CN109870330A - A kind of oil smoke on-line monitoring system - Google Patents
A kind of oil smoke on-line monitoring system Download PDFInfo
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- CN109870330A CN109870330A CN201910182112.6A CN201910182112A CN109870330A CN 109870330 A CN109870330 A CN 109870330A CN 201910182112 A CN201910182112 A CN 201910182112A CN 109870330 A CN109870330 A CN 109870330A
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Abstract
The invention discloses a kind of oil smoke on-line monitoring systems, mainly include Zero gas generator, air pump, jet flow negative pressure sampling apparatus, air flow regulator, sampling gun, Zero gas generator, sensing chamber, smoke detectors.The device is each attached to device housings, takes easily assembling to connect between device housings and the installation pedestal, and installation pedestal is permanently connected by way of pulling rivet and on the outside of tested pipeline, and to be inlaid with gasket airtight for the inside of installation pedestal.This kind of oil smoke on-line monitoring system is provided with Zero gas generator, it uses filtering material, it can be used for the pollutant removal in air, zero gas of the air as this system after removing pollutant, zero gas is the jet media that sample gas extracts, while being also the pure air source that dilution proportion is carried out to sample gas.Different from conventional sampling system, sample gas of the invention passes through the negative pressure extracting that zero gas jet stream generates, and sample gas is without air pump, therefore the present invention does not have the sampling pump on conventional meaning.
Description
Technical field
The present invention relates to oil smoke detection technique field, specially a kind of oil smoke on-line monitoring system.
Background technique
It improves with the continuous development of society, people all the more pay attention to environmental protection, also by various equipment and means
Environment in production and living is monitored, food and drink and the monitoring of industry lampblack are one of important branch.
Pollutants from cooking fume mainly includes fine particle and volatile organic matter (VOCs) two pollutant, and particulate matter measurement is logical
It is measured frequently with light scattering sensor, volatile organic matter (VOCs) generallys use semiconductor or electrochemical sensor carries out
Measurement.The initial concentration of pollutants from cooking fume is usually more than the best response section of the sensor, and high concentration particle object easily adheres to
On sensitive component surface, screen effect is formed, makes optical scatter object sensor rapid failure, damage, while sample aerated particle
When object very high concentrations, " self-absorption " effect can be generated, i.e. the light that scatters of particulate matter is by own absorption, working sensor at this time
In nonlinear area, the received optical signal of photosensitive element not can accurately reflect the actual concentration situation of sample gas.Conventional gas
Sampled measurements, sample gas can be by air pumps, and the pollutant in sample gas can damage air pump, can be made using simple filter type
At the unstability of system vapour lock.
The measurement object for containing high-adhesiveness pollutant for oil smoke class needs a kind of to overcome adopting for above-mentioned adverse effect
Sample and measuring device.
Summary of the invention
The purpose of the present invention is to provide a kind of oil smoke on-line monitoring systems, to solve oil mentioned above in the background art
The problems such as data caused by cigarette class high-adhesiveness pollutant monitoring object are inaccurate, sensor is vulnerable, air pump is easy to damage.
To achieve the above object, the invention provides the following technical scheme:
A kind of oil smoke on-line monitoring system, including Zero gas generator, air pump, jet flow negative pressure sampling apparatus, sample throughput tune
Regulating device, sampling gun and smoke detectors；The side of the Zero gas generator is provided with air pump, and the side of air pump is mounted with and penetrates
Negative pressure sampling apparatus is flowed, the upper end of the jet flow negative pressure sampling apparatus is equipped with sample air-flow quantity regulating device, and sample throughput tune
Sampling gun is inlaid with above regulating device, the side of the jet flow negative pressure sampling apparatus is connected with smoke detectors, the sampling
The side of rifle is circumscribed with pipeline；The sampling gun is straight, and sampling channel is tube.
Preferred: the oil smoke on-line monitoring system further includes cutter for particles, the cutter for particles both ends point
It is not connected with sample air-flow quantity regulating device and sampling gun.
Preferred: the particulate matter cut point of the cutter for particles is between 0.5 μm to 10 μm.
Preferred: the oil smoke on-line monitoring system further includes sensing chamber, and described sensing chamber one end and jet flow negative pressure sample
Device connection, the other end are communicated with the atmosphere, and detection interior is provided with smoke detectors and heating device.
Preferred: the sensing chamber is arranged in shell, and one end of shell is fixed with air inlet, and surface is provided with exhaust
Mouthful.
Preferred: the sampling gun includes ozzle, tube body, Guan Ji；The tube body side offers ozzle, and the tube body is remote
Side from the ozzle is fixedly connected with Guan Ji.
It is preferred: to be connected between the Zero gas generator and air pump by connecting tube, and air pump and jet flow negative pressure sample
It is connected between device by connecting tube.
Preferred: the side of the pipeline is mounted with installation pedestal, and the side of the installation pedestal is stamped with the first folded plate,
The other side of the installation pedestal is stamped with the second folded plate, and the top side of first folded plate is stamped with the first lug, institute
The top side for stating the second folded plate is stamped with the second lug, and the top two sides of first lug, which are run through, the first bar shaped
Hardy hole, the top two sides of second lug, which are run through, the second bar shaped hardy hole, passes through at the top of the installation pedestal
Fixed step riveting column, which presses, is fixed on the bottom of monitoring system shell, and the bottom of the installation pedestal is screwed in pipeline
Outside, the pipeline is socketed with gasket on the outside of the sampling pipe through there is sampling pipe.
It is preferred: to be connected together between the sampling gun and gasket, and to be fixed between gasket and installation pedestal
Connection.
Preferred: the two sides of the installation pedestal, which are run through, screw hole, and the screw hole is respectively distributed to installation pedestal
Quadrangle edge.
Compared with prior art, the beneficial effects of the present invention are: the oil smoke on-line monitoring system can measure in oil smoke simultaneously
The real-time concentration value of particulate matter and volatile organic matter (VOCs) two pollutant；The present invention makes to sense by reasonably designing
Device always works in best response section, improves the accuracy of data；Significantly extend sampling apparatus and measuring device
Maintenance period and service life；The quick despatch of on-line monitoring system is realized by the installation pedestal being permanently affixed on air hose.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of present system embodiment 1
The structural schematic diagram of Fig. 2 present system embodiment 2；
Fig. 3 is the structural schematic diagram of sampling gun of the present invention
Fig. 4 is the schematic diagram of housing structure of sensing chamber of the present invention；
Fig. 5 is inventive shell overlooking structure diagram；
Fig. 6 is present system mounting structure schematic diagram；
Fig. 7 is installation pedestal schematic view of the front view of the present invention；
Fig. 8 is installation pedestal overlooking structure diagram of the invention.
In figure: 1, Zero gas generator；2, air pump；3, jet flow negative pressure sampling apparatus；4, sample air-flow quantity regulating device；5, particle
Object cutter；6, sampling gun；61, ozzle；62, tube body；63, Guan Ji；7, sensing chamber；71, heating device；8, smoke detectors；
9, shell；10, air inlet；11, exhaust outlet；12, pipeline；13, installation pedestal；14, screw；15, system shell is monitored；16, close
Packing；17, fixed step riveting column；131, the first folded plate；132, the second folded plate；133, the second lug；134, the first lug；
1301, screw hole；1302, pipe through-hole is sampled；1331, the second bar shaped hardy hole；1341, the first bar shaped hardy hole.
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 needs
Illustrate, in the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more；Term " on ",
The orientation or positional relationship of the instructions such as "lower", "left", "right", "inner", "outside", " front end ", " rear end ", " head ", " tail portion " is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.
In addition, term " first ", " second ", " third " etc. are used for description purposes only, it is not understood to indicate or imply
Relative importance.
Meanwhile in the description of the present invention unless specifically defined or limited otherwise, term " connected ", " connection " should be done
It broadly understood, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connection,
It is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition, based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
Example one please refers to Fig. 1,3,6,7,8, and the present invention provides a kind of technical solution:
A kind of oil smoke on-line monitoring system: the oil smoke on-line monitoring system includes that Zero gas generator 1, air pump 2, jet stream are negative
Press sampling apparatus 3, sample air-flow quantity regulating device 4, sampling gun 6 and smoke detectors 8；The side of the Zero gas generator 1 is arranged
There is air pump 2, and the side of air pump 2 is mounted with jet flow negative pressure sampling apparatus 3, the upper end installation of the jet flow negative pressure sampling apparatus 3
There is sample air-flow quantity regulating device 4, and the top of sample air-flow quantity regulating device 4 is inlaid with sampling gun 6, the jet flow negative pressure sampling cartridge
The side for setting 3 is connected with smoke detectors 8, and the side of the sampling gun 6 is circumscribed with pipeline 12；The sampling gun 6 is straight, is adopted
Sample channel is tube.
Sampling gun 6 is horizontally installed in flue, and ozzle plane and flue interior air-flow direction are in parastate, the installation condition
(integrate) rifle (device) ozzle Plane Installation state with conventional sampling as plumbness, ozzle (acquisition port) object gas flow direction shape
State is entirely different.The sample gas of the present embodiment device is sucked out of flue by the negative pressure generated in jet flow negative pressure sampling apparatus
Sampling gun, once sample gas sucks sampling gun out of flue, air-flow under the action of negative pressure in sampling pipe be in constant speed state into
Enter detection device.
It is connected between Zero gas generator 1 and air pump 2 by connecting tube, and between air pump 2 and jet flow negative pressure sampling apparatus 3
It is connected by connecting tube.Zero gas generator 1 uses filtering material, can be used for going to decontaminate by the pollutant removal in air
Zero gas of the air as this system after contaminating object, zero gas are the jet media that sample gas extracts, while and to sample gas into
The pure air source of row dilution proportion.
Specifically, the sampling gun 6 includes ozzle 61, tube body 62, Guan Ji 63；62 side of tube body offers ozzle
61, the tube body 62 is fixedly connected with pipe base 63 far from the side of the ozzle 61.
Since pollutants from cooking fume mainly includes the submillimeter generated by mechanical dispersion (the miniature explosion of oil mixing with water containing high temperature)
The Asia that particulate matter (quantity partial size spectrum peak is in 100 μm of orders of magnitude), grease volatilization cohesion are generated with the cohesion of imperfect combustion product
Four classes such as the inorganic matter that micron particles object (quantity partial size spectrum peak is in the 10nm order of magnitude), volatile organic matter, burning generate.Its
The Submicron Particles that middle cohesion generates belong to airborne fine particulate matter scope, are typical PM2.5Pollutant is oil smoke plume
Producing reason, secondary volatility product are also one of the main source of oil smoke smell, therefore are the main of fume pollution detection
The most important pointer of object and fume pollution degree, oil smoke on-site test and oil smoke on-line monitoring are exactly mainly to detect oil smoke
The concentration of fine particle and volatile organic matter (VOCs).As previously mentioned, the sampling of oil smoke fine particle still uses at this stage
Isokinetic sampling's method, scene can not directly acquire the sample of oil smoke fine particle in real time.Main research staff of the invention for a long time from
The research of thing pollutants from cooking fume is that first, the whole world is related to the work of the full Size of kitchen fumes (nanometer to millimeter) analysis paper
One of person, by making the present invention to comprehensive analysis of kitchen fumes Size Distribution and ingenious application.Its principle is: meal
Drink smoke particle object from two entirely different the way of production, cause smoke particle object integrated distribution in two intermediate value grains
Near diameter, the particle size of condensed state is substantially focused on 10nm or so, and the smoke particle object that mechanical dispersion generates is substantially
100 μm or so are concentrated on, between the two substantially blank.When aerodynamic size is less than 1 μm, the behavior of particulate matter becomes
It is generally no longer general using aerodynamic size when aerodynamic size is less than 0.5 μm or less in air gaseous material feature
It reads, generallys use Stokes partial size concept, for partial size in the oil smoke fine particle of the 10nm order of magnitude, adopted without configuring constant speed
The thin-walled isokinetic sampling mouth in object gas flow direction needed for sample also can be realized accurate sampling, previous reasons is based on, using this hair
Bright oil smoke on-line detecting system, can omit the cutter for particles used in the prior art.Sample gas from thief hatch enter until into
Enter sampling gun, this distance because tube body presence, large particle in sample gas because gravity can natural subsidence in pipe
Wall, the remaining pollutant that can not be settled is detection device object to be detected, so that sampling pipe plays cutter
Effect is sampled using the accurate cutting that straight type sampling gun equally can be realized oil smoke fine particle.
Specifically, the length of the tube body is L, the sampling channel diameter of tube body is d, in which:
In formula: L---- sampling gun length (m), Q---- sample throughput (m3/ h), d---- sampling gun internal diameter (m), π ----
Pi.
Specifically, the diameter of the ozzle inner part sampling channel is in the sampling channel diameter for being equal to the tube body.
Specifically, the small sampling more than or equal to the tube body of the diameter of sampling channel of the ozzle at the tube body
Channel diameter.
Specifically, the side of the pipeline is mounted with installation pedestal 13, the side of the installation pedestal 13 is stamped with first
Folded plate 131, the other side of the installation pedestal 13 are stamped with the second folded plate 132, the top side punching press of first folded plate 131
There is the first lug 134, the top side of second folded plate 132 is stamped with the second lug 133, first lug
134 top two sides, which are run through, the first bar shaped hardy hole 1341, and the top two sides of second lug 133, which are run through,
Two bar shaped hardy holes 1331, the top of the installation pedestal 13 is pressed by fixed step riveting column 17 is fixed on monitoring system shell
15 bottom, the bottom of the installation pedestal 13 are fixed on the outside of the pipeline 12 by screw 14, and the pipeline 12 runs through
There is sampling pipe 6, the outside of the sampling pipe 6 is socketed with gasket 16.
Specifically, to be connected together between the sampling gun 6 and gasket 16, and gasket 16 and installation pedestal (13) it
Between to be fixedly connected.
Specifically, the two sides of the installation pedestal 13, which are run through, screw hole 1301, and the screw hole 1301 is distributed respectively
In the quadrangle edge of installation pedestal 13.
Fixed step riveting column 17 is respectively aligned to the first bar shaped hardy hole 1341 and the second bar shaped hardy hole 1331 when installation
Major diameter is touched downwards and clamping fixed lives equipment.When disassembly, the first bar shaped hardy hole 1341 of alignment and the second bar shaped are touched upwards
The major diameter of hardy hole 1331 removes equipment, and a sampling pipe through-hole 1302 and apertures in alignment on sampling pipe 6 are opened in installation pedestal 13, is given
Sampling pipe is given there are marginal space, disassembly is non-interference with sampling pipe when sliding；By gasket between installation pedestal 13 and equipment
16 is airtight.
Specifically, the smoke detectors include testing result uploading system, can will test in real time data handled, on
It passes.
Example two please refers to Fig. 2,3,6,7,8, is with one difference of embodiment, and a kind of oil smoke on-line monitoring system is described
Oil smoke on-line monitoring system further includes cutter for particles 5, the both ends respectively with sample air-flow quantity regulating device 4 and sampling gun 6
It is connected.The oil smoke on-line monitoring system further includes sensing chamber 7, and described 7 one end of sensing chamber and jet flow negative pressure sampling apparatus 3 connect
It connects, the other end is communicated with atmosphere, and smoke detectors 8 are provided in sensing chamber 7.Sensing chamber 7, which has, further expands diluted sample gas
Dissipate homogeneous, buffer gas flow pulsation, the effect of equilibrium air pressure.
Specifically, the particulate matter cut point of the cutter for particles 5 is between 10nm and 100 μm.Optimal, 0.5 μ
Between m to 10 μm.The characteristics of due to pollutants from cooking fume, if you need to cut two class particulate matter of oil smoke, cut point selection exists
Any point between 10nm and 100 μm, cutting effect substantially indifference, therefore the matched air pump constant speed feature of cutter is limited
It is fixed just significantly to relax --- within the scope of the extremely wide speed of exhaust, cutter can collect true oil smoke fine particle
Sample.
Example three please refers to Fig. 4,5, a kind of oil smoke on-line monitoring system, and the oil smoke on-line monitoring system further includes inspection
Room 7 is surveyed, described 7 one end of sensing chamber is connect with jet flow negative pressure sampling apparatus, and the other end is communicated with the atmosphere, and detection interior is provided with cigarette
Gas sensor 8 and heating device 71.The sensing chamber 7 is arranged in shell 9, and one end of shell 9 is fixed with air inlet 10, and table
Face is provided with exhaust outlet 11.Can reduce air-flow pulse, buffer gas flow, balance box body in and external atmosphere pressure, increase detection accuracy.
Working principle: monitoring system is assembled by relevant monitoring assembly first for this kind of oil smoke on-line monitoring system
Inside shell 15, installation pedestal 13 is fixed on pipeline 12 by screw 14, then sampling gun 6 is placed into installation pedestal 13
It is interior, make sampling gun 6 from the gasket 16 in installation pedestal 13 through pipeline 12 in, sampling gun 6 is located in installation pedestal 13,
Pedestal 13 and monitoring system shell 15 is fixedly mounted in fixed step riveting column；Booster air pump 2, air pump 2 increase the gas in this system
Mobilization force admits air into Zero gas generator 1, and Zero gas generator 1 uses filter membrane or filter pulp, and can be used for will be in air
Particulate matter removal, zero gas of the air as this system after removing particulate matter, zero gas enter in jet flow negative pressure sampling apparatus 3,
And sampling gun 6 is contacted with oil smoke, and in 3 contraction section of jet flow negative pressure sampling apparatus, flow section reduces, according to Venturi effect, this
When gas will be to be sprayed by jet orifice at a high speed, and swiftly flowing fluid nearby will generate low pressure, i.e. jet orifice in figure at this time
Stronger negative pressure will be generated in neighbouring cavity, oil smoke enters sampling by the suction function in system, along sampling gun 6
In rifle 6, enter back into cutter for particles 5, cutter for particles 5 according to demand, to particle size size in sample gas into
The controllable selection of row, enters back into sample air-flow quantity regulating device 4, the side that sample air-flow quantity regulating device 4 passes through adjusting sample throughput
Method in a certain range accurately controls dilution ratio, and oil smoke is entered back into after evenly mixing in sensing chamber 7, sensing chamber 7
Interior overflow section product increases, and gas flow rate reduces, while the pressure relief opening communicated with atmosphere is provided in sensing chamber 7, and pressure relief opening can
The work of air pump 2 pressure oscillation caused by gas is excluded, it is made to remain close with atmospheric pressure, such be provided with is conducive to pass
The steady operation of sensor air inlet always works at sensor under the ideal operation environment of its own, extra gas is led to
It while crossing pressure relief opening discharge, enters back into smoke detectors 8, a variety of particulate matters, gas analysis in smoke detectors 8 pass
Sensor is detected and analyzed oil smoke.
System can also increase the information transmission system, alarm system etc., and analysis result can be will test by the information transmission system
Information be transmitted in alarm system, if exceeded, alarm system can alarm, and complete entire oil smoke like this and supervise online
The use process of examining system.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of oil smoke on-line monitoring system, it is characterised in that: the oil smoke on-line monitoring system include Zero gas generator (1),
Air pump (2), jet flow negative pressure sampling apparatus (3), sample air-flow quantity regulating device (4), sampling gun (6) and smoke detectors (8)；It is described
The side of Zero gas generator (1) is provided with air pump (2), and the side of air pump (2) is mounted with jet flow negative pressure sampling apparatus (3), institute
The upper end for stating jet flow negative pressure sampling apparatus (3) is equipped with sample air-flow quantity regulating device (4), and sample air-flow quantity regulating device (4)
Top is inlaid with sampling gun (6), and the side of the jet flow negative pressure sampling apparatus (3) is connected with smoke detectors (8), the sampling
The side of rifle (6) is circumscribed with pipeline (12)；The sampling gun (6) is straight, and sampling channel is tube.
2. a kind of oil smoke on-line monitoring system according to claim 1, it is characterised in that: the oil smoke on-line monitoring system
Further include cutter for particles (5), cutter for particles (5) both ends respectively with sample air-flow quantity regulating device (4) and sampling
Rifle (6) is connected.
3. a kind of oil smoke on-line monitoring system according to claim 2, it is characterised in that: the cutter for particles (5)
Particulate matter cut point between 0.5 μm to 10 μm.
4. a kind of oil smoke on-line monitoring system according to claim 1, it is characterised in that: the oil smoke on-line monitoring system
It further include sensing chamber (7), described sensing chamber (7) one end is connect with jet flow negative pressure sampling apparatus, and the other end is communicated with the atmosphere, detection
Interior is provided with smoke detectors (8) and heating device (71).
5. a kind of oil smoke on-line monitoring system according to claim 4, it is characterised in that: sensing chamber (7) setting exists
In shell (9), one end of shell (9) is fixed with air inlet (10), and surface is provided with exhaust outlet (11).
6. a kind of oil smoke on-line monitoring system according to claim 1, it is characterised in that: the sampling gun (6) includes pipe
Mouth (61), tube body (62), Guan Ji (63)；Tube body (62) side offers ozzle (61), and the tube body (62) is far from described
The side of ozzle (61) is fixedly connected with Guan Ji (63).
7. a kind of oil smoke on-line monitoring system according to claim 1, it is characterised in that: the Zero gas generator (1) with
Air pump is connected between (2) by connecting tube, and is connected between air pump (2) and jet flow negative pressure sampling apparatus (3) by connecting tube
It connects.
8. a kind of oil smoke on-line monitoring system described in Arbitrary Term in -7 according to claim 1, it is characterised in that: the pipeline
(12) side is mounted with installation pedestal (13), and the side of the installation pedestal (13) is stamped with the first folded plate (131), the peace
The other side of dress pedestal (13) is stamped with the second folded plate (132), and it is convex that the top side of first folded plate (131) is stamped with first
It rises side (134), the top side of second folded plate (132) is stamped with the second lug (133), first lug
(134) top two sides, which are run through, the first bar shaped hardy hole (1341), and the top two sides of second lug (133) are passed through
It is installed with the second bar shaped hardy hole (1331), the top of the installation pedestal (13) is pressed by fixed step riveting column (17) to be fixed on
The bottom of system shell (15) is monitored, the pipeline (12) is fixed on by screw (14) in the bottom of the installation pedestal (13)
Outside, the pipeline (12) are socketed with gasket (16) on the outside of the sampling pipe (6) through having sampling pipe (6).
9. a kind of oil smoke on-line monitoring system according to claim 8, it is characterised in that: the sampling gun (6) and sealing
It to be connected together between pad (16), and is to be fixedly connected between gasket (16) and installation pedestal (13).
10. a kind of oil smoke on-line monitoring system according to claim 8, it is characterised in that: the installation pedestal (13)
Two sides, which are run through, to be had screw hole (1301), and the screw hole (1301) is respectively distributed to the quadrangle edge of installation pedestal (13).
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| CN110456006A (en) * | 2019-09-12 | 2019-11-15 | 北京市劳动保护科学研究所 | Pollutant emission monitors system in burst accident |
| CN112781969A (en) * | 2019-11-06 | 2021-05-11 | 中国石油化工股份有限公司 | Gas dilution device and method for online monitoring |
| CN113252846A (en) * | 2021-04-30 | 2021-08-13 | 西北工业大学 | Method and equipment for monitoring gas concentration of oil smoke VOCs (volatile organic compounds) for long-time continuous monitoring |
| CN113804518A (en) * | 2021-09-28 | 2021-12-17 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | High-purity and ultra-pure gas high-fidelity sampling device and method |
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| CN113804518A (en) * | 2021-09-28 | 2021-12-17 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | High-purity and ultra-pure gas high-fidelity sampling device and method |
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