EP3249294A1 - Bec de tuyère de brûleur de charbon pulvérisé - Google Patents

Bec de tuyère de brûleur de charbon pulvérisé Download PDF

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Publication number
EP3249294A1
EP3249294A1 EP16204468.9A EP16204468A EP3249294A1 EP 3249294 A1 EP3249294 A1 EP 3249294A1 EP 16204468 A EP16204468 A EP 16204468A EP 3249294 A1 EP3249294 A1 EP 3249294A1
Authority
EP
European Patent Office
Prior art keywords
nozzle tip
tubular body
pulverized coal
inner tubular
passage
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.)
Granted
Application number
EP16204468.9A
Other languages
German (de)
English (en)
Other versions
EP3249294B1 (fr
Inventor
Kyoung Taek Oh
Byoung Hwa Lee
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.)
Doosan Heavy Industries and Construction Co Ltd
Original Assignee
Doosan Heavy Industries and Construction Co Ltd
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 Doosan Heavy Industries and Construction Co Ltd filed Critical Doosan Heavy Industries and Construction Co Ltd
Publication of EP3249294A1 publication Critical patent/EP3249294A1/fr
Application granted granted Critical
Publication of EP3249294B1 publication Critical patent/EP3249294B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20—Fuel flow guiding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/30—Wear protection

Definitions

  • Exemplary embodiments of the present invention relate to a nozzle tip of a pulverized coal burner, and more particularly, to a nozzle tip of a pulverized coal burner, which is capable of preventing the abrasion and separation of flame stabilizers due to the flow of pulverized coal.
  • the nozzle tip of a coal burner is generally disposed at a corner within a combustion chamber.
  • the direction of the nozzle tip of the coal burner may vary when the boiler is operated.
  • the flame temperature in the combustion chamber may be regulated by changing the direction of the nozzle tip in the upward and downward directions
  • the supply direction of coal as fuel may vary by changing the nozzle tip in the clockwise or counterclockwise direction of flame in the state in which the nozzle tip is away from the center of the combustion chamber.
  • Fig. 1 is a perspective view illustrating the state in which a conventional nozzle tip is installed at the end of a fuel pipe.
  • Fig. 2 is a perspective view for explaining the configuration of the conventional nozzle tip.
  • Fig. 3 is a cross-sectional view of Fig. 2 .
  • a nozzle tip 20 is installed at the end of a fuel pipe 10, and the nozzle tip 20 has driver holes 14 and 16 formed at one side thereof so that an actuator is connected to the driver holes 14 and 16.
  • the nozzle tip may vertically move about a bent shaft 12 by the operation of the actuator.
  • the nozzle tip may consist of a plurality of nozzle tips arranged in the combustion chamber in a coal burner. Only some of the nozzle tips are employed and the remaining nozzle tips may be used as spare parts.
  • the nozzle tip 20 Since the nozzle tip 20 is directly exposed to the combustion chamber, the nozzle tip 20 has a dual wall for an improvement in durability. Coal is supplied to the internal space of the nozzle tip, and a portion of air for combustion is supplied outside the internal space (to the space between the inside and the outside).
  • an outer tubular body 40 is disposed outside an inner tubular body 30, guide blades 50 are disposed inside the inner tubular body 30, and share bars 60 are disposed at the sides of the inner surface of the inner tubular body 30.
  • a gap member is disposed between the inner tubular body 30 and the outer tubular body 40 to define a space portion.
  • one side of the inner tubular body 30 is connected to the end of the fuel pipe 10 by the bent shaft 12, with the consequence that the nozzle tip is assembled to the fuel pipe so as to bend the direction of the nozzle tip.
  • the inner and outer tubular bodies 30 and 40 form a square tubular body by welding the corners of four inner and outer panels.
  • the share bars 60 serve to pull flame toward the nozzle tip 20 by swirling air and pulverized coal.
  • the share bars 60 are constituted as a single body and each has an elongated rectangular shape.
  • one surface of the share bar 60 is fixed to the inner surface 32 of the inner tubular body 30 by welding (W), and particularly the respective share bars 60 are fixedly coupled to the front ends of the upper and lower sides of the inner tubular body 30.
  • each of the share bars 60 may be partially or entirely worn due to the collision with pulverized coal flowing by the guide blades 50.
  • the welded portions of the share bars 60 may be cracked due to the radiant heat, resulting in the separation of the share bars from the nozzle tip.
  • the nozzle tip may not perform the specific function thereof.
  • the share bars lose an original function for pulling flame toward the nozzle tip.
  • NOx nitrogen oxide
  • An object of the present invention is to provide a nozzle tip of a pulverized coal burner, which is capable of preventing the abrasion and separation of flame stabilizers due to the flow of pulverized coal.
  • a nozzle tip of a pulverized coal burner which includes an inner tubular body having a first passage in which pulverized coal introduced into the inner tubular body flows, an outer tubular body installed outside the inner tubular body while being spaced apart therefrom, and at least one guide plate installed to partition the first passage, includes a plurality of flame stabilizers arranged in a row at the and/or lower sides in the inner tubular body, wherein each of the flame stabilizers has an inclined surface formed on a side thereof facing a direction in which the pulverized coal flows in the first passage, the inclined surface being inclined toward a central portion of the inner tubular body.
  • the flame stabilizers may be arranged at the front side of the nozzle tip.
  • the flame stabilizers may be arranged being spaced apart from each other with a predetermined distance to the adjacent flame stabilizer on the upper and/or lower side of the inner tubular body.
  • the distance is smaller than the width of the flame stabilizers.
  • the flame stabilizers may be arranged in a row at each of the upper and the lower side in the inner tubular body.
  • the inclined surface may be formed such that the first passage is narrowed in the flow direction of the pulverized coal.
  • each of the flame stabilizers may include a flame stabilizer fixing portion fixed into the inner tubular body, and a wear-resistant member detachably coupled to a side of the flame stabilizer fixing portion facing the direction in which the pulverized coal flows in the first passage, and the wear-resistant member may have an inclined surface formed such that the first passage is narrowed in the direction in which the pulverized coal flows in the first passage.
  • the inclined surface may be a flat surface.
  • the inclined surface may form an angle of 30 to 50° with an inner surface of the inner tubular body.
  • the inclined surface may be a curved surface.
  • the inclined surface may have a quadrant shape that is concave toward the central portion of the inner tubular body.
  • Fig. 4 is a perspective view illustrating a nozzle tip of a pulverized coal burner according to a first embodiment of the present invention.
  • Fig. 5 is a cross-sectional view of Fig. 4 .
  • Fig. 6 is a perspective view illustrating a nozzle tip of a pulverized coal burner according to a second embodiment of the present invention.
  • Fig. 7 is a cross-sectional view of Fig. 6 .
  • Fig. 8 is a perspective view illustrating a nozzle tip of a pulverized coal burner according to a third embodiment of the present invention.
  • Fig. 9 is a perspective view illustrating a nozzle tip of a pulverized coal burner according to a fourth embodiment of the present invention.
  • Fig. 10 is a view illustrating the flow temperature distribution in the conventional nozzle tip.
  • Fig. 11 is a view illustrating the flow temperature distribution in the nozzle tip of a pulverized coal burner according to the first embodiment of the present invention
  • a coal-fired thermal power plant produces electric power using heat generated by burning pulverized coal.
  • a coal pulverizer pulverizes coal in a particle form to produce pulverized coal, and supplies the pulverized coal to a damper through a conduit.
  • the pulverized coal is mixed with air at a certain ratio in the damper, and the mixed pulverized coal and air are supplied into a furnace.
  • the water in a water pipe is vaporized by the combustion of the pulverized coal supplied to the furnace, and electric power is produced by rotating a turbine using the water vapor.
  • a burner nozzle tip corresponds to the end portion of a transfer device that supplies the mixed pulverized coal and air into the furnace, and the burner nozzle tip generally consists of a plurality of nozzle tips installed in the furnace.
  • nozzle tip according to exemplary embodiments of the present invention is described below as being used in the furnace of the coal-fired thermal power plant, the present invention is not limited thereto.
  • the nozzle tip may be applied to all types of burners to which fuel is supplied.
  • the nozzle tip of a pulverized coal burner generally includes an inner tubular body 100, an outer tubular body 200, at least one guide plate 300, and a plurality of flame stabilizers 400.
  • the inner tubular body 100 and the outer tubular body 200 which is installed outside the inner tubular body 100 while being spaced apart therefrom, form a dual wall.
  • a spacer is disposed between the inner and outer tubular bodies 100 and 200 so that they may be maintained in the state in which they are spaced apart from each other.
  • Each of the inner and outer tubular bodies 100 and 200 may have any tubular shape so as to serve as a passage for the flow of fluid.
  • the inner tubular body 100 forms a square tubular body by welding a plurality of inner panels
  • the outer tubular body 200 forms a square tubular body by welding a plurality of outer panels.
  • the side in which pulverized coal is introduced into the inner tubular body 100 will be referred to as a "rear”
  • the side in which the introduced pulverized coal is discharged from the inner tubular body 100 will be referred to as a "front”
  • the inner tubular body 100 has a first passage 120 which is formed in forward and rearward directions therein so that pulverized coal is introduced into and flows in the first passage 120.
  • the pulverized coal and air introduced rearward through the first passage 120 are discharged forward, and flame is formed close to the front of the first passage 120.
  • air may be supplied by the outer tubular body 200 in a flame direction in a second passage 220 which is formed between the outer and inner tubular bodies.
  • a bent shaft (not shown) may be installed to one side of the outer portion of the inner tubular body 100 so as to be installed to a fuel pipe.
  • the flame in a furnace may be adjusted by changing the discharge direction of pulverized coal in upward and downward directions depending on the temperature in the furnace.
  • a cover tubular body may be coupled to the fuel pipe at the rear of the outer tubular body 200 so as to cover a portion of the fuel pipe.
  • the guide plate 300 may be horizontally installed inside the inner tubular body 100, in order to guide the introduction direction of pulverized coal and partition the first passage 120.
  • the guide plate 300 allows the mixture of pulverized coal and air discharged from the inner tubular body 100 to uniformly flow. When pulverized coal is discharged from the nozzle tip in the upward or downward direction, the guide plate 300 may prevent the mixture of pulverized coal and air from being concentrated upward or downward in the first passage 120.
  • the flame stabilizers 400 are arranged in a row at each of upper and lower sides in the inner tubular body 100.
  • the flame stabilizers 400 may be installed at the front ends of the inner tubular body 100, to which pulverized coal is discharged through the first passage 120, in order to actively mix fuel and oxidizer and perform advanced ignition.
  • the flame stabilizers 400 serve to pull flame toward the nozzle tip by swirling air and pulverized coal.
  • the number of flame stabilizers may vary according to the size of the nozzle tip, and is preferably two to six. Seven or more flame stabilizers may be provided. However, if the number of flame stabilizers is more than enough, it may take a lot of time and labor to manufacture the nozzle tip. Therefore, it is preferable to provide an adequate number of flame stabilizers.
  • the flame stabilizers 400 may be fixed to the inner surface of the inner tubular body 100 by welding or by separate members such as bolts.
  • the inner tubular body is formed with holes for the installation of the flame stabilizers, and the flame stabilizers are formed with holes at positions corresponding to the holes of the inner tubular body. Subsequently, after pins are simultaneously inserted into the holes of the inner tubular body and the holes of the flame stabilizers, the flame stabilizers may be coupled to the inner tubular body by welding the flame stabilizers to the inner tubular body and welding the pins to the outside of the inner tubular body.
  • each of the flame stabilizers 400 is preferably made of a material having high durability to abrasion and damage, and may be made of a high-hardness material such as ceramic or cemented carbide.
  • the ceramic may include, for example, silicon carbide, alumina, and a mixture of alumina and zirconia, and the cemented carbide may include, for example, tungsten carbide (WC).
  • WC tungsten carbide
  • the present invention is not limited thereto.
  • the pulverized coal mixed with air flows at a high speed in the first passage 120 of the inner tubular body, and thus pulverized coal particles collide with the flame stabilizers 400.
  • each of the flame stabilizers 400 has an inclined surface 420 which is formed on the side thereof facing the direction in which pulverized coal flows in the first passage 120 so as to be inclined toward the central portion of the inner tubular body 100.
  • the inclined surface 420 is formed on the rear side of the flame stabilizer 400.
  • the inclined surface 420 is formed on the side of the flame stabilizer 400, which collides with pulverized coal, the pulverized coal collides obliquely instead of vertically with the rear side of the flame stabilizer 400. Consequently, the momentum of pulverized coal particles may be dispersed and the wear resistance of the flame stabilizer may be enhanced.
  • Fig. 10 is a view illustrating the flow temperature distribution in the conventional nozzle tip.
  • Fig. 11 is a view illustrating the flow temperature distribution in the nozzle tip of a pulverized coal burner according to the first embodiment of the present invention.
  • the temperature around the side of the flame stabilizer facing the flow direction of pulverized coal is very high due to collision since the rear side of the flame stabilizer is vertically formed.
  • the temperature of the rear side of the flame stabilizer is not high.
  • the conventional nozzle tip is exposed to high-temperature environment for a long time, various ingredients of pulverized coal flowing in the first passage are affected by high temperature. For this reason, the pulverized coal may be attached to the inner surface of the inner tubular body or the flame stabilizer, and hence a slagging phenomenon may occur.
  • the inclined surface 420 is a flat surface. Specifically, the front side of the flame stabilizer 400 forms an angle of 90° with the inner surface of the inner tubular body 100, and the inclined surface 420 is inclined such that the width of the flame stabilizer is narrowed toward the central portion of the inner tubular body 100 from the inner surface thereof in the cross-section of the nozzle tip.
  • the inclined surface 420 preferably forms an angle of 30 to 50° with the inner surface of the inner tubular body 100.
  • the angle is less than 30°, the inclined surface is elongated.
  • the momentum of pulverized coal particles may not be effectively dispersed in the event that the inclined surface collides with pulverized coal flowing in the first passage 120.
  • the flame stabilizer 400 has a wide area compared to the conventional flame stabilizer having a rectangular plate shape and is fixed to the inner surface of the inner tubular body 100, it is possible to prevent the separation of the flame stabilizer due to abrasion.
  • each of flame stabilizers includes a flame stabilizer fixing portion 3400 which is fixed into an inner tubular body and a wear-resistant member 3500 which is detachably coupled to the side of the flame stabilizer fixing portion 3400, facing the direction in which pulverized coal flows in a first passage 120.
  • the wear-resistant member 3500 may have an inclined surface 3520 formed such that the first passage 120 is narrowed in the direction in which pulverized coal flows in the first passage 120.
  • the flame stabilizer may have a structure in which the wear-resistant member 3500, having the inclined surface 3520 formed such that the first passage 120 is narrowed in the direction in which pulverized coal flows in the first passage 120, is detachably coupled to the flame stabilizer fixing portion 3400 having a conventional elongated rectangular plate shape as illustrated in Fig. 3 .
  • the wear-resistant member 3500 is detachably coupled to the side of the flame stabilizer fixing portion 3400, facing the direction in which pulverized coal flows in the first passage 120.
  • the inclined surface 3520 of the wear-resistant member, with which pulverized coal collides is formed on the side of the flame stabilizer fixing portion 3400, with which pulverized coal does not directly collide, the pulverized coal collides obliquely instead of vertically with the rear side of the wear-resistant member 3500. Consequently, the momentum of pulverized coal particles may be dispersed and the wear resistance of the flame stabilizer may be enhanced, similar to the first embodiment.
  • the wear-resistant member 3500 since the wear-resistant member 3500 is detachably coupled to the flame stabilizer fixing portion 3400, the wear-resistant member 3500 may be attached to the conventional flame stabilizer. Thus, only the wear-resistant member may be replaced to thereby reduce replacement costs, and the function of the flame stabilizer may be consistently maintained during the replacement.
  • the flame stabilizer fixing portion 3400 may have a rectangular shape, and the wear-resistant member 3500 may have a triangular shape while the inclined surface 3520 is a flat surface.
  • the inclined surface 3520 preferably forms an angle of 30 to 50° with the inner surface of the inner tubular body 100.
  • the wear-resistant member 3500 may be coupled to the flame stabilizer fixing portion 3400 by welding or bolting.
  • the wear-resistant member 3500 may be coupled to the flame stabilizer fixing portion 3400 in such a manner that the protrusion of the wear-resistant member 3500 is fitted into the groove of the flame stabilizer fixing portion 3400.
  • a nozzle tip of a pulverized coal burner according to a second embodiment of the present invention will be described with reference to Figs. 6 and 7 .
  • the nozzle tip according to the second embodiment differs from the nozzle tip according to the first embodiment in terms of the structure of an inclined surface, and the remaining structures are identical to each other in both embodiment. Therefore, only a different structure will be described without the description of the same structure.
  • an inclined surface 1420 is a curved surface.
  • the front side of the stabilizer 400 forms an angle of 90° with the inner surface of the inner tubular body 100
  • the inclined surface 1420 may be formed such that the width of the flame stabilizer is narrowed toward the central portion of the inner tubular body 100 from the inner surface thereof in the cross-section of the nozzle tip. That is, the inclined surface 1420 may have a quadrant shape that is concave toward the central portion of the inner tubular body 100.
  • each of flame stabilizers includes a flame stabilizer fixing portion 4400 which is fixed into an inner tubular body and a wear-resistant member 4500 which is detachably coupled to the side of the flame stabilizer fixing portion 4400, facing the direction in which pulverized coal flows in a first passage 120, similar to the third embodiment.
  • the wear-resistant member 4500 may have an inclined surface 4520 formed such that the first passage 120 is narrowed in the direction in which pulverized coal flows in the first passage 120.
  • the flame stabilizer may have a structure in which the wear-resistant member 4500, having the inclined surface 4520 formed such that the first passage 120 is narrowed in the direction in which pulverized coal flows in the first passage 120, is detachably coupled to the flame stabilizer fixing portion 4400 having a conventional elongated rectangular plate shape as illustrated in Fig. 3 .
  • the wear-resistant member 4500 is detachably coupled to the side of the flame stabilizer fixing portion 4400, facing the direction in which pulverized coal flows in the first passage 120.
  • the flame stabilizer fixing portion 4400 may have a rectangular shape, and the wear-resistant member 4500 may have the inclined surface 4520 which is curved at the side of the flame stabilizer fixing portion 4400 facing the flow direction of pulverized coal.
  • the curved surface has a quadrant shape that is concave toward the central portion of the inner tubular body 100.
  • the wear-resistant member 4500 may be coupled to the flame stabilizer fixing portion 4400 by welding or bolting.
  • the wear-resistant member 4500 may be coupled to the flame stabilizer fixing portion 4400 in such a manner that the protrusion of the wear-resistant member 4500 is fitted into the groove of the flame stabilizer fixing portion 4400.
  • the nozzle tip according to the fourth embodiment may obtain the same effect as the nozzle tip according to the third embodiment.
  • an inclined surface is formed on the side of each of flame stabilizers or the wear-resistant member thereof, facing the direction in which pulverized coal flows in a first passage in the nozzle tip. Accordingly, the pulverized coal collides obliquely instead of vertically with the flame stabilizer or wear-resistant member, thereby enabling the momentum of pulverized coal particles to be dispersed and enabling the wear resistance of the flame stabilizer or the wear-resistant member to be enhanced.
  • the flame stabilizer has a wide area compared to a conventional flame stabilizer having a rectangular plate shape and is fixed to the inner surface of an inner tubular body, it is possible to prevent the separation of the flame stabilizer due to abrasion.
  • the wear-resistant member since the wear-resistant member is detachably coupled to the flame stabilizer, the wear-resistant member can be attached to an existing flame stabilizer. Furthermore, only the wear-resistant member can be replaced to thereby reduce replacement costs, and the function of the flame stabilizer can be consistently maintained during the replacement.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP16204468.9A 2016-05-24 2016-12-15 Bec de tuyère de brûleur de charbon pulvérisé Active EP3249294B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160063430A KR101773297B1 (ko) 2016-05-24 2016-05-24 미분탄 버너의 노즐 팁

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EP3249294A1 true EP3249294A1 (fr) 2017-11-29
EP3249294B1 EP3249294B1 (fr) 2019-08-14

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KR (1) KR101773297B1 (fr)
CN (1) CN107420889A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230038688A1 (en) * 2021-08-03 2023-02-09 General Electric Technology Gmbh Pulverized solid fuel nozzle tip assembly with carbon tip portion

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Publication number Priority date Publication date Assignee Title
JP6926009B2 (ja) * 2018-02-01 2021-08-25 三菱パワー株式会社 燃焼バーナ及びボイラ
KR102080564B1 (ko) * 2018-10-02 2020-02-24 두산중공업 주식회사 미분탄 버너의 노즐 팁
JP7086831B2 (ja) * 2018-12-26 2022-06-20 三菱重工業株式会社 燃焼バーナ、ボイラ及び燃焼バーナの組立方法

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WO2010081271A1 (fr) * 2008-12-30 2010-07-22 上海锅炉厂有限公司 Buse pour charbon pulvérisé à allumage rapide
KR20120001185A (ko) * 2010-06-29 2012-01-04 두산중공업 주식회사 석탄 버너의 노즐 팁

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230038688A1 (en) * 2021-08-03 2023-02-09 General Electric Technology Gmbh Pulverized solid fuel nozzle tip assembly with carbon tip portion

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CN107420889A (zh) 2017-12-01
KR101773297B1 (ko) 2017-08-30
EP3249294B1 (fr) 2019-08-14

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