CN112361948B - Heating device for simulating different temperature control of fuel rod-spent pool - Google Patents
Heating device for simulating different temperature control of fuel rod-spent pool Download PDFInfo
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- CN112361948B CN112361948B CN202011178735.5A CN202011178735A CN112361948B CN 112361948 B CN112361948 B CN 112361948B CN 202011178735 A CN202011178735 A CN 202011178735A CN 112361948 B CN112361948 B CN 112361948B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
Abstract
The invention discloses a heating device for simulating different temperature control of a fuel rod-spent pool, which comprises a standard rod for simulating the fuel rod and a heating mechanism for simulating the spent pool; the standard sample rod comprises a heater and a cladding tube, the heater is arranged on the inner side of the cladding tube, and two ends of the cladding tube and the outer wall of the heater are packaged by waterproof high-temperature-resistant materials; the heater comprises a metal pipe, wherein Cr20Ni80 and hexagonal boron nitride are arranged in the metal pipe, and a thermocouple is arranged on the outer wall of the cladding pipe; the heating mechanism comprises a standard sample groove and a standard sample rod mounting rack; the standard sample groove is used for providing a water environment, and a cold water inlet pipe, a hot water inlet pipe and a drain pipe are arranged on the standard sample groove; the sample rod mounting rack is arranged at the top of the sample groove and used for mounting a sample rod. The heating device can simulate the temperature of the fuel rod and the water environment temperature of the spent pool, can simulate different temperature control environments, and further completes the curve of oxide film thickness measurement under different temperature control.
Description
Technical Field
The invention relates to the technical field of nuclear fuel heating, in particular to a heating device for simulating different temperature control of a fuel rod-spent pool.
Background
The fuel rod cladding in the fuel assembly after operation can corrode to form an oxide film, and the factors seriously influence the service performance of the fuel assembly. In order to ensure the operation safety of the reactor, the thickness of the oxide film of the fuel assembly (rod) after irradiation is checked after a period of operation, and the assembly exceeding the limit value is replaced.
After being unloaded, the irradiated fuel rod is placed in a spent pool, the internal self-heating of the fuel rod (kept at 70-100 ℃) causes the temperature of the surrounding water in the spent pool (30-50 ℃), the thickness measurement of an oxidation film needs to be carried out in the spent pool water, the factors influencing the thickness measurement of the oxidation film are the temperature of a fuel rod and the temperature of the water environment, in order to ensure the measurement state and the detection effect of the oxidation film in the actual engineering detection, a measurement experiment for simulating the underwater environment temperature of the spent pool needs to be carried out, and an automatic heating and control device capable of simulating the self-heating effect of different fuel rods and adjusting different water temperatures needs to be developed.
Disclosure of Invention
The invention aims to provide a heating device for simulating different temperature control of the temperature of a fuel rod and the temperature of water in a spent pool, which can simulate the temperature of different fuel rods and the temperature of water environment of different spent pools, can simulate the environment with different temperature control to carry out experimental research, and further complete the curve preparation of the eddy thickness measurement of an oxide film under the influence of different temperatures.
The invention is realized by the following technical scheme:
the heating device for simulating different temperature control of the fuel rod-spent pool comprises a standard sample rod for simulating the fuel rod and a heating mechanism for simulating the temperature of the spent pool water;
the standard sample rod comprises a heater and a cladding tube, the heater is arranged on the inner side of the cladding tube, and two ends of the cladding tube and the outer wall of the heater are packaged by waterproof high-temperature-resistant materials;
the heater comprises a metal tube, a heating body and a filling material are arranged in the metal tube, the heating body and the filling material are respectively Cr20Ni80 and hexagonal boron nitride, the heater is led out through a leading-out wire, and a thermocouple is arranged on the outer wall of the cladding tube;
the heating mechanism comprises a standard sample groove and a standard sample rod mounting rack;
the standard sample groove is used for providing a water environment, a cold water inlet pipe, a hot water inlet pipe and a drain pipe are arranged on the standard sample groove, and the cold water inlet pipe and the hot water inlet pipe are respectively used for supplementing cold water and hot water into the standard sample groove;
the standard bar mounting rack is mounted at the top of the standard groove and used for mounting the standard bar.
The invention adopts a special packaging mode, the end part of the cladding tube is packaged by adopting a waterproof high-temperature-resistant material, the heating element is Cr20Ni80, and the filling material is hexagonal boron nitride, so that the spontaneous heating of the fuel rod is effectively simulated, and the spontaneous heating temperature can be maintained at 70-100 ℃.
According to the invention, the heater is used for heating the water in the standard sample groove, so that the water environment in the standard sample groove can be maintained at 30-50 ℃, and the simulation of the water environment temperature of the spent pool is realized.
In conclusion, the invention realizes different temperature control of the simulated fuel rod and the ambient water, the temperature of the ambient water can be controlled to be 30-50 ℃, the temperature of the simulated fuel rod can be controlled to be 60-105 ℃, and the temperature control precision is +/-1 ℃.
Further, still include the heating water tank, the heating water tank advances union coupling with hot water, the heating water tank is used for realizing carrying out heat treatment to its inside water.
The heating water tank is prior art, and the function is preheated the hot water that experimental needs to carry out hot water according to the experimental demand and supply.
The temperature control system comprises a controller, an electromagnetic valve, a temperature controller and a temperature sensor, wherein the electromagnetic valves are arranged on the cold water inlet pipe and the hot water inlet pipe;
the temperature controller is used for collecting a temperature signal measured by the thermocouple and transmitting the temperature signal to the controller;
the temperature sensor is used for acquiring a temperature signal of the water environment in the standard sample groove and transmitting the temperature signal to the controller;
the controller is used for receiving temperature signals of the temperature controller and the temperature sensor and analyzing and judging whether to open the electromagnetic valve on the cold water inlet pipe or the hot water inlet pipe.
The temperature control system can automatically control the temperature of the water environment in the standard sample groove, and the control mode is that cold water or hot water is supplemented into the standard sample groove by adjusting the electromagnetic valve; the temperature of the water environment in the standard sample groove can be adjusted to simulate the environment with different temperature control, and then the curve of oxide film thickness measurement under different temperature control is completed.
By adopting the temperature control system, water can automatically fill the standard sample groove by setting different temperatures, the heating function of the heating box is automatically started, the automation degree is high, and the manual-automatic integrated operation can be realized.
Further, still include agitating unit, agitating unit includes the circulating pump, realizes stirring the water environment in the trade sample inslot through the circulating pump.
The stirring device can be used for carrying out temperature equalization control on water in the standard sample groove.
Further, the stirring device also comprises a circulating pump frequency conversion controller, and the circulating pump frequency conversion controller is used for adjusting the output flow of the circulating pump.
Furthermore, the top in the trade sample groove is installed to the detachable installation of trade sample stick installation rack, be provided with the mounting hole that is used for installing the trade sample stick on the trade sample stick installation rack.
Further, the heater is made of 304 stainless steel.
Further, still include the control box, the heating water tank sets up the top at the control box, the control box is used for installing control assembly.
Further, the sample groove and the control box are integrally arranged on the base, and the locking wheel is arranged at the bottom of the base.
Furthermore, the waterproof high-temperature-resistant material is silica gel and epoxy resin, the end part is encapsulated, hexagonal boron nitride is adopted between the standard sample and the heater, the thermocouple is a K-type armored thermocouple, and the outgoing line is a temperature-resistant tetrafluoro outgoing line.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention adopts a special packaging mode, the end part of the cladding tube is packaged by adopting a waterproof high-temperature-resistant material, the heating body is Cr20Ni80, and the filling material is hexagonal boron nitride, so that the self-heating of the fuel rod is effectively simulated.
2. The temperature control of the simulated fuel rods and the ambient water is realized, the temperature of the ambient water can be controlled to be 30-50 ℃, the temperature of the simulated fuel rods can be controlled to be 60-105 ℃, the temperature control precision is +/-1 ℃, the temperature of the water environment in the standard sample groove can be regulated to simulate the environment with different temperature control, and further the curve of the oxide film thickness measurement under different temperature control is completed.
3. The device is simple to operate, the temperature is set, water is filled automatically, the heating function is started automatically, the automation degree is high, and the device can be operated manually and automatically.
3. The device has wide application range and can be widely used for experiments of different temperature controls of the fuel rod.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of a construction of a proof bar;
fig. 2 is a schematic structural view of the heating device.
Reference numbers and corresponding part names in the drawings:
the method comprises the following steps of 1-a cladding tube, 2-a heater, 3-a thermocouple, 4-a leading-out wire, 5-a standard sample groove, 6-a standard sample rod mounting rack, 7-a cold water inlet pipe, 8-a hot water inlet pipe, 9-a heating water tank and 10-a control box.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
as shown in fig. 1 and 2, the heating device for simulating different temperature control of the fuel rod-spent pool comprises a standard rod for simulating the fuel rod and a heating mechanism for simulating the spent pool;
the standard sample rod comprises a heater 2 and a cladding tube 1, the cladding tube 1 is a zirconium alloy cladding tube, the heater 2 is made of 304 stainless steel, the heater 2 is arranged on the inner side of the cladding tube 1, two ends of the cladding tube 1 and the outer wall of the heater 2 are encapsulated by waterproof high-temperature-resistant materials, the waterproof high-temperature-resistant materials are silica gel and epoxy resin encapsulated end parts, and hexagonal boron nitride is adopted between the standard sample and the heater;
the heater 2 comprises a metal tube, a heating element and a filling material are arranged in the metal tube, the heating element and the filling material are respectively Cr20Ni80 and hexagonal boron nitride, the heater 2 is led out through an outgoing line 4, the outer wall of the cladding tube 1 is provided with a thermocouple 3, the thermocouple 3 is a K-type armored thermocouple, and the outgoing line 4 is a temperature-resistant tetrafluoro outgoing line;
the heating mechanism comprises a standard sample groove 5 and a standard sample rod mounting rack 6;
the standard sample groove 5 is used for providing a water environment and performing a standard sample rod heating test, a cold water inlet pipe 7, a hot water inlet pipe 8 and a drain pipe are arranged on the standard sample groove 5, and the cold water inlet pipe 7 and the hot water inlet pipe 8 are respectively used for supplementing cold water and hot water into the standard sample groove 5;
the top at standard appearance groove 5 is installed to standard appearance stick installation rack 6, standard appearance stick installation rack 6 is used for installing the standard appearance stick, specifically, the top at standard appearance groove 5 is installed through the bolt to standard appearance stick installation rack 6, be provided with the mounting hole that is used for installing the standard appearance stick on the standard appearance stick installation rack 6, the quantity of mounting hole can set up a plurality ofly, and every mounting hole corresponds a standard appearance stick, and the interval of every standard appearance stick is 70mm, the water environment of gaseous lower part submergence in standard appearance groove 5 in the mounting hole is installed to the standard appearance stick branch of academic or vocational study dismantlement formula.
In this embodiment, the cold water inlet pipe 7 is connected to a tap water pipe, and further includes a heating water tank 9, the heating water tank 9 is connected to the hot water inlet pipe 8, and the heating water tank 9 is used for heating water inside the heating water tank.
The embodiment adopts a special packaging mode, the end part of the cladding tube 1 is packaged by adopting a waterproof high-temperature-resistant material, the heating element is Cr20Ni80, and the hexagonal boron nitride is used as a filling material, so that the spontaneous heating of the fuel rod is effectively simulated, and the spontaneous heating temperature can be maintained at 70-100 ℃.
In the embodiment, the heater 2 is used for heating the water in the standard sample groove 5, so that the water environment in the standard sample groove 5 can be maintained at 30-50 ℃, and the simulation of the water environment temperature of the dead pool is realized.
Example 2:
as shown in fig. 1 and 2, in this embodiment, based on embodiment 1, the system further includes a temperature control system, where the temperature control system includes a controller, an electromagnetic valve, a temperature controller, and a temperature sensor, and the cold water inlet pipe 7 and the hot water inlet pipe 8 are both provided with electromagnetic valves;
the temperature controller is used for collecting a temperature signal measured by the thermocouple 3 and transmitting the temperature signal to the controller;
the temperature sensor is used for acquiring a temperature signal of the water environment in the standard sample groove 5 and transmitting the temperature signal to the controller;
the controller is used for receiving temperature signals of the temperature controller and the temperature sensor, and analyzing and judging whether to open the electromagnetic valve on the cold water inlet pipe 7 or the hot water inlet pipe 8.
The working process of the embodiment is as follows:
1) firstly, heating water in a heating water tank 9 to 30-50 ℃ to keep the water temperature, when a test is started, manually opening an electromagnetic valve to put the water into a standard sample groove 5 for the first time, and after the standard sample groove 5 is filled with the water, closing the electromagnetic valve to convert the water into automatic control;
2) the controller opens the cold and hot water electromagnetic valve to regulate the water temperature of the standard sample groove 5 according to the water temperature condition of the standard sample groove 5, and controls the water temperature to be 30-50 ℃;
example 3:
as shown in fig. 1 and fig. 2, the present embodiment is based on embodiment 1, and further includes a stirring device, where the stirring device includes a circulation pump and a circulation pump variable frequency controller, and the circulation pump is used to stir the water environment in the standard sample tank 5; the circulating pump frequency conversion controller is used for adjusting the output flow of the circulating pump.
Example 4:
as shown in fig. 1 and fig. 2, this embodiment is based on embodiment 2, and further includes a control box 10, the heating water tank 9 is disposed at the top of the control box 10, the control box 10 is used for installing a control component, the standard sample groove 5 and the control box 10 are integrally disposed on a base, and a locking wheel is disposed at the bottom of the base.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The heating device for simulating different temperature control of the fuel rod-spent pool is characterized by comprising a standard rod for simulating the fuel rod and a heating mechanism for simulating spent pool coolant;
the standard sample rod comprises a heater (2) and a cladding tube (1), the heater (2) is arranged on the inner side of the cladding tube (1), and two ends of the cladding tube (1) and the outer wall of the heater (2) are packaged through waterproof high-temperature-resistant materials;
the heater (2) comprises a metal tube, a heating body and a filling material are arranged in the metal tube, the heating body and the filling material are respectively Cr20Ni80 and hexagonal boron nitride, the heater (2) is led out through a lead-out wire (4), and a thermocouple (3) is arranged on the outer wall of the cladding tube (1);
the heating mechanism comprises a standard sample groove (5) and a standard sample rod mounting rack (6);
the standard sample groove (5) is used for providing a water environment, a cold water inlet pipe (7), a hot water inlet pipe (8) and a water outlet pipe are arranged on the standard sample groove (5), and the cold water inlet pipe (7) and the hot water inlet pipe (8) are respectively used for supplementing cold water and hot water into the standard sample groove (5);
the sample rod mounting rack (6) is mounted at the top of the sample groove (5), and the sample rod mounting rack (6) is used for mounting a sample rod.
2. The heating device for simulating different temperature control of a fuel rod-spent pool according to claim 1, further comprising a heating water tank (9), wherein the heating water tank (9) is connected with the hot water inlet pipe (8), and the heating water tank (9) is used for heating water inside the heating water tank.
3. The heating device for simulating different temperature control of the fuel rod-spent pool according to claim 1, further comprising a temperature control system, wherein the temperature control system comprises a controller, an electromagnetic valve, a temperature controller and a temperature sensor, and the electromagnetic valves are arranged on the cold water inlet pipe (7) and the hot water inlet pipe (8);
the temperature controller is used for collecting a temperature signal measured by the thermocouple (3) and transmitting the temperature signal to the controller;
the temperature sensor is used for acquiring a temperature signal of the water environment in the standard sample groove (5) and transmitting the temperature signal to the controller;
the controller is used for receiving temperature signals of the temperature controller and the temperature sensor, and analyzing and judging whether to open the electromagnetic valve on the cold water inlet pipe (7) or the hot water inlet pipe (8).
4. The heating device for simulating different temperature control of the fuel rod-spent pool according to claim 1, further comprising a stirring device, wherein the stirring device comprises a circulating pump, and the stirring of the water environment in the standard sample groove (5) is realized through the circulating pump.
5. The heating device for simulating different temperature control of a fuel rod-spent pool according to claim 4, wherein the stirring device further comprises a circulating pump variable frequency controller for adjusting the output flow of the circulating pump.
6. The heating device for simulating different temperature control of a fuel rod-spent pool according to claim 1, wherein the standard rod mounting rack (6) is detachably mounted at the top of the standard groove (5), and the standard rod mounting rack (6) is provided with mounting holes for mounting the standard rod.
7. The heating device for simulating different temperature control of a fuel rod-spent pool according to claim 1, wherein the heater (2) is made of 304 stainless steel.
8. The heating device for simulating different temperature control of the fuel rod-spent pool according to claim 1, further comprising a control box (10), wherein the heating water tank (9) is arranged at the top of the control box (10), and the control box (10) is used for installing a control assembly.
9. The heating device for simulating different temperature control of a fuel rod-spent pool according to claim 8, wherein the standard sample groove (5) and the control box (10) are integrally arranged on a base, and a locking wheel is arranged at the bottom of the base.
10. The heating device for simulating different temperature control of a fuel rod-spent pool according to any one of claims 1 to 9, wherein the waterproof high temperature resistant material is a silica gel pad and is encapsulated with epoxy resin at the end part, the heat conducting material between the sample rod and the heater is hexagonal boron nitride, the thermocouple (3) is a K-type armored thermocouple, and the lead-out wire (4) is a temperature resistant tetrafluoro lead-out wire.
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| CN202011178735.5A CN112361948B (en) | 2020-10-29 | 2020-10-29 | Heating device for simulating different temperature control of fuel rod-spent pool |
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| CN202011178735.5A CN112361948B (en) | 2020-10-29 | 2020-10-29 | Heating device for simulating different temperature control of fuel rod-spent pool |
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| CN115980178A (en) * | 2022-12-23 | 2023-04-18 | 中国核动力研究设计院 | Fuel rod oxidation film standard sample assembly and preparation method and application thereof |
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