CN107561209A - Sulfur hexafluoride gas acidity detection method and device - Google Patents
Sulfur hexafluoride gas acidity detection method and device Download PDFInfo
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Abstract
The present invention provides a kind of sulfur hexafluoride gas acidity detection method and device, and wherein method is：The NaOH solution for first passing through finite concentration and volume all absorbs sulfur hexafluoride gas middle acid substance, obtains the sulfur hexafluoride gas acidic materials absorbing liquid containing 2 kinds of buffer systems and a kind of weak acid system, according to absorbing liquid system performance, establishes absorbing liquid Titration model；Then H is used2SO4Solution titrates to absorbing liquid, while records absorbing liquid initial pH value and the pH value corresponding H consumed at 7.0,6.0 and 2.5 respectively2SO4Liquor capacity, absorbing liquid Titration model then is solved using this four groups of data, obtains sulfur hexafluoride gas acidic materials total amount.Device is：Liquid level sensor and pH electrodes are provided with titration cell, top connects with the bottom of absorption cell；Admission line is provided with gas circulator, and end probes into absorption cell and gas tip is inscribed；The atomizer on top passes through the input duct provided with liquid circulation pump and is respectively communicated with titration cell and six-way valve in absorption cell, and the import of six-way valve connects syringe pump.
Description
Technical field
The present invention provides a kind of sulfur hexafluoride gas acidity detection method and device, belongs to power system detection technique field
Technical background
《Industrial sulfur hexafluoride》(GB/T 12022-2014) proposes requirement to acidity content in sulfur hexafluoride gas, bright
Really specific acidity detection method；《Sulfur hexafluoride gas acidity assaying method》(DL/T 916-2005) also specify that in detail
The measuring method and absorption plant of acidity content in sulfur hexafluoride gas；Three gas washings are set up in testing program as defined in standard
Bottle, when result judges, if the SF that second Drexel bottle absorbs6Acidity in gas is more than the SF that first Drexel bottle absorbs6
During acidity in gas, it is believed that absorb not exclusively, it is necessary to test again.Because the 3rd Drexel bottle is sky by theory setting
White group experiment, i.e. SF6Acidic materials will be completely absorbed before the 3rd Drexel bottle is reached, otherwise can not be according to standard
The calculation formula provided is calculated.In addition, the Chinese patent of Patent No. " CN2015101919249 " discloses sulfur hexafluoride gas
Body acidity detection means and method, the Chinese patent of Patent No. " CN2015101894082 " disclose sulfur hexafluoride gas acid
Degree and hydrolyzable content of fluoride integrated detection method, the Chinese patent of Patent No. " CN2015202422065 " disclose
Sulfur hexafluoride gas middle acid substance and hydrolyzable Absorption of Fluoride device.
For detection method, SF is thought in the detection method introduced in above-mentioned 2 standards and 2 patents of invention6Gas
Body middle acid substance source is HF acid, absorbs HF acid using NaOH solution, then uses H2SO4Titration residue NaOH amounts, are calculated
SF6Gas acidic substance content.But SF6Gas middle acid substance does not only have HF acid, it is also possible to H be present2S and SO2Gas,
Therefore, NaOH solution is to SF6Gas is completed to contain NaF, NaHS, Na in the absorbing liquid after absorbing2S、Na2SO3、NaHSO3Deng thing
Matter, wherein NaF are weak acid system, NaHS and Na2S、Na2SO3And NaHSO3It is buffer system, therefore, uses H2SO4Titration absorbs
SF6During NaOH absorbing liquids after gas, not only remaining NaOH solution can consume H2SO4Solution, and two kinds of buffer solution systems
In the presence of can also consume a large amount of H2SO4Titrating solution, ultimately result in measurement result inaccuracy.Ion-chromatographic determination contain NaF,
NaHS、Na2S、Na2SO3、NaHSO3NaOH absorbing liquids Deng material have the advantages of high measurement accuracy, favorable reproducibility, but should
, it is necessary to prepare the gradient concentration standard liquid of each component when method is tested, ion chromatograph volume itself is larger, therefore, ion
Chromatography is not used as Site Detection use.
With regard to SF6It is for gas middle acid substance absorption plant, the defects of prior art：1st, absorbed without detection in real time
Cheng Gongneng, it is difficult to ensure fully absorbing and accurately detecting measured sulfur hexafluoride gas for sulfur hexafluoride gas middle acid substance
The volume of body；2) rely solely on sulfur hexafluoride gas from gas absorption cell bottom to enter, absorbed by NaOH solution, absorb effect
Rate is needed further improvement and improved.
The content of the invention
It is an object of the invention to provide one kind can overcome drawbacks described above, have it is simple to operate, it is real-time detection absorption process and
The high feature of accuracy of detection, and can guarantee that the sulfur hexafluoride gas that separate sources sulfur hexafluoride gas middle acid substance is completely absorbed
Acidity detection method and device.Its technical scheme is：
A kind of sulfur hexafluoride gas acidity detection method, it is characterised in that comprise the following steps：
1) H that the NaOH solution and concentration that compound concentration is 0.01mol/L are 0.005mol/L2SO4Solution, wherein NaOH
Water used in solution is the deionized water after removal air；
2) the NaOH solution pH that step 1) is prepared is adjusted to 8, continues to use H2SO4Solution titrates NaOH solution to pH regulations
For 7, the concentration of NaOH solution in now mixed liquor is solved.
3) NaOH solution that concentration is 0.01mol/L is passed through into the liquid circulation lines provided with liquid circulation pump and injects absorption cell
Interior 200mL, is designated as VS, NaOH solution top out of absorption cell sprays downwards, by 10L sulfur hexafluoride gas through being provided with gas circulation
The gas recycling duct of pump sprays upwards from absorption cell inner bottom part, ensures that sulfur hexafluoride gas middle acid substance can be molten with NaOH
Liquid fully contacts absorption, and repeatedly the acidic materials after circulation in sulfur hexafluoride gas are fully absorbed by NaOH solution, are absorbed
Liquid；
4) absorbing liquid in absorption cell is discharged into titration cell, records pH value now with pH electrodes, then be with concentration
0.005mol/L H2SO4Solution continues to titrate absorbing liquid, records that pH value is corresponding at 7.0,6.0,2.5 to consume with pH electrodes
H2SO4Liquor capacity, use VxRepresent；
5) equation is utilized
It can obtain NaHS and Na2S total concentration, Na2SO3With NaHSO3Total concentration and HF concentration, in formula：
Ve：It is titrated to the H consumed during basicity terminal2SO4Solution；
Vx：It is titrated to the H consumed when pH value is x values2SO4Liquor capacity, i.e. step 4) are recorded pH value with pH electrodes and existed
7.0th, 6.0,2.5 when corresponding consumption H2SO4Liquor capacity；
Ca：H2SO4Hydrogen ion concentration is 0.01mol/L in solution；
VS：The volume of NaOH solution is 200mL；
S1：NaHS and Na2S total concentrations；
K’a1：NaHS and Na2S dissociation constants are 1.3 × 10-7；
S2：Na2SO3And NaHSO3Total concentration；
K’a2：Na2SO3And NaHSO3Dissociation constant is 5.6 × 10-8；
F1：HF concentration；
K’a3：HF dissociation constants are 6.8 × 10-4；
Wherein there was only Ve、S1、S2、F1Four unknown numbers, can be solved with four prescription journeys, and sulfur hexafluoride gas acidity is exactly
S1、S2、F1Sum.
It is a kind of to realize the device of above-mentioned sulfur hexafluoride gas acidity detection method, including place vertically absorption cell, air inlet
The upper end connection of pipeline, discharge duct, input duct and removal waste fluid pipeline, wherein absorption cell is provided with the blast pipe of 2 magnetic valves
Road, lower end connect the admission line for being sequentially provided with pressure-reducing valve, pressure maintaining valve, flow sensor and 2 magnetic valves, it is characterised in that：
Absorption cell is pyramidal structure, volume 1000mL；Six-way valve, titration cell and surge tank are set up, level sensing is provided with titration cell
Device and pH electrodes, top connect with the bottom of absorption cell；The charge flow rate of admission line is controlled in 1L/min, volume 5L, gas
Body pressure is 0.2MPa, and outside of the admission line at absorption cell is provided with gas circulator, and admission line is probeed into absorption cell
The end of lower end is provided with gas tip, and gas tip upward sprays sulfur hexafluoride gas in the circular cone gas to form that cone angle is 90 degree
Curtain；Top in absorption cell is provided with atomizer, and for NaOH solution to be atomized, its equivalent grain size is 66 μm, and is sprayed downwards
The circular cone liquid curtain that cone angle is 95 degree is formed, pressure 0.03MPa, flow 0.16L/min, the liquid feeding end of atomizer is through being provided with liquid
The input duct of circulating pump and magnetic valve is respectively communicated with the bottom of titration cell and the NaOH solution outlet of six-way valve, six-way valve
Import connects injection pump discharge, and NaOH solution import and leakage fluid dram are also set respectively on six-way valve；The inlet, outlet end of surge tank respectively with
Discharge duct is connected with admission line, and junction is respectively positioned between 2 magnetic valves on discharge duct and admission line.
The present invention compared with prior art, the advantage is that：
1) multiple spot titration method is used, effectively overcomes buffer system in solution (NaHS and Na2S、Na2SO3And NaHSO3)
With weak acid system to Accurate Determining SF6The interference of acidic components in gas, testing result precision are high.
2) absorption cell, NaOH solution loop module, gas circulation module and gas tip with atomizer are provided with,
Absorption cell uses conical design, and absorption process uses absorbing liquid to be sprayed with top atomizing type at the top of absorption cell, and is absorbing
Bottom of pond portion collects, and is sprayed again from top；Sulfur hexafluoride gas is sprayed from absorption cell bottom by gas tip, and such a mode can
Ensure that sulfur hexafluoride gas middle acid substance is quickly absorbed；Sulfur hexafluoride gas after absorption enters gas from base bleed mouth
Pump, sprayed again from absorption cell bottom, into surge tank.So repeatedly, it is ensured that sulfur hexafluoride gas middle acid substance can
Absorption is fully contacted with NaOH solution, improves absorption efficiency.
3) pH electrodes are installed in collecting pond, acidity in absorbing liquid are monitored in real time, when tending towards stability, it is believed that absorbed
Entirely.Now stop absorbing, avoid and the occurrence of complete is not absorbed in national standard method, and ensure the lithium of separate sources
Acidic materials in sulphur gas are completely absorbed, and have broad applicability.
4) device can accurately control gas flow and volume, improve measurement accuracy.
5) device volume is compact, simple to operate, is advantageously implemented the instrumentation of mensuration mode, and examination is carried out at the scene of being more convenient for
Test work.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
In figure：1st, absorption cell 2, admission line 3, discharge duct 4, input duct 5, removal waste fluid pipeline 6, magnetic valve
7th, pressure-reducing valve 8, pressure maintaining valve 9, flow sensor 10, six-way valve 11, titration cell 12, surge tank 13, liquid level sensor
14th, pH electrodes 15, gas circulator 16, gas tip 17, atomizer 18, syringe pump, 19, liquid circulation pump
Embodiment
Technical solution of the present invention is described further with reference to embodiment.In the embodiment shown in fig. 1：Absorption cell
1 is pyramidal structure, and volume 1000mL, discharge duct 3 of the upper end connection provided with 2 magnetic valves 6 of absorption cell 1, lower end connects
It is sequentially provided with the admission line 2 of pressure-reducing valve 7, pressure maintaining valve 8, flow sensor 9 and 2 magnetic valves 6.Liquid level is provided with titration cell 11
Sensor 13 and pH electrodes 14, top connect with the bottom of absorption cell 1.The charge flow rate of admission line 2 is controlled in 1L/min, body
Product is 5L, and gas pressure 0.2MPa, outside of the admission line 2 at absorption cell 1 is provided with gas circulator 15, admission line
2 ends for probeing into lower end in absorption cell 1 are provided with gas tip 16, and gas tip 16 sprays sulfur hexafluoride gas to form cone upward
Angle is 90 degree of circular cone air curtain, and gas circulation flow control is in 8L/min.Top in absorption cell 1 is provided with atomizer 17, uses
It is atomized in by NaOH solution, its equivalent grain size is 66 μm, and injection downwards forms the circular cone liquid curtain that cone angle is 95 degree, pressure
0.03MPa, flow 0.16L/min, the liquid feeding end of atomizer 17 pass through the input duct provided with liquid circulation pump 19 and magnetic valve 6
4 are respectively communicated with the NaOH solution outlet of the bottom of titration cell 11 and six-way valve 10.The import of six-way valve 10 connects that to fill NaOH molten
The syringe pump 18 of liquid exports, and also sets NaOH solution import and leakage fluid dram on six-way valve 10 respectively；The inlet, outlet end of surge tank 12 point
Do not connected with discharge duct 3 and admission line 2, junction be respectively positioned on 2 magnetic valves 6 on discharge duct 3 and admission line 2 it
Between.
To verify the repeatability of sulfur hexafluoride gas acidity detection method of the present invention, embodiment 1 and embodiment 2 are all profits
The absorption detecting for carrying out same sulfur hexafluoride gas with Fig. 1 shown devices, it is easy to contrast.Embodiment 1 concretely comprises the following steps：
1) compound concentration is 0.005mol/L H2SO4Solution and the NaOH solution that concentration is 0.01mol/L, wherein NaOH
Water used in solution is the deionized water after removal air；
2) 200mL NaOH solutions are taken and use H2SO4PH is adjusted to 8 by solution, continues to use H2SO4Solution titrates NaOH solution
It is 7 to pH, it is 10 to solve NaOH concentration in now mixed liquor-6mol/L。
3) NaOH solution that concentration in syringe pump 18 is 0.01mol/L is passed through into the liquid circulating pipe provided with liquid circulation pump 19
200mL in road injection absorption cell 1, is designated as VS, NaOH solution top out of absorption cell 1 sprays downwards, by 10L sulfur hexafluoride gas
Sprayed upwards from the inner bottom part of absorption cell 1 through the gas recycling duct provided with gas circulator 15, ensure acid in sulfur hexafluoride gas
Property material absorption can be fully contacted with NaOH solution, repeatedly the acidic materials after circulation in sulfur hexafluoride gas are by NaOH solution
Fully absorb, obtain absorbing liquid；
4) absorbing liquid in absorption cell 1 is discharged into titration cell 11, the pH value recorded now with pH electrodes is 7.8, then is used
Concentration is 0.005mol/L H2SO4Solution titrates absorbing liquid, and recording pH value at 7.0,6.0,2.5 with pH electrodes correspondingly disappears
The H of consumption2SO4Liquor capacity, respectively 41.7mL, 76.6mL, 334.3mL；
5) above-mentioned data are brought into following equation, solves equationIt can obtain NaHS and Na2S's is total
Concentration, Na2SO3With NaHSO3Total concentration and HF concentration, in formula：
Ve：It is titrated to the H consumed during basicity terminal2SO4Solution；
Vx：It is titrated to the H consumed when pH value is x values2SO4Liquor capacity, i.e. step 4) are recorded pH value with pH electrodes and existed
7.0th, 6.0,2.5 when corresponding consumption H2SO4Liquor capacity；
Ca：H2SO4Hydrogen ion concentration is 0.01mol/L in solution；
VS：The volume of NaOH solution is 200mL；
S1：NaHS and Na2S total concentrations；
K’a1：NaHS and Na2S dissociation constants are 1.3 × 10-7；
S2：Na2SO3And NaHSO3Total concentration；
K’a2：Na2SO3And NaHSO3Dissociation constant is 5.6 × 10-8；
F1：HF concentration；
K’a3：HF dissociation constants are 6.8 × 10-4；
Wherein there was only Ve、S1、S2、F1Four unknown numbers, it can be solved with four prescription journeys, respectively 345.4mL,
0.0004671mol/L, 0.0002301mol/L, 0.000341mol/L, sulfur hexafluoride gas acidity are exactly S1、S2、F1Sum,
Specially 0.0010382.
Embodiment 2 concretely comprises the following steps：
1) compound concentration is 0.005mol/L H2SO4Solution and the NaOH solution that concentration is 0.01mol/L, wherein NaOH
Water used in solution is the deionized water after removal air；
2) 200mL NaOH solutions are taken and use H2SO4PH is adjusted to 8 by solution, continues to use H2SO4Solution titrates NaOH solution
It is 7 to pH, it is 10 to solve NaOH concentration in now mixed liquor-6mol/L。
3) NaOH solution that concentration in syringe pump 18 is 0.01mol/L is passed through into the liquid circulating pipe provided with liquid circulation pump 19
200mL in road injection absorption cell 1, is designated as VS, NaOH solution top out of absorption cell 1 sprays downwards, by with the quality of embodiment 1
10L sulfur hexafluoride gas passes through the gas recycling duct provided with gas circulator 15 and sprayed upwards from the inner bottom part of absorption cell 1, ensures six
Sulfur fluoride gas middle acid substance can fully contact absorption with NaOH solution, repeatedly the acidity after circulation in sulfur hexafluoride gas
Material is fully absorbed by NaOH solution, obtains absorbing liquid；
4) absorbing liquid in absorption cell 1 is discharged into titration cell 11, it is 7.7 to record pH value with pH electrodes, then is with concentration
0.005mol/L H2SO4Solution titrates absorbing liquid, and pH value corresponding consumption at 7.0,6.0,2.5 is recorded with pH electrodes
H2SO4Liquor capacity, respectively 42.1mL, 77.4mL, 335.1mL；
5) above-mentioned data are brought into following equation, solves equationCan obtain NaHS with
Na2S total concentration, Na2SO3With NaHSO3Total concentration and HF concentration, in formula：
Ve：It is titrated to the H consumed during basicity terminal2SO4Solution；
Vx：It is titrated to the H consumed when pH value is x values2SO4Liquor capacity, i.e. step 2) are recorded pH value with pH electrodes and existed
7.0th, 6.0,2.5 when corresponding consumption H2SO4Liquor capacity；
Ca：H2SO4Hydrogen ion concentration is 0.01mol/L in solution；
VS：The volume of NaOH solution is 200mL；
S1：NaHS and Na2S total concentrations；
K’a1：NaHS and Na2S dissociation constants are 1.3 × 10-7；
S2：Na2SO3And NaHSO3Total concentration；
K’a2：Na2SO3And NaHSO3Dissociation constant is 5.6 × 10-8；
F1：HF concentration；
K’a3：HF dissociation constants are 6.8 × 10-4；
Wherein there was only Ve、S1、S2、F1Four unknown numbers, solved with four prescription journeys, respectively 346.1mL,
0.0004708mol/L, 0.0002331mol/L, 0.000345mol/L, sulfur hexafluoride gas acidity are exactly S1、S2、F1Sum,
Specially 0.0010489.
The accuracy and repeatability detected for the checking present apparatus and method to sulfur hexafluoride gas acidity, use《It is lithium
Sulphur gas acidometry》Method of testing, chromatography of ions are respectively to the acid of above-mentioned sulfur hexafluoride gas in (DL/T 916-2005)
Degree is determined, and the method for the invention, DL/T 916-2005 sides is respectively adopted to the acidity of the sulfur hexafluoride gas
Method and chromatography of ions have carried out second and determined, and detailed comparisons' data see the table below.
| Title | NaHS and Na2S total concentrations | Na2SO3And NaHSO3Total concentration | HF concentration | SF6Gas acidity |
| Embodiment 1 | 0.0004671 | 0.0002301 | 0.000341 | 0.0010382 |
| DL/T 916-2005 methods | / | / | / | 0.00074148 |
| Chromatography of ions | 0.0004569 | 0.0002298 | 0.00034 | 0.0010267 |
| Embodiment 2 | 0.0004708 | 0.0002331 | 0.000345 | 0.0010489 |
| DL/T 916-2005 methods | / | / | / | 0.0008517 |
| Chromatography of ions | 0.0005 | 0.0002401 | 0.0003579 | 0.001098 |
Test result shows：To same sulfur hexafluoride gas, testing result is approximate twice by the present invention, closest ability
The generally acknowledged chromatography of ions test result in domain, illustrate that testing result precision of the present invention is high, repetitive rate is good, and simple to operate, is much better than
《Sulfur hexafluoride gas acidometry》(DL/T 916-2005) method of testing.
Claims (2)
1. a kind of sulfur hexafluoride gas acidity detection method, it is characterised in that comprise the following steps：
1) H that the NaOH solution and concentration that compound concentration is 0.01mol/L are 0.005mol/L2SO4Solution, wherein NaOH solution
Water used is the deionized water after removal air；
2) the NaOH solution pH that step 1) is prepared is adjusted to 8, continues to use H2SO4Solution titrates NaOH solution and is adjusted to 7 to pH,
Solve the concentration of NaOH solution in now mixed liquor；
3) NaOH solution that concentration is 0.01mol/L is passed through into the liquid circulation lines provided with liquid circulation pump to inject in absorption cell
200mL, it is designated as VS, NaOH solution top out of absorption cell sprays downwards, by 10L sulfur hexafluoride gas through being provided with gas circulator
Gas recycling duct sprayed upwards from absorption cell inner bottom part, ensure sulfur hexafluoride gas middle acid substance can be with NaOH solution
Fully contact absorbs, and repeatedly the acidic materials after circulation in sulfur hexafluoride gas are fully absorbed by NaOH solution, obtain absorbing liquid；
4) absorbing liquid in absorption cell is discharged into titration cell, records pH value now with pH electrodes, then be with concentration
0.005mol/L H2SO4Solution continues to titrate absorbing liquid, records that pH value is corresponding at 7.0,6.0,2.5 to consume with pH electrodes
H2SO4Liquor capacity, use VxRepresent；
5) equation is utilizedI.e.
It can obtain NaHS and Na2S total concentration, Na2SO3With NaHSO3Total concentration and HF concentration, in formula：
Ve：It is titrated to the H consumed during basicity terminal2SO4Solution；
Vx：It is titrated to the H consumed when pH value is x values2SO4Liquor capacity, i.e. step 4) with pH electrodes record pH value 7.0,
6.0th, 2.5 when corresponding consumption H2SO4Liquor capacity；
Ca：H2SO4Hydrogen ion concentration is 0.01mol/L in solution；
VS：The volume of NaOH solution is 200mL；
S1：NaHS and Na2S total concentrations；
K’a1：NaHS and Na2S dissociation constants are 1.3 × 10-7；
S2：Na2SO3And NaHSO3Total concentration；
K’a2：Na2SO3And NaHSO3Dissociation constant is 5.6 × 10-8；
F1：HF concentration；
K’a3：HF dissociation constants are 6.8 × 10-4；
Wherein there was only Ve、S1、S2、F1Four unknown numbers, it can be solved with four prescription journeys, sulfur hexafluoride gas acidity is exactly S1、S2、
F1Sum.
Realize the device of above-mentioned sulfur hexafluoride gas acidity detection method 2. a kind of, including place vertically absorption cell (1), air inlet
The upper end connection of pipeline (2), discharge duct (3), input duct (4) and removal waste fluid pipeline (5), wherein absorption cell (1) is provided with 2
The discharge duct (3) of magnetic valve (6), lower end connection are sequentially provided with pressure-reducing valve (7), pressure maintaining valve (8), flow sensor (9) and 2
The admission line (2) of magnetic valve (6), it is characterised in that：Absorption cell (1) is pyramidal structure, volume 1000mL；Set up six-way valve
(10), titration cell (11) and surge tank (12), are provided with liquid level sensor (13) and pH electrodes (14) in titration cell (11), top and
The bottom connection of absorption cell (1)；The charge flow rate of admission line (2) is controlled in 1L/min, volume 5L, gas pressure
0.2MPa, admission line (2) are provided with gas circulator (15) close to the outside at absorption cell (1) place, and admission line (2) probes into absorption
The end of pond (1) interior lower end is provided with gas tip (16), and gas tip (16) sprays sulfur hexafluoride gas to form cone angle upward
For 90 degree of circular cone air curtain；Top in absorption cell (1) is provided with atomizer (17), and for NaOH solution to be atomized, its is equivalent
Particle diameter is 66 μm, and injection downwards forms the circular cone liquid curtain that cone angle is 95 degree, pressure 0.03MPa, flow 0.16L/min, atomization
The liquid feeding end of shower nozzle (17) passes through the input duct (4) provided with liquid circulation pump (19) and magnetic valve (6) and is respectively communicated with titration cell
(11) bottom and the NaOH solution outlet of six-way valve (10), the import of six-way valve (10) connect syringe pump (18) outlet, and six is logical
Valve also sets NaOH solution import and leakage fluid dram respectively on (10)；The inlet, outlet end of surge tank (12) respectively with discharge duct (3) and
Admission line (2) is connected, and junction is respectively positioned between 2 magnetic valves (6) on discharge duct (3) and admission line (2).
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| CN110865167A (en) * | 2019-12-24 | 2020-03-06 | 自然资源部第二海洋研究所 | Efficient water-gas mixing device and method for calibration of dissolved gas sensor |
| CN112014388A (en) * | 2020-09-02 | 2020-12-01 | 广东电网有限责任公司电力科学研究院 | Full-automatic sulfur hexafluoride acidity detection device and method |
| CN113759074A (en) * | 2021-09-29 | 2021-12-07 | 国网黑龙江省电力有限公司电力科学研究院 | Sulfur hexafluoride gas acidity detection device |
| CN113759074B (en) * | 2021-09-29 | 2024-06-07 | 国网黑龙江省电力有限公司电力科学研究院 | Sulfur hexafluoride gas acidity detection device |
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| CN110865167B (en) * | 2019-12-24 | 2024-04-26 | 自然资源部第二海洋研究所 | Efficient water-gas mixing device and method for calibrating soluble gas sensor |
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| CN113759074A (en) * | 2021-09-29 | 2021-12-07 | 国网黑龙江省电力有限公司电力科学研究院 | Sulfur hexafluoride gas acidity detection device |
| CN113759074B (en) * | 2021-09-29 | 2024-06-07 | 国网黑龙江省电力有限公司电力科学研究院 | Sulfur hexafluoride gas acidity detection device |
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