US3351685A - Process for firing and cooling particulate solids - Google Patents

Process for firing and cooling particulate solids Download PDF

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US3351685A
US3351685A US508080A US50808065A US3351685A US 3351685 A US3351685 A US 3351685A US 508080 A US508080 A US 508080A US 50808065 A US50808065 A US 50808065A US 3351685 A US3351685 A US 3351685A
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fraction
coarse
pile
piles
firing
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Schmid Alois
Hofer Hermann
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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
    • F27B1/02—Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey

Definitions

  • PROCESS FOR FIRING AND COOLING PARTICULATE SOLIDS Filed Nov. 16, 1965 United States Patent 3,351,685 PROCESS FOR FIRING AND COOLING PARTICULATE SOLIDS Alois Schmid, Gregor Mendelstrasse 46, Vienna XIX, Austria, and Hermann Hofer, Richard Wagner Strasse 28, Postfach 8027, Zurich, Switzerland Filed Nov. 16, 1965, Ser. No. 508,080 Claims priority, application Austria, Nov. 17, 1964, A 9,724/64 6 Claims. (Cl. 26352) ABSTRACT OF THE DISCLOSURE Particulate solids, such as ground limestone, are fired and cooled in a vertical kiln which comprises at least two wells.
  • This invention relates to an improvement in a process of firing and cooling particulate solids, such as ground limestone.
  • This process is carried out in a vertical kiln which comprises at least two wells.
  • the hot gases pass in periodic alternation through the firing zone of each well in co-current and countercurrent flows.
  • Those layers of the piles of material which are disposed above the firing zone are passed through in periodic alternation by the exhaust gases in one vertical direction and by another heat transfer fluid, such as air, in the other vertical direction.
  • This process may be used, e.g., for firing ground limestone having a certain particle size, which must not vary excessively.
  • this is accomplished essentially in that the material to be fired is divided into two fractions, the coarser one of these fractions, having a particle size range, e.g., of 60-150 mm, being charged together with the fuel to a known vertical kiln system consisting of two wells, which are periodically operated with co-current and countercurrent flows, and the fine fraction, having a particle size range of, e.g., 10-60 millimeters, being charged without addition of fuel to a third well, gases being withdrawn from the firing zone of each well of the vertical kiln system containing the coarse fraction and being fed to the other well of said system, secondary air being passed upwardly through the layers disposed below the firing zone, said gases and secondary air being passed in a cross-current flow through the pile formed by the fine fraction, said pile being disposed between the piles formed by
  • Part of the gases may be diverted from the cross-current flow and may be passed upwardly, if desired after throttling, through the pile of material in the third well so that the material of this pile is preheated to the reaction temperature.
  • the kiln provided according to the invention for carrying out the process comprises in known manner two wells, each of which contains a preheating zone, a firing zone and a cooling zone, said wells being interconnected and having openings for feeding the material to be fired, for withdrawing the fired material, and for feeding the fuel and primary and secondary air, and is characterized in that a further well is provided between the two wells and has openings which communicate with at least part of the firing zones of the two other wells.
  • the third well may be provided at the lower end of its cooling zone with inlet openings for secondary air, and may be provided in its upper portion with variable outlet openings for the exhaust gases which are passed upwardly in said well.
  • a double-well kiln comprises wells 1 and 2.
  • Each of these wells comprises a preheating zone V for the material to be fired, a firing zone B and a cooling zone K for the fired material'
  • the material to be fired having a particle size of 60-150 millimeters is charged to the two wells at 3, moves through these wells in the form of a pile and is withdrawn in alternation from the lower end of the pile.
  • the fuel gas is supplied with the aid of long pipes 4, the lower end of which defines the beginning of the firing zone.
  • the combustion air which is required is also supplied to the top of the wells (arrow 5), and is heated to the reaction temperature by the preheated material and then supports the combustion of the gas which emerges from the pipes 4.
  • the combustion gases and any unburnt gas, as well as secondary air, which is supplied from below in a counter-current flow (arrow 6), emerge laterally from the well 1 and pass in a cross-current flow through the pile of material contained in an intervening well 7 into the well 2, where they are passed upwardly while the remaining gases are burnt in a counter-current flow.
  • the combustion of these gases results in a fitting of the material in the firing zone and in a preheating of the newly supplied material.
  • the exhaust gases are cooled below C. at the newly fed material and are discharged from this well through a flue 8.
  • a regulating valve may be provided for regulating the rate at which gases are passed upwardly in counter-current flow in this well 7 so that the preheating of the newly fed fines may be controlled.
  • Secondary air may be continuously supplied to all three wells from below during the operation.
  • a process of firing and cooling particulate solids which comprises dividing said solids into a coarse fraction and a fine fraction, causing said coarse fraction to descend in the form of first and second coarse-fraction piles disposed one beside, and spaced from the other, causing said fine fraction to descend in the form of a third pile disposed between said coarse-fraction piles, burning fuel in said first and second piles to produce hot gas, passing said hot gas, in periodic alternation, upwardly in one of said coarse-fraction piles and downwardly in the other of said coarse-fraction piles, and then downwardly in said one coarse-fraction pile and upwardly in said other c0arse-fraction pile, whereby a preheating zone, a firing zone, and a cooling zone are formed, from top to bottom, in each of said coarse-fraction piles, passing secondary air upwardly in both said coarse-fraction piles below said firing zone thereof, withdrawing gas emerging from said firing zone of said coarse-fraction pile in which gas is passed downwardly, passing said withdrawn gas and secondary air from the same coarse-fraction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
US508080A 1964-11-17 1965-11-16 Process for firing and cooling particulate solids Expired - Lifetime US3351685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT972464A AT248941B (de) 1964-11-17 1964-11-17 Verfahren zum Brennen und Kühlen von körnigem Gut, z. B. von Kalkstein, und Ofen zur Durchführung des Verfahrens

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US3351685A true US3351685A (en) 1967-11-07

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ID=3616690

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US508080A Expired - Lifetime US3351685A (en) 1964-11-17 1965-11-16 Process for firing and cooling particulate solids

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US (1) US3351685A (de)
AT (1) AT248941B (de)
DE (1) DE1252850B (de)
FR (1) FR1454858A (de)
GB (1) GB1089988A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4948364A (en) * 1986-06-10 1990-08-14 Thompson Jeffery L Lime kilns
CN1035172C (zh) * 1991-04-27 1997-06-18 夫拉迪米尔·尼古拉维奇·多果波洛夫 建筑制品制造方法和设备

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771946A (en) * 1971-05-17 1973-11-13 H Hofer Method for carrying out endothermic processes in a shaft furnace
DE2629338A1 (de) * 1976-06-30 1978-01-05 Shell Ag Schachtofen
FR2422124A1 (fr) * 1978-04-05 1979-11-02 Solvay Procede et installation pour le traitement thermique d'une matiere
DE2826167C2 (de) * 1978-06-15 1985-04-04 Wärmestelle Steine und Erden GmbH, 4000 Düsseldorf Ringschachtofen zum Brennen von stückigem Brenngut
DE2900078A1 (de) * 1979-01-02 1980-07-17 Kloeckner Humboldt Deutz Ag Schachtvorwaermer
CH638296A5 (de) * 1979-02-28 1983-09-15 Maerz Ofenbau Verfahren und anlage zum brennen von karbonhaltigen rohstoffen mittels zerkleinerten festen brennstoffen in einem gleichstrom-regenerativ-schachtofen.
AT370707B (de) * 1981-06-16 1983-04-25 Maerz Ofenbau Verfahren und gleichstrom-regenerativ-schachtofen zum brennen von kalkstein und aehnlichen mineralischen rohstoffen
CH686459A5 (de) * 1992-03-07 1996-03-29 Maerz Ofenbau Schachtofen zum Brennen von stuckigem, mineralischem Fuellgut.
DE102008039545B3 (de) 2008-08-25 2010-05-12 Polysius Ag Verfahren zum Brennen von stückigem Material sowie Verwendung eines Schachtofens zur Durchführung des Verfahrens

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US71776A (en) * 1867-12-03 Improvement in furnaces for roasting and reducing ores
US166977A (en) * 1875-08-24 Improvement in furnaces for ssvieltimg ore
AT211048B (de) * 1958-10-02 1960-09-10 Alois Schmid Verfahren zum Schmelzen von schmelzbarem Gut und Schachtofen zur Durchführung dieses Verfahrens
US3074706A (en) * 1958-08-09 1963-01-22 Schmid Alois Method for carrying out endothermic processes in a shaft furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US71776A (en) * 1867-12-03 Improvement in furnaces for roasting and reducing ores
US166977A (en) * 1875-08-24 Improvement in furnaces for ssvieltimg ore
US3074706A (en) * 1958-08-09 1963-01-22 Schmid Alois Method for carrying out endothermic processes in a shaft furnace
AT211048B (de) * 1958-10-02 1960-09-10 Alois Schmid Verfahren zum Schmelzen von schmelzbarem Gut und Schachtofen zur Durchführung dieses Verfahrens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4948364A (en) * 1986-06-10 1990-08-14 Thompson Jeffery L Lime kilns
CN1035172C (zh) * 1991-04-27 1997-06-18 夫拉迪米尔·尼古拉维奇·多果波洛夫 建筑制品制造方法和设备

Also Published As

Publication number Publication date
DE1252850B (de) 1967-10-26
FR1454858A (fr) 1966-02-11
AT248941B (de) 1966-08-25
GB1089988A (en) 1967-11-08

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