US3537693A - System for connecting rotary kiln for treating materials to an installation for preheating the materials via the gases leaving the kiln - Google Patents

System for connecting rotary kiln for treating materials to an installation for preheating the materials via the gases leaving the kiln Download PDF

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Publication number
US3537693A
US3537693A US759837A US3537693DA US3537693A US 3537693 A US3537693 A US 3537693A US 759837 A US759837 A US 759837A US 3537693D A US3537693D A US 3537693DA US 3537693 A US3537693 A US 3537693A
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United States
Prior art keywords
kiln
materials
gases
ducting
preheating
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Expired - Lifetime
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US759837A
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English (en)
Inventor
Rene Bovagne
Gerard Deynat
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CREUSOT FORGES ATELIERS
FORGES ET ATELIERS DU CREUSOT SOC
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CREUSOT FORGES ATELIERS
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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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/2016—Arrangements of preheating devices for the charge
    • F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones

Definitions

  • FIG. 2 I a SYSTEM FOR'CONNECTING ROTARY KILN FOR TREATING MATERIALS TO AN INSTALLATION FOR PREHEATING THE MA'llINIM-S VIA THE GASES LEAVING THE KILN Filed Sent. 16, 1968
  • FIG. 2
  • Theinvention relates to a system for connecting a rotary kiln for treating materials to an installation for preheating'the materials via the gases leaving the kiln, the system being used more particularly in cement-producing installations.
  • Installations for preheating the raw materials comprise a series of separators connected by ducting in which the materials, which circulate in counter-current with the gases leaving the kiln, are successively brought into contact with the gases and then separated therefrom, so that the materials reach a temperature close to that of the gases leaving the kiln at the moment when the materials are introduced thereinto.
  • a smoke box which guides the gases towards the preheater inlet conduit.
  • the materials are introduced into the smoke box and descend along the inclined end thereof as far as the kiln inlet.
  • the feed conduit for the materials is continued so as to pour the materials directly into the kiln.
  • the smoke box is as a rule a simple connection chamber through which the gases flow which are then accelerated in the preheater ducting. -Most frequently no attempt has been made to improve the flow of the gases the result being dead zones in which the gases have a reduced speed, and in which the briquetting temperature is lower.
  • the volatile materials contained in the gases have a tendency to become condensed on the cool portions and to fix the dust entrained by the gases, thus necessitating periodical cleaning.
  • a chamber for evacuating the gases which encourages their flow from the kiln outlet to the preheater inlet by accelerating the gases from the kiln outlet onwards and keeping their speed identical at all places.
  • the gas flow thus accelerated from the kiln inlet onwards might cause the risk that materials poured into the kiln by the feed device might be entrained into the outlet conduit. This is the reason why measures must be taken not to pour out the materials opposite the kiln outlet aperture.
  • the chamebr for evacuating the gases is formed by substantially cylindrical elongated ducting disposed in the continuation of the outlet aperture for the kiln gases, and having at its two ends members for connecting it respectively to the end hood of the kiln and the inlet ducting of the gases to the preheater, the outlet aperture of the device feeding the materials being disposed inside the kiln, at a lower level than the lower edge of the outlet aperture of the kiln.
  • FIG. 1 illustrates diagrammatically the system according to the invention, sectioned along the line I-I in FIG. 3;
  • FIG. 2 is a section, taken along the line 11-11 in FIG. 3, the feed device being removed, and
  • FIG. 3 is a section, taken along the line III-III in FIG. 1.
  • a rotary kiln 1 terminates in an end 2 formed with a circular aperture 3.
  • the end of the kiln 1 engages in a fixed hood 4 having a joint 5 ensuring sealing-tightness between the kiln and the hood.
  • the raw materials treated in the kiln are heated, before their arrival in the kiln, in a known preheating installation by the hot gases leaving the kiln. Only the start of the ducting 6 and the last separator 7 of the known preheating installation are show in FIG. 1.
  • the ducting 6 is connected to the kiln outlet aperture 3 via an elongated cylindrical ducting 8 connected to the hood 4 and to the ducting 6 by connecting members 9 and 10 respectively.
  • the feed device comprises a collar which extends through the wall of the ducting 8 and in which outlet duct 12 of the separator 7 discharges, and a tube 13 which is closed in its upper portion and slides inside the collar 11.
  • the materials descending from the separator 7 via the duct '12 drop into the tube 13 through an oblong aperture 14 therein. It is therefore possible to regulate the height of the pouring aperture 15 is relation to the wall 1 of the kiln, by changing the position of the tube in the collar.
  • the ducting 8 has a diameter which is substantially smaller than that of the kiln, so that the gases are accelerated as soon as they leave the kiln and are channelled in the direction of the ducting 6.
  • the height of the tube 13 is so regulated that the aperture 15 is disposed substantially lower than the lower edge of the connecting member 9, and pours the materials as close as possible to the pile 16 formed by the materials entrained in the kiln.
  • the end of the tube is cut in a plane substantially parallel with the pile formed by the materials in normal operating conditions.
  • the outlet aperture is therefore outside the gas flow sucked into the ducting 8, and there is no risk that the materials will be entrained into this flow.
  • the connecting member 9 can be continued by a semi-cylindrical collar portion 17 which extends into the kiln as far as the tube 13 and is formed with a central groove for the passage of the tube.
  • the system can be used more particularly in preheating installations in which gases are recycled in a circuit adapted to regulate heat-exchangers.
  • the Wall of the ducting 8 is formed with two apertures 18 which are disposed on either side of the vertical plane of symmetry of the ducting and through which two conduits 19 extend which are connected to ducting 20 for feeding recycling gas taken at a place in the preheating circuit.
  • the conduits 19 are directed towards the aperture 3 and converge at a point situated substantially on the axis of the ducting 8, adjacent its inlet.
  • the blowing in of the recycling gases is therefore performed in counter-current with the gases leaving the kiln. Mixing is therefore rapidly performed from the ducting inlet onwards and in its axis.
  • the wall of the ducting is in contact only with gases at a regular temperature, and therefore has no zones of varying temperature, outside the apertures 18.
  • the apertures 18 are disposed in the upper portion of the ducting, so that any accretions which might be formed by concentration are entrained by the gases.
  • a register 22 is disposed in the ducting 20 upstream of the conduits 19, the register 22 being controlled by a control device 23 which measures the temperature of the gases at a place 24 disposed at the outlet of the ducting 8.
  • a narrowed portion 25 disposed at the outlet of the ducting 8 upstream of the connecting member 10 enables the gases to have a speed adequate to entrain the materials poured out by the distributor 21.
  • the ducting 8 can also comprise a register for insulating the preheater (not shown), which is disposed downstream of a branching aperture in the direction of a chimney used more particularly for lighting the kiln. Any materials which may accumulate in the end of the hood 4 are picked up in known manner by scoops 26 which are rotated by the kiln and deliver such materials in front of the inlet of the ducting 8; the gas flow then entrains the materials to the ducting 6 of the separator 7, which returns them to the kiln. The sucking of the dust into the ducting prevents the contamination of the hood at the end of the kiln.
  • the evacuation ducting or the tube for feeding the materials can have any further device for measuring the temperature or flow of the gases and materials, to regularise the feed and preheating of the materials.
  • devices for taking samples of the gas enabling kiln operation to be controlled could be installed at certain places.
  • a system for connecting a rotary kiln for the treatment of materials to an installation for preheating the materials by the gases leaving the kiln comprising a chamber for evacuating the gases leaving the kiln to the preheating installation, and a device for feeding to the kiln the materials coming from the preheating installation, the chamber for evacuating the gases being formed by substantially cylindrical elongated ducting disposed in the continuation of the outlet aperture for the kiln gases, and having at its two ends members for connecting it respectively to the end hood of the kiln and the inlet ducting of the gases to the preheater, the outlet aperture of the device feeding the materials being disposed inside the kiln, at a lower level than the lower edge of the outlet aperture of the kiln, the device for feeding the materials comprising a collar which is attached to the end of the outlet duct of the last separator of the preheater and extends through the Wall of the evacuation ducting, and a tube which is
  • the member for connecting the evacuation ducting to the end hood comprising a semi-cylindrical collar portion which is attached to the lower edge of the ducting and is continued into the kiln inlet aperture, said collar portion having a central groove for passage of said tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Incineration Of Waste (AREA)
US759837A 1968-02-20 1968-09-16 System for connecting rotary kiln for treating materials to an installation for preheating the materials via the gases leaving the kiln Expired - Lifetime US3537693A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR140574 1968-02-20

Publications (1)

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US3537693A true US3537693A (en) 1970-11-03

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US759837A Expired - Lifetime US3537693A (en) 1968-02-20 1968-09-16 System for connecting rotary kiln for treating materials to an installation for preheating the materials via the gases leaving the kiln

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US (1) US3537693A (me)
BE (1) BE728522A (me)
DE (1) DE1758852B2 (me)
ES (1) ES363562A1 (me)
FR (1) FR1562202A (me)
GB (1) GB1262159A (me)
RO (1) RO55405A (me)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089640A (en) * 1976-11-29 1978-05-16 Hawley Manufacturing Corporation Furnace hood with integral conveyor feeding

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012765A (en) * 1958-11-20 1961-12-12 Kloeckner Humboldt Deutz Ag Rotary kiln, particularly for the burning of cement raw material
US3042389A (en) * 1958-12-15 1962-07-03 Allis Chalmers Mfg Co Air seal for rotating cylinders such as kilns and the like
US3317201A (en) * 1964-04-13 1967-05-02 Polysius Gmbh Method of and arrangement for increasing the alkali content in alkali-laden dusts of flue gases

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE390068C (de) * 1922-10-22 1924-02-12 Polysius Fa G Vorrichtung zum Beschicken von Drehrohroefen mit Trockenmehl

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012765A (en) * 1958-11-20 1961-12-12 Kloeckner Humboldt Deutz Ag Rotary kiln, particularly for the burning of cement raw material
US3042389A (en) * 1958-12-15 1962-07-03 Allis Chalmers Mfg Co Air seal for rotating cylinders such as kilns and the like
US3317201A (en) * 1964-04-13 1967-05-02 Polysius Gmbh Method of and arrangement for increasing the alkali content in alkali-laden dusts of flue gases

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089640A (en) * 1976-11-29 1978-05-16 Hawley Manufacturing Corporation Furnace hood with integral conveyor feeding
DE2752565A1 (de) * 1976-11-29 1978-06-01 Hawley Manufacturing Corp Haube fuer oefen mit einer beschickungsoeffnung

Also Published As

Publication number Publication date
GB1262159A (en) 1972-02-02
DE1758852B2 (de) 1971-02-11
FR1562202A (me) 1969-04-04
DE1758852A1 (me) 1971-02-11
ES363562A1 (es) 1971-01-01
RO55405A (me) 1974-01-03
BE728522A (me) 1969-08-01

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