EP0874965A1 - Moyens de chambre de combustion d'une unite de generation et de surchauffe de vapeur et methode d'exploitation - Google Patents

Moyens de chambre de combustion d'une unite de generation et de surchauffe de vapeur et methode d'exploitation

Info

Publication number
EP0874965A1
EP0874965A1 EP97929422A EP97929422A EP0874965A1 EP 0874965 A1 EP0874965 A1 EP 0874965A1 EP 97929422 A EP97929422 A EP 97929422A EP 97929422 A EP97929422 A EP 97929422A EP 0874965 A1 EP0874965 A1 EP 0874965A1
Authority
EP
European Patent Office
Prior art keywords
ports
furnace chamber
combustion air
combustor means
combustor
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Withdrawn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
EP97929422A
Other languages
German (de)
English (en)
Inventor
Barry Michael Downer
Raghbir Panesar
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.)
Altrad Babcock Ltd
Original Assignee
Mitsui Babcock Energy 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 Mitsui Babcock Energy Ltd filed Critical Mitsui Babcock Energy Ltd
Publication of EP0874965A1 publication Critical patent/EP0874965A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
    • F22B21/348—Radiation boilers with a burner at the top
    • 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

Definitions

  • This invention relates to combustor means of a vapour generating and vapour superheating unit and, more particularly, to a vapour generating and vapour superheating unit having an upright, substantially rectangular cross-section, furnace chamber provided with at least one horizontal row of combustor means in one wall, or in two, opposed, walls.
  • combustor means of a vapour generating and vapour superheating unit having an upright, substantially rectangular cross-section, furnace chamber provided with at least one horizontal row of combustor means in one wall, or in two, opposed, walls in which the or each horizontal row of combustor means includes a row of ports arranged as a centrally disposed group of ports and laterally disposed groups of ports disposed intermediate the side walls of the furnace chamber and the centrally disposed group with the ports of the centrally disposed group being provided solely with nozzle means for the supply of combustion air flows to the furnace chamber and the ports of the laterally disposed groups each being provided both with fuel nozzle means for the supply of fuel to the furnace chamber and with nozzle means for the supply of combustion air flows to the furnace chamber.
  • the invention also includes a method of operating combustor means of a vapour generating and vapour superheating unit having an upright, substantially rectangular cross-section, furnace chamber provided with at least one horizontal row of combustor means in one wall, or in two, opposed, walls in which the or each horizontal row of combustor means includes a row of ports arranged as a centrally disposed group of ports and laterally disposed groups of ports disposed intermediate the side walls of the furnace chamber and the centrally disposed group and in which the whole of the fuel and associated primary combustion air flows to the furnace chamber is dischaged through the ports in the laterally disposed groups of ports and secondary combustion air flows to the furnace chamber are discharged through the ports in the centrally disposed group of ports and through the ports in the laterally disposed groups of ports.
  • the invention will now be described, by way of example, with reference to the accompanying, partly diagrammatic drawing, of an arched furnace chamber portion 2 of a steam generating and superheating unit (not shown) having a form similar to that described in Japanese patent application published as JP-A2-1-200106.
  • the chamber portion 2 is formed with water tube wall panels providing planar side walls 4 and stepped front and rear walls 6, 8 each including hopper bottom portions 10, upright main portions 12, arch portions 14 and upper portions 16.
  • Ports 18, 18A and 20 are provided in the arch portions 14 and at the base of the upright main portions 12 by displacing the water tubes out of the plane of the associated panel.
  • Pulverised fuel burners 22, directed to discharge downwardly toward a hopper bottom 24 are disposed, as groups, in ports 18 adjacent the side walls 4, with, in each port, the burners 22 flanked by secondary combustion air discharge nozzles 26. Secondary combustion air is ducted also to the centrally disposed ports 18A for discharge through nozzles 26A. Means (not shown) are provided to proportion, if required, the secondary combustion air flows discharged in a downward direction from nozzles 26A in the ports 18A in the arch portions 14 in relation to combustion air discharges through the ports 18 and 20 such as to bias the thermal input to the furnace chamber 2 toward the side walls 4.
  • Tertiary combustion air flows discharged from nozzles 28, which may be adjustable in discharge direction, in the ports 20 in the base of the upright main wall portions 12 are proportioned to inject a sufficiency of air as to complete the combustion process of the pulverised fuel discharged into the furnace chamber 2 from the burners 22.
  • the ports 18, 18A and 20 may be arranged in pluralities of groups and/or rows to facilitate control of combustion gas flow patterns or other parameters within the furnace chamber and that a small proportion of fuel may be discharged through the centrally disposed ports.
  • the burners 22 are arranged to discharge pulverised fuel entrained in a sub-stoichiometric carrier air flow which, following ignition, burns in elongated paths directed downwardly toward the hopper bottom 24 and are biased toward the side walls 4 by secondary combustion air flows discharged from the centrally disposed nozzles 26A in the arch portions 14.
  • eighteen, equi-distantly spaced, ports are positioned in each arch portion 14 with a centrally disposed group of six ports 18A discharging secondary combustion air flows through nozzles 26A and two groups of six ports 18 laterally disposed to either side of the centrally disposed group discharging pulverised fuel, such as anthracite, entrained in primary combustion air flows through nozzles 22 together with secondary combustion air flows through the nozzles 26, all of the flows being directed downwardly toward the hopper bottom 24.
  • Eighteen, equi-distantly spaced, ports 20 are positioned at the bases of the front and rear walls 12 for the discharge of tertiary combustion air flows though the nozzles 28 in each port 20.
  • the flows of pulverised fuel entrained in primary combustion air are substantially equally divided between the twenty four nozzles 22 and the flows of secondary combustion air are substantially equally divided between all thirty six ports 18, 18A.
  • the primary combustion air flows are approximately 13% of the total air flow
  • the secondary combustion air flows are in the range of approximately 48% to 54% of the total air flow
  • the tertiary combustion air flows are in the range of approximately 39% to 33% of the total air flow.
  • the total air flow is such as to achieve an overall furnace chamber stoichiometry of 1.2.
  • Optimum reductions in NO ⁇ emission of around 40% compared with an arrangement in which discharges of pulverised fuel and primary combustion air flows are evenly distributed across the arch portions 14 is achieved with secondary combustion air flows of approximately 48% of the total air flow.
  • burners are positioned in ports in horizontal rows in vertically extending front and rear wall portions of a furnace chamber.
  • the burners are positioned in ports adjacent side walls of the furnace chamber whilst centrally disposed ports are utilised for the supply of additional combustion air. Further combustion air may be supplied through a further horizontal row or further horizontal rows of ports.
  • the burners are arranged to discharge pulverised fuel entrained in a sub-stoichiometric carrier air flow which, following ignition, burns in elongated paths biased toward the side walls by combustion air flows discharged through centrally disposed ports, thereby tending to avoid the creation of high temperature combustion gas flows centrally of the furnace chamber and thereby tending to avoid the formation of NO ⁇ .
  • the invention is applicable to other forms of burner, such as cylindrical burners, to other burner configurations, such as a front wall fired furnace chamber having tertiary combustion air supplied at an upper level of the furnace chamber, and to other fuels, as well as to an arrangement in which the side walls are protected by means of air flows interposed between the side walls and the flows of fuel and combustion air discharged from the laterally disposed groups of ports.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

Une chambre de four en voûte (2) d'une unité de génération et de surchauffe de vapeur est pourvue de conduits (18, 18A) dans ses parties voûtées (14) et de conduits de combustion d'air tertiaire (20) dans les parties de soubassement de ses parois (12). Des brûleurs à combustible pulvérisé (22), orientés pour une alimentation descendante vers le fond conique (24) sont ménagés, en groupes, dans des conduits (18) adjacents aux parois latérales (4), avec, dans chaque conduit, des brûleurs (22) flanqués de buses d'évacuation d'air de combustion secondaire (26). L'air de combustion secondaire est également dirigé vers des conduits disposés de manière centrale (18A) pour évacuation par des buses (26A). En exploitation, les brûleurs (22) diffusent le combustible pulvérisé entraîné dans un flux d'air porteur sous-stoechiométrique descendant vers le fond conique (24) et aspiré vers les parois latérales (4) par les flux d'air de combustion secondaire des buses centrales (26A). Le jet de flux enflammé de combustible pulvérisé vers les tubes à eau des parois latérale (4) par évacuation à travers les buses (26A) de l'air de combustion secondaire à une température inférieure à celle des gaz de combustion, tend à limiter la température atteinte dans le flux enflammé de combustible pulvérisé. De ce fait, la production d'oxyde d'azote (NOx) se trouve limitée. On peut envisager d'autres configurations pour la chambre du four.
EP97929422A 1996-07-05 1997-07-03 Moyens de chambre de combustion d'une unite de generation et de surchauffe de vapeur et methode d'exploitation Withdrawn EP0874965A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9614168.4A GB9614168D0 (en) 1996-07-05 1996-07-05 Combuster means of a vapour generating and vapour superheating unit
GB9614168 1996-07-05
PCT/GB1997/001786 WO1998001701A1 (fr) 1996-07-05 1997-07-03 Moyens de chambre de combustion d'une unite de generation et de surchauffe de vapeur et methode d'exploitation

Publications (1)

Publication Number Publication Date
EP0874965A1 true EP0874965A1 (fr) 1998-11-04

Family

ID=10796431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97929422A Withdrawn EP0874965A1 (fr) 1996-07-05 1997-07-03 Moyens de chambre de combustion d'une unite de generation et de surchauffe de vapeur et methode d'exploitation

Country Status (3)

Country Link
EP (1) EP0874965A1 (fr)
GB (1) GB9614168D0 (fr)
WO (1) WO1998001701A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295460C (zh) * 2004-07-22 2007-01-17 华中科技大学 W型火焰锅炉燃尽风装置及方法
GB201502891D0 (en) 2015-02-20 2015-04-08 Doosan Babcock Ltd Downshot burner
CN108386832B (zh) * 2018-01-12 2019-10-11 宁波大学 一种侧墙主导对称燃烧的低氮高效燃尽w火焰锅炉
CN109945163B (zh) * 2019-03-11 2019-10-22 哈尔滨工业大学 一种在后炉拱和冷灰斗后墙上方布置防偏风的w火焰锅炉

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5623615A (en) * 1979-08-06 1981-03-06 Babcock Hitachi Kk Burning method for low nox
JPS6026923B2 (ja) * 1980-06-10 1985-06-26 バブコツク日立株式会社 低ＮＯｘ燃焼装置
JPH0480517A (ja) * 1990-07-24 1992-03-13 Ishikawajima Harima Heavy Ind Co Ltd 火炉の腐食防止装置
US5205226A (en) * 1992-03-13 1993-04-27 The Babcock & Wilcox Company Low NOx burner system
US5505146A (en) * 1995-05-02 1996-04-09 The Babcock & Wilcox Company Burner pattern to minimize sidewall corrosion potential

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9801701A1 *

Also Published As

Publication number Publication date
WO1998001701A1 (fr) 1998-01-15
GB9614168D0 (en) 1996-09-04

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