US3064962A - Furnace divider plates - Google Patents

Furnace divider plates Download PDF

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Publication number
US3064962A
US3064962A US36418A US3641860A US3064962A US 3064962 A US3064962 A US 3064962A US 36418 A US36418 A US 36418A US 3641860 A US3641860 A US 3641860A US 3064962 A US3064962 A US 3064962A
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Prior art keywords
divider plate
furnace
divider
segments
plates
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Expired - Lifetime
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US36418A
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English (en)
Inventor
Frank J Boron
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.)
American Brake Shoe Co
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American Brake Shoe Co
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Publication date
Application filed by American Brake Shoe Co filed Critical American Brake Shoe Co
Priority to US36418A priority Critical patent/US3064962A/en
Priority to GB11981/61A priority patent/GB935564A/en
Priority to DEA37265A priority patent/DE1137221B/de
Application granted granted Critical
Publication of US3064962A publication Critical patent/US3064962A/en
Anticipated expiration legal-status Critical
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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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/08—Shaft or like vertical or substantially vertical furnaces heated otherwise than by solid fuel mixed with charge
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types

Definitions

  • This invention relates to divider plates for an orcprocessing furnace of the kind used to sinter and consolidate finely divided ore material or other metal-containing material such as finely divided iron ore or the like.
  • segmented construction may take the form of a plurality of depend- 3,%4,9ti2 Patented Nov. 20, 1962 ing links connected to the upper part of the divider plate by articulated connections, as by hinged joints or the like; and this construction constitutes a specific object of the present invention.
  • the depending links can be arranged in one or more generally horizontally extending and vertically aligned rows, and it is a further object of the present invention to offset the links in immediately adjacent rows to mini mize the packing of the material in the spacings between individual links and consequent mechanical stresses on the links.
  • the upper part of the divider plate includes a sloped upper edge effective to slice through and divide the downwardly dividing material in a manner akin to that of a knife blade.
  • the upper part of the divider plate is a solid, onepiece member having a corrugated cross-section of substantially uniform thickness afforded by at least one alternate and generally horizontally disposed rib and groove on the opposite side faces thereof.
  • the upper portion of the divider plate has conduit means formed internally therein for circulating cooling fluid therethrough. Divider plate constructions incorporating the foregoing structural fea tures constitute further objects of the present invention.
  • FIG.1 is a diagrammatic top plan view of a furnace in which the present invention may be embodied
  • FIG. 2 is a sectional view taken substantially along the line indicated by the arrows 2-2 in FIG. 1;
  • FIG. 3 is a side elevation view of a divider plate constructed in accordance with one form of the present invention.
  • FIG. 4 is an end elevation view of the divider plate illustrated in FIG. 3;
  • FIGS. 3A and 4A are respective side elevation and end elevation views of another construction for atop portion of a divider plate
  • FIG. 5 is a side elevation view of a divider plate constructed in accordance with another form of the present invention.
  • FIG. 6 is an end elevation view of the divider plate illustrated in FIG. 5
  • FIG. 7 is a section View taken substantially along the line indicated by the arrows 7-7 in FIG. 10;
  • FIG. 8 is a sectional View taken substantially along the line indicated by the' arrows 6-3 in FIG. 10;
  • FIG. 9 is a sectional view taken substantially along the line indicated by the arrows 9-9 in FIG. 10;
  • FIG. 10 is a side elevation view of another form of a divider plate constructed in accordance with the present invention.
  • FIG. 11 is an end elevation view taken in the direction of the arrows 11-11 in FIG. 10;
  • FIG. 12 is a fragmentary view taken. in the direction of the arrows 12-12 in FIG. 10;
  • FIG. 13 is a fragmentary end elevation view taken in the direction of the arrows 13-13 in FIG. 10;
  • FIG. 14 is a sectional view taken substantially along the line indicated by the arrows 14-14 in FIG. 10.
  • FIGS. 1 and 2 there is shown diagrammatically a furnace PR of the kind with which the present invention is concerned.
  • the furnace PR is constructed of refractory brick and includes vertical side walls and 11, vertical end walls 12 and i3, and a bottom wall 14.
  • the bottom wall 14- is provided with an opening 16 of the usual kind through which a blast of hot air is introduced into the furnace from tuyeres to produce the heat in the furnace cavity.
  • the finely divided ore material that is to be exposed to the heat is introduced at the top of the furnace, and under the present invention the side walls lit and 11 at the upper portions thereof are provided with a plurality of inwardly directed divider plates 21 which maintain the top of the bed B of the material undergoing heat treatment in a continuous collapsed, that is, loose condition so that any tendency for the material to coalesce or fuse into a cake or crust is prevented.
  • the divider plates 24 in the present instance are produced as castings, and because of the high temperatures encountered these castings consist of a heat-resistant alloy. 1 have found that a highly alloyed steel containing 24 percent chromium, 12 percent nickel, 0.30 percent carbon, and the remainder essentially iron gives highly satisfactory performance. This alloy is extremely strong and ductile, consistent with the mechanical and thermal stressconditions encountered in a furnace as FR. Chromiurn may vary from '20 to percent; nickel from 10 to 20 percent; carbon from 0.20 to 0.46 percent; remainder substantially iron.
  • the upper side edges of the furnace FR are bevelled.
  • the plates 20 are adapted to be secured to these bevelled faces of the furnace PR, and to this end are formed with hanger brackets 21 adapted to receive fastening bolts 248.
  • the bolts 24B serve to anchor the plates 20 securely in place with the plates extending inwardly of the side walls of the furnace, that is, in normal relation compared to the side walls of the furnace.
  • the divider plates indicated generally at 20 in FIG. 2 may be of any of the specific forms to be described in detail hereinafter.
  • the thermal stresses to which the plates 20 are subjected are rather severe, especially when it is considered that the heat near the lower edges of the plates 20 may exceed 2000 F. under certain conditions, and under these same conditions the temperature at the top of the material bed just above the upper edge of the plates may be less than 500 F.
  • FIG. 2 the variations in the temperatures in various parts of the material in process are diagrammatically indicated in a very general manner by isotherms 1-1 and L4 in which the higher numbers indicate higher temperatures. It will therefore be seen that the temperature differential between the upper and lower edges of the plates 20 is quite large, and such severe temperature conditions have resulted in short life of furnace divider plates. Thus, the large temperature differentials existing between the upper and lower parts of each divider plate cause these parts to expand different amounts and develop internal stresses within the divider plates, which stresses are directly proportional to the temperature differential existing therein.
  • a divider plate includes a lower portion having a segmented construction in which individual segments are separated from one another and are permitted relative movement therebetween.
  • this segmented construction minimizes the transfer of thermally induced stresses, both between the individual segments and the upper part of the divider plate.
  • FIGS. 3 and 4 One form of a divider plate thus constructed in accordance with the present invention is illustrated in FIGS. 3 and 4 and is designated generally by the reference numeral 20A.
  • the divider plate 20A includes an upper part 31 which is of a generally triangular shape in side elevation and which includes a downwardly inclined upper surface or edge 32 for dividing and separating the downwardly moving material in process within the furnace.
  • the upper part 31 presents a relatively narrow profile in plan view when the divider plate NA is oriented in an operative positionwithin the furnace.
  • the upper part 31 is formed with a corrugated cross-section, as best illustrated in the end view of FIG. 4.
  • the upper part of the divider plate has a substantially uniform thickness so that a groove as 33 in one side surface of the divider plate is presented as a rib 34 in the opposite side surface of the divider plate.
  • the corrugations thus defined project substantially normal to the direction of downward movement of the material in process, and, as will be apparent from an inspection of FIG. 2, the ribs and grooves extend generally parallel to the isotherms within the furnace.
  • the purpose of this corrugated configuration of the upper part of the divider plate is to facilitate the differential expansion along the vertical extent of the upper part of the divider plate, which differential expansion is caused by the temperature gradient through this part of the divider plate.
  • a base flange 35 is formed integral with the upper part 31 in a plane generally normal thereto, and is adapted to seat against the inner surface of a side wall of the furnace in the mounted position as illustrated in FIG. 2.
  • the base flange 36 includes an upwardly extending part 3'7 which is adapted to function as a hanger member for fastening the divider plate ZQA to the side wall of a furnace whenever a mounting bolt as 2433 (see FIG. 2) is inserted within a rectangular-shaped slot 38 formed in the hanger member 37.
  • the divider plate 20A illustrated in FIGS. 3 and 4 incorporates a segmented lower construction in which a plurality of individual segments or link members 38A and 33B are separated and slightly spaced from one another so as to be free for thermal expansion and relative movement with respect to one another. Therefore, any thermally induced stresses tending to produce deformation or cracks in any one segment are localized therein and cannot be transferred to any other segment.
  • the lower extremity of the divider plate is discontinuous and comprises isolated elements which confine the thermal stresses.
  • the individual segments or link members 38A and 38B are also attached to the upper part 31 in articulated connections which substantially eliminate any transfer of thermally induced stresses between these segments and the upper part 31 of the divider plate.
  • the individual se ments depend from the upper part 31 in two substantially horizontally extending and vertically aligned rows.
  • the segments 33A are attached by a hinge connection to the upper part of the divider plate while the segments 385 in the lower row are attached by a hinge connection to the lower ends of the segments 38A.
  • each of the segments 38A includes an eyelet 41 interposed between a corresponding pair of hinge knuckles 39.
  • a pin 42 which is preferably a cast member of heat-resistant alloy rather than a forged member, is suitably retained in axial position within the hinged knuckles 39 as by being welded at W to a hinge knuckle 39.
  • Eyelets 43 are formed on the lower ends of the link members 38A and fit between hinge knuckles 44 formed on each of the segments 3813.
  • a pin 46 which is also preferably cast like the pin 42, completes the hinge connection between the link members 38A and 38B and is retained in axial position as by welds W1.
  • each of the segments 38A and 33B is slightly spaced from an adjacent segment, and the eyelets 41 and aoeaeez 43 are permitted some axial movement with respect to the respective hinge knuckles 39 and 44 so that thermal expansion without binding is permitted for all temperature conditions that may occur in the course of operation of the furnace.
  • the upper part 31 of the divider plate 29A functions as a blade member for slicing through and dividing the downwardly moving material, while the articulated and segmented lower portion of the divider plate ZhA forms a downwardly extending continuation of the upper part of the divider plate and is effective to maintain the divided material in a loose, unpacked condition.
  • the divider plate 20A can effectively perform its function even though a part thereof should be damaged or lost.
  • the divider plate 20A can function effectively even though up to three segments as 38A or 383 should be lost in either or both rows.
  • the divider plate ZllA also achieves economy in operation inasmuch as the upper part 31 will generally last longer than the lower portion. Therefore, the divider plate ZilA can be periodically removed from the furnace and the upper pmt 31A fitted with replacement segments as 38A and 3813.
  • FIGS. 3A and 4A there is illustrated a modified and substantially planar upper part of a furnace divider plate which can be utilized when the temperature conditions within the furnace are not so severe as to require a corrugated configuration like that illustrated in FIGS. 3 and 4.
  • the divider plate part illustrated in FIGS. 3A and 4A is like the part 31 incorporated in the divider plate illustrated in FIGS. 3 and 4, and like reference numerals are used to designate like parts but with the addition of the suffix A in FIGS. 3A and 4A.
  • the part 31A has an inclined upper edge 32A and planar side walls 35.
  • the lower edge of the part 31A is formed with a series of hinge knuckles 39A for the attachment of segments like those illustrated in FIGS. 3 and 4.
  • the segments 33B are disposed substantially directly beneath corresponding segments 38A.
  • FIGS. 5 and 6 With the exception of the above-noted olfsetting of the individual segments or link members in one row with respect to those in another row, the divider plate illustrated in F168. 5 and 6 is generally similar to that illustrated in FIGS. 3 and 4, and like reference numerals, but with the addition of the prime mark in FIGS. 5 and 6, are used to designate like parts. Thus, in the construction illustrated in FIGS. 5 and 6 the lower row comprises alternate segments 38C and 38D.
  • Each segment 38C is approximately half again as wide as a related segment 38A in the upper row and is formed with a pair of hinge knuckles 43 which receive an eyelet 43 therebetween.
  • Each segment 381) is approximately the same width as a segment 38A and includes an eyelet 49 which fits between a pair of eyelets 43' and which is aligned with the spacing between the respective segments 38A.
  • the spacings between the segments 38C and 38D are offset from the corresponding spacings between the segments 38A to minimize the tendency of the material in process to become wedged and packed therein, and
  • FIGS. 7-14 A third form of a divider plate constructed in accordance with the present invention is illustrated in FIGS. 7-14 and is designated generally by the numeral 51.
  • the upper part of the divider plate is adapted to have cooling fluid circulated therethrough.
  • the upper part of the divider plate includes peripheral, generally tubular-shaped conduit structure which defines a substantially triangular-shaped upper part, as illustrated in the side elevation view of FIG. 10.
  • the tubular-shaped conduit structure includes avertically disposed leg 53 integrally joined with a hanger member 54 and a base flange 56.
  • the leg 53 joins with a generally horizontally extending leg 57, which in turn merges into leg 58 at the forwardmost end of the divider plate 51 to define a hollow nose portion in that area of the plate.
  • the leg 53 extends upwardly from the forwardmost end of the divider plate to the hanger member 54 and affords an upper inclined surface 59A and 583 effective to slice through and divide the downwardly moving material in process in the same manner as the corresponding surfaces of the other forms of the divider plate of the present invention.
  • a web 61 extends between and joins the legs 53, 57, and 5% but is formed with openings a2 and 63 in the corners defined by the merger of the legs 53 and 57 with the leg 58. These openings 62 and 63 alleviate the build-up of stress concentrations in these areas. if desired, the web 61 can be formed with a similar opening in the corner defined by the juncture of the legs 53 and 57.
  • This part of the divider plate is preferably formed by casting, and as illustrated in the respective FiGS. 7, 8, and 9 and 14, the wall thicknesses of all portions of the upper part of the divider plate, including the web 61, are of substantially uniform thickness to thereby minimize problems of differential thermal expansion.
  • the hanger member 54 is formed with two internal passageways 6i and 62 separated by a Web 63.
  • the passageway 51 constitutes an inlet passageway which communicates with a passageway 64 defined by the hollow interior of the leg 53 (see FIG. 8).
  • the passageway 62 affords an outlet passageway in communication with passageway 66 defined within the leg 58 (see FiG.ll).
  • the leg 57 includes a passageway 67 defined within the hollow interior thereof, and this passageway 67 communicates with the passageway 64 in the le 53 and also with the passageway as and leg 58 through a chamber 68 defined within the hollow interior of the forwardmost part or nose of the divider plate 51 (see FIG. 14).
  • air or other cooling fluid can be introduced through the passageway 61 and circulated throughout the tubular frame of the upper part of the divider plate by means of the conduit structure described above. Thereafter, the cooling fluid is removed from the divider plate through the outlet passageway 62.
  • FIGS. 7-14 enables air lines or the like to be directly attached to the uppermost end of the hanger member 54 so that there is little chance for the connections to be damaged by the material in process.
  • the hanger member 54 is formed with a rectangularshaped slotted opening 71 which is adapted to receive a fastening bolt like the bolts 24B illustrated in FIG. 2.
  • the divider plate illustrated in FIG. 10 only a single row of segments or link members is shown attached to the upper part of the divider plate. However, additional rows could be added by arrangements similar to those illustrated in FIGS. 35, if so desired.
  • the lower edge of the upper part of the divider plate is formed with a series of hinge knuckles 72, and the individual segments 70 are each formed with an eyelet 73 retained in position between the knuckles 72 by a pin 74.
  • the pin 74- is '2 preferably cast and is welded in position by weldment W2.
  • each form of the divider plate of the present invention incorporates a segmented lower portion substantially coplanar with the upper portion and in which the individual segments are spaced from one another to minimize the transfer of thermally induced stresses therebetween. Additionally, each segment is connected to an upper part of the divider plate in an articulated connection and may be readily removed therefrom.
  • the upper part of the divider plate may be formed with a corrugated configuration for facilitating ditierential thermal expansion, or may be adapted to have cooling fluid circulated internally therethrough.
  • a divider plate for an ore-processing furnace of the kind in which the material in process is introduced through the top of the furnace and moves progressively downwardly therethrough during the processing operation said divider plate being adapted to project inwardly from a side wall of the furnace into the material in process in the furnace and comprising an upper blade member having a generally right triangular configuration in side elevation when oriented in an operative position in the furnace, which configuration is defined by a substantially vertically extending rear edge adapted to seat against the side wall of the furnace, an inclined upper edge inclined forwardly and downwardly from the rear edge and eifective to slice through and divide the downwardly moving material, and a substantially horizontally extending lower edge, said divider plate comprising also a lower segmented portion which includes a plurality of individual platelike link members arranged in horizontally extending and vertically aligned rows and depending from the lower edge of the blade member substantially in a front-to-rear row and substantially in the plane of the blade member, and means affording articulated connections between said link members and said blade
  • a divider plate as definedin claim 3 in which a first row of link members is directly connected to the lower edge of the blade member in' a hinge-type joint and a second row of link members is connected to said one row in another hinge-type joint, and in which the link members in the second row are horizontally ofi'set with respect to the link members in the first row.
  • a divider plate for an ore-processing furnace of the kind in which the material in process is introduced through the top of the furnace and moves progressively downwardly therethrough during the processing operation said divider plate being adapted to project inwardly into the material in process in the furnace and comprising an upper portion substantially of solid blade-like construction having a lower extremity and a substantially vertically straight rear edge extremity and formed with an upper surface inclined downwardly from the rear edge for slicing through and dividing the downwardly moving material, and a lower segmented portion substantially in the plane of the upper portion including a plurality of individual one-piece plate-like segments separated from one another in a front-to-rear row and pivotally connected in dividually to the lower extremity of said upper portion for minimizing the transfer of thermally induced stresses between the individual segments.
  • a divider plate for an ore-processing furnace of the kind in which the material in process is introduced through the top of the furnace and moves progressively downwardly therethrough during the processing operation said divider plate comprising an upper member substantially of solid blade-like construction presenting a relatively narrow profile in plan view when oriented in an operative position in the furnace and having a lower extremity and a substantially vertically straight rear edge extremity and formed with an upper surface inclined downwardly from the rear edge for slicing through and dividing the downwardly moving material, a lower segmented portion which includes a plurality of individual plate-like link members depending from and substantially in the plane of the upper member and arranged substantially in a front-to-rear row, and means affording articulated connections between said link members and the lower extremity of said upper member for minimizing the transfer of thermally induced stresses between the individual link members and between the link members and the upper member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US36418A 1960-06-15 1960-06-15 Furnace divider plates Expired - Lifetime US3064962A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US36418A US3064962A (en) 1960-06-15 1960-06-15 Furnace divider plates
GB11981/61A GB935564A (en) 1960-06-15 1961-04-04 Furnace divider plates
DEA37265A DE1137221B (de) 1960-06-15 1961-04-24 Unterteilungsplatte fuer einen Schachtofen zum Trocknen und Sintern von Erzen

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US36418A US3064962A (en) 1960-06-15 1960-06-15 Furnace divider plates

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US3064962A true US3064962A (en) 1962-11-20

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US36418A Expired - Lifetime US3064962A (en) 1960-06-15 1960-06-15 Furnace divider plates

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US (1) US3064962A (US07816562-20101019-C00012.png)
DE (1) DE1137221B (US07816562-20101019-C00012.png)
GB (1) GB935564A (US07816562-20101019-C00012.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9845692B2 (en) 2015-05-05 2017-12-19 General Electric Company Turbine component connection with thermally stress-free fastener

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009871A (en) * 1976-06-22 1977-03-01 Obenchain Richard F Metallurgical furnace

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2710747A (en) * 1952-12-03 1955-06-14 United States Steel Corp Device for protecting blast furnace linings
US2824730A (en) * 1955-10-12 1958-02-25 American Brake Shoe Co Divider plates for furnaces

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029160B (de) * 1955-10-12 1958-04-30 American Brake Shoe Co Unterteilungsplatte fuer Schachtoefen zum Trocknen und Sintern von Erzen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2710747A (en) * 1952-12-03 1955-06-14 United States Steel Corp Device for protecting blast furnace linings
US2824730A (en) * 1955-10-12 1958-02-25 American Brake Shoe Co Divider plates for furnaces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9845692B2 (en) 2015-05-05 2017-12-19 General Electric Company Turbine component connection with thermally stress-free fastener

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GB935564A (en) 1963-08-28
DE1137221B (de) 1962-09-27
DE1137221C2 (US07816562-20101019-C00012.png) 1963-04-11

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