CN201901421U - Semidry sludge conveying device - Google Patents
Semidry sludge conveying device Download PDFInfo
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- CN201901421U CN201901421U CN2010206411264U CN201020641126U CN201901421U CN 201901421 U CN201901421 U CN 201901421U CN 2010206411264 U CN2010206411264 U CN 2010206411264U CN 201020641126 U CN201020641126 U CN 201020641126U CN 201901421 U CN201901421 U CN 201901421U
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- incinerator
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- 239000010802 sludge Substances 0.000 title claims abstract description 119
- 239000002918 waste heat Substances 0.000 claims abstract description 7
- 238000012546 transfer Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000005201 scrubbing Methods 0.000 claims description 5
- 241001417527 Pempheridae Species 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 238000009428 plumbing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000010865 sewage Substances 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 14
- 230000032258 transport Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 4
- 101100272852 Clostridium botulinum (strain Langeland / NCTC 10281 / Type F) F gene Proteins 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
A semidry sludge conveying device belongs to the field of solid waste disposal. A sludge outlet of a sludge dryer is positioned above a belt conveyor, a sludge outlet of the belt conveyor is connected with a feeding hopper of a sludge bucket lifter, a hopper of the sludge bucket lifter on the same altitude with a feeding inlet of a sludge incinerator is connected with a screw conveyor at an inlet of the sludge incinerator, a sludge outlet of the screw conveyor is connected with the sludge incinerator, the sludge incinerator is connected with a waste heat boiler and a burner, and a washing tower is connected with the sludge dryer through a pipeline. The semidry sludge conveying device is used for conveying semidry sludge with 30%-40% moisture content, has the advantages of low conveying resistance, high conveying capacity, simple structure, high automation level and the like, and is a complete conveying device for incinerating sludge generated in urban sewage treatment in a reducing, harmless and stable manner.
Description
Technical field
The utility model relates to a kind of semi-dry sludge feedway, belongs to the solid waste process field.
Background technology
Along with China's rapid development of economy and urbanization process are accelerated, the process load of the dirty waste water in China city and generation sludge quantity also increase very fast, what mud stabilized treatment facility was arranged in the existing sewage treatment facility is less than 1/4, what treatment process and corollary equipment were comparatively perfect is less than 1/10, and can normally move more few in number.Following Treatment of Sludge strategy is to reach a good balance between generation, disposal and the environmental protection that makes mud.The optimal path that reaches this balance is the recycling of mud.Therefore a kind of actv. Treatment of Sludge method of disposal should be taken into account environmental ecological benefit, social benefit and economic benefit.
The disposal approach of city sewage and sludge comprises soil utilization, sanitary landfill, burning disposal and water body method such as dissolve, and these methods can both be held a large amount of city sewage and sludges.Because what domestic Treatment of Sludge was disposed starts late, in overall city planning is not included the sludge disposal place in many cities.Cause a lot of treatment plants to be difficult to find suitable mud and mud to throw aside the place.The degree of utilization of mud is not very high generally, and is improper if mud is thrown aside, and both environment caused secondary pollution, can cause the waste of sludge resource yet.
Sludge incineration technology has in recent years progressively become the main flow of handling mud, more and more is subjected to the favor of countries in the world.At present, mummification+burning is the main technique that developed country's Treatment of Sludge is disposed, and also is the developing direction that China's Treatment of Sludge is disposed.In general, the mechanical dehydration technology can only be reduced to the water ratio of mud about 75%, high water ratio like this, make that the calorific value of mud own is lower, be unfavorable for the subsequent transportation and the disposal of mud, therefore, make mud obtain the utilization of actv. processing and resource, the sludge drying link is inevitably, is the important step of sludge incineration treatment and disposal.If make semi-dry sludge enter into incinerator, need suitable load transfer device inevitably to satisfy the demand of treatment process through mummification.Because the existing Treatment of Sludge facility of China is intensive, the mass transport amount is big, (the belt transmission of traditional transportation mode, transportation modes such as screw rod pumping and truck tank car) can't satisfy the operating needs of mass transport, therefore must develop a kind of transport efficiency, semi-dry sludge feedway that degree of automation is high of improving.
Summary of the invention
In order to overcome the deficiency of traditional conveying arrangement, the utility model provides a kind of semi-dry sludge feedway.
The delivery system of semi-dry sludge is the bridge that connects between sludge drying and the burning two big core process, is the important component part in the sludge anhydration burning project.At characteristics such as China's municipal sludge characteristic, treatment and disposal mode and relevant devices, a kind of semi-dry sludge feedway mainly is to solve in the prior art sludge calorific value instability in the sludge incineration process, burn unsettled technical matters.Make mud when burning, can obtain fully and stabilized combustion, this delivery system device is simple, expense is cheap, can reduce transporting resistance, reduce consuming, far and near distance is carried and all can, not only improved processing capacity, and guaranteed the smooth operation of sludge incineration technology can make mud obtain maximum using, effectively utilize renewable resource.
A kind of semi-dry sludge feedway mainly comprises band conveyor, bucket elevator, conveyor screw:
The sludge drier mud mouth is positioned at the top of band conveyor;
The band conveyor mud mouth is connected with the feeder hopper of mud bucket elevator;
The silo that is positioned at the mud bucket elevator above the sludge incinerator inlet point height links to each other with the conveyor screw of sludge incinerator entrance;
The mud mouth of conveyor screw connects sludge incinerator;
Sludge incinerator is connected with combustion engine with waste heat boiler;
Scrubbing tower and sludge drier pass through plumbing connection.
Band conveyor is with the continuous Transport Machinery of load-transfer device as flexible traction organ, and load-transfer device also is the working component of carrying material (mud) usually.Load-transfer device forms an osed top cycling mechanism under the supporting role of head roll, guide pulley and carrying roller equivalent-load parts, dynamic action by starter gear, rely on the friction force between head roll and the load-transfer device, make load-transfer device make continuous movement, semi-dry sludge rely on and load-transfer device between friction, run near the incinerator with load-transfer device.
Bucket elevator is the bont of semi-dry sludge, and mud is risen to incinerator inlet point height.
Conveyor screw is usually used in the conveying than diffusing shape particle of transportation in the short range or piece material (mud).Conveyor screw belongs to the continuous Transport Machinery of no flexible traction organ.Its principle of work is: rotated in a hopper by the turning cylinder with flight, make the material of packing in the hopper because self gravitation and to the effect of the friction force of hopper, and do not rotate with flight, only migrate forward along hopper.Because it can control the transportation volume in the unit time more exactly, thereby also often is used to quantitative feed or drawing mechanism, as the mandatory auger feeder in the air-transport system etc.Adopt conveyor screw not only to increase the available space of convey materials, avoided the putty phenomenon to produce basically, removed artificial mediation work simultaneously from, guarantee the even conveying of material amount, make sufficient combustion, improved working environment simultaneously.Semi-dry sludge just evenly enters in the incinerator continuously by conveyor screw.
A kind of semi-dry sludge carrying method promptly from the semi-dry sludge of drier output, is at first delivered near the incinerator by band conveyor; Rise to incinerator inlet point height by bucket elevator then; By conveyor screw mud is sent into CIU at last, contains following steps:
(1) the semi-dry sludge water ratio by drier output is 30%～40%, by starting the dynamic action of band conveyor, relies on the friction force between semi-dry sludge and the load-transfer device, and semi-dry sludge is delivered near the incinerator bucket elevator continuously equably.
(2) bucket elevator is the bont of dewatered sludge, the semi-dry sludge that transports is risen in the dewatered sludge hopper of incinerator inlet point height.
(3) semi-dry sludge is sent into mud feed hopper in the CIU by feed hopper bottom equably by spiral conveyer, and mud is delivered to by feed hopper and carried out burning disposal in the incinerator.Conveyor screw is rotated in hopper by the turning cylinder with flight, makes the mud of packing in the hopper because self gravitation and to the effect of the friction force of hopper is only migrated forward along hopper, finishes the transportation work of sludge incineration.
The characteristics that the utlity model has:
(1) band conveyor have transporting resistance little, carry sludge quantity big, finish conveying by the friction between mud and the load-transfer device, but have simple in structure, consume advantages such as reducing the uphill/downhill transmission.
(2) this semi-dry sludge delivery system, economic benefit height, degree of automation height need not operational throughput, but remote control and regulation, monitoring in real time etc.
(3) a whole set of delivery system device is simple, can reduce transporting resistance, far and near distance carry all can, improved treatment effeciency, guaranteed the smooth operation of sludge incineration technology, make mud obtain maximum using, effectively utilized renewable resource.
Municipal sludge has thickness character, material pipe is carried with dispose the technical barrier that combines in order to solve, the utility model is used to carry the semi-dry sludge of water ratio 30%～40%, has characteristics such as transporting resistance is little, the material conveying amount is big, simple in structure, degree of automation height.Relate in particular to the mud that municipal sewage treatment is produced and carry out minimizing, the complete feedway of burning disposal innoxious, stabilization.
Description of drawings
Fig. 1 is the flow scheme of a kind of semi-dry sludge feedway of the utility model.
The structural representation of a kind of semi-dry sludge feedway of Fig. 2 the utility model.
Among the figure: sludge drier 1, band conveyor 2, mud bucket elevator 3, conveyor screw 4, sludge incinerator 5, waste heat boiler 6, scrubbing tower 7 and combustion engine 8.
The specific embodiment
Obviously, the many modifications and variations done based on aim of the present utility model of those skilled in the art belong to protection domain of the present utility model.
Embodiment 1
As shown in Figure 1, 2, a kind of semi-dry sludge feedway,
(1) band conveyor 2 links to each other with the bottom of sludge drier 1, by drier 1 output water ratio is that 30%～40% semi-dry sludge enters in the band conveyor 2, by starting the dynamic action of band conveyor 2, semi-dry sludge rely on and load-transfer device between friction force, semi-dry sludge is delivered near the incinerator 5 bucket elevator 3 continuously equably.
(2) air is adopted in the carrier gas in the sludge drier 1,7 washings remove moisture through scrubbing tower in the wet carrier gas that drier 1 comes out (between 85～90 ℃), carrier gas temperature after the washing is about 50 ℃, carrier gas major part after the washing is sent back in the drier 1 and is recycled, and small part is sent into burning disposal in the incinerator 5.
(3) bucket elevator 3 is bonts of dewatered sludge, the semi-dry sludge that transports is risen in the dewatered sludge hopper of incinerator 5 inlet point height.
(4) mud is sent into mud feed hopper in the CIU by feed hopper bottom equably by spiral conveyer 4, and mud is delivered to by the feed hopper bottom and carried out burning disposal in the incinerator 5.
(5) waste heat boiler 6 is mainly used in the waste heat that reclaims incineration flue gas.
At technical elements, the load transfer device of this method research is applied widely, not only in field of sludge treatment, is applicable to the semi-dry sludge of the big-and-middle-sized sludge incineration of transportation factory, and as solid useless, the useless processing of endangering, aspects such as house refuse also can be used in other burning field.
Embodiment 2
At present, China is in the starting development phase aspect Treatment of Sludge.So the domestic successful operation example that does not still have this type of large-scale sludge anhydration burning project is temporary scheme beyond compare.The mode of movement of mud from drier to the incinerator section in the external project, most of mode of movement that adopts sludge pump, sludge pump is carried or directly entered into to the mud of drier discharge end through belt, enter into incinerator through sludge pump again, the advantage of this mode is that mud is carried by pipeline, physical construction is few, and equipment failure rate is few.But the moisture percentage in sewage sludge that drier comes out is generally about 40%, be in the thickness district scope, stop up the common sludge pump easily, therefore must select the cost height for use, the import plunger pump that performance is excellent slightly, its cost of investment is more than the twice of other load transfer device, and the sludge pump mode of movement is only applicable to long distance and carries, and short range is carried uneconomical.
The utility model mud delivery system comprises band conveyor, bucket elevator, conveyor screw, and this system's convey materials is stable, satisfies technological requirement.It all is commercially available prod that this patent is mentioned each unit, standardization level height, applied range.
The utility model comprises band conveyor, bucket elevator, conveyor screw:
Sludge drier 1 mud mouth is positioned at the top of band conveyor 2;
Band conveyor 2 mud mouths are connected with the feeder hopper of mud bucket elevator 3;
The silo that is positioned at the mud bucket elevator 3 above the sludge incinerator 5 inlet point height links to each other with the conveyor screw 4 of sludge incinerator 5 entrance;
The mud mouth of conveyor screw 4 connects sludge incinerator 5;
Sludge incinerator 5 is connected with combustion engine 8 with waste heat boiler 6;
Scrubbing tower 7 passes through plumbing connection with sludge drier 1.
Embodiment 3
The utility model provides a kind of semi-dry sludge to be delivered to the complete carrying method of incinerator by drier, mainly comprises: the semi-dry sludge supplying step, and in order to the temperature safety that guarantees mud, the storage and the transportation of environmental protection.Promptly from the semi-dry sludge of drier output, at first deliver near the incinerator by band conveyor; Rise to incinerator inlet point height by bucket elevator then; By conveyor screw mud is sent into CIU at last, contains following steps:
(1) the semi-dry sludge water ratio by drier output is 30%～40%, by starting the dynamic action of band conveyor, relies on the friction force between semi-dry sludge and the load-transfer device, and semi-dry sludge is delivered near the incinerator bucket elevator continuously equably.
(2) bucket elevator is the bont of dewatered sludge, the semi-dry sludge that transports is risen in the dewatered sludge hopper of incinerator inlet point height.
(3) mud is sent into mud feed hopper in the CIU by feed hopper bottom equably by spiral conveyer, and mud is delivered to by the feed hopper bottom and carried out burning disposal in the incinerator.Conveyor screw is rotated in hopper by the turning cylinder with flight, makes the mud of packing in the hopper because self gravitation and to the effect of the friction force of hopper is only migrated forward along hopper, finishes the transportation work of sludge incineration.
The rack construction that also comprises band conveyor.Frame is idler pulley and the device that bears belt tension, and the frame form that adopts in the utility model is the triangular supports structure, has compact conformation, good rigidly, intensity advantages of higher.Simultaneously, applied widely, can satisfy bandwidth 500～1400mm, 0 °～18 ° at inclination angle, enclose the exemplary configurations of various ways such as 190 °～210 ° of cornerites, and can with the supporting use of funnel.
Also comprise the head funnel.The head funnel is positioned at the exit of drier, links to each other with the frame of band conveyor, and the head funnel is used for guide, control materials flow direction, also can play antisoiling effect simultaneously.
Also comprise the head swabbing pig.Swabbing pig is used to clean the material that adheres on the load-transfer device, because dewatered sludge just has very big viscosity, establishes the head swabbing pig in the conveyor head funnel.The head swabbing pig is arranged on the bottom of front end driving roller shaft, comes desilt by scraper plate, falls into the head funnel bottom of inlet point then, returns to conveyer afterwards in order to carry.
Funnel is a not belt material plate of coventional type in the utility model, and belt speed scope :≤2.5m/s is simultaneously according to the connection section between design funnel of the overlap height between the load transfer device and the deflector chute.
Sweeper head is loaded on the discharge roll place, is weight scraper-type formula structure; Empty segment sweeper is contained in the non-working surface of the preceding inferior division load-transfer device of stern barrel, or the vertical heavy-hammer tension device enters the changed course cylinder place on limit.The head funnel is the belt material plate not, connects funnel and deflector chute.
The technical goal and the parameter that also comprise various conveying equipments.Band conveyor: bandwidth 500mm, long 6.5m; Maximum transmission capacity: 4.2t/h; Bucket elevator: loop chain type, fed distance: 12m; Maximum transmission capacity: 4.2t/h; Conveyor screw: DWG, fed distance: 3m; Traffic capacity: 1.7t/h.
As mentioned above, embodiment of the present utility model is explained, but as long as not breaking away from inventive point of the present utility model and effect in fact can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within the protection domain of the present utility model.
Claims (6)
1. semi-dry sludge feedway is characterized in that:
The sludge drier mud mouth is positioned at the top of band conveyor;
The band conveyor mud mouth is connected with the feeder hopper of mud bucket elevator;
The silo that is positioned at the mud bucket elevator above the sludge incinerator inlet point height links to each other with the conveyor screw of sludge incinerator entrance;
The mud mouth of conveyor screw connects sludge incinerator;
Sludge incinerator is connected with combustion engine with waste heat boiler;
Scrubbing tower and sludge drier pass through plumbing connection.
2. a kind of semi-dry sludge feedway according to claim 1, the rack construction that it is characterized in that band conveyor is idler pulley and the device that bears belt tension, rack construction is the triangular supports structure.
3. a kind of semi-dry sludge feedway according to claim 1 is characterized in that sweeper head is loaded on the discharge roll place, is weight scraper-type formula structure; Empty segment sweeper is contained in the non-working surface of the preceding inferior division load-transfer device of stern barrel, or the vertical heavy-hammer tension device enters the changed course cylinder place on limit.
4. a kind of semi-dry sludge feedway according to claim 1 is characterized in that not belt material plate of head funnel, connects funnel and deflector chute.
5. a kind of semi-dry sludge feedway according to claim 1 is characterized in that the head funnel is positioned at the exit of drier, links to each other with the frame of band conveyor.
6. a kind of semi-dry sludge feedway according to claim 1 is characterized in that establishing the head swabbing pig in the conveyor head funnel, and the head swabbing pig is arranged on the bottom of front end driving roller shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206411264U CN201901421U (en) | 2010-11-29 | 2010-11-29 | Semidry sludge conveying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206411264U CN201901421U (en) | 2010-11-29 | 2010-11-29 | Semidry sludge conveying device |
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| Publication Number | Publication Date |
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| CN201901421U true CN201901421U (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206411264U Expired - Lifetime CN201901421U (en) | 2010-11-29 | 2010-11-29 | Semidry sludge conveying device |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070006A (en) * | 2010-11-29 | 2011-05-25 | 北京机电院高技术股份有限公司 | Half-dry sludge conveying device and method |
| CN104261040A (en) * | 2014-09-22 | 2015-01-07 | 北京机电院高技术股份有限公司 | Multi-channel half-dry sludge switching device and sludge conveying system comprising same |
| CN114893780A (en) * | 2022-06-14 | 2022-08-12 | 上海市政工程设计研究总院（集团）有限公司 | Combined feeding system for sludge incineration and sludge incineration method |
-
2010
- 2010-11-29 CN CN2010206411264U patent/CN201901421U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070006A (en) * | 2010-11-29 | 2011-05-25 | 北京机电院高技术股份有限公司 | Half-dry sludge conveying device and method |
| CN102070006B (en) * | 2010-11-29 | 2013-07-03 | 北京机电院高技术股份有限公司 | Half-dry sludge conveying device and method |
| CN104261040A (en) * | 2014-09-22 | 2015-01-07 | 北京机电院高技术股份有限公司 | Multi-channel half-dry sludge switching device and sludge conveying system comprising same |
| CN114893780A (en) * | 2022-06-14 | 2022-08-12 | 上海市政工程设计研究总院（集团）有限公司 | Combined feeding system for sludge incineration and sludge incineration method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Jiang Zili Inventor after: Liu Yong Inventor after: Liu Xu Inventor after: Chen Xulian Inventor after: Zhao Chuanjun Inventor after: Liu Li Inventor after: Shen Weizhen Inventor after: Li Zongxuan Inventor after: Yu Shufen Inventor after: Mu Hongyan Inventor after: Gao Guangyu Inventor after: Xu Xinghua Inventor before: Zhao Chuanjun Inventor before: Chen Xulian Inventor before: Jiang Zili Inventor before: Meng Dawei Inventor before: Shen Weizhen Inventor before: Mu Hongyan Inventor before: Gao Guangyu Inventor before: Xu Xinghua Inventor before: Liu Yong Inventor before: Liu Xu |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHAO ZHUANJUN JIANG ZILI MENG DAWEI SHEN WEIZHEN MU HONGYAN GAO GUANGYU XU XINGHUA LIU YONG LIU XU CHEN XULUAN TO: JIANG ZILI ZHAO ZHUANJUN LIU LI SHEN WEIZHEN LI ZONGXUAN YU SHUFEN MU HONGYAN GAO GUANGYU XU XINGHUA LIU YONG LIU XU CHEN XULUAN |
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| C56 | Change in the name or address of the patentee |
Owner name: BMEI CO., LTD. Free format text: FORMER NAME: HIGH TECHNOLOGIES CO., LTD., BEIJING ELECTROMECHANICAL ACADEMY |
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| CP01 | Change in the name or title of a patent holder |
Address after: 100027 Beijing city Chaoyang District Gongti North Road No. 4 Patentee after: BMEI CO., LTD. Address before: 100027 Beijing city Chaoyang District Gongti North Road No. 4 Patentee before: High Technologies Co., Ltd., Beijing Electromechanical Academy |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110720 |