CN102363821A - High speed blast furnace gas pressure turbine - Google Patents
High speed blast furnace gas pressure turbine Download PDFInfo
- Publication number
- CN102363821A CN102363821A CN2011103410409A CN201110341040A CN102363821A CN 102363821 A CN102363821 A CN 102363821A CN 2011103410409 A CN2011103410409 A CN 2011103410409A CN 201110341040 A CN201110341040 A CN 201110341040A CN 102363821 A CN102363821 A CN 102363821A
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- China
- Prior art keywords
- high speed
- gas recovery
- top gas
- furnace top
- recovery turbine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 125000002837 carbocyclic group Chemical group 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 62
- 238000011084 recovery Methods 0.000 claims description 52
- 238000007789 sealing Methods 0.000 claims description 30
- 210000004907 gland Anatomy 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 2
- 238000007664 blowing Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NHDHVHZZCFYRSB-UHFFFAOYSA-N pyriproxyfen Chemical compound C=1C=CC=NC=1OC(C)COC(C=C1)=CC=C1OC1=CC=CC=C1 NHDHVHZZCFYRSB-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Abstract
The invention discloses a high speed blast furnace gas pressure turbine. The high speed blast furnace gas pressure turbine comprises: a pedestal; a housing which is connected to the pedestal and comprises an inlet end and an exhaust end; a rotor which comprises a main shaft, a wheel disc and one or two moving blades; a bearing assembly which comprises a first bearing and a second bearing which are arranged on the housing, wherein two end parts of the main shaft are respectively and rotatably arranged in the first bearing and the second bearing; one or two stator blades which are arranged on the inner surface of the housing and are arranged opposite to the one or two moving blades; and an air seal assembly which is arranged between one end of the main shaft close to the wheel disc and the housing and comprises a labyrinth seal member close to the wheel disc and a carbocyclic ring seal member far from the wheel disc. The high speed blast furnace gas pressure turbine of the invention has the advantages of simple equipment structure, high rotating speed and the like, so the high speed blast furnace gas pressure turbine which can be coupled with a blast furnace blower in rotating speed can be directly connected with the blast furnace blower, thereby the energy loss of a gearbox is saved, and the shafting of a whole set is simple and reasonable.
Description
Technical field
The present invention relates to the Power Machinery Engineering technical field, relate in particular to a kind of high speed blast-furnace top gas recovery turbine machine.
Background technology
The blast-furnace top gas recovery turbine machine is the sub product that utilizes blast-furnace smelting; Be pressure ability and the heat energy that top gas has; Do work the device of output mechanical energy through turbine expansion; Be a kind of second energy retrieving arrangement that can play the environmental protection and energy saving effect, can not only recovered energy, the protection environment, can also reduce cost for iron and steel enterprise.
At present; Usually the blast furnace blast energy recovery unit (BPRT) that adopts coal gas turbine that blast-furnace top gas recovery turbine machine and blast furnace blowing engine are designed as same system and motor coaxle to drive, with the pressure of blast furnace gas can and heat energy change direct driving blast furnace blowing engine work after the mechanical energy into.Yet because the structural limitations of existing blast-furnace top gas recovery turbine machine, its working speed is generally 3000 rev/mins (electrical network 50Hz) or 3600 rev/mins (electrical network 60Hz).
For the BPRT unit; Because the working speed that the rotating speed of existing blast-furnace top gas recovery turbine machine is lower than blast furnace blowing engine (for example; 4800 rev/mins); Therefore can't directly link to each other with blast furnace blowing engine, must between existing blast-furnace top gas recovery turbine machine and blast furnace blowing engine, be connected wheel box, rotating speed is promoted to the higher rotation speed that satisfies the blast furnace blowing engine requirement.Can bring following shortcoming for the BPRT unit increases a wheel box: one, BPRT unit unreasonable allocation, system constitute complicacy, the trouble spot is many, the maintenance of the equipment workload is big; Two, axle is that design difficulty is big, and is high to manufacturing, the installation requirement of equipment; Three, can lose mechanical energy through the wheel box transmission, whole BPRT unit efficiency is reduced; Four, the BPRT unit equipment is many, floor space is big, has increased BPRT unit cost.
Therefore, need a kind of high speed blast-furnace top gas recovery turbine machine, to address the above problem.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art, the invention provides a kind of high speed blast-furnace top gas recovery turbine machine, comprising: base; Shell, said shell is connected on the said base, and said shell comprises inlet end and exhaust side; Rotor, said rotor comprise main shaft, are arranged on the wheel disc of said main shaft one end and the rotor blade that is arranged on the excircle of said wheel disc; Bearing assembly, said bearing assembly comprise the clutch shaft bearing and second bearing that is arranged on the said shell, two ends of said main shaft can be rotatably set in respectively in the said clutch shaft bearing with said second bearing in; Stator blades, said stator blades are arranged on the internal surface of said shell and with said rotor blade and relatively are provided with, to match with said rotor blade; Gentle sealing assembly, said sealing gland assembly are arranged between the end and said shell near said wheel disc of said main shaft, and said sealing gland assembly comprises near the labyrinth seal of said wheel disc with away from the carbocyclic ring sealing member of said wheel disc.
Preferably, said carbocyclic ring sealing member is multistage carbocyclic ring sealing member, and between said multistage carbocyclic ring sealing member, fills nitrogen.
Preferably, said main shaft and said wheel disc are for dividing body structure, and said main shaft is connected through pull bar with said wheel disc.
Preferably, said rotor blade is an one-level rotor blade structure, and said stator blades is an one-level stator blades structure.
Preferably, said rotor blade is a secondary rotor blade structure, and said stator blades is a secondary stator blades structure.
Preferably, said rotor blade is fixed on the said wheel disc through vertical tree-like blade root.
Preferably, said high speed blast-furnace top gas recovery turbine machine also comprises the stator blades drive unit, is used to change the angle of said stator blades.
Preferably, the ratio of the diameter of the depth of blade of said stator blades and said rotor blade and said main shaft is smaller or equal to 0.2.
Preferably, the inlet end of said high speed blast-furnace top gas recovery turbine machine adopts axial admission structure, the downward air intake structure in footpath or radially goes up air intake structure.
Preferably, the exhaust side of said high speed blast-furnace top gas recovery turbine machine adopts the footpath exhaust structure or the exhaust structure that directly makes progress downwards.
High speed blast-furnace top gas recovery turbine machine of the present invention is because the cantilever rotor structure that adopts biradial to support, and has therefore that device structure is simple, the rotating speed advantages of higher, and then high speed blast-furnace top gas recovery turbine machine can be complementary with the rotating speed of blast furnace blowing engine.Like this, high speed blast-furnace top gas recovery turbine machine can directly link to each other with blast furnace blowing engine, has not only saved the energy dissipation of wheel box, makes that also the axle of whole unit is the advantages of simple that becomes.In addition, the cantilever rotor structure that adopts biradial to support only needs at low pressure end the sealing gland assembly to be set, and has saved the sealing of high-pressure side, has therefore reduced the probability that accident occurs, guarantees the safety of equipment.Further, because high speed blast-furnace top gas recovery turbine machine can have high rotational speed, the gas flow rate in the leaf grating is higher, therefore can alleviate the dust stratification problem.
In the summary of the invention part, introduced the notion of a series of reduced forms, this will further explain in the embodiment part.Content part of the present invention does not also mean that key feature and the essential features that will attempt to limit technical scheme required for protection, does not more mean that the protection domain of attempting to confirm technical scheme required for protection.
Below in conjunction with accompanying drawing, specify advantage of the present invention and characteristic.
Description of drawings
Attached drawings of the present invention is used to understand the present invention at this as a part of the present invention.Embodiments of the invention and description thereof have been shown in the accompanying drawing, have been used for explaining principle of the present invention.In the accompanying drawings,
Fig. 1 is the sectional view according to the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention;
Fig. 2 is the synoptic diagram according to the rotor of one embodiment of the present invention;
Fig. 3 is the enlarged view according to the sealing gland assembly of one embodiment of the present invention;
Fig. 4 is the sectional view of the high speed blast-furnace top gas recovery turbine machine of another embodiment according to the present invention;
Fig. 5 A is the synoptic diagram according to the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention;
Fig. 5 B is the synoptic diagram according to the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention; And
Fig. 5 C is the synoptic diagram according to the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention.
Embodiment
In the description hereinafter, a large amount of concrete details have been provided so that more thorough understanding of the invention is provided.Yet, it will be apparent to one skilled in the art that the present invention can need not one or more these details and be able to enforcement.In other example,, describe for technical characterictics more well known in the art for fear of obscuring with the present invention.
In order thoroughly to understand the present invention, detailed structure will be proposed in following description.Obviously, execution of the present invention is not limited to the specific details that those skilled in the art has the knack of.Preferred embodiment of the present invention is described in detail as follows, yet except these were described in detail, the present invention can also have other embodiments.
Fig. 1 is that Fig. 2 is the synoptic diagram according to the rotor of one embodiment of the present invention according to the sectional view of the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention, and Fig. 3 is the enlarged view according to the sealing gland assembly of one embodiment of the present invention.Parts identical in Fig. 1-3 use identical Reference numeral.To combine Fig. 1-3 pair of high speed blast-furnace top gas recovery turbine machine according to the present invention to be described in detail below.
As shown in Figure 1, high speed blast-furnace top gas recovery turbine machine 100 comprises base 110, shell 120, rotor 130, bearing assembly, stator blades 150 gentle sealing assemblies 160.
As shown in Figure 2, rotor 130 comprises main shaft 131, wheel disc 132 and rotor blade 133.Wheel disc 132 is arranged on an end of main shaft 131.Preferably, main shaft 131 is the branch body structure with wheel disc 132, and main shaft 131 is connected through pull bar 134 with wheel disc 132.Main shaft 131 and wheel disc 132 are set to the manufacturing that the branch body structure can be convenient to each parts, and can guarantee both intensity.Rotor blade 133 is arranged on the excircle of wheel disc 132.It is understandable that rotor blade 133 can adopt prior art rotor blade structure commonly used, therefore no longer details.In order to make rotor have good margin of strength and to be applicable to the high speed Working environment, preferably, rotor blade 133 is fixed on the wheel disc 132 through vertical tree-like blade root.
See figures.1.and.2, bearing assembly comprises the clutch shaft bearing 141 and second bearing 142.The clutch shaft bearing 141 and second bearing 142 are arranged on the shell 120, and particularly, the clutch shaft bearing 141 and second bearing 142 can directly be arranged on the shell 120, also can be arranged on the shell 120 through strut member.Two ends of main shaft 131 can be rotatably set in the clutch shaft bearing 141 respectively and in second bearing 142, support main shaft 131 is carried out biradial.
Preferably, the ratio of the diameter of the depth of blade of stator blades 150 and rotor blade 133 and main shaft 131 is smaller or equal to 0.2.Rotor blade of the present invention and stator blades adopt the short blade design, and the natural frequency that can make blade avoids resonance to cause leaf destruction far above the excited frequency under the working speed.In addition, can also reduce the centrifugal tensile stress of rotor blade under high speed rotating, improve the intensity of blade.
High speed blast-furnace top gas recovery turbine machine 100 of the present invention is because the cantilever rotor structure that adopts biradial to support; Therefore have that device structure is simple, the rotating speed advantages of higher, and then high speed blast-furnace top gas recovery turbine machine 100 can be complementary with the rotating speed of blast furnace blowing engine.Like this, high speed blast-furnace top gas recovery turbine machine 100 can directly link to each other with blast furnace blowing engine, has not only saved the energy dissipation of wheel box, makes that also the axle of whole unit is the advantages of simple that becomes.In addition, the cantilever rotor structure that adopts biradial to support only needs at low pressure end the sealing gland assembly to be set, and has saved the sealing of high-pressure side, has therefore reduced the probability that accident occurs, guarantees the safety of equipment.Further, because high speed blast-furnace top gas recovery turbine machine 100 can have high rotational speed, the gas flow rate in the leaf grating is higher, therefore can alleviate the dust stratification problem.
According to one embodiment of the present invention, as depicted in figs. 1 and 2, rotor blade 133 is an one-level rotor blade structure, and stator blades 150 is an one-level stator blades structure.Adopt single step arrangement not only to make high speed blast-furnace top gas recovery turbine machine 100 have high rotational speed, being suitable for and the high speed situation of blast furnace blowing engine, but also have higher heat insulating ability with rotating speed.
Another embodiment is as shown in Figure 4 according to the present invention, and rotor blade 133 is secondary rotor blade structure (promptly comprising rotor blade 133A and 133B), and stator blades 150 is secondary stator blades structure (promptly comprising stator blades 150A and 150B).Adopt two-stage structure that high speed blast-furnace top gas recovery turbine machine 100 both can be operated in and the high-speed working condition of blast furnace blowing engine with rotating speed; Can be operated in the operating mode with generator or motor same rotational speed again, also make high speed blast-furnace top gas recovery turbine machine 100 have higher heat insulating ability.
Fig. 5 A is the synoptic diagram according to the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention; Fig. 5 B is the synoptic diagram according to the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention, and Fig. 5 C is the synoptic diagram according to the high speed blast-furnace top gas recovery turbine machine of one embodiment of the present invention.
The inlet end of high speed blast-furnace top gas recovery turbine machine 500 can adopt axial admission structure (shown in Fig. 5 A), the downward air intake structure (shown in Fig. 5 B) in footpath or radially go up air intake structure (shown in Fig. 5 C).
The exhaust side of high speed blast-furnace top gas recovery turbine machine 500 can adopt the footpath exhaust structure (shown in Fig. 5 A) or the exhaust structure (shown in Fig. 5 B) that directly makes progress downwards.
Air inlet and exhaust mode that high speed blast-furnace top gas recovery turbine machine 500 adopts are changeable, therefore can carry out individual layer layout or double-deck the layout according to the situation at scene, so that pipeline orientation and structural arrangement are all very flexibly.
The present invention is illustrated through the foregoing description, but should be understood that, the foregoing description just is used for for example and illustrative purposes, but not is intended to the present invention is limited in the described scope of embodiments.It will be appreciated by persons skilled in the art that in addition the present invention is not limited to the foregoing description, can also make more kinds of variants and modifications according to instruction of the present invention, these variants and modifications all drop in the present invention's scope required for protection.Protection scope of the present invention is defined by appended claims book and equivalent scope thereof.
Claims (10)
1. a high speed blast-furnace top gas recovery turbine machine is characterized in that, comprising:
Base;
Shell, said shell is connected on the said base, and said shell comprises inlet end and exhaust side;
Rotor, said rotor comprise main shaft, are arranged on the wheel disc of said main shaft one end and the rotor blade that is arranged on the excircle of said wheel disc;
Bearing assembly, said bearing assembly comprise the clutch shaft bearing and second bearing that is arranged on the said shell, two ends of said main shaft can be rotatably set in respectively in the said clutch shaft bearing with said second bearing in;
Stator blades, said stator blades are arranged on the internal surface of said shell and with said rotor blade and relatively are provided with, to match with said rotor blade; With
Sealing gland assembly, said sealing gland assembly are arranged between the end and said shell near said wheel disc of said main shaft, and said sealing gland assembly comprises near the labyrinth seal of said wheel disc with away from the carbocyclic ring sealing member of said wheel disc.
2. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that said carbocyclic ring sealing member is multistage carbocyclic ring sealing member, and between said multistage carbocyclic ring sealing member, fill nitrogen.
3. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that said main shaft and said wheel disc are for dividing body structure, said main shaft is connected through pull bar with said wheel disc.
4. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that said rotor blade is an one-level rotor blade structure, and said stator blades is an one-level stator blades structure.
5. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that said rotor blade is a secondary rotor blade structure, and said stator blades is a secondary stator blades structure.
6. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that said rotor blade is fixed on the said wheel disc through vertical tree-like blade root.
7. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that said high speed blast-furnace top gas recovery turbine machine also comprises the stator blades drive unit, is used to change the angle of said stator blades.
8. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that the ratio of the depth of blade of said stator blades and said rotor blade and the diameter of said main shaft is smaller or equal to 0.2.
9. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that the inlet end of said high speed blast-furnace top gas recovery turbine machine adopts axial admission structure, the downward air intake structure in footpath or radially goes up air intake structure.
10. according to the described high speed blast-furnace top gas recovery turbine of claim 1 machine, it is characterized in that the exhaust side of said high speed blast-furnace top gas recovery turbine machine adopts the footpath exhaust structure or the exhaust structure that directly makes progress downwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110341040.9A CN102363821B (en) | 2011-11-02 | 2011-11-02 | High speed blast furnace gas pressure turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110341040.9A CN102363821B (en) | 2011-11-02 | 2011-11-02 | High speed blast furnace gas pressure turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102363821A true CN102363821A (en) | 2012-02-29 |
| CN102363821B CN102363821B (en) | 2014-01-29 |
Family
ID=45690414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110341040.9A Expired - Fee Related CN102363821B (en) | 2011-11-02 | 2011-11-02 | High speed blast furnace gas pressure turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102363821B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612760A (en) * | 2013-11-01 | 2015-05-13 | 中国石化工程建设有限公司 | Energy recycling tail gas turbine |
| CN107084312A (en) * | 2017-04-05 | 2017-08-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of Blast Furnace Gas Turbine nitrogen-sealed system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5464210A (en) * | 1977-10-31 | 1979-05-23 | Mitsubishi Heavy Ind Ltd | High pressure gas energy recovery apparatus |
| CN201144714Y (en) * | 2008-01-09 | 2008-11-05 | 成都发动机（集团）有限公司 | Disc draft type capacity-adjustable TRT |
| CN201232064Y (en) * | 2008-07-30 | 2009-05-06 | 陕西博尔透平机械有限公司 | Energy recovery apparatus for mono-layer layout stove blower set |
| CN201714430U (en) * | 2010-07-09 | 2011-01-19 | 兰州长城机械工程有限公司 | Rotor blade sealing device for flue gas turbine |
| CN201778840U (en) * | 2010-05-19 | 2011-03-30 | 德阳东方数控科技有限公司 | Gas-tight structure of turbine spindle |
| CN201835877U (en) * | 2009-12-08 | 2011-05-18 | 成都发动机（集团）有限公司 | Coal gas excessive pressure turbine for blast furnace with radial air inlet and axial exhaust |
-
2011
- 2011-11-02 CN CN201110341040.9A patent/CN102363821B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5464210A (en) * | 1977-10-31 | 1979-05-23 | Mitsubishi Heavy Ind Ltd | High pressure gas energy recovery apparatus |
| CN201144714Y (en) * | 2008-01-09 | 2008-11-05 | 成都发动机（集团）有限公司 | Disc draft type capacity-adjustable TRT |
| CN201232064Y (en) * | 2008-07-30 | 2009-05-06 | 陕西博尔透平机械有限公司 | Energy recovery apparatus for mono-layer layout stove blower set |
| CN201835877U (en) * | 2009-12-08 | 2011-05-18 | 成都发动机（集团）有限公司 | Coal gas excessive pressure turbine for blast furnace with radial air inlet and axial exhaust |
| CN201778840U (en) * | 2010-05-19 | 2011-03-30 | 德阳东方数控科技有限公司 | Gas-tight structure of turbine spindle |
| CN201714430U (en) * | 2010-07-09 | 2011-01-19 | 兰州长城机械工程有限公司 | Rotor blade sealing device for flue gas turbine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612760A (en) * | 2013-11-01 | 2015-05-13 | 中国石化工程建设有限公司 | Energy recycling tail gas turbine |
| CN104612760B (en) * | 2013-11-01 | 2017-02-01 | 中国石化工程建设有限公司 | Energy recycling tail gas turbine |
| CN107084312A (en) * | 2017-04-05 | 2017-08-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of Blast Furnace Gas Turbine nitrogen-sealed system |
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| Publication number | Publication date |
|---|---|
| CN102363821B (en) | 2014-01-29 |
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Granted publication date: 20140129 |