Detection system and method of sulfur hexafluoride gas in outdoor substation space

Abstract

The present invention provides a system and method for detecting sulfur hexafluoride gas in a station space of an outdoor substation. The system comprises a cruising track arranged around sulfur hexafluoride electrical equipment, a cruising sampling vehicle is installed on the cruising track, a detection equipment room is arranged at the end of the cruising track, a Heliotech long-path gas pool detection system is installed in the detection equipment room, and an air collection and pressurization system for collecting sulfur hexafluoride gas is installed on the cruising sampling vehicle. The present invention has the advantages of high precision, strong anti-interference ability, good coordination with a long-path gas pool, and good detection effect for rarefied gas components.

Description

Technical Field

[0001] The present invention relates to the field of sulfur hexafluoride gas detection, and in particular to a system and method for detecting sulfur hexafluoride gas in a station space of an outdoor substation. Background Art

[0002] Sulfur hexafluoride gas is a gas with very stable chemical properties. It has good electrical insulation and switch arc extinguishing properties, stable long-term operating performance and less maintenance. It occupies a small area and is an excellent insulating material. It is widely used in power transmission and distribution and electronic manufacturing. However, sulfur hexafluoride is a typical greenhouse gas. It can cause specific long-wave radiation interception and reflection, become an insulating layer of the atmosphere, and cause environmental warming. Compared with the carbon transformation of carbon dioxide in the natural environment, it is a difficult-to-degrade substance and can cause long-term harm to the natural environment. Sulfur hexafluoride has a suffocating effect, and its decomposition products are complex and highly toxic, which can cause fatal harm to front-line personnel in the power industry.

[0003] At present, sulfur hexafluoride gas is widely used and used in large quantities. With social progress and economic development, the use of sulfur hexafluoride gas will be further increased, and its environmental protection performance and production safety have attracted widespread attention. Under pressurized conditions, the insulation and arc extinguishing performance of sulfur hexafluoride will be better. The sulfur hexafluoride gas used in the power system must be pressurized. When the equipment quality, installation process, and aging of sealing materials cause sulfur hexafluoride gas leakage, it will destroy the safe operating environment of the power equipment, which may cause huge production safety accidents and huge economic losses. At the same time, it will cause adverse social impacts, and the internationally accepted carbon emission rules have also made the emission control of greenhouse gases increasingly strict. Therefore, regular monitoring of sulfur hexafluoride gas used in power facilities will be an effective means to protect the environment and ensure safe production. Summary of the invention

[0004] The purpose of the present invention is to provide a detection system and method for sulfur hexafluoride gas in the station space of an outdoor substation. The detection of trace gases using a narrow-bandwidth monochromatic laser has the advantages of high precision, strong anti-interference ability, and good coordination with a long optical path gas cell, and has a good detection effect on rarefied gas components.

[0005] The technical solution of the present invention:

[0006] A detection system for sulfur hexafluoride gas in the station space of an outdoor substation. Sulfur hexafluoride electrical equipment is installed in the outdoor substation. A cruising track is arranged around the sulfur hexafluoride electrical equipment. A cruising sampling vehicle is installed on the cruising track. A detection equipment room is arranged at the end of the cruising track. A Helios long-path gas pool detection system is installed in the detection equipment room. An air collection and pressurization system for collecting sulfur hexafluoride gas is installed on the cruising sampling vehicle.

[0007] The air collection and pressurization system includes an air sampling head, which is connected to a coarse filter to perform preliminary filtration on the collected air, the coarse filter is connected to a fine filter, the fine filter is connected to a first oil-free air compressor, the oil-free air compressor is connected to a dehydrator, the dehydrator is connected to a first valve, the output end of the first valve is respectively connected to a second valve and a throttling dryer, the throttling dryer is connected to a third valve, the third valve is connected to a second oil-free air compressor, the air inlet and air outlet of the second oil-free air compressor are connected to two ends of a fourth valve, the second oil-free air compressor is connected to a fifth valve, the fifth valve is connected to a deaerator, the deaerator is connected to an air storage tank, the air storage tank is connected to a sixth valve, and a cooler is also connected to the top of the air storage tank.

[0008] The air sampling head includes a threaded joint that is convenient for connection with a pipeline. A collection channel is arranged on the air sampling head. An air inlet is opened on the top of the collection channel. The collection channel and the air inlet form a spherical shape at the end of the air sampling head that is convenient for collecting air from multiple directions.

[0009] The Helios long optical path gas pool detection system includes valve A and valve B. Valve B is connected to an air filter. The output end of the air filter is respectively connected to valve C and valve D. The output end of valve C is respectively connected to a Helios long optical path gas pool and valve E. Valve D and valve E are connected to a high-purity nitrogen bottle. Valve F is connected to the Helios long optical path gas pool.

[0010] The Heliotech long optical path gas cell includes a narrow line width infrared laser, a single beam infrared photometer, a gas cell pressure controller, a gas cell temperature control system, and a gas cell rotation system.

[0011] A method for detecting sulfur hexafluoride gas in the space of an outdoor substation, using the above-mentioned detection system for sulfur hexafluoride gas in the space of an outdoor substation, the method comprises the following specific steps:

[0012] Control the cruising sampling vehicle to drive the air collection and pressurization system to collect air around the sulfur hexafluoride electrical equipment in the outdoor substation;

[0013] When collecting air, open the first valve, the third valve and the fifth valve;

[0014] After the air collection is completed, the cruise sampling vehicle returns to the detection equipment room, closes the first valve, the third valve and the fifth valve, opens the sixth valve to flush the pipeline and then closes the sixth valve, opens valve E and valve F to fill the gas pool with nitrogen for cleaning, closes valve E, controls valve F, and the detection system adjusts the gas pool pressure, preheats and calibrates, and opens valve B and valve D to flush the pipeline;

[0015] Connect the outlet of the air collection and pressurization system to the inlet of the Heliotech long-path gas pool detection system, open the sixth valve, and inject the collected gas into the Heliotech long-path gas pool detection system;

[0016] Open valve A to exhaust and flush the pipeline, open valve B, valve C, and valve F to flush the pipeline, open valve B and valve C to inject samples into the gas pool, close valve C, control valve F to adjust pressure, control temperature, and prepare for testing, open valve B and valve D to fill the sampling system with nitrogen, and the system detects sulfur hexafluoride gas;

[0017] After the test is completed, open valves E and F to fill the gas pool with nitrogen for cleaning.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: after completing the sample collection, the device can carry the collector to the detection equipment room, and use the docking equipment matched with the detection equipment to transmit the sample, so that the sample can be collected by the detection equipment without pollution. The multi-directional air collection head can collect the gas in the nearby three-dimensional space without dead angles, which can avoid subjective sampling errors caused by single directionality to a certain extent. The Helios long optical path gas pool can increase the effective optical path and keep the sample gas at the working pressure. Each reflective surface works independently without interfering with each other, and the detection accuracy is high. By controlling the system temperature and making the sample gas extremely evenly distributed in the gas pool, the detection limit of the target substance can be improved. The narrow linewidth infrared laser has a narrow spectral line width and concentrated spectral energy. It is used with a single-wavelength infrared photometer to detect the transmittance of the infrared spectrum in the gas pool, which can effectively detect extremely low concentration components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall system block diagram of the present invention.

[0020] Figure 2 It is a block diagram of the air collection and pressurization system of the present invention.

[0021] Figure 3 It is a structural schematic diagram of the air sampling head of the present invention.

[0022] Figure 4 It is a block diagram of the Helios long optical path gas pool detection system of the present invention.

[0023] Figure 5 It is a diagram of the gas pool rotation system of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 5 , the present invention provides a technical solution:

[0026] A detection system for sulfur hexafluoride gas in the station space of an outdoor substation, wherein a sulfur hexafluoride electrical device 2 is installed in the outdoor substation 1, a cruising track 3 is arranged around the sulfur hexafluoride electrical device 2, a cruising sampling vehicle 4 is installed on the cruising track 3, a detection equipment room 5 is arranged at the end of the cruising track 3, a Helios long optical path gas pool detection system 6 is installed in the detection equipment room 5, and an air collection and pressurization system 7 for collecting sulfur hexafluoride gas is installed on the cruising sampling vehicle 4.

[0027] A patrol path for the detection device is set up in the station, so that the air collection device can patrol and collect samples in the equipment area of ​​the station. In addition, after completing the sample collection, the device can carry the collector to the detection equipment room and use the docking equipment matched with the detection equipment to transfer the sample, so that the sample can be collected by the detection equipment without pollution.

[0028] The air collection and pressurization system 7 includes an air sampling head 700, which is connected to a coarse filter 701 to preliminarily filter the collected air, the coarse filter 701 is connected to a fine filter 702, the fine filter 702 is connected to a first oil-free air compressor 703, the oil-free air compressor 703 is connected to a dehumidifier 704, the dehumidifier 704 is connected to a first valve 705, the output end of the first valve 705 is respectively connected to a second valve 706 and a throttling dryer 707, the throttling dryer 707 is connected to the third valve 708, the third valve 708 is connected to the second oil-free air compressor 710, the air inlet and air outlet of the second oil-free air compressor 710 are connected to the two ends of the fourth valve 709, the second oil-free air compressor 710 is connected to the fifth valve 711, the fifth valve 711 is connected to the deaerator 712, the deaerator 712 is connected to the air storage tank 713, the air storage tank 713 is connected to the sixth valve 715, and the top of the air storage tank 713 is also connected to a cooler 714.

[0029] The oil-free booster pump uses gas power to increase the air density in the gas pool, enriching the trace sulfur hexafluoride gas in the air, thereby enhancing the sensitivity of detection.

[0030] The air filter filters the air multiple times, intercepts the particles in the air, and improves the cleanliness of the air entering the gas pool to maintain the cleanliness of the reflective components and improve the signal-to-noise ratio.

[0031] The air drying system dehumidifies the sampled gas to reduce its moisture content to a sufficiently low level.

[0032] Deaerator: removes oxygen from the air and reduces detection noise.

[0033] The air cooler cools the pressurized gas and controls the gas temperature in the gas pool.

[0034] The air sampling head 700 includes a threaded joint 716 that is convenient for connection with a pipeline. A collection channel 717 is provided on the air sampling head 700. An air inlet 718 is provided at the top of the collection channel 717. The collection channel 717 and the air inlet 718 form a spherical shape at the end of the air sampling head 700 to facilitate the collection of air in multiple directions. The multi-directional air collecting head collects gas in the nearby three-dimensional space without dead angles, which can avoid subjective sampling errors caused by a single directionality to a certain extent. At the same time, without increasing the volume of the air collection head, the effect of increasing the air collection range can be achieved by adjusting the pore diameter.

[0035] The Helios long optical path gas pool detection system 6 includes valve A and valve B. Valve B is connected to an air filter. The output end of the air filter is respectively connected to valve C and valve D. The output end of valve C is respectively connected to a Helios long optical path gas pool and valve E. Valve D and valve E are connected to a high-purity nitrogen bottle. Valve F is connected to the Helios long optical path gas pool.

[0036] The Heliotech long optical path gas cell includes a narrow line width infrared laser, a single beam infrared photometer, a gas cell pressure controller, a gas cell temperature control system, and a gas cell rotation system.

[0037] The Heliot gas absorption cell allows narrow linewidth infrared laser signals to avoid interference noise, with less signal interference and a smaller volume than the White absorption cell. At the same time, the absorption cell is a pressure-bearing and temperature-controlled component. The air is sucked and inflated into the absorption cell by an air pump, and the gas state of the sample gas in the absorption cell is controlled by a pressure regulating mechanism and a temperature control device. Among them:

[0038] Helios long optical path gas cell can increase the effective optical path and keep the sample gas at the working pressure. Each reflective surface works independently without interfering with each other, and the detection accuracy is high. By controlling the system temperature and making the sample gas extremely evenly distributed in the gas cell, the detection limit of the target substance can be improved.

[0039] Narrow linewidth infrared lasers have narrow spectral line width and concentrated spectral energy. When used with a single-wavelength infrared photometer to detect the transmittance of the infrared spectrum in the gas cell, they can effectively detect extremely low concentration components.

[0040] The gas pool pressure controller detects the gas pressure of the gas pool through a pressure probe, and can control the operation of the oil-free booster pump and the gas pool's air inlet and outlet solenoid valves to adjust the pressure of the measured gas.

[0041] The gas pool temperature control system is located in the center of the gas pool, and the part in the gas pool has heat exchange fins to increase the heat exchange efficiency.

[0042] The gas pool rotation system rotates the gas pool, utilizing the viscosity of the gas to drive the movement of the gas in the pool, thereby achieving the effect of fully mixing the gas in the pool.

[0043] A method for detecting sulfur hexafluoride gas in the space of an outdoor substation, using the above-mentioned detection system for sulfur hexafluoride gas in the space of an outdoor substation, the method comprises the following specific steps:

[0044] Control the cruising sampling vehicle 4 to drive the air collection and pressurization system 7 to collect air around the sulfur hexafluoride electrical equipment 2 in the outdoor substation 1;

[0045] When collecting air, open the first valve 705, the third valve 708 and the fifth valve 711;

[0046] After the air collection is completed, the cruise sampling vehicle 4 returns to the detection equipment room 5, closes the first valve 705, the third valve 708 and the fifth valve 711, opens the sixth valve 715 to flush the pipeline, and then closes the sixth valve 715, opens valve E and valve F to fill the gas pool with nitrogen for cleaning, closes valve E, controls valve F, and the detection system adjusts the gas pool pressure, preheats and calibrates, and opens valve B and valve D to flush the pipeline;

[0047] Connect the outlet of the air collection and pressurization system 7 to the inlet of the Heliotech long optical path gas pool detection system 6, open the sixth valve 715, and inject the collected gas into the Heliotech long optical path gas pool detection system 6;

[0048] Open valve A to exhaust and flush the pipeline, open valve B, valve C, and valve F to flush the pipeline, open valve B and valve C to inject samples into the gas pool, close valve C, control valve F to adjust pressure, control temperature, and prepare for testing, open valve B and valve D to fill the sampling system with nitrogen, and the system detects sulfur hexafluoride gas;

[0049] After the test is completed, open valves E and F to fill the gas pool with nitrogen for cleaning.

[0050] There are various monitoring methods related to sulfur hexafluoride gas. The qualitative and quantitative monitoring methods for sulfur hexafluoride in the air have the disadvantages of low sensitivity, high false alarm rate, large equipment, and large data upload limitations. The infrared detection method has the advantage of non-contact and greater freedom of use. It uses the selective absorption of the infrared wavelength beam by the gas substance to compare the intensity change of the infrared beam before and after it penetrates the gas to obtain the gas concentration. The use of narrow-bandwidth monochromatic lasers for trace gas detection has the advantages of high precision, strong anti-interference ability, and good coordination with long optical path gas cells, and has a good effect on the detection of rarefied gas components.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for detecting sulfur hexafluoride gas in the space of an outdoor substation, wherein a sulfur hexafluoride electrical device (2) is installed in the outdoor substation (1), characterized in that: A cruising track (3) is arranged around the sulfur hexafluoride electrical equipment (2), a cruising sampling vehicle (4) is installed on the cruising track (3), a detection equipment room (5) is arranged at the end of the cruising track (3), a Helios long optical path gas pool detection system (6) is installed in the detection equipment room (5), and an air collection and pressurization system (7) for collecting sulfur hexafluoride gas is installed on the cruising sampling vehicle (4); The air collection and pressurization system (7) comprises an air sampling head (700), the air sampling head (700) is connected to a coarse filter (701) to perform preliminary filtration on the collected air, the coarse filter (701) is connected to a fine filter (702), the fine filter (702) is connected to a first oil-free air compressor (703), the oil-free air compressor (703) is connected to a dehydrator (704), the dehydrator (704) is connected to a first valve (705), the output end of the first valve (705) is respectively connected to a second valve (706) and a throttling dryer (707), the throttling dryer ( 707) is connected to a third valve (708), the third valve (708) is connected to a second oil-free air compressor (710), the air inlet and air outlet of the second oil-free air compressor (710) are connected to two ends of a fourth valve (709), the second oil-free air compressor (710) is connected to a fifth valve (711), the fifth valve (711) is connected to a deaerator (712), the deaerator (712) is connected to an air storage tank (713), the air storage tank (713) is connected to a sixth valve (715), and the top of the air storage tank (713) is also connected to a cooler (714); The Helios long optical path gas pool detection system (6) comprises valve A and valve B, wherein valve B is connected to an air filter, the output end of the air filter is respectively connected to valve C and valve D, the output end of valve C is respectively connected to a Helios long optical path gas pool and valve E, the valve D and valve E are connected to a high-purity nitrogen bottle, and the Helios long optical path gas pool is connected to valve F; The Heliotech long optical path gas cell includes a narrow line width infrared laser, a single beam infrared photometer, a gas cell pressure controller, a gas cell temperature control system, and a gas cell rotation system.

2. A detection system for sulfur hexafluoride gas in the outdoor substation space according to claim 1, characterized in that: The air sampling head (700) comprises a threaded joint (716) for convenient connection with a pipeline. A collection channel (717) is provided on the air sampling head (700). An air inlet (718) is provided at the top of the collection channel (717). The collection channel (717) and the air inlet (718) form a spherical shape at the end of the air sampling head (700) to facilitate the collection of air from multiple directions.

3. A method for detecting sulfur hexafluoride gas in the space of an outdoor substation, using the detection system for sulfur hexafluoride gas in the space of an outdoor substation according to claim 1, characterized in that: The method comprises the following specific steps: Controlling the cruising sampling vehicle (4) to drive the air collection and pressurization system (7) to collect air around the sulfur hexafluoride electrical equipment (2) in the outdoor substation (1); When collecting air, open the first valve (705), the third valve (708) and the fifth valve (711); After the air collection is completed, the cruise sampling vehicle (4) returns to the detection equipment room (5), closes the first valve (705), the third valve (708) and the fifth valve (711), opens the sixth valve (715) to flush the pipeline, and then closes the sixth valve (715), opens valve E and valve F to fill the gas pool with nitrogen for cleaning, closes valve E, controls valve F, adjusts the gas pool pressure, preheats and calibrates the detection system, and opens valve B and valve D to flush the pipeline; Connect the outlet of the air collection and pressurization system (7) to the inlet of the Heliotech long optical path gas pool detection system (6), open the sixth valve (715), and inject the collected gas into the Heliotech long optical path gas pool detection system (6); Open valve A to exhaust and flush the pipeline, open valve B, valve C, and valve F to flush the pipeline, open valve B and valve C to inject samples into the gas pool, close valve C, control valve F to adjust pressure, control temperature, and prepare for testing, open valve B and valve D to fill the sampling system with nitrogen, and the system detects sulfur hexafluoride gas; After the test is completed, open valves E and F to fill the gas pool with nitrogen for cleaning.

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