CN103666506A - Feed coal pre-pyrolysis device for large-sized pulverized coal furnace - Google Patents

Feed coal pre-pyrolysis device for large-sized pulverized coal furnace Download PDF

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Publication number
CN103666506A
CN103666506A CN201310684528.0A CN201310684528A CN103666506A CN 103666506 A CN103666506 A CN 103666506A CN 201310684528 A CN201310684528 A CN 201310684528A CN 103666506 A CN103666506 A CN 103666506A
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coal
steam
gas
pyrolysis
feed
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CN201310684528.0A
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Inventor
王五一
李炳熙
金鲁田
许振华
姚锋
姜森
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BEIJING LANTIAN LIYUAN SCIENCE AND TECHNOLOGY Co Ltd
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BEIJING LANTIAN LIYUAN SCIENCE AND TECHNOLOGY Co Ltd
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Priority to CN201310684528.0A priority Critical patent/CN103666506A/en
Publication of CN103666506A publication Critical patent/CN103666506A/en
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Abstract

The invention discloses a feed coal pre-pyrolysis device for a large-sized pulverized coal furnace. The device comprises a feed coal bucket, rectangular star-like unloading machines, a steam fluidized bed dryer, a screw coal feeder, a combined coal pyrolysis device, a semi-coke conveying heat exchanger and a coal mill, which are sequentially connected, wherein a fluidized steam air distribution plate is arranged at the lower part of the steam fluidized bed dryer, and a secondary steam outlet is formed in the upper part of the steam fluidized bed dryer, and is connected with a secondary steam recovery system through an electrical dust precipitator; a fluidized gas air distribution plate is arranged at the lower part of the combined coal pyrolysis device; an internal separator is arranged atthe inner middle part of the combined coal pyrolysis device, and is a multi-inlet cyclone separator; a gas outlet in the top of the internal separator is connected with the fluidized gas air distribution plate after the heat exchange of hot flue gas between a high-temperature heat pipe heat exchanger and a gas fired furnace. According to the device, a heat, electricity, oil and gas co-production system can be implemented, so that not only are the classified utilization of coal and the gradient utilization of heat energy realized to facilitate energy saving and emission reduction, but also the economic benefits of a thermoelectricity enterprise can be improved.

Description

The preposition pyrolysis installation of feed coal for large coal fired boilers
Technical field
The present invention relates to a kind of pyrolysis of coal device, particularly a kind of preposition pyrolysis installation of feed coal for large coal fired boilers.
Background technology
At present, heat, electricity, oil, coal gas Poly-generation engineering for big and medium-sized cities and comprehensive Coal Chemical Industry production garden, can make it in power generation and heat supply, output coal gas, tar and other chemical by-products.In this technique, need to use pyrolysis of coal device.
Denomination of invention is the Chinese patent ZL94119045.5 of the technology and equipment of the preposition coal gas generation of boiler, technique for the preposition coal gas generation of boiler of electricity, heat and coal gas three coproduction is disclosed, coal and hot ash mix and the part thermo-cracking of coal is carried out on the top of thermal cracker and Gas Flow gasifying device, the continuation thermo-cracking of coal is carried out in the bottom of thermal cracker and Gas Flow gasifying device, with reach first hot lysate first discharge with rear hot lysate after discharge.Its equipment mainly comprises circular fluid bed, thermal cracker (dry distiller), divider, Gas Flow gasifying device and automatic control system etc.This invention has the coal of making and hot ash and mixes with thermo-cracking fully, improves gas yield and ensures the quality of products stable; Coal suitability is broad; Free from environmental pollution; With computer, monitor and control, realize the advantage of Automation of Manufacturing Process.
In prior art, in order to adapt to current circular fluid bed constantly to the trend of large scale development, the Chinese patent ZL200820122600.5 that to disclose denomination of invention be the side gazogene for big-and-middle-sized circular fluid bed improves said apparatus; For reduce above-mentioned gazogene floor space, reduce equipment manufacturing cost, denomination of invention is improved again said apparatus for the Chinese patent ZL201220098664.2 for the combined gazogene of circular fluid bed.
At least there is following problem in above-mentioned prior art:
Above-mentioned improved gazogene can not adapt at present widely used Poly-generation big-and-middle-sized, high-parameters coal-powder boiler and apply; Prior art equipment complex structure, equipment manufacturing cost is high.
Summary of the invention
The object of this invention is to provide a kind of simple in structure, running cost is low, it is low to pollute, be applicable to high moisture, the preposition pyrolysis installation of feed coal for large coal fired boilers of low-disintegration coal kind.
To achieve these goals, the technical solution used in the present invention is:
The preposition pyrolysis installation of feed coal for large coal fired boilers of the present invention, comprise raw material coal bunker, the feed opening of described raw material coal bunker bottom is connected with the opening for feed at steam fluidized bed dryer top by rectangular star-like unloading machine, the discharge port of described steam fluidized bed dryer bottom is connected with the opening for feed at combined pyrolysis of coal device middle part by screw-type coal distributor, and the discharge port of described combined pyrolysis of coal bottom of device is connected with coal pulverizer by semicoke delivery heat transfer device;
The bottom of described steam fluidized bed dryer is provided with fluidization steam vapor air distribution plate, described fluidization steam vapor air distribution plate is connected with vapour line, the top of described steam fluidized bed dryer is provided with secondary steam outlet, described secondary steam outlet is connected with secondary steam recovery system by electric precipitator, and the steam outlet of described secondary steam recovery system is connected with described fluidization steam vapor air distribution plate;
Described combined pyrolysis of coal device bottom is provided with fluidisation coal gas air distribution plate, in described combined pyrolysis of coal device, middle part is provided with built-in splitter, described built-in splitter is many inlet cyclones, the aggregate bin top of described combined pyrolysis of coal bottom of device is located in the separating material outlet of described built-in splitter bottom, and the air outlet at described built-in splitter top is connected with described fluidisation coal gas air distribution plate by oil gas purification system, gas compressor, described semicoke delivery heat transfer device, high temperature heat pipe heat exchanger successively;
The hot exhanst gas outlet of gas fired furnace is connected with smoke induced draught fan by described high temperature heat pipe heat exchanger.
As seen from the above technical solution provided by the invention, the preposition pyrolysis installation of feed coal for large coal fired boilers of the present invention, owing to adopting, steam fluidized bed dryer, combined pyrolysis of coal device etc. are moisture to height, low-disintegration coal kind is dewatered and pyrolysis processing, can realize heat, electricity, oil, coal gas polygenerations systeme, not only realized coal grading utilization, the cascade utilization of heat energy, is conducive to energy-saving and emission-reduction, and can improve the economic benefit of Thermal Power Enterprises.
Accompanying drawing explanation
The structural representation of the preposition pyrolysis installation of feed coal for large coal fired boilers that Fig. 1 provides for the embodiment of the present invention.
In figure: 1-raw material coal bunker; 2-rectangular star unloading machine; 3-steam fluidized bed dryer; 4-fluidization steam vapor air distribution plate; 5-electric precipitator, 6-secondary steam recovery system; 7-combined pyrolysis of coal device; 8-screw-type coal distributor; 9-fluidisation coal gas air distribution plate; 10-gas fired furnace; 11-smoke induced draught fan; 12-high temperature heat pipe heat exchanger; 13-built-in splitter; 14-oil gas purification system; 15-gas compressor; 16-semicoke delivery heat transfer device; 17-coal pulverizer.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail.
The preposition pyrolysis installation of feed coal for large coal fired boilers of the present invention, its preferably embodiment be:
Comprise raw material coal bunker, the feed opening of described raw material coal bunker bottom is connected with the opening for feed at steam fluidized bed dryer top by rectangular star-like unloading machine, the discharge port of described steam fluidized bed dryer bottom is connected with the opening for feed at combined pyrolysis of coal device middle part by screw-type coal distributor, and the discharge port of described combined pyrolysis of coal bottom of device is connected with coal pulverizer by semicoke delivery heat transfer device;
The bottom of described steam fluidized bed dryer is provided with fluidization steam vapor air distribution plate, described fluidization steam vapor air distribution plate is connected with vapour line, the top of described steam fluidized bed dryer is provided with secondary steam outlet, described secondary steam outlet is connected with secondary steam recovery system by electric precipitator, and the steam outlet of described secondary steam recovery system is connected with described fluidization steam vapor air distribution plate;
Described combined pyrolysis of coal device bottom is provided with fluidisation coal gas air distribution plate, in described combined pyrolysis of coal device, middle part is provided with built-in splitter, described built-in splitter is many inlet cyclones, the aggregate bin top of described combined pyrolysis of coal bottom of device is located in the separating material outlet of described built-in splitter bottom, and the air outlet at described built-in splitter top is connected with described fluidisation coal gas air distribution plate by oil gas purification system, gas compressor, described semicoke delivery heat transfer device, high temperature heat pipe heat exchanger successively;
The hot exhanst gas outlet of gas fired furnace is connected with smoke induced draught fan by described high temperature heat pipe heat exchanger.
Described vapour line connects the low-grade vapour pipe of self-generating system.
The fuel gas inlet of described gas fired furnace connects the gas exit from described oil gas purification system.
The discharge port of described coal pulverizer is connected with Pulverized Fuel Boiler Furnace, and the dust mouth of described electric precipitator bottom is connected with the opening for feed of described coal pulverizer.
The present invention adopts that steam fluidized bed dryer, combined pyrolysis of coal device etc. are moisture to height, low-disintegration coal kind is dewatered and pyrolysis processing, and advantage is:
(1) Energy efficiency is high: because apparatus of the present invention and pulverized coal firing boiler heat power plant realize Poly-generation operation, described steam fluidized bed dryer fluidization steam vapor used directly adopts the low-grade steam after heat power plant's power generation system is done manual work, and has realized the cascade utilization of energy; And need not build again boiler house, save facility investment.
In apparatus of the present invention, adopted heat transfer efficiency high, compact construction, little high temperature heat pipe heat exchanger is damaged in fluid resistance, is conducive to improve system thermal efficiency, has reduced the consumption of fuel gas.The hot semicoke that described combined pyrolysis of coal device is discharged after described semicoke delivery heat transfer device is carried not only temperature reduce and adapted to the working conditions of described coal pulverizer, and the sensible heat that has reclaimed semicoke is conducive to energy-conservation.
(2) construction investment is low: described steam fluidized bed dryer and combined pyrolysis of coal device adopt fluidized-bed form, and its heat conduction efficiency is higher than other forms; Equipment volume is little, unit consumption of energy is little, floor space is few, need not build boiler house, cost saving again.
(3) environmental protection and economy: adopt non-pollution discharge in the moisture eliminator operational process that steam is medium; The secondary steam that described steam fluidized bed dryer is discharged after high-efficiency electric dust catcher filters, recoverable; Running cost is low.
(4) operating safety: adopt steam (rare gas element) as fluidizing medium by preferred arrangement power plant generating set, described steam fluidized bed dryer; The combustion gas that the required high temperature fluidized coal gas of described combined pyrolysis of coal device is carried by native system produces with heat-exchange system and does not have associated with heat and power system; Apparatus of the present invention adopt above measure, make it both meet power plant safety standard, meet again coal gas chemical industry standard, in service can presence of fire, explosion hazard.
Compact construction of the present invention, has reduced the height of described built-in splitter outlet conduit, is conducive to and being connected of follow-up equipment, and has reduced equipment manufacturing cost; Owing to adopting the coal gas cyclonic separator of many imports, dust-laden coal gas of high temperature is evenly entered from coal gas separator periphery, overcome single makeup of the imports form and caused air stream axle asymmetric, cause vortex core to depart from center, make to export the larger defect of tube short circuit stream.In addition, because the air motion entering in coal gas separator forms axially symmetric flow, the wearing and tearing in coal gas separator are greatly reduced, and separation efficiency is also improved; Solid particulate matter under described built-in splitter separation can be in its outlet at bottom be transmitted back to the dust collecting box of described combined pyrolysis of coal device of described Gas Flow gasifying device bottom and have avoided short circuit grey separated and saved the grey send-back device of the necessary separation of external separator and saved equipment manufacturing cost.The described built-in splitter that is arranged in pyrolysis installation middle part heats up when pyrolysis installation starts together with pyrolysis installation, does not almost have heat to rise poor, does not need to arrange loop expansion pipe, saves equipment manufacturing cost.
Specific embodiment:
As shown in Figure 1, comprise raw material coal bunker 1, feed coal enters steam fluidized bed dryer 3 through raw material coal bunker 1 through rectangular star unloading machine 2, in steam fluidized bed dryer 3, be provided with fluidization steam vapor air distribution plate 4, the low-grade steam that the fluidization steam vapor of steam fluidized bed dryer 3 interior use is discharged after coming self-generating system steam turbine to do manual work; The external electric precipitator 5 of secondary steam outlet pipe on steam fluidized bed dryer 3 tops, the secondary steam of process electric precipitator 5 dedustings enters secondary steam recovery system 6 and reclaims, recycles.
Through the feed coal that steam fluidized bed dryer 3 is dry, by the dumping device of its bottom, through screw-type coal distributor 8, send into combined pyrolysis of coal device 7 again; Dried feed coal is subject to coal gas of high temperature fluidisation, the concurrent heat-dissipating cracking of heating that fluidisation coal gas air distribution plate 9 is sent in combined pyrolysis of coal device 7; The raw gas of coal thermo-cracking output is sent into oil gas purification system 14 after the built-in splitter 13 on combined pyrolysis of coal device 7 tops is removed dust again, and raw gas is separated purified gas, tar and other Chemicals in oil gas purification system 14
A part for the purified gas of oil gas purification system output is drawn, after gas compressor 15 pressurizations, send in semicoke delivery heat transfer device 16 and carry out heat exchange intensification, make it become middle temperature coal gas; In this, warm coal gas is admitted to high temperature heat pipe heat exchanger 12 again and carries out after heat exchange is heated becoming coal gas of high temperature; This coal gas of high temperature is admitted to fluidisation coal gas air distribution plate 9 ejections that are loaded on combined pyrolysis of coal device 7 bottoms again, and coal grain is carried out to fluidisation.
The high-temperature medium that enters high temperature heat pipe heat exchanger 12 is that the portioned product purified gas of system produce is sent into the hot flue gas producing after gas fired furnace 10 burnings as fuel gas, and this hot flue gas enters atmosphere through high temperature heat pipe heat exchanger 12 heat exchange, cooling by smoke induced draught fan 11.
Entering the hot semicoke outlet that coal hot semicoke of output after pyrolysis in combined pyrolysis of coal device 7 is admitted to combined pyrolysis of coal device 7 bottoms discharges, be admitted to again semicoke delivery heat transfer device 16, hot semicoke is lowered the temperature by heat exchange simultaneously in the process of semicoke delivery heat transfer device 16 interior conveyings, finally be admitted in coal pulverizer 17, coal pulverizer 17 is worn into fine coal by semicoke and is sent into Pulverized Fuel Boiler Furnace again.
The coal that specific embodiment is applicable:
Low order coal in being applicable to, as brown coal, long-flame coal etc.; Feed coal ash oontent≤15~20%; To sulphur content no requirement (NR); The feed coal of total moisture content < 50% can directly enter the preposition pyrolysis installation of described feed coal.
The operating parameter of the preposition pyrolysis installation of feed coal of the coal-powder boiler that specific embodiment provides:
(1) feed coal precrushing granularity: 0~5mm.
(2) required fluidization steam vapor parameter (air distribution plate ingress): 30kPa/150~200 ℃.
(3) total moisture content of dry rear coal :≤5~8%
(4) pyrolysis temperature of feed coal in combined pyrolysis of coal device 7: 420~460 ℃.
(5) the required fluidisation gas parameters of pyrolysis (air distribution plate ingress): 50kPa/700~750 ℃.
The product index of the preposition pyrolysis installation of feed coal of the coal-powder boiler that specific embodiment provides:
(1) in output semicoke, remain volatile content (V daf) :≤10~15% (depending on coal).
(2) net calorific value of output semicoke: >=22.0~26.0MJ/kg (depending on coal).
(3) net calorific value of output coal gas:>=17.6~23.0MJ/Nm 3(depending on coal).
(4) gas yield of unit mass (after dry) coal: 70~85Nm 3/ t coal (depending on coal).
(5) tar yield of unit mass (after dry) coal: 50~105kg/t coal (depending on coal).
Concrete application example:
Take with domestic 350MW overcritical extraction condensing type thermoelectricity Steam Turbine and the 1110t/h level supercritical DC pulverized coal firing boiler supporting with it is example.The original design scheme of above-mentioned every pulverized coal firing boiler is for being provided with altogether 5 covers feed coal bucket 1 similar to Figure 1 and coal pulverizer 17.So, for the pulverized coal firing boiler of above-mentioned model, can apply the device of the same embodiment of the present invention of 5 covers.Should only with 1 cover said apparatus, describe by use-case:
In this application example, the polygenerations systeme forming with the supporting apparatus of the present invention of the above-mentioned 1110t/h level of separate unit direct current pulverized coal firing boiler, when operation, is 33% left and right if use total moisture content; Volatile matter (V daf) content is 41% left and right; Net calorific value is that certain brown coal coal that the Eastern Inner Mongolia of 15.2MJ/kg produces is feed coal, at maintenance boiler original, exert oneself on substantially constant basis, system consumption of coal is 310t/h, than independent cogeneration operation consumption of coal 220t/h, increase closely 30%, this increases is partly consumed by polygenerations systeme has increased coal gas, tar and other byproducts.
As shown in Figure 1, during system works, high moisture low order feed coal, after the fluidized drying of steam fluidized bed dryer 3, enters before combined pyrolysis of coal device 7, and its total water is down to 6% left and right; The temperature of coal rises to approximately 120 ℃.This coal is subject to fluidisation, the heat exchange of the coal gas of high temperature of approximately 720 ℃ of left and right in combined pyrolysis of coal device 7, makes the pyrolysis temperature of coal reach 440 ℃ of left and right.The pyrolysis temperature of Raw coal of the present invention in aforesaid combination moulded coal pyrolysis installation 7 is positioned below 460 ℃, belong to low temperature pyrogenation, compare with medium and high temperature pyrolysis, although the productive rate of the products such as output semicoke, coal gas and tar decreases, but the volatile content of its output semicoke is higher, is conducive to semicoke and burns in stove; Output caloric power of gas is higher; The lightweight oil ratio that in the tar of output, economic worth is higher is also high.
In order to obtain the interior required high temperature fluidized coal gas of combined pyrolysis of coal device 7, native system utilizes the part purified gas product of output to send into the interior burning of gas fired furnace 10 as fuel gas, the high warm flue gas of output.The warm flue gas of this height (tapping temperature is 1000~1050 ℃) is admitted to the hot junction part of high temperature heat pipe heat exchanger 12 and middle temperature coal gas that high temperature heat pipe heat exchanger 12 cold junctions are sent into carries out heat exchange, make its temperature be elevated to 700~750 ℃, then using it as high temperature fluidized medium, send into the fluidisation coal gas air distribution plate 9 interior ejections of combined pyrolysis of coal device 7.The hot flue gas of the hot junction part of high temperature heat pipe heat exchanger 12 is after heat exchange, and its outflow temperature is reduced to 160~170 ℃.
Purified gas, before entering high temperature heat pipe heat exchanger 12, is introduced into the hot semicoke that semicoke delivery heat transfer device 16 temperature interior and combined pyrolysis of coal device 7 outputs is 380 ℃ of left and right and carries out heat exchange, makes purified gas temperature rise to 150 ℃ and becomes middle temperature coal gas.Hot semicoke is after 16 heat exchange of semicoke delivery heat transfer device, and temperature is reduced to 180~200 ℃.Semicoke after cooling is admitted to coal pulverizer 17 and wears into fine coal and be admitted to Pulverized Fuel Boiler Furnace again.Hot semicoke burns and produces steam in burner hearth, and steam drives supercritical pressure turbine+generator operation output electric power and heating power.
If by the annual operation of whole system 5500 hours, in system power generation and heat supply, every year can also output senior middle school calorific value of gas 13600 ten thousand steres (this coal gas most of use by oneself for native system); 120,000 tons of tar light oils are provided.Wherein one of tar light oil only, can increase approximately 500,000,000 yuan of incomes every year.
Processes and apparatus of the present invention is simple, cheap; The online rate of processing unit is high, and running cost is lower than the polygenerations systeme that adopts circular fluid bed.
Adopt this invention, be particularly advantageous in a lot of low-disintegration coal kinds of ground reserves such as utilizing China Inner Mongol, Xinjiang; Be conducive to directly utilize and account for the fine coal that Coal Exploitation coal output reaches 30% left and right; Be conducive to the conversion on the spot of the coal of the vast central and west regions of China.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims (4)

1. the preposition pyrolysis installation of feed coal for large coal fired boilers, it is characterized in that, comprise raw material coal bunker, the feed opening of described raw material coal bunker bottom is connected with the opening for feed at steam fluidized bed dryer top by rectangular star-like unloading machine, the discharge port of described steam fluidized bed dryer bottom is connected with the opening for feed at combined pyrolysis of coal device middle part by screw-type coal distributor, and the discharge port of described combined pyrolysis of coal bottom of device is connected with coal pulverizer by semicoke delivery heat transfer device;
The bottom of described steam fluidized bed dryer is provided with fluidization steam vapor air distribution plate, described fluidization steam vapor air distribution plate is connected with vapour line, the top of described steam fluidized bed dryer is provided with secondary steam outlet, described secondary steam outlet is connected with secondary steam recovery system by electric precipitator, and the steam outlet of described secondary steam recovery system is connected with described fluidization steam vapor air distribution plate;
Described combined pyrolysis of coal device bottom is provided with fluidisation coal gas air distribution plate, in described combined pyrolysis of coal device, middle part is provided with built-in splitter, described built-in splitter is many inlet cyclones, the aggregate bin top of described combined pyrolysis of coal bottom of device is located in the separating material outlet of described built-in splitter bottom, and the air outlet at described built-in splitter top is connected with described fluidisation coal gas air distribution plate by oil gas purification system, gas compressor, described semicoke delivery heat transfer device, high temperature heat pipe heat exchanger successively;
The hot exhanst gas outlet of gas fired furnace is connected with smoke induced draught fan by described high temperature heat pipe heat exchanger.
2. the preposition pyrolysis installation of feed coal for large coal fired boilers according to claim 1, is characterized in that, described vapour line connects the low-grade vapour pipe of self-generating system.
3. the preposition pyrolysis installation of feed coal for large coal fired boilers according to claim 1, is characterized in that, the fuel gas inlet of described gas fired furnace connects the gas exit from described oil gas purification system.
4. the preposition pyrolysis installation of feed coal for large coal fired boilers according to claim 1, is characterized in that, the discharge port of described coal pulverizer is connected with Pulverized Fuel Boiler Furnace, and the dust mouth of described electric precipitator bottom is connected with the opening for feed of described coal pulverizer.
CN201310684528.0A 2013-12-13 2013-12-13 Feed coal pre-pyrolysis device for large-sized pulverized coal furnace Pending CN103666506A (en)

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CN103965969A (en) * 2014-05-19 2014-08-06 北京蓝天利源科技有限公司 Combined coal pyrolysis gasification system
CN104566430A (en) * 2015-01-14 2015-04-29 中国电力工程顾问集团华东电力设计院有限公司 Coal pulverizing system of thermal power plant and capacity expansion method thereof
CN105255519A (en) * 2015-09-30 2016-01-20 中科合成油工程股份有限公司 Method for predrying, powdering and conveying feed coal and special processing system thereof

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Application publication date: 20140326