CN105911087A - Large nuclear reactor molten pool natural-convection heat transfer test system and method - Google Patents
Large nuclear reactor molten pool natural-convection heat transfer test system and method Download PDFInfo
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- CN105911087A CN105911087A CN201610383014.5A CN201610383014A CN105911087A CN 105911087 A CN105911087 A CN 105911087A CN 201610383014 A CN201610383014 A CN 201610383014A CN 105911087 A CN105911087 A CN 105911087A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a large nuclear reactor molten pool natural-convection heat transfer test system and method. The system comprises a large molten pool natural-convection heat transfer test piece, a molten salt heating furnace supplying high temperature melt, a nitrogen source connected to the test piece and the molten salt furnace, and a cooling water loop. The test system also includes supporting power distribution equipment, instrument control equipment and data measurement and acquisition equipment. In the cooling water loop, a centrifugal water pump drives water in a cooling water tank to take away a decay heat source through a cooling channel of the test piece, heated cooling water restores to an initial water temperature through a plate heat exchanger and a cooling tower and then returns to the cooling water tank. When the molten pool temperature reaches a steady state, the test ends, and the waste liquid in the test piece is discharged into a waste liquid pool. The invention also provides a test method. By means of the large nuclear reactor molten pool natural-convection heat transfer test, molten pool heat transfer data under a reactor serious accident condition can be acquired for safety design.
Description
Technical field
The present invention relates to the fusion pool heat transfer free convection characteristic under the conditions of reactor disaster
Studying technological domain, is specifically related to a kind of large-scale nuclear reactor fusion pool heat transfer free convection test
System and method.
Background technology
If nuclear power plant's reactor core occur to can not get under severe accident conditions enough cold
But, the continuous accumulation of decay heat can cause reactor core steep temperature rise to melt, the reactor core after fusing
Fused mass migrates gradually downward, and burn through gripper shoe forms fragment bed fusion pool in dropping to low head
Structure.Corresponding to the extreme condition of Whole core fusing, the fusion pool in low head is at endogenous pyrogen
The lower free convection that high Rayleigh number occurs of effect, downward header wall transmission heat.If lower envelope
The forcing functions of head outside wall surface can not take away the decay heat that fusion pool transmission comes, low head wall
Can gradually heat up and high-temerature creep occur until burn through lost efficacy, cause a large amount of radioactive substance to leak.
The heat transfer phenomenon such as the thermally stratified layer occurred in fusion pool and Natural Circulation directly determine pressure
The thermic load of container wall, this realizes pressure vessel integrity to a great extent to success
Play vital effect.Therefore, special by carrying out large-scale fusion pool heat transfer free convection
Property experimental study, it may be determined that the fusion pool distribution to pressure vessel wall fever sensation of the face load, to pressure
Vessel Design safety analysis has great importance.
For fusion pool heat transfer free convection characteristic, different tests use different tests design,
Different fused mass analogies, different boundary conditions, therefore have also been obtained different test knots
Really.Rayleigh number is as the key parameter of heat convection problem, special to the heat convection in fusion pool
Property has important impact.Can the selection of fused mass material be to determine truly to melt by accurate simulation
The key factor of thing heat transfer process.Owing to directly using leiomyoma cells to carry out fusion pool heat transfer characteristic
The cost of test is the highest, and EXPERIMENTAL DESIGN also wants complicated many simultaneously, therefore the most opens at present
The fusion pool heat transfer characteristic test of exhibition all uses substitution material to carry out.Selected material should
It is non-eutectic mixture, and there is obvious solidus temperature and liquidus temperature is poor, have
The coagulating property similar to reactor core oxidation fusion thing, should not produce corrosion to Stainless steel pressure vessels
And destruction, owing to existing in the selection of technical operation and fused mass heating system and heating furnace
One definite limitation, the temperature of fused mass should be more than 1000 DEG C.
Such as, document (Theofanous TG, Maguire M, Angelini S, et al.The first
results from the ACOPO experiment[J].Nuclear Engineering and Design,
1997,169 (1-3): 49-57) and document (Asfia FJ, Dhir VK.An experimental
study of natural convection in a volumetrically heated spherical pool
bounded on top with a rigid wall[J].Nuclear Engineering and Design,
1996,163 (3): 333-348) fusion pool heat transfer experiments loop disclosed in, test is respectively adopted
Water and freon are as fused mass analogies, and low head outside wall surface water at low temperature is as coolant.
But both pilot systems are unable to carry out high temperature melting melt pool heat transfer free convection characteristic
Research, it is impossible to reflect the coagulating property of true fused mass high temperature eutectic feature.
The most such as, document (Gaus-Liu X, Mjasoedov A, Cron T, et al.Test and
Simulation Results of LIVE-L4+LIVE-L5L[M].KIT Scientific
Publishing, 2011) disclose a kind of fusion pool heat transfer experiments loop, use high temperature NaNO3
And KNO3Binary mixture as the substitution material of fused mass in actual response heap, use water
As coolant.But due to test section small volume, fusion pool Rayleigh number is compared to reactor
Magnitude is less than normal, and molten salt furnace employing is toppled over mode and poured in testpieces by high-temperature molten salt, this kind of mode
Certain danger is possessed in the hot test carrying out large scale magnitude, and infeasible.
Summary of the invention
For the problem overcoming above-mentioned prior art to exist, it is an object of the invention to provide one
Large-scale nuclear reactor fusion pool heat transfer free convection pilot system and method, carry out large-scale nuclear reaction
Heap fusion pool heat transfer free convection is tested, it is thus achieved that the fusion pool under the conditions of reactor disaster is changed
Dsc data.
In order to achieve the above object, the present invention adopts the following technical scheme that
A kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system, anti-including large-scale core
Answering heap fusion pool heat transfer free convection testpieces 1, testpieces 1 includes internal heating system and cold
But passage, installs the first thermocouple 101 in testpieces 1 and the first Pressure gauge 111 is used for supervising
Survey the temperature and pressure change in testpieces 1；The fused salt heating furnace 2 of high-temperature molten leads to successively
Cross high-temperature molten salt submerged pump the 501, first high-temperature ball valve 901 and corresponding fused salt pipeline and testpieces
1 is connected, and pipeline is installed the second thermocouple 102 and high-temperature electromagnetic effusion meter 121 for measuring
Temperature of molten salt at testpieces 1 fused salt inlet and flow；Mend when using fused salt to make fused mass
Inflated with nitrogen carries out high-temp antioxidizing protection, and source nitrogen 3 is respectively by the first nitrogen air relief valve 902
With the second nitrogen air relief valve 903 and corresponding nitrogen pipeline and testpieces 1 and fused salt heating furnace 2
It is connected, pipeline is respectively mounted the first vortex-shedding meter 122 and the second vortex-shedding meter 123,
For measuring nitrogen flow；Waste liquid pool 13 by fused salt pipeline and the second high-temperature ball valve 911 with
The sewage draining exit of testpieces 1 is connected, and discharges the fused salt in testpieces 1 after off-test；At fused salt
It is wound around heater strip outside inlet pipeline and blow-off line before and after test, fused salt pipeline to be preheated；
In chilled(cooling) water return (CWR), cooling water tank 4 passes sequentially through first ball valve the 904, first filter
601, the first centrifugal pump 502 connects with the lower water inlet of corresponding pipeline with testpieces 1；Water
Second thermometer 104 is installed on case, is used for monitoring water temperature change in water tank；First centrifugal pump 502
Downstream line on have a threeway, the vertical branch of threeway pass through pipeline and the second ball valve 905
It is communicated to cooling water tank 4 and constitutes a bypass circulation, for assisting the flow of regulation cooling water；
The downstream line of threeway is installed the 3rd Pressure gauge the 113, first electromagnetic flowmeter 124 successively
Pipeline pressure, cooling water flow and inlet temperature is obtained respectively with three thermocouple 105；
The cooling water heated by testpieces 1 is extensive through the cooling of plate type heat exchanger 7 and cooling tower 8
Cooling water tank 4 is returned after arriving initial water temperature again；At the primary side water inlet of plate type heat exchanger 7,
It is connected, at pipeline with the coolant outlet on testpieces 1 top by pipeline and the 3rd ball valve 906
Upper installation the 4th thermocouple 106 obtains cooling water outlet temperature；At plate type heat exchanger 7 once
Side outlet, is connected with cooling water tank 4 by pipeline and the 4th ball valve 907, forms primary side
Closed-loop path；The secondary side water (flow) direction of plate type heat exchanger 7 and primary side flow to be adverse current, two
Secondary side outlet passes sequentially through the 5th ball valve 908 and the second electromagnetic flowmeter 125 is connected to cooling
The water inlet of tower 8；The outlet of cooling tower 8 pass sequentially through the second filter 602, second from
Heart pump the 503, the 6th ball valve 909 and corresponding pipeline and plate type heat exchanger 7 secondary side water inlet phase
Even, secondary side closed-loop path is formed；Secondary circuit pipeline is installed the 5th thermocouple 107, the
Two electromagnetic flowmeters 125 and the 4th Pressure gauge 114 obtain secondary circuit cooling water temperature, stream respectively
Amount and pipeline pressure；A threeway, threeway is had in the downstream line of this external 3rd ball valve 906
Vertical branch be connected to the 4th ball valve 907 upstream composition one by pipeline and the 7th ball valve 910
Individual bypass circulation, for assisting the flow of regulation cooling water；
Pilot system also includes that supporting controller switching equipment 14, I &C equipment 15 and DATA REASONING is adopted
Collection equipment 16.
Described fused salt heating furnace 2 uses Electric heating to be heated by fused mass analogies nitrate
It is melted to 350 DEG C of molten states, is then injected into testpieces 1 by high-temperature molten salt submerged pump 501
In；The first thermometer 103 on fused salt heating furnace 2 and the second Pressure gauge 112 are used for monitoring molten
Temperature and pressure change in salt heating furnace 2.
The valve of described cooling water system design many places and bypass line, conveniently carry out discharge
Regulation, it is ensured that the temperature of the cooling water inlet temperature measurement three thermocouple 105 at testpieces 1
Keep constant, reduce the cooling water temperature fluctuation impact on fusion pool heat transfer characteristic.
The hot test part 1 of described pilot system, fused salt heating furnace 2 and the import and export of fused mass
Pipe surface is all coated with heat-insulation layer；Described heat-insulation layer includes the silicate aluminum board fixing with thin wire
Clad, is wrapped in outside the glass wool cloth outside silicate aluminum board clad, and sticking glass silk cloth
Aluminium-foil paper；The average thickness of clad is more than 150mm.
Described controller switching equipment 14 mainly includes that the power distribution cabinet being sequentially connected with, power transmission line and electricity consumption set
Standby, power supply source capacity meets the need for electricity that pilot system is whole；Described I &C equipment 15 is main
The display instrument at each position, test loop to be included, molten salt furnace start and control platform, pump for liquid salts
Centrifugal pump starts and controls platform and heating system startup control platform；Described DATA REASONING and collection
Equipment 16 mainly include thermocouple, effusion meter and pressure transducer, rosette, capture card,
Measurement module, signal conditioner, the drive software of computer and data acquisition software.
A kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system described above
Test method, before on-test, needs in advance fused salt heating is melted to temperature required and is incubated；
Open successively DATA REASONING and acquisition system 16, the preheating of fused salt pipeline, the first centrifugal pump 502,
Second centrifugal pump 503 and the inside heating system of testpieces 1, reinject fused salt afterwards and start
Test；The heat produced when the cooling heat taken away of water and testpieces 1 heating rod balances each other, and melts
No longer there is significant change in melt pool temperature, heat transfer experiments reaches stable state, then switches heating power
Or terminate test；In high-temperature molten salt stove 2 heating process and testpieces 1 process of the test, all
Need source nitrogen 3 to supplement nitrogen and carry out air exclusion；Need before off-test first to fused salt blowdown
Pipeline preheats, then opens the second high-temperature ball valve 911 and be drained into by the waste liquid in testpieces 1
In waste liquid pool 13, it is then shut off the inside heating system of testpieces 1；Testpieces 1 needs to continue
Continuous carry out cooling down until temperature is down to less than 100 DEG C can close the first centrifugal pump 502 and the
Two centrifugal pumps 503.
The most relatively, the present invention possesses following advantage:
One of the present invention large-scale nuclear reactor fusion pool heat transfer free convection pilot system
And method, be for PWR nuclear power plant reactor disaster under the conditions of low head in melted
The feature of pond heat transfer free convection and the pilot system invented, the pilot system of the present invention uses height
Temperature fused mass carries out test, it is possible to realize the high Rayleigh number condition of reactor magnitude, result of the test
Can being applied in engineering reality of relatively limits；
One of the present invention large-scale nuclear reactor fusion pool heat transfer free convection pilot system
And method, use high-temperature molten salt stove to prepare the molten state nitrate of 350 DEG C as actual response heap
The substitution material of fused mass, as far as possible with the leiomyoma cells behavior phase of fused mass in actual response heap
Closely.Fused salt is injected to testpieces, it is ensured that safety is not deposited by high-temperature molten salt submerged pump
Problem at fused salt blocking pipeline.
One of the present invention large-scale nuclear reactor fusion pool heat transfer free convection pilot system
And method, cooling water system can take away examination by cooling water tank, plate type heat exchanger and cooling tower
Test the decay heat in part, until fusion pool reaches stable state.Cooling water tank and plate type heat exchanger are all provided with
It is equipped with bypass line, conveniently carries out Flow-rate adjustment, it is ensured that testpieces inlet water temperature is stable, reduce
Impact on fusion pool heat transfer characteristic.
Accompanying drawing explanation
Fig. 1 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system of the present invention
Schematic diagram.
Fig. 2 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system of the present invention
Function structure chart.
Fig. 3 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system of the present invention
Controller switching equipment schematic diagram.
Fig. 4 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system of the present invention
I &C equipment schematic diagram.
Fig. 5 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system of the present invention
DATA REASONING and collecting device schematic diagram.
Detailed description of the invention
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings:
As depicted in figs. 1 and 2, the present invention is a kind of large-scale nuclear reactor fusion pool free convection
Heat transfer experiments system and method, described pilot system includes that large-scale nuclear reactor fusion pool is the most right
Stream heat transfer experiments part 1, it is provided that the fused salt heating furnace 2 of high-temperature molten, with testpieces and fused salt
The source nitrogen 3 that stove connects, and cooling water system；First centrifugal pump 502 drives cooling water tank
Water in 4 takes away decay thermal source, heated cooling water warp by the cooling duct of testpieces 1
Cross after the cooling of plate type heat exchanger 7 and cooling tower 8 returns to initial water temperature and return cooling water tank
4；Until fusion pool temperature reaches off-test during stable state, the waste liquid in testpieces 1 is entered
To waste liquid pool 13；Pilot system also includes supporting controller switching equipment 14, I &C equipment 15 sum
According to measuring collecting device 16.
Described large-scale nuclear reactor fusion pool heat transfer free convection testpieces 1 includes internal heating
System and cooling duct, install the first thermocouple 101 and the first Pressure gauge in testpieces 1
The 111 temperature and pressure changes in monitoring test part 1.The fused salt of described high-temperature molten
Heating furnace 2 passes sequentially through high-temperature molten salt submerged pump the 501, first high-temperature ball valve 901 and melts accordingly
Salt pipeline is connected with testpieces 1, and pipeline is installed the second thermocouple 102 and high-temperature electromagnetic flow
Meter 121 is used for the temperature of molten salt at experiment with measuring part 1 fused salt inlet and flow.Molten using
Salt is made to supplement nitrogen during fused mass and is carried out high-temp antioxidizing protection, and source nitrogen 3 is respectively by first
Nitrogen air relief valve 902 and the second nitrogen air relief valve 903 and corresponding nitrogen pipeline and testpieces 1
Being connected with fused salt heating furnace 2, on pipeline, the first vortex-shedding meter 122 and the second whirlpool is installed by branch
Street effusion meter 123 is used for measuring nitrogen flow.
In chilled(cooling) water return (CWR), cooling water tank 4 passes sequentially through first ball valve the 904, first filter
601, the first centrifugal pump 502 connects with the lower water inlet of corresponding pipeline with testpieces 1, water
The water temperature change in monitoring water tank of second thermometer 104 is installed on case.First centrifugal pump 502
Downstream line on have a threeway, the vertical branch of threeway pass through pipeline and the second ball valve 905
It is communicated to cooling water tank 4 and constitutes a bypass circulation, for assisting the flow of regulation cooling water；
The downstream line of threeway is installed the 3rd Pressure gauge the 113, first electromagnetic flowmeter 124 successively
Pipeline pressure, cooling water flow and inlet temperature is obtained respectively with three thermocouple 105.Tested
The cooling water testing part 1 heating returns to initially through the cooling of plate type heat exchanger 7 and cooling tower 8
Cooling water tank 4 is returned after water temperature.At the primary side water inlet of plate type heat exchanger 7, by pipe
Road and the 3rd ball valve 906 are connected with the coolant outlet on testpieces 1 top, install on pipeline
4th thermocouple 106 obtains cooling water outlet temperature；Primary side water outlet at plate type heat exchanger 7
Mouthful, it is connected with cooling water tank 4 by pipeline and the 4th ball valve 907, forms primary side and close back
Road.The secondary side water (flow) direction of plate type heat exchanger 7 and primary side flow to as countercurrently, and secondary side goes out
The mouth of a river passes sequentially through the 5th ball valve 908 and the second electromagnetic flowmeter 125 is connected to cooling tower 8
Water inlet；The outlet of cooling tower 8 pass sequentially through second filter the 602, second centrifugal pump 503,
6th ball valve 909 is connected with plate type heat exchanger 7 secondary side water inlet with corresponding pipeline, forms two
Closed-loop path, secondary side.Secondary circuit pipeline is installed the 5th thermocouple the 107, second Electromagnetic Flow
Meter 125 and the 4th Pressure gauge 114 obtain secondary circuit cooling water temperature, flow and pipeline pressure respectively
Power.A threeway is had, the vertical branch of threeway in the downstream line of this external 3rd ball valve 906
It is connected to the 4th ball valve 907 upstream composition one by pipeline and the 7th ball valve 910 bypass back
Road, for assisting the flow of regulation cooling water.
As the preferred embodiment of the present invention, the described cooling water system design valve of many places
And bypass line, conveniently carry out discharge regulation, it is ensured that the cooling water inlet water at testpieces 1
The temperature of temperature measurement three thermocouple 105 keeps constant, reduces cooling water temperature fluctuation to melted
The impact of pond heat transfer characteristic.
As the preferred embodiment of the present invention, the hot test part of described pilot system, fused salt
The import and export pipe surface of stove and fused mass is all coated with heat-insulation layer.Described heat-insulation layer includes with thin
The silicate aluminum board clad that iron wire is fixing, is wrapped in the glass wool cloth outside silicate aluminum board clad,
And the aluminium-foil paper outside sticking glass silk cloth.The effect of thin wire is fixing and compresses aluminium silicate
Plate, the effect of glass wool cloth is to reduce contacting of people and silicate aluminum board, and the effect of aluminium-foil paper is viscous
Patch glass wool cloth further coating alumina silicate plate the tidiness at lifting test scene.This test is
The maximum temperature of system can reach 350 DEG C, and silicate aluminum board coating thickness should be greater than 150mm.
Heater strip it is wound around pre-to pipeline before and after test outside fused salt inlet pipeline and blow-off line
Heat, heater strip is coated in heat-preservation cotton.
As it is shown on figure 3, as the preferred embodiment of the present invention, described controller switching equipment 14 is main
Including the power distribution cabinet being sequentially connected with, power transmission line and electrical equipment.The power supply of controller switching equipment 14
Source capacity meets pilot system demand, provides the heating power supply of heating rod, fused salt for pilot system
The heating power supply of the pre-heated filament of the heating power supply of stove, pipeline, fused salt submerged pump and the power of centrifugal pump
The working power of power supply, I &C equipment and data acquisition equipment, the working power etc. of luminaire.
As shown in Figure 4, as the preferred embodiment of the present invention, described I &C equipment 15 is main
The display instrument at each position, test loop to be included, molten salt furnace start and control platform, pump for liquid salts
Centrifugal pump starts and controls platform and heating system startup control platform, and concrete parts include pressure regulation
Device, thermometer, Pressure gauge, effusion meter and valve positioner.Electrical heating is adjusted by pressure regulator
Power, shows fusion pool and the state of cooling water by thermometer and Pressure gauge, passes through effusion meter
Display fused salt, nitrogen and the flow of cooling water, adjust valve opening by valve positioner.
As it is shown in figure 5, described DATA REASONING and collecting device 16 mainly include thermocouple, stream
Gauge and pressure transducer, rosette, capture card, measurement module, signal conditioner, calculating
The drive software of machine and data acquisition software.Thermocouple, effusion meter and pressure transducer are by physics
Parameter is converted into the signal of telecommunication, through rosette, is transferred to signal conditioner and carries out filtration and adjust,
Digital signal is converted electrical signals into, it is provided that to computer by measurement module and data collecting card
Drive software and data acquisition software, the dedicated program then compiled by LabView is to all biographies
The signal of sensor processs and displays.
The present invention large-scale nuclear reactor fusion pool heat transfer free convection test method, concrete test
Operating process is as follows: nitrate is heated melting and heat preservation at 350 DEG C by fused salt heating furnace 2, fused salt
Liquid level reaches charge door position, opens nitrogen protection, open under high temperature melting saline solution in heating process
The cooling of the motor of pump 501.In actual heating process, need gradually to feed to molten salt furnace, treat
Solid salt fusing volume adds virgin material after reducing.Further, since heat transfer efficiency is the highest, heat up
Initial stage first takes small-power, steps up power, it is to avoid heating rod central temperature is too high.
In molten salt furnace heating process and process of the test, should ensure that enough nitrogen supply (NS)s, can select many
Individual nitrogen cylinder is combined and is carried out nitrogen supply (NS), uses the first nitrogen air relief valve 902 and the second nitrogen to subtract
Pressure valve 903 controls nitrogen flow.Turn-on data is measured and is started to record number with acquisition system 16
According to；After fused salt prepares, check valvular opening and closing, open the first centrifugal pump 502 and the
Two centrifugal pumps 503, operating chilled(cooling) water return (CWR) reaches stable state, until it is constant to import and export water temperature；Open
Open the preheating of fused salt feeding tube until 250 DEG C；Regulation pressure regulator, opens the heating of testpieces 1
System, to power demand, opens the nitrogen protection of test section；Open high-temperature molten salt submerged pump 501,
Fused salt is injected to testpieces 1, the fusion pool variations in temperature that monitoring and acquisition system shows, work as fused salt
Fused salt submerged pump 501 and preheating heater strip is closed after arriving specified altitude assignment；Real-time Monitoring Data is adopted
Collection, adjusts heating power and cooling water flow until system reaches stable state；Switching heating power is extremely
Next operating mode, adjusts cooling water flow until stable state；Described blow-off line starting point is connected to test
Bottom part 1, outlet is passed directly into waste liquid pool 13, before off-test, opens blow-off line pre-
Heat, to 250 DEG C, opens blowdown the second high-temperature ball valve 911, and in testpieces 1, fused salt relies on gravity
Effect is directly discharged into waste liquid pool 13；Close the heating system of testpieces 1 afterwards, but test
Part 1 needs to proceed cooling, and until temperature is down to less than 100 DEG C, just can to close first centrifugal
Pump 502 and the second centrifugal pump 503.
Claims (6)
1. one kind large-scale nuclear reactor fusion pool heat transfer free convection pilot system, it is characterised in that: include big
Type fusion pool heat transfer free convection testpieces (1), testpieces (1) includes internal heating system and cooling duct,
First thermocouple (101) and the first Pressure gauge (111) are installed in testpieces (1), for monitoring test
Temperature and pressure change in part (1)；The fused salt heating furnace (2) of high-temperature molten passes sequentially through high temperature melting
Salt submerged pump (501), the first high-temperature ball valve (901) are connected with testpieces (1) with corresponding fused salt pipeline,
Second thermocouple (102) and high-temperature electromagnetic effusion meter (121) are installed, for experiment with measuring part (1) on pipeline
Temperature of molten salt at fused salt inlet and flow；Use fused salt make fused mass time supplement nitrogen carry out high temperature prevent
Oxidation protection, source nitrogen (3) is respectively by the first nitrogen air relief valve (902) and the second nitrogen air relief valve (903)
And corresponding nitrogen pipeline is connected with testpieces (1) and fused salt heating furnace (2), pipeline is respectively mounted the
One vortex-shedding meter (122) and the second vortex-shedding meter (123), be used for measuring nitrogen flow；Waste liquid pool (13)
It is connected with the sewage draining exit of testpieces (1) by fused salt pipeline and the second high-temperature ball valve (911), off-test
Fused salt in rear discharge testpieces (1)；Outside fused salt inlet pipeline and blow-off line, it is wound around heater strip be used for trying
Before and after testing, fused salt pipeline is preheated；
In chilled(cooling) water return (CWR), cooling water tank (4) pass sequentially through the first ball valve (904), the first filter (601),
First centrifugal pump (502) connects with the lower water inlet of corresponding pipeline with testpieces (1)；Install on water tank
Second thermometer (104) is used for monitoring water temperature change in water tank；The downstream line of the first centrifugal pump (502)
On have a threeway, the vertical branch of threeway is communicated to cooling water tank (4) by pipeline and the second ball valve (905)
Constitute a bypass circulation, for assisting the flow of regulation cooling water；The downstream line of threeway is pacified successively
Fill the 3rd Pressure gauge (113), the first electromagnetic flowmeter (124) and three thermocouple (105), obtain respectively
Pipeline pressure, cooling water flow and inlet temperature；
The cooling water heated by testpieces (1) is extensive through the cooling of plate type heat exchanger (7) and cooling tower (8)
Cooling water tank (4) is returned after arriving initial water temperature again；At the primary side water inlet of plate type heat exchanger (7), logical
Piping and the 3rd ball valve (906) are connected with the coolant outlet on testpieces (1) top, pacify on pipeline
Fill the 4th thermocouple (106) and obtain cooling water outlet temperature；Primary side water outlet at plate type heat exchanger (7)
Mouthful, it is connected with cooling water tank (4) by pipeline and the 4th ball valve (907), forms primary side closed-loop path；
The secondary side water (flow) direction of plate type heat exchanger (7) and primary side flow to as countercurrently, and secondary side outlet leads to successively
Cross the 5th ball valve (908) and the second electromagnetic flowmeter (125) is connected to the water inlet of cooling tower (8)；Cold
But the outlet of tower (8) passes sequentially through the second filter (602), the second centrifugal pump (503), the 6th ball valve
And corresponding pipeline (909), it is connected with plate type heat exchanger (7) secondary side water inlet, forms secondary side Guan Bi
Loop；Secondary circuit pipeline is installed the 5th thermocouple (107), the second electromagnetic flowmeter (125) and the 4th
Pressure gauge (114) obtains secondary circuit cooling water temperature, flow and pipeline pressure respectively；This external 3rd ball valve
(906) having a threeway in downstream line, the vertical branch of threeway passes through pipeline and the 7th ball valve (910)
It is connected to the 4th ball valve (907) upstream and constitutes a bypass circulation, for assisting the flow of regulation cooling water；
Pilot system also includes that supporting controller switching equipment (14), I &C equipment (15) and collecting measurement data sets
Standby (16).
One the most according to claim 1 large-scale nuclear reactor fusion pool heat transfer free convection pilot system,
It is characterized in that: described fused salt heating furnace (2) uses Electric heating to be heated by fused mass analogies nitrate
It is melted to 350 DEG C of molten states, is then injected in testpieces (1) by high-temperature molten salt submerged pump (501)；
The first thermometer (103) and the second Pressure gauge (112) on fused salt heating furnace (2) are used for monitoring fused salt and add
Temperature and pressure change in hot stove (2).
One the most according to claim 1 large-scale nuclear reactor fusion pool heat transfer free convection pilot system,
It is characterized in that: the valve of described cooling water system design many places and bypass line, conveniently carry out discharge
Regulation, it is ensured that the temperature of cooling water inlet temperature measurement three thermocouple (105) at testpieces (1) place is protected
Hold constant, reduce the cooling water temperature fluctuation impact on fusion pool heat transfer characteristic.
One the most according to claim 1 large-scale nuclear reactor fusion pool heat transfer free convection pilot system,
It is characterized in that: entering of the hot test part (1) of described pilot system, fused salt heating furnace (2) and fused mass
Outlet conduit surface is all coated with heat-insulation layer；Described heat-insulation layer includes the silicate aluminum board cladding fixing with thin wire
Layer, is wrapped in the aluminium-foil paper outside the glass wool cloth outside silicate aluminum board clad, and sticking glass silk cloth；Bag
The average thickness of coating is more than 150mm.
One the most according to claim 1 large-scale nuclear reactor fusion pool heat transfer free convection pilot system,
It is characterized in that: described controller switching equipment (14) mainly includes power distribution cabinet, power transmission line and the electricity consumption being sequentially connected with
Equipment, power supply source capacity meets the need for electricity that pilot system is whole；Described I &C equipment (15) mainly wraps
Include the display instrument at each position, test loop, molten salt furnace starts control platform, pump for liquid salts centrifugal pump starts control
Platform processed and heating system start and control platform；Described DATA REASONING and collecting device (16) mainly include heat
Galvanic couple, effusion meter and pressure transducer, rosette, capture card, measurement module, signal conditioner, calculating
The drive software of machine and data acquisition software.
6. the examination of a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system described in claim 1
Proved recipe method, it is characterised in that: before on-test, need in advance fused salt heating is melted to temperature required and is protected
Temperature；Open successively DATA REASONING and acquisition system (16), the preheating of fused salt pipeline, the first centrifugal pump (502),
Second centrifugal pump (503) and the inside heating system of testpieces (1), reinject fused salt afterwards and start examination
Test；The heat produced when the cooling heat taken away of water and testpieces (1) heating rod balances each other, fusion pool temperature
Significant change no longer occurs, and heat transfer experiments reaches stable state, then switching heating power or end test；?
In high-temperature molten salt stove (2) heating process and testpieces (1) process of the test, it is required for source nitrogen (3) and supplements
Nitrogen carries out air exclusion；Need before off-test first fused salt blow-off line to be preheated, then open second
Waste liquid inner for testpieces (1) is drained in waste liquid pool (13) by high-temperature ball valve (911), is then shut off examination
Test the inside heating system of part (1)；Testpieces (1) needs to proceed cooling until temperature is down to 100 DEG C
Hereinafter can close the first centrifugal pump (502) and the second centrifugal pump (503).
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