US3695466A - Charging apparatus for the furnace - Google Patents

Charging apparatus for the furnace Download PDF

Info

Publication number
US3695466A
US3695466A US35775A US3695466DA US3695466A US 3695466 A US3695466 A US 3695466A US 35775 A US35775 A US 35775A US 3695466D A US3695466D A US 3695466DA US 3695466 A US3695466 A US 3695466A
Authority
US
United States
Prior art keywords
bell
hopper
furnace
small
raw materials
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US35775A
Other languages
English (en)
Inventor
Tsunenori Sugawara
Teiji Shibuya
Satoru Miyakado
Jiro Mase
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP4244869U external-priority patent/JPS4825365Y1/ja
Priority claimed from JP3558969A external-priority patent/JPS4815761B1/ja
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Application granted granted Critical
Publication of US3695466A publication Critical patent/US3695466A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements

Definitions

  • furnaces have been devised, e.g., with a double small bell which is used to provide uniform chargings of material, or as disclosed in the Japanese Patent Publication No. 13,121/66 the rotating hopper which charges the raw materials on the small bell is eliminated, and the rotating chute is built in the bell hopper which is a fixed closed vessel and thisrotating chute is rotated by means of an outside driving device, also a gas seal valve is arranged between the opening through which the material descends and the raw material receiving hopper so that the gases are perfectly sealed for the simple apparatus, and thus those furnaces maintain the pressure at the top of the furnace as well as the gas pressure in the furnace in those ways to provide the desired high top pressure operation.
  • the furnace has been so large such as 2,000 to 3,000m or more in the furnace volume, and 7,000mm or more in the large bell diameter, and ZKg/Cm or more in thehigh top operation, and it is difficult to provide satisfying results on account of gas tightness, segregations of the charged materials or abrasions of members in the top charging apparatus.
  • the charging raw material is widely spread due to the large size of the lower bell not to avoid segregations in its dispersion, especially remarkable in the case of small particle materials such as in lime, manganese or other.
  • the present invention has succeeded in providing an apparatus for charging raw materials into the furnace to really meet the above mentioned large scaled furnace operation through detailed examinations and investigations in view of such actual circumstances.
  • the basic object of the invention is to permit the smooth charging of the raw materials while maintaining a suitable pressure at the top of the large furnace. It is not always easy to charge the raw materials smoothly while well maintaining the pressure i.e., in order to maintain the pressure the top of the furnace must be sealed. As above described, it has been the practice to provide the bells in steps at the charging open, and at the time of charging the raw materials from one of the bells, the rests of them are closed to provide a seal, and such operations are alternately repeated or the systems are used which adopt the special rotating hoppers. However, even according to those systems, desireable results are not obtained in said large scaled and high pressured furnaces.
  • the furnace gas inavoidably blows out at the opening and closing of each of the bells, besides considerable amounts of powder dusts (e.g., more than 20g/Nm floats in this furnace gas so that the sealing parts between the bells and hoppers is always worn by said leaking gases to increase the gas leakage which followed by abrasion, prevents maintaining the pressure at the top of the furnace.
  • powder dusts e.g., more than 20g/Nm
  • the invention uses a four bell system so as to prevent those problems, and maintains the pressure at the top of the furnace as well as securing the raw material charging, and further each of the bells takes partial charge of distributing the raw materials and work as a seal.
  • each of the bells and each of the hoppers respectively provide for supplying, distributing or sealings, i.e., the bells and the hoppers for the raw materials accomplish usefully and suitably those objectives and the bells and hoppers for sealing also function without interferences thereby exactly provide for the maintaining of the pressure and charging and distributing the raw materials for a long period.
  • Another object lies in obtaining a charging apparatus for uniform as well as efficient operation. Therefore the invention uses a rotating hopper bell for the uppermost bell or the charging means in order to provide for the uniform distribution of the raw materials from the beginning of the charge at the top of the furnace.
  • a rotating hopper bell is designed only for charging to thereby cancel the technical difficulties of rotating this part as well as serving the seal as in the prior art to accomplish the destined charging with a simple composition.
  • the rotating hopper bell only for charging can accomplish its required work so that the raw materials are fed to said rotating hopper through a continuous belt conveyor, and special means are no longer required such as adopt the intermittent skip to singly supply the raw materials thereonto or intermittently drive the belt conveyer to prevent the raw materials from falling between the hopper and the bell. Besides it is possible to continuously and efficiently charge the raw materials with the belt conveyor thus more improve the large scaled furnace operation.
  • the invention provides a charging apparatus of a comparatively lower figure.
  • the four bells are arranged at the top of the furnace, which will avoid the larger and higher figure.
  • the higher furnace requires more structural materials and costs for the furnace construction, being further followed by the large conveying equipment, driving means or other bringing the largeness all over the furnace.
  • the bell having only said scaling function it is not essential to form a hopper which stores the raw material but possible to remove this hopper at least in one part. Therefore in spite of the four bell system the height of the top furnace does not increase so much, and the construction cost is economical.
  • FIG. 1 is a cross-sectional view showing the whole charging apparatus
  • FIG. 2 is an enlarged cross-sectional view of the bell parts
  • FIG. 2A is a further enlarged cross-sectional view of a detail
  • FIG. 3 is an enlarged cross-sectional view of the rotating hopper parts
  • FIG. 1 shows one of the useful embodiments that is, the invention adopts at the top part of the furnace 10, the four bell system of the large bell 1, middle bell 2, small bell 3 and rotating hopper bell 4. Among them the large bell 1 and the rotating hopper bell 4 are formed for charging the raw materials, and the middle bell 2 and the small bell 3 between them are devised to serve for gas sealing.
  • the invention is to separately perform the functions of the large bell and small bell in the above said McKee system, i.e., the charging function as well as the gas sealing function by means of independent bells, thereby eliminating the faults due to one bell which operates the charging and sealing functions as in the conventional apparatus, and securing a perfect charging and sealing operation.
  • the furnace is provided'at its open top with a large bell hopper 1a to which a central rod 11 is connected, i.e., said large bell hopper 1 is provided for oblique adjustment with a ball seat 15 at the end of the central rod 11 which is vertically moved by a large bell lever 7 arranged on a top deck 16 at the uppermost rotating hopper 5.
  • Said large bell hopper 1a is furnished on its top with a ring wall 10 with a middle bell hopper 2a to which the middle bell 2 is arranged, and this middle bell 2 is opened and closed by a middle bell lever 6 opposite to said large bell operating lever 7.
  • the upper end of the middle bell adjusting pipe 12 concentric with said central rod 11, is connected to the lower ends of rods 6b, 6b depending from an arm 6a of the middle bell lever 6, and the middle bell 2 is attached on the lower portion of said middle bell adjusting pipe 12.
  • the middle bell hopper 2a is equipped with a ring on its upper portion supporting a small bell hopper 3a therein for the small bell 3, and this small bell 3 is vertically operated by its attachment to pipe 13 operated by a driving unit 8 as a trunnion cylinder, on a middle deck 17 positioned below the lower part of the top deck 16 having the operating levers 6, 7.
  • the small bell hopper 3a is provided at its upper end with said rotating hopper 5, at the lower open end of which is arranged the rotating hopper bell 4.
  • Said rotating hopper 5 is supported on the deck 20 together with the driving gear 18, and this rotating hopper bell 4 is vertically moved through the rod 14 by means of another gear 9 which is crossed with said driving unit 8 on the middle deck 17.
  • a chute 50 as shown in FIG. 3 faces said rotating hopper 5 into which the raw materials are supplied.
  • a sounding means 19 is provided on the said lower deck 20.
  • raw material chambers 101, 102 between the large bell 1 and middle bell 2 and between the middle bell 2 and small bell 3 respectively but such chambers are not provided between said small bell 3 and the rotating hopper bell 4, and they are provided near each other.
  • the part between the small bell hopper 3a and the rotating hopper 5 is relieved for the atmospheric air as the cases may be, and therefore the top of the little bell 3 is made readily for the atmospheric pressure.
  • 21 is a waste gas duct.
  • FIG. 2 shows the enlarged bell parts.
  • Said large bell 1 has on its upper side a protective shroud 1d to prevent abrasions owing to various falling materials.
  • the lower periphery of this large bell 1 is opposite to a flaring section 1b at the lower part of the large bell hopper 1a in order to seal the gases.
  • this large bell 1 and flaring section 1b are designed mainly for distributing the raw materials and these parts are adjacent to the high temperatured furnace so that they adopt the cast metals such as the heat resisting steel of enough thickness as well as abrasion resistibility.
  • the middle bell 2 on the large bell 1 is designed for the sealing function, and accordingly the middle bell hopper 2a has fixed on its lower end a ring shaped flaring body 22 of C shape in cross section, and the flaring body 22 is fixed at its lower end with a ring shaped packing material 23 of heat resisting rubber with fitting plate 26.
  • This ring shaped packing material 23 is appropriately expanded out from the inner slanting side of said flaring body 22 and accordingly when the middle bell 2 is raised up as shown, the sealing relationship is formed automatically between this packing material 23 and the lower periphery of the middle bell 2.
  • the protecting pipe 24 is arranged with a trumpet shape to cover the upper end of the middle bell 2 and its sheltering ring 25 covers the middle bell adjusting pipe 12 within the necessary extent at this upper part of this sheltering pipe 24 so as to avoid damages thereto by various falling materials.
  • the small bell 3 is also devised for the sealing function, and the small bell hopper 3a is at its lower end fixed with a flaring body 32 of C shape in cross section similar to body 22 of the middle bell, and the packing material 33 is fixed with a fitting plate 36 at the lower end of the flaring body 32.
  • this small bell 3 is, apparantly from the shown state, always covered with the rotating hopper bell 4, its upper part is only furnished with a simple cover 34 and does not require a sheltering pipe or ring as in the middle bell 2.
  • the rotating hopper 5 for the rotating hopper bell 4 is supported on the lower deck 20, and further as shown in FIG. 2 a space 38 is provided in relation to the hopper member 37 on the small bell hopper 3a to contact the atmospheric air.
  • Said lower deck 20 is provided with a driving motor 18, and a gear 46 driven by this motor 18 engages with a ring shaped gear 47 which is provided outside of supports the rotating hopper 5 and which is supported on a roller 48 mounted on the lower deck 20, and the rotating hopper 5 is driven by driving said motor 18.
  • the protecting pipe 14 and ring 42 are provided in steps on the upper rotating hopper bell 4.
  • the raw materials are supplied into said rotating hopper 5 by means of a chute 50 fixed on the middle deck 17, into which the raw materials are continuously fed through the belt conveyer 51, and the lower part of the chute 50 has open end branches extending to both sides of the operating pipe 14, see FIG. 1.
  • These branched openings 54 are respectively equipped with dampers 55 to be temporarily closed.
  • a suitable protecting member 52 is furnished on the inner side of this chute 50 to prevent it from shocks caused by charging of the various materials.
  • the large bell 1 among the bells is the largest, and in order to suspend it said ball seat 15 is adopted to provide an appropriate contact of bell 1 in relation to the flaring body lb.
  • the rotating hopper 5 when the rotating hopper 5 is moving the predetermined raw materials are supplied into the rotating hopper 5, and when the inner chamber 102 on the middle bell 2is made in the condition of the atmospheric pressure, the small bell 3 is opened, and subsequently when the inner chamber 102 on the middle bell 2 is made in the condition of the atmospheric pressure the rotating hopper bell 4 is opened, the raw materials in the rotating hopper 5 is laid on the middle bell 2, and in this manner after the raw materials are moved to the middle bell 2, the small bell 3 is first closed and the rotating hopper bell 4 is closed. In this case the small bell 3 and the rotating hopper bell 4 may be simultaneously opened and closed.
  • the self-cleaning effects by the falling raw materials are exactly provided and the raw materials or powder dusts do not adhere to the sealing part at all and therefore gas blowing is unnecessary for cleansing the powder dusts.
  • the gas tightness of the large bell is not absolute because of its large diameter in view of the heat resistibility or abrasion resistibility, but the middle bell 2 and the small bell 3 both serve for sealing the gas in two steps to obtain the perfect gas sealing and exactly maintain the high top pressure.
  • the sealing part of the small bell 3 is not exposed at any time to the top furnace gas of high temperature and high pressure it is possible to obtain a good sealing function in which material such as rubber is used.
  • the rotating hopper and the rotating hopper bell can be operated in the atmospheric pressure without trouble concerning the seal on such rotating parts as well as wear of the member contacting the furnace gases of high temperature and high pressure which bear powder dusts, but with easy maintenance and observations.
  • a high rotating chute is not adopted, and the rotating hopper bell and the little bell are positioned near each other to reduce the height.
  • the rotating hopper and the small bell are re lieved under the atmospheric pressure condition to greatly reduce the capacity exposed in the furnace gas atmospheric of high temperature and high pressure. The operation is 'easy and smooth with a large amount and high pressure system.
  • a charging method for a furnace consisting in arranging at the top of the furnace, in the order from the furnace side, hoppers, a large bell, middle bell, small bell and rotating hopper bell positioned in relation to the respective hoppers therefor, uniformly distributing the raw materials to lay onto the small bell, feeding from this small bell to the large bell through the middle bell, and thereafter opening said large bell to charge the raw materials into the furnace.
  • a charging method for a furnace including rotating said rotating hopper continuously, feeding the raw materials by means of a belt conveyer, opening the small bell and subsequently opening the rotating hopper bell, supplying the uniformly distributed raw materials onto the middle bell, after closing the rotating hopper bell and the small bell, opening the middle bell to feed the raw materials onto the large bell, and in this manner opening the large bell to charge the raw materials into the furnace under the condition that at least the middle bell is closed, preferably the middle bell as well as the small bell are closed.
  • a charging method for a furnace including opening the closing of the rotating hopper bell under atmospheric pressure.
  • a charging method for a furnace including adopting the seal means which utilize packing materials on the respective hoppers for the middle bell and the small bell, and charging the raw materials while maintaining enough air-tightness in any of these bell hoppers.
  • a charging method for a furnace, as described in claim 1 including under such a condition that one of the middle bell or small bell is closed, opening the remainder of said bells in order to supply the raw materials when either said middle bell or small bell is closed.
  • a charging method for a furnace including closing at least one of said middle bell or small bell and at least one of said large bell or rotating hopper bell, and opening the other bells.
  • a charging apparatus for a furnace comprising fixed hoppers, a large bell, middle size bell, small bell, said bells being mounted with said middle size bell above said large bell and said small bell above said middle size bell and said large bell above the top of a furnace, each of said hoppers being positioned with a different one of said bells capable of opening and closing its respective hopper, a rotatable hopper bell mounted above said small bell, means for vertically moving each of said bells independently relative to its hopper and a driven rotatable hopper mounted over said upper rotatable hopper bell.
  • each of said hoppers relative to the middle bell and the small bell is respectively provided at its lower portion with a flaring part of C shape in cross section, and ring shaped packing material is appropriately expanded out from the inner slant side of said flaring body.
  • a charging apparatus as described in claim 7 including a chute arranged at said rotating hopper, and a belt conveyer for feeding raw materials to said chute.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
US35775A 1969-05-09 1970-05-08 Charging apparatus for the furnace Expired - Lifetime US3695466A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP3558869 1969-05-09
JP3558769 1969-05-09
JP4244869U JPS4825365Y1 (de) 1969-05-09 1969-05-09
JP3558969A JPS4815761B1 (de) 1969-05-09 1969-05-09

Publications (1)

Publication Number Publication Date
US3695466A true US3695466A (en) 1972-10-03

Family

ID=27460117

Family Applications (1)

Application Number Title Priority Date Filing Date
US35775A Expired - Lifetime US3695466A (en) 1969-05-09 1970-05-08 Charging apparatus for the furnace

Country Status (3)

Country Link
US (1) US3695466A (de)
DE (1) DE2022909B2 (de)
GB (1) GB1245209A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4878655A (en) * 1986-09-26 1989-11-07 Man Gutehoffnungshuette, Gmbh Furnace charging throat construction
US5494263A (en) * 1994-03-07 1996-02-27 Centro De Investigacion Y Asistencia Tecnica Del Edo. De Qro, A.C. System for solid material charging into vertical reactors by electronic control of the exhaust gases
CN102605197A (zh) * 2012-04-11 2012-07-25 锡矿山闪星锑业有限责任公司 一种锑冶炼挥发熔炼鼓风炉炉顶进料装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8907606U1 (de) * 1989-06-21 1990-10-18 Feodor Burgmann Dichtungswerke Gmbh & Co, 8190 Wolfratshausen Ringdichtung für den Kugelkörper eines im Zylinderkopf eines Verbrennungsmotors gelagerten Kugeldrehschiebers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516190A (en) * 1945-04-07 1950-07-25 Bethlehem Steel Corp Apparatus for charging blast furnaces
US3221906A (en) * 1964-02-11 1965-12-07 Norwood B Melcher Sealing system for blast furnace bells for high pressure top operation
US3297432A (en) * 1963-12-26 1967-01-10 Mohr & Sons John Blast furnace charging apparatus pressurization

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516190A (en) * 1945-04-07 1950-07-25 Bethlehem Steel Corp Apparatus for charging blast furnaces
US3297432A (en) * 1963-12-26 1967-01-10 Mohr & Sons John Blast furnace charging apparatus pressurization
US3221906A (en) * 1964-02-11 1965-12-07 Norwood B Melcher Sealing system for blast furnace bells for high pressure top operation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4878655A (en) * 1986-09-26 1989-11-07 Man Gutehoffnungshuette, Gmbh Furnace charging throat construction
US5494263A (en) * 1994-03-07 1996-02-27 Centro De Investigacion Y Asistencia Tecnica Del Edo. De Qro, A.C. System for solid material charging into vertical reactors by electronic control of the exhaust gases
CN102605197A (zh) * 2012-04-11 2012-07-25 锡矿山闪星锑业有限责任公司 一种锑冶炼挥发熔炼鼓风炉炉顶进料装置
CN102605197B (zh) * 2012-04-11 2014-02-12 锡矿山闪星锑业有限责任公司 一种锑冶炼挥发熔炼鼓风炉炉顶进料装置

Also Published As

Publication number Publication date
DE2022909A1 (de) 1971-02-25
GB1245209A (en) 1971-09-08
DE2022909B2 (de) 1976-02-05

Similar Documents

Publication Publication Date Title
US3693812A (en) Furnace charging apparatus
US3921831A (en) Device for distributing raw materials into blast furnace
US3899088A (en) Furnace charging apparatus
US3799367A (en) Discharge system for a shaft-type furnace
US2408945A (en) Blast-furnace charging system
US3695466A (en) Charging apparatus for the furnace
US4162784A (en) Pressure equalization apparatus and method
US3706387A (en) Blast furnace charging apparatus for high top pressure
US2516190A (en) Apparatus for charging blast furnaces
US3302805A (en) Materials distributor of a blast furnace
US3198623A (en) Gas sealing and continuous charging method for blast furnace
US3482714A (en) Furnace top charging equipment
US3955693A (en) Method and apparatus for cooling and cleaning the sealing surface of a valve
US3780890A (en) Furnace charging apparatus
US4881869A (en) Furnace charging throat construction
US3972426A (en) Device for charging materials into blast furnace
US4116345A (en) Charging apparatus for shaft furnaces and method
US3704992A (en) Charging apparatus construction for a blast furnace
US3206254A (en) Material handling apparatus
US3764027A (en) Blast furnace high top pressure charging system
US3796419A (en) Charging apparatus for shaft furnaces
US2580700A (en) Furnace discharge apparatus
US3554393A (en) Charging device for a furnace
US3533522A (en) Furnace top distributor for shaft furnace,particularly for blast furnaces
US4026427A (en) Charging apparatus for receptacles