CN105562204B - Flue gas purification device and method for trapping PM2.5-PM10 in advancing magnetic field by means of magnetic porous media - Google Patents
Flue gas purification device and method for trapping PM2.5-PM10 in advancing magnetic field by means of magnetic porous media Download PDFInfo
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- CN105562204B CN105562204B CN201511020808.7A CN201511020808A CN105562204B CN 105562204 B CN105562204 B CN 105562204B CN 201511020808 A CN201511020808 A CN 201511020808A CN 105562204 B CN105562204 B CN 105562204B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/025—High gradient magnetic separators
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Abstract
The invention belongs to the technical field of coal-fired flue gas treatment, and particularly relates to a flue gas purification device and method for trapping PM2.5-PM10 in an advancing magnetic field by means of magnetic porous media. A plurality of magnetic generators are arranged in the flue gas purification device for trapping PM2.5-PM10 in the advancing magnetic field by means of the magnetic porous media. Each magnetic generator comprises a pair of magnet exciting coils. The magnet exciting coils are connected with a multi-channel direct current stabilization power source. The current intensity and the power-on time of the multi-channel direct current stabilization power source are adjusted, and therefore the magnetic field intensity of different positions of a flue gas pipeline can be controlled, and whether a magnetic field exists at different positions of the flue gas pipeline or not can be controlled. By means of the coupling function of electromagnetic attraction force, gravity and gas drag force, the magnetic porous media are driven to trap and separate PM2.5-PM10 particles in flue gas. According to the flue gas purification device and method, the beneficial effects of high separation efficiency, environment friendliness and energy saving are achieved on the PM2.5-PM10 particles in the flue gas.
Description
Technical field
The invention belongs to coal-fired flue-gas Treatment process field, and in particular to magnetic porous medium trapping in a kind of traveling magnetic field
The smoke eliminator and method of PM2.5-PM10.
Background technology
Currently, national most area occurs in that different degrees of haze air pollution problems inherent.And cause air pollution
One of the main reasons is exactly to produce substantial amounts of subparticle during the coal-fired industries such as thermoelectricity, heating, iron and steel are produced to arrange to air.And work as
It is front due to lacking for the industry standard of PM2.5-PM10 fine dusts grade dust-collection efficiency in flue gas, and existing dedusting skill
Art is not for the solid phase particles better dust removal effect of more than PM10, but universal to the subparticle efficiency of dust collection in flue gas high, because
This, is to solve one of main path of air pollution for the flue gas of commercial production discharge carries out fine dedusting, needs exploitation one
Plant the high-effective dust-removing cleaning equipment for the subparticle in industrial coal flue gas.
It is domestic at present quiet for the predominantly organic tool dedusting of industrial dedusting, wet dust removal, electrostatic precipitation, bag-type dust and cloth bag
Close dedusting technology etc. in Electricity Federation.Dust removal with machine is the technology using gravity, inertia force and centrifugal action dedusting.But dust removal with machine
The larger dust of granule is primarily directed to, more than 50 μm of bulky grain can only be typically removed.Removal efficiency for PM10 is only
Have 30%, thus it is limited for the purification of subparticle for dust removal with machine, typically just as the primary of high effect dust cleaner
Cleaner unit.
Wet dust removal is that the subparticle in dust-contained airflow separating flue is washed using drop.Can process high-temp waste gas,
Stickiness granule and drop.But due to particle diameter less than 2.5 μm subparticle and water droplet all there is one layer of air film, subparticle is very
Difficulty is wet, so the efficiency of dust collection for PM2.5 only has 70%, and the technology high energy consumption, and produces secondary pollution, investment
It is higher.
Bag-type dusting is come the granule in trap filter flue gas using porous filter material.For the trapping of subparticle
There is very high efficiency, the efficiency of dust collection for more than PM10 is more than or equal to 99%, but the gas containing pole fine dusts PM2.5
It is most of to pass through filter bag, and as filtrate is subject to the problem of high temperature and corrosion, cloth bag cracky even to burn, affect production
Seriality and gas cleaning.Additionally due to the dust content in flue gas is high, running resistance constantly increases, and operating cost is also higher.
Electrostatic precipitation is charged to the dust granules in flue gas, makes dust granules with flue gas point in the presence of electric field force
From.The technology can process low temperature, low pressure to high temperature, the flue gas of high pressure, and the pressure loss is little when processing flue gas.This method
It is higher to the capture rate of bulky grain pollutant, but for 2.5 μm of dust is smaller in size than, the efficiency of electrostatic precipitator will be anxious
It is acute to decline.Dust for 0.5～2.5 μm, when worst, efficiency can be less than 50%.And the charged difficulty of subparticle, ratio resistance
It is difficult to reach requirement；Reentrainment of dust can be caused after rapping, and the trapping of the metallurgical furnace flue dust larger to exhaust gas volumn far can not
Reach standard；In addition whole dust arrester needs high-voltage transforming and rectifying installation, and investment and operating cost are all higher.
Cloth bag electrostatic mechanical and hydraulic combined dust technology be after electrostatic precipitation along with bag-type dust, electrostatic precipitation be separated by filtration compared with
Big dust granules, bag-type dusting are separated by filtration subparticle.Mechanical and hydraulic combined dust technology efficiency of dust collection has reached 99%, but still has about
1% dust has been entered in air, and in this 1% dust, less than 2.5 microns, the ultra-fine grain of even submicron order is accounted for particle diameter
More than the 90% of the flying dust sum of escape.In addition cloth of the ozone that electrostatic precipitation part produces possibly for bag-type dusting below
There is serious infringement in bag, and the shortcoming of bag type dust removing technology is yet suffered from.So several dedusting technologies are for fine above
The dust removing effects of granule all have much room for improvement.
With the development of porous material, many people start to consider using porous media to be separated by filtration flue gas.Someone
Porous ceramicss and porous metals are utilized to be used for udst separation as filter layer, dedusting aggregate efficiency can reach more than 99%.But
Porous media filter layer cannot be applied to flue gas fine particulate removal link at present, mainly due to filtering for porous media
For material, mutually restrict between pore property and military service performance, have that conflict, i.e. aperture are less, porosity is higher, more
Be conducive to trapping ultra-fine particles, filtering accuracy is higher；But the thing followed is that fluid transit dose is less, more easily causes height
Pressure drop even block.Although porous material fixed form is filtered can utilize in fine dedusting, as hole is inhaled
Attached easily saturation, needs frequently to change porous material filtrate, is not suitable for processing a large amount of flue gases that industrial coal is produced.
To sum up shown, a kind of pressure loss of urgent need exploitation is little, investment and operating cost are low, is adapted to electrostatic precipitation or pocket type
The high-level cleaner of the fine dedusting after dedusting, directly solves and the healthy closely bound up smoke evacuation of the people from source
The atmosphere polluting problem that middle PM2.5-PM10 is caused.
The content of the invention
For the problem that prior art is present, during the present invention provides a kind of traveling magnetic field, magnetic porous medium traps PM2.5-
The smoke eliminator and method of PM10, it is therefore an objective to by playing the fine dedusting with high gradient magnetic separator and porous media
The advantage that device is filtered, with high throughput lower resistance, efficient fine dedusting, and porous media can be recycled, and to dust
Temperature, ratio resistance etc. is without requiring.
Realize the smoke eliminator of magnetic porous medium trapping PM2.5-PM10 in the traveling magnetic field of the object of the invention, bag
A flue is included, described flue front end is provided with magnetic porous feed pipe inlet, end is provided with drainage screen, cigarette
Several magnetic field generators are set between the front end and end of feed channel, and each described magnetic field generator includes a cavity,
Flue is passed through from the middle of cavity, has been divided into magnetic field and without magnetic field, the cavity of magnetic field generator by magnetic field generator
Two ends wind magnet exciting coil, and magnet exciting coil is connected with corresponding multiple-channel output current stabilization DC source, and cavity two ends are additionally provided with cooling
Blower fan.
Using the smoke eliminator trapping PM 2.5- of magnetic porous medium trapping PM2.5-PM10 in above-mentioned traveling magnetic field
The flue gas purifying method of PM10 is followed the steps below：
Multiple-channel output current stabilization DC source is opened, and magnetic porous Jie is added in the magnetic porous feed pipe inlet of flue
Flue gas after electrostatic precipitation or bag-type dusting is introduced flue by matter, adjusts multiple-channel output current stabilization DC source
Output current and conduction time, traveling magnetic field or the pulsed magnetic field along flue direction is obtained, magnetic field has horizontal and vertical
Magnetic field gradient, the PM 2.5-PM10 granules in magnetic porous medium and flue gas are moved simultaneously, and inertial collision, concrete dynamic modulus occur
Retention and Blang's diffusive interception, the PM 2.5-PM10 granules in magnetic porous medium dynamic trapping flue gas, through having magnetic field and
Intercept through filter screen when flue end is eventually arrived at without magnetic field, realize separating clean gas, will trapping PM 2.5-PM10
Magnetic porous medium ultrasonic wave water washing, pickling after granule, again washing, be dried after, obtain the magnetic porous medium being desorbed, then
In secondary loading flue, realize recycling.
Wherein, described magnetic porous medium is the porous iron or nickel porous of Jing electrochemical treatments, its particle size diameter ＜
1mm, described drainage screen aperture are less than the diameter of magnetic porous medium.
The range of accommodation of described electrical current is 5A～30A, and described conduction time is 1s～3600s.
Compared with prior art, the characteristics of of the invention and beneficial effect are：
It is provided with some in the smoke eliminator of magnetic porous medium trapping PM2.5-PM10 in the traveling magnetic field of the present invention
Individual magnetic field generator, each magnetic field generator include a pair of magnet exciting coils, and magnet exciting coil is connected with multi-channel DC stabilized current supply,
By the current intensity and the conduction time that adjust multi-channel DC stabilized current supply, can realize controlling the magnetic of flue diverse location
Field intensity is weak and whether there is magnetic field, can obtain traveling magnetic field or pulsed magnetic field along horizontal direction, magnetic field can produce laterally or
The high magnetic field gradients of longitudinal direction, are both provided with fan up and down in magnetic field generator, magnet exciting coil are carried out air-cooled.Apparatus of the present invention
Flue front end is provided with magnetic porous medium entrance also, and pipe end is provided with filter screen, PM has been loaded for intercepting
The magnetic porous medium of 2.5-PM10 granules.
The present invention abandons traditional dedusting method and fixed porous media filter type for the trapping of particulate matter in gas
Mode, such as directly intercept, put up a bridge intercept, coalescence and gravitational settling, creatively provide it is a kind of using electromagnetic attraction, gravity and
The coupling of gas drag come the device of the PM 2.5-PM10 granules in driving the trapping of magnetic porous medium, separating flue and
Method, magnetic porous medium are moved when flue gas is supported similarly hereinafter with the granule that is captured, and are expanded by inertial collision, retention and Blang
Dissipate and intercept the mode for realizing dynamic trapping.This is that, as gas viscosity is minimum, molecule transfer rate is high, greatly improves granule
Collision opportunity so that inertial collision becomes the basic mode of solids trapping in gas filtration, and on the other hand, Brownian movement increases
The chance for having added fine grained to be trapped by porous material, has the most by trapping of the molecular collision to fine grained (0.1～0.3 μm)
Imitate, therefore Blang's diffusive interception is taken place mostly in gas filtration.
Traditional filtration mechanism or subparticle coalescence mechanism add as the fine particle in flue gas is not necessarily with magnetic
Power-up magnetic field will not significantly increase coalescence probability, and only by coalescence effect trapping fine particle, its effect is limited, with traditional filtering side
Formula is compared, and in the present invention, flue gas stream is not forced through filter material (porous media), but magnetic porous medium is driven in electromagnetic field
Move in flue gas under dynamic, the load of fluid resistance and porous media is reduced while fine particle is trapped, by increasing magnetic
Property porous media concentration, control the time of staying of magnetic porous medium in magnetic field, to realize that the Long travel of porous media is controllable
Motion, can not only greatly increase arresting efficiency, simultaneously because the porous media of load subparticle is easily recycled, can after desorption
Recycle, its economic feasibility will not be reduced.
The magnetic porous media particle of flue is admitted in the inventive method under the action of a magnetic field, curtain shape is formed, is used
In dynamic trapping PM 2.5-PM10 granules, the magnetic porous medium that flue gas stream is helped is subject to during with air motion
Electromagnetic force and the coupling of gravity buoyancy in traveling magnetic field and there is no substantially sedimentation, even by adjusting magnetic field parameter,
Realize that magnetic porous medium is moved back and forth perpendicular to airflow direction in flue, increase its controlled stroke and which is greatly improved with gas
The collision probability of PM2.5-PM10 granules in stream, realizes that magnetic porous medium is caught for the dynamic high-efficiency of PM 2.5-PM10 granules
Collection, flue end have filter screen, can intercept magnetic porous medium, realize that magnetic porous medium is separated with clean gas, most
Afterwards by magnetic porous medium through ultrasonic wave water washing, pickling, again washing, be dried after, obtain the porous magnetic medium being desorbed, it is real
Now recycle.
Description of the drawings
Fig. 1 is the gas cleaning dress of magnetic porous medium trapping PM2.5-PM10 in the traveling magnetic field in the embodiment of the present invention
The structural representation put；
Fig. 2 is the Section A-A figure of Fig. 1；
Fig. 3 is the section B-B figure of Fig. 1；
Wherein：1：Ash-laden gas；2：Flue；3：Three tunnels export current stabilization DC source；4：Magnetic porous medium charging
Mouthful；5：Magnetic field generator；6：Cooling blower；7：Clean gas；8：Drainage screen；9：Magnet exciting coil；a：There is magnetic field；b：Without magnetic field
Section；
Fig. 4 is the stroke route schematic diagram of magnetic porous medium in the embodiment of the present invention in flue.
Specific embodiment
The embodiment of the present invention traps PM2.5- with magnetic porous medium in the traveling magnetic field with three magnetic field generators
Illustrate as a example by the smoke eliminator of PM10, its structure as shown in FIG. 1 to 3, including a flue 2, described
2 front end of flue be provided with magnetic porous feed pipe inlet 4, end is provided with drainage screen 8, the front end and end of flue 2
3 magnetic field generators 5 are set between end, and each described magnetic field generator 5 includes a cavity, and flue 2 is from cavity
Between pass through, flue 2 has been divided into magnetic field a and without magnetic field b by magnetic field generator, cavity two ends winding magnet exciting coil 9,
Magnet exciting coil 9 exports current stabilization DC source 3 with three tunnels and is connected, and cavity two ends are additionally provided with cooling blower 7.
In the present embodiment the internal diameter of flue be 180mm, external diameter be 200mm, length is 2m, each magnetic field generator water
Square to length be 240mm, three tunnels output current stabilization DC source is commercial, model：3-KDP4800, with nickel porous as magnetic
Property porous media, the porosity of porous media is ε=50%.
Caught using the smoke eliminator of magnetic porous medium trapping PM2.5-PM10 in the traveling magnetic field of embodiment
The flue gas purifying method of collection PM2.5-PM10 is followed the steps below：
Three tunnels output current stabilization DC source 3 is opened, is added in the magnetic porous feed pipe inlet of flue 4 magnetic porous
Ash-laden gas 1 after electrostatic precipitation or bag-type dusting is introduced flue 2 by medium, adjusts three tunnels output current stabilization straight
The output current of stream power supply and conduction time, output current intensity I=20A is set in the present embodiment, now flue 2 is having
Central magnetic field intensity B=1222Gs of magnetic field, in vertical direction, magnetic field gradient is right up and down on the basis of horizontal center line
Claim, and increased with the amplitude of 4Gs/cm upwards, in horizontal direction, gradient is symmetrical on the basis of vertical center line,
And reduced to both sides with the amplitude of 27.5Gs/cm；
In the first paragraph magnetic field that magnetic porous medium is produced into first magnetic field generator 5, magnetic porous medium is subject to
Move in magnetic field under the coupled in common effect of gravity and magnetic field force, ash-laden gas is by magnetic porous medium region, profit
With the PM 2.5-PM10 granules in the big advantage trapping dusty gas of the high porosity of magnetic porous medium, specific surface area；In magnetic
Under field action, magnetic porous medium is moved simultaneously with the PM 2.5-PM10 granules in flue gas, inertial collision, concrete dynamic modulus occurs and cuts
Stay and Blang's diffusive interception, the PM 2.5-PM10 granules in magnetic porous medium dynamic trapping flue gas；
In the present embodiment give first paragraph magnetic field run time be 1s, second segment magnetic field run time be 2s, the 3rd section of magnetic
Field run time is 3s, and total run time is 6s, gives the initial velocity v=0.3m/s of magnetic porous nickel, and which is in flue
In movement locus it is as shown in Figure 4；
The current intensity and run time that magnetic field is adjusted in embodiment controls the motion of magnetic porous nickel, makes magnetic porous nickel
Movement travel in first paragraph magnetic field is longer, and the longer time rests on the first magnetic field, and the contact with dusty gas more fills
Point, so as to the trapping for carrying out the first stage in first paragraph magnetic field；
Magnetic porous nickel from first paragraph magnetic field out after in the flue 2 experience first paragraph without magnetic field stroke, magnetic is more
The nickel parabolic motion that does forward affected by gravity in hole is made into second segment magnetic field stroke by adjusting magnetic field intensity and gradient
The magnetic porous nickel that must be moved downward under magneticaction is moved upwards or is travelled forward, so that porous media is at utmost
Ground covers most of region of flue 2, increases the time of staying, continues the subparticle in trapping dusty gas；
Magnetic porous nickel from second segment magnetic field out afterwards enter second segment without magnetic field, magnetic porous nickel without magnetic field after
The continuous parabolic motion that does forward causes magnetic many by adjusting magnetic field intensity and gradient in the 3rd section of magnetic field in traveling magnetic field
The movement locus of hole nickel cover the most areas of flue 2 again and movement time is longer, magnetic porous nickel and PM
The contact probability and trapping effect of 2.5-PM10 granules is further improved；
When final stage eventually arrives at 2 end of flue without magnetic field, the magnetic of PM 2.5-PM10 granules is loaded
Nickel porous are intercepted by drainage screen 8, realize separating clean gas, will be the magnetic porous nickel after trapping PM 2.5-PM10 granules ultrasonic
Ripple washing, pickling, again washing, be dried after, obtain be desorbed magnetic porous nickel, be again loaded into 2 in flue, realize circulation
Use.
With the weightening after the trapping PM 2.5-PM10 granules of magnetic porous nickel and PM 2.5-PM10 in the flue gas being passed through
Gross weight ratio characterizes total efficiency of dust collection, and the dynamic of the final present invention traps the fine dedusting dress of PM 2.5-PM10 granules in flue gas
Put dust-collecting efficiency and reach more than 80%；
To clean dust-laden solution wet method laser particle size instrument measurement grade dust-collection efficiency after nickel porous, actual verification classification is removed
Dirt is in hgher efficiency, is more easy to adsorb micro- PM2.5.
Claims (4)
1. in a kind of traveling magnetic field, magnetic porous medium traps the smoke eliminator of PM2.5-PM10, it is characterised in that including one
Bar flue, is provided with magnetic porous feed pipe inlet in described flue front end, and end is provided with drainage screen, fume pipe
Several magnetic field generators are set between the front end and end in road, each magnetic field generator includes a cavity, flue from
Pass through in the middle of cavity, magnetic field has been divided into and without magnetic field by magnetic field generator, the cavity two ends winding of magnetic field generator is encouraged
Magnetic coil, magnet exciting coil are connected with corresponding multiple-channel output current stabilization DC source, and cavity two ends are additionally provided with cooling blower.
2. the smoke eliminator of PM2.5-PM10 is trapped using magnetic porous medium in traveling magnetic field as claimed in claim 1
The method for carrying out gas cleaning, it is characterised in that follow the steps below：
Multiple-channel output current stabilization DC source is opened, and magnetic porous medium is added in the magnetic porous feed pipe inlet of flue,
Flue gas after electrostatic precipitation or bag-type dusting is introduced into flue, the output of multiple-channel output current stabilization DC source is adjusted
Electric current and conduction time, traveling magnetic field or the pulsed magnetic field along flue direction is obtained, magnetic field has horizontal and vertical magnetic
Field gradient, magnetic porous medium are moved simultaneously with the PM 2.5-PM10 granules in flue gas, and inertial collision, concrete dynamic modulus retention occur
With Blang's diffusive interception, the PM 2.5-PM10 granules in magnetic porous medium dynamic trapping flue gas, through having magnetic field and without magnetic
Field section is intercepted through filter screen when eventually arriving at flue end, realizes separating clean gas, will trap PM 2.5-PM10 granules
Rear magnetic porous medium ultrasonic wave water washing, pickling, again washing, be dried after, obtain the magnetic porous medium being desorbed, fill again
Enter in flue, realize recycling.
3. the gas cleaning of magnetic porous medium trapping PM2.5-PM10 in a kind of traveling magnetic field according to claim 2
Method, it is characterised in that described magnetic porous medium is the porous iron of nickel porous or Jing electrochemical treatments, its particle size diameter ＜
1mm, described drainage screen aperture are less than the diameter of magnetic porous medium.
4. the gas cleaning of magnetic porous medium trapping PM2.5-PM10 in a kind of traveling magnetic field according to claim 2
Method, it is characterised in that the range of accommodation of described electrical current is 5A ~ 30A, described conduction time is 1s ~ 3600s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511020808.7A CN105562204B (en) | 2015-12-30 | 2015-12-30 | Flue gas purification device and method for trapping PM2.5-PM10 in advancing magnetic field by means of magnetic porous media |
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| CN201511020808.7A CN105562204B (en) | 2015-12-30 | 2015-12-30 | Flue gas purification device and method for trapping PM2.5-PM10 in advancing magnetic field by means of magnetic porous media |
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| CN105562204B true CN105562204B (en) | 2017-04-12 |
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| CN108816513B (en) * | 2018-05-30 | 2020-06-23 | 上海电力学院 | Multistage alternating catching type magnetic dust collecting system |
| CN108660281A (en) * | 2018-07-12 | 2018-10-16 | 北京京诚科林环保科技有限公司 | Fire species trapping device |
| CN113137687B (en) * | 2021-04-29 | 2022-06-03 | 东北大学 | Magnetic control porous medium dynamic air purification device and method in fresh air system |
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| JPS6261655A (en) * | 1985-09-11 | 1987-03-18 | Hitachi Ltd | Method and apparatus for separating gas |
| US6210572B1 (en) * | 1999-10-18 | 2001-04-03 | Technology Commercialization Corp. | Filter and method for purifying liquids containing magnetic particles |
| DE102006030835B3 (en) * | 2006-07-04 | 2007-10-18 | Forschungszentrum Karlsruhe Gmbh | Fixed bed used in biotechnology comprises magnetic particles and a magnetizable fabric partially arranged in the fixed bed and having a mesh size which corresponds to the particle size region of each magnetizable particle in the fixed bed |
| CN102416359A (en) * | 2011-09-03 | 2012-04-18 | 盐城市劲风节能环保设备有限公司 | Equipment for removing dust by using magnetic fluid and application thereof as well as method for removing dust in air by using equipment |
| CN102824957A (en) * | 2012-08-30 | 2012-12-19 | 陕西师范大学 | High-gradient magnetic separation flue gas dust removing and collecting device |
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| CN105562204A (en) | 2016-05-11 |
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