
B3、Fmax1> Fmax2Or Fmin1< Fmin2, show the undulating flow between two phase natural circulation system 1 and voltage-stablizer 2
Amount is gradually reduced, and natural circulation flow can tend towards stability, and it is unstable that Pressure Drop Type concussion flowing does not occur in natural cycle system
Fixed, Pressure Drop Type concussion flow instability controller 5 does not send control signal to high-precision quick response throttle regulator
4。
Embodiment 3
The present embodiment differs only in embodiment 2, B1, detection first paragraph time △ t1Peak flow values in=5s
Fmax1=5L and minimum stream value Fmin1=1L, detect first paragraph time △ t1Second segment time △ t afterwards2Maximum in=5s
Flow value Fmax2=6.5L and minimum stream value Fmin2=2L； Fmax1< Fmax2, show two phase natural circulation system 1 and voltage stabilizing
Fluctuating flow rate between device 2 gradually increases, and natural circulation flow starts to dissipate, and Pressure Drop Type concussion stream occurs in natural cycle system
Dynamic unstable, Pressure Drop Type concussion flow instability controller 5 sends control signal to high-precision quick response flow restriction control
Device 4.
Embodiment 4
The present embodiment differs only in embodiment 2, B1, detection first paragraph time △ t1Peak flow values in=5s
Fmax1=5L and minimum stream value Fmin1=1L, detect first paragraph time △ t1Second segment time △ t afterwards2Maximum in=5s
Flow value Fmax2=6.5L and minimum stream value Fmin2=0.5L； Fmax1< Fmax2Or Fmin1> Fmin2, show two-phase nature
Fluctuating flow rate between the circulatory system 1 and voltage-stablizer 2 gradually increases, and natural circulation flow starts to dissipate, and natural cycle system goes out
Existing Pressure Drop Type concussion flowing instability, Pressure Drop Type concussion flow instability controller 5 send control signal to high accuracy
Quick response throttle regulator 4.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (2)
1. it is a kind of suppress vehicle repair major natural cycle system flowing instability method, it is characterised in that including circulate successively into
Capable following steps：
A, two-way Venturi meter（3）Gather voltage-stablizer（2）To two phase natural circulation system（1）Connecting tube on flow letter
Number and be sent to Pressure Drop Type concussion flow instability controller（5）；
B, Pressure Drop Type concussion flow instability controller（5）To two-way Venturi meter（3）The flow signal of input enters
Row analysis, judges two phase natural circulation system（1）Whether instability of flow is occurred；
C, Pressure Drop Type concussion flow instability controller（5）Height is output a control signal to according to the step B results analyzed
Precision quick response throttle regulator（4）；
D, high-precision quick response throttle regulator（4）Flow instability controller is shaken according to from Pressure Drop Type（5）Connect
The control signal action received, adjusts flow；
Flow signal analysis method in the step B is：
B1, the two-way Venturi meter of detection（3）First paragraph time △ t1Interior peak flow values Fmax1And minimum stream value
Fmin1, detect first paragraph time △ t1Second segment time △ t afterwards2Interior peak flow values Fmax2And minimum stream value Fmin2；
B2, by Fmax1With Fmax2It is compared, or Fmin1With Fmin2It is compared；
If B3, Fmax1> Fmax2Or Fmin1< Fmin2, show two phase natural circulation system（1）With voltage-stablizer（2）Between fluctuation
Flow is gradually reduced, and natural circulation flow can tend towards stability, and natural cycle system Pressure Drop Type concussion flowing does not occur not
It is stable, if Fmax1< Fmax2Or Fmin1> Fmin2, show two phase natural circulation system（1）With voltage-stablizer（2）Between undulating flow
Gradually increase, natural circulation flow start to dissipate amount, and Pressure Drop Type concussion flowing instability occurs in natural cycle system.
2. a kind of method for suppressing vehicle repair major natural cycle system flowing instability according to claim 1, its feature
It is, the method for output control signal is in the step C：If Pressure Drop Type shakes flow instability controller（5）Point
Analysis result is two phase natural circulation system（1）Do not occur flowing instability, Pressure Drop Type concussion flow instability controller（5）
Control signal is not sent to high-precision quick response throttle regulator（4）；If Pressure Drop Type shakes flow instability control
Device processed（5）Analysis result be two phase natural circulation system（1）There is flowing instability, Pressure Drop Type concussion flow instability
Controller（5）Control signal is sent to high-precision quick response throttle regulator（4）.
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| CN201710384226.XA CN107170501B (en) | 2017-05-26 | 2017-05-26 | A kind of method for suppressing vehicle repair major natural cycle system flowing instability |
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| US3916445A (en) * | 1973-02-23 | 1975-10-28 | Westinghouse Electric Corp | Training simulator for nuclear power plant reactor coolant system and method |
| US5103897A (en) * | 1991-06-05 | 1992-04-14 | Martin Marietta Corporation | Flowrate controller for hybrid capillary/mechanical two-phase thermal loops |
| JP5101012B2 (en) * | 2005-12-22 | 2012-12-19 | 三菱重工業株式会社 | Gas-liquid two-phase flow simulation test apparatus and gas-liquid two-phase flow simulation test method |
| CN103219055B (en) * | 2013-04-09 | 2015-06-24 | 上海交通大学 | Device for detecting clearance flow instability phenomenon in nuclear reactor |
| CN103438942B (en) * | 2013-08-26 | 2016-05-25 | 中国核动力研究设计院 | Double-venturi tube |
| CN103471810B (en) * | 2013-09-16 | 2015-12-02 | 哈尔滨工程大学 | Interbank two-phase flow instability and alternating thermal stress development test device under removal of load disturbance |
| CN103851604B (en) * | 2014-02-28 | 2016-01-13 | 清华大学 | A kind of orifice union for once through steam generator |
| US11266959B2 (en) * | 2014-10-08 | 2022-03-08 | Versum Materials Us, Llc | Low pressure fluctuation apparatuses for blending fluids, and methods of using the same |
| CN104330436B (en) * | 2014-11-24 | 2016-09-07 | 中国核动力研究设计院 | Experimental provision and the mensuration of dryness of wet steam for two-phase Research on Heat Transfer Characteristics |
| CN105225708B (en) * | 2015-08-26 | 2017-06-23 | 西南石油大学 | A kind of Natural Circulation and forced circulation experimental loop system |
| CN106229017B (en) * | 2016-08-03 | 2018-07-31 | 哈尔滨工程大学 | A kind of two-phase flow device for system natural-circulation capacity Study of Lifting |
| CN106340329B (en) * | 2016-10-31 | 2017-12-15 | 中国核动力研究设计院 | Reactor thermo-hydraulics simulation test device and hydrodynamic characteristics analogy method |
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