US3704525A - Material cooler with recycling of cooling gas - Google Patents

Material cooler with recycling of cooling gas Download PDF

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Publication number
US3704525A
US3704525A US193027A US3704525DA US3704525A US 3704525 A US3704525 A US 3704525A US 193027 A US193027 A US 193027A US 3704525D A US3704525D A US 3704525DA US 3704525 A US3704525 A US 3704525A
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Prior art keywords
air
cooling
chamber
recirculation
cooling gas
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US193027A
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English (en)
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Daniel T Devel
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Fuller Co
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Fuller Co
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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: SECURITY PACIFIC BUSINESS CREDIT INC.
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Assigned to FULLER COMPANY reassignment FULLER COMPANY RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BARCLAYS BUSINESS CREDIT, INC., A CORP OF CT
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    • 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
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate

Definitions

  • the other recirculation circuit returns air to the plenum chamber at points where It will pass 2,587,378 2/1952 Petersen ..263/44 through the material and some of it be conducted 2,846,778 8/ 1958 Marklemi r to a furnace, while the remaining air will be returned 3,276,755 10/1966 Bast t R to the recirculation circuit.
  • An indirect heat 3,522,012 7/1970 Blann R exchanger is mounted in one of the recirculation ircuits.
  • the prior art cooler described in U. S. Pat. No. 2,846,778 has the advantage of air quenching cement clinker as it is discharged from a rotary kiln, and the further advantage that a portion of the cooling air which is heated as it cools the hot cement clinker from a temperature of about 2500 F to about 150 F can be returned to the furnace as combustion air. Since this air is already heated, the system can result in substantial fuel savings in the cement making process.
  • a particular disadvantage of the arrangement shown in the above mentioned prior patent is that only a portion of the air needed for cooling the hot material can be returned to the furnace. The remaining air must be exhausted to atmosphere. However, as the cooling air passes through the hot material, it entrains dust and solid materials which must be removed from the exhausted air in order to avoid polluting the atmosphere. In order to remove these pollutants, high efficiency dust collectors such as bag houses or electrostatic precipitators must be used. These high efficiency collectors add great expense to a cooler installation.
  • apparatus for cooling hot particulate material such as cement clinker discharged from a furnace such as a kiln
  • a housing having an inlet for material to be cooled and an outlet for cooled material
  • porous grate means mounted in and dividing said housing into an upper material chamber and a lower plenum chamber; said porous grate means being adapted to support a bed of material in the material chamber; means dividing the plenum chamber into a plurality of compartments; first blower means for supplying ambient cooling gas to at least one of said compartments for passage through said porous grate means and the bed of material for cooling the material; first recirculation means for exhausting at least some of the ambient cooling gas from said material chamber after it passes through the material and recirculating it to at least one of said compartments for passage through the porous grate and material for cooling the material; and second recirculation means for exhausting at least some of the ambient cooling gas from said material chamber after it passes through the material
  • FIG. 1 is a diagrammatic view of one form of the prior art
  • FIG. 2 is a diagrammatic view of another form of the prior art.
  • FIG. 3 is a generally diagrammatic view of the cooling apparatus of the present invention.
  • a cooler for hot material such as cement clinker which has been in use for some time and may be of the type shown in U. S. Pat. No. 2,846,778. It includes a housing 1 which is divided into an upper material chamber 3 and a lower plenum chamber 4 by means of a porous grate means 6.
  • the grate means 6 may be of the type shown in the above mentioned patent and includes a plurality of alternately stationary and reciprocating grates for supporting a bed 8 of particulate material to be cooled and advancing the material through the cooler.
  • the cooler is provided with a material inlet 10 for receiving hot material from a furnace such as a rotary kiln (not shown).
  • the cooler also includes an outlet 12 for cooled material.
  • the plenum chamber is divided into a plurality of compartments and ambient cooling air is supplied to these compartments from suitable blowers (not shown) as indicated by the arrows 14.
  • the cooling air passes through the'porous grates and material bed to cool the material.
  • the amount of air which is required to cool cement clinker is about three times the amount of combustion air which can be used by the rotary kiln used in the clinkering process.
  • the amount of air needed to cool the clinker is taken as 3N and the amount of air which can be used by the kiln is 1N, then the amount of air exhausted to atmosphere is 2N.
  • FIG. 2 there is shown a prior art arrangement which attempts to eliminate the dust collection system by recirculating the air which would be vented to atmosphere in the system of FIG. 1.
  • the cooler itself is similar to that of FIG. 1 and like parts have been designated with like numerals.
  • ambient cooling air is blown through the coolest material in the cooler as indicated by arrow by blowers (not shown).
  • This air is exhausted through exhaust conduit 16 and conducted by a suitable conduit 22 to be blown through the hottest zone of the cooler 1 as indicated by arrow 21.
  • This air is then returned to the kiln as combustion air as indicated by arrow 23.
  • the cooler includes a gas permeable grate means 32 dividing the housing into an upper material chamber 34 and a lower plenum chamber 36.
  • the porous grate means may be similar to that shown in U.S. Pat. No. 2,846,778 and serves to support a bed 33 of material to be cooled and advance the material through the cooler.
  • the housing is provided with a material inlet 38 for receiving material to be cooled such as cement clinker from a furnace such as a rotary kiln (not shown).
  • the housing also includes a material outlet 40 for discharging cooled material from the apparatus.
  • a breaker 42 of any well-k nown type is positioned in the outlet 40.
  • the plenum 36 is divided into a plurality of compartments 44, 46, 48, 50, 52 and 54 by divider means 45, 47, 49, 51 and 53. Blowers 56, 58, 60, 62, 64 and 66 are flow connected to the compartments 44, 46, 48, 50, 52 and 54 respectively for supplying cooling gas to the plenum 36 for passage through the porous grate 32 and bed of material 33 to cool the material.
  • the material chamber 34 may be considered to be divided into three zones 70, 72 and 74 and indicated by the broken lines. There is no actual physical division of the chamber 34.
  • the zone 70 represents the zone of hottest material
  • the zone 74 represents the zone of coolest material
  • the zone 72 has material of intermediate temperature.
  • Ambient cooling air is supplied by blower means 56 and compartment 44 to the hottest zone 70 to provide an initial air quench of the hot material admitted to the cooler. This air is heated by the hot material and returned to the furnace as combustion air through a suitable conduit such as material inlet 38 as shown by arrow 76.
  • Ambient cooling air is also supplied by blower means 66 and compartment 54 to the coolest zone 74 and to the intermediate zone 72. This ambient air serves to achieve the final cooling of the material.
  • Some of the air which passes from compartment 54 through the porous grate 32 and bed of material is exhausted from the zone 74 of chamber 34 through an outlet 78 and a first recirculation system 80 which includes a duct 81 connected to a dust collector 82.
  • a stack 84 with a control damper 86 may be provided to permit adjustment during start-up periods and to ensure operational safety in case of irregular material feed or unstable conditions.
  • the recirculated air is supplied to blower means 58 by duct 88.
  • a bleed input valve 87 may be provided to add cool ambient air to the recirculated air during start-up and periods of unstable operation.
  • the recirculated air is directed into zone 70 and after passing through the hot material, is conducted to the furnace as hot combustion air along with the air supplied by blower means 56.
  • the second recirculation means 90 includes a hood 92 mounted in the zone 72 for collecting cooling air which passes through the material in that zone.
  • a duct 94 is flow connected to the hood 92 and conducts the exhausted air to dust collector 96.
  • a bleed valve 95 may be provided for admitting cold air during start-up and periods of unstable operation.
  • Air discharged from the collector 96 is divided into three parts in the embodiment shown as illustrated by conduits 98, 99 and 100.
  • An indirect heat exchanger 102 is mounted in each of the ducts 98, 99 and 100 for cooling the air exhausted from the intermediate zone 7 2.
  • the ducts 98, 99 and 100 supply the thus cooled air to blowers 60, 62 and 64, respectively. 8
  • compartments 44 to 54 and partitions 45 to 53 are positioned so that there is a mixing of ambient cooling air and recirculated cooling air. This mixing of the cooling air insures a renewal of the cooling air and a continuous operation of the system.
  • the temperature T of air in zone 70 is about 870 C; the temperature 0 of air in zone 72 is about 300 C; and the temperature t of air supplied to compartment 46 is about 120 C.
  • the fans or blowers 56 to 62 have the following capacities:
  • compartment 48 received 0.45 Nm lkg air and delivers about 0.14 Nm lkg air to zone 70 and about 0.31 Nm /kg air to zone 72.
  • Compartment 54 receives a volume of ambient air of 0.59 Nm /kg and is believed to deliver 0.14 Nm /kg to zone 72 and 0.45 Nm /kg to zone 74.
  • a housing having an inlet for material to be cooled and an outlet for cooled material
  • porous grate means mounted in and dividing said housing into an upper material chamber and a lower plenum chamber;
  • porous grate means being adapted to support a bed of material in the material chamber
  • first blower means for supplying ambient cooling gas to at least one of said compartments for passage through said porous grate means and the bed of material for cooling the material;
  • first recirculation means for exhausting at least some of the ambient cooling gas from said material chamber after it passes through the material and recirculating it to at least one of said compartments for passage through the porous grate and material for cooling the material;
  • second recirculation means for exhausting at least some of the ambient cooling gas from said material chamber after it passes through the material and recirculating it to at least one of said compartments for passage through the porous grate and material for cooling the material;
  • said second recirculation means being adapted to exhaust from said material chamber at least some of
  • the total quantity air in Nm /kg of material which is returned to the kiln as combustion air is 0.31 0.45 0.14 or 0.90 Nm lkg.
  • the total air used for cooling the material is the sum of the volume of air supplied to the compartments 44 to 54 which is 2.92 Nm /kg or about three times the volume returned to the kiln.
  • the volume of ambient air supplied to the system by blowers 56 and 66 equals the volume returned to the kiln.
  • the volume of air used to cool the material can be maintained at an effective level of about three times the amount of air which may be returned to the furnace without requiring venting to atmosphere.
  • the need for expensive, high efficiency dust collectors has been eliminated.
  • the collectors 82 and 96 need only be relatively inexpensive mechanical collectors.
  • Apparatus for cooling hot particulate material such as cement clinker discharged from a furnace such as a kiln comprising:
  • conduit means for conducting at least some of the cooling gas from said material chamber to a furnace after it passes through said material.
  • the apparatus of claim 5 further comprising second blower means for supplying ambient cooling gas to at least one of said compartments for passage through said porous grate means and bed of material.
  • each of said first and second recirculation means includes means for supplying ambient air to the cooling gas after it is exhausted from the material'chamber and before it is recirculated to said compartment.
  • the apparatus of claim 8 further comprising dust collector means mounted in each of said first and second recirculation means.
  • said second recirculation means includes hood means mounted in said material chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
US193027A 1970-11-06 1971-10-27 Material cooler with recycling of cooling gas Expired - Lifetime US3704525A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7040103A FR2112750A5 (enrdf_load_stackoverflow) 1970-11-06 1970-11-06

Publications (1)

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US3704525A true US3704525A (en) 1972-12-05

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ID=9063912

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Application Number Title Priority Date Filing Date
US193027A Expired - Lifetime US3704525A (en) 1970-11-06 1971-10-27 Material cooler with recycling of cooling gas

Country Status (6)

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US (1) US3704525A (enrdf_load_stackoverflow)
DE (1) DE2154771A1 (enrdf_load_stackoverflow)
ES (1) ES396656A1 (enrdf_load_stackoverflow)
FR (1) FR2112750A5 (enrdf_load_stackoverflow)
GB (1) GB1335307A (enrdf_load_stackoverflow)
IT (1) IT942784B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892044A (en) * 1973-02-14 1975-07-01 Peters Ag Claudius Method and apparatus for cooling
JPS51151844A (en) * 1975-06-13 1976-12-27 Waagner Biro Ag Manner and apparatus for cooling high temperature masses
US4337083A (en) * 1979-10-22 1982-06-29 Asarco Incorporated Non-polluting, cooling method and heat recuperative sintering method
US4371150A (en) * 1979-11-02 1983-02-01 Sumitomo Heavy Industries, Inc. Sintering plant
US4501412A (en) * 1979-10-22 1985-02-26 Asarco Incorporated Non-polluting heat recuperative sintering method and apparatus
US4624636A (en) * 1984-04-05 1986-11-25 Fuller Company Two stage material cooler
US4654004A (en) * 1984-12-03 1987-03-31 Onoda Cement Company, Ltd. Controller for clinker cooler
EP0170304A3 (en) * 1984-06-30 1989-10-11 Metallgesellschaft Ag Clinker cooler with dedusting device in a process for the production of cement
US5024005A (en) * 1988-11-23 1991-06-18 Seaford Nominees Pty. Ltd. Dewatering means
US20090325115A1 (en) * 2005-12-30 2009-12-31 Kang Seung Gu Vertical furnace for fabrication of fine artificial lightweight aggregates
US20110159449A1 (en) * 2009-12-31 2011-06-30 Flsmidth A/S Integrated Material Cooler and Heat Recovery Exchanger Apparatus and Process
US20210323864A1 (en) * 2018-09-10 2021-10-21 Thyssenkrupp Industrial Solutions Ag Cooler for cooling clinker and method for operating a cooler for cooling clinker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3131514C1 (de) * 1981-08-08 1988-09-08 Karl von Dipl.-Ing. Dipl.-Wirtsch.-Ing. 3057 Neustadt Wedel Verfahren zum Kuehlen von Kuehlgutbetten und Stauvorrichtung zur Durchfuehrung des Verfahrens
DE102006026234A1 (de) * 2006-06-06 2007-12-13 Polysius Ag Vorrichtung und Verfahren zum Kühlen von Schüttgut

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587378A (en) * 1949-12-30 1952-02-26 Smidth & Co As F L Method of cooling bulk material
US2846778A (en) * 1957-04-09 1958-08-12 Fuller Co Horizontal heat-exchange apparatus
US3276755A (en) * 1964-07-20 1966-10-04 Fuller Co Kiln system and method
US3522012A (en) * 1967-03-17 1970-07-28 Allis Chalmers Mfg Co Apparatus for mineral beneficiation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587378A (en) * 1949-12-30 1952-02-26 Smidth & Co As F L Method of cooling bulk material
US2846778A (en) * 1957-04-09 1958-08-12 Fuller Co Horizontal heat-exchange apparatus
US3276755A (en) * 1964-07-20 1966-10-04 Fuller Co Kiln system and method
US3522012A (en) * 1967-03-17 1970-07-28 Allis Chalmers Mfg Co Apparatus for mineral beneficiation

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892044A (en) * 1973-02-14 1975-07-01 Peters Ag Claudius Method and apparatus for cooling
JPS51151844A (en) * 1975-06-13 1976-12-27 Waagner Biro Ag Manner and apparatus for cooling high temperature masses
US4337083A (en) * 1979-10-22 1982-06-29 Asarco Incorporated Non-polluting, cooling method and heat recuperative sintering method
US4501412A (en) * 1979-10-22 1985-02-26 Asarco Incorporated Non-polluting heat recuperative sintering method and apparatus
US4371150A (en) * 1979-11-02 1983-02-01 Sumitomo Heavy Industries, Inc. Sintering plant
US4624636A (en) * 1984-04-05 1986-11-25 Fuller Company Two stage material cooler
EP0170304A3 (en) * 1984-06-30 1989-10-11 Metallgesellschaft Ag Clinker cooler with dedusting device in a process for the production of cement
US4654004A (en) * 1984-12-03 1987-03-31 Onoda Cement Company, Ltd. Controller for clinker cooler
US5024005A (en) * 1988-11-23 1991-06-18 Seaford Nominees Pty. Ltd. Dewatering means
US20090325115A1 (en) * 2005-12-30 2009-12-31 Kang Seung Gu Vertical furnace for fabrication of fine artificial lightweight aggregates
US8202086B2 (en) * 2005-12-30 2012-06-19 Kyonggi University Industry & Academia Cooperation Foundation Vertical furnace for fabrication of fine artificial lightweight aggregates
US20110159449A1 (en) * 2009-12-31 2011-06-30 Flsmidth A/S Integrated Material Cooler and Heat Recovery Exchanger Apparatus and Process
US20210323864A1 (en) * 2018-09-10 2021-10-21 Thyssenkrupp Industrial Solutions Ag Cooler for cooling clinker and method for operating a cooler for cooling clinker
US12162808B2 (en) * 2018-09-10 2024-12-10 thyssenkrupp Polysius GmbH Cooler for cooling clinker and method for operating a cooler for cooling clinker

Also Published As

Publication number Publication date
FR2112750A5 (enrdf_load_stackoverflow) 1972-06-23
DE2154771A1 (de) 1972-05-25
IT942784B (it) 1973-04-02
ES396656A1 (es) 1974-05-16
GB1335307A (en) 1973-10-24

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Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., A CORP OF D

Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY, A DE CORP;REEL/FRAME:004659/0543

Effective date: 19861231

Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., 228 EAST 45

Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY, A DE CORP;REEL/FRAME:004659/0543

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

Effective date: 19881214

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Owner name: FULLER COMPANY, PENNSYLVANIA

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:SECURITY PACIFIC BUSINESS CREDIT INC.;REEL/FRAME:005251/0122

Effective date: 19881214

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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