CN101391171A - Low-temperature plasma purifier - Google Patents
Low-temperature plasma purifier Download PDFInfo
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- CN101391171A CN101391171A CNA2008102015792A CN200810201579A CN101391171A CN 101391171 A CN101391171 A CN 101391171A CN A2008102015792 A CNA2008102015792 A CN A2008102015792A CN 200810201579 A CN200810201579 A CN 200810201579A CN 101391171 A CN101391171 A CN 101391171A
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- stainless steel
- quartz ampoule
- outer quartz
- electrode probe
- quartz tube
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Links
- 239000010453 quartz Substances 0.000 claims abstract description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 57
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 44
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052802 copper Inorganic materials 0.000 claims abstract description 34
- 239000010949 copper Substances 0.000 claims abstract description 34
- 239000000523 sample Substances 0.000 claims abstract description 26
- 239000010935 stainless steel Substances 0.000 claims abstract description 22
- 239000003054 catalyst Substances 0.000 claims abstract description 21
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 19
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 19
- -1 polytetrafluoroethylene copper Polymers 0.000 claims abstract description 11
- 239000003708 ampul Substances 0.000 claims description 47
- 206010041662 Splinter Diseases 0.000 claims description 7
- 239000012634 fragment Substances 0.000 claims description 7
- 238000006555 catalytic reaction Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract 3
- 239000007789 gas Substances 0.000 description 17
- 230000000505 pernicious effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005495 cold plasma Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Plasma Technology (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to a low temperature plasma purifier. The purifier comprises an outer quartz tube, a stainless steel annular steel wire is wound on the outer wall of the outer quartz tube, both ends of the outer quartz tube are respectively provided with a punch hole in which an insulated sealing plug with a center hole is plugged, and a negative electrode probe and a positive electrode probe are respectively inserted into the center holes of the two insulated sealing plugs. A copper tube with one end equipped with a copper elastic sheet is positioned in the outer quartz tube, an inner quartz tube is also positioned in the copper tube, and the copper tube is supported by two polytetrafluoroethylene copper tube support rings positioned in the outer quartz tube. A stainless steel wire with one end provided with a stainless steel elastic sheet is positioned in the quartz tube, and the stainless steel wire is supported by two polytetrafluoroethylene stainless steel wire support rings positioned in the outer quartz tube. The sealing plug with an air inlet is plugged into one end of the outer quartz tube, and the other end of the outer quartz tube is connected with a detachable catalyst sleeve. The positive electrode probe and the negative electrode probe are electrically connected with a high-voltage pulse power supply, and one end of the stainless steel annular steel wire is connected with the negative electrode probe. The purifier works under normal temperature and pressure and has no noise, and can realize infinite electric discharge in theory, and the device has advantages of long service life and convenient operation; the range of the low temperature plasma of the device is adjustable, and the catalytic domain can be demounted conveniently for facilitating flexible catalyst replacement.
Description
Technical field
The present invention relates to a kind of device that pernicious gases such as vehicle exhaust are purified, particularly at normal temperatures and pressures, can obtain low temperature plasma, it comprises low-temperature plasma generating means and metal carrier catalyst two parts, low temperature plasma elder generation that produces and discarded physics and the chemical reaction of taking place, pass through catalytic domain again, harmful components in the pernicious gas are removed, import in this clarifier as vehicle exhaust and just can remove NO efficiently, CO, harmful components such as CH, the catalyst that tradition is single purifies more advantage.
Background technology
Since U.S. Ford invention automobile production assembling line in 1913, auto manufacturing just is a dark horse.Data shows that to the year ends 2000, whole world car owning amount surpasses 600,000,000, and 116/thousand people increase progressively with 3,000 ten thousand/year; People are when enjoying many benefits of automobile, and the like the shadow following the person and rapid expansion of the healthy killer who can't get rid of---that is exactly a vehicle exhaust.
The method of conventional process vehicle exhaust is that catalyst purifies, but along with the more and more strictness that both at home and abroad motor vehicle emission is required, the cost that the while catalyst is used is also increasing, and particularly now effective catalyst will be used rare precious metals, and not only the easy poisoning of higher while of cost loses activity.
The purification method that appears as of non-thermal plasma trap (NTP) has indicated a new approach.From the eighties of last century the eighties, external a lot of researchers with regard to beginning to utilize the cold plasma discharge technology and carrying out each side and research.The mechanism of plasma chemical method purifying automobile tail gas is, under normal pressure, produce low temperature plasma, utilize a large amount of high energy electrons, excited state particle, elemental oxygen (O) and the extremely strong free radical (OH of consequent oxidisability that contain in the plasma by corona or dielectric barrier discharge
*, HO
2 *), ozone (O
3) etc., cause series of physical and chemical reaction, thereby realize purifying the purpose of nuisance.
Summary of the invention
The objective of the invention is to limitation at present catalyst purifying harmful gas, a kind of new low temperature plasma clarifier is provided, this clarifier is with non-thermal plasma trap and the ripe effective combination of catalyst technology, improved clean-up effect widely, reduced the difficulty that in the past purified, long service life.
For reaching above-mentioned purpose, design of the present invention is:
Limitation based on traditional catalyst purifying harmful gas, develop a kind of new purifier, the high-voltage pulse that high-voltage pulse power source is produced is loaded on the both positive and negative polarity of the low temperature plasma generating means in the clarifier, under as the stopping of the quartz ampoule of medium, produce dielectric barrier discharge, thereby in the cavity of low temperature plasma generating means, produce low temperature plasma, this cavity is divided into inner chamber and exocoel again, the low-temperature plasma of inner chamber by interior quartz ampoule as block media, by center stainless steel wire and copper pipe as electrode; Exocoel by outer quartz ampoule as block media, by copper pipe and peripheral stainless ring like steel wire as electrode.Can change discharge range by the length that changes the peripheral annular stainless steel wire.Pernicious gas is introduced into the low-temperature plasma tagma through inlet, is passed through the catalytic domain of clarifier then again by the gas after the Low Temperature Plasma Treating, is discharged by outlet at last.This clarifier is worked at normal temperatures and pressures, noiselessness, and can realize unlimited discharge in theory, and the long service life of this device, easy to operate; The scope in the low-temperature plasma district of this device is adjustable, and catalytic domain can for convenience detachly be convenient to flexible catalyst replacement; In addition, the cost that this device produces low temperature plasma is low, and clean-up effect is good, has reduced the purification cost simultaneously, can handle pernicious gas of different nature, and is applied widely.
According to the foregoing invention design, the present invention adopts following technical proposals:
A kind of low-temperature plasma purifier, comprise an outer quartz ampoule, it is characterized in that having a stainless steel annular to be wrapped on the described outer quartz ampoule outer wall, respectively there is a perforation at described outer quartz ampoule both ends, respectively be plugged with an insulated enclosure plug that centre bore is arranged in described two perforation, be inserted with negative electrode probe and positive electrode probe in the centre bore of described two insulated enclosure plugs respectively.Place the copper pipe that has copper splinter on one the one end outer wall in the above-mentioned outer quartz ampoule, end in contact in described copper splinter and the described positive electrode probe; Interior quartz ampoule of suit in the described copper pipe, described copper pipe is supported by two polytetrafluoroethylene (PTFE) copper pipe support rings that are placed on outer quartz ampoule inside.The inner stainless steel wire that one one end has the stainless steel shell fragment, the end in contact in described stainless steel shell fragment and the described negative electrode probe of placing of quartz ampoule in described; Described stainless steel wire is supported by two polytetrafluoroethylene (PTFE) stainless steel wire support rings that are placed on outer quartz ampoule inside.Described outer quartz ampoule one end plug has the sealing-plug of bringing gas port into, and the other end is connected with dismounting catalyst sleeve.Described positive and negative electrode probe is electrically connected high-voltage pulse power source, and a section of described stainless steel annular links to each other with the negative electrode probe, and the other end is unsettled, and its effective length can change as required.
The outer end of above-mentioned detachable catalyst sleeve is the gas outlet, can place catalyst at random in the described detachable catalysis sleeve.Described outer quartz ampoule be placed on the base after detachable catalysis sleeve is connected.
The present invention has following conspicuous outstanding substantive point and remarkable advantage compared with prior art:
At first, the present invention has increased discharge range effectively owing to adopt interior exocoel discharge generation low temperature plasma simultaneously, can produce more low temperature plasma, make discharge electric field more even relatively simultaneously, this all helps the low temperature plasma purifying harmful gas.Secondly, because the negative pole of outer cavity discharging is a stainless steel annular, can changes its effective length, thereby realize the control of external cavity discharging scope.Once more, this clarifier not only comprises the low-temperature plasma processing section, also comprise the metallic carrier catalysed partial, composition after the Low Temperature Plasma Treating is further purified again, what adopt is secondary purification, guarantees that purification effects is better, so simultaneously, this catalysed partial is dismountable, can be at different processing gas catalyst changeout more targetedly.At last, this clarifier is worked at normal temperatures and pressures, noiselessness, and can realize unlimited discharge in theory, and the long service life of this device, easy to operate; The cost that this device produces low temperature plasma is low, and clean-up effect is good, has reduced the purification cost simultaneously, can handle pernicious gas of different nature, and is applied widely.
Description of drawings
Fig. 1 is the cross-sectional view of one embodiment of the invention.
Fig. 2 is the internal structure schematic diagram that one embodiment of the invention is removed the air inlet sealing-plug.
The specific embodiment
Reaching embodiment in conjunction with the accompanying drawings is described as follows the present invention:
Referring to Fig. 1, Fig. 2, this low-temperature plasma purifier comprises an outer quartz ampoule 9 and a stainless steel annular 5, its stainless steel annular 5 is wrapped on outer quartz ampoule 9 outer walls, it is the hole of 10mm that respectively there is a diameter at outer quartz ampoule 9 two ends, respectively be plugged with an insulated enclosure plug 3 that centre bore is arranged in two holes, 7, be inserted with negative electrode probe 4 and positive electrode probe 6 in the centre bore of insulated enclosure plug 3,7 respectively.Place the copper pipe 15 that one one end has copper splinter 8 in the outer quartz ampoule 9, interior quartz ampoule 14 of suit in the copper pipe 15, copper pipe 15 is supported by two polytetrafluoroethylene (PTFE) copper pipe support rings 16 that are placed on big quartz ampoule 9 inside.One one end of little quartz ampoule 14 inner placements has the stainless steel wire 13 of stainless steel shell fragment 18, and stainless steel wire 13 is supported by two polytetrafluoroethylene (PTFE) stainless steel wire support rings 17 that are placed on outer quartz ampoule inside.Outer quartz ampoule 9 one end plugs have air inlet sealing-plug 2, and the other end is connected with detachable catalyst sleeve 11.
Be described in further detail below:
Referring to Fig. 1, outer quartz ampoule 9 external diameters are 64mm, wall thickness 2mm, long 250mm, the stainless steel annular 5 that it is 2mm that this outer quartz ampoule 9 is around with a diameter, it is the hole of 10mm that respectively there is a diameter at these outer quartz ampoule 9 two ends, the stopple of left end has the insulated enclosure plug 3 of band centre bore, the stopple of right-hand member has the sealing-plug 7 of band centre bore, be inserted with negative electrode probe 4 in the centre bore of the insulated enclosure plug 3 of band centre bore, stainless steel annular 5 links to each other with negative electrode probe 4, is inserted with positive electrode probe 6 in the centre bore of the insulated enclosure plug 7 of band centre bore.Place an external diameter in the outer quartz ampoule 9 and be 32mm, wall thickness and be 1mm, length and be 180mm, an end has the copper pipe 15 of copper splinter 8, positive electrode probe 6 is inserted in can move up and down in insulated enclosure plug 7 centre bores of being with centre bore and guarantees to contact well with copper splinter 8, and this connection has guaranteed that copper pipe 15 links to each other with positive electrode probe 6.Placing an external diameter in the copper pipe 15 again is that 30mm, wall thickness are that 1mm, length are the interior quartz ampoule 14 of 200mm, copper pipe 15 is supported by two polytetrafluoroethylene (PTFE) copper pipe support rings 16 that are placed on outer quartz ampoule 9 inside, thereby guarantees that copper pipe 15 is in the centre position of outer quartz ampoule.Diameter of interior quartz ampoule 14 inner placements is 2mm, the long stainless steel wire 13 that has stainless steel shell fragment 18 for 230mm, an end, negative electrode probe 4 is inserted in can move up and down in the centre bore of insulated enclosure plug 3 of band centre bore and guarantees to contact well with stainless steel shell fragment 18, and this connection has guaranteed that stainless steel wire 13 links to each other with negative electrode probe 4.Stainless steel wire 13 is supported by two polytetrafluoroethylene (PTFE) stainless steel wire support rings 17 that are placed on outer quartz ampoule 9 inside.This polytetrafluoroethylene (PTFE) stainless steel wire support ring 17 guarantees that stainless steel wire 13 is in the centre position of interior quartz ampoule 14.According to above-mentioned, stainless steel annular 5 all links to each other with the discharge negative pole with stainless steel wire 13, copper pipe 15 links to each other with discharge is anodal, when this clarifier inserts high-voltage pulse power source, because outer quartz ampoule 9, interior quartz ampoule 14 are as block media, dielectric barrier discharge is carried out in zone between positive and negative electrode, produce low temperature plasma.Because the effective length of stainless steel annular 5 as the discharge negative pole is adjustable, thereby can change the scope in cold plasma discharge district.When harmful gas when air inlet 1 enters this district and low temperature plasma generation chemistry and physical reactions, the gas after Low Temperature Plasma Treating enters into catalyst 10 districts, is discharged by gas outlet 11 at last.Detachable catalyst sleeve 11 is to removably connect with outer quartz ampoule 9, and catalyst 10 can get flexibly and change targetedly as required.
Referring to Fig. 2, stainless steel annular 5 is as the discharge negative pole, and copper pipe 15 is anodal as discharge, outer quartz ampoule 9 is as block media, as seen formed a ring discharge zone between its three, this zone is called the exocoel region of discharge, the electric field of discharge generation is even relatively.Stainless steel wire 13 is as the discharge negative poles, and copper pipe 15 is anodal as discharge, and interior quartz ampoule 9 has formed a circular discharge zone as block media between its three, this zone is called the inner chamber region of discharge, and the electric field of this regional discharge generation is also even relatively.With the region of discharge refinement, can produce electric field relatively uniformly by this inside and outside two chambeies, this will help the generation of low temperature plasma and help the Low Temperature Plasma Treating pernicious gas.
Claims (2)
1. low-temperature plasma purifier, comprise an outer quartz ampoule (9), it is characterized in that having a stainless steel annular (5) to be wrapped on described outer quartz ampoule (9) outer wall, respectively there is a perforation at described outer quartz ampoule (9) both ends, respectively be plugged with an insulated enclosure plug (3 that centre bore is arranged in described two perforation, 7), described two insulated enclosure plugs (3,7) be inserted with negative electrode probe (4) and positive electrode probe (6) in the centre bore respectively, place the copper pipe (15) that has copper splinter (8) on one the one end outer wall in the described outer quartz ampoule (9), described copper splinter (8) and the interior end in contact of described positive electrode probe (6); Described copper pipe (a 15) interior quartz ampoule of interior suit (14), described copper pipe (15) is placed on the inner polytetrafluoroethylene (PTFE) copper pipe support ring (16) of outer quartz ampoule (9) by two and supports; The inner stainless steel wire (13) that one one end has stainless steel shell fragment (18), the described stainless steel shell fragment (18) and the interior end in contact of described negative electrode probe (4) placed of quartz ampoule (14) in described; Described stainless steel wire (13) is placed on the inner polytetrafluoroethylene (PTFE) stainless steel wire support ring (17) of outer quartz ampoule (9) by two and supports; Described outer quartz ampoule (9) one end plugs have the sealing-plug (2) of bringing gas port (1) into, and the other end is connected with detachable catalyst sleeve (11); Described positive and negative electrode probe (6,4) is electrically connected high-voltage pulse power source; One section of described stainless steel annular (5) links to each other with negative electrode probe (4), and the other end is unsettled, and its effective length can change as required.
2. low-temperature plasma purifier according to claim 1, the outer end that it is characterized in that above-mentioned detachable catalysis sleeve (11) are gas outlet (12), place catalyst (10) at random in the described detachable catalysis sleeve (11); Described outer quartz ampoule (9) be placed on the base (19) after detachable catalysis sleeve (11) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102015792A CN101391171B (en) | 2008-10-23 | 2008-10-23 | Low-temperature plasma purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102015792A CN101391171B (en) | 2008-10-23 | 2008-10-23 | Low-temperature plasma purifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101391171A true CN101391171A (en) | 2009-03-25 |
| CN101391171B CN101391171B (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102015792A Expired - Fee Related CN101391171B (en) | 2008-10-23 | 2008-10-23 | Low-temperature plasma purifier |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252357A (en) * | 2011-06-23 | 2011-11-23 | 凯天环保科技股份有限公司 | Kitchen oil mist and lampblack purifier |
| CN102358146A (en) * | 2011-08-25 | 2012-02-22 | 新乡市豫新商用车空调股份有限公司 | Air purification device for vehicle |
| CN102755819A (en) * | 2012-08-02 | 2012-10-31 | 桂林市世环废气处理设备有限公司 | Low-temperature plasma oxidizer and low-temperature plasma deodorization system |
| CN105498529A (en) * | 2016-01-22 | 2016-04-20 | 中科新天地（合肥）环保科技有限公司 | Low-temperature plasma concerted catalysis discharging device for adsorbing and treating organic waste gas |
| CN105688585A (en) * | 2016-04-13 | 2016-06-22 | 中国石油大学(北京) | Integrated smoke dedusting and demercurating device and treatment method thereof for composite filmed filter bag of plasma reactor |
| CN106225086A (en) * | 2016-09-13 | 2016-12-14 | 西安交通大学 | A kind of indoor fresh air register |
| CN113786716A (en) * | 2021-09-22 | 2021-12-14 | 苏州杰宸环境科技有限公司 | Three-dimensional high-density low-temperature plasma generating device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2312518Y (en) * | 1997-11-28 | 1999-03-31 | 复旦大学 | Low temp. plasma discharging tube |
| US6187080B1 (en) * | 1999-08-09 | 2001-02-13 | United Microelectronics Inc. | Exhaust gas treatment apparatus including a water vortex means and a discharge pipe |
| CN100540121C (en) * | 2006-06-22 | 2009-09-16 | 复旦大学 | A kind of method and apparatus for the treatment of industrial waste gas through dual plasma |
| CN101234211A (en) * | 2007-12-27 | 2008-08-06 | 上海市政工程设计研究总院 | Device and method for processing municipal utilities foul gas |
-
2008
- 2008-10-23 CN CN2008102015792A patent/CN101391171B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252357A (en) * | 2011-06-23 | 2011-11-23 | 凯天环保科技股份有限公司 | Kitchen oil mist and lampblack purifier |
| CN102358146A (en) * | 2011-08-25 | 2012-02-22 | 新乡市豫新商用车空调股份有限公司 | Air purification device for vehicle |
| CN102755819A (en) * | 2012-08-02 | 2012-10-31 | 桂林市世环废气处理设备有限公司 | Low-temperature plasma oxidizer and low-temperature plasma deodorization system |
| CN102755819B (en) * | 2012-08-02 | 2014-04-16 | 桂林市世环废气处理设备有限公司 | Low-temperature plasma oxidizer and low-temperature plasma deodorization system |
| CN105498529A (en) * | 2016-01-22 | 2016-04-20 | 中科新天地（合肥）环保科技有限公司 | Low-temperature plasma concerted catalysis discharging device for adsorbing and treating organic waste gas |
| CN105688585A (en) * | 2016-04-13 | 2016-06-22 | 中国石油大学(北京) | Integrated smoke dedusting and demercurating device and treatment method thereof for composite filmed filter bag of plasma reactor |
| CN105688585B (en) * | 2016-04-13 | 2018-02-23 | 中国石油大学(北京) | A kind of the integrated fume dedusting mercury removal device and its processing method of plasma reactor joint membrane bag filter |
| CN106225086A (en) * | 2016-09-13 | 2016-12-14 | 西安交通大学 | A kind of indoor fresh air register |
| CN106225086B (en) * | 2016-09-13 | 2019-04-12 | 西安交通大学 | A kind of indoor fresh air register |
| CN113786716A (en) * | 2021-09-22 | 2021-12-14 | 苏州杰宸环境科技有限公司 | Three-dimensional high-density low-temperature plasma generating device |
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| Publication number | Publication date |
|---|---|
| CN101391171B (en) | 2011-05-04 |
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