US3871631A - Burning device for burning ore pellets and similar bodies - Google Patents

Burning device for burning ore pellets and similar bodies Download PDF

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Publication number
US3871631A
US3871631A US308559A US30855972A US3871631A US 3871631 A US3871631 A US 3871631A US 308559 A US308559 A US 308559A US 30855972 A US30855972 A US 30855972A US 3871631 A US3871631 A US 3871631A
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zone
cooling
burning
water
cooling zone
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US308559A
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English (en)
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Siewert Gerrit Jan Biewinga
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Hoogovens Ijmuiden BV
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Hoogovens Ijmuiden BV
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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
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines

Definitions

  • ABSTRACT A burning device with a movable grid system for supporting a bed of ore pellets or the like for burning (baking) them, comprising in sequence one behind the other at least one drying zone, one burning zone and two cooling zones, and in which means are present for supplying water in the second cooling zone, characterized in that the first cooling zone at the discharge side of the cooling fluid, above the movable grid system, is connected by passages to the burning zone and the drying zone, and that the second cooling zone is passed in downward direction by the cooling fluid with the aid of a suction fan which is connected to a flue gas stack of the burning machine. This gives more efficient cooling, more uniform temperatures in the ore pellet bed and the least possible corrosion difficulties.
  • This invention relates to a burning device with movable grid connected to a chain system to burn ore pellets or the like, which device comprises in series at least one drying zone, one burning zone and two cooling zones, and means for supplying water in the second cooling zone.
  • the cooling air is fed over the entire length of the cooling zones from below to above through the bed of material to be cooled, there remains a temperature gradient over the total length of these zones in the material to be cooled. If the requirement is made to this material that, when leaving the cooling zone, it should have a certain temperature, a considerable part of. this material will be very much colder than this required temperature and this is not necessary and not desired.
  • the invention consists in that in the known burning machine as indicated above the first cooling zone is at the discharge side, above the moving grid, connected by passages to the burning zone and the drying zone, and that the second cooling zone is passed by the cooling fluid in a downward direction with the aid of a suction fan connected to a flue gas stack of the burning machine.
  • the bed with the material to be cooled will be cooled in the cooling zones from different sides, so that the temperature distribution in this material after cooling will be more uniform. If cooling takes place to a same maximum temperature of the material, the average temperature of this material can thereby become higher, which entrains the possibility to shorten the cooling zones.
  • the beginning of the water cooling should preferably be chosen in a zone where the hottest ore pellets have been cooled down to a temperature of 300 350C. If optimum cooling results are desired, the water cooling should neither begin in a zone where the temperature of the ore pellets is much lower, and it is neither effective to make the water cooling so intense that the temperature of the hottest ore pellets will finally drop below 100C.
  • the distributing system as to quantity and distribution of the water is made adjustable. This adjustability appears to be quite suited for automation if according to the invention the adjustable distributing system is governed by control means depending on the temperature of the burned material at the beginning and the end of the cooling water distributing system. As this temperature at the beginning is higher, the point where the water cooling begins should be displaced more backwardly, and as the said final temperature is higher, the total quantity of cooling water should be increased.
  • the stack losses of the burning machine can be restricted to a minimum if the quantity of cooling air passing through the first cooling zone is adapted to the required quantity of combustion air in the burning zone and to the desired drying capacity of this heated cooling air in the drying zone.
  • the real situation may deviate from the nominal situation for which the plant has been designed.
  • each of said inlet-and outlet passages having an adjustable passage area. It is, e.g., possible for the inlet duct to suck additional cold air from the environment if the desired quantity of drying fluid is too low in volume or it too hot.
  • the exhaust passage may be connected to the flue gas stack and may be used to discharge a surplus of hot air if the quantity of drying medium is too high.
  • FIG. 1 shows diagrammatically a possible and pre ferred embodiment of the burning machine according to the invention.
  • FIG. 2 shows a detail from FIG. 1 on an enlarged scale.
  • FIG. 3 shows the course of temperature through an ore pellet bed.
  • reference numeral 1 shows a chain structure composed of grid cars, conveyed over two sprocket wheels 2 and 3 and moving in the direction of the arrow.
  • This chain therewith passes in subsequence through a first drying zone 4, a second drying zone 5, a burning zone 6, a first cooling zone 7 and a second cooling zone 8.
  • hoods are shown around the cooling zones for guiding gaseous fluids to and from the grid structure.
  • a blowing fan 10 for the supply of air to cooling zone 7 and a suction fan 11 for sucking away cooling air from cooling zone 8 through duct 18 to pump it to stack 9, and a system of boosting fans 12 for sucking away combustion gases from the burning zone 6 and for the displacing thereof to the drying zone 4, a suction fan 13 for sucking away these combustion gases from drying zone 4 to stack 9, a boosting fan 14 for sucking heated cooling air from cooling zone 7 and displacing this air through passage 19 to the second drying zone 5, and exhaust fan 15 for sucking away the drying air which has passed the drying zone 5, and, if desired, for also sucking combustion gases from part of the burning zone 6 (not shown).
  • a blowing fan 10 for the supply of air to cooling zone 7 and a suction fan 11 for sucking away cooling air from cooling zone 8 through duct 18 to pump it to stack 9
  • a system of boosting fans 12 for sucking away combustion gases from the burning zone 6 and for the displacing thereof to the drying zone 4
  • a suction fan 13
  • FIG. 1 a number of burners 16 is shown which maintain within the burning zone 6 a gas temperature of about 1,320C.
  • water spray nozzles 17 are provided, adapted to spray water onto the burned mass over the entire length of this zone. It is clear from FIG. 1 that the cooling fluid in cooling zones 7 and 8 is guided in opposite directions through the layer of burned ore pellets. Moreover, in cooling zone 8 the water sprayed onto the layer and the vapour or steam therefrom is sucked through the layer of material to be cooled.
  • the several zones have lengths which have the following values in proportion to the length of the burning zone 6 percent):
  • first drying zone 4 32 percent second drying zone 5: 35 percent first cooling zone 7: 58 percent second cooling zone 8: 27 percent.
  • the second drying zone 5 there are also burners of the same type as in the burning zone 6, which if necessary can serve to increase further the temperature of the drying fluid.
  • FIG. 2 the second cooling zone 8 is shown on an enlarged scale, but also diagrammatically.
  • a number of water spray nozzles 17 is provided, fed from a central water supply, but each connected to this central water supply 26 through supply ducts 27.
  • a control valve 28 In each of the supply ducts 27 there is a control valve 28.
  • five nozzles 17 have been shown, but it will be clear that this number may be altered at will.
  • Each control valve 28 is connected through an energizing line 29 to a control device 30, adapted to move each one of the valves 28 independently into each position between full open and full closed.
  • Governor R controls the position of the valves 28 in such a way that water is first sprayed in a zone where the temperature of the ore pellets has a certain desired value, the total quantity of water being adjusted by the control device 30 depending upon a second desired temperature of the ore pellets at the end of the cooling zone 8.
  • the control device 30 receives signals from temperature sensors 31 and 32 positioned in the zone where in normal operation water is first sprayed onto the pellets and at the end of the coding zone 8 respectively.
  • FIG. 3 several curves have been shown for explanining the effect of the invention.
  • the thickness of the ore pellet bed on the belt system 1 is indicated, and horizontally the temperature of the ore pellets is given.
  • Four lines have been given in PK]. 3.
  • Line a gives the temperature course in the ore pellet bed where belt 1 enters the cooling zone 8. It appears therefrom that the lower ore pellets have taken up about the temperature of the cold cooling air, whereas the upper ore pellets in the bed still have a temperature of about 550C.
  • Line b gives the temperature course over the height of the bed in the zone of the end of the cooling zone 8 if only fan 11 sucks cooling air from top to bottom through the layer without any water being sprayed.
  • curve c has a convex shape instead of a concave shape as curve d, the temperature of the hottest ore pellets is lowered to below 100C, so that these ore pellets can better be moistened and kept moist a little.
  • a burner device for the baking of ore pellets and the like comprising in sequence, one after the other, at least one drying zone, a burning zone, a first cooling zone, a second cooling zone, a movable grid system for supporting a bed of ore pellets to be baked passing through each of said zones in a longitudinal path, said first cooling zone being connected at one end to said burning zone and drying zone by a passageway extending over said movable grid system, the opposite end of said first cooling zone having means to draw cooling air thereinto for passage upwardly through said movable grid system, said second cooling zone having water distributing means at its upper end thereof for supplying cooling water for passage downwardly through said movable grid system, the opposite end of said second cooling zone having means for carrying off said cooling water after passage through the grid system, said water distributing means being positioned above said movable grid system from a point at a distance of about 15 to 30 percent of the length of said second cooling zone from the entrance end thereof up to close to the exit end thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US308559A 1971-11-24 1972-11-21 Burning device for burning ore pellets and similar bodies Expired - Lifetime US3871631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2158317A DE2158317C3 (de) 1971-11-24 1971-11-24 Bandpelletisieranlage

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US3871631A true US3871631A (en) 1975-03-18

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947001A (en) * 1975-01-13 1976-03-30 Dravo Corporation Combustion system
US3973762A (en) * 1974-05-17 1976-08-10 Dravo Corporation Sintering process and apparatus
FR2444720A1 (fr) * 1978-12-22 1980-07-18 Delattre Levivier Procede d'utilisation des gaz aspires dans une installation d'agglomeration de minerais et installation d'agglomeration perfectionnee
US4221559A (en) * 1978-03-24 1980-09-09 Voest-Alpine Aktiengesellschaft Process and apparatus for firing pellets
US20110143291A1 (en) * 2009-12-11 2011-06-16 Clements Bruce Flue gas recirculation method and system for combustion systems
WO2012038602A1 (en) 2010-09-24 2012-03-29 Outotec Oyj Method for the continuous sintering of mineral material and sintering equipment
CN104032126A (zh) * 2014-04-30 2014-09-10 中南大学 一种移动床焙烧低品位钼精矿的工艺

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2756082C2 (de) 1977-12-16 1982-05-19 Metallgesellschaft Ag, 6000 Frankfurt Sinteranlage zum Sintern von feinkörnigen Eisenerzen
FR2474528A1 (fr) * 1980-01-28 1981-07-31 Delattre Levivier Procede et dispositif de preparation d'un melange mineral dans une installation d'agglomeration
DE102008007297A1 (de) * 2008-02-02 2009-08-06 Aktiengesellschaft der Dillinger Hüttenwerke Verfahren und Vorrichtung zur Kühlung von gesintertem Eisenerz
LU103143B1 (de) * 2023-06-06 2024-12-06 thyssenkrupp Polysius GmbH Materialkühler
WO2024251708A1 (de) 2023-06-06 2024-12-12 thyssenkrupp Polysius GmbH Materialkühler

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1083252A (en) * 1913-06-27 1913-12-30 William A Hall Process of desulfurizing and briqueting ores.
US1181244A (en) * 1915-07-28 1916-05-02 James H Payne Art of agglomerating ores.
US2252714A (en) * 1937-06-29 1941-08-19 Harriet L Hall Process and apparatus for making metal powder
US2498766A (en) * 1948-01-15 1950-02-28 Carnegie Illinois Steel Corp Method for controlling dust in sintering operations
US2672412A (en) * 1949-07-18 1954-03-16 Broken Hill Ass Smelter Continuous oxidizing operations
US2851042A (en) * 1955-10-11 1958-09-09 British Thomson Houston Co Ltd Cooling equipment
US3005699A (en) * 1957-10-09 1961-10-24 Cleveland Cliffs Iron Co Method for converting iron oxide to magnetic oxide
US3244507A (en) * 1964-06-10 1966-04-05 Reserve Mining Co Method of indurating ore particles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1083252A (en) * 1913-06-27 1913-12-30 William A Hall Process of desulfurizing and briqueting ores.
US1181244A (en) * 1915-07-28 1916-05-02 James H Payne Art of agglomerating ores.
US2252714A (en) * 1937-06-29 1941-08-19 Harriet L Hall Process and apparatus for making metal powder
US2498766A (en) * 1948-01-15 1950-02-28 Carnegie Illinois Steel Corp Method for controlling dust in sintering operations
US2672412A (en) * 1949-07-18 1954-03-16 Broken Hill Ass Smelter Continuous oxidizing operations
US2851042A (en) * 1955-10-11 1958-09-09 British Thomson Houston Co Ltd Cooling equipment
US3005699A (en) * 1957-10-09 1961-10-24 Cleveland Cliffs Iron Co Method for converting iron oxide to magnetic oxide
US3244507A (en) * 1964-06-10 1966-04-05 Reserve Mining Co Method of indurating ore particles

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973762A (en) * 1974-05-17 1976-08-10 Dravo Corporation Sintering process and apparatus
US3947001A (en) * 1975-01-13 1976-03-30 Dravo Corporation Combustion system
US4221559A (en) * 1978-03-24 1980-09-09 Voest-Alpine Aktiengesellschaft Process and apparatus for firing pellets
FR2444720A1 (fr) * 1978-12-22 1980-07-18 Delattre Levivier Procede d'utilisation des gaz aspires dans une installation d'agglomeration de minerais et installation d'agglomeration perfectionnee
US20110143291A1 (en) * 2009-12-11 2011-06-16 Clements Bruce Flue gas recirculation method and system for combustion systems
WO2012038602A1 (en) 2010-09-24 2012-03-29 Outotec Oyj Method for the continuous sintering of mineral material and sintering equipment
CN103109148A (zh) * 2010-09-24 2013-05-15 奥图泰有限公司 矿物材料连续烧结方法和烧结设备
EP2619517A4 (de) * 2010-09-24 2014-04-09 Outotec Oyj Verfahren zur kontinuierlichen sinterung eines mineralischen materials und sinterungsvorrichtung dafür
CN103109148B (zh) * 2010-09-24 2015-08-26 奥图泰有限公司 矿物材料连续烧结方法和烧结设备
US9534844B2 (en) 2010-09-24 2017-01-03 Outotec Oy Method for the continuous sintering of mineral material and sintering equipment
CN104032126A (zh) * 2014-04-30 2014-09-10 中南大学 一种移动床焙烧低品位钼精矿的工艺

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Publication number Publication date
DE2158317C3 (de) 1975-08-14
DE2158317A1 (de) 1973-06-07
DE2158317B2 (de) 1975-01-02

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