CN105911087B - A kind of large size nuclear reactor fusion pool heat transfer free convection pilot system and method - Google Patents
A kind of large size nuclear reactor fusion pool heat transfer free convection pilot system and method Download PDFInfo
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- CN105911087B CN105911087B CN201610383014.5A CN201610383014A CN105911087B CN 105911087 B CN105911087 B CN 105911087B CN 201610383014 A CN201610383014 A CN 201610383014A CN 105911087 B CN105911087 B CN 105911087B
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Abstract
A kind of large size nuclear reactor fusion pool heat transfer free convection pilot system and method, the system include large-scale fusion pool heat transfer free convection testpieces, provide the fused salt heating furnace of high-temperature molten, the source nitrogen connecting with testpieces and molten salt furnace and chilled(cooling) water return (CWR)；Pilot system further includes matched controller switching equipment, I &C equipment and collecting measurement data equipment；In chilled(cooling) water return (CWR), the water in centrifugal water pump driving cooling water tank takes away decay heat source by the cooling duct of testpieces, and the cooling water being heated returns cooling water tank after being restored to initial water temperature by plate heat exchanger and cooling tower；Until off-test when fusion pool temperature reaches stable state, is drained into waste liquid pool for the waste liquid in testpieces；The present invention also provides test methods；For the present invention by carrying out large-scale nuclear reactor fusion pool heat transfer free convection test, the fusion pool heat exchange data under the conditions of acquisition reactor disaster carry out safe design.
Description
Technical field
The present invention relates to the fusion pool heat transfer free convection characteristic studying technological domain under the conditions of reactor disaster, tools
Body is related to a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system and method.
Background technique
If nuclear power plant's reactor core cannot get enough coolings in the case where severe accident conditions occur, decay heat it is continuous
Accumulation will lead to reactor core steep temperature rise and melt, and the reactor core fusant after fusing migrates gradually downward, and burn through support plate is fallen
Fragment bed is formed in lower head melts pool structure.Corresponding to the extreme condition of Whole core fusing, the fusion pool in lower head exists
The free convection of high Rayleigh number occurs under the action of inner heat source, downward header wall transmits heat.If lower head outside wall surface
Forcing functions can not take away the decay heat that fusion pool transmitting comes, and lower head wall surface, which can be gradually warmed up, occurs high-temerature creep until molten
Failure is worn, a large amount of radioactive substances is caused to leak.
The heat transfer phenomenons such as the thermally stratified layer occurred in fusion pool and Natural Circulation directly determine that the heat of pressure vessel wall surface is negative
Lotus, this largely realizes that pressure vessel integrality has played vital effect to success.Therefore, by opening
Large-scale fusion pool heat transfer free convection attribute testing research is opened up, can determine that fusion pool divides pressure vessel wall surface thermic load
Cloth has great importance to design of pressure vessels safety analysis.
For fusion pool heat transfer free convection characteristic, different tests is using different tests design, different fusant moulds
Quasi- object, different boundary conditions, therefore also obtained different test results.Key ginseng of the Rayleigh number as heat convection problem
Number has important influence to the Convective Heat-Transfer Characteristics in fusion pool.The selection of fusant material is that can decision accurate simulation
The key factor of true fusant heat transfer process.Carry out the cost of fusion pool heat transfer characteristic test due to directlying adopt leiomyoma cells
It is very high, while experimental design also wants the more of complexity, therefore ongoing fusion pool heat transfer characteristic test all uses in the world at present
Alternative materials carry out.Selected material should be non-eutectic mixture, and have apparent solidus temperature and liquid phase
Line temperature difference has coagulating property similar with reactor core oxidation fusion object, and should not Stainless steel pressure vessels be generated with corrosion and broken
It is bad, since there are certain restrictions, the temperature of fusant in the selection of technical operation and fusant heating system and heating furnace
It should not be more than 1000 DEG C.
For example, 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-
And document (Asfia FJ, Dhir VK.An experimental study of natural convection in a 57)
volumetrically heated spherical pool bounded on top with a rigid wall[J]
.Nuclear Engineering and Design, 1996,163 (3): 333-348) disclosed in fusion pool heat transfer experiments circuit,
Water and freon is respectively adopted as melting substance simulant in test, and lower head outside wall surface uses water at low temperature as coolant.But this
Two kinds of pilot systems are unable to carry out the research of high temperature melting melt pool heat transfer free convection characteristic, cannot reflect that true fusant is high
The coagulating property of the eutectic feature of temperature.
In another example 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 melting
Pond heat transfer experiments circuit, using high temperature NaNO3And KNO3Substitution material of the binary mixture as fusant in actual response heap
Material, using water as coolant.But due to test section small volume, fusion pool Rayleigh number is less than normal compared to reactor magnitude,
Molten salt furnace use topples over mode and pours into high-temperature molten salt in testpieces, and such mode is in the hot test for carrying out large scale magnitude
Has certain risk, and infeasible.
Summary of the invention
In order to overcome the above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of large-scale nuclear reactor is molten
Melt pool heat transfer free convection pilot system and method are carried out large-scale nuclear reactor fusion pool heat transfer free convection test, are obtained anti-
Answer the fusion pool heat exchange data under heap severe accident conditions.
In order to achieve the above object, the present invention adopts the following technical scheme:
A kind of large size nuclear reactor fusion pool heat transfer free convection pilot system, including large-scale nuclear reactor fusion pool are natural
Heat convection testpieces 1, testpieces 1 include internal heating system and cooling duct, and the first thermocouple is installed in testpieces 1
101 and first pressure gauge 111 for the temperature and pressure variation in monitoring test part 1；The fused salt heating furnace 2 of high-temperature molten according to
It is secondary to be connected by high-temperature molten salt submerged pump 501, the first high-temperature ball valve 901 and corresponding fused salt pipeline with testpieces 1, it is installed on pipeline
Second thermocouple 102 and high-temperature electromagnetic flowmeter 121 are used to measure the temperature of molten salt and flow at 1 fused salt inlet of testpieces；
Nitrogen is supplemented when making fusant using fused salt and carries out high-temp antioxidizing protection, and source nitrogen 3 passes through the first nitrogen pressure reducing valve respectively
902 and second nitrogen pressure reducing valve 903 and corresponding nitrogen pipeline be connected with testpieces 1 and fused salt heating furnace 2, pacify respectively on pipeline
The first vortex-shedding meter 122 and the second vortex-shedding meter 123 are filled, for measuring nitrogen flow；Waste liquid pool 13 passes through fused salt pipeline
It is connected with the second high-temperature ball valve 911 with the sewage draining exit of testpieces 1, the fused salt in testpieces 1 is discharged after the test；Fused salt into
Heater strip is wound outside mouth pipeline and blow-off line for preheating before and after testing to fused salt pipeline；
In chilled(cooling) water return (CWR), cooling water tank 4 passes sequentially through the first ball valve 904, first filter 601, the first centrifugal pump 502
It is connected to corresponding pipeline with the lower water inlet of testpieces 1；Second temperature table 104 is installed, for monitoring water in water tank on water tank
Temperature variation；There is a threeway in the downstream line of first centrifugal pump 502, the vertical branch of threeway passes through pipeline and the second ball valve
905, which are communicated to cooling water tank 4, constitutes a bypass circulation, for assisting the flow of adjusting cooling water；In the downstream line of threeway
On third pressure gauge 113, the first electromagnetic flowmeter 124 and third thermocouple 105 are successively installed obtain pipeline pressure, cooling respectively
Water flow and inlet temperature；
By cooling water that testpieces 1 heats after the cooling of plate heat exchanger 7 and cooling tower 8 is restored to initial water temperature again
Return to cooling water tank 4；In the primary side water inlet of plate heat exchanger 7, pass through pipeline and third ball valve 906 and 1 top of testpieces
Cooling water outlet be connected, on pipeline install the 4th thermocouple 106 obtain cooling water outlet temperature；In plate heat exchanger 7
Primary side water outlet is connected by pipeline and the 4th ball valve 907 with cooling water tank 4, and primary side closed circuit is formed；Plate-type heat-exchange
Secondary side water (flow) direction and the primary side flow direction of device 7 are adverse current, and secondary side water outlet passes sequentially through the 5th ball valve 908 and the second electricity
Magnetic flowmeter 125 is connected to the water inlet of cooling tower 8；The water outlet of cooling tower 8 pass sequentially through the second filter 602, second from
Heart pump 503, the 6th ball valve 909 and corresponding pipeline are connected with 7 secondary side water inlet of plate heat exchanger, form secondary side and are closed back
Road；5th thermocouple 107, the second electromagnetic flowmeter 125 and the 4th pressure gauge 114 are installed on secondary circuit pipeline and obtain two respectively
Circuit cooling water temperature, flow and pipeline pressure；Furthermore there is a threeway in the downstream line of third ball valve 906, threeway
Vertical branch is connected to 907 upstream of the 4th ball valve by pipeline and the 7th ball valve 910 and constitutes a bypass circulation, adjusts for assisting
Save the flow of cooling water；
Pilot system further includes matched controller switching equipment 14, I &C equipment 15 and collecting measurement data equipment 16.
The fused salt heating furnace 2 will melt the heating of substance simulant nitrate using Electric heating and be melted to 350 DEG C of meltings
Then state is injected into testpieces 1 by high-temperature molten salt submerged pump 501；The first thermometer 103 in fused salt heating furnace 2 and
Two pressure gauges 112 are used to monitor the temperature and pressure variation in fused salt heating furnace 2.
The cooling water system design valve and bypass line of many places facilitates and carries out water flow adjusting, guarantee test
The temperature of cooling water inlet temperature measurement third thermocouple 105 at part 1 is kept constant, and reduces cooling water temperature fluctuation to melting
The influence of pond heat transfer characteristic.
The inlet and outlet pipe surface of the hot test part 1 of the pilot system, fused salt heating furnace 2 and fusant is all coated with
Insulating layer；The insulating layer includes the silicate aluminum board clad fixed with thin wire, the glass being wrapped in outside silicate aluminum board clad
Glass silk cloth, and paste the aluminium-foil paper outside glass wool cloth；The average thickness of clad is greater than 150mm.
The controller switching equipment 14 mainly includes sequentially connected power distribution cabinet, power transmission line and electrical equipment, and power supply source capacity is full
The power demand of sufficient pilot system whole；The I &C equipment 15 mainly includes the display instrument at each position in test loop, melts
Salt furnace starts control platform, pump for liquid salts centrifugation pump startup control platform and heating system and starts control platform；The DATA REASONING
It mainly include thermocouple, flowmeter and pressure sensor, terminal box, capture card, measurement module, signal condition with acquisition equipment 16
The drive software and data acquisition software of device, computer.
A kind of test method of large-scale nuclear reactor fusion pool heat transfer free convection pilot system described above, experiment opening
Before beginning, needs that fused salt heating is melted to required temperature in advance and keep the temperature；Successively open DATA REASONING and acquisition system 16, fused salt
Pipeline preheating, the first centrifugal pump 502, the second centrifugal pump 503 and testpieces 1 inside heating system, reinject fused salt later
Start to test；When the heat that the heat that cooling water is taken away is generated with 1 heating rod of testpieces balances each other, fusion pool temperature no longer occurs
Significant change, heat transfer experiments reach stable state, then switch heating power or terminate test；In 2 heating process of high-temperature molten salt furnace
During being tested with testpieces 1, requires source nitrogen 3 and supplement nitrogen progress air exclusion；It is needed before off-test first to fused salt
Blow-off line is preheated, then opens the second high-temperature ball valve 911 and the waste liquid in testpieces 1 is drained into waste liquid pool 13, then
Close the inside heating system of testpieces 1；The needs of testpieces 1 continue it is cooling until temperature be down to 100 DEG C or less can
Close the first centrifugal pump 502 and the second centrifugal pump 503.
Compared to the prior art compared with the present invention has following advantage:
A kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system and method for the present invention, are for pressure
The test invented the characteristics of fusion pool heat transfer free convection in lower head under the conditions of water-water reactor nuclear power plant reactor disaster
System, pilot system of the invention carry out test using high-temperature molten, can be realized the high Rayleigh said conditions of reactor magnitude,
Test result can be applied to engineering in practice compared with limits；
A kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system and method for the present invention, using high temperature
Molten salt furnace prepares the alternative materials of 350 DEG C of molten state nitrate as actual response heap fusant, as far as possible with actual response
The leiomyoma cells behavior of fusant is close in heap.Fused salt is injected to testpieces by high-temperature molten salt submerged pump, it is ensured that safety
Property be not present again fused salt blocking pipeline the problem of.
A kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system and method for the present invention, cooling water system
System can take away the decay heat in testpieces by cooling water tank, plate heat exchanger and cooling tower, until fusion pool reaches stable state.
Cooling water tank and plate heat exchanger are provided with bypass line, facilitate and carry out flow adjusting, and guarantee test part inlet water temperature is stablized,
Reduce the influence to fusion pool heat transfer characteristic.
Detailed description of the invention
Fig. 1 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system schematic diagram of the present invention.
Fig. 2 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system function structure chart of the present invention.
Fig. 3 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system controller switching equipment schematic diagram of the present invention.
Fig. 4 is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system I &C equipment schematic diagram of the present invention.
Fig. 5 is that a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system DATA REASONING of the present invention is set with acquisition
Standby schematic diagram.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description:
As depicted in figs. 1 and 2, the present invention is a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system and side
Method, the pilot system include large-scale nuclear reactor fusion pool heat transfer free convection testpieces 1, provide the fused salt of high-temperature molten
Heating furnace 2, the source nitrogen 3 and cooling water system being connect with testpieces and molten salt furnace；First centrifugal pump 502 drives cooling water
Water in case 4 takes away decay heat source by the cooling duct of testpieces 1, and the cooling water being heated is by plate heat exchanger 7 and cold
But the cooling of tower 8 returns cooling water tank 4 after being restored to initial water temperature；Until off-test when fusion pool temperature reaches stable state,
Waste liquid in testpieces 1 is drained into waste liquid pool 13；Pilot system further includes matched controller switching equipment 14,15 sum number of I &C equipment
Equipment 16 is acquired according to measurement.
The large size nuclear reactor fusion pool heat transfer free convection testpieces 1 includes internal heating system and cooling duct,
First thermocouple 101 and first pressure gauge 111 are installed in testpieces 1 for the temperature and pressure variation in monitoring test part 1.
The fused salt heating furnace 2 of the high-temperature molten passes sequentially through high-temperature molten salt submerged pump 501, the first high-temperature ball valve 901 and accordingly melts
Salt pipeline is connected with testpieces 1, and the second thermocouple 102 and high-temperature electromagnetic flowmeter 121 are installed on pipeline for measuring testpieces 1
Temperature of molten salt and flow at fused salt inlet.Nitrogen is supplemented when making fusant using fused salt carries out high-temp antioxidizing protection,
Source nitrogen 3 passes through the first nitrogen pressure reducing valve 902 and the second nitrogen pressure reducing valve 903 and corresponding nitrogen pipeline and testpieces 1 respectively
It is connected with fused salt heating furnace 2, the first vortex-shedding meter 122 and the second vortex-shedding meter 123 are installed for measuring by branch on pipeline
Nitrogen flow.
In chilled(cooling) water return (CWR), cooling water tank 4 passes sequentially through the first ball valve 904, first filter 601, the first centrifugal pump 502
It is connected to corresponding pipeline with the lower water inlet of testpieces 1, second temperature table 104 is installed for monitoring water temperature in water tank on water tank
Variation.There is a threeway in the downstream line of first centrifugal pump 502, the vertical branch of threeway passes 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 adjusting cooling water；In the downstream line of threeway according to
Secondary installation third pressure gauge 113, the first electromagnetic flowmeter 124 and third thermocouple 105 obtain pipeline pressure, cooling water flow respectively
Amount and inlet temperature.Initial water is restored to by the cooling of plate heat exchanger 7 and cooling tower 8 by the cooling water that testpieces 1 heats
Cooling water tank 4 is returned after temperature.In the primary side water inlet of plate heat exchanger 7, pass through pipeline and third ball valve 906 and testpieces
The cooling water outlet on 1 top is connected, and the 4th thermocouple 106 is installed on pipeline and obtains cooling water outlet temperature；In plate-type heat-exchange
The primary side water outlet of device 7 is connected by pipeline and the 4th ball valve 907 with cooling water tank 4, and primary side closed circuit is formed.Plate
Secondary side water (flow) direction and the primary side flow direction of formula heat exchanger 7 are adverse current, and secondary side water outlet passes sequentially through 908 He of the 5th ball valve
Second electromagnetic flowmeter 125 is connected to the water inlet of cooling tower 8；The water outlet of cooling tower 8 pass sequentially through the second filter 602,
Second centrifugal pump 503, the 6th ball valve 909 and corresponding pipeline are connected with 7 secondary side water inlet of plate heat exchanger, form secondary side and close
Close circuit.5th thermocouple 107, the second electromagnetic flowmeter 125 and the 4th pressure gauge 114 are installed to obtain respectively on secondary circuit pipeline
Obtain secondary circuit cooling water temperature, flow and pipeline pressure.Furthermore there is a threeway in the downstream line of third ball valve 906, three
Logical vertical branch is connected to 907 upstream of the 4th ball valve by pipeline and the 7th ball valve 910 and constitutes a bypass circulation, for assisting
Help the flow for adjusting cooling water.
As the preferred embodiment of the present invention, the cooling water system design valve and bypass line of many places, side
Just water flow adjusting is carried out, the temperature of the cooling water inlet temperature measurement third thermocouple 105 at guarantee test part 1 keeps permanent
It is fixed, reduce influence of the cooling water temperature fluctuation to fusion pool heat transfer characteristic.
As the preferred embodiment of the present invention, the hot test part of the pilot system, molten salt furnace and fusant into
Outlet conduit surface is all coated with insulating layer.The insulating layer includes the silicate aluminum board clad fixed with thin wire, is wrapped in
Glass wool cloth outside silicate aluminum board clad, and paste the aluminium-foil paper outside glass wool cloth.The effect of thin wire is fixed and pressure
Tight silicate aluminum board, the effect of glass wool cloth are the contacts for reducing people with silicate aluminum board, and the effect of aluminium-foil paper is to paste glass wool cloth
The tidiness at further coating alumina silicate plate and lifting test scene.The maximum temperature of this pilot system can reach 350 DEG C, silicic acid
Aluminium sheet coating thickness should be greater than 150mm.Heater strip is wound outside fused salt inlet pipeline and blow-off line before and after for testing
Pipeline is preheated, heater strip is coated in heat-preservation cotton.
As shown in figure 3, the controller switching equipment 14 mainly includes sequentially connected matches as the preferred embodiment of the present invention
Electric cabinet, power transmission line and electrical equipment.The power supply source capacity of controller switching equipment 14 meets pilot system demand, provides and adds for pilot system
The power of the heating power supply of the pre- heated filament of the heating power supply of hot pin, the heating power supply of molten salt furnace, pipeline, fused salt submerged pump and centrifugal pump
Power supply, the working power of I &C equipment and data acquisition equipment, working power of lighting apparatus etc..
As shown in figure 4, the I &C equipment 15 mainly includes that test loop is each as the preferred embodiment of the present invention
Display instrument, molten salt furnace starting control platform, pump for liquid salts centrifugation pump startup control platform and the heating system starting control at position
Platform, specific component include pressure regulator, thermometer, pressure gauge, flowmeter and valve positioner.Electric heating is adjusted by pressure regulator
Power, the state of fusion pool and cooling water is shown by thermometer and pressure gauge, shows fused salt, nitrogen and cooling by flowmeter
The flow of water adjusts valve opening by valve positioner.
As shown in figure 5, the DATA REASONING and acquisition equipment 16 mainly include thermocouple, flowmeter and pressure sensor,
Terminal box, capture card, measurement module, signal conditioner, computer drive software and data acquisition software.Thermocouple, flow
Physical parameter is converted electric signal by meter and pressure sensor, by terminal box, is transferred to signal conditioner and is filtered adjusting,
Digital signal is converted electrical signals by measurement module and data collecting card, is supplied to drive software and the data acquisition of computer
Then software is processed and displayed the signal of all the sensors by the dedicated program that LabView is compiled.
Large size nuclear reactor fusion pool heat transfer free convection test method of the invention, specific test operation process are as follows:
For fused salt heating furnace 2 by nitrate heating melting and heat preservation at 350 DEG C, fused salt liquid level reaches feed opening position, opens in heating process
Nitrogen protection opens the cooling of the motor of high-temperature molten salt submerged pump 501.In practical heating process, need gradually to add to molten salt furnace
Material adds virgin material after solid salt fusing volume reduces.In addition, heating initial stage is first taken since heat transfer efficiency is not high
Small-power steps up power, avoids heating rod central temperature excessively high.During molten salt furnace heating process and test, it should ensure that
Enough nitrogen supply (NS)s can choose multiple nitrogen cylinder joints and carry out nitrogen supply (NS), use the first nitrogen pressure reducing valve 902 and second
Nitrogen pressure reducing valve 903 controls nitrogen flow.Turn-on data measurement and 16 start recording data of acquisition system；Fused salt prepares
Afterwards, it checks the valvular opening and closing of institute, opens the first centrifugal pump 502 and the second centrifugal pump 503, operating chilled(cooling) water return (CWR) reaches steady
State, until inlet and outlet water temperature is constant；The preheating of fused salt feeding tube is opened until 250 DEG C；Pressure regulator is adjusted, testpieces 1 is opened
Heating system opens the nitrogen protection of test section to required power；High-temperature molten salt submerged pump 501 is opened, it is molten to the injection of testpieces 1
Salt, the fusion pool temperature change that monitoring and acquisition system is shown close fused salt submerged pump 501 and pre- after fused salt reaches specified altitude assignment
Hot heater strip；Real-time Monitoring Data acquisition adjusts heating power and cooling water flow until system reaches stable state；Switching heating function
Rate adjusts cooling water flow until stable state to next operating condition；The blow-off line starting point is connected to 1 bottom of testpieces, and outlet is straight
It connects into waste liquid pool 13, before off-test, opens blow-off line and be preheated to 250 DEG C, open the second high-temperature ball valve of blowdown 911, examination
Testing fused salt in part 1 relies on gravity to be directly discharged into waste liquid pool 13；The heating system of closing testpieces 1 later, but testpieces 1
Need to continue cooling until temperature is down to 100 DEG C or less and can just close the first centrifugal pump 502 and the second centrifugal pump 503.
Claims (6)
1. a kind of large size nuclear reactor fusion pool heat transfer free convection pilot system, it is characterised in that: certainly including large-scale fusion pool
Right heat convection testpieces (1), testpieces (1) include internal heating system and cooling duct, the installation first in testpieces (1)
Thermocouple (101) and first pressure gauge (111), for the temperature and pressure variation in monitoring test part (1)；High-temperature molten
Fused salt heating furnace (2) passes sequentially through high-temperature molten salt submerged pump (501), the first high-temperature ball valve (901) and corresponding fused salt pipeline and examination
It tests part (1) to be connected, the second thermocouple (102) and high-temperature electromagnetic flowmeter (121) is installed, for measuring testpieces (1) on pipeline
Temperature of molten salt and flow at fused salt inlet；First thermometer (103) and second pressure gauge are installed on fused salt heating furnace (2)
(112), for monitoring the variation of the temperature and pressure in fused salt heating furnace (2)；When making fusant using fused salt supplement nitrogen into
The protection of row high-temp antioxidizing, source nitrogen (3) respectively by the first nitrogen pressure reducing valve (902) and the second nitrogen pressure reducing valve (903) with
And corresponding nitrogen pipeline is connected with testpieces (1) and fused salt heating furnace (2), installs the first vortex-shedding meter on pipeline respectively
(122) and the second vortex-shedding meter (123), for measuring nitrogen flow；Waste liquid pool (13) passes through fused salt pipeline and the second high temperature
Ball valve (911) is connected with the sewage draining exit of testpieces (1), and the fused salt in testpieces (1) is discharged after the test；In fused salt inlet tube
Heater strip is wound outside road and blow-off line to preheat fused salt pipeline for testing front and back；
In chilled(cooling) water return (CWR), cooling water tank (4) passes sequentially through the first ball valve (904), first filter (601), the first centrifugal pump
(502) it is connected to corresponding pipeline with the lower water inlet of testpieces (1)；Second temperature table (104) are installed for monitoring on water tank
Water temperature changes in water tank；Have a threeway in the downstream line of first centrifugal pump (502), the vertical branch of threeway by pipeline with
Second ball valve (905) is communicated to cooling water tank (4) and constitutes a bypass circulation, for assisting the flow of adjusting cooling water；Three
Third pressure gauge (113), the first electromagnetic flowmeter (124) and third thermocouple (105) are successively installed in logical downstream line, point
It Huo get not pipeline pressure, cooling water flow and inlet temperature；
The cooling water heated by testpieces (1) is after the cooling of plate heat exchanger (7) and cooling tower (8) is restored to initial water temperature
Return cooling water tank (4)；In the primary side water inlet of plate heat exchanger (7), pass through pipeline and third ball valve (906) and test
The cooling water outlet on part (1) top is connected, and the 4th thermocouple (106) is installed on pipeline and obtains cooling water outlet temperature；In plate
The primary side water outlet of formula heat exchanger (7) is connected by pipeline and the 4th ball valve (907) with cooling water tank (4), and primary side is formed
Closed circuit；Secondary side water (flow) direction and the primary side flow direction of plate heat exchanger (7) are adverse current, and secondary side water outlet passes sequentially through
5th ball valve (908) and the second electromagnetic flowmeter (125) are connected to the water inlet of cooling tower (8)；The water outlet of cooling tower (8) according to
It is secondary to pass through the second filter (602), the second centrifugal pump (503), the 6th ball valve (909) and corresponding pipeline, with plate heat exchanger (7)
Secondary side water inlet is connected, and forms secondary side closed circuit；5th thermocouple (107), the second electricity are installed on secondary circuit pipeline
Magnetic flowmeter (125) and the 4th pressure gauge (114) obtain secondary circuit cooling water temperature, flow and pipeline pressure respectively；Furthermore exist
There is a threeway in the downstream line of third ball valve (906), the vertical branch of threeway is connect by pipeline with the 7th ball valve (910)
A bypass circulation is constituted to the 4th ball valve (907) upstream, for assisting the flow of adjusting cooling water；
Pilot system further includes matched controller switching equipment (14), I &C equipment (15) and DATA REASONING and acquisition equipment (16).
2. a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system according to claim 1, feature exist
In: the fused salt heating furnace (2) will melt the heating of substance simulant nitrate using Electric heating and be melted to 350 DEG C of molten states,
Then it is injected into testpieces (1) by high-temperature molten salt submerged pump (501).
3. a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system according to claim 1, feature exist
In: the cooling water system design valve and bypass line of many places, facilitates and carry out water flow adjusting, guarantee test part (1)
The temperature of the cooling water inlet temperature measurement third thermocouple (105) at place is kept constant, and reduces cooling water temperature fluctuation to melting
The influence of pond heat transfer characteristic.
4. a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system according to claim 1, feature exist
It is all coated in the inlet and outlet pipe surface of the hot test part (1) of: the pilot system, fused salt heating furnace (2) and fusant
Insulating layer；The insulating layer includes the silicate aluminum board clad fixed with thin wire, the glass being wrapped in outside silicate aluminum board clad
Glass silk cloth, and paste the aluminium-foil paper outside glass wool cloth；The average thickness of clad is greater than 150mm.
5. a kind of large-scale nuclear reactor fusion pool heat transfer free convection pilot system according to claim 1, feature exist
In: the controller switching equipment (14) mainly includes sequentially connected power distribution cabinet, power transmission line and electrical equipment, and power supply source capacity meets examination
The power demand of check system whole；The I &C equipment (15) mainly includes display instrument, the fused salt at each position in test loop
Furnace starts control platform, pump for liquid salts centrifugation pump startup control platform and heating system and starts control platform；The DATA REASONING with
Acquiring equipment (16) mainly includes thermocouple, flowmeter and pressure sensor, terminal box, capture card, measurement module, signal condition
The drive software and data acquisition software of device, computer.
6. a kind of test method of large-scale nuclear reactor fusion pool heat transfer free convection pilot system described in claim 1,
It is characterized in that: before on-test, needing that fused salt heating is melted to required temperature in advance and keep the temperature；Successively open DATA REASONING with
Acquisition system (16), fused salt pipeline preheating, the first centrifugal pump (502), the second centrifugal pump (503) and testpieces (1) inside
Heating system reinjects fused salt later and starts to test；When the heat that heat and testpieces (1) heating rod that cooling water is taken away generate
It balances each other, significant change no longer occurs for fusion pool temperature, and heat transfer experiments reach stable state, then switches heating power or terminates examination
It tests；During fused salt heating furnace (2) heating process and testpieces (1) are tested, requires source nitrogen (3) supplement nitrogen and carry out sky
Air bound is exhausted；It needs first to preheat fused salt blow-off line before off-test, then opens the second high-temperature ball valve (911) for testpieces
(1) inner waste liquid is drained into waste liquid pool (13), is then shut off the inside heating system of testpieces (1)；Testpieces (1) need after
It is continuous to carry out cooling until temperature is down to 100 DEG C or less and close the first centrifugal pump (502) and the second centrifugal pump (503).
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