CN201944844U - Low nitrogen oxide burning device - Google Patents
Low nitrogen oxide burning device Download PDFInfo
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- CN201944844U CN201944844U CN2010205796908U CN201020579690U CN201944844U CN 201944844 U CN201944844 U CN 201944844U CN 2010205796908 U CN2010205796908 U CN 2010205796908U CN 201020579690 U CN201020579690 U CN 201020579690U CN 201944844 U CN201944844 U CN 201944844U
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- inlet pipe
- blade
- oxygen
- flame holder
- fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model relates to a low nitrogen oxide burning device, mainly comprising a fuel inlet pipe, a lean oxygen inlet pipe, a radial swirl vane, a pre-mixing chamber, a flame holder, a rich oxygen inlet pipe and a tangential swirl vane, wherein the fuel inlet pipe as a center sleeve is arranged at the axle core position, the start end of the fuel inlet pipe is connected with a fuel pipeline and the tail end is connected with the pre-mixing chamber; the lean oxygen inlet pipe is arranged at the outer side of the fuel inlet pipe, the radial swirl vane arranged around the pre-mixing chamber, the flame holder is arranged in the center position of the top outlet of the pre-mixing chamber, the rich oxygen inlet pipe is tangentially connected with the sleeve at the outer side of the burning device, the radial swirl vane is connected with the inner wall of the sleeve at the outer side; the number of the radial swirl vane is 8. Using the pre-mixing and burning process of the lean oxygen prepared by an air separation device, a reducibility main burning area is formed on the downstream of the flame holder to effectively prevent the temperature type NOx from generating; and then the rich oxygen is sent in the whirl way from the outer side of the main burning area and the after-burning process of the residual fuel and the thermal decomposition product effectively reduces the amount of the soot and CO in the burning product. The low nitrogen oxide burning device has features of high burning efficiency, low pollutant discharge, stable flame and uniform flame temperature field and is suitable for the power devices, such as a ground gas turbine, a fuel gas-fired boiler and a heating boiler.
Description
Technical field
The utility model relates to a kind of low nitrogen oxide burning device, is a kind of oxygen deprivation (13%≤O that utilizes specifically
2≤ 21%) tissue part's premixed combustion utilizes oxygen enrichment (21%≤O
2≤ 30%) finishes the burner of the cleaning, efficient burning technology (oxygen deprivation partly-premixed-oxygen enrichment afterburning technology) of after-flame process.
Background technology
The traditional combustion technology adopts diffusion combustion more, utilize the mixed combustion process between rotating jet or cross jet realization fuel and air, oxygen enrichment even the pure oxygen, although this method has improved efficiency of combustion, but will form the local reaction high-temperature region at jet compound boundary layer region, and cause nitrogen oxide (NOx) growing amount to increase substantially.Formation mechanism based on diffusion combustion process NOx, the various countries scholar has proposed air classification burning, bias combustion, flue gas recirculation, rich combustion/sudden in succession cold/low NOx combusting technologies such as poor combustion, by reducing primary zone temperature or oxygen concentration, shortening oxygen in the residence time of high-temperature region, with measures such as the reduction of the NOx in the flue gas, reach the purpose that reduces diffusion combustion process NOx growing amount.But reducing between pollutant emission and the overheavy firing is a pair of contradictory relation all the time, and above-mentioned low NOx combusting technology all might mix bad soot and the CO growing amount of causing because of fuel/oxygen and improve in implementation process.
For diffusion combustion, the premixed combustion process is not subjected to the restriction of factors such as diffusion of components, and its efficiency of combustion is higher, not only is beneficial to and dwindles combustion chamber volume, and can control flame temperature and NOx growing amount by fuel or oxygen concentration in the control premix gas.Based on above-mentioned theory development and lean fuel premixed combustion technology (Lean premixed combustion) of coming and poor combustion premix and pre-evaporation combustion technology (Lean premixed prevaporized combustion) are the most potential low NOx combusting technologies at present.Its basic principle is that fuel and air are pre-mixed under lower stoichiometric ratio, and organizes the swirl flow combustion process; Because of its flame temperature relatively low, so the NOx growing amount is less, simultaneously since oxygen abundance and fuel/oxygen mix, so the growing amount of soot and CO also is far smaller than diffusion flame.Therefore, lean fuel premixed combustion can realize cleaning more, combustion process efficiently.But also exactly because the too close poor combustion flame failure limit of the condition of work of poor combustion premixed swirl flame, and bigger swirl strength and turbulence intensity are easy to bring out and occur unsettled vortex precession (Processing Vortex Core) in the sheared edge interlayer, be easy to cause local quenching takes place in the flame front, cause flame heat to discharge the generating period pulsation; In some cases, the flame of pulsation heat discharges and can excited oscillation take place with the acoustic pressure vibration in the combustion chamber, forms hot acoustical coupling vibration, causes premixed flame generation dynamics unstability the most at last even extinguishes.
By experiment and theoretical research to poor combustion premixed swirl combustion process NOx emission performance and kinetics of flame stability, the patent applicant finds, utilize the porous media retention flame, adopt partly-premixed/measures such as circulation gas injection can effectively reduce the amplitude of the hot acoustical coupling vibration of premixed combustion process, and NOx, soot and CO output can be controlled in the lower scope.Based on above-mentioned experiment and theoretical analysis result, the spy has proposed a kind of oxygen deprivation (13%≤O that utilizes
2≤ 21%) tissue part's premixed combustion, utilizes oxygen enrichment (21%≤O
2≤ 30%) the low NOx efficient burning technology of tissue after-flame process has designed the burner based on this technology simultaneously.
Summary of the invention
The purpose of this utility model provides a kind of low nitrogen oxide burning device, it be effectively reduce NOx in the hydrocarbon fuel combustion process, soot and CO growing amount " oxygen deprivation partly-premixed-oxygen enrichment afterburning " burning process technology and be the burner of theoretical foundation.The utility model combines the advantage of air classification burning, bias combustion, lean fuel premixed combustion and oxygen-enriched combustion technology on the one hand, overcome above-mentioned each technology technological deficiency separately on the other hand, have that pollutant emission is low, efficiency of combustion is high, flame holding reaches characteristics such as flame temperature field is even well, be widely used.
The step that a kind of low-nitrogen oxide combustion technique that the utility model provides comprises: utilize oxygen deprivation and hydrocarbon fuel tissue part premixed combustion process, to suppress the generation of NOx, utilize oxygen enrichment to organize the afterburning process simultaneously, to reduce the growing amount of soot and CO in the outside, primary zone; The overall stoichiometric ratio of whole combustion process is controlled at below 1.0.
The step that a kind of low-nitrogen oxide combustion technique that the utility model provides comprises:
Utilize oxygen concentration to be the oxygen deprivation of 13%-21% and hydrocarbon fuel histochemistry equivalent proportion partly-premixed combustion process for 1.1-1.3, to suppress the generation of temperature mode NOx, utilize oxygen concentration to organize the afterburning process in the outside, primary zone simultaneously, to reduce the growing amount of soot and CO for the oxygen enrichment of 21%-30%; The overall stoichiometric ratio of whole combustion process is controlled at below 1.0.
Utilize the oxygen deprivation (slowly gas) of generation oxygen concentration such as film oxygen enriching equipment between 13%-21% realize with hydrocarbon fuel histochemistry equivalent proportion be the partly-premixed combustion process of 1.1-1.3.
The described oxygen enrichment of oxygen concentration between 21%-30% that utilizes generations such as film oxygen enriching equipment realizes that overall equivalent proportion is less than 1.0 afterburning process.
Described partly-premixed combustion process is to utilize radial vortex and direct projection stream to organize the partly-premixed process of oxygen deprivation and hydrocarbon fuel in the premixer of burner.
Described partly-premixed combustion process is to utilize eddy flow flame holder or porous media flame holder to realize the stable of partly-premixed flame, forms the primary zone of reducing atmosphere.
Described afterburning process is to utilize the oxygen enrichment of tangential swirl tissue oxygen concentration 21%-30% and the after-flame process of uncombusted fuel and thermal decomposition product, and controls overall stoichiometric ratio below 1.0.
A kind of low nitrogen oxide burning device that the utility model provides mainly comprises: fuel inlet pipe, oxygen deprivation inlet tube, radial vortex blade, premixer, flame holder, oxygen enrichment inlet tube and tangential swirl blade.
Burner is columniform three layers of tube-in-tube structure.The fuel inlet pipe is positioned at shaft core position as cylindrical central sleeve, and its top links to each other with fuel channel, and its end links to each other with the premixer.The oxygen deprivation inlet tube is positioned at the fuel inlet pipe outside, and radial vortex blade (optional a group 8) arranges that around the premixer tangential swirl blade is connected with outside sleeve lining face; After the oxygen deprivation that air separation equipment produces enters intermediate sleeve via the oxygen deprivation inlet tube, enter in the premixer in the rotating jet mode through the radial vortex blade then, form partly-premixed combustible gas with fuel.Tangential swirl flame holder (or porous media flame holder) is positioned at top exit center, premixer, and part is flammable, and premix gas enters the combustion chamber via tangential swirl flame holder (or porous media flame holder), forms the primary zone of reducing atmosphere.The oxygen enrichment inlet tube tangentially is connected with burner outside sleeve, the oxygen enrichment of air separation equipment preparation enters outside sleeve via the oxygen enrichment inlet tube, the tangential swirl blade that the outside sleeve of flowing through then exports, enter the combustion chamber in the rotating jet mode, form the afterburning district of oxidizing atmosphere in the outside, primary zone.
Burner integral body is cylindrical, and fuel inlet pipe, oxygen deprivation inlet tube, oxygen enrichment inlet tube are pipe; The premixer is cylindric chamber; The radial vortex blade is one group of prismatic blade, with premixer's end cap welding up and down; Tangential swirl blade 7 is one group of prismatic blade, welds with outside sleeve lining face; Tangential swirl flame holder (or porous media flame holder) 5 is by one group of twisted blade, and (the porous media flame holder is the porous ceramic bodies that is fastened in the pipe) welded at the inside and outside two ends of blade respectively with centered cylinder and outside round tube inner wall face.
Characteristics of the present utility model are described in detail as follows:
Related " oxygen enrichment " of the utility model is meant and utilizes oxygen concentration that air separation technology (as the film oxygen enriching technology of preparing) the prepares oxygen/nitrogen mist between 21%-30%, " oxygen deprivation " is meant that then the oxygen concentration that produced after the air separation between the gas slowly of 13%-21% (generally, slowly how the gas of this concentration directly enters atmosphere, and is not used).The concentration of above-mentioned " oxygen enrichment ", " oxygen deprivation " can prepare apparatus operating parameters by the adjustment oxygen enrichment and be guaranteed.
Related " oxygen deprivation partly-premixed-oxygen enrichment afterburning technology " of the utility model is meant " oxygen deprivation " and carbon-hydrogen fuel carried out premixed combustion by a certain stoichiometric ratio Φ (1.1≤Φ≤1.3), forms the primary zone of reducing atmosphere; Simultaneously,, utilize the rotating jet mode to send into " oxygen enrichment ", form the afterburning district of oxidizing atmosphere in the outside, primary zone; In the whole combustion process of hydrocarbon fuel, keep overall stoichiometric ratio Φ less than 1.0.Adopt " oxygen deprivation is partly-premixed " can make the primary zone flame temperature reduce 150-200 ℃, thereby effectively suppress the generation of temperature mode NOx; Simultaneously, the reducing atmosphere in the primary zone also helps NOx is reduced into N
2Adopt " oxygen enrichment afterburning " to help to improve the burning velocity and the after-flame degree of the outside, primary zone residue hydrocarbon fuel and thermal decomposition product thereof, can effectively reduce the volume content of soot and CO in the combustion product.Result of study shows, under identical operating mode, for lean fuel premixed combustion, adopts " oxygen deprivation partly-premixed-oxygen enrichment afterburning " technology can reduce that NOx concentration is more than 75% in the flue gas, and the growing amount of soot and CO is suitable, and flame holding improves greatly.
The utility model can be used for power-equipments such as ground gas turbine, oil-burning gas-fired boiler and fuel-firing gas-firing heating furnace.
The utility model combines the advantage of air classification burning, bias combustion, lean fuel premixed combustion and oxygen-enriched combustion technology on the one hand, overcome above-mentioned each technology technological deficiency separately on the other hand, have that pollutant emission is low, efficiency of combustion is high, flame holding reaches characteristics such as flame temperature field is even well, the utility model is widely used.
Description of drawings
Fig. 1 a is burner generalized section (an eddy flow flame holder).
Fig. 1 b is burner generalized section (a porous media flame holder).
Fig. 2 is a burner A-A view.
Fig. 3 a is the velocity field schematic diagram under the poor combustion premix condition.
Fig. 3 b be oxygen deprivation partly-premixed-velocity field schematic diagram under the oxygen enrichment afterburning condition.
Fig. 4 a is the temperature field schematic diagram under the poor combustion premix condition.
Fig. 4 b be oxygen deprivation partly-premixed-temperature field schematic diagram under the oxygen enrichment afterburning condition.
Fig. 5 a is a NO concentration field schematic diagram under the poor combustion premix condition.
Fig. 5 b be oxygen deprivation partly-premixed-oxygen enrichment afterburning condition under NO concentration field schematic diagram.
The specific embodiment
The utility model is described in detail as follows with reference to accompanying drawing:
Fig. 1 a, Fig. 1 b are respectively the burner profiles that adopts eddy flow flame holder and porous media flame holder, and Fig. 2 is a burner A-A view.
1 is the hydrocarbon fuel inlet tube among the figure, and 2 are the oxygen deprivation inlet tube, and 3 is the radial vortex blade, and 4 is the premixer, and 5 is eddy flow flame holder or porous media flame holder, and 6 is the oxygen enrichment inlet tube, and 7 is the tangential swirl blade.
The related burner of the utility model is based on above-mentioned technical know-how design, but efficient, the low NOx combustion process of rationalization's hydrocarbon fuel.This burner mainly is made up of fuel inlet pipe 1, oxygen deprivation inlet tube 2, radial vortex blade 3, premixer 4, flame holder 5, oxygen enrichment inlet tube 6 and tangential swirl blade 7.
Burner is cylindrical, three layers of tube-in-tube structure.Fuel inlet pipe 1 is positioned at shaft core position as cylindrical central sleeve, and its top links to each other with fuel channel, and its end links to each other with premixer 4.Oxygen deprivation inlet tube 2 is positioned at fuel inlet pipe 1 outside, radial vortex blade 3 (one group 8) is 4 layouts around the premixer, after the oxygen deprivation that air separation equipment produces enters intermediate sleeve via oxygen deprivation inlet tube 2, enter in the premixer 4 in the rotating jet mode through radial vortex blade 3 then, form partly-premixed combustible gas with fuel.Tangential swirl flame holder (or porous media flame holder) 5 is positioned at 4 top exit centers, premixer, and part is flammable, and premix gas enters the combustion chamber via tangential swirl flame holder (or porous media flame holder) 5, forms the primary zone of reducing atmosphere.Oxygen enrichment inlet tube 6 tangentially is connected with burner outside sleeve, the oxygen enrichment of air separation equipment preparation enters outside sleeve via oxygen enrichment inlet tube 6, the tangential swirl blade 7 that the outside sleeve of flowing through then exports, enter the combustion chamber in the rotating jet mode, form the afterburning district of oxidizing atmosphere in the outside, primary zone.
Burner integral body is cylindrical, and fuel inlet pipe 1, oxygen deprivation inlet tube 2, oxygen enrichment inlet tube 6 are pipe; Premixer 4 is cylindric chamber; Radial vortex blade 3 is one group of prismatic blade, with premixer's end cap welding about in the of 4; Tangential swirl blade 7 is one group of prismatic blade, welds with outside sleeve lining face; Tangential swirl flame holder (or porous media flame holder) 5 is by one group of twisted blade, and (the porous media flame holder is the porous ceramic bodies that is fastened in the pipe) welded at the inside and outside two ends of blade respectively with centered cylinder and outside round tube inner wall face.
Hydrocarbon gas fuel enters premixer 4 through center fuel inlet pipe 1 with the direct current form; Oxygen deprivation enters premixer 4 through oxygen deprivation inlet tube 2 and radial vortex blade 3 with the eddy flow form by a certain stoichiometric ratio φ; Both finish mixed process in premixer 4, form partly-premixed combustible gas; Partly-premixed combustible gas burns by flame holder 5 ejections through eddy flow or porous, forms the primary zone of reducing atmosphere.Oxygen enrichment is sent into from the outside, primary zone in the rotating jet mode through oxygen enrichment inlet tube 6 and tangential swirl blade 7, with the residual fuel and the thermal decomposition product generation combustion reaction of flowing out from the primary zone, forms the afterburning district.
The utility model utilizes film oxygen enriching to prepare equipment, and (film oxygen enriching prepares equipment, energy-conservation Science and Technology Ltd. can be believed in Henan, product type: MZYR-25 to MZYR-300, the oxygen enrichment amount of purchasing 400 sides/hour to 2500 sides/hour) or other air separation equipment prepare the oxygen deprivation that oxygen concentration is oxygen enrichment and the 13%-21% of 21%-30%; Oxygen deprivation and hydrocarbon fuel are carried out even premix with a certain stoichiometric ratio Φ (1.1≤Φ≤1.3) in the premixer, and form the primary zone of reducing atmosphere in eddy flow flame holder and porous media flame holder downstream; Keep overall stoichiometric ratio less than 1.0 situation under, oxygen enrichment is sent into from the outside, primary zone with the rotating jet form, make it and residual fuel and thermal decomposition product mixed combustion, form the afterburning district of oxidizing atmosphere.
Keeping under the identical situation in overall equivalent proportion Φ=0.625, analog study lean fuel premixed combustion and oxygen deprivation partly-premixed-NOx of oxygen-enriched combustion-supporting generates situation, analog parameter is: oxygen deprivation concentration in center is 18%, outside oxygen-rich concentration is 24%.Shown in the analog result figure:
Fig. 3 a is the velocity field schematic diagram under the poor combustion premix condition.Fig. 3 b be oxygen deprivation partly-premixed-velocity field schematic diagram under the oxygen enrichment afterburning condition.Both VELOCITY DISTRIBUTION trend basically identicals, but the latter's center swirl velocity is slightly high, annular jet speed is lower slightly, and average speed is low slightly.
Fig. 4 a is the temperature field schematic diagram under the poor combustion premix condition; Fig. 4 b be oxygen deprivation partly-premixed-temperature field schematic diagram under the oxygen enrichment afterburning condition; Latter's flame high-temperature region temperature obviously reduces, and the temperature field is more even in the combustion chamber.
Fig. 5 a is the NO concentration field schematic diagram under the poor combustion premix condition; Fig. 5 b be oxygen deprivation partly-premixed-NO concentration field schematic diagram under the oxygen enrichment afterburning condition; NO concentration contrasts (mass fraction) result as can be seen, and the latter's NO concentration has reduced more than 75%.
Claims (7)
1. a low nitrogen oxide burning device is characterized in that it mainly comprises: fuel inlet pipe, oxygen deprivation inlet tube, radial vortex blade, premixer, flame holder, oxygen enrichment inlet tube and tangential swirl blade; The fuel inlet pipe is positioned at shaft core position as cylindrical central sleeve, and its top links to each other with fuel channel, and its end links to each other with the premixer; The oxygen deprivation inlet tube is positioned at the fuel inlet pipe outside, the radial vortex blade shroud is arranged around the premixer, flame holder is positioned at top exit center, premixer, and the oxygen enrichment inlet tube tangentially is connected with burner outside sleeve, and the tangential swirl blade is connected with outside sleeve lining face; Burner integral body is cylindrical, three layers of tube-in-tube structure; Described radial vortex blade is 8.
2. burner according to claim 1 is characterized in that described flame holder is tangential swirl flame holder or porous media flame holder.
3. burner according to claim 1 is characterized in that described premixer is cylindric chamber.
4. burner according to claim 1 is characterized in that described radial vortex blade is a prismatic blade, with premixer's end cap welding up and down.
5. burner according to claim 1 is characterized in that described tangential swirl blade is one group of prismatic blade, welds with outside sleeve lining face.
6. burner according to claim 2 is characterized in that described tangential swirl flame holder is one group of twisted blade, and weld with centered cylinder and outside round tube inner wall face respectively at the inside and outside two ends of blade.
7. burner according to claim 2 is characterized in that described porous media flame holder is the porous ceramic bodies that is fastened in the pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205796908U CN201944844U (en) | 2010-10-28 | 2010-10-28 | Low nitrogen oxide burning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205796908U CN201944844U (en) | 2010-10-28 | 2010-10-28 | Low nitrogen oxide burning device |
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| Publication Number | Publication Date |
|---|---|
| CN201944844U true CN201944844U (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205796908U Expired - Fee Related CN201944844U (en) | 2010-10-28 | 2010-10-28 | Low nitrogen oxide burning device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019448A (en) * | 2014-06-13 | 2014-09-03 | 北京北机机电工业有限责任公司 | Double-layer cyclone device of heater combustor |
| CN106594718A (en) * | 2016-12-28 | 2017-04-26 | 浙江宜清环境技术有限公司 | Parallel-flow type oxygen-enriched burner device used for pulverized coal boiler |
| CN111288448A (en) * | 2020-03-20 | 2020-06-16 | 东营富润智能科技有限公司 | Ultralow nitrogen burner for oil field heating furnace |
| CN113701151A (en) * | 2021-09-08 | 2021-11-26 | 上海岱鼎工业设备有限公司 | Gas burner |
| CN114811945A (en) * | 2022-04-29 | 2022-07-29 | 西安交通大学 | Premixing low-nitrogen gas boiler |
-
2010
- 2010-10-28 CN CN2010205796908U patent/CN201944844U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019448A (en) * | 2014-06-13 | 2014-09-03 | 北京北机机电工业有限责任公司 | Double-layer cyclone device of heater combustor |
| CN106594718A (en) * | 2016-12-28 | 2017-04-26 | 浙江宜清环境技术有限公司 | Parallel-flow type oxygen-enriched burner device used for pulverized coal boiler |
| CN111288448A (en) * | 2020-03-20 | 2020-06-16 | 东营富润智能科技有限公司 | Ultralow nitrogen burner for oil field heating furnace |
| CN113701151A (en) * | 2021-09-08 | 2021-11-26 | 上海岱鼎工业设备有限公司 | Gas burner |
| CN114811945A (en) * | 2022-04-29 | 2022-07-29 | 西安交通大学 | Premixing low-nitrogen gas boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20151028 |
|
| EXPY | Termination of patent right or utility model |