CN102997214A - 1,000MW ultra-supercritical tower type baffle bitangent circular boil and working method - Google Patents
1,000MW ultra-supercritical tower type baffle bitangent circular boil and working method Download PDFInfo
- Publication number
- CN102997214A CN102997214A CN2012105782152A CN201210578215A CN102997214A CN 102997214 A CN102997214 A CN 102997214A CN 2012105782152 A CN2012105782152 A CN 2012105782152A CN 201210578215 A CN201210578215 A CN 201210578215A CN 102997214 A CN102997214 A CN 102997214A
- Authority
- CN
- China
- Prior art keywords
- water
- connects
- superheater
- cooling wall
- circle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Chimneys And Flues (AREA)
Abstract
Provided are a 1,000MW ultra-supercritical tower type baffle bitangent circular boil and a working method. At present, tower type boilers put into operation in China are many, flue gas deviation of the tower type boilers is small, a heating surface can automatically drain water, the starting speed is quick, and the occupied area is small. The 1,000MW ultra-supercritical tower type baffle bitangent circular boil comprises a boiler body (1), and a flue gas baffle (15) is installed at the top of the boiler body, and a water-cooling wall (2) is installed on the outer side of the boiler body and is connected with a denitration device (17) and an air preheater (12) through a flue. The water-cooling wall is connected with a water storage tank (5) through a steam-water separator (4), a burner in eight-corner arrangement is installed on the lower portion of the water-cooling wall, a coal economizer (6) is installed in the water-cooling wall, the water-cooling wall is connected with the separator (4), the separator is connected with a primary superheater (11), the primary superheater is connected with a secondary superheater (8), the secondary superheater is connected with a final superheater (10), a low temperature reheater (7) is connected with a high temperature reheater (9), and a middle partition (16) is connected with the separator and an outlet of the primary superheater. The working method is used for the tower type boil.
Description
Technical field:
The present invention relates to the two circle of contact boilers of the tower baffle plate of a kind of 1000MW ultra supercritical and method of work.
Background technology:
The domestic tower boiler that puts into operation is a lot of at present, and tower boiler has lot of advantages, and is little such as the flue gas deviation, and heating surface can be hydrophobic voluntarily, and toggle speed is fast, and floor space is little.But the temperature adjustment of reheater can only be regulated by burner swing and water spray, and burner swing is difficult to control, and water spray is regulated the efficient that reheat steam temperature has reduced boiler.
Summary of the invention:
The purpose of this invention is to provide a kind of advantage that not only keeps conventional tower boiler, and the reheater steam temperature also can be regulated by baffle plate as π type stove; And the two circle of contact boilers of the tower baffle plate of 1000MW ultra supercritical that can reduce the boiler cost and method.
Above-mentioned purpose realizes by following technical scheme:
The two circle of contact boilers of the tower baffle plate of a kind of 1000MW ultra supercritical, its composition comprises: body of heater, gas baffle is equipped with at described body of heater top, water-cooling wall is equipped with in the described body of heater outside, described water-cooling wall connects denitrification apparatus by flue, described water-cooling wall connects storage tank by steam-water separator, the anistree burner of arranging is equipped with in described water-cooling wall bottom, in the described water-cooling wall economizer is housed, described water-cooling wall connects separator, described separator connects primary superheater, described primary superheater connects two-stage superheater, described two-stage superheater connects finishing superheater, and low-temperature reheater connects high temperature reheater, and midfeather connects the outlet of described separator and described primary superheater.
The two circle of contact boilers of the tower baffle plate of described 1000MW ultra supercritical, described flue comprises the furnace outlet flue, described furnace outlet flue connects the denitrification apparatus gas approach, described denitrification apparatus gas approach connects denitrification apparatus, described denitrification apparatus connects the denitration outlet flue, described denitration outlet flue connects the preheater gas approach, and described preheater gas approach connects preheater and exhaust pass thereof.
The two circle of contact boilers of the tower baffle plate of described 1000MW ultra supercritical, described burner comprises SOFA burner and main burner.
The two circle of contact boilers of the tower baffle plate of described 1000MW ultra supercritical, described water-cooling wall comprises vertical water wall, described vertical water wall connects described middle mixing header, mixing header connects upper furnace pitches pipe in the middle of described, and described upper furnace pitches pipe connects top coarse pitch vertical water wall.
The two circle of contact boilers of the tower baffle plate of described 1000MW ultra supercritical, described economizer comprises left side economizer and right side economizer, described left side economizer and described two-stage superheater are contained in the left side of midfeather, described right side economizer and described low-temperature reheater are contained in the right side of described midfeather, and described economizer connects described water-cooling wall.
The two circle of contact boilers of the tower baffle plate of described 1000MW ultra supercritical, described economizer, described low-temperature reheater, described two-stage superheater, described high temperature reheater, described finishing superheater, described primary superheater, the middle cabinet that mixes are contained in the described water-cooling wall from top to bottom in turn; Described two-stage superheater is contained in a side of described midfeather, and described low-temperature reheater and described high temperature reheater are contained in the opposite side of described midfeather.
The method of work of the two circle of contact boilers of the tower baffle plate of a kind of 1000MW ultra supercritical, burner adopts large bellows structure, by dividing plate large bellows is separated into some air compartments, arranges the burner nozzle that quantity does not wait in the exit of each bellows; Burner arrangement is anistree two circle of contact traditional method of indicating the pronunciation of a Chinese character and arranges on the front-back wall of furnace wall cooling; Per four burners form a circle of contact; Regulate overheating steam temperature by coal-water ratio and two-stage spray desuperheating, regulate reheat steam temperature by the damper that is arranged in furnace roof.
Beneficial effect:
1. the present invention makes boiler reheater can use gas baffle to regulate steam temperature, has improved the efficient of boiler, has increased the reliability of unit.
One of them index of the safe operation of unit of the present invention is exactly whether heating surface moves safety, particularly direct current supercritical tower-type boiler, because the arrangement of heating surface, high-temperature surface is in the higher zone of flue-gas temperature.Therefore, the Rational choice of boiler heating surface is particularly important in boiler design, but the at present main calculation of Wall Temperature program that relies on of choosing of boiler heating surface.For this this product carries out the secondary redevelopment to existing calculation of Wall Temperature program, increase relevant resistant to elevated temperatures material category, carry out more greatly selection material according to deviation factor simultaneously, make the selection of boiler heating surface more safe and reliable.
The present invention has formed the exclusive boiler structure form of a cover, special burner structure and the system of safe and stable operation.This product has good social effect and market potential, is First, product advanced in the world.
The present invention is for economic benefit and social benefit, and unit operation 1 year can the fuel savings expense with respect to conventional tower boiler approximately 3,000 ten thousand yuan,
5. boiler superheater of the present invention and reheater all adopt horizontally disposedly, have realized having accelerated start-up time simultaneously from hydrophobic function; Aspect burner design, used the low NOx Horizontal burner of breathing out the pot independent research, and adopted two circle of contact traditional methods of indicating the pronunciation of a Chinese character to reduce the flue gas deviation; Economizer exit flue reasonable in design arranged simply, reduced the resistance of fume side, simplified simultaneously the layout of hanging of back-end ductwork; Can adopt the band pump or not be with the pump startup system according to user's needs.
Layout and the boiler operatiopn aspect in the novel heating surface layout of the present invention, the application of heating surface material, burner arrangement, cigarette air channel and have stronger coal and unit capacity adaptability; Heating surface specifications at different levels and heat absorption ratio are reasonable, and structure easily realizes.
The present invention compares with conventional tower boiler, has increased gas baffle and midfeather, so that two-stage superheater and reheater are arranged in respectively the both sides of midfeather; This product adopts two circle of contacts to arrange, can obviously reduce the flue gas deviation of furnace outlet both sides.
The present invention relies on proprietary technology to develop the two circle of contact boilers of the tower baffle plate of 1000MW ultra supercritical fully, and this type of furnace can be used for using the bituminous coal unit.Require special research and development for satisfying Utilities Electric Co.'s " energy-saving and emission-reduction ", have good social effect and market potential, be First, product advanced in the world.
Description of drawings:
The structural representation of 1 product of accompanying drawing.
The specific embodiment:
Embodiment 1:
The two circle of contact boilers of the tower baffle plate of a kind of 1000MW ultra supercritical, its composition comprises: body of heater 1, water-cooling wall 2 is equipped with in described body of heater outer ring, described water-cooling wall connects denitrification apparatus 17 and air preheater 12 by flue, described water-cooling wall connects storage tank 5 by steam-water separator 4, SOFA burner 13 and main burner 14 are equipped with in described water-cooling wall bottom, described water-cooling wall inside is furnished with economizer 6 from top to bottom successively, low-temperature reheater 7, two-stage superheater 8, high temperature reheater 9, finishing superheater 10, primary superheater 11, middle mixing header 18, described economizer connects water-cooling wall, described water-cooling wall connects separator, described separator connects primary superheater, described primary superheater connects two-stage superheater, described low-temperature reheater connects high temperature reheater, wherein two-stage superheater 8 is arranged in the left side of midfeather 16, and low-temperature reheater is arranged in the right side of midfeather.
Embodiment 2:
The two circle of contact boilers of the tower baffle plate of embodiment 1 described 1000MW ultra supercritical, its composition comprises: body of heater, gas baffle is equipped with at described body of heater top, water-cooling wall is equipped with in the described body of heater outside, described water-cooling wall connects denitrification apparatus by flue, described water-cooling wall connects storage tank by steam-water separator, burner is equipped with in described water-cooling wall bottom, in the described water-cooling wall economizer is housed, described water-cooling wall connects separator, described separator connects primary superheater, described primary superheater connects two-stage superheater, described two-stage superheater connects finishing superheater, and low-temperature reheater connects high temperature reheater, and midfeather connects the outlet of described separator and described primary superheater.Described furnace roof baffle plate 15 regulation reheat steam temperatures.Described flue comprises the furnace outlet flue, and described furnace outlet flue connects preheater gas approach 3, and described preheater gas approach connects denitrification apparatus 17 and air preheater 12.
Embodiment 3:
The two circle of contact boilers of the tower baffle plate of embodiment 1 described 1000MW ultra supercritical, described burner comprises SOFA burner 13 and main burner 14.
Embodiment 4:
The two circle of contact boilers of the tower baffle plate of embodiment 1 described 1000MW ultra supercritical, described water-cooling wall 2 comprises lower vertical pipeloop water-cooling wall, middle mixing header, pitches pipe and upper vertical pipeloop water-cooling wall.
Embodiment 5:
The two circle of contact boilers of the tower baffle plate of described 1000MW ultra supercritical, described economizer, described low-temperature reheater, described two-stage superheater, described high temperature reheater, described finishing superheater, described primary superheater, the middle cabinet that mixes are contained in the described water-cooling wall from top to bottom in turn; Described two-stage superheater is contained in a side of described midfeather, and described low-temperature reheater and described high temperature reheater are contained in the opposite side of described midfeather.
Embodiment 6:
The combustion method of the two circle of contact boilers of the tower baffle plate of a kind of 1000MW ultra supercritical, burner adopts large bellows structure, by dividing plate large bellows is separated into some air compartments, arranges the burner nozzle that quantity does not wait in the exit of each bellows; Burner arrangement is anistree two circle of contact traditional method of indicating the pronunciation of a Chinese character and arranges on the front-back wall of furnace wall cooling; Per four burners form a circle of contact; Regulate overheating steam temperature by coal-water ratio and two-stage spray desuperheating, regulate reheat steam temperature by the damper that is arranged in furnace roof.
A boiler will be determined its relevant design parameter, and what carry out at first is according to boundary condition (ature of coal data, designing requirement, environmental condition), calculates by the heat transfer of boiler.Heavy duty boiler all adopts computer program to carry out now, namely so-called boiler thermodynamic calculation program.For tower double-flue boiler, breathe out pot for contacting first, experience is fewer aspect heating power calculating, therefore, breathe out subcritical, supercritical unit that pot absorbs and use for reference successful operation, develop on original Thermodynamic Calculation Program basis and perfect, simultaneously the coefficient correlation in the program is revised, develop the overcritical Thermodynamic Calculation Program that a cover is fit to tower double-flue boiler.
Claims (7)
1. two circle of contact boilers of the tower baffle plate of 1000MW ultra supercritical, its composition comprises: body of heater, it is characterized in that: gas baffle is equipped with at described body of heater top, water-cooling wall is equipped with in the described body of heater outside, described water-cooling wall connects denitrification apparatus by flue, described water-cooling wall connects storage tank by steam-water separator, the anistree burner of arranging is equipped with in described water-cooling wall bottom, in the described water-cooling wall economizer is housed, described water-cooling wall connects separator, described separator connects primary superheater, described primary superheater connects two-stage superheater, described two-stage superheater connects finishing superheater, and low-temperature reheater connects high temperature reheater, and midfeather connects the outlet of described separator and described primary superheater.
2. two circle of contact boilers of the tower baffle plate of 1000MW ultra supercritical according to claim 1, it is characterized in that: described flue comprises the furnace outlet flue, described furnace outlet flue connects the denitrification apparatus gas approach, described denitrification apparatus gas approach connects denitrification apparatus, described denitrification apparatus connects the denitration outlet flue, described denitration outlet flue connects the preheater gas approach, and described preheater gas approach connects preheater and exhaust pass thereof.
3. two circle of contact boilers of the tower baffle plate of 1000MW ultra supercritical according to claim 1, it is characterized in that: described burner comprises SOFA burner and main burner.
4. according to claim 1 and 2 or the two circle of contact boilers of the tower baffle plate of 3 described 1000MW ultra supercriticals, it is characterized in that: described water-cooling wall comprises vertical water wall, described vertical water wall connects described middle mixing header, mixing header connects upper furnace pitches pipe in the middle of described, and described upper furnace pitches pipe connects top coarse pitch vertical water wall.
5. according to claim 1 and 2 or the two circle of contact boilers of the tower baffle plate of 3 described 1000MW ultra supercriticals, it is characterized in that: described economizer comprises left side economizer and right side economizer, described left side economizer and described two-stage superheater are contained in the left side of midfeather, described right side economizer and described low-temperature reheater are contained in the right side of described midfeather, and described economizer connects described water-cooling wall.
6. two circle of contact boilers of the tower baffle plate of 1000MW ultra supercritical according to claim 1 or 5, it is characterized in that: described economizer, described low-temperature reheater, described two-stage superheater, described high temperature reheater, described finishing superheater, described primary superheater, the middle cabinet that mixes are contained in the described water-cooling wall from top to bottom in turn; Described two-stage superheater is contained in a side of described midfeather, and described low-temperature reheater and described high temperature reheater are contained in the opposite side of described midfeather.
7. the combustion method of the two circle of contact boilers of the tower baffle plate of 1000MW ultra supercritical, it is characterized in that: burner adopts large bellows structure, by dividing plate large bellows is separated into one group of air compartment, arranges burner nozzle in the exit of each bellows; Burner arrangement is anistree two circle of contact traditional method of indicating the pronunciation of a Chinese character and arranges on the front-back wall of furnace wall cooling; Per four burners form a circle of contact; Regulate overheating steam temperature by coal-water ratio and two-stage spray desuperheating, regulate reheat steam temperature by the damper that is arranged in furnace roof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105782152A CN102997214A (en) | 2012-12-26 | 2012-12-26 | 1,000MW ultra-supercritical tower type baffle bitangent circular boil and working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105782152A CN102997214A (en) | 2012-12-26 | 2012-12-26 | 1,000MW ultra-supercritical tower type baffle bitangent circular boil and working method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102997214A true CN102997214A (en) | 2013-03-27 |
Family
ID=47926131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105782152A Pending CN102997214A (en) | 2012-12-26 | 2012-12-26 | 1,000MW ultra-supercritical tower type baffle bitangent circular boil and working method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102997214A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247306A (en) * | 2016-09-14 | 2016-12-21 | 华能国际电力股份有限公司 | Supercritical carbon dioxide boiler heating surface arrangement mode for preventing pipe wall from overtemperature |
| CN108518664A (en) * | 2018-05-31 | 2018-09-11 | 哈尔滨锅炉厂有限责任公司 | One kind matching the tower damper adjustment boiler using brown coal of fan mill high capacity highly effective ultra supercritical |
| CN109945158A (en) * | 2019-03-25 | 2019-06-28 | 哈尔滨锅炉厂有限责任公司 | A Hedging Tower Type 660MW Secondary Reheat Boiler |
| CN110332514A (en) * | 2019-08-22 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | A high-efficiency wide-load double-reheat tower furnace economizer hierarchical layout system |
| CN110779007A (en) * | 2019-12-09 | 2020-02-11 | 哈尔滨锅炉厂有限责任公司 | System for moving high-level economizer of tower furnace to tail flue and improving energy level utilization arrangement |
| CN115371037A (en) * | 2022-08-29 | 2022-11-22 | 哈尔滨锅炉厂有限责任公司 | Self-dewatering baffle temperature-adjusting efficient supercritical low-calorific-value gas boiler for combustion |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011214764A (en) * | 2010-03-31 | 2011-10-27 | Babcock Hitachi Kk | Method of diagnosing adhesion of hematite scale |
| CN102230614A (en) * | 2011-04-07 | 2011-11-02 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| CN102434870A (en) * | 2011-12-21 | 2012-05-02 | 哈尔滨锅炉厂有限责任公司 | 350MW supercritical tower-type lignite boiler |
| CN102537937A (en) * | 2012-02-26 | 2012-07-04 | 哈尔滨锅炉厂有限责任公司 | Device for adjusting temperature of reheated steam of boiler by aid of three tail-flues |
| CN102679307A (en) * | 2012-06-08 | 2012-09-19 | 哈尔滨锅炉厂有限责任公司 | 1000MW supercritical tower lignite boiler |
| CN102128443B (en) * | 2011-03-08 | 2012-12-12 | 中国华能集团清洁能源技术研究院有限公司 | Pulverized coal boiler suitable for ultrahigh steam temperature |
| CN202973048U (en) * | 2012-12-26 | 2013-06-05 | 哈尔滨锅炉厂有限责任公司 | 1000 megawatt(MW) ultra-supercritical tower-type baffle bitangent circular boiler |
-
2012
- 2012-12-26 CN CN2012105782152A patent/CN102997214A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011214764A (en) * | 2010-03-31 | 2011-10-27 | Babcock Hitachi Kk | Method of diagnosing adhesion of hematite scale |
| CN102128443B (en) * | 2011-03-08 | 2012-12-12 | 中国华能集团清洁能源技术研究院有限公司 | Pulverized coal boiler suitable for ultrahigh steam temperature |
| CN102230614A (en) * | 2011-04-07 | 2011-11-02 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| CN102434870A (en) * | 2011-12-21 | 2012-05-02 | 哈尔滨锅炉厂有限责任公司 | 350MW supercritical tower-type lignite boiler |
| CN102537937A (en) * | 2012-02-26 | 2012-07-04 | 哈尔滨锅炉厂有限责任公司 | Device for adjusting temperature of reheated steam of boiler by aid of three tail-flues |
| CN102679307A (en) * | 2012-06-08 | 2012-09-19 | 哈尔滨锅炉厂有限责任公司 | 1000MW supercritical tower lignite boiler |
| CN202973048U (en) * | 2012-12-26 | 2013-06-05 | 哈尔滨锅炉厂有限责任公司 | 1000 megawatt(MW) ultra-supercritical tower-type baffle bitangent circular boiler |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247306A (en) * | 2016-09-14 | 2016-12-21 | 华能国际电力股份有限公司 | Supercritical carbon dioxide boiler heating surface arrangement mode for preventing pipe wall from overtemperature |
| CN106247306B (en) * | 2016-09-14 | 2018-07-17 | 华能国际电力股份有限公司 | Supercritical carbon dioxide boiler heating surface arrangement mode for preventing pipe wall from overtemperature |
| CN108518664A (en) * | 2018-05-31 | 2018-09-11 | 哈尔滨锅炉厂有限责任公司 | One kind matching the tower damper adjustment boiler using brown coal of fan mill high capacity highly effective ultra supercritical |
| CN109945158A (en) * | 2019-03-25 | 2019-06-28 | 哈尔滨锅炉厂有限责任公司 | A Hedging Tower Type 660MW Secondary Reheat Boiler |
| CN110332514A (en) * | 2019-08-22 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | A high-efficiency wide-load double-reheat tower furnace economizer hierarchical layout system |
| CN110779007A (en) * | 2019-12-09 | 2020-02-11 | 哈尔滨锅炉厂有限责任公司 | System for moving high-level economizer of tower furnace to tail flue and improving energy level utilization arrangement |
| CN115371037A (en) * | 2022-08-29 | 2022-11-22 | 哈尔滨锅炉厂有限责任公司 | Self-dewatering baffle temperature-adjusting efficient supercritical low-calorific-value gas boiler for combustion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102997214A (en) | 1,000MW ultra-supercritical tower type baffle bitangent circular boil and working method | |
| CN201103894Y (en) | Saturated steam heating stove | |
| CN102434870A (en) | 350MW supercritical tower-type lignite boiler | |
| CN107388221A (en) | A kind of ultralow nitrogen condensation horizontal steam boiler of four backhauls | |
| CN202747760U (en) | Primary air temperature bidirectional adjusting system for power station boiler | |
| CN202973048U (en) | 1000 megawatt(MW) ultra-supercritical tower-type baffle bitangent circular boiler | |
| CN105953217B (en) | The 1000MW ultra supercritical double reheat boilers of high reheat steam temperature wide regulating ratio | |
| CN203549801U (en) | Compact biomass circulating fluidized bed boiler | |
| CN103256607A (en) | Compound-type waste incineration boiler | |
| CN104406144A (en) | Double-medium waste heat boiler | |
| CN102679307A (en) | 1000MW supercritical tower lignite boiler | |
| CN205748005U (en) | A kind of sintering device flue gas bootstrap system of improvement | |
| CN103851603B (en) | The band SCR pulverized-coal fired boiler of compact arrangement | |
| CN103727519A (en) | Device for preventing low-temperature corrosion of economizer heating surface | |
| CN205878138U (en) | Wide turndown ratio's of high reheat steam temperature 1000MW ultra supercritical double reheat boiler | |
| CN103115434A (en) | Numerically-controlled methanol condensation boiler | |
| CN202675614U (en) | High-temperature vacuum superconducting phase-change heating furnace | |
| CN103322552A (en) | Single-pressure saturated-steam superheat boiler | |
| CN104990264A (en) | Full-condensation boiler | |
| CN203656895U (en) | Device for preventing low temperature corrosion on coal economizer heating surfaces | |
| CN202613408U (en) | 1000MW supercritical tower-type lignite boiler | |
| CN208349268U (en) | A kind of combination energy steam generator | |
| CN102679308B (en) | Subcritical, the overcritical oil oven of Large Copacity more than high parameter 600MW | |
| CN103363540B (en) | Intensification afterburning system under a kind of Power Station Boiler in Low Loads runs | |
| CN202675592U (en) | Vertical type energy-saving gilled pipe boiler using biomass as fuel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130327 |