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WO2014146867A1 - Régénérateur de haut-fourneau - Google Patents

Régénérateur de haut-fourneau Download PDF

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Publication number
WO2014146867A1
WO2014146867A1 PCT/EP2014/053559 EP2014053559W WO2014146867A1 WO 2014146867 A1 WO2014146867 A1 WO 2014146867A1 EP 2014053559 W EP2014053559 W EP 2014053559W WO 2014146867 A1 WO2014146867 A1 WO 2014146867A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
combustion chamber
dividing wall
chamber
stove
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.)
Ceased
Application number
PCT/EP2014/053559
Other languages
English (en)
Inventor
Alex Michael SMITH
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.)
Siemens PLC
Original Assignee
Siemens PLC
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 PLC filed Critical Siemens PLC
Publication of WO2014146867A1 publication Critical patent/WO2014146867A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C21B9/02—Brick hot-blast stoves
    • C21B9/06—Linings
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C21B9/10—Other details, e.g. blast mains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F27D99/0075—Gas curtain seals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C21B9/02—Brick hot-blast stoves
    • C21B9/04—Brick hot-blast stoves with combustion shaft

Definitions

  • This invention relates to a hot blast stove, in particular an internal combustion chamber hot blast stove.
  • Internal combustion chamber hot blast stoves comprise a chequer chamber and a combustion chamber, separated by a dividing wall. Fuel gas enters the combustion chamber and the products of combustion of the fuel gas pass out of the top of the combustion chamber and down the chequer chamber to heat up the chequer bricks.
  • internal combustion chamber hot blast stoves generate relatively high emissions when compared with an equivalent external combustion chamber design. This may be due to uncombusted gas passing through cracks in the bricks of the dividing wall, or through joints between the bricks, into the base of the chequer chamber.
  • an internal combustion chamber hot blast stove comprises a chequer chamber, a combustion chamber and a dividing wall; wherein the dividing wall further comprises a cavity; wherein the stove further comprises a cavity inlet and a cavity outlet and a supply of extraction gas connected to the cavity inlet; and wherein the cavity outlet is connected to a feedback line to an air inlet of the combustion chamber.
  • the extraction gas comprises one of nitrogen or air.
  • the cavity is formed between a combustion chamber wall and a chequer chamber wall of the dividing wall.
  • the cavity extends in height to at least the base of a burner in the combustion chamber.
  • the cavity extends along the full length of the dividing wall.
  • the stove further comprises one or more metal plates mounted to at least part of the dividing wall.
  • the plates extend along the same length of the dividing wall as the cavity.
  • the method further comprises feeding extracted gas back to an air inlet.
  • the method further comprises determining that fuel gas supply has ceased and terminating the flow of extraction gas before starting to heat cold blast in the chequer chamber.
  • a cavity wall in at least part of the dividing wall between the combustion chamber and chequer chamber with a flow of gas, typically of air or non pollutant gas, through it changes the pressure relationship and carries uncombusted gas out of the stove for reuse or other processing.
  • Figure 1 illustrates a conventional internal combustion chamber hot blast stove
  • Figure 2 illustrates an example of an internal combustion chamber hot blast stove according to the present invention
  • Figures 3a and 3b illustrates the dividing wall of Fig.2 in more detail; and, Figure 4 is a flow diagram of a method of operating the stove of Figs.2 and 3
  • a conventional internal combustion chamber hot blast stove 1 is illustrated in Fig.1.
  • the stove comprises a combustion chamber 2 and a chequer chamber 3 which are separated by a dividing wall 6.
  • a burner 10 at the base of the combustion chamber 2 is supplied with a fuel gas 4, which may be blast furnace gas or a mixture of blast furnace gas and a high calorific value enrichment gas.
  • the combustion products pass up to the top of the stove as indicated by arrow 5 and down through the chequer chamber 3 as indicated by arrow 8.
  • the chequer bricks are heated up by the passing combustion products, which then exit through outlet 9 at the bottom of the chequer chamber.
  • the dividing wall is typically made of refractory bricks and their natural porosity, as well as cracks formed or joints between the bricks, or where the dividing wall joins the side walls of the stove, mean that some uncombusted fuel gas 7 may pass through the dividing wall into the bottom of the chequer chamber 3 and exit through the outlet 9, increasing the carbon monoxide content of the waste gas exiting the chequer chamber.
  • an internal combustion chamber hot blast stove results in a lower capital cost than an equivalent external combustion chamber stove, the higher emissions levels may lead to customers preferring to opt for an external stove design.
  • the present invention addresses the problems of the prior art by constructing the dividing wall 21 with a cavity 23 formed by walls 24 and 25 and providing a gas supply that flows through the cavity from an inlet 22 on the stove shell to an outlet 26 on the stove shell and is collected and fed back to the fuel supply.
  • the narrow cavity 23 inside the dividing wall between the combustion and chequer chambers runs for the full length of the dividing wall and part way up the height of the wall.
  • the cavity 23 runs at least up to the height of the base of the burner.
  • a substantially constant supply of gas typically air or nitrogen, is passed through the cavity 23 from the inlet 22 to the outlet 26.
  • the cavity alone provides an improvement on conventional dividing walls, but better results are achieved by also having a supply of gas passing through this cavity to intercept any uncombusted gas which has managed to get through the first part 25 of the dividing wall into the cavity 23.
  • the invention results in a reduction in emissions compared to conventional internal combustion chamber stove designs, allowing users to benefit from the lower capital cost of internal combustion chamber stove, without a negative effect on emissions.
  • alloy plates installed as part of the dividing wall to reduce the passage of gas through the wall. This is illustrated in Fig.3b.
  • these plates may provide a good degree of prevention initially, they are unlikely to last the full life of the stove. After an initial period of operation with the plates in place, emissions would eventually rise back to the previous levels once the plates reach the end of their useful life.
  • the metal plates may improve emission control for at least a part of the lifetime of the stove.
  • the plates may extend along the full length of the partition wall, or only along that part of the partition wall provided with the cavity. In some cases, it may be desirable for the metal plate to extend a little beyond the end of the cavity, still on the partition wall.
  • Fig.4 is a flow diagram showing a method of operation of the internal combustion hot blast stove of the present invention.
  • fuel gas enters 32 the combustion chamber and is burnt by the burner to generate 33 combustion products which provide heat to the chequer chamber 3.
  • the extraction gas supply is activated 31 and starts to flow through the cavity 23 of the dividing wall 21. This ensures that any uncombusted gas which penetrates the wall 25 between the combustion chamber 2 and the cavity 23 is carried away 34 before it can enter the chequer chamber.
  • the gas cycle has finished 35, 36 and the fuel gas supply has ceased, then the extraction gas is no longer required and is terminated 38.
  • the stove is now ready to start the blast cycle 39 and heat up the cold blast by passing it through the heated chequer chamber 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

L'invention porte sur un régénérateur de haut-fourneau à chambre de combustion interne qui comprend un puits de ruchage (3), une chambre de combustion (2) et une paroi de séparation (6). De plus, ladite paroi de séparation comporte une cavité (23). Le régénérateur est également doté d'une entrée de cavité (22), d'une sortie de cavité (26) et d'une alimentation en gaz d'extraction reliée à ladite entrée de cavité (22). La sortie de cavité (26) est reliée à une conduite de retour menant à une entrée d'air de la chambre de combustion (2).
PCT/EP2014/053559 2013-03-22 2014-02-24 Régénérateur de haut-fourneau Ceased WO2014146867A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1305304.6A GB2512139B (en) 2013-03-22 2013-03-22 Hot blast stove
GB1305304.6 2013-03-22

Publications (1)

Publication Number Publication Date
WO2014146867A1 true WO2014146867A1 (fr) 2014-09-25

Family

ID=48226892

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/053559 Ceased WO2014146867A1 (fr) 2013-03-22 2014-02-24 Régénérateur de haut-fourneau

Country Status (2)

Country Link
GB (1) GB2512139B (fr)
WO (1) WO2014146867A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1398031A (fr) * 1964-03-24 1965-05-07 Produits Refractaires Perfectionnements aux appareils à chauffer le vent des hauts fourneaux
JPS5316307A (en) * 1976-07-30 1978-02-15 Nippon Steel Corp Operating method for hot stove
SU971886A1 (ru) * 1980-12-17 1982-11-07 Днепропетровский Ордена Трудового Красного Знамени Металлургический Институт Доменный воздухонагреватель
US4369954A (en) * 1979-07-21 1983-01-25 Didier-Werke Ag Regenerative air preheater with improved insulation between combustion chamber and checker shaft
SU1043168A1 (ru) * 1981-04-14 1983-09-23 Днепропетровский Металлургический Институт Воздухонагреватель доменной печи

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1398031A (fr) * 1964-03-24 1965-05-07 Produits Refractaires Perfectionnements aux appareils à chauffer le vent des hauts fourneaux
JPS5316307A (en) * 1976-07-30 1978-02-15 Nippon Steel Corp Operating method for hot stove
US4369954A (en) * 1979-07-21 1983-01-25 Didier-Werke Ag Regenerative air preheater with improved insulation between combustion chamber and checker shaft
SU971886A1 (ru) * 1980-12-17 1982-11-07 Днепропетровский Ордена Трудового Красного Знамени Металлургический Институт Доменный воздухонагреватель
SU1043168A1 (ru) * 1981-04-14 1983-09-23 Днепропетровский Металлургический Институт Воздухонагреватель доменной печи

Also Published As

Publication number Publication date
GB2512139A (en) 2014-09-24
GB201305304D0 (en) 2013-05-01
GB2512139B (en) 2015-07-15

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