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EP0155120A2 - Procédé d'opération d'un brûleur à charbon - Google Patents

Procédé d'opération d'un brûleur à charbon Download PDF

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Publication number
EP0155120A2
EP0155120A2 EP85301347A EP85301347A EP0155120A2 EP 0155120 A2 EP0155120 A2 EP 0155120A2 EP 85301347 A EP85301347 A EP 85301347A EP 85301347 A EP85301347 A EP 85301347A EP 0155120 A2 EP0155120 A2 EP 0155120A2
Authority
EP
European Patent Office
Prior art keywords
coal
burner
gaseous medium
ultrafine
fed
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.)
Withdrawn
Application number
EP85301347A
Other languages
German (de)
English (en)
Other versions
EP0155120A3 (fr
Inventor
James Cooper
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.)
James Howden and Co Ltd
Original Assignee
James Howden and 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 James Howden and Co Ltd filed Critical James Howden and Co Ltd
Publication of EP0155120A2 publication Critical patent/EP0155120A2/fr
Publication of EP0155120A3 publication Critical patent/EP0155120A3/fr
Withdrawn legal-status Critical Current

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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 
    • F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
    • F23C1/10—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air liquid and pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • 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
    • 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

Definitions

  • the present invention relates to a method of operating a coal burner.
  • United States Patent 4 147 116 shows a similar light up arrangement for a burner using ultrafine coal of a particle size less than 40 microns, the arrangement there being to centrifuge the coal particles to the periphery of the burner tube, so that it is adjacent the incoming combustion air. Unless the oil or gas burner is provided at the centre, such a system would be totally unstable at low load or during light up.
  • GB-A-2093979 discloses a burner system for burning coal dust, which is usually recognized as referring to a pulverised fuel of which 70% is less than 70 microns.
  • An innermost tube is used as a supply for an igniting gas and this is surrounded by a tube for air for this gas, this in turn being surrounded by a tube for ignition coal dust. Outside this is a tube for the air for this dust and then surrounding this and inside the tube for power fuel dust, is a tube for additional ignition coal dust. All of the coal dust, i.e. the power coal dust, the ignition coal dust and the additional ignition coal dust flow vertically downwardly under gravity, but can be blown in. Such a system is extremely complex and is unlikely to operate in a stable manner.
  • Such a method allows the ultrafine coal to be used in a fully safe way as an ignition fuel and as a low load support fuel with a stable flame. This produces a very significant saving in cost as compared with the use of oil or gas.
  • the method can readily be applied by making a relatively minor modification to an existing burner, by replacing its ignition/low load burner with a single modified assembly.
  • the gaseous medium may be air, it is preferably an inert medium such as steam or flue gas.
  • the stream of ultrafine pulverized coal is raised to a temperature, which is preferably of the order of 130 to 190°C, so that its reactivity is greatly increased and behaves much more like a fuel such as oil than coal and it greatly reduces the requirement for fuel oil during the light up procedure.
  • the coal is also capable of acting as a support or auxiliary fuel under low load conditions.
  • the size of the particles of the ultrafine pulverized coal is such that at least 50% by weight of the coal is of a particle size of less than 12 microns in diameter.
  • the coal is pulverized in a pulverizer vessel by interparticle collision in at least one stream of gaseous medium preferably inert, to produce said ultrafine pulverized coal and a flow of the mixture of the ultrafine pulverized coal and the inert gaseous medium are fed directly from the pulverizer vessel to the burner, problems of storage and the inherent dangers associated therewith can be avoided
  • the stream of gaseous medium and ultrafine coal is passed through a separator, whereby some of the gaseous medium is removed from the stream, and the remaining stream which thus has a greater concentration of coal, is fed to the burner to act as the igniter or low load back up fuel.
  • the apparatus illustrated comprises a feed coal bunker 10 from which coal with a top size of between 6 mm and 36 mm is fed via a feeder 11 to a pulverizer vessel 12.
  • Air or preferably an inert gaseous medium, such as a flue gas or steam, is fed at an elevated temperature to a plurality of nozzles (not shown) which are mounted in an annular array with the nozzles each arranged to point upwardly and at an angle between a radius and a tangent to the annulus.
  • the pulverizer vessel 12 is shown with three outlet ducts 13, 14, 15, only one of which, duct 15, is shown being used according to the present invention.
  • This duct passes via a discharge valve 16 to a burner indicated by the general reference number 17.
  • the burner comprises a combustion chamber indicated generally at 18 and having an opening 19 for the inflow of combustion air from left to right as seen in the Figure.
  • a main nozzle 21 is mounted coaxially to the opening 19 and is fed via a feed duct 22 with particulate pulverized coal of a significantly higher diameter than the ultrafine pulverized coal flowing together with gaseous medium mixture from the pulverizer 12.
  • an igniter nozzle 23 having mounted coaxially therewithin an auxiliary oil inlet pipe 24 provided with an atomizer 25 at its discharge end.
  • a swirler 26 Within the nozzle 23 and surrounding the atomizer 25 is a swirler 26.
  • the igniter nozzle 23 is fed with light up air along its axis and with ultrafine coal via a tangential connection 27 from a feedline 28 which is connected to the heavy fraction outlet 29 of a centrifugal separator 30.
  • This separator is fed via an inlet 31 which is connected to a pipe 32 which in turn is connected to the outlet 15 of the pulverizer 12.
  • a diverter valve 33 is positioned within the pipe 32 and can be moved from the position illustrated in which fluid flowing in is directed along inlet 31 to the separator 30 to a second position in which the fluid flowing in is directed along the extension 34 of the pipe to a tangential inlet 35 to the main nozzle 21.
  • the light fraction outlet 36 of the centrifugal separator is provided with a throttle valve 37 by means of which the light fraction can be returned to the pipe extension 34 for feeding into the main nozzle 21.
  • coal is fed from the feed bunker 10 to the pulverizer 12 in which it is pulverized to an ultrafine state, that is with typically 50% by weight of the particles having a diameter of less than 12 microns.
  • the relevant portion of the mixture of gaseous medium, that is superheated steam, or flue gas or some other inert gas, and the ultrafine coal is then passed via line 15 to the burner.
  • the mixture flows into the separator 30 and a portion of the gaseous medium discharges via outlet 36 to the pipe 34 and thence is caused to flow tangentially with a swirl in the main nozzle 21.
  • the heavier fraction that is a more concentrated mixture of ultrafine pulverized coal and gaseous medium flows along the feedline 28 and is again caused to swirl in the igniter nozzle 23 with the same direction of swirl.
  • the mixture is at an elevated temperature, preferably of the order of 130 to 150°C and in this condition is readily capable of igniting.
  • the main nozzle 21 can have the coal in a pulverized condition fed along it through feed pipe 22 and can be burned in a conventional way. Thereafter the supply of ultrafine pulverized coal can be cut off by closing the valve 16.
  • a low load condition it is possible to reintroduce the ultrafine coal and in this condition it is possible to have the valve 33 in the non-illustrated position so that the coal and gaseous medium mixture is fed directly to the main burner without any concentration.
  • the tangential inlet 27 to the igniter nozzle 23 produces a measure of swirl and this can be increased by the swirler 26 adjacent the outlet to the igniter nozzle.
  • the presence of this swirl produces a central recirculating zone of hot gases and hot ultrafine coal which further enhances the flame stability.
  • the igniter nozzle is located coaxially within the main nozzle. It is also contemplated that it could be other than coaxial and it could be coaxially outside the main nozzle.
  • the pulverized coal in the ultrafine condition could be fed other than at an elevated temperature although this is not preferred.

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)
EP85301347A 1984-03-13 1985-02-27 Procédé d'opération d'un brûleur à charbon Withdrawn EP0155120A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP84301707 1984-03-13
EP84301707 1984-03-13

Publications (2)

Publication Number Publication Date
EP0155120A2 true EP0155120A2 (fr) 1985-09-18
EP0155120A3 EP0155120A3 (fr) 1987-02-25

Family

ID=8192589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85301347A Withdrawn EP0155120A3 (fr) 1984-03-13 1985-02-27 Procédé d'opération d'un brûleur à charbon

Country Status (7)

Country Link
EP (1) EP0155120A3 (fr)
JP (1) JPS60259817A (fr)
KR (1) KR850007861A (fr)
AU (1) AU3974985A (fr)
DK (1) DK111985A (fr)
FI (1) FI850977L (fr)
ZA (1) ZA851838B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2187835A (en) * 1986-03-14 1987-09-16 Laurie Edward Helyer Pulverised fuel burner
EP0236339A1 (fr) * 1985-08-22 1987-09-16 Weyerhaeuser Co Recuperation de l'energie provenant d'une biomasse utilisant du combustible reparti selon une granulometrie bimodale.
US4809624A (en) * 1987-03-16 1989-03-07 Shell Oil Company Method for starting up a partial combustion process
WO1990003837A1 (fr) * 1988-10-14 1990-04-19 Oy Finnpulva Ab Procede pour lier les composants de soufre formes dans une chaudiere a charbon pulverise
CN110186036A (zh) * 2019-06-17 2019-08-30 华北电力大学 一种超细煤粉异相还原低氮旋流燃烧器及改造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6627310B2 (ja) * 2015-07-31 2020-01-08 中国電力株式会社 石炭火力発電設備

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494070A (en) * 1945-09-10 1950-01-10 Blaw Knox Co Apparatus for burning pulverized fuel
US4147116A (en) * 1977-09-19 1979-04-03 Coal Tech Inc. Pulverized coal burner for furnace and operating method
EP0017367A1 (fr) * 1979-03-16 1980-10-15 MICROFUELS, Inc. Appareil et méthode de broyage de matériaux pulvérulents par énergie fluidique
US4241673A (en) * 1979-11-05 1980-12-30 Combustion Engineering, Inc. Direct ignition of pulverized coal
GB2093979A (en) * 1981-02-27 1982-09-08 Steag Ag A method for at least the two-stage ignition of a fuel dust power burner and a burner system for carrying out this method
US4419941A (en) * 1982-09-02 1983-12-13 Combustion Engineering, Inc. Supplying pulverized coal to a coal-fired furnace
EP0102421A1 (fr) * 1982-08-27 1984-03-14 JAMES HOWDEN & COMPANY LIMITED Appareil de pulvérisation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3105626C2 (de) * 1981-02-16 1986-07-31 L. & C. Steinmüller GmbH, 5270 Gummersbach Verfahren zum Bereitstellen des Zündbrennstaubes für eine Zündflamme zum Zünden einer Kohlenstaubrundbrennerflamme

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494070A (en) * 1945-09-10 1950-01-10 Blaw Knox Co Apparatus for burning pulverized fuel
US4147116A (en) * 1977-09-19 1979-04-03 Coal Tech Inc. Pulverized coal burner for furnace and operating method
EP0017367A1 (fr) * 1979-03-16 1980-10-15 MICROFUELS, Inc. Appareil et méthode de broyage de matériaux pulvérulents par énergie fluidique
US4241673A (en) * 1979-11-05 1980-12-30 Combustion Engineering, Inc. Direct ignition of pulverized coal
GB2093979A (en) * 1981-02-27 1982-09-08 Steag Ag A method for at least the two-stage ignition of a fuel dust power burner and a burner system for carrying out this method
EP0102421A1 (fr) * 1982-08-27 1984-03-14 JAMES HOWDEN & COMPANY LIMITED Appareil de pulvérisation
US4419941A (en) * 1982-09-02 1983-12-13 Combustion Engineering, Inc. Supplying pulverized coal to a coal-fired furnace

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BRENNSTOFF. W[RME. KRAFT, vol. 34, no. 3, March 1982, pages 131-135, W}rzburg, DE; K.D. RENNERT: "Kohlenstaubgefeuerter Z}ndbrenner" *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0236339A1 (fr) * 1985-08-22 1987-09-16 Weyerhaeuser Co Recuperation de l'energie provenant d'une biomasse utilisant du combustible reparti selon une granulometrie bimodale.
EP0236339A4 (fr) * 1985-08-22 1989-01-24 Weyerhaeuser Co Recuperation de l'energie provenant d'une biomasse utilisant du combustible reparti selon une granulometrie bimodale.
GB2187835A (en) * 1986-03-14 1987-09-16 Laurie Edward Helyer Pulverised fuel burner
GB2187835B (en) * 1986-03-14 1989-12-20 Laurie Edward Helyer Pulverised fuel burner
US4809624A (en) * 1987-03-16 1989-03-07 Shell Oil Company Method for starting up a partial combustion process
WO1990003837A1 (fr) * 1988-10-14 1990-04-19 Oy Finnpulva Ab Procede pour lier les composants de soufre formes dans une chaudiere a charbon pulverise
CN110186036A (zh) * 2019-06-17 2019-08-30 华北电力大学 一种超细煤粉异相还原低氮旋流燃烧器及改造方法

Also Published As

Publication number Publication date
DK111985D0 (da) 1985-03-12
DK111985A (da) 1985-09-14
FI850977A0 (fi) 1985-03-12
JPS60259817A (ja) 1985-12-21
EP0155120A3 (fr) 1987-02-25
FI850977L (fi) 1985-09-14
ZA851838B (en) 1985-11-27
AU3974985A (en) 1985-09-19
KR850007861A (ko) 1985-12-09

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Inventor name: COOPER, JAMES