US3713632A - Heat regenerator particulary a hot blast stove for a blast furnace plant - Google Patents

Heat regenerator particulary a hot blast stove for a blast furnace plant Download PDF

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Publication number
US3713632A
US3713632A US00120267A US3713632DA US3713632A US 3713632 A US3713632 A US 3713632A US 00120267 A US00120267 A US 00120267A US 3713632D A US3713632D A US 3713632DA US 3713632 A US3713632 A US 3713632A
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United States
Prior art keywords
dome
stove
columns
masonry structure
heat regenerator
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Expired - Lifetime
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US00120267A
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English (en)
Inventor
A Beenhakker
J Felthuis
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KONINKLYKE NEDERLANDSCHE HOOGOVENS EN STAALFAB NL
KONINKLIJKE HOOGOVENS EN STAAL
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KONINKLIJKE HOOGOVENS EN STAAL
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B6/00—Internal feedback arrangements for obtaining particular characteristics, e.g. proportional, integral or differential
    • G05B6/05—Internal feedback arrangements for obtaining particular characteristics, e.g. proportional, integral or differential fluidic

Definitions

  • the domes should be able to withstand temperatures up to about 1800 C during operation, and also have to withstand considerable temperature variations in short time intervals during heating up and cooling down.
  • the invention aims at providing such a structure of the dome of such stoves that such cracks cannot or can hardly occur and even if they occur, will not do harm.
  • a structure according to the invention'as given above is characterized in that the dome passes into the vertical masonry structure below it by means of a continuous series of elements which are pivotally connected both to the stove structure below it close to the upper edge of the vertical masonry structure and to the lower edge of the dome.
  • the said pivoting elements have the shape of columns being more or less in line with the adjacent part of the dome for each column, the pivots being formed by supporting surfaces having the shape of faces being parts of circular cylinders on the one hand at the upper ends of the columns and the lower edge of the dome and on the other hand at the upper edge of the vertical masonry structure.
  • pivotable columns also by their greater length, can take up considerable differences in dilatation much more easily than rollers. More important, however, is that the rollers should be cooled locally in order to avoid their being sintered to one mass with the surrounding brick structures. Moreover, as a result of such cooling of the rollers, the adjacent part of the dome will become too cold. This would again cause serious cracks in the dome as a result of the discontinuity in the dilatation characteristics of the refractory material of the dome in the temperature region at which this dome would have to operate.
  • the dome according to the invention will have obtained a free possibility of movement with respect to the remainder of the structure and also as the dome is allowed to obtain a substantially constant temperature, it is thereby made possible to build up this dome entirely from silicon bricks.
  • each column is substantially only allowed to rotate about one axis and it is thus restricted in its possibilities of movement by all other columns being pivotable about axes having different directions. This avoids the dome to move around its own axis.
  • This object is according to the invention obtainable if the upper end of the vertical masonry structure below the dome is provided at least in part with vertically extending expansion joints, said upper end being backed up by means which leave the shape thereof substantally unaltered with considerable varying temperatures of the vertical masonry structure.
  • Such means could, e.g., have the shape of an annular element around the upper edge of the vertical masonry structure, such an annular element being known as such, the dome passing into said annular element through the columns.
  • the means for backing up the said upper end as a rule consist of an obvious steel structure, provided in a region where the temperature is always sufficiently low.
  • this dome should preferably have the shape of a segment of a sphere which in a section along a meridian covers an arc of to this segment of a sphere merging into a surface of revolution which in a meridian section consists of two circular arcs (one on each side) which have a radius which is 3 to 4 times larger than the radius of the segment of a sphere.
  • FIG. 1 gives a diagrammatic vertical section through a hot blast stove according to the invention
  • FIG. 2 gives detail II in FIG. 1 on a larger scale
  • FIG. 3 gives detail III of FIG. 1 on a larger scale
  • FIG. 4 gives the same detail as detail II of FIG. I (FIG.2), but of a different embodiment.
  • reference numeral 1 indicates a vertical cylindrical refractory brick wall of a hot blast stove.
  • This stove as shown has an interior burner stack 2, which is separated from the space 4 by a separating wall 3.
  • space 4 there is a pile of refractory bricks adapted to take up heat from hot gases and to give off heat to air to be preheated and such a pile of bricks is not shown but is quite usual and known as such.
  • dome 5 At the upper end the structure is closed by dome 5 of refractory material symmetrical to a vertical central axis.
  • dome 5 Around this structure there is a steel jacket as is usual, which is not shown.
  • a grid 9 supports the said pile of bricks in space 4. There is an opening 10 below this grid for allowing gases to escape after giving off their heat to the pile of bricks and for cold air to enter the stove for being heated.
  • An opening 11 in wall 1 in the burner stack allows the heated air to leave the preheater.
  • the dome consists of a part 12 having the shape of a segment of sphere, passing into the dome part I3 which is part of a surface of revolution.
  • the radius of the spherical part 12 is about 35 percent of the diameter of the outer wall 1 and in a section through a meridian covers an arc of 104.
  • the dome part 13 merges without a sharp transition into part 12 and in a meridian section part 13 has a radius which is about 3.7 times the radius of segment 12.
  • the transition zone of dome part 12 into dome part 13 has been shown by a dotted line in FIGS. 1 and 2.
  • the dome 5 is supported pivotally on the outer wall 1'.
  • FIGS. 2 and 3 this support has been shown in more detail, FIG. 2 showing the support in a vertical section according to detail II in FIG. I and according to the line II-Il in FIG. 3.
  • FIG. 3 shows detail III of FIG. I in a view from the interior radially outwards.
  • the lower edge of dome part 13 is rounded according to a semi-circular shape.
  • the semi-cylinder thus formed fits into semi-cylindrical concavities in the upper ends of columns 14.
  • To obtain such straight parts it is possible to have the bricks in the lower part of the dome part 13 follow such a configuration that this lower edge only consists of a number of straight parts.
  • the top part of the vertical masonry structure of wall 1 is provided with vertical expansion joints or slots 17, closing when the stove reaches the operating temperature, or at least closing partly, serving to avoid high compression stresses in the bricks and high tensile stresses in the steel outer lining when the stove is at operating temperature.
  • the columns 14 have the same thickness as dome part 13, e.g., somewhat more than 30 cm.
  • the width of the columns 14 is preferably about 60 cm.
  • FIG. 4 detail II of FlG.l is shown for a different embodiment, in which the dome is not directly supported by the vertical masonry of the stove.
  • a steel shell 18 surrounds this masonry and merges upwardly into an annular part 23 flaring outwardly and merging itself upwardly into the steel outer structure of the dome.
  • Annular part 23 is supported by a row of steel brackets or struts 24 around the outside of the stove.
  • the vertical masonry of the stove in the top part is here shown to consist of three layers 19, 20 and 21, having vertical dilatation joints 17 in planes through the axis of the regenerator similar to those in FIGS. 2 and 3.
  • the annular part 23 with brackets 24 are positioned in a relatively cool area, so that they do not expand considerably when the stove is heated.
  • the diameter of the vertical masonry 19, 20 and 21 remains substantially unaltered.
  • the expansion of this masonry by heating is thus almost entirely taken up by the joints l7 dimensioned so as to be entirely closed in operating conditions of the highest temperature.
  • the annular part 23 supports pivoting blocks 25, into which columns 26 fit in a pivoting manner.
  • These refractory columns are essentially of the same shape and kind of material as the columns 14 in the previous embodiment. They support the dome by pivoting connection with the lower edge of the inner dome 27 of refractory bricks. Outside this dome 27 a second refractory brick layer 28 is present, in contact with the steel outer lining of the dome.
  • the vertical masonry wall could, instead thereof, be flared outwardly to overly the annular part 23, in which case the pivoting blocks will be positioned on top of this part of the vertical masonry wall of the regenerator.
  • Many details of the regenerator which are not important for understanding the invention, have not been shown and described. So, it will be clear that there is a steel dome over the refractory dome 5 and a porous, somewhat elastic heat-insulating layer between these domes, as is usual. Such details will be clear to the expert.
  • a heat regenerator in particular a hot bast stove for a blast furnace plant, comprising an upstanding masonry structure, closed on top by a dome of refractory bricks,
  • characterizedinthatthesaidpivotingelements have the shape of columns being more or less in line with the adjacent part of the dome for each column, the pivots being formed by supporting surfaces having the shape of faces being parts of circular cylinders on the one hand at the upper ends of the columns and the lower edge of the dome and on the other hand at the upper edge of the vertical masonry structure or other structure below such columns.
  • characterizedinthatthecolumnsinthe direction of their mutual row or series (so in the peripheral direction of the stove) have a dimension which for each of them is l to 2 times larger than the dimension of the columns in their thickness direction (about radially of the stove).
  • c haracterizedinthatthe pivotsatbothendsof the columns have convex upper surfaces cooperating with concave lower surfaces.
  • characterizedinthattheupperendofthevertical masonry structure below the dome is provided at least in part with vertically extending expansion joints, said upper end being backed up by means which leave the shape thereof substantially unaltered with considerably varying temperatures of the vertical masonry structure.
  • a heat regenerator according to claim 1 having the shape of a cylindrical hot blast stove with a circular cross-section and interior burner stack,
  • characterizedinthatthetoppartofthedome has the shape of a segment of a sphere which in a section along a meridian covers an arc of to 1 l0, this segment of a sphere merging into a surface of revolution which in a meridian section consists of two circular arcs (one on each side) which have a radiuswhich is 3 to 4 times larger than the radius of the segment ofa sphere.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US00120267A 1970-03-03 1971-03-02 Heat regenerator particulary a hot blast stove for a blast furnace plant Expired - Lifetime US3713632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7003023A NL7003023A (enrdf_load_html_response) 1970-03-03 1970-03-03

Publications (1)

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US3713632A true US3713632A (en) 1973-01-30

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ID=19809482

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US00120267A Expired - Lifetime US3713632A (en) 1970-03-03 1971-03-02 Heat regenerator particulary a hot blast stove for a blast furnace plant

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US (1) US3713632A (enrdf_load_html_response)
JP (1) JPS5338242B1 (enrdf_load_html_response)
BE (1) BE763701A (enrdf_load_html_response)
DE (1) DE2110185C3 (enrdf_load_html_response)
FR (1) FR2081662B1 (enrdf_load_html_response)
GB (1) GB1295192A (enrdf_load_html_response)
LU (1) LU62719A1 (enrdf_load_html_response)
NL (1) NL7003023A (enrdf_load_html_response)
SU (1) SU386521A3 (enrdf_load_html_response)
ZA (1) ZA711281B (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110200958A1 (en) * 2010-02-12 2011-08-18 Van Laar Floris Hot Blast Stove Dome and Hot Blast Stove

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110200958A1 (en) * 2010-02-12 2011-08-18 Van Laar Floris Hot Blast Stove Dome and Hot Blast Stove
US9194013B2 (en) * 2010-02-12 2015-11-24 Allied Mineral Products, Inc. Hot blast stove dome and hot blast stove

Also Published As

Publication number Publication date
NL7003023A (enrdf_load_html_response) 1971-09-07
DE2110185B2 (de) 1978-02-02
FR2081662B1 (enrdf_load_html_response) 1975-06-06
GB1295192A (enrdf_load_html_response) 1972-11-01
FR2081662A1 (enrdf_load_html_response) 1971-12-10
DE2110185A1 (de) 1971-09-23
BE763701A (enrdf_load_html_response) 1971-09-03
LU62719A1 (enrdf_load_html_response) 1971-08-23
ZA711281B (en) 1971-11-24
SU386521A3 (enrdf_load_html_response) 1973-06-14
DE2110185C3 (de) 1978-09-28
JPS5338242B1 (enrdf_load_html_response) 1978-10-14

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