CN202793038U - Cement kiln rear-end heat recovery boiler with mechanical brush dust-removing devices - Google Patents
Cement kiln rear-end heat recovery boiler with mechanical brush dust-removing devices Download PDFInfo
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- CN202793038U CN202793038U CN2012203625186U CN201220362518U CN202793038U CN 202793038 U CN202793038 U CN 202793038U CN 2012203625186 U CN2012203625186 U CN 2012203625186U CN 201220362518 U CN201220362518 U CN 201220362518U CN 202793038 U CN202793038 U CN 202793038U
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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
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Abstract
A cement kiln rear-end heat recovery boiler with mechanical brush dust-removing devices is mainly characterized in that a drum is arranged on a support, a convection shaft is arranged in the support, a flue gas inlet is arranged at one end of the convection shaft, and a flue gas outlet is arranged at the other end of the convection shaft. A superheater, an evaporator and an economizer, which are fixed on a ventilation beam, are arranged in the convection shaft sequentially from the flue gas inlet to the flue gas outlet. Mechanical brush dust-removing devices are arranged on heated surfaces in the cement kiln tail heat recovery boiler, an outside transmission device is connected with an inside dust-removing device, the inside dust-removing device is provided with a frame-type brush fixing device, steel wire brushes respectively fixed on a frame are arranged at the upper end and the lower end of the fixing device, two sets of rollers are arranged at the bottom of the brush fixing device, each set of rollers are disposed on one guide rail, and two ends of each of the two guide rails are connected with the ventilation beam of the boiler and an inner protective plate. The cement kiln rear-end heat recovery boil is low in investment, convenient to modify, thorough in dust removing and high in heat transmission efficiency.
Description
Technical fieldThe utility model relates to waste heat boiler, particularly to the exhaust-heat absorption of cement kiln exit gas and the waste heat boiler of effective removing heat-transfer surface dust stratification.
Background technologyAt present domestic water stall low temperature exhaust heat reclaims to get comparatively extensive use, this technology is to utilize cement kiln tail waste heat boiler, cement kiln kiln hood waste heat boiler and cement kiln kiln hood independence superheater, and the waste heat that reclaims the flue gas in the cement production process produces the superheated steam of different pressures for the Steam Turbine generating.
From the cement kiln UTILIZATION OF VESIDUAL HEAT IN, present kiln waste heat without additional fuel for power generation technology does not still reach the purpose that the waste heat in the cement production process is all recycled, and the kiln waste heat without additional fuel for power generation technology still has great progress space.Waste heat boiler is as very important Thermal Equipment in the cement kiln UTILIZATION OF VESIDUAL HEAT IN process, and the height of all the other heat recovery efficiencies directly affects cement kiln residual heat generating efficiency.
The cogeneration thermal source is divided into two parts in pure cryogenic system, a part is the waste gas that produces after the kiln tail preheater preheated raw meal, another part is the hot-air behind the kiln hood grate-cooler cooling grog, the waste gas of kiln tail is more stable in the little situation of cement kiln change of production in this two parts thermal source, and heat proportion in system is larger.What and the technical process fluctuation ratio along with the cooling clinker quantity of kiln hood thermal source are larger, and thermal source is unstable, and heat how to make good use of like this kiln tail waste heat flue gas in system is stablized waste heat recovery and electricity generation system and occupied an important position.
Kiln tail waste heat boiler is arranged between afterbody preheater and the kiln tail main exhaust fan.EGT is generally between 300～400 ℃, and dustiness is high, is generally under the status of criterion dust content in stack gas about 70 ~ 120g/Nm3.For kiln tail waste heat boiler, maximum difficult point is the low-grade and ash-rich of how to tackle flue gas.Because low-gradely mean huge heat exchange area, only have and reduce the product that the heating surface cost just can provide high performance-price ratio; Boiler is in the production run process, the surface such as its heating surface-superheater, evaporimeter, economizer is dust stratification easily, that dust adheres to and the ash-rich in the flue gas brings, boiler heating surface is conducted heat to be weakened, cause boiler thermal output to reduce, simultaneously, the boiler waste gas resistance increment affects the cement kiln operation and reduces the production load.And, in case when fouling of heating surface and slagging scorification are serious, also may cause unexpected blowing out, cause heavy economic losses.
The kiln tail waste heat boiler dust stratification is inevitably, and how deashing then is the problem that needs to consider solution behind the dust stratification.The purge mode of kiln tail waste heat boiler mainly contains at present: the modes such as sonic soot blowing, flammable gas explosion deashing, steam deashing and vibration dust-cleaning.Has the characteristic of carefully gluing owing to the dust in the cement kiln exit gas, the energy that acoustic wave ash ejector blows ash is less, because energy shortage (present maximum acoustic energy is about 140 decibels), very large with the intrinsic frequency difference of soot particle, inadaptable with the dust stratification characteristic, blow grey poor effect, basically can not remove existing dust stratification, can only when it blows ash, stop the generation of dust stratification.Shock wave soot blower is owing to the energy that blows ash is large than acoustic wave ash ejector, blow relatively better still this technology of grey effect and also have certain deficiency, at first the range of application on boiler is very narrow, owing to very easily entrainment the consideration of the aspects such as high-temperature flue gas and gas leakage after the detonation, can only be applied at present the relatively low back-end ductwork bottom of temperature (such as air preheater etc.).The vibration that causes when secondly, producing shock wave is on there being certain impact in service life of generator tube.Again, there is certain potential safety hazard in this system, because working media is fuel gas, in case project organization is unreasonable, the quality of production has problem, all easily causes the leakage of fuel gas, thereby causes burner hearth or environment generation security incident.Steam sootblower is traditional soot blower, use with a long history, but because structure and medium add the impact of hot environment, exist blowing pipe yielding, machinery is stuck, put in and can not move back out, drive disk assembly easy break-down, complex structure take up room greatly, require maintenance levels higher, dedicated platform is set, consumes the shortcomings such as steel are many.At present, domestic and international most kiln tail waste heat boiler all adopts the purge mode of mechanical vibrator, but, because mechanical vibrator is the mode that adopts continuous rapping, impact in service life on heating surface is larger, along with the prolongation of time, be easy to cause heating surface and the welding junction of importing and exporting header to be damaged, thereby cause leakage accident.
Summary of the invention:
The utility model purpose is to provide a kind of small investment, transforms the cement kiln tail waste heat boiler with the brusher deashing device convenient, that deashing is thorough, UTILIZATION OF VESIDUAL HEAT IN efficient is high.
The utility model mainly includes support, to flow through shaft and drum.Wherein, support is the framework that is made of column and crossbeam.Be provided with drum at this support, be provided with in the support flow through shaft, flow through shaft is made of housing, smoke inlet, exhanst gas outlet and heat-transfer surface; Wherein, be furnace wall to the housing of flow through shaft, namely establishes insulation material in the middle of the inside and outside two-layer backplate, such as calcium silicate board, alumina silicate fiber felt or rock wool etc., the side of inner casing in furnace chamber is provided with refractory concrete.Flow through shaft housing one end is connected smoke inlet, and the housing other end connects exhanst gas outlet.To being provided with successively superheater, evaporimeter, the economizer that is fixed on the crossbeam by smoke inlet to exhanst gas outlet in the flow through shaft.Described drum, superheater, evaporimeter and economizer can be the M covers, M 〉=1.Described superheater, evaporimeter and economizer all are comprised of import and export header and the tube bank of being heated, and an end of the tube bank of being heated links to each other with the entrance header, and the other end links to each other with outlet header, and the import and export header all is located on the crossbeam outside the flow through shaft housing.Wherein, the entrance header of economizer links to each other with supply line, and the outlet header of economizer links to each other with drum by pipeline; Drum links to each other with the entrance header of evaporimeter by down-comer, and the outlet header of evaporimeter links to each other with drum by tedge, consists of closed circuit; Drum also links to each other with the entrance header of superheater by pipeline, and the outlet header of superheater is sent by pipeline, is used for pushing turbine generating or production and application.
Each heating surface is established the brusher deashing device in above-mentioned kiln tail waste heat boiler device, and described brusher deashing device comprises external transmission device and inner deashing device.Its version of described external transmission device has a variety of, such as lead screw transmission, chain drive, hoist engine transmission, rack-and-pinion transmission or hydraulic drive etc.Above-mentioned external transmission device links to each other with inner deashing device, driving inner deashing device moves back and forth, this inside deashing device has a frame-type brush fixture, two ends are separately fixed at the wire brush on the framework about this fixture is provided with, and these wire brushes all with the per two groups of heat exchanger tubes row of boiler between the position corresponding, preferably adopt interference fits between wire brush bristle part and heat exchanger tube row surface, the quantity of row's wire brush is N+1 of described row's heat exchanger tube quantity.Brush fixture bottom is provided with two groups of rollers, and every group of roller places on the guide rail, and the two ends of two guide rails link to each other with inner casing with the boiler draft beam.
The utility model compared with prior art has following advantage:
The row brush bristle of deashing device directly contacts the tube bank of being heated and carries out deashing, and externally bristle is done directed the reciprocating motion under the transmission mechanism effect:
A, ideal to the ash-removal effect of intensive convection bank in the boiler, brush directly contacts with tube wall, and dust is brushed off, and makes the heat transfer coefficient of kiln tail waste heat boiler improve about 10%.
B, improve the steam production of kiln tail waste heat boiler, reduced kiln tail waste heat boiler toxic emission temperature.
C, realize external transmission device and the mode that inner deashing device separates interlock, avoided arranging the problem of too much seal, simple to operate, improved ash-removal effect, saved operating cost.
Description of drawings
Fig. 1 is that the two pressure waste heat boiler masters of the utility model " U " type kiln tail look simplified schematic diagram.
Fig. 2 is that the utility model " I " type kiln tail single-pressure HGSR master looks simplified schematic diagram.
Fig. 3 is that the utility model brusher deashing device master looks simplified schematic diagram.
Fig. 4 is that the utility model lead screw transmission brusher deashing device master looks simplified schematic diagram.
Fig. 5 is that the utility model hoist engine gearing brush deashing device master looks simplified schematic diagram.
Fig. 6 is that the utility model hoist engine gearing brush deashing device is overlooked simplified schematic diagram.
Fig. 7 is that the utility model chain drive brusher deashing device master looks simplified schematic diagram.
Fig. 8 is that the utility model chain drive brusher deashing device is overlooked simplified schematic diagram.
Fig. 9 is that the utility model rack-and-pinion gearing brush deashing device master looks simplified schematic diagram.
Figure 10 is that the utility model rack-and-pinion gearing brush deashing device is overlooked simplified schematic diagram.
Figure 11 is that the utility model hydraulic machinery brush deashing device master looks simplified schematic diagram.
Figure 12 is that the utility model hydraulic machinery brush deashing device is overlooked simplified schematic diagram.
Marginal data:
1 support, 2 pairs of flow through shaft are pressed drum in 3 times, 4 low pressure drums, 5 smoke inlets, 6 exhanst gas outlets, press superheater in 7 times, press evaporimeter in 8 times, press economizer in 9 times, 10 low-pressure superheaters, 11 low pressure evaporators, 12 low-pressure coal savers, 13 external transmission device, 14 inner deashing devices are pressed super-heater exit case in 15 times, press superheater entrance header in 16 times, press the evaporator outlet header in 17 times, press the evaporator inlet header in 18 times, press the economizer exit header in 19 times, press economizer entrance header, 21 low-pressure superheater outlet headers in 20 times, 22 low-pressure superheater entrance headers, 23 low pressure evaporator outlet headers, 24 low pressure evaporator entrance headers, 25 low-pressure coal saver outlet headers, 26 low-pressure coal saver entrance headers, 27 down-comers, 28 tedges, 29 brush fixtures, 30 steel brushes, 31 guide rails, 32 rollers, 33 motors, 34 decelerators, 35 sprocket transmission devices, 36 leading screws, 37 bearings, 38 supports, 39 axis of guides, 40 slide blocks, 41 drive links, 42 universal connecting bases, 43 reciprocating motors, 44 reductors, 45 hoist engines, 46 steel wire ropes, 47 drive sprockets, 48 driven sprockets, 49 chains, 50 gears, 51 tooth bars, 52 hydraulic cylinders, 53 hydraulic stems, 54 connecting rods.
The specific embodiment
Look in the simplified schematic diagram a kind of two pressure " U " type kiln tail waste heat boiler masters with the brusher deashing device shown in Figure 1, support 1 is the framework that is made of column and crossbeam, pressure drum 3 and low pressure drum 4 in this support is provided with time, be provided with in the support flow through shaft 2, housing to flow through shaft is furnace wall, namely establish the rock wool heat-preservation material in the middle of inside and outside two backplates, the side of inner casing in the well chamber is provided with refractory concrete.An end on the flow through shaft housing is connected smoke inlet 5, and the housing other end connects exhanst gas outlet 6.To being provided with successively time middle superheater 7, inferior middle pressure evaporimeter 8, inferior middle pressure economizer 9, low-pressure superheater 10, low pressure evaporator 11 and the low-pressure coal saver 12 of pressing that is fixed on the ventilation beam by smoke inlet to exhanst gas outlet in the flow through shaft.Described superheater, evaporimeter and economizer all are comprised of import and export header and the tube bank of being heated, and an end of the tube bank of being heated links to each other with the entrance header, and the other end links to each other with outlet header, and the import and export header all is located on the crossbeam outside the flow through shaft housing.Wherein, the entrance header 20 of inferior middle pressure economizer links to each other with supply line, and the outlet header 19 of inferior middle pressure economizer links to each other with inferior middle pressure drum by pipeline; Inferior middle pressure drum links to each other with the entrance header 18 of inferior middle pressure evaporimeter by down-comer 27, and the outlet header 17 of inferior middle pressure evaporimeter links to each other with inferior middle pressure drum by tedge 28, consists of closed circuit; Inferior middle pressure drum also links to each other with the entrance header 16 of inferior middle pressure superheater by pipeline, and the outlet header of inferior middle pressure superheater 15 is sent by pipeline, is used for pushing turbine generating or production and application as main vapour; The entrance header 26 of low-pressure coal saver links to each other with supply line, and the outlet header 25 of low-pressure coal saver links to each other with the low pressure drum by pipeline; The low pressure drum links to each other with the entrance header 24 of low pressure evaporator by down-comer 27, and the outlet header 23 of low pressure evaporator links to each other with the low pressure drum by tedge 28, consists of closed circuit; The low pressure drum also links to each other with the entrance header 22 of low-pressure superheater by pipeline, and the outlet header of low-pressure superheater 21 is sent by pipeline, is used for pushing turbine generating or production and application as filling.Each heating surface is established the brusher deashing device in above-mentioned kiln tail waste heat boiler device, and described brusher deashing device comprises external transmission device 13 and inner deashing device 14.
Look in the simplified schematic diagram a kind of single pressure " I " type kiln tail waste heat boiler master with the brusher deashing device shown in Figure 2, support is the framework that is made of column and crossbeam, pressure drum in this support is provided with time, be provided with in the support flow through shaft, housing to flow through shaft is furnace wall, namely establish the rock wool heat-preservation material in the middle of inside and outside two backplates, the side of inner casing in the well chamber is provided with refractory concrete.An end on the flow through shaft housing is connected smoke inlet, and the housing other end connects exhanst gas outlet.To being provided with successively time middle superheater, inferior middle pressure evaporimeter and the inferior middle pressure economizer of pressing that is fixed on the ventilation beam by smoke inlet to exhanst gas outlet in the flow through shaft.Described superheater, evaporimeter and economizer all are comprised of import and export header and the tube bank of being heated, and an end of the tube bank of being heated links to each other with the entrance header, and the other end links to each other with outlet header, and the import and export header all is located on the crossbeam outside the flow through shaft housing.Wherein, the entrance header of inferior middle pressure economizer links to each other with supply line, and the outlet header of inferior middle pressure economizer links to each other with inferior middle pressure drum by pipeline; Inferior middle pressure drum links to each other with the entrance header of inferior middle pressure evaporimeter by down-comer, and the outlet header of inferior middle pressure evaporimeter links to each other with inferior middle pressure drum by tedge, consists of closed circuit; Inferior middle pressure drum also links to each other with the entrance header of inferior middle pressure superheater by pipeline, and the outlet header of inferior middle pressure superheater is sent by pipeline, is used for pushing turbine generating or production and application; Each heating surface is established the brusher deashing device in above-mentioned kiln tail waste heat boiler device, and described brusher deashing device comprises external transmission device and inner deashing device.
Look in the simplified schematic diagram the utility model mechanical ash removing device master shown in Figure 3, external transmission device 13 links to each other with inner deashing device 14, this inside deashing device has a frame-type brush fixture 29, two ends are separately fixed at the wire brush 30 on the framework about this fixture is provided with, and these wire brushes all with the per two groups of heat exchanger tubes row of boiler between the position corresponding, adopt interference fits between wire brush bristle part and heat exchanger tube row surface, the quantity of one row's wire brush is N+1 of described row's heat exchanger tube quantity, and the spacing between two row's wire brushes is the stroke of described external transmission device drive link.Brush fixture bottom is provided with two groups of rollers 32, and every group of roller places on the guide rail 31, and the two ends of two guide rails link to each other with inner casing with the boiler draft beam.
Look in the simplified schematic diagram the utility model lead screw transmission brusher deashing device master shown in Figure 4, motor 33 links to each other with reductor 34, this reductor links to each other with chain and sprocket driving device 35 1 ends, this sprocket transmission device other end links to each other with an end of leading screw 36, the two ends of this leading screw are respectively equipped with bearing 37, and this bearing is located at respectively on two supports of bearing 38.Above-mentioned two bearings support is respectively equipped with two pairs of through holes, and another of its correspondence is provided with the slide block corresponding with it 40 to being provided with the axis of guide parallel with leading screw 39 in the through hole at above-mentioned leading screw and the axis of guide, and an end of this slide block and the drive link 41 parallel with leading screw links to each other.Above-mentioned drive link passes another set through hole on the transmission mechanism support of bearing far away, and the end links to each other with brush fixture 29 by universal connecting base 42.
Brush in the deashing device simplified schematic diagram at Fig. 5 and the utility model hoist engine gearing shown in Figure 6, brusher deashing device 14 outsides one side is provided with reciprocating motor 43 and coupled reductor 44, this reductor and hoist engine 45 link to each other by shaft coupling, the winding roller of this hoist engine is located at inner deashing device outside opposite side, and the steel wire rope 46 on this hoist engine links to each other with brush fixture 29 bottoms.
In Fig. 7 and the utility model chain drive brusher deashing device simplified schematic diagram shown in Figure 8, inner deashing device 14 outsides one side is provided with reciprocating motor 43 and coupled reductor 44, this reductor output is drive sprocket 47, the driven sprocket 48 that is mated is located at inner deashing device outside opposite side, with the chain 49 of two sprocket wheels coupling, their two ends link to each other with two ends, brush fixture 29 bottom respectively.
Brush in the deashing device simplified schematic diagram at Fig. 9 and the utility model rack-and-pinion gearing shown in Figure 10, inner deashing device 14 outsides one side is provided with reciprocating motor 43 and coupled reductor 44, this reductor output is gear 50, and tooth bar 51 1 ends that are mated link to each other with brush fixture 29 bottoms.
Brush in the deashing device simplified schematic diagram at Figure 11 and the utility model hydraulic machinery shown in Figure 12, inner deashing device 14 outsides one side is provided with horizontally disposed hydraulic cylinder 52, and its hydraulic stem 53 ends link to each other with brush fixture 29 bottoms by connecting rod 54.
Claims (5)
1. cement kiln tail waste heat boiler with the brusher deashing device, it is characterized in that: support is provided with drum, be provided with in the support flow through shaft, an end on the housing of flow through shaft is connected smoke inlet, the other end of housing connects exhanst gas outlet, to being provided with successively the superheater that is fixed on the beam to exhanst gas outlet by smoke inlet in the flow through shaft, evaporimeter and economizer, described superheater, evaporimeter and economizer all are by advancing, outlet header and the tube bank of being heated form, the end of restraining that is heated links to each other with the entrance header, the other end links to each other with outlet header, and advances, outlet header all is located on the crossbeam outside the flow through shaft housing; Each heating surface is established the brusher deashing device in above-mentioned kiln tail waste heat boiler device, described brusher deashing device comprises external transmission device and inner deashing device, above-mentioned external transmission device links to each other with inner deashing device, this inside deashing device has a frame-type brush fixture, two ends are separately fixed at the wire brush on the framework about this fixture is provided with, and these wire brushes all with the per two groups of heat exchanger tubes row of boiler between the position corresponding, brush fixture bottom is provided with two groups of rollers, every group of roller places on the guide rail, and the two ends of two guide rails link to each other with inner casing with the boiler draft beam.
2. the cement kiln tail waste heat boiler with the brusher deashing device according to claim 1, it is characterized in that: the entrance header of economizer links to each other with supply line, and the outlet header of economizer links to each other with drum by pipeline; Drum links to each other with the entrance header of evaporimeter by down-comer, and the outlet header of evaporimeter links to each other with drum by tedge, consists of closed circuit; Drum also links to each other with the entrance header of superheater by pipeline, and the outlet header of superheater is sent by pipeline.
3. the cement kiln tail waste heat boiler with the brusher deashing device according to claim 1 and 2 is characterized in that: described drum, superheater, evaporimeter and economizer can be the M covers, M 〉=1.
4. the cement kiln tail waste heat boiler with the brusher deashing device according to claim 3 is characterized in that: adopt interference fits between wire brush bristle part and heat exchanger tube row surface.
5. the cement kiln tail waste heat boiler with the brusher deashing device according to claim 3 is characterized in that: the quantity of row's wire brush is N+1 of described row's heat exchanger tube quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203625186U CN202793038U (en) | 2012-07-25 | 2012-07-25 | Cement kiln rear-end heat recovery boiler with mechanical brush dust-removing devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203625186U CN202793038U (en) | 2012-07-25 | 2012-07-25 | Cement kiln rear-end heat recovery boiler with mechanical brush dust-removing devices |
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| CN202793038U true CN202793038U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012203625186U Expired - Fee Related CN202793038U (en) | 2012-07-25 | 2012-07-25 | Cement kiln rear-end heat recovery boiler with mechanical brush dust-removing devices |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721286A (en) * | 2012-06-12 | 2012-10-10 | 大连易世达新能源发展股份有限公司 | Double-pressure submerged arc furnace waste heat boiler with mechanical brush ash-removing device |
| CN104654263A (en) * | 2015-02-16 | 2015-05-27 | 盐城市锅炉制造有限公司 | Kiln tail and bypath wind releasing residual heat boiler of cement kiln |
| CN104748560A (en) * | 2014-12-31 | 2015-07-01 | 盐城市锅炉制造有限公司 | Method and system for recycling low-temperature flue gas waste heat of kiln head clinker cooler of cement plant |
-
2012
- 2012-07-25 CN CN2012203625186U patent/CN202793038U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721286A (en) * | 2012-06-12 | 2012-10-10 | 大连易世达新能源发展股份有限公司 | Double-pressure submerged arc furnace waste heat boiler with mechanical brush ash-removing device |
| CN104748560A (en) * | 2014-12-31 | 2015-07-01 | 盐城市锅炉制造有限公司 | Method and system for recycling low-temperature flue gas waste heat of kiln head clinker cooler of cement plant |
| CN104654263A (en) * | 2015-02-16 | 2015-05-27 | 盐城市锅炉制造有限公司 | Kiln tail and bypath wind releasing residual heat boiler of cement kiln |
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Address after: Floor 20, block B, No. 32a, Torch Road, high tech Industrial Park, Dalian, Liaoning Province, 116000 Patentee after: Lida Group Co.,Ltd. Address before: 116023, B building, No. 32, Torch Road, Dalian hi tech Zone, Liaoning, 18 Patentee before: DALIAN EAST NEW ENERGY DEVELOPMENT Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20210725 |