EP0129001B1 - Pulverized fuel burner nozzle tip and splitter plate therefor - Google Patents

Pulverized fuel burner nozzle tip and splitter plate therefor Download PDF

Info

Publication number
EP0129001B1
EP0129001B1 EP84102001A EP84102001A EP0129001B1 EP 0129001 B1 EP0129001 B1 EP 0129001B1 EP 84102001 A EP84102001 A EP 84102001A EP 84102001 A EP84102001 A EP 84102001A EP 0129001 B1 EP0129001 B1 EP 0129001B1
Authority
EP
European Patent Office
Prior art keywords
inner shell
trailing edge
furnace
coal
nozzle tip
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.)
Expired
Application number
EP84102001A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0129001A1 (en
Inventor
John Grusha
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.)
Combustion Engineering Inc
Original Assignee
Combustion Engineering 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 Combustion Engineering Inc filed Critical Combustion Engineering Inc
Publication of EP0129001A1 publication Critical patent/EP0129001A1/en
Application granted granted Critical
Publication of EP0129001B1 publication Critical patent/EP0129001B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/02—Structural details of mounting
    • F23C5/06—Provision for adjustment of burner position during operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner
    • 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
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10—Nozzle tips
    • F23D2201/101—Nozzle tips tiltable

Definitions

  • the present invention relates to improving the low load operation of fuel burners for use in pulverized coal-fired furnaces and, more particularly, to improving low load operation of fuel-air admission assemblies for directing a pulverized fuel-air mixture into the furnace by what is known as the tangential method of firing.
  • pulverized fuel such as coal in a conventional steam generator furnace
  • tangential firing One common method of firing a pulverized fuel such as coal in a conventional steam generator furnace is known as tangential firing.
  • pulverized coal is introduced to the furnace in a primary air stream through burners, termed fuel-air admission assemblies, located in the corners of the furnace.
  • the fuel-air streams discharged from these assemblies are aimed tangentially to an imaginary circle in the middle of the furnace. This creates a fireball which serves as a continuous source of ignition for the incoming coal.
  • Each fuel-air admission assembly is comprised of a fuel delivery pipe through which pulverized fuel entrained in air passes to the furnace, a secondary air conduit surrounding the fuel delivery pipe through which additional air is introduced into the furnace, and a nozzle tip which is pivotally mounted to the outlet end of the fuel delivery pipe.
  • a typical nozzle tip comprises inner and outer shells disposed coaxially in spaced relationship thereby defining a first flow passageway within the inner shell through which the pulverized fuel and air mixture discharging from the fuel delivery pipe passes into the furnace and a second flow passageway in the annular space between the inner and outer shells through which the secondary air discharging from the secondary air conduit passes into the furnace.
  • one or more splitter plates are disposed within the inner shell parallel to the axis of the nozzle tip to divide the flow passageway within the inner shell into multiple subpassages.
  • the nozzle tip may be tilted upward or downward in order to direct the fuel-air mixture, discharging into the furnace from the fuel delivery pipe upwardly or downwardly as a means controlling the temperature of the superheated steam produced in heat exchange surface typically disposed at the outlet of the surface in the manner taught by U.S. Patent 2,363,875.
  • a flame is established at one corner which in turn supplies the required ignition energy to stabilize the flame emanating from the corner downstream of and laterally adjacent to it.
  • the flames emanating from each corner become shorter and, as a consequence, a reduction in the amount of ignition energy available to the downstream corner occurs.
  • auxiliary fuel such as oil or natural gas must be introduced in each corner adjacent to the pulverized coal-air stream to provide additional ignition energy thereby insuring that a flameout and resultant unit trip will not occur.
  • This patent discloses an improved fuel-air admission assembly incorporating a split coal bucket which permits a pulverized coal-fired furnace to be operated at low loads without use of auxiliary fuel to provide stabilization.
  • the split coal bucket comprises independent upper and lower coal nozzles pivotally mounted to the coal delivery pipe, the upper and lower coal nozzles being independently tiltable.
  • the primary air and pulverized coal stream discharging from the coal delivery pipe is split into an upper and a lower coal-air stream and independently directed into the furnace by tilting the upper coal nozzle upward and the lower coal nozzle downward.
  • an ignition stabilizing pocket is established in the locally low pressure zone created in the void between the spread apart coal-air streams. Hot combustion products are drawn, i.e., recirculated into this low pressure zone, thus providing enough additional ignition energy to the incoming fuel to stabilize the flame.
  • German Patentschrift DE-C-913 092 also discloses a burner for pulverized coal having a bifurcated nozzle tip.
  • the pulverized coal and air mixture leaving the fuel supply pipe passes into a burner nozzle which is bifurcated into two vertically elongated and parallel flow passages.
  • As the pulverized coal and air mixture passes through the nozzle it is divided into two streams as it passes through the side-by-side parallel flow passages formed in the nozzle tip to exit into the furnace as two vertically elongated flat side-by-side, spaced apart streams which will rejoin shortly downstream of the nozzle tip as the pulverized coal and air mixture diffuses as it passes into the furnace.
  • East German Patent DD-A-127,792 discloses a burner system for a pulverized coal fired furnace wherein the burners are disposed in the corners of the furnace and aimed toward the center of the furnace with each of the individual burners having an outlet which is bifurcated into two divergent channels which are directed into the furnace at different angles with the included angle therebetween preferably at an acute angle of twenty degrees.
  • the pulverized coal and air stream passing into the furnace from each corner burner will be directed into two streams, one of which appears to be aimed generally toward the center of the furnace and the other of which appears to be aimed more along the side walls of the furnace.
  • Each burner also is equipped with a distribution flap which may be used to distribute the pulverized coal and air mixture preferentially through either of the outlet channels of the burner.
  • German Patent DE-C-504,814 discloses a pulverized coal burner wherein a pair of diverging comb-like plates is disposed at the outlet of the burner so as to cause the pulverized coal and air mixture passing from the burner pipe to be spread out as it exits into the furnace.
  • Part of the pulverized coal and air mixture passing from the coal burner pipe passes through the spaces between the tines of the comb-like plates, the tines extending from the base of each plate over the length of each plate. Another portion passes along the surface of the tines to the outside. In this manner, the pulverized coal and air mixture leaving the burner pipe is split into several streams which are spread out over a wide area as the mixture passes over and through the comb-like plates into the furnace.
  • a nozzle tip is provided for a burner on a pulverized fuel fired furnace.
  • the nozzle tip is of the type having an open-ended inner shell having an inlet end and an outlet end and defining therebetween a flow passageway through which a mixture of pulverized fuel and transport air passes from the burner into the furnace, an open-ended outer shell spaced from and surrounding the inner shell thereby defining an annular flow passageway therebetween through which additional air passes from the burner into the furnace, and first and second splitter plates disposed within the inner shell for dividing the flow passageway therethrough into a first flow passage and a second flow passage extending from the inlet end of the inner shell to the outlet end thereof in a diverging manner with a void region established therebetween through which flow is precluded.
  • Each splitter plate has a leading edge portion disposed transversely across the flow passageway of the inner shell at the inlet end thereof and a trailing edge portion extending transversely across the flow passageway of the inner shell at the outlet end thereof.
  • the first and second splitter plates converge at the inlet of the inner shell and extending outwardly therefrom in a diverging manner toward the outlet end of the inner shell thereby dividing the flow passageway through the inner shell into the first flow passage bounded by the first splitter plate and the inner shell and the second flow passage bounded by the second splitter plate and said inner shell.
  • the first and second flow passages diverge in the direction of flow through the nozzle tip and are separated by a void region established between the first and second divergent splitter plates through which flow is precluded.
  • the nozzle tip of the present invention is characterized in that the trailing edge portion of each of said first and second splitter plates is scalloped by forming the trailing edge portion of each of said first and second splitter plates of a plurality of longitudinally elongated strips extending longitudinally outward from the leading edge portion of each of said first and second splitter plates in side-by-side relationship transversely across the flow passageway of said inner shell, with a first portion of said trailing edge strips disposed alternately between a second portion of said trailing edge strips and bent in a first direction radially away from the leading edge portion of each of said first and second splitter plates and with the second portion of said trailing edge strips bent radially away from the leading edge portion of each of said first and second splitter plates in a second direction opposite to the first direction in which the first portion of said trailing edge strips are bent radially away from the leading edge portion of each of said first and second splitter plates.
  • the nozzle tip according to Claim 2 is further characterized by a plurality of filler plates which may be disposed transversely between adjacent first and second portions of said trailing edge strips along the interface therebetween thereby precluding the flow of pulverized fuel and transport air across the interface formed between adjacent diverging first and second portions of said trailing edge strips.
  • the coal-air mixture discharging from the burner is split by the plate means into a first stream which is directed into the furnace through the first flow passageway through the inner shell and a second stream which is directed into the furnace through the second flow passageway of the inner shell.
  • the coal-air mixture is directed into the furnace in two diverging streams.
  • an ignition stabilizing pocket is established in the locally low pressure zone created between the spread apart and diverging coal-air streams in the furnace just downstream of the void region established between the diverging first and second flow passageways through the inner shell of the nozzle tip. Coal is concentrated in this pocket and hot combustion products are drawn back into the pocket from the flame to provide additional ignition energy to the incoming fuel to stabilize the flame.
  • the scalloped edges provided along the trailing edge portions of the splitter plates serve to generate turbulence along the boundaries between the fuel-air streams discharging from the divergent flow passages and the void region established therebetween whereby the mixing of pulverized fuel and hot combustion products drawn into the low pressure recirculation zone formed in the furnace just downstream of the void region of the nozzle tip thereby further stabilizing ignition.
  • a plurality of coal-air admission assemblies 10 are arranged in the corners of the furnace in a vertical column separated by auxiliary air compartments 20 and 20'.
  • auxiliary air compartments 20 and 20' are adapted to accommodate an oil or gas burner 22, which is used when starting and warming up the boiler and which, in the prior art, is used when necessary to provide additional ignition energy to stabilize the coal flame when operating the furnace at low loads.
  • Each coal-air admission assembly 10 comprises a coal delivery pipe 12 extending therethrough and opening into the furnace, and a secondary air conduit 14 which surrounds coal delivery pipe 12 and opens into an air supply plenum 18, termed a windbox.
  • Pulverized coal entrained in transport air is discharged into the furnace through the coal delivery pipes 12 from a supply source such as a pulverizer wherein the coal is dried and comminuted.
  • Secondary air is passed into the furnace through the secondary air conduits 14 as a stream surrounding the pulverized coal and transport air stream discharged from each coal delivery pipe 12. Additional combustion air is passed into the furnace from windbox 18 through the auxiliary air compartments 20.
  • Each coal delivery pipe 12 is provided with a nozzle tip, often referred to as a coal bucket, which is pivotally mounted to the coal delivery pipe 12 so that the nozzle tip may be tilted about an axis 16 transverse to the longitudinal axis of the coal delivery pipe 12 in order to direct the pulverized coal and air mixture into the furnace at either an upward angle or a downward angle as a means of controlling the position of the fire ball within the furnace whereby the temperature of the superheat steam leaving the steam generator, not shown, is controlled in the manner taught-by U.S. Patent 2,363,875 issued November 28, 1944 to Kreisinger et al for "Combustion Zone Control".
  • Nozzle tips 28, shown in Figure 2 are typical of the standard prior art nozzle tip commonly mounted to the coal delivery pipe 12.
  • the typical prior art nozzle tip 28 is comprised of an open-ended inner shell defining therethrough a flow passageway through which the mixture of pulverized coal and transport air passes from the coal delivery pipe 12 into the furnace surrounded by an open-ended outer shell spaced therefrom so as to define an annular flow passage therebetween through which secondary air passes from the secondary air conduit 14 into the furnace.
  • the inner and outer shell are adapted to be mounted to the outlet end of the coal delivery pipe 12 by means of a pivot pin so as to be tiltable about axis 16.
  • one or more baffle plates 26 are disposed within the inner shell of the prior art nozzle tip 28 along an axis parallel to the nozzle tip and the coal delivery pipe 12 so as to form two or more parallel flow passages within the inner shell through which the pulverized coal and air passes from the coal delivery pipe 12 into the furnace as a single stream subdivided into one or more parallel and contiguous substreams.
  • ignition became unstable and supplemental fuel, such a natural gas or oil, had to be fired in order to provide sufficient additional ignition energy to stabilize the ignition of the single coal-air streams discharging from nozzle tips 28.
  • Nozzle tip 30 which inherently provides improved ignition stability - during low load operation.
  • Nozzle tip 30 comprises an open-ended inner shell 32, an open-ended outer shell 34 spaced from and surrounding the inner shell 32, and plate means 40 disposed within the inner shell for dividing the interior of the inner shell into first and second flow passageway.
  • the inner shell 32 has an outlet end 36 opening into the furnace and an inlet end 38 adapted to be mounted about the outlet end of the coal delivery pipe 12 so as to receive the pulverized coal and air discharging therefrom.
  • An annular flow passageway 50 is defined between the inner shell 32 and the outer shell 34 through which additional combustion air passes from the secondary air conduit 14 into the furnace.
  • plate means 40 is disposed within the inner shell 32 for dividing the flow passage therethrough into first and second flow passages 52 and 54, respectively, extending from the inlet end 38 of the inner shell 32 to the outlet end 36 thereof in a diverging manner with a void region 56 established therebetween through which flow is precluded.
  • the nozzle tip accomplishes the desired objective of improving ignition stability at low load operation by providing two separate and distinct diverging flow passages 52 and 54 through the inner shell 32 which are spaced to lie above and below a central void 56 through which flow is precluded.
  • the stream of pulverized fuel and transport air discharging from the coal delivery pipe 12 into the nozzle tip 30 will be split into two portions.
  • a low pressure zone 80 which serves as an ignition stabilizing region, will be created in the furnace at the outlet of the nozzle tip 30 downstream of the void region 56 between the diverging coal-air streams 60 and 70. Coal particles from the streams 60 and 70 will be drawn into the low pressure zone 80 from the diverging coal-air streams 60 and 70.
  • Ignition will be stabilized because a portion of the hot combustion products formed during the ignition process are recirculated within the low pressure ignition stabilizing zone 80, thereby providing sufficient ignition energy for igniting coal particles which are subsequently drawn into the zone 80 from the diverging coal-air streams 60 and 70.
  • the plate means 40 comprises first and second splitter plates 41 and 42 disposed within the inner shell 32 so as to divide the interior of the inner shell 32 into a first flow passage 52 bounded by the first splitter plate 41 and the inner shell 32 and a second flow passage 54 bounded by the second splitter plate 42 and the inner shell 32.
  • Each of the splitter plates 41 and 42 has a leading edge portion 43 disposed transversely across the flow passage of the inner shell 32 at the inlet end 38 thereof and a trailing edge portion 44 extending transversely across the flow passage of the inner shell 32 at the outlet end 36 thereof.
  • the first and second splitter plates 41 and 42 converge along the line at the inlet end 38 of the inner shell 32 and extend outwardly therefrom in a diverging manner, preferably at an included angle of approximately 20°, toward the outlet end 36 of the inner shell 32 and defined therebetween a void region 56 through which flow is precluded.
  • the trailing edge portion 44 of the first and second splitter plates 41 and 42 is scalloped as best seen in Figures 4, 5 and 6.
  • the trailing edge portion 44 thereof comprises a plurality of longitudinally elongated strips extending longitudinally outward from the leading edge portion 43 of the splitter plates in side-by-side relationship transversely across the flow passageway of the inner shell 32.
  • a first portion 45 of the trailing edge strips extending longitudinally outward from the leading edge portion of the first and second splitter plates is disposed alternately across the inner shell 32 between a second portion 47 of the trailing edge strips and are bent radially away from the second portion 47 of the trailing edge strips thereby forming the desired scalloped trailing edge on the splitter plates 41 and 42.
  • the first portion 45 of the trailing edge strips are bent radially away from the leading edge portion 43 of each splitter plate in one direction while the second portion 47 of the trailing edge strips is bent radially away from the leading edge portion 43 of each of the splitter plates in the direction opposite to that in which the first portion 45 are bent.
  • a turbulent zone is established along the interface between each of the coal-air streams 60 and 70 in the low pressure recirculation zone 80 formed therebetween.
  • Such a turbulent interface insures that coal and air will be drawn out of the coal-air streams and mixed thoroughly with hot ignition products in the low pressure recirculation zone 80 thereby further enhancing ignition stability. It is preferable to provide filler plates 46 which
  • the splitter plates 41 and 42 are arranged within the inner shell 32 of the nozzle tip 30 so that the scalloped trailing edge portions thereof are disposed in an in-line arrangement as shown in Figure 5 or a staggered arrangement as shown in Figure 6.
  • splitter plates 41 and 42 are shown in the drawing as being fabricated of various pieces of plate metal welded together, it is to be understood that the splitter plates 41 and 42 may also be readily manufactured by well-known casting processes. Additionally, it is to be appreciated that the lifetime of the splitter plates within the coal flow passage through the inner shell 32 may be enhanced in accordance with the teachings of U.S. Patent 4,356,975 issued November 2, 1982 to Chadshay for "Nozzle Tip for pulverized Coal Burner" by manufacturing the splitter plates 41 and 42 with their leading edge portion 43 formed of a relatively abrasion resistant material such as silicon carbide or Ni-hard, and their trailing edge portion 44 formed of a material relatively resistant to high temperatures such as certain well known stainless steels.
  • a relatively abrasion resistant material such as silicon carbide or Ni-hard

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
EP84102001A 1983-04-22 1984-02-25 Pulverized fuel burner nozzle tip and splitter plate therefor Expired EP0129001B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48755283A 1983-04-22 1983-04-22
US487552 1983-04-22

Publications (2)

Publication Number Publication Date
EP0129001A1 EP0129001A1 (en) 1984-12-27
EP0129001B1 true EP0129001B1 (en) 1988-06-15

Family

ID=23936209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102001A Expired EP0129001B1 (en) 1983-04-22 1984-02-25 Pulverized fuel burner nozzle tip and splitter plate therefor

Country Status (10)

Country Link
EP (1) EP0129001B1 (ko)
JP (1) JPS59205510A (ko)
KR (1) KR890000326B1 (ko)
AU (1) AU567340B2 (ko)
CA (1) CA1230783A (ko)
DE (1) DE3472154D1 (ko)
ES (1) ES531781A0 (ko)
IN (1) IN161339B (ko)
MX (1) MX158316A (ko)
ZA (1) ZA841738B (ko)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2791029B2 (ja) * 1988-02-23 1998-08-27 バブコツク日立株式会社 微粉炭バーナ
FR2689211B1 (fr) * 1992-03-30 1994-05-06 Stein Industrie Busette orientable en materiau refractaire pour injection d'air et de combustible dans les bruleurs de chaudieres de centrales thermiques.
US5315939A (en) * 1993-05-13 1994-05-31 Combustion Engineering, Inc. Integrated low NOx tangential firing system
GB9322016D0 (en) * 1993-10-26 1993-12-15 Rolls Royce Power Eng Improvements in or relating to solid fuel burners
CA2167341C (en) * 1995-01-17 2000-03-21 Joel Vatsky Tiltable split stream burner assembly with gasket seal
KR100325948B1 (ko) * 1999-04-22 2002-02-27 김병두 보일러의 미분탄 공급 노즐팁 어셈블리
JP5271680B2 (ja) * 2008-12-05 2013-08-21 三菱重工業株式会社 旋回燃焼ボイラ
JP2010139182A (ja) * 2008-12-12 2010-06-24 Mitsubishi Heavy Ind Ltd 旋回燃焼ボイラ
JP5344898B2 (ja) * 2008-12-12 2013-11-20 三菱重工業株式会社 旋回燃焼ボイラ
JP5344897B2 (ja) * 2008-12-12 2013-11-20 三菱重工業株式会社 旋回燃焼ボイラ
JP2011127836A (ja) * 2009-12-17 2011-06-30 Mitsubishi Heavy Ind Ltd 固体燃料焚きバーナ及び固体燃料焚きボイラ
JP5374404B2 (ja) * 2009-12-22 2013-12-25 三菱重工業株式会社 燃焼バーナおよびこの燃焼バーナを備えるボイラ
CN101718431B (zh) * 2009-12-28 2011-03-23 上海交通大学 电站燃煤锅炉直流燃烧器喷口结构
EP3279562B1 (en) * 2015-03-31 2020-08-19 Mitsubishi Hitachi Power Systems, Ltd. Combustion burner and boiler
WO2016158081A1 (ja) 2015-03-31 2016-10-06 三菱日立パワーシステムズ株式会社 燃焼バーナ及びこれを備えたボイラ
JP6632841B2 (ja) * 2015-09-11 2020-01-22 三菱日立パワーシステムズ株式会社 燃焼バーナ及びこれを備えたボイラ
JP6642912B2 (ja) 2015-09-11 2020-02-12 三菱日立パワーシステムズ株式会社 燃焼バーナ及びこれを備えたボイラ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE504814C (de) * 1927-04-12 1930-08-08 Adolf Steinbrueckner Kohlenstaubbrenner mit Zusatzluftzufuehrung und mit innerem Verteilkoerper fuer das Brennstoffluftgemisch
US2608168A (en) * 1949-10-21 1952-08-26 Comb Eng Superheater Inc Dual nozzle burner for pulverized fuel
DE913092C (de) * 1951-04-06 1954-06-08 Kohlenscheidungs Ges Mit Besch Brenner fuer Kohlenstaub od. dgl. feinverteilten Brennstoff
DD127792A1 (de) * 1976-08-20 1977-10-12 Gerd Boche Kohlenstaubbrenner,insbesondere fuer dampferzeuger
US4252069A (en) * 1979-04-13 1981-02-24 Combustion Engineering, Inc. Low load coal bucket
JPS5735366A (en) * 1980-07-03 1982-02-25 Nec Corp Semiconductor integrated circuit device

Also Published As

Publication number Publication date
CA1230783A (en) 1987-12-29
EP0129001A1 (en) 1984-12-27
AU567340B2 (en) 1987-11-19
JPS59205510A (ja) 1984-11-21
KR890000326B1 (ko) 1989-03-14
IN161339B (ko) 1987-11-14
DE3472154D1 (en) 1988-07-21
AU2711584A (en) 1984-10-25
MX158316A (es) 1989-01-23
ES8503424A1 (es) 1985-02-16
JPH0225086B2 (ko) 1990-05-31
ZA841738B (en) 1984-10-31
KR840008492A (ko) 1984-12-15
ES531781A0 (es) 1985-02-16

Similar Documents

Publication Publication Date Title
US4634054A (en) Split nozzle tip for pulverized coal burner
EP0129001B1 (en) Pulverized fuel burner nozzle tip and splitter plate therefor
US4252069A (en) Low load coal bucket
EP2267365B1 (en) Low NOx nozzle tip for a pulverized solid fuel furnace
US4501204A (en) Overfire air admission with varying momentum air streams
AU762789B2 (en) Method of operating a tangential firing system
CA2487215C (en) Solid fuel burner, solid fuel burner combustion method, combustion apparatus and combustion apparatus operation method
US4434727A (en) Method for low load operation of a coal-fired furnace
US4274343A (en) Low load coal nozzle
PL185103B1 (pl) Sposób spalania mieszanki paliwowej w strumieniu powietrza i palnik do spalania mieszanki paliwowej w strumieniu powietrza
EP0029084A2 (en) Apparatus for tilting low-load pulverized-coal nozzles
JPS6159109A (ja) 固体化石燃料の粉砕粒子のための点火―燃焼維持用バーナ及び当該バーナを有する燃焼室
EP0284629B1 (en) Dust coal igniting burner device
US4570549A (en) Splitter for use with a coal-fired furnace utilizing a low load burner
EP3249294B1 (en) Nozzle tip of pulverized coal burner
US6105516A (en) Burner nozzle for pulverized coal
EP0017721B1 (en) Low load coal bucket and method of operating a pulverised coal-fired furnace
US20230213185A1 (en) Combustion system for a boiler with fuel stream distribution means in a burner and method of combustion
JP2954628B2 (ja) 微粉炭バーナ
JPH08135920A (ja) 微粉炭バーナ
US20200292167A1 (en) Combustion system with wide turndown coal burner
PL170716B1 (pl) Układ do niskoemisyjnego spalania pyłu węglowego w kotłach energetycznych z palnikami strumieniowymi

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19850304

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT NL SE

REF Corresponds to:

Ref document number: 3472154

Country of ref document: DE

Date of ref document: 19880721

ITF It: translation for a ep patent filed

Owner name: ING. ZINI MARANESI & C. S.R.L.

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19890105

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900226

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19911223

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19920107

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920229

Year of fee payment: 9

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19930228

BERE Be: lapsed

Owner name: COMBUSTION ENGINEERING INC.

Effective date: 19930228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930901

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19931029

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19941230

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19941231

Year of fee payment: 12

EUG Se: european patent has lapsed

Ref document number: 84102001.9

Effective date: 19901107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960225

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19961101