CN102635446A - 涡轮入口空气过滤器系统 - Google Patents

涡轮入口空气过滤器系统 Download PDF

Info

Publication number
CN102635446A
CN102635446A CN2012100372363A CN201210037236A CN102635446A CN 102635446 A CN102635446 A CN 102635446A CN 2012100372363 A CN2012100372363 A CN 2012100372363A CN 201210037236 A CN201210037236 A CN 201210037236A CN 102635446 A CN102635446 A CN 102635446A
Authority
CN
China
Prior art keywords
wind
rain cover
air filter
filter system
intake air
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
Application number
CN2012100372363A
Other languages
English (en)
Inventor
E·R·贾里耶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of CN102635446A publication Critical patent/CN102635446A/zh
Pending legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04Air intakes for gas-turbine plants or jet-propulsion plants
    • F02C7/05Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04Air intakes for gas-turbine plants or jet-propulsion plants
    • F02C7/05Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
    • F02C7/055Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with intake grids, screens or guards
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D35/00Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30Filter housing constructions
    • B01D35/31Filter housing constructions including arrangements for environmental protection, e.g. pressure resisting features
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42Auxiliary equipment or operation thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04Air intakes for gas-turbine plants or jet-propulsion plants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04Air intakes for gas-turbine plants or jet-propulsion plants
    • F02C7/05Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
    • F02C7/052Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with dust-separation devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

本发明涉及涡轮入口空气过滤器系统。本申请提供一种用于进入空气流(130)的涡轮入口空气过滤器系统(100)。涡轮入口空气过滤器系统(100)可包括燃气轮机发动机(110)、烟囱(210)、定位在烟囱(210)上的风雨罩(175),以及滤过部(240)。进入空气流(130)流过风雨罩(175)、烟囱(210)、滤过部(240),以及流入燃气轮机发动机(110)中。

Description

涡轮入口空气过滤器系统
技术领域
本申请大体涉及燃气轮机发动机,并且更具体而言,涉及定位在用于燃气轮机发动机的升高的烟囱上的闭式风雨罩。
背景技术
诸如燃气轮机发动机的动力发生装备使用大量进口空气供应来支持燃烧过程。因而可在压缩机的上游使用入口空气过滤系统。含有尘粒、盐和其它杂质的不纯空气可通过侵蚀、腐蚀等而损害压缩机叶片和其它类型的动力装置装备。这种损害可降低装备的预期寿命和性能。为了避免这个问题,入口空气大体穿过一系列的过滤器,以移除杂质。但是,已知的空气过滤器可被诸如雾、雨、雪等环境状况堵塞。这种堵塞可降低过滤和冷却效率,同时增加总体压降。入口空气压力损失还可在整体上导致燃气轮机发动机孔的动力输出有损失。
因此存在对一种改进的燃气轮机入口空气过滤器系统的期望。这种改进的入口空气过滤器系统优选将在任何类型的天气环境中提供充分的过滤。此外,这种改进的燃气轮机入口空气过滤器系统可在其中具有最小的压力损失。具体而言,这种入口空气过滤器系统可以提高的总效率在整体上提高燃气轮机发动机的输出。
发明内容
因而,本申请提供一种用于进入空气流的涡轮入口空气过滤器系统。该涡轮入口空气过滤器系统可包括燃气轮机发动机、烟囱、定位在烟囱上的风雨罩,以及滤过部。进入空气流流过风雨罩、烟囱、滤过部,以及流入燃气轮机发动机中。
本申请进一步提供一种用于进入空气流的涡轮入口空气过滤器系统。该涡轮入口空气过滤器系统可包括燃气轮机发动机、烟囱、定位在烟囱上的可旋转风雨罩,以及滤过部。进入空气流流过可旋转风雨罩、烟囱、滤过部,以及流入燃气轮机发动机中。
本申请进一步提供一种用于进入空气流的涡轮入口空气过滤器系统。该涡轮入口空气过滤器系统可包括燃气轮机发动机、烟囱、定位在烟囱上的多侧式风雨罩,以及滤过部。多侧式风雨罩可在各个侧部上包括许多活辨。进入空气流流过多侧式风雨罩、烟囱、滤过部,以及流入燃气轮机发动机中。
在审阅结合若干附图和所附权利要求所得到的以下详细描述之后,本申请的这些和其它特征与改进对本领域普通技术人员而言将变得显而易见。
附图说明
图1是如可在本文中描述的涡轮入口空气过滤器系统的示意图。
图2是如可在本文中描述的涡轮入口空气过滤器系统的一个备选实施例的示意图。
部件列表
100 涡轮入口空气过滤器系统
110 燃气轮机发动机
120 压缩机
130 空气流
140 燃烧器
150 燃料流
160 燃烧气体流
170 涡轮
175 风雨罩
180 可旋转风雨罩
190 入口管道
200 出口
210 烟囱
215 雾水平
220 旋转装置
230 入口管道
240 滤过部
250 过滤器
260 涡轮入口空气过滤器系统
270 多侧式风雨罩
280 六边形形状
290 侧部
300 活辨
310 活辨
具体实施方式
现在参照附图,其中相同标号在若干幅图中指示相同元件,图1显示了如可在本文中描述的涡轮入口空气过滤器系统100的实例。涡轮入口空气过滤器系统100可用于燃气轮机发动机110。如已知的那样,燃气轮机发动机110可包括压缩机120。压缩机120压缩进入空气流130。压缩机120将压缩空气流130输送给燃烧器140。燃烧器140使压缩空气流130与压缩燃料流150混合,并且点燃混合物而产生燃烧气体流160。燃烧气体流160又被输送给涡轮170。燃烧气体流160驱动涡轮170,以便产生机械功。燃气轮机发动机110可使用天然气、各种类型的合成气,以及/或者其它类型的燃料。燃气轮机发动机110可为许多纽约斯卡奈塔第的通用电气公司等提供的许多不同的燃气轮机发动机中的任何一个。可在本文中使用其它构件和构造。
涡轮入口空气过滤器系统100可包括风雨罩175。在这个实施例中,风雨罩175可为可旋转风雨罩180。虽然可旋转风雨罩180在很大程度上可显示为具有基本竖直的入口190和基本水平的出口200的肘关节形状,但是,可旋转风雨罩180可具有任何期望的大小、形状或定向。可旋转风雨罩180可通过旋转装置220来定位在烟囱210或其它类型的升高的结构上。旋转装置220可为允许可旋转风雨罩180在烟囱210的周围旋转的任何装置。因而,旋转装置220可为一系列的球轴承、滚子等。旋转装置220还可为带动力装置。烟囱210可具有任何期望的高度,但是优选比典型的本地雾水平215高,例如大约二十(20)米或更高。可在本文中使用其它构件和其它构造。
烟囱210可与入口管道230处于连通。入口管道230可具有任何期望的大小、形状或定向。在其中具有任何数量的过滤器250的滤过部240可沿着入口管道230定位。过滤器250可为任何类型的过滤介质。过滤器250可布置在具有不同的容量的各种级中。入口管道230可与燃气轮机发动机110的压缩机120处于连通。可在本文中使用其它构件和其它构造。
在使用中,使用烟囱210确保了可旋转风雨罩180高于典型的本地雾水平215。烟囱210防止雾进入可旋转风雨罩180。因而避开雾等可增强滤过部240的过滤器250的运行。具体而言,应当通过防止雾或其它类型的液体薄雾与过滤器250相互作用来改进过滤器250的效率和寿命。
因而,对可旋转风雨罩180使用旋转装置220允许可旋转风雨罩180始终定向成迎着风。风雨罩180的旋转可受风的驱动,或者可对旋转装置220提供动力,使得可如期望的那样定位风雨罩180。因而,改进的风捕捉应当提高初始压力,以便改进总的燃气轮机效率。因而,涡轮入口空气过滤器系统100提供了提高的效率和改进的构件寿命两者。
图2显示了如可在本文中描述的涡轮入口空气过滤器系统260的一个备选实施例。涡轮入口空气过滤器系统260可包括风雨罩175。在这个实施例中,风雨罩175可呈多侧式风雨罩270的形式。多侧式风雨罩270可定位在烟囱210上,并且与上面描述的其它构件处于连通。多侧式风雨罩270可包括六边形形状280。此外,多侧式风雨罩270可为八边形,或者具有任何数量的侧部290。各个侧部290可具有定位在其上的许多单向活辨300。活辨300可受风的驱动。风可来自任何方向。因而,迎着风的侧部290上的活辨310将打开,而其余活辨300将保持关闭,以便在多侧式风雨罩270内捕捉更多风。可使用任何数量或大小的活辨300。可在本文中使用其它构件和其它构造。
如同上述,改进的风捕捉因而应当提高初始压力,以便改进总的燃气轮机效率。同样,使用烟囱210确保了多侧式风雨罩高于典型的本地雾水平215,以便改进过滤器250和本文的其它构件的预期寿命。
应当显而易见的是,前述仅涉及本申请的某些实施例,并且本领域普通技术人员可在本文中作出许多改变和修改,而不偏离由所附权利要求及其等效方案限定的本发明的大体精神和范围。

Claims (10)

1.一种用于进入空气流(130)的涡轮入口空气过滤器系统(100),包括:
燃气轮机发动机(110);
烟囱(210);
定位在所述烟囱(210)上的风雨罩(175);以及
滤过部(240);
其中,所述进入空气流(130)流过所述风雨罩(175)、所述烟囱(210)、所述滤过部(240),以及流入所述燃气轮机发动机(110)中。
2.根据权利要求1所述的涡轮入口空气过滤器系统(100),其特征在于,所述风雨罩(175)包括可旋转风雨罩(180)。
3.根据权利要求2所述的涡轮入口空气过滤器系统(100),其特征在于,所述可旋转风雨罩(180)包括旋转装置(220)。
4.根据权利要求2所述的涡轮入口空气过滤器系统(100),其特征在于,所述可旋转风雨罩(180)包括竖直入口(190)和水平出口(200)。
5.根据权利要求1所述的涡轮入口空气过滤器系统(100),其特征在于,所述风雨罩(175)包括在各个侧部(290)上具有多个活辨(300,310)的多侧式风雨罩(270)。
6.根据权利要求5所述的涡轮入口空气过滤器系统(100),其特征在于,所述多个活辨(300,310)包括多个单向活辨(300,310)。
7.根据权利要求5所述的涡轮入口空气过滤器系统(100),其特征在于,所述多侧式风雨罩(270)包括具有打开的活瓣(310)的侧部(290)和具有关闭的活辨(300)的多个侧部(290)。
8.根据权利要求5所述的涡轮入口空气过滤器系统(100),其特征在于,所述多侧式风雨罩(270)包括六边形形状(280)。
9.根据权利要求1所述的涡轮入口空气过滤器系统(100),其特征在于,所述烟囱(210)包括高于本地雾水平(215)的高度。
10.根据权利要求1所述的涡轮入口空气过滤器系统(100),其特征在于,所述滤过部(240)在其中包括多个不同的过滤器(250)。
CN2012100372363A 2011-02-11 2012-02-10 涡轮入口空气过滤器系统 Pending CN102635446A (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/025,227 US8349045B2 (en) 2011-02-11 2011-02-11 Turbine inlet air filter system
US13/025227 2011-02-11

Publications (1)

Publication Number Publication Date
CN102635446A true CN102635446A (zh) 2012-08-15

Family

ID=45929904

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012100372363A Pending CN102635446A (zh) 2011-02-11 2012-02-10 涡轮入口空气过滤器系统

Country Status (7)

Country Link
US (1) US8349045B2 (zh)
KR (1) KR20120092512A (zh)
CN (1) CN102635446A (zh)
CZ (1) CZ201297A3 (zh)
GB (1) GB2488043A (zh)
IN (1) IN2012DE00343A (zh)
MX (1) MX2012001836A (zh)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7926256B2 (en) * 2008-10-27 2011-04-19 General Electric Company Inlet system for an EGR system
IT1403220B1 (it) * 2010-12-23 2013-10-17 Nuova Pignone S R L Camera di filtraggio e metodo per mantenere la stessa
GB201108951D0 (en) * 2011-05-24 2011-10-05 Bae Systems Plc Air vehicles
US8715384B2 (en) * 2011-06-23 2014-05-06 General Electric Company Inlet air pulse filtration system
US8465573B2 (en) * 2011-10-05 2013-06-18 General Electric Company System and method for conditioning air flow to a gas turbine
DE102012017918A1 (de) * 2012-09-11 2014-04-03 Balcke-Dürr GmbH Lufteinlasssystem für eine stationäre Brennkraftmaschine, insbesondere eine stationäre Gasturbine
KR101400340B1 (ko) * 2013-03-29 2014-05-28 삼성중공업 주식회사 통합 필터 하우스를 구비한 장치
ITFI20130111A1 (it) * 2013-05-14 2014-11-15 Nuovo Pignone Srl Filtering chamber for gas turbines and method of maintenance thereof
US9358488B2 (en) 2013-11-15 2016-06-07 Bha Altair, Llc Gas turbine filtration system with inlet filter orientation assembly
CN103691241B (zh) * 2013-12-20 2015-04-01 山东大学 风力驱动的pm2.5空气净化系统和净化方法
KR101597023B1 (ko) 2014-03-20 2016-02-24 연세대학교 산학협력단 공액 고분자 기반 유기나노켄처 및 이의 제조방법
US10267234B2 (en) * 2015-07-06 2019-04-23 Dresser-Rand Company Motive air conditioning system for gas turbines
US10099804B2 (en) 2016-06-16 2018-10-16 General Electric Company Environmental impact assessment system
US10610817B2 (en) * 2016-11-02 2020-04-07 Jawn P. Swan Cleanroom workstation particle capture system
US10369506B1 (en) 2018-11-19 2019-08-06 Physician Electronic Networks LLC System, method, and apparatus to reduce urban air pollution

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003052215A1 (en) * 2001-12-14 2003-06-26 Shane West Wind directional skylight vent
CN101205834A (zh) * 2006-12-18 2008-06-25 Bha控股公司 湿气去除设备和方法
CN101539057A (zh) * 2007-11-30 2009-09-23 尤洛考普特公司 带有可控过滤系统的涡轮发动机进气件
US20100037777A1 (en) * 2008-08-12 2010-02-18 General Electric Company Inlet air conditioning system for a turbomachine

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB247467A (en) 1925-07-28 1926-02-18 Emil Eduard Eckardt Process of producing line drawings and the like from photographic exposures
US4312645A (en) * 1980-03-10 1982-01-26 Parmatic Filter Corporation Separator assembly
JP2003254088A (ja) 2002-03-05 2003-09-10 Kansai Electric Power Co Inc:The ガスタービン用吸気フィルタユニット
US7963095B2 (en) 2006-06-21 2011-06-21 General Electric Company Inlet air conditioning system
US7648564B2 (en) 2006-06-21 2010-01-19 General Electric Company Air bypass system for gas turbine inlet
US20080098891A1 (en) 2006-10-25 2008-05-01 General Electric Company Turbine inlet air treatment apparatus
US7291196B1 (en) 2006-11-16 2007-11-06 Lerner Bernard J Filamentary pad for improved mist elimination and mass transfer
US8167980B2 (en) 2008-08-28 2012-05-01 General Electric Company Filtration system for gas turbines
US8182587B2 (en) 2008-08-28 2012-05-22 General Electric Company Filtration system for gas turbines
US20100171314A1 (en) 2009-01-08 2010-07-08 Justin Dale Tackett Vertically Oriented Wind Tower Generator
US8048186B2 (en) 2009-04-02 2011-11-01 General Electric Company Filter retention systems and devices
US8365530B2 (en) 2009-06-03 2013-02-05 General Electric Company System for conditioning the airflow entering a turbomachine
US8245383B2 (en) * 2009-10-23 2012-08-21 General Electric Company Moisture separation system and method of assembling the same
US8303678B2 (en) 2009-12-30 2012-11-06 General Electric Company Intake air filter system
US8273158B2 (en) * 2010-11-29 2012-09-25 General Electric Company Mist eliminator, moisture removal system, and method of removing water particles from inlet air

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003052215A1 (en) * 2001-12-14 2003-06-26 Shane West Wind directional skylight vent
CN101205834A (zh) * 2006-12-18 2008-06-25 Bha控股公司 湿气去除设备和方法
CN101539057A (zh) * 2007-11-30 2009-09-23 尤洛考普特公司 带有可控过滤系统的涡轮发动机进气件
US20100037777A1 (en) * 2008-08-12 2010-02-18 General Electric Company Inlet air conditioning system for a turbomachine

Also Published As

Publication number Publication date
KR20120092512A (ko) 2012-08-21
CZ201297A3 (cs) 2012-08-22
IN2012DE00343A (zh) 2015-04-10
US8349045B2 (en) 2013-01-08
MX2012001836A (es) 2013-02-20
GB2488043A (en) 2012-08-15
GB201202292D0 (en) 2012-03-28
US20120204525A1 (en) 2012-08-16

Similar Documents

Publication Publication Date Title
CN102635446A (zh) 涡轮入口空气过滤器系统
US9157367B2 (en) Turbine inlet air filter system with elbow access gate
Wilcox et al. Technology review of modern gas turbine inlet filtration systems
US8349043B2 (en) Turbine inlet air system
Suman et al. A compressor fouling review based on an historical survey of asme turbo expo papers
US20080098891A1 (en) Turbine inlet air treatment apparatus
US8163072B2 (en) Filter washing system for gas turbine engines
US8715384B2 (en) Inlet air pulse filtration system
Wilcox et al. Successful selection and operation of gas turbine inlet filtration systems
CN107269394B (zh) 一种用于燃气轮机入口的过滤器
CN106321245B (zh) 用于燃气涡轮的空气供应和调节系统
CN103032932A (zh) 一种工业车间通风换气装置
CN207395095U (zh) 一种用于防止气体回流的风机出风口结构
CN206655848U (zh) 一种无尘离心通风机
CN202435764U (zh) 防腐蚀电气柜
CN205127572U (zh) 一种具有自循环清灰装置的滤袋式除尘器
CN203906405U (zh) 引风机清洗装置
CN203640805U (zh) 一种旁通阀及发动机曲轴箱通风系统的旁通保护结构
Hiner Strategy for selecting optimised technologies for gas turbine air inlet filtration systems
JP3174549U (ja) 水車装置
Madsen et al. Gas Turbine Fouling Offshore: Air Intake Filtration Optimization
CN102477999A (zh) 一种通风柜风机
CN203990121U (zh) 一种用于冷凝锅炉的过滤及烟气止回装置
CN107940486A (zh) 锅炉用余热回收设备
CN104138693B (zh) 一种用于冷凝锅炉的过滤及烟气止回装置

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
ASS Succession or assignment of patent right

Owner name: BHA AERTAIER CO., LTD.

Free format text: FORMER OWNER: GENERAL ELECTRIC CO.

Effective date: 20140320

C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20140320

Address after: Tennessee

Applicant after: GEN ELECTRIC

Address before: American New York

Applicant before: General Electric Company

C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20120815