CN111537392A - System and method for measuring flow characteristics of high-temperature molten material - Google Patents
System and method for measuring flow characteristics of high-temperature molten material Download PDFInfo
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- CN111537392A CN111537392A CN202010407161.8A CN202010407161A CN111537392A CN 111537392 A CN111537392 A CN 111537392A CN 202010407161 A CN202010407161 A CN 202010407161A CN 111537392 A CN111537392 A CN 111537392A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/006—Determining flow properties indirectly by measuring other parameters of the system
- G01N2011/0093—Determining flow properties indirectly by measuring other parameters of the system thermal properties
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Abstract
The invention discloses a system and a method for measuring the flow characteristics of high-temperature melt, wherein the measuring system comprises a melt releasing device, a flow channel, a thermocouple, a signal processor, a data acquisition board and a computer terminal; the invention provides a precondition for measuring the flow characteristics of the high-temperature melt by establishing the three-dimensional arrangement of the thermocouples with different densities; after the three-dimensional arrangement of the thermocouples is finished, the state that the melt is far away from, close to or in contact with the thermocouple 3 can be judged by measuring the temperature change condition of the thermocouples; drawing a flow form graph according to the change condition of the temperature of the thermocouple, and further drawing the flow form of the high-temperature melt; and then obtaining the flow characteristic of the high-temperature melt by analyzing the flow pattern. Compared with the existing scale measurement or three-dimensional imaging measurement, the thermocouple measurement used by the invention improves the accuracy and reliability of the measurement of the fluidity of the reactor core melt.
Description
Technical Field
The invention relates to the technical field of reactor core melt fluidity measurement, in particular to a high-temperature melt flow characteristic measurement system and a high-temperature melt flow characteristic measurement method.
Background
In the process of researching the serious accident of the core melting, a flow experiment of the fusant needs to be carried out, the flow characteristic of the fusant is a key parameter for researching and developing the serious accident mitigation control measure, and if the measurement is inaccurate, the serious accident mitigation control measure can fail, so that serious consequences are brought. In melt flow experiments, the temperature of the melt is up to 3000 ℃, and a large amount of 'steam fog' is generated when the high-temperature melt flows on the cement ground. The use of conventional measurement means for measuring the flow characteristics of the melt has some disadvantages. When a scale is used, the scale cannot measure flow characteristics at high temperatures due to the temperature of the melt being as high as 3000 ℃. When three-dimensional imaging measurement is adopted, because the melt can have violent reaction with cement when flowing on the cement ground, a large amount of 'steam fog' is generated, and the 'steam fog' shaped substances can influence the flow imaging of the high-temperature melt and are not easy to accurately measure. Therefore, there is a need to develop a new method for measuring the flow characteristics of high-temperature melt by creating a new concept for measuring the flow characteristics of high-temperature melt.
Disclosure of Invention
The invention aims to provide a high-temperature molten material flow characteristic measuring system and a high-temperature molten material flow characteristic measuring method, so as to improve the accuracy and reliability of the measurement of the fluidity of molten core material.
The invention is realized by the following technical scheme:
the high-temperature melt flow characteristic measuring system comprises a melt releasing device, a flow channel, a thermocouple, a signal processor, a data acquisition board and a computer terminal;
the melt releasing device is used for releasing high-temperature melt into the runner;
the runner is used for passing through high-temperature melt, a plurality of thermocouples are uniformly arranged at intervals at the bottom and the side wall of the runner, and the thermocouples are connected with the signal processor;
the signal processor is used for acquiring a temperature signal of the thermocouple and transmitting the temperature signal to the data acquisition board;
the data acquisition board converts the temperature signal into a position signal of the high-temperature melt and transmits the position signal to the computer terminal;
and the computer terminal is used for displaying the position signal of the high-temperature melt and drawing a flow state diagram of the high-temperature melt at the moment of the current position signal.
The invention provides a precondition for measuring the flow characteristics of the high-temperature melt by establishing the three-dimensional arrangement of the thermocouples with different densities; after the three-dimensional arrangement of the thermocouples is finished, the state that the melt is far away from, close to or in contact with the thermocouples can be judged by measuring the temperature change condition of the thermocouples; drawing a flow form graph according to the change condition of the temperature of the thermocouple, and further drawing the flow form of the high-temperature melt; and then obtaining the flow characteristic of the high-temperature melt by analyzing the flow pattern.
Compared with the existing scale measurement or three-dimensional imaging measurement, the thermocouple measurement used by the invention improves the accuracy and reliability of the measurement of the fluidity of the reactor core melt.
Further, the distance between thermocouples at the bottom of the runner is determined according to the resolution precision requirement of the flow front displacement of the high-temperature melt; the distance between the thermocouples on the side wall of the flow channel is determined according to the resolution precision of the stacking height of the high-temperature melt in the flowing process.
For example, the resolution precision requirement of the melt flow front displacement is 1cm, and the thermocouple arrangement distance at the bottom of the runner is 1 cm; the resolution precision of the accumulation height of the melt in the flowing process is 0.5cm, and the vertical distance between thermocouples on the side wall of the flow channel is 0.5 cm.
Furthermore, the thermocouple is connected with the signal processor through a cable, and the data acquisition board is connected with the computer terminal through a cable.
Further, the flow channel is of a groove-shaped structure.
Further, the flow channel is a rectangular groove.
The regular rectangular groove structure is beneficial to arranging the thermocouples.
A measurement method based on a high-temperature melt flow characteristic measurement system comprises the following steps:
1) arranging a thermocouple in the flow channel, connecting the thermocouple with a signal processor, connecting the signal processor with a data acquisition board, and connecting the data acquisition board with a computer terminal;
2) electrifying the signal processor, the data acquisition board and the computer terminal;
3) releasing the high-temperature melt by the melt releasing device, enabling the high-temperature melt to flow in the flow channel, collecting a temperature signal by the thermocouple in the flowing process, and judging the position of the high-temperature melt according to the temperature signal, namely when the temperature of the thermocouple is basically unchanged, indicating that the high-temperature melt is far away from the thermocouple; the thermocouple temperature started to rise slowly, indicating that the high temperature melt was approaching the thermocouple; the thermocouple temperature rises sharply, indicating that the high temperature melt contacts the thermocouple;
4) the computer terminal draws a flow state diagram of the high-temperature melt at the current position moment, continuously generates signals through the continuous flow of the high-temperature melt, continuously draws a moment flow state diagram of the high-temperature melt, and finally obtains all high-temperature flow state diagrams of the high-temperature melt in the measuring time;
5) and calculating according to a formula h, delta t and v, delta S, delta t to obtain the change rate of the stacking height and the front edge speed of the high-temperature melt, wherein h is the change rate of the stacking height, delta h is the height difference in a delta t time period, delta S is the displacement difference in the delta t time period, and delta t is the measurement time period.
The measuring method comprises a thermocouple three-dimensional arrangement method, a melt position judging method, a flow form drawing method and a flow characteristic calculating method, wherein the thermocouple three-dimensional arrangement method provides a precondition for measuring the flow characteristic of the melt by establishing thermocouple three-dimensional arrangement with different densities; after the three-dimensional arrangement of the thermocouples is finished, the melt position determination method can determine that the melt is in a state of being far away from, close to or contacting the thermocouples by measuring the change condition of the temperature of the three-dimensional thermocouples; the flow form drawing method is characterized in that a temperature rise curve of a thermocouple is monitored in real time, a melt position judging method is combined, a flowing position signal of a high-temperature melt is obtained through signal conversion, and a high-temperature melt flow form map is drawn; the flow characteristic calculation method obtains the flow characteristic of the high-temperature melt by analyzing the flow form map of the high-temperature melt, calculating the change rate of the stacking height by adopting h-delta h/. DELTA.t, and calculating the front edge speed by adopting v-delta S/. DELTA.t, and drawing the flow form map into animation.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method for measuring the flow characteristics of the high-temperature melt does not depend on macroscopic measurement such as scales or camera shooting, has low requirement on the measured environment, and obtains the flow characteristics with high accuracy and reliability. The method for measuring the flow characteristics of the high-temperature molten material has wide applicability and can be popularized from the field of serious accidents of the reactor core to the field of general high-temperature object flow.
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 flow diagram of a high temperature melt flow characteristic measurement system;
FIG. 2 is a graph showing the temperature change of a thermocouple;
FIG. 3 is a schematic diagram of a method for calculating the rate of change of the pile height and the velocity of the leading edge.
Reference numbers and corresponding part names in the drawings:
1-a melt releasing device, 2-a runner, 3-a thermocouple, 4-a signal processor, 5-a data acquisition board and 6-a computer terminal.
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 to 3, the high-temperature melt flow characteristic measurement system includes a melt releasing device 1, a flow channel 2, a thermocouple 3, a signal processor 4, a data acquisition board 5 and a computer terminal 6, wherein the thermocouple 3 is connected with the signal processor 4 through a cable, and the data acquisition board 5 is connected with the computer terminal 6 through a cable;
the melt releasing device 1 is used for releasing high-temperature melt into the runner 2;
the runner 2 is used for passing through high-temperature melt, the runner 2 is a rectangular groove, a plurality of thermocouples 3 are uniformly arranged at intervals on the bottom and the side wall of the runner 2, the thermocouples 3 are connected with a signal processor 4, and the distance between the thermocouples 3 at the bottom of the runner 2 is determined according to the resolution precision requirement of the flow front displacement of the high-temperature melt; the distance between thermocouples 3 on the side wall of the runner 2 is determined according to the resolution precision of the stacking height of the high-temperature melt in the flowing process, for example, the resolution precision requirement of the flow front displacement of the melt is 1cm, and the arrangement distance between the thermocouples at the bottom of the runner is 1 cm; the resolution precision of the accumulation height of the melt in the flowing process is 0.5cm, and the vertical distance between thermocouples on the side wall of the runner is 0.5 cm;
the signal processor 4 is used for acquiring a temperature signal of the thermocouple 3 and transmitting the temperature signal to the data acquisition board 5;
the data acquisition board 5 converts the temperature signal into a position signal of the high-temperature melt and transmits the position signal to the computer terminal 6;
and the computer terminal 6 is used for displaying the position signal of the high-temperature melt and drawing a flowing state diagram of the high-temperature melt at the moment of the current position signal.
A measuring method based on the high-temperature melt flow characteristic measuring system of embodiment 1, comprising the steps of:
1. arranging a thermocouple 3 in the runner 2, connecting the thermocouple 3 with a signal processor 4, connecting the signal processor 4 with a data acquisition board 5, and connecting the data acquisition board 5 with a computer terminal 6;
2. electrifying the signal processor 4, the data acquisition board 5 and the computer terminal 6;
3. releasing the high-temperature melt by the melt releasing device 1, enabling the high-temperature melt to flow in the runner 2, acquiring a temperature signal by the thermocouple 3 in the flowing process, judging the position of the high-temperature melt according to the temperature signal, and indicating that the high-temperature melt is far away from the thermocouple 3 when the temperature of the thermocouple 3 is basically unchanged; thermocouple 3 temperature begins to rise slowly, indicating that high temperature melt is approaching thermocouple 3; the temperature of the thermocouple 3 rises sharply, indicating that the high-temperature melt contacts the thermocouple 3;
4. the computer terminal 6 draws a flow state diagram of the high-temperature melt at the current position moment, continuously generates signals through the continuous flow of the high-temperature melt, and the computer terminal 6 continuously draws a moment flow state diagram of the high-temperature melt to finally obtain all high-temperature flow state diagrams of the high-temperature melt in the measuring time;
5. and calculating according to a formula h, delta t and v, delta S, delta t to obtain the change rate of the stacking height and the front edge speed of the high-temperature melt, wherein h is the change rate of the stacking height, delta h is the height difference in a delta t time period, delta S is the displacement difference in the delta t time period, and delta t is the measurement time period.
In the embodiment, the three-dimensional arrangement of the thermocouples 3 with different densities is established, so that a precondition is provided for measuring the flow characteristics of the high-temperature melt; after the three-dimensional arrangement of the thermocouples 3 is completed, the state that the melt is far away from, close to or in contact with the thermocouples 3 can be judged by measuring the temperature change condition of the thermocouples 3; drawing a flow form graph according to the change condition of the temperature of the thermocouple, and further drawing the flow form of the high-temperature melt; and then obtaining the flow characteristic of the high-temperature melt by analyzing the flow pattern.
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 (6)
1. The high-temperature melt flow characteristic measuring system is characterized by comprising a melt releasing device (1), a flow channel (2), a thermocouple (3), a signal processor (4), a data acquisition board (5) and a computer terminal (6);
the melt releasing device (1) is used for releasing high-temperature melt into the runner (2);
the runner (2) is used for passing through high-temperature melt, a plurality of thermocouples (3) are uniformly arranged at intervals on the bottom and the side wall of the runner (2), and the thermocouples (3) are connected with the signal processor (4);
the signal processor (4) is used for acquiring a temperature signal of the thermocouple (3) and transmitting the temperature signal to the data acquisition board (5);
the data acquisition board (5) converts the temperature signal into a position signal of the high-temperature melt and transmits the position signal to the computer terminal (6);
and the computer terminal (6) is used for displaying the position signal of the high-temperature melt and drawing a flow state diagram of the high-temperature melt at the current position signal moment.
2. A high temperature melt flow characteristic measurement system according to claim 1, wherein the spacing of thermocouples (3) at the bottom of the runner (2) is determined according to the resolution accuracy requirement of the high temperature melt flow front displacement; the distance between thermocouples (3) on the side wall of the runner (2) is determined according to the resolution precision of the stacking height of the high-temperature melt in the flowing process.
3. A high temperature melt flow characteristic measurement system according to claim 1, wherein the thermocouple (3) is connected to the signal processor (4) by a cable, and the data acquisition board (5) is connected to the computer terminal (6) by a cable.
4. A high temperature melt flow characteristic measurement system according to claim 1, wherein the flow channel (2) is of a trough-like configuration.
5. A high temperature melt flow characteristic measurement system according to claim 4, wherein the flow channel (2) is a rectangular slot.
6. A measuring method based on the high-temperature molten material flow characteristic measuring system of any one of claims 1 to 5, characterized by comprising the steps of:
1) arranging a thermocouple (3) in the flow channel (2), connecting the thermocouple (3) with a signal processor (4), connecting the signal processor (4) with a data acquisition board (5), and connecting the data acquisition board (5) with a computer terminal (6);
2) electrifying the signal processor (4), the data acquisition board (5) and the computer terminal (6);
3) releasing the high-temperature melt by the melt releasing device (1), enabling the high-temperature melt to flow in the runner (2), acquiring a temperature signal by a thermocouple (3) in the flowing process, and judging the position of the high-temperature melt according to the temperature signal;
4) the computer terminal (6) draws a flow state diagram of the high-temperature melt at the current position moment, signals are continuously generated through the continuous flow of the high-temperature melt, the computer terminal (6) continuously draws a flow state diagram of the high-temperature melt at the moment, and finally all high-temperature flow state diagrams of the high-temperature melt in the measuring time are obtained;
5) and calculating according to a formula h, delta t and v, delta S, delta t to obtain the change rate of the stacking height and the front edge speed of the high-temperature melt, wherein h is the change rate of the stacking height, delta h is the height difference in a delta t time period, delta S is the displacement difference in the delta t time period, and delta t is the measurement time period.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010407161.8A CN111537392A (en) | 2020-05-14 | 2020-05-14 | System and method for measuring flow characteristics of high-temperature molten material |
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| CN202010407161.8A CN111537392A (en) | 2020-05-14 | 2020-05-14 | System and method for measuring flow characteristics of high-temperature molten material |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000146995A (en) * | 1998-11-11 | 2000-05-26 | Japan Nuclear Cycle Development Inst States Of Projects | Channel for measurement of flow velocity of molten body |
| CN104568724A (en) * | 2015-02-10 | 2015-04-29 | 东南大学 | Method for measuring corrosion rate of sacrificial concrete |
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2020
- 2020-05-14 CN CN202010407161.8A patent/CN111537392A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000146995A (en) * | 1998-11-11 | 2000-05-26 | Japan Nuclear Cycle Development Inst States Of Projects | Channel for measurement of flow velocity of molten body |
| CN104568724A (en) * | 2015-02-10 | 2015-04-29 | 东南大学 | Method for measuring corrosion rate of sacrificial concrete |
Non-Patent Citations (1)
| Title |
|---|
| B.EPPINGER等: "Experiment on Concrete Erosion by a Corium Melt in the EPR Reactor Cavity: KAPOOL 6-8", 《FORSCHUNGSZENTRUM KARLSRUHE GMBH》 * |
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