CN110223790A - Stagnation pressure external container cooling test rack in a kind of fusant heap - Google Patents
Stagnation pressure external container cooling test rack in a kind of fusant heap Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 238000001816 cooling Methods 0.000 title claims abstract description 46
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000000498 cooling water Substances 0.000 claims description 41
- 238000002474 experimental method Methods 0.000 claims description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
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- 238000007689 inspection Methods 0.000 claims 1
- 239000011800 void material Substances 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 8
- 238000004781 supercooling Methods 0.000 description 6
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- 238000004880 explosion Methods 0.000 description 1
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Abstract
The invention discloses stagnation pressure external container cooling test rack in a kind of fusant heap, experimental stand includes: two-dimentional test section, three dimensional taest section, ascent stage, upper water box, flowmeter, descending branch, valve, lower header, heating system, system for detecting temperature, pre-heating system and cooling system；The bottom end of the top of two-dimentional test section or three dimensional taest section connection ascent stage, the side of the top connection upper water box of ascent stage, the top of the bottom end connection flowmeter of upper water box, the top of the bottom end connection descending branch of flowmeter, the bottom end connecting valve of descending branch, valve connects the top side of lower header, and the top other side of lower header connects the bottom end of two-dimentional test section or three dimensional taest section.It can obtain the interior wall temperature of the bringing-up section under different operating conditions, the fluid temperature (F.T.) of runner, test section pressure difference, void fraction etc. changes over time parameter, and changeable constant parameter value studies its influence to experimental result.
Description
Technical field
The present invention relates to nuclear power generator experimental technical fields, cold more particularly to stagnation pressure external container in fusant heap
But three dimensional taest section.
Background technique
In nuclear power developing course, nuclear safety is always people's Important Problems of concern.In world wide at present
There is more than 400 in-service nuclear power station, the overwhelming majority is built according to two generation nuclear power technologies.Although nuclear power plant has had taken up a series of
Come the generation that avoids a nasty accident the major accident of super design reference may still occur for measure under extreme condition, in three
Island accident, Chernobyl accident and Fukushima accident.Once major accident occurs, it is more likely that cause vapour explosion, radioactivity
Substance such as largely discharges at the serious consequences.Investigation shows nuclear power plant once accident occurs, as long as guaranteeing pressure vessel and containment
Integrality can largely reduce the release of radioactive substance.Since then, it has gradually formed in fusant heap and has been detained in the world
Cooling outside the pressure vessel of (In-Vessel Retention, IVR) (External Reactor Vessel Cooling,
ERVC) severe accident relieving strategy.I.e. cooling water flows through the runner formed between pressure vessel outer wall and insulating layer, will pass through pressure
The heat of fusant derived from force container lower head wall surface is taken out of, faces to prevent lower head of pressure vessel surface from boiling occurs
Boundary guarantees the integrality of lower head.Currently, IVR-ERVC has become using AP1000 series as the advanced nuclear power of the third generation of representative
The severe accident relieving measure of a core in technology.Equally, in other advanced nuclear reactor types, IVR-ERVC equally has
Wide application prospect.
Kymalaiinen etc. is studied for Loviisa power plant, and system proposes the serious thing of IVR-ERVC for the first time
Therefore the evaluation method of mitigation strategy and external cooling effectiveness.Test is using one-dimensional full-height circuit, to fluid in runner
Flow condition and CHF studied.It draws a conclusion, ERVC can guarantee the realization of IVR.
Most representative test is the ULPU serial experiment that California, USA university carries out.It is intended to measure lower envelope
The critical heat flux density of head surface optimizes heat insulation layer structure.Test the examination using full-scale test circuit and piece cutting structure
Test section.ULPU pilot project includes the test in five stages altogether, wherein I, II, III test is directed to AP600 heap-type, IV, V
It is directed to AP1000 heap-type, the parameters such as structure and the import and export mix to insulating layer have carried out development test.ULPU test is also
The distribution of cooling CHF outside pressure vessel is clearly given, as shown in Fig. 1 .1.Fig. 1 .2 is the typical experimental provision of ULPU.
In addition, South Korea expands SBLB test also for its advanced heap-type APR1400, using scale reduction method, still
It is the ratio of the contracting to three-dimensional rack.Sandia labs CYBL test in the U.S. is external using the pressure vessel of 1:1 ratio
Portion's cooling procedure boiling heat transfer and flow process have carried out experimental study.
As it can be seen that it is all to simulate lower head using the model of 1:1 ratio that external research is most of, even taking slice module
Type is also full-scale simulation.The time expended in this way is more, and project amount is bigger.
Domestic aspect, Shanghai Communications University have also carried out the REPEC experiment of 1:1, it is advanced high-power to be directed to CPR1000
Heap-type, using two dimension slicing structure, the two dimension slicing structure of full-scale simulation pressure vessel.Test-bed such as Fig. 1 .3.Also
There are some projects calculated using software and tested using inclined heating wall imitation heating wall.
Therefore, it is desirable to there is stagnation pressure external container cooling test rack in a kind of fusant heap, in research, nuclear power plant is tight
In weight accident conditions, test section is respectively adopted under the conditions of two and three dimensions slicing experiment, and reactor core melts in lower head of pressure vessel
Beyond the region of objective existence portion IVR-ERVC Cooling Heat Transfer and flow behavior.Subscale test rack is built by proportion grading, is obtained under different operating conditions
The CHF distribution situation of two and three dimensions hierarchical model establishes the CHF prediction model for being suitable for lower head shape, by two peacekeepings three
The test result of dimension slice compares, and illustrates local heating surface current road three-dismensional effect and whole Natural Circulation runner three-dimensional effect
Influence of the benefit to IVR measure validity, the reliability for IVR-ERVC test provide theoretical and test basis.
Summary of the invention
The invention discloses stagnation pressure external container cooling test rack in a kind of fusant heap, three-dimensional slice experiments
In, heating flow channel wall surface surface area increases with the increase of height, in turn result in bubble nucleating point heating surface quantity,
Distribution mode etc. has certain difference with two dimension slicing experiment；Runner gradually broadens with short transverse, to the stream of fluid, bubble
Dynamic, the speed in flotation, mixed effect etc. have a certain impact, and then may influence the position of CHF appearance and different positions
Set the size of place's CHF value；Consider that large space central symmetry Natural Circulation runner is to whole Natural Circulation effect outside IVR simultaneously
It influences, comprehensively considers entirety and influence of the partial 3 d effect to CHF, compared with original two-dimentional experimental studies results.This
Invention is directed to specific heap-type, i.e. AP1000 heap-type.Certain theories integration can be provided for the research of specific heap-type.
Stagnation pressure external container cooling test rack in a kind of fusant heap, the experimental stand includes: two-dimentional test
Section, three dimensional taest section, the ascent stage, upper water box, flowmeter, descending branch, valve, lower header, heating system, system for detecting temperature,
Pre-heating system and cooling system；The two dimension test section top connects the bottom end of the ascent stage, and the top of the ascent stage connects
The side of the upper water box is connect, the bottom end of the upper water box connects the top of the flowmeter, the bottom end connection of the flowmeter
The bottom end on the top of the descending branch, the descending branch connects the valve, and the valve connects the top one of the lower header
Side, the top other side of the lower header connect the bottom end of the two-dimentional test section；The connection of three dimensional taest section top is another
The bottom end of a ascent stage, the top of another ascent stage connect the other side of the upper water box, the upper water box
Bottom end connects the top of another flowmeter, and the bottom end of another flowmeter connects the top of another descending branch
End, the bottom end of another descending branch connects another valve, another described valve is connected and is lauched described in another
The top side of case, the top other side of another lower header connect the bottom end of the three dimensional taest section；The two dimension examination
It tests in section and three dimensional taest section and is provided with heating system, for heating the two-dimentional test section and three dimensional taest section；The temperature
Degree detection system is arranged near upper water box outlet end and input end and the outlet of the two-dimentional test section and three dimensional taest section
Near end, to detect the temperature of corresponding position cooling water；The pre-heating system connects the upper water box with cooling system, for controlling
The temperature of cooling water in upper water box processed；The heat flow density of the two-dimentional test section and three dimensional taest section is controlled by heating system
Distribution, makes it substantially simulate the heat flux distribution under major accident, using system for detecting temperature measurement under this heat flow density
Temperature and cooling water temperature, obtain the rule of heat transfer coefficient；It is whole to increase heating power, until temperature is ascended to heaven,
Heat flow density at this time is critical heat flux density；By analyzing the CHF value of different zones, the lower envelope of lower two-dimentional test section is obtained
The CHF regularity of distribution under head two dimension slicing and the lower head three-dimensional slice curved surface heating condition of three dimensional taest section is established reliable
CHF prediction model.
Preferably, the two-dimentional test section and three dimensional taest section are made of U-shaped runner and several piece Heated Copper block, and described two
Dimension test section is the arc slice that width is 18.5CM, and the three dimensional taest section is the spherical slice that angle of release is 15 degree；It is described to add
Hot systems include heating rod, for heating the heating surface of the two-dimentional test section and three dimensional taest, provide nature for test-bed
The energy of circulation.
Preferably, the two-dimentional test section and three dimensional taest section respectively include 9 heating copper billets, to form corresponding heating
Face, each heating copper billet are evenly distributed with heating rod mounting hole, and the heating rod mounting hole can be used for installing heating rod, pass through tune
Heating rod power is saved to control heat flux distribution.
Preferably, the top of the ascent stage have multiple water inlets being connect with the upper water box, each water inlet and its
The vertical height of the corresponding two-dimentional test section or three dimensional taest section bottom is respectively 3.5M, 4.5M and 5.5M.
Preferably, the flow is calculated as ultrasonic flowmeter, is used to detect cooling water natural circulation flow, the valve
For controlling the flow of cooling water.
Preferably, the experimental stand is provided with 6 temperature points, is arranged in 2 near the upper water box outlet end
Tank outlet temperature point is arranged in the water inlet temperature point of the input end of two-dimentional test section, two-dimentional test section is arranged in
The outlet temperature measuring point of outlet end；The water inlet temperature point of the input end of three dimensional taest section is set, and setting is tried in three-dimensional
Test the outlet temperature measuring point of the outlet end of section.
Preferably, the preheater includes multiple heaters, and the upper water box is provided with 3 preheater mouths, each preheating
The heater of a 50KW is arranged in device mouth.
Preferably, it carries out starting 1 heater when the experiment of 3.5M height；Carry out 2 heating of starting when the experiment of 4.5M height
Device；It carries out starting 3 heaters when the experiment of 5.5M height.
Preferably, the cooling system includes plate heat exchanger, and 2 cooling system intake-outlets are arranged in the upper water box,
It is exchanged heat by plate heat exchanger to cooling water temperature, keeps the temperature of cooling water in upper water box constant.
The beneficial effect of stagnation pressure external container cooling test rack is this test-bed in fusant heap of the invention
It can obtain the interior wall temperature of the bringing-up section under different operating conditions, the fluid temperature (F.T.) of runner, a system such as test section pressure difference and void fraction
Column change over time parameter, while can change the value of constant parameter the influence of studying it to experimental result, for example, change plus
Thermal power and tank height study its influence degree to result.This has important meaning to the mechanism study of nuclear power plant's major accident
Justice.
Detailed description of the invention
Fig. 1 .1 is that prior art ULPU tests the lower head CHF distribution map measured.
Fig. 1 .2 is prior art ULPU experimental rig schematic diagram.
Fig. 1 .3 is the test loop prior art REPEC figure.
Fig. 2 is the schematic diagram of stagnation pressure external container cooling test rack in fusant heap of the invention.
Specific embodiment
To keep the purposes, technical schemes and advantages of the invention implemented clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label indicate same or similar element or element with the same or similar functions.Described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to use
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Stagnation pressure external container cooling test rack in a kind of fusant heap, the experimental stand includes: two-dimentional test
Section, three dimensional taest section, the ascent stage, upper water box, flowmeter, descending branch, valve, lower header, heating system, system for detecting temperature,
Pre-heating system and cooling system；The two dimension test section top connects the bottom end of the ascent stage, and the top of the ascent stage connects
The side of the upper water box is connect, the bottom end of the upper water box connects the top of the flowmeter, the bottom end connection of the flowmeter
The bottom end on the top of the descending branch, the descending branch connects the valve, and the valve connects the top one of the lower header
Side, the top other side of the lower header connect the bottom end of the two-dimentional test section；The connection of three dimensional taest section top is another
The bottom end of a ascent stage, the top of another ascent stage connect the other side of the upper water box, the upper water box
Bottom end connects the top of another flowmeter, and the bottom end of another flowmeter connects the top of another descending branch
End, the bottom end of another descending branch connects another valve, another described valve is connected and is lauched described in another
The top side of case, the top other side of another lower header connect the bottom end of the three dimensional taest section；The two dimension examination
It tests in section and three dimensional taest section and is provided with heating system, for heating the two-dimentional test section and three dimensional taest section；The temperature
Degree detection system is arranged near upper water box outlet end and input end and the outlet of the two-dimentional test section and three dimensional taest section
Near end, to detect the temperature of corresponding position cooling water；The pre-heating system connects the upper water box with cooling system, for controlling
The temperature of cooling water in upper water box processed；The heat flow density of the two-dimentional test section and three dimensional taest section is controlled by heating system
Distribution, makes it substantially simulate the heat flux distribution under major accident, using system for detecting temperature measurement under this heat flow density
Temperature and cooling water temperature, obtain the rule of heat transfer coefficient；It is whole to increase heating power, until temperature is ascended to heaven,
Heat flow density at this time is critical heat flux density；By analyzing the CHF value of different zones, the lower envelope of lower two-dimentional test section is obtained
The CHF regularity of distribution under head two dimension slicing and the lower head three-dimensional slice curved surface heating condition of three dimensional taest section is established reliable
CHF prediction model.
Preferably, the two-dimentional test section and three dimensional taest section are made of U-shaped runner and several piece Heated Copper block, and described two
Dimension test section is the arc slice that width is 18.5CM, and the three dimensional taest section is the spherical slice that angle of release is 15 degree；It is described to add
Hot systems include heating rod, for heating the heating surface of the two-dimentional test section and three dimensional taest, provide nature for test-bed
The energy of circulation.
Preferably, the two-dimentional test section and three dimensional taest section respectively include 9 heating copper billets, to form corresponding heating
Face, each heating copper billet are evenly distributed with heating rod mounting hole, and the heating rod mounting hole can be used for installing heating rod, pass through tune
Heating rod power is saved to control heat flux distribution.
Preferably, the top of the ascent stage have multiple water inlets being connect with the upper water box, each water inlet and its
The vertical height of the corresponding two-dimentional test section or three dimensional taest section bottom is respectively 3.5M, 4.5M and 5.5M.
Preferably, the flow is calculated as ultrasonic flowmeter, is used to detect cooling water natural circulation flow, the valve
For controlling the flow of cooling water.
Preferably, the experimental stand is provided with 6 temperature points, is arranged in 2 near the upper water box outlet end
Tank outlet temperature point is arranged in the water inlet temperature point of the input end of two-dimentional test section, two-dimentional test section is arranged in
The outlet temperature measuring point of outlet end；The water inlet temperature point of the input end of three dimensional taest section is set, and setting is tried in three-dimensional
Test the outlet temperature measuring point of the outlet end of section.
Preferably, the preheater includes multiple heaters, and the upper water box is provided with 3 preheater mouths, each preheating
The heater of a 50KW is arranged in device mouth.
Preferably, it carries out starting 1 heater when the experiment of 3.5M height；Carry out 2 heating of starting when the experiment of 4.5M height
Device；It carries out starting 3 heaters when the experiment of 5.5M height.
Preferably, the cooling system includes plate heat exchanger, and 2 cooling system intake-outlets are arranged in the upper water box,
It is exchanged heat by plate heat exchanger to cooling water temperature, keeps the temperature of cooling water in upper water box constant.
As shown in Fig. 2, this experimental system includes test section and system circuit and some auxiliary systems.Test section is divided into two
Test section and three dimensional taest section are tieed up, a part of advanced high-power presurized water reactor AP1000 lower head of pressure vessel is simulated.Heated Copper
Block and U-shaped runner constitute flow passage system, so that fluid is flowed through in heating copper billet outer wall.It heats U-shaped runner and the ascent stage is method
Orchid connection.System circuit includes lower header, test section, ascent stage, upper water box and descending branch.Open-ended on water tank, side are provided with
Entery and delivery port is upper water box heat exchange for cooling system.Water tank is connect with cooling system by pipeline, and the water temperature in water tank is protected
It holds in lower state.Auxiliary system mainly includes signal acquiring system, cooling system etc..
A natural convection loop is formed in experimentation.Fluid quilt in the state of being full of cooling water, in U-shaped runner
Heating enters upper tank along the ascent stage after being heated, and the low-temperature cooling water in water tank passes through descending branch and lower header again
It is supplemented in U-shaped runner, descending branch is equipped with flowmeter, monitors flow at any time.The size of the adjustable flow of descending branch valve.
The size of test-bed is determined using power-volume ratio analysis method, guarantees scale model and reactor prototype
Important dimensionless crack length it is similar.To lower head of pressure vessel, by 1:2 contracting ratio, the two dimension slicing and three-dimensional for removing end socket are cut
Piece is analyzed.The outside wall surface of lower head model is heated by the way of being inserted into heating rod in heating copper billet.For simulation
Heat flux distribution caused by layering of the reactor core fusant in lower head is uneven, and heating surface is divided into 9 along inclination direction
Region, the heating power and heat flow density in each region are different, heating power independent control and adjustable.Using the upper of a high position
Drive ram of the water tank as Natural Circulation, after the cooling water boiling of lower head outside wall surface, by between wall surface and U-shaped runner
Space flows upwardly into upper water box top, and the relatively low cooling water of the temperature of upper water box lower part enters lower header along decline runner,
Test section inlet is returned, Natural Circulation is formed.
Experimental study is carried out to the two-phase boiling heat transfer characteristic of lower head cooling water, pays close attention to lower head outside wall surface
The CHF regularity of distribution.The heat flow density for adjusting separately test section each section heating plate makes it substantially simulate lower head under major accident
Heat flux distribution, measurement under this heat flow density the cooling water temperature of the temperature of heating surface wall surface and runner, passed
The rule of hot coefficient.Whole to increase heating power, until certain point wall surface temperature is ascended to heaven, heat flow density at this time is to face
Boundary's heat flow density.By the CHF value of different zones on analysis heating surface, obtains lower head two dimension slicing and three-dimensional slice curved surface adds
The CHF regularity of distribution under heat condition establishes reliable CHF prediction model.
In terms of passive natural circulation flow behavior, establish before stable Natural Circulation is IVR-ERVC validity
It mentions.Natural circulation cooling water flow is also to determine one of the key factor of CHF.The quasi- measurement different heating power of experiment and degree of supercooling
Under circulating cooling water flow, obtain Natural Circulation and establish the minimum discharge at initial stage, as the conservative value of IVR-ERVC design, separately
Outside, the variation that upper water box height is had also contemplated in the building course of test-bed passes through the flanged joint between each segment pipe
The circulation height change of 3.5m, 4.5m and 5.5m can be achieved.
Experimental stand is divided into heating system, flow passage system, system for detecting temperature, pre-heating system and cooling system.
Heating system provides the energy of Natural Circulation for entire rack.Heating rod is inserted into heating copper billet, adjusting is passed through
The power of heating rod, to adjust the heat flux of heating copper billet.Test section is divided into three-dimensional bringing-up section and two-dimentional bringing-up section, three-dimensional heating
Section is 15 ° of spherical slices of angle of release, and the arc that two-dimentional bringing-up section is width 18.5cm is sliced.
Cooling water is circulated in rack by flow passage system, and the running track of cooling water is lower header --- test section ---
Ascent stage --- upper water box --- descending branch --- lower header.The head and tail portion of test section pass through flanged joint and pipeline phase
Even.Three water inlets that ascent stage is connected with upper water box, respectively with the vertical drop of test section bottom be 3.5M, 4.5M,
5.5M.Ultrasonic flowmeter and valve are distributed in descending branch, for detecting natural circulation flow and control flow.
System for detecting temperature, rack are set there are six temperature point, are located at the inlet and outlet and tank outlet of test section.Examination
The measuring point for testing section inlet and outlet water temperature is mostly important, for guaranteeing that degree of supercooling meets requirement of experiment.Measuring point at tank outlet is used for
The operation power of cooling system in adjustment water tank in time, guarantees that outlet temperature meets requirement of experiment.
Pre-heating system is used for before experiment starts, and the cooling water in rack is heated to predetermined temperature, this experimental bench is set up
Three preheater mouths have been counted, placed the heater of a 50KW in each preheater mouth.When doing the experiment of 3.5M height, only
Enable nethermost heater, the total 50KW of warm-up power；When doing the experiment of 4.5M height, following two heater, preheating are enabled
The total 100KW of power；When doing the experiment of 5.5M height, whole heaters, the total 150KW of warm-up power are enabled.It is cold in experimental stand
But after water temperature meets requirement of experiment, heater is closed, starts to test.
Cooling system is in real time in an experiment the cooling water temperature in upper water box, because in an experiment, test section heats copper billet
It is heated to cooling water always, and requirement of experiment test section inlet water temperature is stablized, so cooling system need to be added in upper water box,
For cooling water temperature.The cooling water of the heat of upper water box enters plate heat exchanger by cooling system water outlet and exchanges heat, and cools down
Upper water box is entered by cooling system water inlet afterwards, it is real by tank outlet temperature point by the cooling water temperature in upper water box
When observed temperature, change heat exchange power, to realize that coolant water temperature is constant.
Steps are as follows for specific experiment:
Cooling water is full of in circuit, it is ensured that loop seals are good；
Power supply is opened, adjustment bringing-up section power substantially conforms to the CHF regularity of distribution figure provided, obtains under this heat flow density
Minimum discharge under one Natural Circulation.
It is got in step 2 minimum discharge by flow set, heating power is identical with step 2, first by bringing-up section entrance
The degree of supercooling of cooling water is maintained at a lower value；
NI data collection system is opened, system has been separately connected 238 wall temperature thermocouples in heating plate and (has surveyed bringing-up section wall
Temperature) and two runners in inlet and outlet four armoured thermocouples (coolant water temperature in measurement flow channel), observe each measuring point
Temperature change, while recording the numerical value on differential pressure pickup, observe the situation of change of test section pressure difference.
Increase the degree of supercooling of cooling water, observes data variation.If wall temperature increases suddenly at a certain moment during observing test
Greatly, power supply is closed immediately, is stopped heating, is prevented from burning bringing-up section, the heat flow density for occurring wall temperature step point moment at this time is
The critical heat flux density value of this point.
The heat flow density for according to circumstances changing each section of heating surface respectively, keeps other conditions constant, respectively obtains a heating
The heat flow density of section, obtains the CHF regularity of distribution in the case of different entrance degree of supercoolings.
Change Natural Circulation height in the case where power and flow are constant, record similar with the case where changing degree of supercooling
The variation of the parameters such as water temperature, test section pressure difference under difference circulation height, while high-speed camera observation gas-liquid two can be used
The mutually variation of stream, and obtain the CHF regularity of distribution of lower head outside wall surface under different circulation height.
After the completion of experiment, power supply is closed in time, it, will be cold in circuit when hot arc temperature to be added is cooled to a certain lower temperature
But water is discharged.
Finally it is noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, the essence for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution
Mind and range.
Claims (9)
1. stagnation pressure external container cooling test rack in a kind of fusant heap, it is characterised in that the experimental stand includes:
Two-dimentional test section, three dimensional taest section, ascent stage, upper water box, flowmeter, descending branch, valve, lower header, heating system, temperature inspection
Examining system, pre-heating system and cooling system；The two dimension test section top connects the bottom end of the ascent stage, the ascent stage
Top connects the side of the upper water box, and the bottom end of the upper water box connects the top of the flowmeter, the bottom of the flowmeter
End connects the top of the descending branch, and the bottom end of the descending branch connects the valve, and the valve connects the lower header
Top side, the top other side of the lower header connect the bottom end of the two-dimentional test section；Three dimensional taest section top connects
Connect the bottom end of another ascent stage, the top of another ascent stage connects the other side of the upper water box, it is described on
The bottom end of water tank connects the top of another flowmeter, and the bottom end of another flowmeter connects another decline
The top of section, the bottom end of another descending branch connect another valve, another described valve connects another institute
The top side of lower header is stated, the top other side of another lower header connects the bottom end of the three dimensional taest section；It is described
It is provided with heating system in two-dimentional test section and three dimensional taest section, for heating the two-dimentional test section and three dimensional taest section；
The system for detecting temperature is arranged near upper water box outlet end and the input end of the two-dimentional test section and three dimensional taest section
Near outlet end, to detect the temperature of corresponding position cooling water；The pre-heating system connects the upper water box with cooling system,
For controlling the temperature of the cooling water in upper water box；The heat of the two-dimentional test section and three dimensional taest section is controlled by heating system
Current density distribution, makes it substantially simulate the heat flux distribution under major accident, is measured using system for detecting temperature in this hot-fluid
The temperature of temperature and cooling water under density, obtains the rule of heat transfer coefficient；It is whole to increase heating power, until temperature occurs
It ascends to heaven, heat flow density at this time is critical heat flux density；By analyzing the CHF value of different zones, lower two-dimentional test section is obtained
Lower head two dimension slicing and three dimensional taest section lower head three-dimensional slice curved surface heating condition under the CHF regularity of distribution, establish
Reliable CHF prediction model.
2. stagnation pressure external container cooling test rack in fusant heap according to claim 1, it is characterised in that: described
Two-dimentional test section and three dimensional taest section are made of U-shaped runner and several piece Heated Copper block, and the two dimension test section is that width is
The arc of 18.5CM is sliced, and the three dimensional taest section is the spherical slice that angle of release is 15 degree；The heating system includes heating rod,
For heating the heating surface of the two-dimentional test section and three dimensional taest, the energy of Natural Circulation is provided for test-bed.
3. stagnation pressure external container cooling test rack in fusant heap according to claim 2, it is characterised in that: described
Two-dimentional test section and three dimensional taest section respectively include 9 heating copper billets, and to form corresponding heating surface, each heating copper billet uniformly divides
It is furnished with heating rod mounting hole, the heating rod mounting hole can be used for installing heating rod, control heat by adjusting heating rod power
Current density distribution.
4. stagnation pressure external container cooling test rack in fusant heap according to claim 3, it is characterised in that: described
The top of ascent stage has multiple water inlets connecting with the upper water box, the corresponding two-dimentional test section of each water inlet
Or the vertical height of three dimensional taest section bottom is respectively 3.5M, 4.5M and 5.5M.
5. stagnation pressure external container cooling test rack in fusant heap according to claim 4, it is characterised in that: described
Flow is calculated as ultrasonic flowmeter, is used to detect cooling water natural circulation flow, and the valve is used to control the stream of cooling water
Amount.
6. stagnation pressure external container cooling test rack in fusant heap according to claim 5, it is characterised in that: described
Experimental stand is provided with 6 temperature points, and 2 tank outlet temperature points near the upper water box outlet end are arranged in, if
The water inlet temperature point in the input end of two-dimentional test section is set, the outlet temperature that the outlet end of two-dimentional test section is arranged in is surveyed
Point；The water inlet temperature point of the input end of three dimensional taest section is set, the water outlet of the outlet end of three dimensional taest section is set
Temperature point.
7. stagnation pressure external container cooling test rack in fusant heap according to claim 6, it is characterised in that: described
Preheater includes multiple heaters, and the upper water box is provided with 3 preheater mouths, and adding for a 50KW is arranged in each preheater mouth
Hot device.
8. stagnation pressure external container cooling test rack in fusant heap according to claim 7, it is characterised in that: carry out
Start 1 heater when 3.5M height is tested；It carries out starting 2 heaters when the experiment of 4.5M height；Carry out the experiment of 5.5M height
3 heaters of Shi Qidong.
9. stagnation pressure external container cooling test rack in fusant heap according to claim 8, it is characterised in that: described
Cooling system includes plate heat exchanger, and 2 cooling system intake-outlets are arranged in the upper water box, is changed by plate heat exchanger
Heat keeps the temperature of cooling water in upper water box constant cooling water temperature.
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