CN109276976A - A kind of recyclable device and method of sulfur hexafluoride and nitrogen mixed gas - Google Patents
A kind of recyclable device and method of sulfur hexafluoride and nitrogen mixed gas Download PDFInfo
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- CN109276976A CN109276976A CN201811479346.9A CN201811479346A CN109276976A CN 109276976 A CN109276976 A CN 109276976A CN 201811479346 A CN201811479346 A CN 201811479346A CN 109276976 A CN109276976 A CN 109276976A
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- sulfur hexafluoride
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- 239000007789 gas Substances 0.000 title claims abstract description 274
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 138
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 116
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 60
- 238000012806 monitoring device Methods 0.000 claims abstract description 27
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims description 32
- 239000012528 membrane Substances 0.000 claims description 16
- 238000001764 infiltration Methods 0.000 claims description 13
- 230000008595 infiltration Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 claims description 6
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 239000005864 Sulphur Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000008246 gaseous mixture Substances 0.000 claims description 2
- 208000027418 Wounds and injury Diseases 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000000505 pernicious effect Effects 0.000 abstract description 2
- 210000004027 cell Anatomy 0.000 description 9
- 238000005070 sampling Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012958 reprocessing Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- OEERIBPGRSLGEK-UHFFFAOYSA-N carbon dioxide;methanol Chemical compound OC.O=C=O OEERIBPGRSLGEK-UHFFFAOYSA-N 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/225—Multiple stage diffusion
- B01D53/226—Multiple stage diffusion in serial connexion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0044—Sulphides, e.g. H2S
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/10—Nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Physics & Mathematics (AREA)
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Abstract
The present invention discloses the recyclable device and method of a kind of sulfur hexafluoride and nitrogen mixed gas.The apparatus structure is as follows: the entrance access sulfur hexafluoride and nitrogen mixed gas, the first outlet of separator of separator are connect with the entrance of sulfur hexafluoride liquefying plant, and the outlet of sulfur hexafluoride liquefying plant is connect with sulfur hexafluoride storage device；The second outlet of separator and the entrance of exhaust gas processing device connect；The outlet of exhaust gas processing device is connect with offgas outlet, the first solenoid valve and tail gas recycle access are provided on the connecting path of exhaust gas processing device and offgas outlet, tail gas monitoring device is set to the exit of exhaust gas processing device, for monitoring the concentration of sulfur hexafluoride in exit, and according to the on off operating mode of concentration of sulfur hexafluoride adjusting the first solenoid valve and second solenoid valve.The present invention can be with pernicious gas content in accurate measurements tail gas, it is ensured that exhaust emissions reaches safety standard, avoids the personal injury and environmental pollution of field personnel.
Description
Technical field
The present invention relates to gas recycling fields, more particularly to the recyclable device of a kind of sulfur hexafluoride and nitrogen mixed gas
And method.
Background technique
Sulfur hexafluoride (SF6) gas because of its excellent insulation arc extinction performance, is widely used in power industry.However hexafluoro
The greenhouse effects for changing sulphur are significant, are to be prohibited one of 6 kinds of greenhouse gases of discharge, thus need to be subject in use stringent
Control.To adapt to new International Environmental Protection requirement, greenhouse gas emission is reduced, domestic and international power grid enterprises start using SF6/N2Mixing
The pure six-component force balance gas of gas instead, to reduce sulfur hexafluoride gas dosage.
In the application, work as SF6/N2When mixed gas electrical equipment is overhauled, disintegrates or is retired, it is necessary to in equipment
SF6Mixed gas is recycled.Pure SF6Gas is easy liquefaction, SF6Gas is generally canned in liquid form when recycling
Storage.And because containing and SF in the mixed gas6Considerable amount of N2When, because of N2It is difficult to liquefy under normal conditions, it is difficult to direct liquid
Change recycling, it is necessary to use dedicated SF6/N2Mixed gas recyclable device.SF6/N2Mixed gas recyclable device quickly will at the scene
SF6And N2Separation, SF after separation6The recycling of direct liquefaction filling bottle, N2Wherein remaining SF after processing6Less than safety limit
It can directly be discharged when (1000ppm).Standard GB/T/T 28534-2012 is " six in high-tension switch gear and control equipment
Sulfur fluoride (SF6) gas release to environment and health influence " in require SF in working environment6The maximum allowable limit value of gas
For 1000ppm.
Existing SF6/N2The separative efficiency of mixed gas recyclable device is by items such as polymeric membrane two sides gas pressure, temperature
Part influences very big.It under complicated work on the spot environment, often will appear the fluctuation of gaseous mass after separation, or even tail gas occur
Middle SF6The exceeded phenomenon of content, to the tail gas (N of discharge2) in SF6Content can not determine, not can guarantee discharged N2Meet peace
Full discharge standard endangers Field Force's safety, influences atmospheric environment.
Summary of the invention
The object of the present invention is to provide the recyclable devices and method of a kind of sulfur hexafluoride and nitrogen mixed gas, to guarantee to arrange
The N put2Meet safety dumping standard.
To achieve the above object, the present invention provides following schemes:
A kind of recyclable device of sulfur hexafluoride and nitrogen mixed gas, comprising: separator, sulfur hexafluoride liquefying plant,
Sulfur hexafluoride storage device, exhaust gas processing device, tail gas monitoring device, the first solenoid valve, offgas outlet, second solenoid valve and
One compressor；
The entrance access sulfur hexafluoride and nitrogen mixed gas of the separator, the first outlet of the separator with
The entrance of the sulfur hexafluoride liquefying plant connects, and the outlet of the sulfur hexafluoride liquefying plant and sulfur hexafluoride storage fill
Set connection；The second outlet of the separator is connect with the entrance of the exhaust gas processing device；The exhaust gas processing device
Outlet is connect with the offgas outlet, and the exhaust gas processing device exporting and being provided on the connecting path of the offgas outlet
First solenoid valve；The separator is used to separate the sulfur hexafluoride gas in the sulfur hexafluoride and nitrogen mixed gas
Body, the sulfur hexafluoride gas after separation enters the sulfur hexafluoride liquefying plant by the first outlet, remaining after separation
Mixed gas enters the exhaust gas processing device by the second outlet；
The exhaust gas processing device is for handling the sulfur hexafluoride gas in mixed gas；The vent gas treatment dress
Tail gas recycle access, the entrance of the tail gas recycle access are additionally provided on the connecting path of the outlet and the offgas outlet set
It accesses between the outlet of the exhaust gas processing device and first solenoid valve, described in the outlet access of the tail gas recycle access
Between the second outlet of separator and the entrance of the exhaust gas processing device；The entrance of the tail gas recycle access and outlet
Between be disposed with the second solenoid valve and first compressor；
The tail gas monitoring device is set to the exit of the exhaust gas processing device, for monitoring the vent gas treatment dress
The concentration of sulfur hexafluoride in exit is set, and adjusts described first according to the concentration of sulfur hexafluoride in the exhaust gas processing device exit
The on off operating mode of solenoid valve and the second solenoid valve；The on off operating mode phase of first solenoid valve and the second solenoid valve
Instead.
Optionally, the separator is hollow-fibre membrane.
Optionally, the sulfur hexafluoride liquefying plant specifically includes: the second compressor and refrigeration machine；Six after the separation
Sulfur fluoride gas is successively liquefied as liquid by the compressor and the refrigeration machine.
Optionally, the exhaust gas processing device is seperation film or adsorption tanks；The seperation film is big to the infiltration rate of nitrogen
In the infiltration rate to sulfur hexafluoride；The adsorption tanks are for adsorbing sulfur hexafluoride gas.
Optionally, the tail gas monitoring device obtains the to be measured of the exhaust gas processing device exit by bypassing pump suction type
Gas.
Optionally, the tail gas monitoring device includes electric air pump, gas sample cell, gas sensor, data communication network
Network and host；The electric air pump is used to the under test gas in the exhaust gas processing device exit being pumped into the gas sample cell
In；The gas sensor is set in the gas sample cell, for the concentration to sulfur hexafluoride in the under test gas into
Row detection；The host receives the concentration numbers of the sulfur hexafluoride of the gas sensor detection by the data communication network
According to；The host is used to adjust first solenoid valve and the second solenoid valve according to the concentration data of the sulfur hexafluoride
On off operating mode.
Optionally, the recyclable device of the sulfur hexafluoride and nitrogen mixed gas further includes display screen, the display screen
Data control terminal is connect with the host, concentration data of the display screen for sulfur hexafluoride described in real-time display.
The present invention also provides the recovery methods of a kind of sulfur hexafluoride and nitrogen mixed gas, comprising:
Sulfur hexafluoride is separated with the sulfur hexafluoride gas in nitrogen mixed gas；
Sulfur hexafluoride gas after separation is liquefied, and the sulfur hexafluoride after liquefaction is stored to sulfur hexafluoride and is stored
Device；
Mixed gas remaining after separation is subjected to vent gas treatment in exhaust gas processing device, obtains that treated wait be vented
Body；
Obtain the concentration of sulfur hexafluoride wait be vented in body；
Whether the judgement concentration of sulfur hexafluoride wait be vented in body is greater than given threshold；
If it is, closing the first solenoid valve at offgas outlet, the second solenoid valve on tail gas recycle access is opened, it will
The body further progress vent gas treatment to be vented；
If it is not, then opening the first solenoid valve at offgas outlet, the body to be vented is arranged by the offgas outlet
Out, and the second solenoid valve on the tail gas recycle access is closed.
Optionally, the concentration of sulfur hexafluoride wait be vented in body is obtained, later further include:
The concentration of sulfur hexafluoride wait be vented in body is shown on display screen.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The invention firstly uses separators and exhaust gas processing device to SF6/N2Sulfur hexafluoride gas in mixed gas into
Row processing, and then utilize tail gas monitoring device accurate measurements SF6/N2Mixed gas after processing wait be vented pernicious gas in body
The content of sulfur hexafluoride, and then discharge and reprocessing process can be automatically controlled according to monitoring data, it is ensured that exhaust emissions can
Reach safety standard, avoids the personal injury and environmental pollution of field personnel.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the recyclable device of sulfur hexafluoride of the present invention and nitrogen mixed gas；
Fig. 2 is the structural representation of tail gas monitoring device in the recyclable device of sulfur hexafluoride of the present invention and nitrogen mixed gas
Figure；
Fig. 3 is the flow diagram of the recovery method of sulfur hexafluoride of the present invention and nitrogen mixed gas.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the structural schematic diagram of the recyclable device of sulfur hexafluoride of the present invention and nitrogen mixed gas.As shown in Figure 1, packet
Include: separator 1, sulfur hexafluoride liquefying plant 2, sulfur hexafluoride storage device 3, exhaust gas processing device 4, tail gas monitoring device 5,
First solenoid valve 6, offgas outlet 7, second solenoid valve 8 and the first compressor 9.
The entrance of the separator 1 accesses sulfur hexafluoride (SF6) and nitrogen (N2) mixed gas；The separator 1 is used
In to SF6/N2SF in mixed gas6Gas is separated.Separator carries out SF by polymeric membrane6And N2Separation, point
From rear SF6Concentration is greater than 95%.SF in the present invention6Gas and N2Separator using nonporous membrane (also known as homogeneous membrane)
Penetration mechanism.Gas component under pressure, is dissolved in the surface of film in the high-pressure side of film first, then along dense in film
Gradient absorption, dissolution, diffusion, precipitation, evolution are spent, the other side (infiltration 13 side of mouth) of film is transmitted to, realizes two kinds of component gas
Separation.
Table 1 divides perforated membrane gas separation membrane characteristic
From above-mentioned table 1 as it can be seen that in order to improve the gas transit dose of organic nonporous membrane, it is necessary to increase infiltration coefficient, pressure
Difference and film surface product and reduction film thickness.Herein, it in order to improve the separative efficiency of mixed gas, has to select infiltration coefficient
The biggish film of difference, that is, wish that film has higher selectivity and biggish permeability to component A a certain in gaseous mixture, and to another group
B only has lower selectivity and lesser permeability, could obtain relatively satisfactory purification effect in this way.
In order to increase UF membrane surface area, membrane separator (assembly unit) structure mountain plate and frame is increased to spiral wound, pipe
Formula is so that hollow fiber form, and every to improve a kind of structure, separation surface area increases in geometric progression amount, with hollow fiber form seperation film
Largest surface area.
Select hollow-fibre membrane in the present invention, material is polycarbonate, the membrane in use, predominant gas with
The gas separation factor α that need to be separated, which is greater than 3, to be separated, (the unit 10 of seepage velocity parameter list 2 of predominant gas- 6scc/cm2CmHgsec):
2 predominant gas infiltration rate table of table
| Gas | H2O_V | SO2 | H2 | He | H2S | CO2 | MeOH | O2 | Ar |
| Infiltration rate | 2000 | 400 | 210 | 150 | 110 | 81 | 20.8 | 18 | 6.9 |
| Gas | C2H4 | CO | CH4 | N2 | C2H6 | Xe | SF6 | ||
| Infiltration rate | 4 | 4.17 | 2.4 | 2.4 | 1.4 | 0.5 | 0.04 |
When mix insulation gas quickly recycles, predominant gas is by SF6And N2Composition, there are also some other educt gas or
Impurity, these gases and SF6Separation factor α such as table 3:
3 SF of table6The separation factor of gas and relevant gaseous components
| Gas | H2O_V | SO2 | H2S | CO2 | CO | N2 |
| Separation factor | 50000 | 10000 | 2750 | 2025 | 104.25 | 60 |
As shown in Table 3, these gas separation factors are much larger than 3, can using the membrane separator with the hollow-fibre membrane
High-efficient purification separates SF6With other foreign gases.
The first outlet of the separator 1 is connect with the entrance of the sulfur hexafluoride liquefying plant 2, the sulfur hexafluoride
The outlet of liquefying plant 2 is connect with the sulfur hexafluoride storage device 3.Sulfur hexafluoride gas after separation by first outlet into
Enter sulfur hexafluoride liquefying plant 2 to liquefy, then be stored by sulfur hexafluoride storage device 3.Sulfur hexafluoride liquefying plant 2 includes
Second compressor and refrigeration machine；Concentration is greater than 95% SF after separation6Gas successively passes through compressor and refrigeration machine, through being overpressurized
Freezing can liquefy, stored in sulfur hexafluoride storage device 3 with liquid, when run up to it is a certain amount of after be transferred in steel cylinder.
The second outlet of the separator 1 is connect with the entrance of the exhaust gas processing device 4, after separator 1 separates
Remaining mixed gas enters the exhaust gas processing device 4 by second outlet.Remaining mixed gas (is largely after separation
N2) in SF6Residual volume is higher, is unable to direct emission, is reprocessed in exhaust gas processing device 4.Exhaust gas processing device 4 is separation
Film or adsorption tanks.Seperation film increases level-one macromolecule membrane, using seperation film to SF6And N2Infiltration rate difference (seperation film
It is greater than the infiltration rate to sulfur hexafluoride to the infiltration rate of nitrogen), by SF6It is retained down, to make tail gas N2Middle SF6Contain
Amount is greatly reduced, and reaches processing intent.Adsorption tanks, i.e., using adsorbent to SF6Selective absorption, by SF6It removes, it is also reachable
To vent gas treatment purpose.
The outlet of the exhaust gas processing device 4 is connect with the offgas outlet 7, the outlet of the exhaust gas processing device 4 with
First solenoid valve 6 is provided on the connecting path of the offgas outlet 7.The outlet of the exhaust gas processing device 4 with it is described
Tail gas recycle access is additionally provided on the connecting path of offgas outlet 7, the entrance of the tail gas recycle access accesses the tail gas
Between the outlet of processing unit 4 and first solenoid valve 6, the outlet of the tail gas recycle access accesses the separator 1
Second outlet and the exhaust gas processing device 4 entrance between；Between the entrance and outlet of the tail gas recycle access successively
It is provided with the second solenoid valve 8 and first compressor 9.The tail gas monitoring device 5 is set to the vent gas treatment dress
The exit for setting 4, for monitoring the concentration of sulfur hexafluoride in 4 exit of exhaust gas processing device, and according to the vent gas treatment
The concentration of sulfur hexafluoride in 4 exit of device adjusts the on off operating mode of first solenoid valve 6 and the second solenoid valve 8；It is described
First solenoid valve 6 is opposite with the on off operating mode of the second solenoid valve 8.
The exit of exhaust gas processing device 4 is arranged in tail gas monitoring device 5, obtains vent gas treatment dress by bypass pump suction type
The under test gas in 4 exits is set, does not influence the pressure and flow of main gas circuit.Under test gas enters the inspection in tail gas monitoring device 5
It surveys device (such as infrared sensor or halogen sensor), obtains N2Middle SF6Gas concentration, and real time data is shown on a display screen.When
The SF of detection6When concentration is greater than given threshold, recyclable device automatically cuts off the first solenoid valve 6, opens second solenoid valve 8 and compression
Machine 9, tail gas returns to exhaust gas processing device 4 and is reprocessed, until SF in tail gas6Content is opened again when being down to given threshold or less
First solenoid valve 6 closes second solenoid valve 8 and the first compressor 9, continues to continue tail gas emptying.Tail gas monitoring device 5 uses mould
Blockization design transmits Real-time Monitoring Data by connection, can also integrally remove, facilitate the regular of entire tail gas monitoring device
It calibrates or metrological service is sent to verify.
The specific structure of tail gas monitoring device 5 in the present invention is illustrated below with reference to Fig. 2, Fig. 2 is hexafluoro of the present invention
Change the structural schematic diagram of tail gas monitoring device in the recyclable device of sulphur and nitrogen mixed gas.As shown in Fig. 2, tail gas monitoring device
It include: electric air pump, gas sample cell, gas sensor, data communication network and host；The electric air pump is used for will be described
The under test gas in exhaust gas processing device exit is pumped into the gas sample cell；The gas sensor is set to the gas
In sample cell, detected for the concentration to sulfur hexafluoride in the under test gas；The host passes through the data communication
Network receives the concentration data of the sulfur hexafluoride of the gas sensor detection；The host is used for according to the sulfur hexafluoride
Concentration data adjusts the on off operating mode of first solenoid valve and the second solenoid valve.
Tail gas monitoring device carries out bypass sampling after exhaust gas processing device.This sampling and measuring mode does not influence main gas circuit
Pressure and flow, avoid influence prime separative efficiency；On the other hand flow and the pressure for entering gas sample cell are constant, can
Guarantee the accuracy of gas sensor detection.It drives gas to enter sample cell by electric air pump, gas is set in gas sample cell
Body sensor is to SF in tail gas6Gas is detected, and infrared sensor, halogen sensor etc. can be used in gas sensor.Pass through
Data transmission network will test data and upload to host.Entire recyclable device can automatically control exhaust emissions according to detection data
With reprocessing process, it is ensured that exhaust emissions is attained by safety standard, avoids the personal injury of field personnel and environment dirty
Dye.
Recyclable device of the present invention further includes display screen, and the data control terminal of the display screen is connect with the host, described
Concentration data of the display screen for sulfur hexafluoride described in real-time display.
The invention has the following advantages that
1, in SF6/N2Tail gas monitoring device is arranged in mixed gas recyclable device, to SF in tail gas6Residual volume is supervised in real time
It surveys, detection data can be shown in recyclable device control flow, and staff is facilitated to obtain tail-gas quality information.
2, the SF that recyclable device is detected according to tail gas monitoring device6Content data carries out exhaust emissions and recycles reprocessing
Gas circuit control.Work as SF6When residual volume is big, the first solenoid valve is cut off, opens second solenoid valve and the first compressor, tail gas returns to tail
Flash Gas Compression Skid System is reprocessed；As SF in tail gas6After content is down to safety dumping standard, the first solenoid valve is opened, closes the
Two solenoid valves and the first compressor carry out tail gas emptying.
3, tail gas monitoring device includes that pump suction type sampling part and detection part are not influenced using bypass pump suction type sampling
The pressure and flow of main gas circuit.On the other hand bypass sampling guarantees that the flow for entering sample cell and pressure are constant, avoids influencing gas
The accuracy in detection of body sensor.SF6Detection part can select infrared sensor, halogen sensor etc..
4, tail gas monitoring device uses modularized design, can integrally remove from recyclable device, facilitate detector regular
It calibrates or metrological service is sent to verify.
The recovery method of above-mentioned recyclable device progress sulfur hexafluoride and nitrogen mixed gas is used as shown in figure 3, Fig. 3 is this
The flow diagram of the recovery method of invention sulfur hexafluoride and nitrogen mixed gas.Specifically includes the following steps:
Step 100: sulfur hexafluoride is separated with the sulfur hexafluoride gas in nitrogen mixed gas.
Step 200: the sulfur hexafluoride gas after separation being liquefied, and the sulfur hexafluoride after liquefaction is stored to hexafluoro
Change sulphur storage device.
Step 300: mixed gas remaining after separation being subjected to vent gas treatment in exhaust gas processing device, after obtaining processing
Body to be vented.
Step 400: obtaining the concentration of sulfur hexafluoride wait be vented in body；
Step 500: judging whether the concentration of sulfur hexafluoride wait be vented in body is greater than given threshold；If so, executing step
600；If not, executing step 700.
Step 600: the first solenoid valve at offgas outlet is closed, the second solenoid valve on tail gas recycle access is opened, it will
Body further progress vent gas treatment to be vented.
Step 700: opening the first solenoid valve that offgas outlet goes out, body to be vented is discharged by offgas outlet, and closes
Second solenoid valve on tail gas recycle access.
In above-mentioned steps, the execution sequence of step 200 and step 300- step 700 can operate simultaneously without successively.In step
After 400 further include: the concentration of sulfur hexafluoride wait be vented in body is shown on display screen.
Specific implementation process of the invention approximately as:
SF6/N2Mixed gas (volume fraction 30%SF6/ 70%N2) enter recyclable device, pass through high score in separator
Sub- film carries out SF6And N2Separation, SF after separation6Concentration is greater than 95%, into SF6Liquefying plant is filling to SF after being liquefied6
In storage device.N after separation2Into exhaust gas processing device, N at this time2Middle SF6Residual volume is higher, is unable to direct emission, in tail gas
Processing unit is reprocessed by seperation film or adsorption tanks.Tail gas monitoring device is arranged in processing unit exit, passes through side
The sampling of road pump suction type, does not influence the pressure and flow of main gas circuit.Gas enters detector (such as infrared biography in tail gas monitoring device
Sensor or halogen sensor), obtain N2Middle SF6Gas concentration, and in the control screen display real time data of recyclable device.Work as inspection
The SF of survey6When concentration is greater than given threshold (such as 800ppm), recyclable device automatically cuts off the first solenoid valve, opens the second electromagnetism
Valve and the first compressor, tail gas returns to exhaust gas processing device and is reprocessed, until SF in tail gas6Content be down to given threshold with
The first solenoid valve will be opened when lower again, closes second solenoid valve and the first compressor, continues to continue tail gas emptying.It is each in this specification
A embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, respectively
Same and similar part may refer to each other between a embodiment.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (9)
1. the recyclable device of a kind of sulfur hexafluoride and nitrogen mixed gas characterized by comprising separator, sulfur hexafluoride
Liquefying plant, sulfur hexafluoride storage device, exhaust gas processing device, tail gas monitoring device, the first solenoid valve, offgas outlet, second
Solenoid valve and the first compressor；
The entrance access sulfur hexafluoride and nitrogen mixed gas of the separator, the first outlet of the separator with it is described
The entrance of sulfur hexafluoride liquefying plant connects, and the outlet of the sulfur hexafluoride liquefying plant and the sulfur hexafluoride storage device connect
It connects；The second outlet of the separator is connect with the entrance of the exhaust gas processing device；The outlet of the exhaust gas processing device
It connect, is provided in the outlet of the exhaust gas processing device and the connecting path of the offgas outlet described with the offgas outlet
First solenoid valve；The separator is used to separate the sulfur hexafluoride gas in the sulfur hexafluoride and nitrogen mixed gas, point
Sulfur hexafluoride gas from after enters the sulfur hexafluoride liquefying plant, remaining gaseous mixture after separation by the first outlet
Body enters the exhaust gas processing device by the second outlet；
The exhaust gas processing device is for handling the sulfur hexafluoride gas in mixed gas；The exhaust gas processing device
Tail gas recycle access, the entrance access of the tail gas recycle access are additionally provided in outlet and the connecting path of the offgas outlet
Between the outlet of the exhaust gas processing device and first solenoid valve, the outlet of the tail gas recycle access accesses the separation
Between the second outlet of device and the entrance of the exhaust gas processing device；Between the entrance and outlet of the tail gas recycle access according to
It is secondary to be provided with the second solenoid valve and first compressor；
The tail gas monitoring device is set to the exit of the exhaust gas processing device, goes out for monitoring the exhaust gas processing device
Concentration of sulfur hexafluoride at mouthful, and first electromagnetism is adjusted according to the concentration of sulfur hexafluoride in the exhaust gas processing device exit
The on off operating mode of valve and the second solenoid valve；First solenoid valve is opposite with the on off operating mode of the second solenoid valve.
2. the recyclable device of sulfur hexafluoride according to claim 1 and nitrogen mixed gas, which is characterized in that the separation
Device is hollow-fibre membrane.
3. the recyclable device of sulfur hexafluoride according to claim 1 and nitrogen mixed gas, which is characterized in that the hexafluoro
Change sulphur liquefying plant to specifically include: the second compressor and refrigeration machine；Sulfur hexafluoride gas after the separation successively passes through described
Compressor and the refrigeration machine are liquefied as liquid.
4. the recyclable device of sulfur hexafluoride according to claim 1 and nitrogen mixed gas, which is characterized in that the tail gas
Processing unit is seperation film or adsorption tanks；The seperation film is greater than the infiltration rate to sulfur hexafluoride to the infiltration rate of nitrogen；
The adsorption tanks are for adsorbing sulfur hexafluoride gas.
5. the recyclable device of sulfur hexafluoride according to claim 1 and nitrogen mixed gas, which is characterized in that the tail gas
Monitoring device obtains the under test gas in the exhaust gas processing device exit by bypassing pump suction type.
6. the recyclable device of sulfur hexafluoride according to claim 1 and nitrogen mixed gas, which is characterized in that the tail gas
Monitoring device includes electric air pump, gas sample cell, gas sensor, data communication network and host；The electric air pump is used
It is pumped into the gas sample cell in by the under test gas in the exhaust gas processing device exit；The gas sensor is set to
In the gas sample cell, detected for the concentration to sulfur hexafluoride in the under test gas；The host passes through described
Data communication network receives the concentration data of the sulfur hexafluoride of the gas sensor detection；The host is used for according to described six
The concentration data of sulfur fluoride adjusts the on off operating mode of first solenoid valve and the second solenoid valve.
7. the recyclable device of sulfur hexafluoride according to claim 6 and nitrogen mixed gas, which is characterized in that the hexafluoro
The recyclable device for changing sulphur and nitrogen mixed gas further includes display screen, and the data control terminal of the display screen and the host connect
It connects, concentration data of the display screen for sulfur hexafluoride described in real-time display.
8. the recovery method of a kind of sulfur hexafluoride and nitrogen mixed gas characterized by comprising
Sulfur hexafluoride is separated with the sulfur hexafluoride gas in nitrogen mixed gas；
Sulfur hexafluoride gas after separation is liquefied, and the sulfur hexafluoride after liquefaction is stored to sulfur hexafluoride to store and is filled
It sets；
Mixed gas remaining after separation is subjected to vent gas treatment in exhaust gas processing device, the body to be vented that obtains that treated；
Obtain the concentration of sulfur hexafluoride wait be vented in body；
Whether the judgement concentration of sulfur hexafluoride wait be vented in body is greater than given threshold；
If it is, closing the first solenoid valve at offgas outlet, the second solenoid valve on tail gas recycle access is opened, it will be described
Body further progress vent gas treatment to be vented；
If it is not, then opening the first solenoid valve at offgas outlet, the body to be vented is discharged by the offgas outlet, and
Close the second solenoid valve on the tail gas recycle access.
9. the recovery method of sulfur hexafluoride according to claim 8 and nitrogen mixed gas, which is characterized in that described in acquisition
Concentration of sulfur hexafluoride wait be vented in body, later further include:
The concentration of sulfur hexafluoride wait be vented in body is shown on display screen.
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