CN108387637B - Experimental device and method for harmlessness of metal particles - Google Patents
Experimental device and method for harmlessness of metal particles Download PDFInfo
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- CN108387637B CN108387637B CN201810447540.2A CN201810447540A CN108387637B CN 108387637 B CN108387637 B CN 108387637B CN 201810447540 A CN201810447540 A CN 201810447540A CN 108387637 B CN108387637 B CN 108387637B
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Abstract
The invention provides a harmless experimental device and a harmless experimental method for metal particles, which can adjust the proportion and the pressure of mixed gas according to the requirement, and can perform various metal particle experiments at the same time, thereby realizing the metal particle experiments under different mixed gas environments. The device comprises: SF (sulfur hexafluoride) 6 The mixed gas charging, discharging and recycling device, the metal cavity, the electrode module, the adsorption device and the metal particle capturing device; the metal cavity is divided into a left air chamber and a right air chamber, both air chambers are provided with insulators, the right air chamber is provided with a metal particle capturing device, and the left air chamber is provided with an adsorption device; SF (sulfur hexafluoride) 6 The mixed gas charging, discharging and recycling device is connected to the left air chamber and the right air chamber of the metal cavity, and the electrode module is arranged in the metal cavity and is coaxial with the metal cavity. The invention can efficiently complete the harmless experiments of the metal particles in the mixed gas with different concentrations and pressures. Can complete the recycling of the mixed gas, improve the resource utilization and save the experiment cost, and can basically realize SF 6 Zero release to the atmosphere.
Description
Technical Field
The invention relates to the technical field of gas-insulated closed power transmission lines, in particular to an experimental device and method for harmlessly treating metal particles.
Background
The gas-insulated metal-enclosed transmission line (gas insulated metal enclosed transmission line, GIL) is applied as a novel transmission technology, and SF is adopted 6 Gas or SF 6 And N 2 High-voltage and high-current power transmission equipment with mixed gas insulation, shell and conductor coaxially arranged and with large transmission capacity, low loss and small occupied areaThe arrangement is flexible, the environment is friendly, and the like. From the seventh eighties of the 20 th century, GIL is put into practical use in a plurality of countries successively, and through the development and application of nearly half century, the voltage level of the transmission line is continuously improved, and the GIL transmission mode tends to be more mature and stable, so that the GIL transmission mode is widely applied worldwide.
However, problems also occur therewith. GIL on the one hand generates some metal scraps or particles during transportation, assembly and operation, and SF on the other hand 6 Gases also have some drawbacks: firstly, the liquefying temperature is high, the liquefying phenomenon is easy to generate when the device is used in cold seasons in winter in alpine regions, and the safe operation of power equipment is seriously threatened; SF is the second one 6 The gas is a very strong greenhouse gas, and the GWP value is equivalent to that of CO 2 23900 times, 1997, through the kyoto protocol, SF 6 The gas list is the gas which needs to be used by the global control; thirdly, the electric field in the power equipment is sensitive to non-uniformity; and fourthly, decomposition occurs under the continuous action of the high-temperature electric arc. The most effective method at present is to seek SF 6 The mixed gas is used as an insulating arc extinguishing medium, so that not only the liquefaction temperature of the insulating gas can be reduced, but also SF (sulfur hexafluoride) can be reduced 6 The amount of gas used. The design of the harmless experimental device and method for the metal particles reduces the harm of the metal particles to the greatest extent and ensures the safe and reliable operation of the GIL.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a harmless experimental device and a harmless experimental method for metal particles, which are characterized in that the device can work in a mixed gas environment, can adjust the proportion and the pressure of the mixed gas according to the needs, can perform various metal particle experiments, and realize the metal particle experiments in different mixed gas environments.
The technical scheme of the invention is as follows:
an experimental device for harmlessly treating metal particles, comprising: SF (sulfur hexafluoride) 6 The mixed gas charging, discharging and recycling device, the metal cavity, the electrode module, the adsorption device and the metal particle capturing device;
the metal cavity is divided into a left air chamber and a right air chamber, both air chambers are provided with an adsorption device and an insulator, and the right air chamber is provided with a metal particle capturing device; SF (sulfur hexafluoride) 6 The mixed gas charging, discharging and recycling device is connected to the left air chamber and the right air chamber of the metal cavity, and the electrode module is arranged in the metal cavity and is coaxial with the metal cavity.
The SF 6 The mixed gas charging, discharging and recycling device comprises SF storage 6 The SF (sulfur hexafluoride) gas storage device comprises a first high-pressure gas cylinder for storing gas, a second high-pressure gas cylinder for storing another gas, a mixed gas storage tank, a compressor, a filtering and absorbing device and a vacuum pump, wherein the first high-pressure gas cylinder and the second high-pressure gas cylinder are respectively connected with two air inlets of the mixed gas storage tank, and a gas flowmeter and an air valve are arranged on a connecting pipeline to realize SF (sulfur hexafluoride) 6 Mixing the gas with another gas in any ratio; one air outlet of the mixed gas storage tank is respectively connected with a condenser, a vacuum pump and a left air chamber and a right air chamber of the metal cavity, the condenser is connected with a compressor, the compressor is connected with a filter, the other air outlet of the mixed gas storage tank is connected into a connecting pipeline of the compressor and the filter, and the vacuum pump is connected with a filtering and absorbing device.
The metal cavity is cylindrical ground shell, and the top of left air chamber and right air chamber all is equipped with quartz window I, and the side of left air chamber and right air chamber all is equipped with quartz window II.
The electrode module comprises an external electrode lead and a high-voltage conductor; the high-voltage conductor is coaxial with the metal cavity, and one end of the high-voltage conductor is connected with the outside through the electrode lead.
The adsorption device comprises a placement box, a net-shaped bag and an adsorbent; a reticular bag is sleeved in the placement box, and an adsorbent is arranged in the reticular bag.
The metal particle capturing device comprises a driving electrode and a particle trap, wherein the driving electrode consists of four wedge-shaped electrodes with smooth curved surfaces, the particle trap is provided with three layers, and a metal aluminum plate with a groove, a hot melt adhesive coating and an epoxy resin insulating pad are sequentially arranged from top to bottom.
The two air outlets of the mixed gas storage tank are respectively provided with an air valve; the air inlet of the vacuum pump is provided with a vacuum meter, the air outlet of the vacuum pump 7 is connected with a filtering and absorbing device, the upper ends of the left air chamber and the right air chamber of the metal cavity are respectively provided with a vacuum meter, and the vacuum meters are respectively provided with air valves.
The electrode leads are connected with alternating voltage, direct voltage or impulse voltage.
And high-speed cameras are arranged outside the quartz window I and the quartz window II.
An experimental method for harmlessly treating metal particles based on the device comprises the following steps:
vacuumizing a mixed gas storage tank;
SF is carried out 6 Mixing with another gas;
vacuumizing the metal cavity;
filling the metal cavity with mixed gas to a set pressure value;
raising the voltage to the movement of the metal particles;
when the metal particles move to the insulator, the gas in the left gas chamber and the right gas chamber is recovered to a mixed gas storage tank, and the experiment is finished.
The invention has the beneficial effects that: compared with the prior art, the experimental device of the gas-insulated metal-enclosed transmission line has the following advantages:
1) And the blank of other metal particle experiments is made up, and the harmless experiments of the metal particles in the mixed gas with different concentrations and pressures are efficiently completed.
2) Can complete the recycling of the mixed gas, improve the resource utilization and save the experiment cost, and can basically realize SF 6 Zero release to the atmosphere.
3) The high-voltage conductor adopts a bolt structure, can be disassembled and replaced, and can efficiently carry out different metal particle experiments.
4) The cylindrical metal cavity is divided into two air chambers, so that the left air chamber and the right air chamber can be used for simultaneously carrying out experiments, and the efficiency of the experiments is improved. The adsorption device is arranged on the cylindrical metal cavity, and can adsorb the decomposition products of the mixed gas, so that the experimental result is more accurate.
Drawings
FIG. 1 is a schematic structural diagram of an experimental device for innocuous metal particles;
FIG. 2 is a block diagram of a removable conductor of the present invention;
FIG. 3 is a block diagram of a driving electrode according to the present invention;
FIG. 4 is a schematic diagram of a particle trap according to the present invention;
FIG. 5 is a process flow chart of the experimental method for harmlessly treating metal particles in embodiment 1 of the present invention;
wherein 1, a first high-pressure gas cylinder, 2, a second high-pressure gas cylinder, 3, a mixed gas storage tank, 4, a condenser, 5, a compressor, 6, a filter, 7, a vacuum pump, 8, a filtering and absorbing device, 9, quartz windows I,10, quartz windows II,11, a flange, 12, a high-pressure conductor, 13, a driving electrode, 14, an absorbing device, 15, a base, 16, a metal particle capturing device, 17, an insulator, 18, a grounding shell, 19, an electrode lead, 20, a separator, 21, a detachable conductor, 22, a wedge-shaped electrode, 23, a grooved metal aluminum plate, 24, a hot melt adhesive coating, 25 epoxy resin insulation pad, 26, a left air chamber, 27, a right air chamber, G1 and G2, a flow meter, G 3 Electric contact pressure gauge, G 4 And G 5 Vacuum gauge, G 6 Barometer, G 7 And G 8 And a vacuum gauge.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings.
The present embodiment provides an experimental apparatus for innocuous metal particles as shown in fig. 1, comprising: SF (sulfur hexafluoride) 6 The mixed gas charging, discharging and recycling device, a cylindrical metal cavity, an electrode module, an adsorption device 14 and a metal particle capturing device; the metal cavity is divided into a left air chamber 26 and a right air chamber 27 by a separation plate 20, the two air chambers are provided with an adsorption device 14 and a basin-type insulator 17, the right air chamber 27 is provided with a metal particle capturing device, and the two air chambers can respectively perform experiments without mutual interference; SF (sulfur hexafluoride) 6 The mixed gas charging, discharging and recycling device is connected to a left air chamber 26 and a right air chamber 27 of the metal cavity, and the electrode module is arranged in the metal cavity and is coaxial with the metal cavity. The metal cavity is placed by a base 15.
The SF 6 The mixed gas charging, discharging and recycling device comprises SF storage 6 A first gas cylinder 1 for storing another gas (for example N 2 ) The first high-pressure gas cylinder 1 and the second high-pressure gas cylinder 2 are respectively connected with two gas inlets of the mixed gas storage tank 3, and the connecting pipelines are respectively provided with gas flow meters (G1 and G2) and a gas valve (K) 1 、K 2 ) Realize SF 6 Mixing the gas with another gas in any ratio; one gas outlet of the mixed gas storage tank 3 is respectively connected with the condenser 4, the vacuum pump 7, the left gas chamber 26 and the right gas chamber 27 of the metal cavity, the condenser 4 is connected with the compressor 5, the compressor 5 is connected with the filter 6, the other gas outlet of the mixed gas storage tank 3 is connected into a connecting pipeline of the compressor 5 and the filter 6, and the vacuum pump 7 is connected with the filtering and absorbing device 8. And the connecting pipelines of the first high-pressure gas cylinder 1, the second high-pressure gas cylinder 2 and the mixed gas storage tank 3 are respectively provided with a gas flowmeter for controlling the quantity of gas entering the mixed gas storage tank 3 and realizing the mixing of the two gases. The compressor 5 is used for filling the mixed gas in the mixed gas storage tank 3 into the metal cavity, or recycling the mixed gas in the metal cavity into the mixed gas storage tank 3. The vacuum pump 7 is used for vacuumizing the metal cavity or the mixed gas storage tank 3.
The metal cavity is cylindric ground connection shell 18, and the top of left air chamber 26 and right air chamber 27 all is equipped with quartz window I (9), and the side of left air chamber 26 and right air chamber 27 all is equipped with quartz window II10, and two quartz windows II10 are installed respectively in the side of left air chamber 26 and right air chamber 27 through flange 11. The high-speed cameras are arranged outside the quartz window I9 and the quartz window II10 and used for observing test phenomena, and the high-speed cameras are started before the test is performed; the experimental conditions inside can be observed through the quartz window.
The electrode module comprises an external electrode lead 19 and a high voltage conductor 12; the high voltage conductor 12 is coaxial with the metal cavity, and one end of the high voltage conductor 12 is connected to the outside through an electrode lead 19. As shown in fig. 2, the high voltage conductor 12 is composed of a plurality of detachable conductors 21 connected. The electrode leads 19 are connected to an ac voltage, a dc voltage or a surge voltage.
The adsorption device 14 comprises a placement box, a net-shaped bag and an adsorbent; a reticular bag is sleeved in the placement box, and an adsorbent is arranged in the reticular bag.
The metal particle capturing device comprises a driving electrode 13 and a particle trap 16, wherein the driving electrode 13 is composed of four wedge-shaped electrodes 22 (shown in fig. 3) with smooth curved surfaces, as shown in fig. 4, the particle trap 16 comprises three layers, namely a metal aluminum plate 23 with grooves, a hot melt adhesive coating 24 and an epoxy resin insulating pad 25 in sequence from top to bottom.
The two air outlets of the mixed gas storage tank 3 are respectively provided with an air valve K 3 And K 4 Air valve K 3 The pipeline is used for filling the mixed gas in the mixed gas storage tank 3 into the left air chamber 26 and the right air chamber 27, and the process passes through the air valve K 3 Compressor 5, condenser 4, gas valve K 5 、K 7 、K 9 、K 10 Realizing; air valve K 4 The pipeline is provided with two branch pipelines, one of which passes through the air valve K 4 、K 5 And K 8 The direct communication of the mixed gas storage tank 3 and the vacuum pump 7 is controlled for vacuumizing the mixed gas storage tank 3, and the other branch pipe is sequentially connected with the condenser 4, the compressor 5 and the filter 6 and passes through the air valve K 6 、K 7 、K 9 、K 10 The mixed gas storage tank 3 is communicated with the cylindrical metal cavity, and is used for recycling the mixed gas in the cylindrical metal cavity into the mixed gas storage tank.
A vacuum gauge G is arranged at the air inlet of the vacuum pump 7 4 The air outlet of the vacuum pump 7 is connected with the filtering and absorbing device 8, and the upper ends of the left air chamber 26 and the right air chamber 27 of the metal cavity are provided with vacuum meters G 7 And G 8 ，G 7 And G 8 The upper parts are respectively provided with an air valve K 11 And K 12 For monitoring the pressure conditions of the gas entering the left and right chambers 26, 27. Barometer G 6 Is arranged on the air valve K 9 And K 10 Above, for detecting the pressure of the left air chamber 26 and the right air chamber 27 when the left air chamber and the right air chamber are pressurized and inflatedA strong value; the upper ends of the left air chamber 26 and the right air chamber 27 are respectively connected with an air valve K through an air pipeline 10 、K 9 And air valve K 7 、K 8 And the vacuum pump 7 is directly communicated and is used for realizing the recovery treatment of the gas.
An electric contact pressure gauge G is arranged on the mixed gas storage tank 3 3 When the electric contact pressure gauge G 3 The compressor 5 is automatically turned off when the detected gas pressure in the mixed gas storage tank 3 exceeds a set value.
The embodiment also provides an experimental method for harmlessly treating metal particles based on the device, and the flow is shown in fig. 5, and comprises the following steps:
starting the vacuum pump and sequentially opening the air valve K 6 、K 8 、K 4 、K 5 Vacuumizing the mixed gas storage tank, and taking the mixed gas as a vacuum gauge G 4 When the pointer reaches zero, the air valve K is closed in turn 5 、K 4 、K 6 、K 8 And a vacuum pump for completing the vacuumizing of the mixed gas storage tank 3;
respectively opening SF according to sequence 6 High-pressure gas cylinder for gas and another gas and K 1 And K 2 Mixing the mixed gas in a mixed gas storage tank according to a set proportion and a set pressure ratio, and standing for 24 hours to enable SF to be obtained 6 Thoroughly mixing with another gas;
starting the vacuum pump and sequentially opening the air valve K 10 、K 9 、K 7 、K 8 When the vacuum gauge G 4 When the pointer reaches 0, the air valve K is closed in turn 8 、K 7 And a vacuum pump for completing the vacuum pumping of the metal cavity;
opening the air valve K 3 、K 5 And K 7 Filling the mixed gas in the mixed gas storage tank into a cylindrical metal cavity through a compressor, filling the mixed gas into the metal cavity to a set pressure value, and watching the barometer G 6 After reaching the set pressure value, the air valve K is closed in turn 9 、K 10 、K 7 、K 5 、K 3 Opening the gas valve K 11 、K 12 ；
Turning on the high-speed camera, switching on the power supply, and slowly raising the voltage until the metal particles move;
when the metal particles move to the insulator, the high-speed camera and the power supply are turned off; after the measurement is completed, the air valve K is opened in sequence 10 、K 9 、K 7 、K 6 And K 4 Starting the compressor, recovering the gas in the left gas chamber 26 and the right gas chamber 27 to the mixed gas storage tank, and ending the experiment to recover SF in the mixed gas 6 The gas is evacuated after being treated.
Finish the experimental measurement and open the air valve K 8 Starting a vacuum pump and a filtering and absorbing device to perform SF (sulfur hexafluoride) on the mixed gas 6 The gas is evacuated after being treated.
Claims (10)
1. An experimental device for metal particle innocuity, which is characterized by comprising: SF6 mixed gas charging and discharging and recycling device, metal cavity, electrode module, adsorption device (14), metal particle catching device;
the metal cavity is divided into a left air chamber (26) and a right air chamber (27) through a separation plate (20), an insulator (17) is arranged in each of the two air chambers, a metal particle capturing device is arranged in each of the right air chambers (27), the metal particle capturing device comprises a particle trap (16), the particle trap (16) comprises three layers, and a metal aluminum plate (23) with a groove, a hot melt adhesive coating (24) and an epoxy resin insulating pad (25) are sequentially arranged from top to bottom;
the left air chamber (26) is provided with an adsorption device (14); the SF6 mixed gas charging, discharging and recycling device is connected to a left air chamber (26) and a right air chamber (27) of the metal cavity, an electrode module is arranged in the metal cavity and comprises a high-voltage conductor (12), and the high-voltage conductor (12) is formed by connecting a plurality of detachable conductors (21); the electrode module is coaxial with the metal cavity, and the metal cavity is horizontally arranged.
2. The device according to claim 1, wherein the SF6 mixed gas charging and discharging and recycling device comprises a first high-pressure gas cylinder (1) for storing SF6 gas, a second high-pressure gas cylinder (2) for storing another gas, a mixed gas storage tank (3), a compressor (5), a filtering and absorbing device (8) and a vacuum pump (7), the first high-pressure gas cylinder (1) and the second high-pressure gas cylinder (2) are respectively connected with two gas inlets of the mixed gas storage tank (3), and a gas flowmeter and a gas valve are arranged on a connecting pipeline to realize the mixing of SF6 gas and the other gas in any proportion; one gas outlet of the mixed gas storage tank (3) is respectively connected with a condenser (4), a vacuum pump (7), a left gas chamber (26) and a right gas chamber (27) of the metal cavity, the condenser (4) is connected with a compressor (5), the compressor (5) is connected with a filter (6), the other gas outlet of the mixed gas storage tank (3) is connected into a connecting pipeline of the compressor (5) and the filter (6), and the vacuum pump (7) is connected with a filtering and absorbing device (8).
3. The device according to claim 1, wherein the metal cavity is a cylindrical grounding shell (18), quartz windows I (9) are arranged above the left air chamber (26) and the right air chamber (27), and quartz windows II (10) are arranged on the sides of the left air chamber (26) and the right air chamber (27).
4. The device according to claim 1, characterized in that the high voltage conductor (12) is coaxial with the metal cavity, one end of the high voltage conductor (12) being connected to the outside via an electrode lead (19).
5. The device according to claim 1, characterized in that the adsorption means (14) comprise a placement box, a mesh bag and an adsorbent; a reticular bag is sleeved in the placement box, and an adsorbent is arranged in the reticular bag.
6. The device according to claim 1, characterized in that the metal particle capturing device comprises a driving electrode (13), the driving electrode (13) being composed of four wedge-shaped electrodes (22) with smooth curved surfaces.
7. The device according to claim 2, characterized in that gas valves are respectively arranged at the two gas outlets of the mixed gas storage tank (3); the air inlet of the vacuum pump (7) is provided with a vacuum gauge, the air outlet of the vacuum pump (7) is connected with the filtering and absorbing device (8), the upper ends of the left air chamber (26) and the right air chamber (27) of the metal cavity are respectively provided with a vacuum gauge, and the vacuum gauges are respectively provided with an air valve.
8. The device according to claim 4, characterized in that the electrode leads (19) are connected to an alternating voltage, a direct voltage or a surge voltage.
9. A device according to claim 3, characterized in that the quartz window I (9), the quartz window II (10) are externally placed with high-speed cameras.
10. An experimental method for harmlessly treating metal particles based on the apparatus of claim 2, comprising:
vacuumizing a mixed gas storage tank (3);
mixing SF6 with another gas;
vacuumizing the metal cavity;
filling the metal cavity with mixed gas to a set pressure value;
raising the voltage to the movement of the metal particles;
when the metal particles move to the insulator, the gas in the left gas chamber (26) and the right gas chamber (27) is recovered to a mixed gas storage tank, and the experiment is finished.
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| CN110554254B (en) * | 2019-09-23 | 2021-02-02 | 华北电力大学 | Observing device for metal dust adsorption and accumulated charges of GIS or GIL equipment |
| CN113109062A (en) * | 2020-01-10 | 2021-07-13 | 平高集团有限公司 | Metal particle trap trapping test device and method |
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