CN110933780A - Linear heat source safety assessment experiment platform - Google Patents
Linear heat source safety assessment experiment platform Download PDFInfo
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- CN110933780A CN110933780A CN201911131456.0A CN201911131456A CN110933780A CN 110933780 A CN110933780 A CN 110933780A CN 201911131456 A CN201911131456 A CN 201911131456A CN 110933780 A CN110933780 A CN 110933780A
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- metal
- current lead
- resistance wire
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- heat source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
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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
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
Abstract
A linear heat source safety assessment experiment platform is of a metal tubular structure, and an inner cavity of a metal tube is an experiment cavity (15). One end of the first current lead (1) is connected with the anode of a power supply, and the other end of the first current lead (1) is connected with one end of the metal resistance wire (6); one end of the second voltage lead (14) is connected with the negative electrode of the power supply, and the other end of the second voltage lead (14) is connected with the other end of the metal resistance wire (16). The transfusion port (7), the liquid outlet (12), the safety valve (9), the explosion valve (10) and ten pressure sensors (P1-P10) are fixed on the experiment cavity (15) and are communicated with the inside of the experiment cavity (15). The metal resistance wire (6), the first current lead (1), the second current lead (14) and the power supply form a closed circuit, and the heat productivity of the metal resistance wire (6) is controlled by adjusting the output voltage of the power supply.
Description
Technical Field
The invention relates to a linear heat source safety assessment experiment platform.
Background
The superconducting energy pipeline is a novel energy transmission system for integrally transmitting electric energy and liquid fuel, the system utilizes the cold energy of a mixed working medium based on Liquefied Natural Gas (LNG) to cool a superconductive direct current cable electrified conductor to realize power transmission, and meanwhile, the LNG is used as fuel to transmit, so that the integrated transmission of power transmission/fuel transmission is realized. Compared with the conventional LNG independent transmission and the conventional electric power transmission, the LNG independent transmission system has the advantages that the transmission efficiency can be greatly improved, and the LNG independent transmission system has very remarkable advantages. Due to the possibility of combustion and even explosion of the gasified LNG, in order to realize the electric power/LNG transmission of the superconducting direct current energy pipeline, the heat conduction, the electrical performance, the safety performance and the like of the mixed working medium based on the LNG are required to be evaluated.
Disclosure of Invention
The invention aims to provide a linear heat source safety evaluation experiment platform to meet the research requirements of mixed working medium heat conduction, electricity, safety and the like based on LNG.
The invention generates linear heating under the conditions of simulating the quench of the superconducting direct current cable and the like in the closed container to form a linear heat source, so that the pressure change and the propagation rule generated in the liquid dielectric medium after the liquid dielectric medium is gasified can be used for experimental research of safety performance evaluation of the mixed working medium based on LNG in the sealed environment under the condition of the quench of the superconducting direct current cable.
The invention adjusts the current generated by the metal resistance wire by adjusting the voltage of the power supply so as to adjust the generated Joule heat and realize the purpose of controllable heat productivity.
The technical scheme adopted by the invention is as follows.
The experimental platform for evaluating the safety of the line heat source is a metal tube and comprises a current lead, a flange, a fixing bolt, an insulating structural part, a metal resistance wire, a liquid infusion port, a liquid outlet and ten pressure sensors, wherein the liquid infusion port, the liquid outlet and the ten pressure sensors are fixed on the metal tube and are communicated with the inner cavity of the metal tube. Switch valves are arranged at the transfusion port and the liquid outlet and are used for controlling the flow. The metal pipe is provided with a safety valve and a blasting valve, and ten pressure sensors are uniformly distributed on the inner wall of the upper part of the metal pipe. The inner cavity of the metal tube is an experimental cavity.
The experimental cavity is connected with the outside through a metal flange at the left end of the experimental cavity.
One end of the first current lead is connected with the anode of the power supply, and the other end of the first current lead is connected with one end of the metal resistance wire; the negative electrode of a power supply at one end of the second current lead is connected, and the other end of the second current lead is connected with the other end of the metal resistance wire; the metal resistance wire and the current lead are connected to form a heating loop, and the heating loop and an external power supply form a heating system. One end of the experimental cavity is provided with a metal flange. The first current lead and the second current lead are respectively and fixedly connected with the metal flange through an insulating structural part; the first metal flange is connected with the second metal flange in a sealing mode through the fixing bolt.
The pressure sensor is used for measuring the pressure change and the pressure propagation condition of the liquid medium to be measured in the inner cavity of the metal pipe.
The linear heat source safety evaluation experiment platform is arranged in a container when working, and is supported by a first heat insulation supporting piece and a second heat insulation supporting piece in the container, and the first heat insulation supporting piece and the second heat insulation supporting piece are arranged at the bottom of the container. Before the experiment is started, liquid dielectric medium to be measured is injected into the experiment cavity through the infusion port, and the infusion speed is controlled through switch valves arranged at the infusion port and the liquid outlet. And after the experiment is finished, discharging the liquid dielectric medium to be measured through the liquid outlet. The container is filled with the liquid dielectric medium which is the same as the material of the liquid dielectric medium to be measured and has the same temperature, so that the temperature of the experimental cavity is kept basically the same as that of the outside.
The metal resistance wire is parallel to the axis of the experimental cavity. The metal resistance wire and the current lead are connected to form a heating loop, and the heating loop and an external power supply form a heating system. The metal resistance wire generates heat under the action of current to form a wire heat source, so that the heating condition generated by quench of the superconducting direct current cable is simulated. The pressure sensor measures pressure change and propagation data of a liquid dielectric medium to be measured of the line heat source in the experimental cavity so as to research pressure change and propagation rules of mixed working media of LNG in a sealed environment under the condition that the superconducting direct current cable is quenched.
The liquid dielectric medium comprises low-temperature liquid dielectric medium such as LN2, LNG, CF4 and mixtures thereof, and can also be a normal-temperature insulating oil medium.
Description of the drawings:
FIG. 1 is a schematic structural composition diagram of a safety evaluation experiment platform for a line heat source; in the figure: the device comprises a first current lead 1, a first insulating structural part 2, a first flange 3, a second flange 4, a fixing bolt 5, a metal resistance wire 6, a transfusion port 7, a switching valve 8, a safety valve 9, a blasting valve 10, a heat-insulating support 11, a liquid outlet 12, a switching valve 13, a second current lead 14, an experimental cavity 15, a second insulating structural part 16 and a container 17.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The experimental platform for evaluating the safety of the line heat source is a metal pipe and comprises two current leads 1 and 14, two flanges 3 and 4, a fixing bolt 5, two insulating structural members 2 and 16, a metal resistance wire 6, a liquid infusion port 7, a liquid outlet 12, a safety valve 9, a blast valve 10 and ten pressure sensors P1-P10. A first switch valve 8 is installed on the infusion port 7, a second switch valve 13 is installed on the liquid outlet 12, and the first switch valve 8 and the second switch valve 13 are used for controlling flow. Ten pressure sensors P1-P10 were mounted on the inner wall of the upper part of the metal tube. The inner cavity of the metal tube is a laboratory cavity 15, and the transfusion port 7, the liquid outlet 12, the safety valve 9, the explosion valve 10 and ten pressure sensors P1-P10 are uniformly distributed on the laboratory cavity 15 and are communicated with the inside of the laboratory cavity 15.
One end of the first current lead 1 is connected with the anode of a power supply, and the other end of the first current lead is connected with one end of the metal resistance wire 6; one end of the second current lead 14 is connected with the negative electrode of the power supply, and the other end of the second current lead 14 is connected with the other end of the metal resistance wire 6. The power source is placed on the ground outside the container 17.
The metal resistance wire 6, the first current lead 1, the second current lead 14 and the power supply form a closed circuit, and the heat productivity of the metal resistance wire 6 is adjusted by adjusting the output voltage of the power supply, so that the heat energy is controlled.
The left end of the experimental cavity 15 is provided with a metal flange: a first flange 3 and a second flange 4. The second metal flange 4 seals the left end of the test chamber 15. The peripheries of the first current lead 1 and the second current lead 14 are respectively sleeved with a first insulating structural member 2 and a second insulating structural member 16, one ends of the first current lead 1 and the first insulating structural member 2, and one ends of the second current lead 14 and the second insulating structural member 16 penetrate through the first metal flange 3 and the second metal flange 4 to be connected with a power supply. A first current lead 1 and one end of a first insulating structural member 2, and a second current lead 14 and a second insulating structural member 16 are fixedly connected to the first metal flange 3; the first metal flange 3 is connected with the second metal flange 4 in a sealing mode through fixing bolts 5.
The current leads 1 and 5 are formed by processing copper-based pipes, the insulating structural members 2 and 16 are respectively sleeved on the peripheries of the two current leads and are hermetically fixed on the first metal flange (3), and leakage under the pressure of 10MPa in the experimental cavity can be avoided.
Ten pressure sensors P1-P10 are uniformly distributed on the upper pipe wall of the experiment cavity 15 and are communicated with the inside of the experiment cavity 15; the pressure sensors P1-P10 are used for measuring the pressure change of the liquid dielectric medium to be measured in the experiment cavity of the line heat source and the data transmitted by the pressure change. The number of pressure sensors may be increased or decreased depending on the length of the test chamber 15.
The invention adjusts the heating value of the metal resistance wire 6 by adjusting the output voltage of the power supply in the closed circuit, thereby controlling the heating energy.
The experimental platform for evaluating the safety of the line heat source is placed in a container 17 when working, and is supported by a first heat insulation support 11 and a second heat insulation support 11 in the container 17, and the first heat insulation support and the second heat insulation support are arranged at the bottom of the container 17. The experimental platform of the present invention was operated submerged in a container 17 filled with a liquid dielectric medium. Before the experiment is started, liquid dielectric medium to be detected is injected into the experiment cavity 15 through the infusion port 7, and the infusion speed is controlled through the first switch valve 8 arranged on the infusion port 7 and the second switch valve 13 arranged on the liquid outlet 12. The metal resistance wire 6 generates heat under the action of current to form a wire heat source, and the heating condition generated by quench of the superconducting direct current cable is simulated; the pressure sensors P1-P10 measure the pressure change of the liquid dielectric medium to be measured in the experimental cavity of the line heat source and the data of the propagation of the pressure change. After the experiment is finished, the liquid dielectric medium to be measured is discharged through the liquid outlet 12. The container 17 contains a liquid dielectric medium which is the same as the material of the liquid dielectric medium to be measured and has the same temperature, so as to keep the temperature of the experimental cavity 15 basically the same as that of the outside.
The device has the advantages of high air pressure resistance level, high safety, low working temperature and the like, and is suitable for researching the pressure change, propagation and other laws of heat source heating formed after the high-temperature superconducting direct-current cable is quenched in liquid in a sealed space; the invention adjusts the heat productivity of the metal resistance wire 6 by adjusting the output voltage of the power supply in the closed circuit, thereby controlling the energy output and achieving the purpose of controlling the controllable heat energy.
Claims (3)
1. The utility model provides a line heat source security aassessment experiment platform which characterized in that: the wire heat source safety assessment experiment platform is a metal pipe and comprises two current leads (1, 14), two flanges (3, 4), a fixing bolt (5), two insulating structural parts (2, 16), a metal resistance wire (6), a transfusion port (7), a liquid outlet (12), a safety valve (9), a blast valve (10) and ten pressure sensors (P1-P10); a first switch valve (8) is arranged on the transfusion port (7), and a second switch valve (13) is arranged on the liquid outlet (12); ten pressure sensors (P1-P10) are arranged on the inner wall of the upper part of the metal pipe; the inner cavity of the metal tube is an experimental cavity (15); the transfusion port (7), the liquid outlet (12), the safety valve (9), the explosion valve (10) and ten pressure sensors (P1-P10) are fixed on the experiment cavity (15) and are communicated with the inside of the experiment cavity (15);
one end of the first current lead (1) is connected with the anode of a power supply, and the other end of the first current lead (1) is connected with one end of the metal resistance wire (6); one end of the second current lead (14) is connected with the negative electrode of the power supply, and the other end of the second current lead (14) is connected with the other end of the metal resistance wire (6); the metal resistance wire (6) is connected with the current leads (1, 14) to form a heating loop, and the heating loop and a power supply form a heating system; the heat productivity of the metal resistance wire (6) is adjusted by adjusting the output voltage of the power supply, so that the heat energy is controlled;
one end of the experiment cavity (15) is closed, and the other end is provided with metal flanges (3, 4); the first metal flange (3) is hermetically connected with the second metal flange (4) through a fixing bolt (5);
the two current leads (1, 14) are fixedly connected with the first metal flange (3) through insulating structural members (2, 16).
2. The wire heat source safety assessment experimental platform of claim 1, wherein: the peripheries of the first current lead (1) and the second current lead (14) are sleeved with a first insulating structural part (2) and a second insulating structural part (16) respectively; one end of a first current lead (1) and one end of a first insulating structural part (2), and one end of a second current lead (14) and one end of a second insulating structural part (16) penetrate through a first metal flange (3) and a second metal flange (4) to be connected with a power supply; one ends of the first current lead (1) and the first insulating structural member (2), and the second current lead (14) and the second insulating structural member (16 () are fixedly connected with the first metal flange (3).
3. The line heat source safety assessment experimental platform of claim 1 or 2, wherein: the experimental platform is placed in the container (17) during working and is supported by two heat-insulating supporting pieces in the container (17), and the two heat-insulating supporting pieces are arranged at the bottom of the container (17); the container (17) is internally filled with a liquid dielectric medium which has the same material and temperature as the liquid dielectric medium to be measured; before an experiment is started, a liquid dielectric medium to be detected is injected into an experiment cavity (15) through an infusion port (7), and the infusion speed is controlled through a first switch valve (8) arranged on the infusion port (7) and a second switch valve (13) arranged on a liquid outlet (12); the metal resistance wire (6) generates heat under the action of current to form a wire heat source, and the heating condition generated by the quench of the superconducting direct current cable is simulated; the pressure sensor (P1-P10) measures the pressure change of the liquid dielectric medium to be measured in the experimental cavity of the line heat source and the data of the propagation of the pressure change; after the experiment is finished, the liquid dielectric medium to be measured is discharged through the liquid outlet (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911131456.0A CN110933780B (en) | 2019-11-19 | 2019-11-19 | Linear heat source safety assessment experiment platform |
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| CN201911131456.0A CN110933780B (en) | 2019-11-19 | 2019-11-19 | Linear heat source safety assessment experiment platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988618A (en) * | 2019-11-19 | 2020-04-10 | 中国科学院电工研究所 | Point heat source safety assessment experiment platform |
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