US3856463A - Inclined furnace for calcination and sintering of material particularly splint limestone - Google Patents

Inclined furnace for calcination and sintering of material particularly splint limestone Download PDF

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Publication number
US3856463A
US3856463A US00401698A US40169873A US3856463A US 3856463 A US3856463 A US 3856463A US 00401698 A US00401698 A US 00401698A US 40169873 A US40169873 A US 40169873A US 3856463 A US3856463 A US 3856463A
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United States
Prior art keywords
recuperator
shaft
inlet shaft
area
silo
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Expired - Lifetime
Application number
US00401698A
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English (en)
Inventor
K Beckenbach
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.)
WARMESTELLE STEINE und ERDEN A GERMAN CORP GmbH
WARMESTELLE STEINE und ERDEN GmbH
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Individual
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Priority claimed from DE19722247785 external-priority patent/DE2247785C3/de
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Publication of US3856463A publication Critical patent/US3856463A/en
Assigned to WARMESTELLE STEINE UND ERDEN GMBH, A GERMAN CORP. reassignment WARMESTELLE STEINE UND ERDEN GMBH, A GERMAN CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BECKENBACH, KARL
Assigned to WARMESTELLE STEINE UND ERDEN GMBH reassignment WARMESTELLE STEINE UND ERDEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BECKENBACH, HELMUTH, BECKENBACH, KARL BY HELMUTH BECKENBACH, ATTORNEY IN FACT, BECKENBACH, ULRICH
Assigned to BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUNDERS PLAZA, EAST HARTFORD, CT. 06108 A CT. CORP. reassignment BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUNDERS PLAZA, EAST HARTFORD, CT. 06108 A CT. CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FULLER COMPANY
Assigned to FULLER COMPANY reassignment FULLER COMPANY RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BARCLAYS BUSINESS CREDIT, INC., A CORP OF CT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/02—Methods and apparatus for dehydrating gypsum
    • C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling

Definitions

  • Feed and discharge shafts are arranged in a staggered relatlonr.. e 5.5a O n e m auhm mmm s aaS i mS aeSn g .W r r a a mfl .m.mh hm m Wm e .m e .m 0 0 m t Wrh C In pt ma f S r. O Y a g hg s .m n
  • This invention relates to an inclined furnace for the calcination and sintering of material, particularly split limestone material, comprising one or more superposed burning areas preferably having an arch'like ceil ing, a laterally limited inclined discharge surface at burners located in the burner area wall opposite the discharge surface, and feed and discharge shafts arranged in a staggered relationship with respect to each other at the ends of the discharge surface are substantially rectangular shape for the material to be treated, and draft openings following the upper end of the discharge surface connecting the burner area with a recuperator.
  • the prior art includes an oblique furnace in which the ma terial is fed from a preheating shaft located above the burning area, or in case of several burning areas located above the upper burning area, to an oblique runoff surface on which the material slides while being subjected to impingement of the heating gases generated by the burners, then leaving the burning area by way of an outlet located at the lower end of the chute surface.
  • This discharge may be in the form of a cooling shaft or lead to another burner area located below the first burner area. Part of the heating gases impinging on the layer material is thereby aspirated through the material to the chute surface and then removed from the furnace near the upper end of this surface and fed to a recuperator which is utilized for preheating the fresh air supplied to the burners.
  • recuperator With the presence of the recuperator it is possible to supply fresh air to the burners, on the one hand, so that for this purpose no preheated combustion air needs to be removed from the cooling zone.
  • the combustion air contains a large amount of dust and would cause plugging the other burners and in the conduits resulting in inconvenient cleaning operations.
  • the use of the recuperator effects a better gasification of the material layer as it slides down the chute surface.
  • the primary object of the present invention is to provide an inclined furnace of the type described above wherein the part of the gases which penetrate the material layer and flow into the area located on top of the apertures of the preheating shaft is increased to provide an optimum heating of the material as it slides down the chute surface, and to avoid, as far as possible, any damage to the arched ceiling.
  • At least the elongate walls of the upper feed or preheating shaft above the discharge apertures are arranged to diverge upwardly relative to each other and that the preheating shaft changes at its flared upper end in its area facing the burner area ceiling into a presilo fed by the feeding apparatus and at its area facing the recuperator, by forming an abutment surface for the material exiting from the presilo and at a point located below the presilo it changes into a gas collecting area which communicates with the chimney.
  • this preheating shaft With the design of this preheating shaft, the material constantly discharged at the upper end of the shaft from the presilo, corresponding with the discharge of calcium, moves along an abutment line extending downwardly and obliquely from the silo side facing the recuperator toward the shaft wall on the recuperator side.
  • the coarser rocks roll down along this abutment and concentrate on the side of the shaft facing away from the burner area ceiling. This assures that the feed shaft is filled over its entire height on the side facing away from the burner area ceiling, preferably with coarser rocks, which means that it is packed more loosely than on the shaft side facing the ceiling.
  • the material layer sliding down along the chute surface has a looser packing adjacent to the chute surface so that the gases penetrating the material layer can flow immediately along the chute surface to the discharge ports.
  • the part of the exhuast gases not aspirated through the discharge ports preferably rises in the preheating shaft along its wall on the recuperator side, caused by a looser packing in this area, and enters the chimney through the gas collection area without reaching the presilo.
  • This structure offers the additional advantage that the presilo is not traversed by exhaust gases, so that it is not heated in its upper filling area. This is the reason that it was impossible in the feed arrangements of inclined furnaces heretofore known, and the reason that it is now possible, to arrange a conveyor belt made of elastic material, for example rubber, and movable in the longitudinal direction of the presilo, immediately above the silo, without fear of damage to the belt by hot exhaust gases.
  • the longitudinal central plane of the presilo is staggered with respect to the longitudinal plane of the preheating shaft in a direction toward the burner area ceiling and the elongate wall facing the burner area ceiling is inclined more than the elongate wall on the recuperator side.
  • FIG. 1 is a partial schematic, partial sectional, illustration of an inclined furnace designed according to the present invention
  • F IG. 2 is an illustration of the upper part of the furnace shown in FIG. 1 presented on an enlarged scale;
  • the oblique furnace illustrated in the drawing is provided with a burner area 10, preferably covered on top by an arch-shaped ceiling l2 and having at the side opposite the burners .14 an oblique chute surface 16, followed at its lower end by a transverse shaft which leads to a lower burner area 18.
  • Discharge openings 22 are provided at the upper end of the chute surface 16, which openings lead to a recuperator 24. Part of the heating gases originating from the burners penetrates the layer of materials sliding down the chute surface and is directed through the discharge openings 22 into recuperator 24 where fresh air supplied to the burners by way of a blower 25 is preheated.
  • the present invention relates to the particular design of the preheating shaft 26 (FIG. 2) leading to the upper burner area 12 and the feeding of material to the shaft 26, as well as the conducting of material within this shaft.
  • the substantially rectangular preheating shaft 26 is so designed that it flares upwardly by a considerable degree, whereby at least both of its elongate side walls 28 and 30 upwardly diverge relative to each other.
  • both of these side walls are inclined upwardly and outwardly, whereby the wall 28 originating from the furnace ceiling 12 is inclined more than its opposite wall 30, which extends in an upward direction from the discharge openings 22 leading to the recuperator 24.
  • the preceding shaft 26 changes at its flared upper end on the side located above the furnace ceiling 12 into a presilo by way of which the material to be burned is supplied.
  • the central longitudinal plane a-b of presilo 32 is staggered to the right in relation to the longitudinal center plane c-d which extends through the lower discharge area of the shaft 26 and bisects the furnace ceiling 12.
  • the shaft 26 is opened on the side of the recuperator side of its flared upper end and terminates into a gas collection area located at a point below the presilo.
  • the gas collection area 34 is connected by way of a conduit 36 (FIG. 2) with the chimney 38 and/or an exhaust fan 40 connected to the gas collection area (see FIG. 1), the latter also being connected to the exhaust gas portion of the recuperator. Because of this arrangement, the material discharging from the presilo 32 at the side of the shaft open toward the gas collection area 34 flows along a slope at 42 between the presilo and the wall 30. As seen in Fig.
  • FIG. 3 is a sectional view of the oblique furnace exhaust gases discharge to the exterior by way of a presilo 32; and it is also avoided that the edge 46 of the arched ceiling 12 facing away from the burners 14 will be excessively bombarded with exhaust gases and therefore endangered. Because the larger rocks are impinged more intensively in the preheating shaft by the heating gases than the smaller rocks passing particularly at the other shaft side and located as indicated by the reference character 48 and optimum uniform preheating of the material is achieved in the preheating shaft.
  • a uniform temperature of exhaust gases results against a feed without presilo in that the rocks gradually slide down from the presilo, while no certain quantity of cold material is directly fed, at intervals, into the preheating shaft.
  • While the material to be fed is so arranged in the presilo as it is fed by the conveyor system, for example a conveyor belt 50, and has in addition to larger rocks, also smaller fragments fed from the beginning along with the larger rocks, produced in the presilo by friction or percussion, during the downward sliding of the material from the presilo.
  • the larger rocks located toward the abutment 42 will slide downwardly. Therefore, near the short wall on the recuperator side, these larger rocks form a loosely packed layer, while the smaller granular parts preferably remain below the presilo, that is in proximity to the wall 28 on the ceiling side of the apparatus.
  • Another advantage of the design of a preheating shaft according to the present invention results from the fact that, due to feeding the shaft from a presilo not traversed by exhaust gases, it is possible to utilize, in lieu of a conveying system made from heat-resisting material, a conveyor belt 50 made of elastic material, for example rubber, which is movably arranged in a spacedsaving manner immediately adjacent an above presilo, with respect to the longitudinal direction of presilo.
  • a furnace for calcining and sintering material, particularly split-limestone material comprising a firing chamber defined by a slopping hearth having upper and lower ends, a dome-like roof, lateral walls and a wall opposite said hearth; at least one burner located in said chamber defined by a sloping hearth having upper and fice means adjacent said upper end of said hearth; a re cuperator connected to said firing chamber through said orifice means; vertical inlet and outlet shafts for material to be treated located at said ends of said hearth and laterally staggered relative to each other, each said shaft being defined by a pair of opposed long walls and a pair of opposed short walls, at least said long walls of said inlet shaft diverging upwardly above said orifice means, and said long and short walls of said inlet shaft defining an inlet shaft top opening having opposed lateral portions; a pre-silo arranged to discharge material into one of said lateral portions of said inlet shaft opening; a gas collection chamber arranged in the other of said lateral
  • a furnace according to claim 1 including a feed belt of elastic material located immediately above said pre-silo and movable in the longitudinal direction

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)
US00401698A 1972-09-29 1973-09-28 Inclined furnace for calcination and sintering of material particularly splint limestone Expired - Lifetime US3856463A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722247785 DE2247785C3 (de) 1972-09-29 Schrägofen zum Brennen und Sintern von Material, insbesondere von Kalksteinsplitt

Publications (1)

Publication Number Publication Date
US3856463A true US3856463A (en) 1974-12-24

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US00401698A Expired - Lifetime US3856463A (en) 1972-09-29 1973-09-28 Inclined furnace for calcination and sintering of material particularly splint limestone

Country Status (8)

Country Link
US (1) US3856463A (de)
JP (1) JPS5735388B2 (de)
AT (1) AT323631B (de)
BE (1) BE805349R (de)
FR (1) FR2201752A6 (de)
GB (1) GB1405208A (de)
IT (1) IT1045633B (de)
YU (1) YU37226B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050056686A1 (en) * 2003-09-15 2005-03-17 Accutech Co., Ltd And Korea Institute Of Industrial Technology Hydrogen gas brazing method for manufacturing a diamond tool and arch-shaped hydrogen gas brazing apparatus for performing the same
CN113173717A (zh) * 2021-05-20 2021-07-27 江西福得利碳酸钙业有限责任公司 一种氧化钙生产工艺及其制备装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6055755B2 (ja) * 1981-11-05 1985-12-06 宇部興産株式会社 二重傾斜炉
CN116395993B (zh) * 2023-06-02 2023-08-18 北京市弘洁蓝天科技股份有限公司 一种基于制备生石灰方法的装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533142A (en) * 1945-07-19 1950-12-05 Pickands Mather & Co Heat-treating solids
US2627399A (en) * 1947-11-18 1953-02-03 Erie Mining Co Cement manufacture
US3216125A (en) * 1961-05-27 1965-11-09 Dennert Heinz Method of and apparatus for heattreating granular materials in a gas current
US3765827A (en) * 1971-07-28 1973-10-16 K Beckenbach Inclined hearth kiln for the firing and sintering of material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533142A (en) * 1945-07-19 1950-12-05 Pickands Mather & Co Heat-treating solids
US2627399A (en) * 1947-11-18 1953-02-03 Erie Mining Co Cement manufacture
US3216125A (en) * 1961-05-27 1965-11-09 Dennert Heinz Method of and apparatus for heattreating granular materials in a gas current
US3765827A (en) * 1971-07-28 1973-10-16 K Beckenbach Inclined hearth kiln for the firing and sintering of material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050056686A1 (en) * 2003-09-15 2005-03-17 Accutech Co., Ltd And Korea Institute Of Industrial Technology Hydrogen gas brazing method for manufacturing a diamond tool and arch-shaped hydrogen gas brazing apparatus for performing the same
CN113173717A (zh) * 2021-05-20 2021-07-27 江西福得利碳酸钙业有限责任公司 一种氧化钙生产工艺及其制备装置

Also Published As

Publication number Publication date
DE2247785B2 (de) 1975-06-12
JPS49133297A (de) 1974-12-20
DE2247785A1 (de) 1974-04-11
BE805349R (fr) 1974-03-26
YU37226B (en) 1984-08-31
YU181673A (en) 1982-02-25
GB1405208A (en) 1975-09-03
AT323631B (de) 1975-07-25
IT1045633B (it) 1980-06-10
JPS5735388B2 (de) 1982-07-28
FR2201752A6 (de) 1974-04-26

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AS Assignment

Owner name: WARMESTELLE STEINE UND ERDEN GMBH; KLEVER STRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BECKENBACH, KARL;REEL/FRAME:003935/0190

Effective date: 19811109

AS Assignment

Owner name: WARMESTELLE STEINE UND ERDEN GMBH, KLEVER STRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BECKENBACH, KARL BY HELMUTH BECKENBACH, ATTORNEY IN FACT;BECKENBACH, ULRICH;BECKENBACH, HELMUTH;REEL/FRAME:003948/0509

Effective date: 19820111

Owner name: WARMESTELLE STEINE UND ERDEN GMBH, A GERMAN CORP.,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BECKENBACH, KARL BY HELMUTH BECKENBACH, ATTORNEY IN FACT;BECKENBACH, ULRICH;BECKENBACH, HELMUTH;REEL/FRAME:003948/0509

Effective date: 19820111

Owner name: WARMESTELLE STEINE UND ERDEN GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BECKENBACH, KARL BY HELMUTH BECKENBACH, ATTORNEY IN FACT;BECKENBACH, ULRICH;BECKENBACH, HELMUTH;REEL/FRAME:003948/0509

Effective date: 19820111

AS Assignment

Owner name: BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUND

Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY;REEL/FRAME:004994/0255

Effective date: 19881214

AS Assignment

Owner name: FULLER COMPANY, PENNSYLVANIA

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BARCLAYS BUSINESS CREDIT, INC., A CORP OF CT;REEL/FRAME:005465/0255

Effective date: 19900912