US20120183913A1 - Tower distribution in a coal burning power plant - Google Patents

Tower distribution in a coal burning power plant Download PDF

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Publication number
US20120183913A1
US20120183913A1 US13/277,526 US201113277526A US2012183913A1 US 20120183913 A1 US20120183913 A1 US 20120183913A1 US 201113277526 A US201113277526 A US 201113277526A US 2012183913 A1 US2012183913 A1 US 2012183913A1
Authority
US
United States
Prior art keywords
wall structure
working media
tower distributor
vane member
inlet
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.)
Abandoned
Application number
US13/277,526
Other languages
English (en)
Inventor
David C. White
Sergey Kaushansky
Jiefeng Shan
Paul D. Kazalski
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.)
Amec Foster Wheeler North America Corp
Original Assignee
Siemens Energy Inc
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 Siemens Energy Inc filed Critical Siemens Energy Inc
Priority to US13/277,526 priority Critical patent/US20120183913A1/en
Assigned to SIEMENS ENERGY, INC. reassignment SIEMENS ENERGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHAN, JIEFENG, KAUSHANSKY, Sergey, KAZALSKI, Paul D., WHITE, DAVID C.
Priority to CA2824733A priority patent/CA2824733A1/en
Priority to EP11799935.9A priority patent/EP2663808A2/en
Priority to RU2013137764/06A priority patent/RU2552888C2/ru
Priority to KR1020137021256A priority patent/KR101567286B1/ko
Priority to JP2013548407A priority patent/JP2014505226A/ja
Priority to PCT/US2011/064353 priority patent/WO2012096742A2/en
Priority to AU2011354664A priority patent/AU2011354664B2/en
Priority to CN201180068392.XA priority patent/CN103392096B/zh
Priority to MX2013008140A priority patent/MX2013008140A/es
Publication of US20120183913A1 publication Critical patent/US20120183913A1/en
Assigned to FOSTER WHEELER NORTH AMERICA CORP. reassignment FOSTER WHEELER NORTH AMERICA CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SIEMENS ENERGY, INC.
Assigned to AMEC FOSTER WHEELER NORTH AMERICA CORP. reassignment AMEC FOSTER WHEELER NORTH AMERICA CORP. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: FOSTER WHEELER NORTH AMERICA CORP.
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/10—Supply line fittings
    • F23K2203/105—Flow splitting devices to feed a plurality of burners

Definitions

  • the present invention relates to a tower distributor in a coal burning power plant, and more particularly, to a tower distributor including a plurality of working media flow directing structures for providing a generally even distribution of pulverized coal and carrier air to one or more burners of the power plant.
  • pulverized coal In a coal burning power plant, pulverized coal is transported through a pipe or duct system that connects an exhauster mill to one or more burners of a furnace.
  • the pulverized coal is typically transported within the pipe system by a carrier gas, e.g., air, which combines with the pulverized coal to form a heterogeneous stream of working media.
  • a carrier gas e.g., air
  • the solid particles of the pulverized coal in the stream of working media tend to concentrate together in a pattern generally referred to in the art as a rope strand. This phenomenon is commonly referred to in the art as “roping”.
  • a tower distributor receives a stream of working media including pulverized coal and a carrier gas in a coal burning power plant.
  • the tower distributor comprises a wall structure and at least one diverter.
  • the wall structure defines a flow passageway for the stream of working media and includes an inlet and an outlet spaced from the inlet in an axial direction.
  • Each diverter is located between the inlet and the outlet and is affixed to an inner surface of the wall structure.
  • Each diverter extends axially and circumferentially along the wall structure from a first position located at an area of working media concentration downstream from the inlet to a second position downstream from the first position. Further, each diverter defines a flow channel to effect a diversion of a portion of the stream of working media from the first position to the second position.
  • a tower distributor receives a stream of working media including pulverized coal and a carrier gas in a coal burning power plant.
  • the tower distributor comprises a wall structure and a pair of diverters.
  • the wall structure defines a flow passageway for the stream of working media and includes an inlet and an outlet spaced from the inlet in an axial direction.
  • the diverters are affixed to an inner surface of the wall structure and are located circumferentially adjacent to one another between the inlet and the outlet of the wall structure.
  • the diverters extend along the wall structure in the axial direction and extend circumferentially in opposite directions.
  • the diverters extend from respective first positions located at an area of working media concentration downstream from the inlet to respective second positions downstream from the respective first positions.
  • the diverters define flow channels to effect a diversion of respective portions of the stream of working media from the respective first positions to the corresponding second positions.
  • the working media flowing through the tower distributor forms a coal rope, and the area of working media concentration defines an area of the coal rope with a higher allocation of pulverized coal than a remaining portion of the coal rope.
  • a tower distributor receives a stream of working media including pulverized coal and a carrier gas in a coal burning power plant.
  • the tower distributor comprises a wall structure, at least one diverter, and at least one adjustable vane member.
  • the wall structure defines a flow passageway for the stream of working media and includes an inlet and an outlet spaced from the inlet in an axial direction.
  • Each diverter is located between the inlet and the outlet and is affixed to an inner surface of the wall structure.
  • Each diverter extends axially and circumferentially along the wall structure from a first position located at an area of working media concentration downstream from the inlet to a second position downstream from the first position.
  • the area of working media concentration is located on a circumferentially opposed side of the wall structure than an exhauster mill fan that delivers the stream of working media to the tower distributor. Further, each diverter defines a flow channel to effect a diversion of a portion of the stream of working media from the first position to the second position.
  • Each vane member is attached to the wall structure and extends radially inwardly from the inner surface of the wall structure.
  • FIG. 1 is a side plan view of a portion of a coal burning power plant including a tower distributor according to an embodiment of the invention
  • FIG. 2 is a cross sectional view of the tower distributor in FIG. 1 taken along line 2 - 2 in FIG. 1 ;
  • FIG. 3 is a cross sectional view of the tower distributor in FIGS. 1 and 2 taken along line 3 - 3 in FIG. 2 ;
  • FIG. 4 is a perspective view of the tower distributor in FIGS. 1-3 shown with a wall structure of the tower distributor depicted in phantom lines.
  • the power plant 10 includes a conventional exhauster mill fan 12 , also known as a coal mill fan, a tower distributor 14 , and a plurality of conventional burners (not shown) downstream from the tower distributor 14 with respect to a direction of coal flow through the power plant 10 , as generally represented by the line-arrows 16 in FIG. 1 .
  • a conventional exhauster mill fan 12 also known as a coal mill fan
  • a tower distributor 14 and a plurality of conventional burners (not shown) downstream from the tower distributor 14 with respect to a direction of coal flow through the power plant 10 , as generally represented by the line-arrows 16 in FIG. 1 .
  • An exhauster mill receives coal and a carrier gas; e.g., air, pulverizes the coal for distribution via the carrier gas, and directs the pulverized coal and carrier air toward the tower distributor 14 via the exhauster mill fan 12 .
  • a carrier gas e.g., air
  • the combination of pulverized coal and carrier gas is referred to herein as “working media”.
  • the power plant 10 includes one or more feed pipes 18 (one shown in FIG. 1 ) that is/are provided to distribute the working media from the exhauster mill fan 12 to the tower distributor 14 .
  • the tower distributor 14 comprises a wall structure 20 defining a flow passageway 22 for the stream of working media.
  • the wall structure 20 may comprise one or more conduits, and in the embodiment shown the wall structure 20 comprises first and second conduits 20 A, 20 B bolted together.
  • the wall structure includes an inlet 24 that receives the stream of working media from the exhauster mill fan 12 via the feed pipes 18 .
  • the wall structure 20 further includes an outlet 26 spaced from the inlet 24 in an axial direction of the tower distributor 14 , see FIGS. 2 and 3 . As illustrated in FIGS. 2 and 3 , the outlet 26 may supply the working media from the tower distributor 14 to a plurality of outlet pipes 28 , which each deliver a portion of the working media to a burner.
  • the tower distributor 14 further comprises first and second circumferentially adjacent diverters 30 , 32 located between the inlet 24 and the outlet 26 .
  • the diverters 30 , 32 are affixed to an inner surface 34 of the wall structure 20 and are generally L-shaped in cross-section.
  • the diverters 30 , 32 define flow channels within the legs of the L-shape to effect a diversion of respective portions of the stream of working media, as will be discussed herein.
  • the diverters 30 , 32 extend axially downstream and circumferentially in opposite directions from one another along the inner surface 34 of the wall structure 20 from entrance portions 30 A, 32 A of the diverters 30 , 32 located at respective first positions to outlet portions 30 B, 32 B of the diverters 30 , 32 located at respective second positions downstream from the first positions in an axial direction of the tower distributor 14 (see FIG. 4 ).
  • the diverters 30 , 32 preferably extend at angles of about 35-55 degrees relative to the axial direction, and each diverter 30 , 32 preferably spans at least about 90° of an inner circumference of the wall structure 20 .
  • the entrance portions 30 A, 32 A of the diverters 30 , 32 are advantageously arranged near the inlet 24 of the tower distributor 14 , i.e., slightly downstream from the inlet 24 , at an area of working media concentration 40 (see also FIG. 1 ).
  • the area of working media concentration 40 comprises an area within the tower distributor 14 that has been found to comprise a higher allocation of pulverized coal than a remaining portion of tower distributor 14 at the same axial location as the area of working media concentration 40 . That is, as the stream of working media flows from the exhauster mill fan 12 toward the burners, the phenomenon of roping occurs, as discussed above.
  • the area of working media concentration 40 defines an area within the tower distributor 14 where the coal rope comprises a large amount of pulverized coal.
  • the diverters 30 , 32 redirect portions of the working media from the area of working media concentration 40 to the second positions at the respective diverter outlet portions 30 B, 32 B, as will be discussed herein.
  • the area of working media concentration 40 is located in close proximity to the inlet 24 of the tower distributor 14 on a circumferentially opposed side of the wall structure 20 than the exhauster mill fan 12 .
  • a gap G having a component in the circumferential direction is formed between entrance portions 30 A, 30 B of the respective diverters 30 , 32 .
  • the circumferential component of the gap spans about 1-10% of the inner circumference of the wall structure 20 .
  • the tower distributor 14 further comprises first and second adjustable vane members 46 , 48 attached to the wall structure 20 , see FIGS. 2-4 .
  • the vane members 46 , 48 extend radially inwardly from the inner surface 34 of the wall structure 20 and each are associated with a corresponding handle 50 , 52 located outside of the tower distributor 14 , see also FIG. 1 .
  • the handles 50 , 52 can be manipulated from outside of the tower distributor 14 to adjust the orientation of the corresponding vane member 46 , 48 during operation of the power plant 10 to effect a change in flow direction of a portion of the working media flowing through the wall structure 20 near the corresponding vane member 46 , 48 , as will be discussed herein.
  • the handles 50 , 52 each have a plurality of preset positions, each preset position corresponding to a particular orientation of the corresponding vane member 46 , 48 .
  • the preset positions may be defined, for example, by a handle tine 50 A, 52 A ( FIGS. 3 and 4 ) engaged in one of a plurality of holes 55 formed in respective bars 54 A, 56 A of the handles 50 , 52 supported on the wall structure 20 .
  • the combinations of the first and second vane members 46 , 48 and their corresponding handles 50 , 52 are referred to herein as first and second vane assemblies 54 , 56 , see FIGS. 3 and 4 .
  • the first vane assembly 54 is located in the circumferential direction between the respective entrance portions 30 A, 32 A of the first and second diverters 30 , 32 , i.e., the first vane assembly 54 is generally circumferentially aligned with the gap G formed between the entrance portions 30 A, 32 A. Further, the first vane assembly 54 may be generally axially aligned with the outlet portions 30 B, 32 B of the first and second diverters 30 , 32 . As will be described herein, a portion of the working media that passes through the gap G flows toward the first vane member 46 , wherein the first vane member 46 may alter the direction of the portion of working media.
  • the second vane assembly 56 is located axially downstream from the first vane assembly 54 and is located in the circumferential direction generally midway between respective outlet portions 30 B, 32 B of the diverters 30 , 32 . Further, the second vane assembly 56 may be located axially downstream from the first vane assembly 54 and downstream from a radially outwardly tapered downstream end 21 of the first conduit 20 A. As will be described herein, the second vane member 48 may alter the direction of working media flowing nearby.
  • the tower distributor 14 further comprises first and second protuberances 60 , 62 , which are generally circumferentially aligned with and are downstream from the respective first and second vane members 46 , 48 in the embodiment shown.
  • the protuberances 60 , 62 extend radially inwardly from the wall structure 20 and include angled, lower surfaces 60 A, 60 B and 62 A, 62 B, see FIG. 4 .
  • the angled surfaces 60 A, 60 B and 62 A, 62 B deflect portions of the working media flowing by the protuberances 60 , 62 , as will be discussed herein.
  • coal and carrier air are delivered to the exhauster mill.
  • the exhauster mill pulverizes the coal and the exhauster mill fan 12 distributes the pulverized coal and the carrier air to the tower distributor 14 through the feed tubes 18 .
  • the stream of working media forms a coal rope in the tower distributor 14 , as described above.
  • the formation of the coal rope creates the area of working media concentration 40 near the inlet 24 of the tower distributor 14 on the opposite side of the wall structure 20 from the exhauster mill fan 12 .
  • Portions of the working media in the area of working media concentration 40 enter the flow channels defined by the diverters 30 , 32 at the respective diverter entrance portions 30 A, 32 A. These portions of the working media follow the flow channels defined by the diverters 30 , 32 around the inner circumference of the wall structure 20 and are released by the diverters 30 , 32 at the second positions by the diverter outlet portions 30 B, 32 B, i.e., the respective flows of working media are diverted by the diverters 30 , 32 .
  • the orientation of the second vane member 48 can be adjusted by the second handle 52 as needed to modify the flow angle of the working media.
  • a determination may be made for a desired angle of the second vane member 48 using an online monitoring system 70 , schematically shown in FIG. 1 .
  • the online monitoring system 70 may monitor conditions within the outlet pipes 28 .
  • the online monitoring system 70 may indicate that a higher percentage of the working media is passing into one or more of the outlet pipes 28 than one or more other ones of the outlet pipes 28 , in which case the second vane member 48 can be adjusted to modify the flow of the working media through the tower distributor 14 , thus effecting a change in the amount of working media passing into each of the respective outlet pipes 28 .
  • the online monitoring system 70 may monitor one or more operating conditions within the tower distributor 14 or within the outlet pipes 28 to determine the amount of working media passing into the outlet pipes 28 , as will be apparent to those skilled in the art.
  • the working media flows into the second protuberance 62 .
  • the angled surfaces 62 A, 62 B of the second protuberance 62 deflect the working media to further separate the flow of working media into substantially equal portions for delivery into the respective outlet pipes 28 .
  • the orientation of the first vane member 46 can be adjusted by the first handle 50 as needed to modify the flow angle of this portion of the working media.
  • a determination may be made for a desired angle of the first vane member 46 using the online monitoring system 70 , as described above.
  • the working media flows into the first protuberance 60 .
  • the angled surfaces 60 A, 60 B of the first protuberance 60 deflect the working media to further separate the flow of working media into substantially equal portions for delivery into the respective outlet pipes 28 .
  • the tower distributor 14 described herein is believed to deliver a substantially equal amount of working media to each of the outlet pipes 28 by changing the configuration of the coal rope, such that substantially equal amounts of working media are delivered to each of the respective burners.
  • a substantially equal amount of working media is believed to be supplied to the respective fuel injectors.
  • emission levels of unwanted products such as CO, NO x , and unburned carbon are believed to be reduced.
  • areas of high heat flux within the burners are believed to be reduced, since none of the burners have excessive amounts of pulverized coal.
  • air imbalance within the burners is believed to be minimized, thus substantially preventing high airflow velocities at fuel nozzle outlets and subsequent unstable combustion.
  • the tower distributor 14 of the present invention merely diverts portions of the working media flowing therethrough, and does not mechanically disrupt the flow of working media, a pressure drop of the working media effected by the tower distributor 14 is believed to be reduced, thus increasing the efficiency of the power plant 10 . Further, since the flow directing components within the tower distributor 14 do not directly impede the flow of the working media but rather redirect or divert the flow of working media, erosion damage to the flow directing components is believed to be reduced.
  • tower distributor 14 comprises two diverters 30 , 32 , two vane members 46 , 48 , and two protuberances 60 , 62 , it is noted that additional or fewer ones of these respective components could be included in the tower distributor 14 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
US13/277,526 2011-01-13 2011-10-20 Tower distribution in a coal burning power plant Abandoned US20120183913A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US13/277,526 US20120183913A1 (en) 2011-01-13 2011-10-20 Tower distribution in a coal burning power plant
MX2013008140A MX2013008140A (es) 2011-01-13 2011-12-12 Distribuidor de torre en una planta de energia de combustion de carbon.
PCT/US2011/064353 WO2012096742A2 (en) 2011-01-13 2011-12-12 Tower distributor in a coal burning power plant
EP11799935.9A EP2663808A2 (en) 2011-01-13 2011-12-12 Tower distributor in a coal burning power plant
RU2013137764/06A RU2552888C2 (ru) 2011-01-13 2011-12-12 Башенный распределитель на электростанции, работающей на угле (варианты)
KR1020137021256A KR101567286B1 (ko) 2011-01-13 2011-12-12 석탄 화력 발전소 내의 타워 분배기
JP2013548407A JP2014505226A (ja) 2011-01-13 2011-12-12 石炭火力発電設備のタワー型分配器
CA2824733A CA2824733A1 (en) 2011-01-13 2011-12-12 Tower distributor in a coal burning power plant
AU2011354664A AU2011354664B2 (en) 2011-01-13 2011-12-12 Tower distributor in a coal burning power plant
CN201180068392.XA CN103392096B (zh) 2011-01-13 2011-12-12 燃煤发电厂中的塔式分配器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161432338P 2011-01-13 2011-01-13
US13/277,526 US20120183913A1 (en) 2011-01-13 2011-10-20 Tower distribution in a coal burning power plant

Publications (1)

Publication Number Publication Date
US20120183913A1 true US20120183913A1 (en) 2012-07-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US13/277,526 Abandoned US20120183913A1 (en) 2011-01-13 2011-10-20 Tower distribution in a coal burning power plant

Country Status (10)

Country Link
US (1) US20120183913A1 (zh)
EP (1) EP2663808A2 (zh)
JP (1) JP2014505226A (zh)
KR (1) KR101567286B1 (zh)
CN (1) CN103392096B (zh)
AU (1) AU2011354664B2 (zh)
CA (1) CA2824733A1 (zh)
MX (1) MX2013008140A (zh)
RU (1) RU2552888C2 (zh)
WO (1) WO2012096742A2 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104501201B (zh) * 2014-12-15 2017-06-16 无锡宏大环保设备有限公司 工业窑炉燃烧器煤粉定量分配装置

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US554327A (en) * 1896-02-11 Xxorxwb
US6055914A (en) * 1997-12-09 2000-05-02 Sure Alloy Steel Corporation Pre-riffle box mixing device for coal-fired power plant
US6494151B1 (en) * 2000-04-25 2002-12-17 Sure Alloy Steel Corporation Exhauster diffuser discharge valve
US20070095260A1 (en) * 2005-10-31 2007-05-03 Foster Wheeler Energy Corporation On-line adjustable coal flow distributing device
US20080202393A1 (en) * 2007-02-27 2008-08-28 Guido Gerhard Ulf Elsen Apparatus for Controlling or Regulating the Distribution of Particles in Dust or Granule Form in One or a Plurality of Carrier Gas Streams

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GB311872A (en) * 1928-03-22 1929-05-23 Edward William Green Improvements in and relating to the supply of pulverized fuel to burners
GB637319A (en) * 1947-07-01 1950-05-17 Thompson John Water Tube Boilers Ltd Improvements in or relating to pulverised fuel supply systems
DE954403C (de) * 1954-11-14 1956-12-13 Ver Kesselwerke Ag Vorrichtung zur gleichmaessigen Verteilung eines Foerdergutstromes in Rohrleitungen
FR2280017A1 (fr) * 1974-04-26 1976-02-20 Creusot Loire Dispositif repartiteur d'un courant fluide en plusieurs flux
JPH08303748A (ja) * 1995-05-01 1996-11-22 Mitsubishi Heavy Ind Ltd 粉粒体移送管保護装置
JPH0942649A (ja) * 1995-07-25 1997-02-14 Babcock Hitachi Kk 微粉炭輸送管ベンド
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US20030205183A1 (en) * 2002-05-01 2003-11-06 Wark Rickey E. Method and apparatus for promoting biaxially uniform particle size distribution in an airstream containing coal particles of mixed sizes
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Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US554327A (en) * 1896-02-11 Xxorxwb
US6055914A (en) * 1997-12-09 2000-05-02 Sure Alloy Steel Corporation Pre-riffle box mixing device for coal-fired power plant
US6494151B1 (en) * 2000-04-25 2002-12-17 Sure Alloy Steel Corporation Exhauster diffuser discharge valve
US20070095260A1 (en) * 2005-10-31 2007-05-03 Foster Wheeler Energy Corporation On-line adjustable coal flow distributing device
US20080202393A1 (en) * 2007-02-27 2008-08-28 Guido Gerhard Ulf Elsen Apparatus for Controlling or Regulating the Distribution of Particles in Dust or Granule Form in One or a Plurality of Carrier Gas Streams

Also Published As

Publication number Publication date
WO2012096742A2 (en) 2012-07-19
CN103392096A (zh) 2013-11-13
CA2824733A1 (en) 2012-07-19
AU2011354664A1 (en) 2013-07-11
JP2014505226A (ja) 2014-02-27
RU2552888C2 (ru) 2015-06-10
KR20130105913A (ko) 2013-09-26
WO2012096742A3 (en) 2013-11-07
RU2013137764A (ru) 2015-02-20
MX2013008140A (es) 2013-11-01
KR101567286B1 (ko) 2015-11-09
AU2011354664B2 (en) 2015-07-09
EP2663808A2 (en) 2013-11-20
CN103392096B (zh) 2016-04-06

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AS Assignment

Owner name: SIEMENS ENERGY, INC., FLORIDA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WHITE, DAVID C.;KAUSHANSKY, SERGEY;SHAN, JIEFENG;AND OTHERS;SIGNING DATES FROM 20111025 TO 20111026;REEL/FRAME:027153/0603

AS Assignment

Owner name: FOSTER WHEELER NORTH AMERICA CORP., NEW JERSEY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SIEMENS ENERGY, INC.;REEL/FRAME:034418/0314

Effective date: 20140919

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Owner name: AMEC FOSTER WHEELER NORTH AMERICA CORP., NEW JERSE

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Effective date: 20141124

STCB Information on status: application discontinuation

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