CN204159341U - The board-like bubble tower of fine ga(u)ge screen - Google Patents
The board-like bubble tower of fine ga(u)ge screen Download PDFInfo
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- CN204159341U CN204159341U CN201420567816.8U CN201420567816U CN204159341U CN 204159341 U CN204159341 U CN 204159341U CN 201420567816 U CN201420567816 U CN 201420567816U CN 204159341 U CN204159341 U CN 204159341U
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Abstract
The utility model belongs to the gas-liquid mass transfer (contact) equipment in chemical industry and green technology territory, is applied to the technical process such as distillation, absorption, separation, washing, purification.A kind of fine ga(u)ge screen plate bubble tower, comprises cylindrical shell, air inlet, gas outlet, microchannel pore sieve plate, imbibition gas-permeable nets and liquid reducing device.Liquid phase is transported to imbibition gas-permeable nets, is carried secretly by the gas entering bubble tower, forms gas-liquid mixture and through after the microchannel pore of described column plate, above column plate, forms bubble level.Fine ga(u)ge screen plate bubble tower adopts micro channel sieve plate and imbibition to breathe freely feed liquid way under web plate, forms biphase gas and liquid flow through micro channel, significantly increases gas liquid interfacial area, enhance mass transport process.The utility model structure is simple, stable operation, be convenient to safeguard, the pressure loss is little, consumption liquid measure is little, equipment investment and operation energy consumption low.
Description
Technical field
The present invention relates to a kind of bubble tower, belong to the gas-liquid mass transfer (contact) equipment of chemical industry and environmental technology field, the technical process such as the distillation of the industries such as chemical industry, environmental protection, smelting, light industry, absorption, separation, washing, purification can be widely used in.
Background technology
Absorption tower is purifier and the technique of volatile contaminant in the important process gas of a class and dust, typically can be divided into spray column (spray tower), packed column, plate column and JBR tower (Jet bubbling tower).According to the power resources of gas-liquid contact, absorption tower can be divided into the Liquid inject mode injected liquid in gas phase and gas injecting operations gas being ejected into liquid phase.In order to improve treatment effeciency, reduce investment and operating cost, the gas liquid contacting efficiency improved in absorption tower is a main research direction.
Common fountain process for purifying, is sprayed downwards by spray head, atomising head after relying on the power of water pump water extraction to be risen, or is sprayed at and baffle plate forms cascade flows down, and air flows from bottom to top, with liquid phase counter current contacting under blower fan suction.Operating condition is gas flow rate 0.5 ~ 2m/s, water consumption 0.5 ~ 1.5L/m3, the pressure loss 100 ~ 500Pa, and its structure is simple, and resistance is little, but equipment is huge, and water consumption is large, and efficiency of dust collection is lower.Another kind of auto-excitation type process for purifying, after rocket motor impacts the water surface downwards, evokes a large amount of sprays by the throttling of S shape passage, due to the collision between grit and drop, interception and cohesion, dusty gas is purified.Operating condition is gas flow rate 10 ~ 20m/s, water consumption 0.05 ~ 0.1L/m3, the pressure loss 1000 ~ 1500Pa, and efficiency of dust collection can reach 95%, its compact conformation, and floor space is little, and load adaptability is good, and water consumption is few, but the pressure loss is very large.
Plate column is common bubbling type washer, a large amount of pore air feed that column plate distributes passes through mutually, the bubble level of gas-liquid contact on column plate carries out, liquid phase is sprayed downwards from tower top by water pump pumps, air-flow is through forming a large amount of bubble during liquid layer and constantly breaking and upgrade, in bubbling area by under dust catching, the normal multilayer column plate that adopts is to improve purification efficiency.Operating condition is gas flow rate 1 ~ 3m/s, water consumption 0.1 ~ 0.3 L/m3, the pressure loss 300 ~ 1000Pa.Plate column is divided into aperture sieve plate (3 ~ 8mm) and macroporous plate (10 ~ 25mm) by aperture.Aperture sieve plate easily blocks, and is not suitable for processing feed liquid that is dirty, tough and band solids; Macroporous plate is easy-to-leak liquid then, and the operating pressure of requirement is high, and mass-transfer efficiency is also lower.Sieve-plate tower has taken into account processing flux, purifying property and operation energy consumption preferably, but its structure compared with complicated, operating flexibility is little, installation requirement is high.
The operation principle on JBR formula absorption tower is, processed gas is imported by playpipe in the enclosure space be made up of upper and lower plate and forms gas-bearing formation, from liquid, bubbling rises, after gas dispersion plate or rectification tedge, the liquid that gas is carried secretly forms one and constantly forms by a large amount of the continuous print bubble level formed with broken bubble on plate top.Due to the MULTI CONTACT between gas-liquid and huge contact area, the mass transfer rate on JBR formula absorption tower is very high, effectively can absorb and remove contained volatile contaminant in gas, and the fine particles such as dust is also removed after contact liquid film.Its typical apply as Japanese thousand generation field chemical company C-T121 bubbling absorption column sulfur removal technology, United States Patent (USP) " Gas sparging method (US 4368060) ", Chinese patent " method and apparatus (CN90104117) of the waste gas of process containing dust and chemical pollutant ", " using gas multiple sieve plate to be used for the method and apparatus (CN1086597C) of flue gas wet desulfurizing ".
Because JBR tower relies on gas pressure to form bubble level, the requirement for horizontality for gas dispersion plate is very high.Even if there is the inclination of several millimeters in the installation of gas dispersion plate, just mean that the zones of different of gas dispersion plate exists the pressure reduction of a few millimeter of water, steam vent from the low region of liquid level passes through by gas, and gas-liquid cycle also from fumarole leakage and then may be destroyed in the high region of liquid level.But, in prior art, gas injection tube passes into gas-bearing formation district through gas dispersion plate above absorption tower, gas dispersion plate not only complex structure, manufacture, install and keep in repair all very difficult, and mutually support fastening with other parts, levelness cannot be adjusted in site of deployment, will operation and the treatment effeciency of JBR tower be had a strong impact on.And then, processed gas imports below gas dispersion plate from playpipe, impact liquid level entrained liquids rise through after spray-hole, uneven in the liquid carry over of radial diverse location, it is larger that gas the closer to playpipe region rushes liquid carry over, it is less that gas away from playpipe region rushes liquid carry over, reduces gas liquid contacting efficiency.Secondly, playpipe through gas dispersion plate, makes the space efficiency utilization above absorption tower low, increases volume and the cost of equipment above absorption tower.
The sieve-board type bubble tower of prior art is generally gas-liquid counter current operation, and liquid distributor is located at top, and liquid sprays the column plate of the top downwards, the overflow of block-by-block column plate and under.The bubble level of gas-liquid contact only on column plate carries out, and substantially gas-liquid contact and mass transfer do not occur in the sieve aperture of column plate, aperture is generally 3 ~ 25mm.The technical scheme that the present embodiment provides, sieve plate 6 forms by having certain thickness micro channel, and sparge pipe 5 is located at the below of column plate, and the drop of injection is carried secretly by gas from bottom to top, following current through after the micro channel of sieve plate 6, then forms bubble level 12 above sieve plate 6.Biphase gas and liquid flow mainly passes through with micro air bubble form through during micro channel, and the bubble level above column plate forms a large amount of bubble constantly break and upgrade further, thus has very large contact area and very high mass transfer efficiency.Although the aperture of each micro channel is very little, because pitch of holes is very little, on the contrary higher than the column plate of prior art, the pressure drop of whole column plate is not high for percent opening (on sieve plate the gross area of sieve aperture and the ratio of aperture area area).
Auxiliary liquid inlet device 11 is provided at the liquid phase spray thrower of top stating cylindrical shell top, sieve plate 6, can improve the liquid-gas ratio of bubble tower, can reduce the pressure loss, reduce energy consumption.
With prior art gas with continuous phase by compared with the sieve aperture of column plate, in the present invention, a large amount of bubble is by sieve aperture, and what continue sieve aperture with high flow velocities washes away, and it is dirty stifled to be not easy to produce fouling.
The board-like bubble tower of the fine ga(u)ge screen that the present embodiment provides, structure is simple, stable, manufactures, debugging and easy to maintenance; Water consumption 0.1 ~ 0.3L/m3, the pressure loss 200 ~ 500Pa, gas liquid contacting efficiency is very high.
Summary of the invention
Therefore, the present invention is for solving the problem and proposing, its objective is and provide a kind of novel fine ga(u)ge screen board-like bubble tower, gas liquid contacting efficiency can be enlarged markedly, improve reaction speed or the purification efficiency of bubble tower, the pressure drop of reduction system and energy consumption, its structure is simple, stable operation, be convenient to safeguard.
The technical scheme that the present invention takes is the board-like bubble tower of a kind of fine ga(u)ge screen, comprises cylindrical shell, air inlet, gas outlet, at least one deck column plate and liquid reducing device.Air inlet is arranged on the position of more than cylindrical shell bottom, liquid level; Gas outlet is arranged on the position of more than cylindrical shell top, column plate bubble level.Vapor distributor communicates with air inlet, and air inlet is uniformly distributed in the radial direction of cylindrical shell; Vapor distributor can not be established when cylindrical shell sectional area is less.
Especially, described column plate is pore sieve plate, also honeycomb screen cloth is claimed, by sheet metal or ceramic fiber sheet molding or sheet metal punch forming or injection mo(u)lding, it is the screen cloth that there is certain altitude, spread all over micro channel, its structural parameters are height 3 ~ 30mm, average pore size 0.5 ~ 5mm, and percent opening is 0.3 ~ 0.9.Further, the preferred structure parameter of pore sieve plate is height 10 ~ 20mm, average pore size 1 ~ 3mm, and percent opening is 0.5 ~ 0.8.According to Chinese Engineering Standardization association criterion CECS97:97, gas produces by porous media the gas diffuser that diameter is greater than 3mm bubble in the liquid phase and is called middle macropore diffuser, produces the efficient gas disperser that diameter is less than 3mm bubble in the liquid phase and is called microporous diffuser.The bubble diameter that the micro channel of pore screen cloth produces is little, substantially increases gas liquid interfacial area, enhances mass transport process.
Described liquid reducing device is at least one downspout, or is located at the overflow launder at described sieve plate edge, to control the liquid level of bubble level.Liquid reducing device upper end open establishes V-type teeth groove, and the difference in height between tooth groove root and column plate is called overflow height.
Especially, imbibition gas-permeable nets is provided with below described column plate.Imbibition gas-permeable nets is made up of the foam metal material having multiple through hole, or is made up of the hygroscopic fibre material having multiple through hole, or accompanies the bilayer of absorbent material by centre or multi-layer silk screen is made, and its percent opening is large, and gas phase drag is not high.The drop of liquid phase distributor ejection or the overflow liquid of bubble level or the drop that leaked down by column plate are transported to described imbibition gas-permeable nets, absorbed and store by imbibition gas-permeable nets.The distance of imbibition gas-permeable nets and described column plate is 0 ~ 100mm, and preferential distance is 5 ~ 20mm.
Further, described liquid phase distributor is located between column plate and imbibition gas-permeable nets.Liquid phase distributor produces fine droplets, is ejected on described imbibition gas-permeable nets, or injects liquid into the position bottom column plate, and liquid is entered the microchannel pore of column plate by airflow entrainment from bottom to top.
Further, described fine ga(u)ge screen plate bubble tower is provided with two-layer or multilayer column plate.The aperture of upper strata column plate is less than or equal to the aperture of descending trays, can more efficiently remove fine droplet or particle when washing, absorption.The overflow height of upper strata column plate is less than or equal to the overflow height of descending trays, is conducive to the pressure loss, the reduction system energy consumption that reduce bubble tower.
Further, above described cylindrical shell top, column plate, be provided with the downward hydrojet of auxiliary liquid phase partitioning device, to improve the liquid-gas ratio of bubble tower, the pressure loss can be reduced, reduce energy consumption.
Liquid phase is transported to described imbibition gas-permeable nets, is carried secretly by the gas entering bubble tower from described air inlet, forms gas-liquid mixture and through after the microchannel pore of described column plate, above column plate, forms bubble level.
The board-like bubble tower of described fine ga(u)ge screen, gas enters in bubble tower from air inlet, through vapor distributor current stabilization; Liquid is ejected into imbibition gas-permeable nets by liquid phase distributor; Liquid in imbibition gas-permeable nets, when imbibition gas-permeable nets, is taken out of by gas flow, forms the micro channel of gas-liquid mixture through pore sieve plate, produces a large amount of bubble and constantly break and coalescence above column plate, form bubble level.Liquid phase flows to below after the teeth groove of liquid reducing device overflows, and gas phase upwards flows under fan action, until discharge bubble tower from gas outlet.
Biphase gas and liquid flow mainly passes through with micro air bubble form through during micro channel, thus has very large contact area and very high mass transfer efficiency; Further, the bubble level of gas-liquid two-phase above column plate forms a large amount of bubble and constantly breaks and upgrade, and enhances mass transport process.
Fine ga(u)ge screen provided by the invention board-like bubble tower structure is simple, mass-transfer efficiency is high, and be applicable to gas liquid reaction and absorption, washing, purifying, advantage is compared with prior art:
1, adopt micro channel sieve plate and imbibition gas-permeable nets feed flow, form biphase gas and liquid flow through micro channel, the bubble diameter of generation is little, significantly increases gas liquid interfacial area, enhances mass transport process;
2, a large amount of bubble carries out continuous erosion to sieve aperture at a high speed, and it is dirty stifled to be not easy to produce fouling;
3, the pressure loss little, consumption liquid measure little, equipment investment and operation energy consumption low.
Accompanying drawing explanation
Fig. 1 is the schematic cross sectional view of the individual layer fine ga(u)ge screen plate bubble tower of embodiment 1.
Fig. 2 is the pore sieve plate cross section view of embodiment 1.
Fig. 3 is the schematic cross sectional view of the multilayer fine ga(u)ge screen plate bubble tower of embodiment 2.
Symbol description:
1, cylindrical shell, 2, air inlet, 3, gas outlet, 5, sparge pipe, 6, sieve plate, 7, overflow plate, 8, imbibition gas-permeable nets, 9, demister, 10 liquid-phase outlets, 11, auxiliary liquid inlet device, 12, bubble level
Detailed description of the invention
The explanation of reference accompanying drawing and following embodiment, is appreciated that object of the present invention, feature and effect.
Embodiment 1:
The board-like bubble tower of fine ga(u)ge screen as shown in Figure 1, comprises cylindrical shell 1, air inlet 2, gas outlet 3, sparge pipe 5, sieve plate 6, overflow plate 7, imbibition gas-permeable nets 8, auxiliary liquid inlet device 11 and demister 9.Air inlet 2 is arranged on the position of more than cylindrical shell bottom, liquid level; Gas outlet 3 is arranged on the position of more than cylindrical shell top, column plate bubble level.
The bubble tower column plate of the present embodiment is pore sieve plate 6, by sheet metal or ceramic fiber sheet molding or sheet metal punch forming or injection mo(u)lding, it is the screen cloth that there is certain altitude, spread all over micro channel, its structural parameters are height 3 ~ 30mm, average pore size 0.5 ~ 5mm, percent opening 0.3 ~ 0.9.The side of sieve plate 6 is provided with overflow plate 7, and overflow plate upper end has many V-notch, higher than sieve plate 10 ~ 50mm.
The below of sieve plate 6 is provided with imbibition gas-permeable nets 8, and imbibition gas-permeable nets 8 is 0 ~ 100mm with the distance of sieve plate 6, and preferential distance is 5 ~ 20mm.Imbibition gas-permeable nets 8 is made up of the foam metal material having multiple through hole, or is made up of the hygroscopic fibre material having multiple through hole, or accompanies the bilayer of absorbent material by centre or multi-layer silk screen is made.Its percent opening is large, and gas phase drag is little.Liquid phase is transported to imbibition gas-permeable nets 8: pump, by the lifting liquid of cylinder body bottom, sprays on imbibition gas-permeable nets 8 by sparge pipe 5; The leakage in the hole of sieve plate 6, also flows to imbibition gas-permeable nets 8.The liquid of imbibition gas-permeable nets 8 is carried secretly by the gas entering bubble tower from air inlet 2, forms gas-liquid mixture and through after the microchannel pore of described sieve plate 6, forms bubble level 12 above sieve plate 6.
Sparge pipe 5 is the liquid phase distributors be located between sieve plate 6 and imbibition gas-permeable nets 8, liquid is sprayed onto the bottom of sieve plate 6.Regulate the diameter of liquid droplets and jetting height, make drop be ejected into position bottom sieve plate 6, flowed through screen cloth 6 by airflow entrainment from bottom to top.Spray feed liquid way under this plate, compared with the flush water bath type dust remover of prior art, air velocity and gas phase drag little many, significantly reduce the energy consumption of blower fan.Above cylindrical shell top, column plate, be provided with auxiliary feed tube 11 hydrojet downwards, to improve the liquid-gas ratio of bubble tower, the pressure loss can be reduced, reduce energy consumption.
The fine droplets that sparge pipe 5 sprays, with the gas entered in tower forms gas-fluid two-phase mixture from air inlet 2, upwards flows and passes sieve plate 6, and form bubble level 12 above sieve plate 6.Liquid phase flows back to downwards at the bottom of tower after overflowing from the upper edge of the overflow plate 7 of sieve plate 6 side; Gas phase upwards discharges bubble tower from gas outlet 3.
Embodiment 2:
The board-like bubble tower of fine ga(u)ge screen shown in Fig. 3 is the bubble tower with multilayer pore sieve plate.Comprise cylindrical shell 1, air inlet 2, gas outlet 3, sparge pipe 5, sieve plate 6, overflow plate 7, imbibition gas-permeable nets 8, auxiliary feed tube 11 and demister 9.Air inlet 2 is arranged on the position of more than cylindrical shell bottom, liquid level; Gas outlet 3 is arranged on the position of more than cylindrical shell top, column plate bubble level.
The bubble tower column plate of the present embodiment is microchannel pore sieve plate 6, is the screen cloth having certain altitude, spread all over micro channel, and preferred structural parameters are height 10 ~ 20mm, average pore size 1 ~ 3mm, and percent opening is 0.6 ~ 0.8.The side of sieve plate 6 is provided with overflow plate 7, and overflow plate upper end has many V-notch.
The below of sieve plate 6 is provided with imbibition gas-permeable nets 8, and imbibition gas-permeable nets 8 is 5 ~ 20mm with the preferred distance of sieve plate 6.Imbibition gas-permeable nets 8 accompanies the bilayer of absorbent material by centre or multi-layer silk screen is made, and gas phase drag is little.The overflow launder that overflow plate 7 is formed, the overflow liquid of bubble level 12 above column plate, flows to from liquid reducing device or is seeped into imbibition gas-permeable nets 8; The liquid of imbibition gas-permeable nets 8 is carried secretly by the gas entering bubble tower from air inlet 2, forms gas-liquid mixture also through the microchannel pore of sieve plate 6.
Between sieve plate 6 and imbibition gas-permeable nets 8, be provided with sparge pipe 5, pump, by the lifting liquid of cylinder body bottom, sprays on imbibition gas-permeable nets 8 by sparge pipe 5, is also carried secretly by gas and passes sieve plate 6.
Gas-liquid mixture also through after the microchannel pore of sieve plate 6, forms bubble level above sieve plate 6.
The aperture of upper strata column plate is less than or equal to the aperture of descending trays, can more efficiently remove fine droplet or particle when washing, absorption.The overflow height of upper strata column plate is less than or equal to the overflow height of descending trays, is conducive to the pressure loss, the reduction system energy consumption that reduce bubble tower.
Claims (10)
1. a fine ga(u)ge screen plate bubble tower, comprise cylindrical shell, air inlet, gas outlet, at least one deck column plate and liquid reducing device, described column plate is microchannel pore sieve plate, imbibition gas-permeable nets is provided with below described column plate, it is characterized in that: liquid phase is transported to described imbibition gas-permeable nets, carried secretly by the gas entering bubble tower from described air inlet, form gas-liquid mixture and through after the microchannel pore of described column plate, above column plate, form bubble level.
2. fine ga(u)ge screen plate bubble tower according to claim 1, is characterized in that: by one or more modes following, liquid phase is transported to imbibition gas-permeable nets: 1) pump is by the lifting liquid of cylinder body bottom, and spray is to imbibition gas-permeable nets; 2) overflow liquid of bubble level above column plate, flows to from liquid reducing device or is seeped into imbibition gas-permeable nets; 3) leakage in the hole of column plate, flows to imbibition gas-permeable nets.
3. fine ga(u)ge screen plate bubble tower according to claim 1, is characterized in that: the structural parameters of described microchannel pore sieve plate are height 3 ~ 30mm, average pore size 0.5 ~ 5mm, percent opening 0.3 ~ 0.9.
4. fine ga(u)ge screen plate bubble tower according to claim 1, is characterized in that: the preferred structure parameter of described microchannel pore sieve plate is height 10 ~ 20mm, average pore size 1 ~ 3mm, and percent opening is 0.6 ~ 0.8.
5. fine ga(u)ge screen plate bubble tower according to claim 1, it is characterized in that: described imbibition gas-permeable nets is made up of the foam metal material having multiple through hole, or be made up of the hygroscopic fibre material having multiple through hole, or accompany the bilayer of absorbent material by centre or multi-layer silk screen is made.
6. fine ga(u)ge screen plate bubble tower according to claim 1, is characterized in that: the distance of described imbibition gas-permeable nets and described column plate is 0 ~ 100mm.
7. fine ga(u)ge screen plate bubble tower according to claim 1, is characterized in that: the preferential distance of described imbibition gas-permeable nets and described column plate is 5 ~ 20mm.
8. fine ga(u)ge screen plate bubble tower according to claim 1, is characterized in that: between described column plate and described imbibition gas-permeable nets, be provided with liquid phase distributor, is sprayed onto by liquid on described imbibition gas-permeable nets, or liquid is sprayed onto the bottom of described column plate.
9. fine ga(u)ge screen plate bubble tower according to claim 1, is characterized in that: above described cylindrical shell top, column plate, be also provided with liquid phase spray thrower.
10. fine ga(u)ge screen plate bubble tower according to claim 1 is provided with two-layer or multilayer column plate, it is characterized in that: the aperture of upper strata column plate is less than or equal to the aperture of descending trays, and the overflow height of upper strata column plate is less than or equal to the overflow height of descending trays.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420567816.8U CN204159341U (en) | 2014-09-26 | 2014-09-26 | The board-like bubble tower of fine ga(u)ge screen |
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| CN201420567816.8U CN204159341U (en) | 2014-09-26 | 2014-09-26 | The board-like bubble tower of fine ga(u)ge screen |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324587A (en) * | 2014-09-26 | 2015-02-04 | 常州友达环保科技有限公司 | Thin-hole sieve-plate-typed bubble column |
| CN105890057A (en) * | 2016-05-10 | 2016-08-24 | 上海晶顿科技有限公司 | Multi-phase exchange purification treatment module |
| CN106268520A (en) * | 2016-09-12 | 2017-01-04 | 西南石油大学 | Gas hydrates synthesis Wobble plate type reactor system |
| CN108295588A (en) * | 2018-04-10 | 2018-07-20 | 北京英华高科技有限公司 | A kind of new gas dust separation device |
| CN108344043A (en) * | 2018-02-07 | 2018-07-31 | 沈新富 | A kind of air cleaning system |
| CN115400530A (en) * | 2022-09-21 | 2022-11-29 | 江苏瑞一量子研究院有限公司 | A clean system for gas |
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2014
- 2014-09-26 CN CN201420567816.8U patent/CN204159341U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324587A (en) * | 2014-09-26 | 2015-02-04 | 常州友达环保科技有限公司 | Thin-hole sieve-plate-typed bubble column |
| CN105890057A (en) * | 2016-05-10 | 2016-08-24 | 上海晶顿科技有限公司 | Multi-phase exchange purification treatment module |
| CN106268520A (en) * | 2016-09-12 | 2017-01-04 | 西南石油大学 | Gas hydrates synthesis Wobble plate type reactor system |
| CN106268520B (en) * | 2016-09-12 | 2018-10-19 | 西南石油大学 | Gas hydrates synthesize Wobble plate type reaction kettle system |
| CN108344043A (en) * | 2018-02-07 | 2018-07-31 | 沈新富 | A kind of air cleaning system |
| CN108295588A (en) * | 2018-04-10 | 2018-07-20 | 北京英华高科技有限公司 | A kind of new gas dust separation device |
| CN115400530A (en) * | 2022-09-21 | 2022-11-29 | 江苏瑞一量子研究院有限公司 | A clean system for gas |
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Granted publication date: 20150218 Termination date: 20170926 |