US3373981A - Apparatus for operating a burner fired shaft furnace - Google Patents

Apparatus for operating a burner fired shaft furnace Download PDF

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Publication number
US3373981A
US3373981A US459071A US45907165A US3373981A US 3373981 A US3373981 A US 3373981A US 459071 A US459071 A US 459071A US 45907165 A US45907165 A US 45907165A US 3373981 A US3373981 A US 3373981A
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United States
Prior art keywords
furnace
burners
burner
operating
shaft furnace
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Expired - Lifetime
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US459071A
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English (en)
Inventor
Taubmann Harro
Boderke Hubert
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Didier Werke AG
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Didier Werke AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/08—Shaft or like vertical or substantially vertical furnaces heated otherwise than by solid fuel mixed with charge

Definitions

  • the present invention employs stage burners provided with two combustion chambers and interposed guide or conduit means with the first combustion chamber located at the inlet end of the second combustion chamber and at substantially right angles thereto.
  • stage burners provided with two combustion chambers and interposed guide or conduit means with the first combustion chamber located at the inlet end of the second combustion chamber and at substantially right angles thereto.
  • Honeycomb-like nozzle blocks may be arranged in the outlet openings discharging into the furnace shaft in order to improve the penetration effect of the outfiowing gases through the loose material being treated and such blocks may, of course, also be built into burners which do not operate according to the twostage principle.
  • the present invention relates essentially to the distribution and apportionment of the fuel to the burners of a shaft furnace, to the dosing of the cooling air and to the detailed construction of the burners, especially when the burners are disposed in two superposed planes.
  • An object of the invention is, depending upon the heat treatment method to be carried out and the type of material to be heat treated, that the quantity of fuel required for the heat treatment of the material be subdivided differentially or uniformly to the individual burners, that the combustion in the burners of the individual burner planes or levels take place differentially or uniformly stoichiometrically, sub-stoichiometrically or superstoichiometrically, and that the quantity of cool air be measured or dosed.
  • the heat distribution in the furnace can always be adapted to the particular heat treatment to be carried out and which is therefore of enhanced effect.
  • the present invention employs stage burners provided with two combustion chambers and interposed guide or conduit means with the first combustion chamber located at the inlet end of the second combustion chamber and at substantial- :ly right angles thereto.
  • stage burners provided with two combustion chambers and interposed guide or conduit means with the first combustion chamber located at the inlet end of the second combustion chamber and at substantial- :ly right angles thereto.
  • Honeycomb-like nozzle blocks may be arranged in the outlet openings discharging into the furnace shaft in order to improve the penetration effect of the outflowing gases through the loose material being treated and such blocks may, of course, also be built into burners which do not operate according to the two-stage principle.
  • a further object of the present invention is to improve the operation of a shaft furnace for the heat treatment of loose material as described in our application Ser. No. 303,622 filed Aug. 21, 1963, entitled, A Burner Fired Shaft Furnace and Process for Operating the Same, now abandoned.
  • the furnace is provided with burners located in the outer wall and which is operated by the blowing in of air under pressure, it being possible to withdraw gas from the top of the furnace and to reintroduce the same into the lower part of the furnace.
  • the furnace is provided with pressure burners which are distributed about the periphery of the furnace in one plane and which selectively produce completely burned or still burnable gas, with combustion chambers which open into the furnace interior, and are provided with outlet nozzles directed horizontally or substantially horizontally toward the furnace center, and are also provided with connections for furnace waste gases and fresh air.
  • pressure burners which are distributed about the periphery of the furnace in one plane and which selectively produce completely burned or still burnable gas
  • combustion chambers which open into the furnace interior, and are provided with outlet nozzles directed horizontally or substantially horizontally toward the furnace center, and are also provided with connections for furnace waste gases and fresh air.
  • FIG. 1 is a partial longitudinal section taken through a shaft furnace equipped according to the present invention.
  • FIG. 2 is a sectional view taken along section line 2-2 of FIGURE 1, on an enlarged scale.
  • FIG. 3 is a sectional view taken along section line 33 of FIGURE 2, on an enlarged scale.
  • FIGS. 4 and 5 are sectional views taken along section lines 4-4 and 5-5 of FIGURE 3 respectively.
  • FIG. 6 is an elevational view of a honeycomb nozzle block
  • I FIG. 7 is a diagrammatic View showing the direction of burning in the present invention.
  • the furnace wall 1 of the shaft furnace encloses the shaft 2 and in the wall 1 there are arranged a plurality of burners 55 in two planes 56 and 57 extending transversely of the furnace with the shaft cross-section of each burner plane 56 and 57 being widened.
  • the burners consist of a combustion chamber 58 discharging at one end into the furnace and at the other end there is a small pre-combustion chamber 59.
  • the two combustion chambers 58 and 59 are disposed at right angles to one another.
  • a guide means 60 is provided between the combustion chambers.
  • the smaller primary combustion chamber 59 has an air connection 61 and a fuel connection 62, while the larger secondary combustion chamber 58 is provided only with a fuel connection 63.
  • the guide means 60 as shown particularly in FIGURES 3, 4 and 5 constitutes a first tubular portion at the outlet end of the combustion chamber 59 as shown in FIGURE 4 and which then gradually is converted into the rectangular cross-section as shown in FIGURE 5. From there it extends so as to encircle spirally the combustionchamber 58 at the inlet end thereof.
  • honeycomb-like nozzle blocks are shown at 74 which can be inserted at the outlet end 76 of the burners.
  • Such a block as shown in FIG. 6 is provided with the apertures 75.
  • a small portion of the fuel is burned in the smaller combustion chamber 59 with an excess of air, after which the resultant combustion gases pass through the guiding means 60 into the larger secondary combustion chamber 58, into which the major part of the fuel is sprayed which is gasified by the hot combustion gases from the first combustion chamber 59.
  • the thus-produced hot oil gases enter into the furnace at a velocity which makes possible penetration of the bulk material as far as the furnace shaft axis or center 70.
  • the oil gases from the lower burner plane 57 with burners 71 come into contact with cooling air ascending through the shaft 2 from the lower end thereof and are preheated by the material being treated, and burn at a temperature of 1000 to 1100 C.
  • the resultant combustion gases which have an oxygen content of about 12 to 15%, flow to the upper burner level 56 with the burners 58, while treating the bulk material en route, and at such upper level mix with the oil gases coming from the burners at this level and which, because of oxygen deficiency, burn gently and slowly so that superheating of the material is excluded.
  • Heating device for a burner heated blast furnace serving for the heat treatment of bulk material, driven under pressure by forcing undergrate blast into the same and by heating gases manufactured by pressure burners, whereby fresh air may be added to the controllable constructed burners for the selective production of burned out or still burnable gases, being a mixture of furnace gases and intake air or undergrate blast air prewarmed in the furnace and withdrawn below the burner, comprising a vertical shaft furnace, burners with two series-connected combustion chambers located at the side of said furnace, fuel supply connections for said burner combustion chambers independent from another, guide means connecting said combustion chambers arranged between them guiding the stream of gas manufactured in the first chamber into the second chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US459071A 1964-05-29 1965-05-26 Apparatus for operating a burner fired shaft furnace Expired - Lifetime US3373981A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW0036875 1964-05-29

Publications (1)

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US3373981A true US3373981A (en) 1968-03-19

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US (1) US3373981A (de)
AT (1) AT264354B (de)
DE (1) DE1433882A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418108A (en) * 1965-12-17 1968-12-24 Ind Science Corp Externally fired cupola furnace and method of operation thereof
US4232854A (en) * 1978-05-26 1980-11-11 Barbakadze Dzhondo F Method of introducing powdered reagents into molten metals and apparatus for effecting same
US5070797A (en) * 1986-12-24 1991-12-10 Georg Fischer Ag Process and device to feed additives into a shaft or cupola furnace
US5161967A (en) * 1986-12-24 1992-11-10 Georg Fischer Ag Process and device to feed additives into a shaft or cupola furnace
US5307748A (en) * 1993-03-12 1994-05-03 Institute Of Gas Technology Cyclonic thermal treatment and stabilization of industrial wastes

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US513945A (en) * 1894-01-30 William a
US1197985A (en) * 1914-08-14 1916-09-12 Charles F Williams Heater.
US1841463A (en) * 1930-03-20 1932-01-19 Surface Combustion Corp Safety pilot apparatus
US2282551A (en) * 1938-12-12 1942-05-12 Drying Systems Inc Burner safety control
US2670946A (en) * 1950-10-31 1954-03-02 Pickands Mather & Co Apparatus for magnetic roasting
FR1244302A (fr) * 1956-10-30 1960-10-28 Brûleur à gaz
US3204936A (en) * 1961-06-21 1965-09-07 Beckenbach Karl Shaft furnace
US3275062A (en) * 1964-05-22 1966-09-27 Submerged Comb Inc Heating, evaporating and concentrating apparatus and processes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US513945A (en) * 1894-01-30 William a
US1197985A (en) * 1914-08-14 1916-09-12 Charles F Williams Heater.
US1841463A (en) * 1930-03-20 1932-01-19 Surface Combustion Corp Safety pilot apparatus
US2282551A (en) * 1938-12-12 1942-05-12 Drying Systems Inc Burner safety control
US2670946A (en) * 1950-10-31 1954-03-02 Pickands Mather & Co Apparatus for magnetic roasting
FR1244302A (fr) * 1956-10-30 1960-10-28 Brûleur à gaz
US3204936A (en) * 1961-06-21 1965-09-07 Beckenbach Karl Shaft furnace
US3275062A (en) * 1964-05-22 1966-09-27 Submerged Comb Inc Heating, evaporating and concentrating apparatus and processes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418108A (en) * 1965-12-17 1968-12-24 Ind Science Corp Externally fired cupola furnace and method of operation thereof
US4232854A (en) * 1978-05-26 1980-11-11 Barbakadze Dzhondo F Method of introducing powdered reagents into molten metals and apparatus for effecting same
US5070797A (en) * 1986-12-24 1991-12-10 Georg Fischer Ag Process and device to feed additives into a shaft or cupola furnace
US5161967A (en) * 1986-12-24 1992-11-10 Georg Fischer Ag Process and device to feed additives into a shaft or cupola furnace
US5307748A (en) * 1993-03-12 1994-05-03 Institute Of Gas Technology Cyclonic thermal treatment and stabilization of industrial wastes

Also Published As

Publication number Publication date
AT264354B (de) 1968-08-26
DE1433882A1 (de) 1969-01-09

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