US3824069A - Method of increasing the cooling effect of a rotary kiln-satellite cooler and device for carrying out the method - Google Patents

Method of increasing the cooling effect of a rotary kiln-satellite cooler and device for carrying out the method Download PDF

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Publication number
US3824069A
US3824069A US00339582A US33958273A US3824069A US 3824069 A US3824069 A US 3824069A US 00339582 A US00339582 A US 00339582A US 33958273 A US33958273 A US 33958273A US 3824069 A US3824069 A US 3824069A
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United States
Prior art keywords
supply line
satellite
rotary kiln
nozzles
liquid supply
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Expired - Lifetime
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US00339582A
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English (en)
Inventor
K Brachthauser
J Langmaack
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Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/40—Planetary coolers
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0081—Cooling of charges therein the cooling medium being a fluid (other than a gas in direct or indirect contact with the charge)
    • F27D2009/0083—Cooling of charges therein the cooling medium being a fluid (other than a gas in direct or indirect contact with the charge) the fluid being water
    • F27D2009/0086—Cooling of charges therein the cooling medium being a fluid (other than a gas in direct or indirect contact with the charge) the fluid being water applied in spray form

Definitions

  • ABSTRACT Method of increasing the cooling effect of a rotary kiln-satellite cooler includes, periodically injecting a cooling liquid from stationary nozzles, in synchronism with the rotary speed of the rotary kiln into the interior of the satellite tubes of the cooler through cooling air inlets formed at an end of the satellite tubes; and device for carrying out the method includes at least one cooling liquid supply line, at least one nozzle connected thereto and adapted to discharge a liquid jet having an axis spaced from the axis of rotation of the rotary kiln substantially equal to the spacing of the central axis of the satellite tubes therefrom, the nozzle having an outlet spaced slightly from the plane of rotation of air inlet ends of the satellite tubes, and at least one periodically operable valve connected to the liquid supply line.
  • the invention relates to a method of increasing the cooling effect of a rotary kiln-satellite cooler and a device for carrying out the method.
  • Satellite coolers for rotary kilns are formed of several satellite tubes are disposed in the vicinity of the discharge end of the rotary kiln, uniformly distributed about the periphery of the rotary kiln, and are connected with the interior of the rotary kiln through communicating openings.
  • the satellite tubes have as their objective the division of the flow of material discharging from the rotary kiln into several partial flows having correspondingly increased surface so that the material traversing the satellite tubes is cooled in counter-flow by cold air flowing into the discharge end of the satellite tubes due to the draught.
  • the air which is thereby heated finally enters the rotary kiln through the communicating openings, and serves as preheated combustion air for the rotary kiln furnace.
  • the quantity of air available for cooling is consequently limited so that, especially for relatively large kiln units, it can happen that cooled material discharging from the satellite tubes still has too high a temperature for the subsequent after-treatment.
  • a method of increasing the cooling effect of a rotary kiln-satellite cooler which comprises periodically injecting a cooling liquid, preferably water, from stationary nozzles, in synchronism with the rotary speed of the rotary kiln, into the interior of the satellite tubes of the cooler through cooling air inlets formed at an end of the satellite tubes.
  • the cooling liquid is simultaneously sprayed into a respective part of the satellite tubes that are located opposite one another with respect to or on either side of the axis of the rotary kiln.
  • the respective satellite tubes which project into the combustion chamber of the rotary kiln are traversed by a gas flow, varying as a result of the water injection, that is introduced substantially symmetrically into the rotary kiln, so that no disadvantageous effects are produced on the guidance of the rotary kiln flame and the flow relationships of the air or gas in the vicinity of the junctions of the satellite tubes with the rotary kiln.
  • the cooling liquid is supplied to the individual nozzles through a common pressurized liquid supply manifold or collecting chamber.
  • the cooling liquid is injected, respectively at an instant and for a period of time which is dependent or contingent uponthe rotary speed of the rotary kiln.
  • a device for carrying out the foregoing method of increasing the cooling effect of a rotary kiln-satellite cooler wherein the satellite cooler includes satellite tubes respectively having an air inlet end at which an axially directed air inlet opening is located, that comprises at least one cooling liquid supply line, at least one nozzle connected to the liquid supply line and adapted to discharge a liquid jet having an axis spaced from the axis of rotation of the rotary kiln substantially equal to the spacing of the-central axis of the satellite tubes therefrom, the nozzle having an outlet spaced slightly from the plane of rotation of the air inlet ends of the satellite tubes and at least one periodically operable valve connectedto the liquid supply line.
  • This construction of the device of the invention permits the injection instant and the injection period to be accurately determined especially for a suitable control device for the actuation of the valve, so that the liquid exclusively enters the interior space of the satellite tube and engages the layer of material therein which is to be cooled.
  • the liquid supply line extends substantially circularaly with reference to or coaxially with the kiln axis, and a multiplicity of nozzles is disposed at spaced locations along the length of the liquid supply line, and a multiplicity of valves is respectively connected between the nozzles and the liquid supply line.
  • This construction of the device of the invention permits all or only individual valves or valve groups to be actuated through a suitable control system for the valves, the delay of the injecting or spraying operation due to the required acceleration of the quantities of liquid can be maintained substantially equal for all of the nozzles due to the substantially ring-shaped or circular liquid supply line which serves as an initially pressurized liquid manifold or collecting chamber. With suitable dimensioning of the liquid volume contained in the supply line and with a suitably high pressure in this supply line, the acceleration process is capable of being considerably shortened.
  • pump means having a pressure side and a suction side, the liquid supply line being connected to the'pressure side of the pump means and forming part of a circulatory loop, the circulatory loop having a' downstream end connected through the intermediary of a pressure-reducing valve with the suction side of the pump means.
  • a control device having a preferably electrically or electromagnetically operative drive connected to the control device and one or more preferably electrically or electromagnetically operative pulse transmitters operatively associated with the rotary kiln and connected to the control device for transmitting pulses thereto.
  • This construction of the device of theinvention provides an automatic adjustment or matching of the injection instant and injection period to the rotary speed of the rotary kiln.
  • F lGfl is a diagrammatic, fragmentary longitudinal sectional view of a rotary kiln with a satellite cooler constructed in accordance with the invention.
  • FIG. 2 is a cross-sectional view of FIG. 1 taken along the line lllI in the direction of the arrows showing a preferred disposition of the supply line for the satellite cooler.
  • a rotary kiln structure which includes a rotary kiln 1 provided with an extension 2 in the material discharge region of the kiln 1, so that both the discharge region as well as the extension 2 are respectively supported by races 3 and 4 on roller stations.
  • Communication or passageway openings 5 are provided in the kiln wall in the discharge region of the rotary kiln 1, satellite tubes 7 being connected by means of a transfer pipe 6 to the openings 5.
  • the satellite tubes 7 are supported on the extension 2 and lead with the discharge end thereof into a discharge housing 8.
  • the following mode of. operation of the satellite cooler results:
  • each satellite tube is constructed so thatthe cooled kiln material can fall into the discharge housing 8 through a discharge grating 9 secured to the satellite tube 7. Due to the kiln draft, the cooling air is admitted into each satellite tube 7 through a respective axially-directed air inlet opening 10 located at the discharge end of the rotary kiln 1. Cooling of the material occurs due to the air which sweeps over the surface of the material.
  • the sucked-in quantity of cooling air is limited because it corresponds substantially to the amount of required combustion air and depends upon the rotary speed adjustment of the exhaust gas blower afterconnected to the rotary kiln, and which is in induced draft operation. For this reason, the hot kilnmaterial is able to be cooled only to temperatures that are still for further transfer, for a possible intermediate storage, and the like.
  • the cooling effect of such a satellite cooler is intensified in that, depending upon the height of the desired ultimate temperature of the material, in addition to the cold air admitted into the satellite tubes, water is sprayed onto the layer of material present in the satellite tubes so that additional quantities of heat are withdrawn from the material through the required heat of vaporization.
  • a supply line 11 substantially annularly surrounding the rotary kiln 1 is disposed in the vicinity of the discharge housing 8 at the end face forward of the discharge or outlet ends of the satellite tubes 8.
  • one end of the supply line 11 is connected to the pressure side of a pump 12, while the other end thereof is connected through a pressure-reducing valve 13 to the suction side of the pump 12.
  • Several nozzles 14 (FIG. 1) are connected through the intermediary of respective valves 15 to the annular supply line 11 so that the direction of the jets discharged from the nozzles 14 extends substantially in the axial direction of the satellite tubes.
  • the number of the nozzles 14 depends upon the quantity of water necessary for cooling the material.
  • the valves 15 are preferably magnetic valves, according to the invention, because the latter open and close rapidly, on the one hand, and from control engineering standpoint are relatively easy to actuate, on the other hand.
  • the cooling liquid usually water
  • the cooling liquid is pumped through the supply line in the circulatory loop so that even when the nozzles 14 are closed, the water has a suitable flow velocity.
  • the delay occurring when the valves 15 are opened, and which is caused by the required acceleration of the quantities of liquid in the supply line and in the branch lines to the nozzles 14, is thereby considerably reduced.
  • one or more pulse transmitters 16 are connected to the rotary kiln jacket or casing and cooperate with one or more pulse receivers 17.
  • the pulse receiver or receivers 17 are connected to a control device 18, to which also control lines 19 to drives for the individual valves 15 are connected.
  • valves 15, such as magnetic valves, for example, connected forward of the nozzles 14, are briefly opened, the length of the period during which they are open being adjustable within specific limits through a suitable construction of the control device 18, which is obvious to any man of ordinary skill in the art.
  • the nozzles 14 combined in groups oppose one another symmetrically with regard to the kiln axis so that the control of the gas flow, within the satellite tubes subjected to water, which proceeds through the passageway openings 5 into the kiln chamber, the control resulting from the vaporizing process, produces substantially symmetrical flow relationships within the kiln chamber in the vicinity of the furnace.
  • a further possibility for influencing or controlling the cooling effect is attained in an embodiment of the invention wherein the spacing between two respective adjacent nozzles 14, as viewed in rotary direction of the kiln 1, is smaller than the inner diameter of the air inlet openings of the satellite tubes 7.
  • the control device 18 controls the valves of the individual nozzles 14 through the pulse transmitters so that the open nozzle which happens to be located yet forward of the free cross section of the air inlet opening is closed when the next nozzle, as viewed in rotary direction of the kiln, happens to attain a position in front of the free cross section of the air inlet opening 10.
  • the temperature sensor 20 emits a signal which is passed through a suitable transmitter 21 with a nominal value adjustment or comparison, and then to the control device 18.
  • the injection period of the individual nozzles 14 is then varied by the control device 18 and, to the extent that the injection period, with respect to the rotary speed of the kiln, is not to be increased any more, the number of the operating nozzles 14 is increased, the quantity of water delivered by each nozzle 14, during the opening or injection period thereof, being virtually determined by the known nozzle cross section and the assumed water pressure in the supply line 11.
  • control valve for controlling the total water quantity is substituted for the pump.
  • This control valve can also be connected directly through suitable converters or transducers and control devices with the temperature sensor 20. The construction of the control device 18 is thereby simplified.
  • the invention of the instant application is not limited to the aforedescribed embodiment.
  • it is sufficient, in accordance with the invention, to provide a simple supply line without any circulatory flow conduction of the water with suitably disposed nozzles the simple supply line being merely connected with a suitable pressurized water supply device.
  • a suitable pressurized water supply device Depending upon the quantity of water being injected, it can be sufficient to connect one valve in the supply line proper directly forward of the first nozzle, so that, upon opening this single nozzle, all of the nozzles are subjected to the supply of water.
  • it is sufficient for effecting quantity control to furnish individual nozzles or nozzle groups with shut-off or check valves that are manually actuated.
  • several separate supply lines, respectively, for groups of nozzles can also be employed.
  • the invention of the instant application is furthermore not limited to the aforedescribed previously or initially pressurized supply of water, but rather, socalled two-substance nozzles are capable of being used in a similar manner, and can, for example, be subjected to compressed air as energy carrier so that when the valve is opened, a corresponding quantity of water is entrained by the compressed air and, respectively,
  • Method of increasing the cooling effect of a rotary kiln-satellite cooler which comprises the step of injecting a cooling liquid from stationary nozzles, in synchronism with the rotary speed of the rotary kiln, into the interior of the satellite tubes of the cooler through cooling air inlets formed at an end of the satellite tubes; and repeating the foregoing step periodically.
  • Method according to claim 1 which includes the step of simultaneously spraying the cooling liquid into arespective part of the satellite tubes that are located opposite one another'o'n either side of the axis of the rotary kiln.
  • Method according to claim 1 which comprises step of feeding the cooling liquid to the nozzles individually through a common pressurized liquid supply manifold.
  • Method according to claim 1 which comprises injecting the cooling liquid, respectively, at an instant and for a period dependent upon the rotary speed of the rotary kiln.
  • Method according to claim 1 which comprises the step of discharging from the satellite tubes material that has been processed in the rotary kiln, and the step measuring the total quantity of water to be sprayed into the satellite tubes contingent upon the final temperatures of the material processed in the rotary kiln after the material has been discharged from the satellite tubes.
  • Method according to claim 5 which comprises feeding the cooling liquid to individual nozzles through a common pressurized supply line, and the step of controlling the prevailing water pressure in the supply line contingent upon the final temperature of the material.
  • Device for carrying out a method of increasing the the satellite cooler includes satellite tubes respectively having an air inlet end at which an axially directed air inlet opening is located, comprising at least one cooling liquid supply line, at least one nozzle connected to said liquid supply line and adapted to discharge a liquid jet having an axis spaced from the axis of rotation of the rotary kiln substantially equal to the spacing of the central axis of said satellite tubes therefrom, said nozzle having amoutlet spaced slightly from the plane of rotation of the air inlet ends of said satellite tubes, and at least one periodically operable valve connected to said liquid supply line.
  • liquid supply line extends substantially circularly with reference to said kiln axis, and including a multiplicity of nozzles disposed at spaced locations along the length of said liquid supply line and a multiplicity of valves respectively connected between said nozzles and said liq-f uid supply line.
  • Device including pump means having a pressure side and a suction side, said liquid supply line being connected to said pressure side of said pump means and forming part of a circulatory loop, said circulatory loop having a downstream end connected through the intermediary of a pressurereducing valve with the suction side of said pump means.
  • Device including a control device, said valve having a drive connected to said control device, and at least one pulse transmitter operatively associated with the rotary kiln and connected to said control device for transmitting a pulse thereto.
  • valve drive and said pulse transmitter are electrically operative.
  • valve drive and said pulse transmitter are electromagnetically operative.
  • Device including a multiplicity of nozzles connected to said liquid supply line and spaced one from the other, the spacing between respective adjacent nozzles in rotary direction of the kiln being smaller than the inner diameter of the air inlet opening of said satellite tubes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
US00339582A 1972-03-09 1973-03-09 Method of increasing the cooling effect of a rotary kiln-satellite cooler and device for carrying out the method Expired - Lifetime US3824069A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2211264A DE2211264C3 (de) 1972-03-09 1972-03-09 Vorrichtung zur Erhöhung der Kühlwirkung eines Drehofen-Satellitenkühlers und Verfahren zum Betreiben derselben

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US3824069A true US3824069A (en) 1974-07-16

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US00339582A Expired - Lifetime US3824069A (en) 1972-03-09 1973-03-09 Method of increasing the cooling effect of a rotary kiln-satellite cooler and device for carrying out the method

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US (1) US3824069A (xx)
JP (1) JPS5521276B2 (xx)
AR (1) AR196918A1 (xx)
AT (1) AT324194B (xx)
AU (1) AU5301673A (xx)
BE (1) BE796579A (xx)
BR (1) BR7301688D0 (xx)
CA (1) CA1004851A (xx)
CS (1) CS197201B2 (xx)
DD (1) DD103054A5 (xx)
DE (1) DE2211264C3 (xx)
DK (1) DK139993C (xx)
FR (1) FR2175485A5 (xx)
GB (1) GB1405985A (xx)
IT (1) IT979727B (xx)
NL (1) NL7303235A (xx)
PL (1) PL84318B1 (xx)
RO (1) RO63307A (xx)
TR (1) TR17415A (xx)
ZA (1) ZA731621B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918891A (en) * 1973-05-09 1975-11-11 Smidth & Co As F L Cooler system for rotary kiln and method
US3942942A (en) * 1973-07-28 1976-03-09 Klockner-Humboldt-Deutz Ag Rotary tubular furnace
DE3210643A1 (de) * 1982-03-23 1983-10-06 Krupp Polysius Ag Drehrohrofen mit planetenkuehler
US4457705A (en) * 1981-09-02 1984-07-03 Klockner-Humboldt-Deutz Ag Calcining system for the manufacture of cement clinker and the like
US4654004A (en) * 1984-12-03 1987-03-31 Onoda Cement Company, Ltd. Controller for clinker cooler
US5562443A (en) * 1992-11-12 1996-10-08 F. L. Smidth & Co. A/S Rotatable cooler for a rotary kiln plant
US6474985B1 (en) * 2002-04-17 2002-11-05 Metso Minerals Industries, Inc. Toothed grate for rotary kiln peripheral discharge openings
US20060166152A1 (en) * 2005-01-21 2006-07-27 Damien Feger Gas incinerator installed on a liquefied gas tanker ship or a liquefied gas terminal
ES2272122A1 (es) * 2004-06-11 2007-04-16 Fundiciones Del Estanda, S.A. Sistema de enfriamiento del clinker para la fabricacion de cemento.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2550475C3 (de) * 1975-11-11 1982-01-28 Bühler-Miag GmbH, 3300 Braunschweig Brenn- und Kühleinrichtung für Zementklinker oder anderes pulveriges oder körniges Gut

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1379083A (en) * 1921-05-24 clevenger
US2136174A (en) * 1936-08-06 1938-11-08 Smidth & Co As F L Kiln
US2483738A (en) * 1944-11-09 1949-10-04 Smidth & Co As F L Cooler
US3512764A (en) * 1967-06-20 1970-05-19 Smidth & Co As F L Rotary kiln having planetary cooling tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1379083A (en) * 1921-05-24 clevenger
US2136174A (en) * 1936-08-06 1938-11-08 Smidth & Co As F L Kiln
US2483738A (en) * 1944-11-09 1949-10-04 Smidth & Co As F L Cooler
US3512764A (en) * 1967-06-20 1970-05-19 Smidth & Co As F L Rotary kiln having planetary cooling tubes

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918891A (en) * 1973-05-09 1975-11-11 Smidth & Co As F L Cooler system for rotary kiln and method
US3942942A (en) * 1973-07-28 1976-03-09 Klockner-Humboldt-Deutz Ag Rotary tubular furnace
US4457705A (en) * 1981-09-02 1984-07-03 Klockner-Humboldt-Deutz Ag Calcining system for the manufacture of cement clinker and the like
DE3210643A1 (de) * 1982-03-23 1983-10-06 Krupp Polysius Ag Drehrohrofen mit planetenkuehler
US4654004A (en) * 1984-12-03 1987-03-31 Onoda Cement Company, Ltd. Controller for clinker cooler
US5562443A (en) * 1992-11-12 1996-10-08 F. L. Smidth & Co. A/S Rotatable cooler for a rotary kiln plant
US6474985B1 (en) * 2002-04-17 2002-11-05 Metso Minerals Industries, Inc. Toothed grate for rotary kiln peripheral discharge openings
ES2272122A1 (es) * 2004-06-11 2007-04-16 Fundiciones Del Estanda, S.A. Sistema de enfriamiento del clinker para la fabricacion de cemento.
US20060166152A1 (en) * 2005-01-21 2006-07-27 Damien Feger Gas incinerator installed on a liquefied gas tanker ship or a liquefied gas terminal
US7836835B2 (en) * 2005-01-21 2010-11-23 Snecma Gas incinerator installed on a liquefied gas tanker ship or a liquefied gas terminal

Also Published As

Publication number Publication date
GB1405985A (en) 1975-09-10
DD103054A5 (xx) 1974-01-05
JPS491416A (xx) 1974-01-08
CS197201B2 (en) 1980-04-30
FR2175485A5 (xx) 1973-10-19
DK139993B (da) 1979-05-28
TR17415A (tr) 1975-03-24
RO63307A (fr) 1978-07-15
AU5301673A (en) 1974-09-12
AT324194B (de) 1975-08-25
DK139993C (da) 1979-10-29
JPS5521276B2 (xx) 1980-06-09
NL7303235A (xx) 1973-09-11
BE796579A (fr) 1973-07-02
AR196918A1 (es) 1974-02-28
CA1004851A (en) 1977-02-08
PL84318B1 (xx) 1976-03-31
ZA731621B (en) 1973-12-19
DE2211264A1 (de) 1973-09-20
DE2211264C3 (de) 1981-07-02
DE2211264B2 (de) 1976-05-20
IT979727B (it) 1974-09-30
BR7301688D0 (pt) 1974-08-29

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