CN116741432A - Insulating mixed gas and application thereof - Google Patents
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- CN116741432A CN116741432A CN202211584354.6A CN202211584354A CN116741432A CN 116741432 A CN116741432 A CN 116741432A CN 202211584354 A CN202211584354 A CN 202211584354A CN 116741432 A CN116741432 A CN 116741432A
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- FFTOUVYEKNGDCM-OWOJBTEDSA-N (e)-1,3,3-trifluoroprop-1-ene Chemical compound F\C=C\C(F)F FFTOUVYEKNGDCM-OWOJBTEDSA-N 0.000 claims abstract description 30
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000001294 propane Substances 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 213
- 239000000203 mixture Substances 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000003570 air Substances 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 229910018503 SF6 Inorganic materials 0.000 abstract description 25
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 abstract description 25
- 229960000909 sulfur hexafluoride Drugs 0.000 abstract description 25
- 238000009413 insulation Methods 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 231100000053 low toxicity Toxicity 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 239000007791 liquid phase Substances 0.000 description 22
- 238000012216 screening Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 14
- 238000002309 gasification Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 238000002156 mixing Methods 0.000 description 12
- 239000012071 phase Substances 0.000 description 10
- 239000004341 Octafluorocyclobutane Substances 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 description 6
- 235000019407 octafluorocyclobutane Nutrition 0.000 description 6
- FDMFUZHCIRHGRG-UHFFFAOYSA-N 3,3,3-trifluoroprop-1-ene Chemical compound FC(F)(F)C=C FDMFUZHCIRHGRG-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- AASDJASZOZGYMM-UHFFFAOYSA-N 2,3,3,3-tetrafluoro-2-(trifluoromethyl)propanenitrile Chemical compound FC(F)(F)C(F)(C#N)C(F)(F)F AASDJASZOZGYMM-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- JYZFTXWDXGDNJZ-UHFFFAOYSA-N 1-fluorobut-2-ene Chemical compound CC=CCF JYZFTXWDXGDNJZ-UHFFFAOYSA-N 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- ABQIAHFCJGVSDJ-UHFFFAOYSA-N 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)butan-2-one Chemical compound FC(F)(F)C(=O)C(F)(C(F)(F)F)C(F)(F)F ABQIAHFCJGVSDJ-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001983 electron spin resonance imaging Methods 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- -1 perfluoro-isoamyl ketone Chemical compound 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- VPAYJEUHKVESSD-UHFFFAOYSA-N trifluoroiodomethane Chemical compound FC(F)(F)I VPAYJEUHKVESSD-UHFFFAOYSA-N 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/16—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances gases
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention relates to a gas insulation detection technology of an electric power system, in particular to an insulation mixed gas and application thereof. The insulating mixed gas consists of a component 1 and a component 2, wherein the component 1 is trans-1, 4-hexafluoro-2-butene; said component 2 is selected from trans-2-chloro-3, 3-trifluoropropene, 3, -trifluoropropene or propane. The insulating mixed gas has quite excellent insulating performance as compared with sulfur hexafluoride and has lower GWP value; because the component 1 and the component 2 form the gas-like composite material with single gas characteristics, the liquefying temperature is reduced, and the advantages of the original gas such as insulating strength, low GWP and low toxicity are maintained. The insulating gas is particularly suitable for gas-insulated electrical transformers in the medium-high voltage field, gas-insulated wires for transporting or distributing electrical power, or connectors/disconnectors.
Description
Technical Field
The invention belongs to the technical field of gas insulation detection of power systems, and particularly relates to an insulation mixed gas for replacing sulfur hexafluoride.
Background
Sulfur hexafluoride is a colorless, odorless, nontoxic, strong electronegative gas which is used as an excellent insulating and arc extinguishing medium in gas insulated electrical equipment. However, sulfur hexafluoride has a high global warming potential and a low environmental performance index, and the greenhouse effect value of sulfur hexafluoride is 23900 times of that of carbon dioxide estimated by 100 years, and the sulfur hexafluoride is one of six greenhouse gases which are prohibited from being discharged and listed in the kyoto protocol. In 2016, the Paris agreement proposes that the lower half of the 21 st century achieve clean zero emission of greenhouse gases. Currently, sulfur hexafluoride concentration in the atmosphere is increasing at 8.7% per year, and sulfur hexafluoride emissions from the power industry are very high in total sulfur hexafluoride emissions. Therefore, the method for searching the sulfur hexafluoride with the insulating property equivalent to or even better than that of sulfur hexafluoride, and the gas with good environmental protection property and physicochemical property is used as the insulating medium to replace the sulfur hexafluoride, namely the sulfur hexafluoride replacing technology is developed, so that the method can radically reduce the use of the sulfur hexafluoride, and has very important significance.
Researchers at home and abroad actively search for sulfur hexafluoride (SF) 6 ) Is a substitute gas for the gas. The National Institute of Standards (NIST), the institute of Electric Power Research (EPRI), the japan institute of electrical and electronics, and the like comprehensively evaluate nearly hundred kinds of gases and binary or multi-component mixed gases thereof in terms of breakdown characteristics, breaking characteristics, chemical decomposition characteristics, and the like, screen out more than ten kinds of potential SF6 substitute gases, and propose application suggestions. Currently, potential sulfur hexafluoride substitute gases can be largely divided into three categories:
first category: using natural gas to replace SF 6 Gases such as carbon dioxide, nitrogen, dry air, but these natural gases have far less insulating properties than SF6 gas.
The second category: using sulfur hexafluoride mixed gas to replaceSulfur hexafluoride gas, e.g. SF 6 /N 2 、SF 6 /CO 2 、SF 6 /CF 4 Etc.; however, SF is used 6 The mixed gas can not fundamentally replace SF 6 Is used.
Third category: adopt environment-friendly insulating gas to replace SF 6 Gases such as octafluorocyclobutane (C-C4F 8), trifluoroiodomethane (CF 3I), heptafluoroisobutyronitrile (C4F 7N), perfluoropentacarbon (C5F 10O), 1, 3-tetrafluoropropene, and the like. The insulating gas has the defects of higher GWP value, higher liquefying temperature, higher toxicity and the like.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention provides an insulating mixed gas.
Therefore, the insulating mixed gas provided by the invention consists of a component 1 and a component 2, wherein the component 1 is trans-1, 4-hexafluoro-2-butene; said component 2 is selected from trans-1-chloro-3, 3-trifluoropropene, 3, -trifluoropropene or propane.
In an alternative, the insulating gas mixture has a similar single gas property, and the liquefaction temperature of the insulating gas mixture is less than the liquefaction temperature of each component in the gas mixture.
In an alternative scheme, the mass percentage of the component 1 is 11% -65%, and the mass percentage of the component 2 is 35% -88%.
In a further embodiment, the insulating mixed gas of the present invention further comprises a component 3, and the component 3 is selected from any one or a mixture of two or more of nitrogen, oxygen, air and carbon dioxide.
In an alternative scheme, the insulating mixed gas comprises the following components 1,2 and 3 in percentage by mass: 3% -61%: 22% -62%: 0.5 to 35 percent.
The insulating gas mixture of the invention can be applied to gas-insulated electrical transformers, gas-insulated wires for delivering or distributing electrical power, connectors or disconnectors. In a specific scheme, the working voltage of the insulating mixed gas is 3kV-35kV. The working voltage of the insulating mixed gas can also be 35kV-330kV. The working voltage of the insulating mixed gas can be 330-k V-1200kV.
The component 1 and the component 2 adopted by the invention belong to substances with the potential value of the greenhouse effect (GWP value); the component 1 trans-1, 4-hexafluoro-2-butene is sulfur-free and nitrogen-free hydrofluoroolefin, has a GWP value of 16, and has short atmospheric life, low toxicity and high insulating strength; in component 2, octafluorocyclobutane has a GWP value of 9540, trans-1-chloro-3, 3-trifluoropropene has a GWP value of 12,3,3,3, trifluoropropene has a GWP value of 9, and propane has a GWP of 3, all much lower than SF 6 GWP value (23900). Based on the above, the insulating mixed gas has good environmental protection performance, the ODP value is 0, and the GWP value is greatly reduced relative to sulfur hexafluoride.
The components and mixing proportion of the mixed gas can be determined based on a mixed gas screening method with similar single gas characteristics, so that the insulating gas similar to single substances in macroscopic property, namely, the insulating mixed gas with similar single gas characteristics is obtained, the mixed gas with the characteristics has unchanged component content when the gas leaks, the gas can be directly supplemented during maintenance of electrical equipment, other operations such as analysis and detection are not needed, and the obtained insulating mixed gas has lower liquefaction temperature relative to the independent components 1 and 2. Based on this, the insulating mixed gas of the present invention is excellent in heat resistance relative to perfluoro-isoamyl ketone (C 5 F 10 O), perfluoroisobutyronitrile, etc. with lower liquefaction temperatures.
In a further preferred embodiment, the insulating gas mixture according to the invention has excellent insulating strength, and the insulating properties are superior to or comparable to sulfur hexafluoride.
In a further scheme, the insulating mixed gas further comprises a component 3, wherein the component 3 is diluent gas, nitrogen, oxygen, air or carbon dioxide, and the gases are low-temperature greenhouse gases, wherein the GWP value of the nitrogen, the oxygen and the air is about 0, and the GWP value of the carbon dioxide is 1. Thus, the insulation gas composed of the component 1, the component 2 and the component 3 has the GWP value far lower than SF 6 。
Drawings
FIG. 1 shows simulation results of mixed gas screened and VLE experimental test results according to an embodiment of the present invention, with x as the abscissa i 。
Detailed description of the preferred embodiments
Unless specifically stated otherwise, scientific and technical terms herein have been understood based on the knowledge of one of ordinary skill in the relevant art. Based on the components 1 and 2, the mixed gas with specific components and specific proportion can be obtained based on the respective liquefaction temperature and greenhouse effect of the gases and aiming at reducing the liquefaction temperature and high environmental protection.
In a preferred embodiment, the composition and mixing ratio of the insulating gas mixture of the present invention can be determined based on a gas mixture screening method having similar single gas characteristics. In still other embodiments, an appropriate amount of component 3 may be mixed as a diluent gas as required to reduce the liquefaction temperature. A preferred example is that the insulating mixed gas comprises the following components 1,2 and 3 in percentage by mass: 3% -61%: 22% -62%: 0.5 to 35 percent.
The mixed gas screening method with similar single gas characteristics comprises the following steps:
s1, selecting insulating gas with the liquefaction temperature range of-40 ℃ to 20 ℃ under standard atmospheric pressure as a gas component; obtaining a plurality of gas components;
s2, under the condition of obtaining a given balance pressure P, at least one group T, x of the following formulas (1) - (16) is satisfied when the mixed gas of any two gas components i and j is in a gas-liquid balance state i 、y i 、x j And y j The method comprises the steps of carrying out a first treatment on the surface of the Wherein: the gas components i and j are any two gas components in the plurality of gas components obtained in the step S1; the given equilibrium pressure P takes the working pressure of SF6 gas, the unit of P being: MPa; t is the gas-liquid equilibrium temperature, and the unit is DEG C; x is x i Is the mole percent of the gas component i in the mixed gas phase; y is i Is the mole percent of the gas component i in the gas phase of the mixed gas; x is x j Is the mole percent of the gas component j in the mixed gas phase; y is j In the gas phase of the mixed gas as the mole of the gas component jPercentage; t is less than or equal to-40 ℃ and less than or equal to 20 ℃ and 0 DEG C<x i <1，0<y i <1，0<x j <1，0<y j <1, and x i +x j ＝1，y i +y j ＝1；
0.40000≤β 6 ≤0.50000，
0.30000≤β 7 ≤0.40000，
1.50000≤β 8 ≤1.60000，
0.20000≤β 9 ≤0.30000
In the formulae (1) to (16):
φ i V the gas phase loss of the gas component i in the mixed gas; phi (phi) i L Liquid-phase fugacity of the gas component i in the mixed gas;the gas phase loss of the gas component j in the mixed gas;
liquid-phase fugacity of the gas component j in the mixed gas;
r is a gas constant;
Z L as the gas phase compression factor of the mixed gas,Z V for the liquid phase compression factor of the mixed gas,V L the unit is m, which is the liquid phase mole volume of the mixed gas under the conditions of P and T 3 /mol；V V The unit is m, which is the gas phase molar volume of the mixed gas under the conditions of P and T 3 Mol; v is the volume of the mixed gas under the conditions of P and T, and the unit is m 3 ；
N i The molar quantity of the gas component i in the mixed gas is expressed in mol;
N j the molar quantity of the gas component j in the mixed gas is expressed in mol;
n is the total molar quantity of the mixed gas, and the unit is mol;
a and b are the state equation parameters of the mixed gas;
a i the molecular energy constant of the gas component i;
b i a volume correction constant for gas component i;
ω i is the eccentricity factor of the gas component i;
ω j is the eccentricity factor of gas component j;
T ri the temperature of the gas component i in the contrast state;
T ci the critical temperature of the gas component i; the unit is: k, performing K;
T cj is the critical temperature of the gas component j; the unit is: k, performing K;
p ci the critical pressure of the gas component i is given in: MPa;
p cj the critical pressure of the gas component j is given in: MPa;
k ij is a binary interaction parameter, 0<k ij <5；
P i sat The saturation vapor pressure of the gas component i at the temperature T is given by: MPa;
the saturation vapor pressure of the gas component j at the temperature T is given as: MPa;
is the free energy of the mixed gas;
V i L the unit is m, which is the volume of liquid phase of the gas component i under the conditions of P and T 3 ；
The unit is m, which is the volume of liquid phase of the gas component j under the conditions of P and T 3 ；
T/K is the temperature after the equilibrium temperature T is converted into Kelvin;
N gi all groups resolved for the molecules of gas component i;
N gj all groups resolved for the molecules of gas component j;
k represents any one of the groups resolved by the molecules of gas component i;
l represents any one of the groups resolved by the molecules of gas component j;
α ik the relative mole fraction of groups k of the gas component i is taken as the number of groups k divided by the total number of groups in the gas component i molecule;
α jk the relative mole fraction of the groups k of the gas component j is taken as the number of groups k divided by the total number of groups in the gas component j molecule;
α il the relative mole fraction of the groups l of the gas component i is taken as the number of the groups l divided by the total number of groups in the molecules of the gas component i;
α jl the relative mole fraction of the groups l of the gas component j is taken as the number of the groups l divided by the total number of groups in the molecules of the gas component j;
A kl and B is connected with kl Group parameters of the group k and the group l are respectively;
s3, screening the existence of the given balance pressure P according to the calculation result of S2: x is x i ＝y i The equilibrium temperature T is the minimum equilibrium temperature, and the minimum equilibrium temperature is less than the mixed gas of the liquefaction temperature of each gas component in the mixed gas.
The group resolved by the gas component molecule in the scheme, wherein the principle of resolution is as follows: the number of split groups is as small as possible, and the charge numbers among the groups are distributed uniformly as much as possible. Taking octafluorocyclobutane, 2, 3-tetrafluoropropene and 3, 3-trifluoropropene as examples, two gases were split: the resolution of octafluorocyclobutane resulted in 4 cyclic CF2 groups; the resolution of 3, 3-trifluoropropene resulted in 1 CF3 group and one hc=ch2 group.
The A is kl And B is connected with kl The specific values for this depend on the molecular structure of the two groups k and l, and can be obtained by the literature: calculation by the method disclosed in "Fluid-phase-equilibrium prediction of fluorocompound-containing binary systems with the predictive E-PPR78 model". Taking octafluorocyclobutane and 3, 3-trifluoropropene as examples, wherein cyclic CF2 groups and a of hc=ch2 groups are used kl And B is connected with kl The calculation method of (2) is described in detail in section 3.Database and reduction procedure of the literature.
In order to meet the use scenario of higher insulation strength, in a further preferred scheme, the mixed gas with the insulation strength greater than or equal to 1 is screened in the step S4 to serve as SF 6 Replacement gas for the gas.
S4, screening mixed gas with insulating strength larger than or equal to 1 from the mixed gas screened in S3 to be used as SF 6 A substitute gas for the gas; insulation strength of mixed gas e=e i x i +E j x j In the formula, E i For the insulating strength of the gas component i, E j Is the insulation strength of the gas component j, x i And x j And (3) taking the corresponding value in the screening condition in the step S3.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The components in the following examples are mixed under liquid phase conditions in such a manner that they are more easily weighed, but the present invention is not limited thereto, and the component gases of the present invention may be mixed in a gas phase or in a gas phase+liquid phase.
Example 1:
this example uses steps S1-S3 described above to determine the specific composition and proportions of component gas 1 and component gas 2 in the materials shown in table 1 (the gases listed in table 1 are part of the primary screening gas of the present invention or exemplary candidate ranges that also define the primary screening range of the present invention); ,
the screening result in the step S1 is as follows: octafluorocyclobutane (A), 3-trifluoropropene (B), trans-1, 3-tetrafluoropropene (C), and 2, 3-tetrafluoropropene (D), trans-1-chloro-3, 3-trifluoropropene (E), cis-1, 3-tetrafluoropropene (F) 1, 2-tetrafluoroethane (H), heptafluoroisobutyronitrile (I) 1,2, 3-heptafluoropropane (J), propane (K), and 1,2, 3-heptafluoropropane (J) propane (K); wherein, the liquefaction temperature of difluoromethane exceeds the temperature range of-40-20 ℃ and is not in the screening range;
table 1 step S1 screening gas combination results table
The relevant parameters of each gas component screened in step S1 are shown in table 2:
TABLE 2
Screening in 12 binary mixed gases by adopting the method of the steps S2 and S3 in MATLAB softwareThe mixed gas is selected, wherein P=0.1 MPa is adopted in the process (in other specific schemes, P can be valued according to the working pressure of the insulating gas, 0.1MPa is selected as an example for explaining the invention in detail, and the common working pressure of the insulating mixed gas is 0.1-0.5 MPa); beta 1 ＝-0.62323,β 2 ＝0.37464,β 3 ＝1.54226,β 4 ＝0.26992,β 5 ＝0.07780，β 6 ＝0.45724,β 7 ＝0.37464,β 8 ＝1.54226，β 9 = 0.26992; the screening results are shown in Table 3;
the partial results of the condition screening in the steps S2 and S3 are as follows: trans-1, 4-hexafluoro-2-butene + trans-1 chloro-3, 3-trifluoropropene trans-1, 4-hexa fluoro-2-butene +3, -trifluoropropene, trans-1, 4-hexafluoro-2-butene + propane, 3 total mixed gases.
TABLE 3 calculation results Table of combinations of screening gases at 0.1MPa for Steps S2 and S3
X in Table 3 i Is the mole fraction of the gas component trans-1, 4-hexafluoro-2-butene.
This example screens out trans-1, 4-hexafluoro-2-butene + trans-1-chloro-3, 3-trifluoropropene trans-1, 4-hexa fluoro-2-butene +3, the respective blending amounts of the trifluoropropene mixed gas as an insulating mixed gas having similar single gas characteristics are shown in Table 3.
It should be noted that the ratio determined in the steps S1 to S3 can be selected as a specific ratio of the present invention, and those skilled in the art can reasonably adjust the specific ratio of the component 1 and the component 2 based on the specific ratio by combining the factors such as the allowable error and the processing loss of the use environment. For example, in a specific embodiment, the optional mole fraction of trans-1, 4-hexafluoro-2-butene is 20% to 50%, with the remainder being component 2.
Example 2:
based on the above-described embodiment 1, further using the method described in the above S4 to calculate trans-1, 4-hexafluoro-2-butene + trans-1-chloro-3, 3-trifluoropropene trans-1, 4-hexafluoro-2-butene +3, the dielectric strength of the trifluoropropene mixture, trans-1, 4-hexafluoro-2-butene+propane is calculated as shown in Table 4; the insulating strength of the combination of trans-1, 4-hexafluoro-2-butene + trans-1-chloro-3, 3-trifluoropropene gas is greater than SF6 (SF 6 has an insulating strength of 1), trans-1, 4-hexa fluoro-2-butene +3, the dielectric strength of the gas combination of the trifluoropropene mixture is approximately equal to SF6.
As a preferred embodiment of the present invention, screening for trans-1, 4-hexafluoro-2-butene + trans-2-chloro-3, 3-trifluoropropene trans-1, 4-hexafluoro-2-butene +3, the trifluoropropene mixture gas serves as an insulating mixture gas having similar single gas properties.
The example was further screened to determine trans-1, 4-hexafluoro-2-butene + trans-2-chloro-3, 3-trifluoropropene as the insulating gas mixture. In a specific scheme, the optional mole fraction of the trans-1, 4-hexafluoro-2-butene is 40% -50%, and the balance is the component 2.
Table 4 step S3 screening gas combination results table
Simulation calculation experiment
Adopting a step S2 method in MATLAB software, verifying and calculating the vapor-liquid balance of trans-1, 4-hexafluoro-2-butene (component i) +trans-1-chloro-3, 3-trifluoropropene mixed gas under the condition of 100 KPa; the results of the verification calculations are shown in Table 5 and FIG. 1.
Further VLE experiments were performed on trans-1, 4-hexafluoro-2-butene + trans-1-chloro-3, 3-trifluoropropene; the results are shown in Table 5 and FIG. 1, and the experimental results are consistent with the simulation results, which shows that the screening results of the invention are reliable.
TABLE 5
At the same time as can be seen from figure 1, the trans-1, 4-hexafluoro-2-butene+trans-1-chloro-3, 3-trifluoro-screened by the invention propylene and trans-1, 4-hexafluoro-2-butene +1, 2, 3-heptafluoropropane gas, under the condition of 100KPa, conform to x i ＝y i And the minimum equilibrium temperature T is less than the liquefaction temperature of each gas component in the mixed gas.
As can be seen from FIG. 1, the combination of trans-1, 4-hexafluoro-2-butene + trans-1-chloro-3, 3-trifluoropropene gas screened in the present invention meets x under 100KPa conditions i ＝y i And the minimum equilibrium temperature T is less than the liquefaction temperature of each gas component in the mixed gas.
Example 3:
under the temperature condition of minus 20 ℃, taking 12 percent by mass of trans-1, 4-hexafluoro-2-butene and 88 percent by mass of propane to be physically mixed under the liquid phase condition, and obtaining the mixed insulating gas after complete gasification.
Example 4:
under the temperature condition of minus 30 ℃, 20 percent of trans-1, 4-hexafluoro-2-butene and 80 percent of propane are taken to be physically mixed under the liquid phase condition, and the mixed insulating gas is obtained after complete gasification.
Example 5:
at the temperature of-20 ℃, taking 30% by mass of trans-1, 4-hexafluoro-2-butene and 80% by mass of propane for physical mixing under the condition of liquid phase, and obtaining the mixed insulating gas after complete gasification.
Example 6:
under the temperature condition of minus 20 ℃, the trans-1, 4-hexafluoro-2-butene with the mass percent of 46% and the trans-1-chloro-3, 3-trifluoropropene with the mass percent of 54% are physically mixed under the liquid phase condition, and the environment-friendly insulating gas is obtained after complete gasification.
Example 7:
at the temperature of minus 15 ℃, the trans-1, 4-hexafluoro-2-butene with the mass percent of 54 percent and the trans-1-chloro-3, 3-trifluoropropene with the mass percent of 48 percent are physically mixed under the liquid phase condition, and the environment-friendly insulating gas is obtained after complete gasification.
Example 8:
under the temperature condition of minus 10 ℃, taking 65 percent by mass of trans-1, 4-hexafluoro-2-butene and 35 percent by mass of trans-1-chloro-3, 3-trifluoropropene for physical mixing under the liquid phase condition, and obtaining the mixed insulating gas after complete gasification.
Example 9:
under the temperature condition of minus 30 ℃, taking 31.4 percent of trans-1, 4-hexafluoro-2-butene by mass percent and 63.6 percent of propane by mass percent for physical mixing under the liquid phase condition, and filling 5 percent of nitrogen after complete gasification to obtain the mixed insulating gas.
Example 10:
under the temperature condition of minus 10 ℃, taking 42.3 percent of trans-1, 4-hexafluoro-2-butene and 22.7 percent of trans-1-chloro-3, 3-trifluoropropene by mass percent for physical mixing under the liquid phase condition, and after complete gasification, filling nitrogen with the mass percent of 35 percent to obtain the mixed insulating gas.
Example 11:
at the temperature of minus 10 ℃, taking 33.3 percent of trans-1, 4-hexafluoro-2-butene and 61.7 percent of trans-1-chloro-3, 3-trifluoropropene by mass percent for physical mixing under the condition of liquid phase, and filling 5 percent of nitrogen after complete gasification to obtain the mixed insulating gas.
Example 12:
under the temperature condition of minus 10 ℃, taking 62.9 percent of trans-1, 4-hexafluoro-2-butene and 35.1 percent of trans-1-chloro-3, 3-trifluoropropene by mass percent for physical mixing under the liquid phase condition, and after complete gasification, filling 5 percent of nitrogen by mass percent to obtain the mixed insulating gas.
Example 13:
under the temperature condition of minus 10 ℃, taking 62.9 percent of trans-1, 4-hexafluoro-2-butene and 35.1 percent of trans-1-chloro-3, 3-trifluoropropene by mass percent for physical mixing under the liquid phase condition, and filling 35 percent of air after complete gasification to obtain the mixed insulating gas.
Example 14:
under the temperature condition of minus 10 ℃, taking the trans-1, 4-hexafluoro-2-butene with the mass percent of 22.9 percent and the trans-1-chloro-3, 3-trifluoropropene with the mass percent of 35.1 percent for physical mixing under the liquid phase condition, and after complete gasification, filling oxygen with the mass percent of 35 percent to obtain the mixed insulating gas.
Example 15:
at the temperature of minus 20 ℃, 224.5 percent of trans-1, 4-hexafluoro-2-butene and 75 percent of 3, 3-trifluoropropene are taken to be physically mixed under the condition of liquid phase, and after complete gasification, 0.5 percent of air is filled to obtain the mixed insulating gas.
Example 16:
at the temperature of-20 ℃, taking 24.5% of trans-1, 4-hexafluoro-2-butene by mass percent and 75% of 3, 3-trifluoropropene by mass percent, physically mixing under the condition of liquid phase, completely gasifying, and then filling 0.5% of carbon dioxide to obtain the mixed insulating gas.
Comparative example 1:
the trans-1, 4-hexafluoro-2-butene with the mass percentage of 100 percent is used as insulating gas.
Comparative example 2:
the trans-1-chloro-3, 3-trifluoropropene with the mass percent of 100 percent is used as insulating gas.
Comparative example 3:
100% by mass of perfluoro-isopentanone (C) 5 F 10 O) as insulating gas.
Comparative example 4:
sulfur hexafluoride with the mass percent of 100 percent is used as insulating gas.
Comparative example 5:
the insulating gas is 100% by mass of propane.
Comparative example 6:
the insulating gas is 3, 3-trifluoropropene with the mass percent of 100 percent.
Further, after the liquid mixtures of examples 3 to 16 were completely gasified at room temperature, the insulating strength of the gases of examples 3 to 16 and all comparative examples with respect to SF6 gas was measured at a polar distance of 0.1 inch, and the results are shown in Table 6; wherein GWP is expressed as CO 2 As a reference value of 1.0 (100 years), the insulating strength uses sulfur hexafluoride as a reference value;
the liquefaction temperatures of the gases of examples 3 to 16 and comparative examples 1 to 6 were measured by an observation method, and the results are shown in Table 6; as is clear from Table 6, the ratio of the perfluoro-isopentanone (C 5 F 10 O), perfluoroisobutyronitrile, etc. the mixed gas of the present invention has a lower liquefaction temperature.
Table 6 environmental properties and dielectric strength comparison table
| Insulating gas | Relative to SF 6 Is of the insulating strength of (a) | GWP | Liquefaction temperature/DEGC |
| Example 3 | 0.68 | 3.14 | -38 |
| Example 4 | 0.71 | 3.25 | -36 |
| Example 5 | 0.75 | 3.41 | -35 |
| Example 6 | 1.37 | 5.51 | 7.5 |
| Example 7 | 1.39 | 5.66 | 7.6 |
| Example 8 | 1.44 | 5.99 | 7.8 |
| Example 9 | 0.68 | 3.14 | -42 |
| Example 10 | 1.13 | 5.99 | -25 |
| Example 11 | 1.17 | 5.25 | -21 |
| Example 12 | 1.08 | 5.66 | -25 |
| Example 13 | 1.08 | 5.66 | -25 |
| Example 14 | 1.08 | 5.66 | -25 |
| Example 15 | 0.93 | 5.03 | -34 |
| Example 6 | 0.93 | 5.03 | -34 |
| Comparative example 1 | 1.6 | 7 | 7.5 |
| Comparative example 2 | 1.21 | 4.5 | 19 |
| Comparative example 3 | 2 | 1 | 26.9 |
| Comparative example 4 | 1.21 | 23500 | -63.8 |
| Comparative example 5 | 0.65 | 3 | -39 |
| Comparative example 6 | 0.81 | 4 | -26 |
As can be seen from table 6, the insulation strength of the above example was comparable to or better than that of sulfur hexafluoride in terms of insulation properties; in the aspect of environmental protection performance, the greenhouse effect potential (GWP) value is far smaller than that of sulfur hexafluoride, and the environment protection requirement of reducing the global warming effect is met.
Claims (9)
1. An insulating mixed gas is characterized by comprising a component 1 and a component 2, wherein the component 1 is trans-1, 4-hexafluoro-2-butene; said component 2 is selected from trans-1-chloro-3, 3-trifluoropropene, 3, -trifluoropropene or propane.
2. The insulating gas mixture of claim 1, wherein the insulating gas mixture has a single gas-like character and the liquefaction temperature of the insulating gas mixture is less than the liquefaction temperature of each component of the gas mixture.
3. The insulating mixed gas according to claim 1, wherein the mass percentage of the component 1 is 11% to 65%, and the mass percentage of the component 2 is 35% to 88%.
4. The insulating mixed gas according to claim 1, further comprising a component 3, wherein the component 3 is selected from any one or a mixture of two or more of nitrogen, oxygen, air and carbon dioxide.
5. The insulating mixed gas according to claim 4, wherein the insulating mixed gas is composed of the following components 1,2 and 3 in percentage by mass: 3% -61%: 22% -62%: 0.5 to 35 percent.
6. Use of an insulating gas mixture according to any of claims 1-5 in a gas-insulated electrical transformer, a gas-insulated wire, a connector or a disconnector for transmitting or distributing electrical power.
7. The use according to claim 6, characterized in that: the working voltage of the insulating mixed gas is 3kV-35kV.
8. The use according to claim 9, characterized in that: the working voltage of the insulating mixed gas is 35kV-330kV.
9. The use according to claim 6, characterized in that: the working voltage of the insulating mixed gas is 330-k V-1200kV.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102300896A (en) * | 2009-02-03 | 2011-12-28 | 纳幕尔杜邦公司 | Foam-forming compositions containing mixtures of cis-1,1,1,4,4,4-hexafluoro-2-butene and 1,1,1,3,3-pentafluoropropane and their uses in the preparation of polyisocyanate-based foams |
| CN106663495A (en) * | 2014-07-03 | 2017-05-10 | 西门子公司 | Device and method for using 1,1,1,4,4,4-hexafluoro-2-butene as an electrically insulating and/or arc-extinguishing gaseous medium |
| US20180295675A1 (en) * | 2017-04-07 | 2018-10-11 | Abb Schweiz Ag | Insulation fluid heating apparatus and method |
| US20200056080A1 (en) * | 2017-08-29 | 2020-02-20 | Cac Shanghai International Trading Co., Ltd | Novel anhydrous heat transfer medium and application thereof |
| CN111211515A (en) * | 2020-01-10 | 2020-05-29 | 广东电网有限责任公司电力科学研究院 | Arc extinguishing and/or insulating electrical equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102300896A (en) * | 2009-02-03 | 2011-12-28 | 纳幕尔杜邦公司 | Foam-forming compositions containing mixtures of cis-1,1,1,4,4,4-hexafluoro-2-butene and 1,1,1,3,3-pentafluoropropane and their uses in the preparation of polyisocyanate-based foams |
| CN106663495A (en) * | 2014-07-03 | 2017-05-10 | 西门子公司 | Device and method for using 1,1,1,4,4,4-hexafluoro-2-butene as an electrically insulating and/or arc-extinguishing gaseous medium |
| US20180295675A1 (en) * | 2017-04-07 | 2018-10-11 | Abb Schweiz Ag | Insulation fluid heating apparatus and method |
| US20200056080A1 (en) * | 2017-08-29 | 2020-02-20 | Cac Shanghai International Trading Co., Ltd | Novel anhydrous heat transfer medium and application thereof |
| CN111211515A (en) * | 2020-01-10 | 2020-05-29 | 广东电网有限责任公司电力科学研究院 | Arc extinguishing and/or insulating electrical equipment |
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