DESCRIPTION
Title of Invention: Sintering Pallet Carriage, Sintering
Machine Provided With Same, and Method of Production of
5 Sintered Ore
Technical Field
[0001] The present invention relates to a sintering
pallet carriage which is used for producing a sintered
10 ore for use for a material for a blast furnace, a
sintering machine which is provided with the same, and a
method of production of sintered ore, more particularly
relates to a sintering pallet carriage which is suitable
for production of sintered ore under conditions of a
15 thickness of a material charged layer greater than 600
mm, a sintering machine which is provided with the same,
and a method of production which uses the same.
Background Art
20 [0002] In a bottom suction type sintering machine
which produces a sintered ore for use for a material for
a blast furnace, as shown in FIG. 5, first, hearth ore is
charged from a hearth hopper 101 on grate bars 103a of a
bottom surface of a sintering pallet carriage 103 to form
25 a 30 mm or so thickness hearth ore 102. Next, a sintering
material 104 comprised of the main ingredient powder iron
ore or other iron-bearing material, limestone or other
secondary materials, and powder coke or other fuel is
conveyed to and stored at a surge hopper 105, then fed
30 out from the drum feeder and charged through a chute 106
on the hearth ore 102 of the sintering pallet carriage
103 so as to form a material charged layer 107. Next,
powder coke in the top surface layer of the material
charged layer 107 is ignited by an ignition furnace 108,
35 then, while applying suction negative pressure and
sucking the air downward, the sintering pallet carriage
103 is successively moved horizontally to an ore
• - 2 -
discharge part. During that time, the powder coke in the
material charged layer 107 burns and the heat of
combustion is used to successively sinter the material
from the upper layer to the lower layer so as to produce
5 the sintered ore.
[0003] In the sintering process where sintering
proceeds from the upper layer toward the lower layer of
the material charged layer 107, first, a sintering
completion layer 107a where sintering has been completed
10 (hereinafter referred to as the "sinter cake") is formed
at the upper layer. At the material charged layer right
under this sinter cake, a soft melted layer in the middle
of combustion and sintering is formed. Below that, there
is an unsintered material charged layer, but this soft
15 melted layer and material charged layer are compressed by
the load of the sinter cake and becomes high in bulk
density. For this reason, the porosity of the material
charged layer which includes the soft melted layer below
the sinter cake falls or the porosity becomes uneven.
20 Further, this leads to a drop in the speed of combustion
or uneven combustion of the carbonaceous material in the
material charged layer. As a result, there is the problem
that the productivity of the sintered ore falls due to
the drop in the sintering speed or drop in the sintered
25 shaped product yield.
[0004] As the method for reducing the load of the
sinter cake on the soft melted layer and material charged
layer under the sinter cake, as shown in FIG. 6, the
stand support sintering method which provides stands 109
30 which support sinter cake on the sintering pallet
carriage 103 (hereinafter referred to as "sinter cake
support stands") while performing sintering has been
invented (for example, PLT's 1 and 2).
[0005] With this stand support sintering method,
35 sintering proceeds from the upper layer of the material
charged layer whereby the sinter cake increases in
thickness. When the sinter cake becomes a thickness
• - 3 -
reaching the height position of the top parts of the
sinter cake support stands, the sinter cake is supported
by the top parts of the sinter cake support stands, the
load of the sinter cake applied to the bottom layer is
5 reduced, the porosity is improved, and the productivity
is remarkably improved (hereinafter the effect is
referred to as the "sinter cake support effect").
Citations List
10 Patent Literature
15
[0006]
A1
PLT
PLT
PLT
PLT
PLT
A1
PLT 1: Japanese Patent Publication No. 2-293586
2: Japanese Patent Publication No. 4-168234 A1
3: Japanese Patent No. 2715218
4: Japanese Patent Publication No. 6-323745 A1
5: Japanese Patent Publication No. 9-209050 A1
6: Japanese Patent Publication No. 2010-144946
20 Summary of Invention
Technical Problem
[0007] The sinter cake support effect is the effect
obtained after the sinter cake is supported by the top
parts of the sinter cake supports stand. In order for the
25 sintering to proceed as fast as possible from the start
of sintering in the state with a sinter cake support
effect, it is desirable to use sinter cake support stands
as high in height as possible.
However, the sinter cake is locally supported at the
30 top parts of the sinter cake support stands, so if the
height of the sinter cake support stands is too great and
as a result the supported thickness of the sinter cake
(hereinafter suitably referred to as the "supported
sinter cake thickness") is too thin, as shown
35 schematically in FIG. 7, there is the problem that in the
sintering process, cracks 110 form at the surface of the
sinter cake above the sinter cake support stands (or, as
• - 4 -
clear from the schematic view of FIG. 1, the (thickness
(h) of material charged layer - height (H) of sinter cake
support stand) becomes the "supported sinter cake
thickness"). If cracks form at the surface of the sinter
5 cake, a flow of gas occurs preferentially at the location
of the cracks, so the lower layer becomes unevenly fired,
that is, so-called "uneven firing" is assisted and the
productivity falls.
[0008] Therefore, it is necessary to avoid cracks at
10 the surface of the sinter cake.
It is clear that if the "supported sinter cake
thickness" is too thin, cracks form. Further, regarding
the formation of cracks at the surface of the sinter
cake, there is no room for doubt that there is a lower
15 limit to the "supported sinter cake thickness", in other
words, that there is an upper limit of the sinter cake
support stand height. Therefore, to avoid cracks, it is
sufficient to select the height of the sinter cake
support stands so that the "supported sinter cake
20 thickness" becomes greater than the lower limit thickness
at which cracks form. In other words, the height of the
sinter cake support stands should be set lower than the
upper limit of the sinter cake support stand height which
corresponds to the lower limit of the "supported sinter
25 cake thickness" where cracks occur.
[0009] However, the mechanism of formation of cracks
at the surface of the sinter cake is not sufficiently
elucidated. Due in part to this, there are no guidelines
on how to determine the lower limit of the "supported
30 sinter cake thickness" or upper limit of the sinter cake
support stand height.
In view of this situation, PLT 3 shows the idea of
determining the upper limit of the sinter cake support
stand heights by the ratio of the height of the sinter
35 cake support stands to the thickness of the material
charged layer (hereinafter suitably referred to as "ratio
of height to thickness"). Specifically, based on the
• - 5 -
result that cracks formed in the surface of the sinter
cake when using 450 mm or higher height sinter cake
support stands for a material charged layer of the
typical thickness of 600 mm which has been used in the
5 past, a "ratio of height to thickness" of 75% was shown
as the upper limit of the sinter cake support stand
height.
Based on this thinking, to avoid the formation of
cracks, the greater the thickness of the material charged
10 layer, the greater the "supported sinter cake thickness"
has to be made. As explained above, when the material
charged layer is 600 mm, the lower limit of the
"supported sinter cake thickness" is 150 mm. Even when
using a 800 mm material charged layer, the lower limit of
15 the "supported sinter cake thickness" becomes 200 mm (the
upper limit of the height of the sinter cake support
stands is 600 mm) .
[0010] According to this conventional method, the load
of the sinter cake which is applied to the sinter cake
20 support stands becomes larger the greater the thickness
of the material charged layer. As a counter action, force
which is applied from the sinter cake support stands to
the sinter cake similarly becomes larger. Along with the
increase in the force which is applied to the sinter
25 cake, cracks easily form at the sinter cake. In
particular, if the thickness exceeds 720 mm, along with
the increase of the load of the sinter cake, cracks
easily form in the sinter cake. Therefore, the thinking
that the greater the thickness of the material charged
30 layer, the more a thick "supported sinter cake thickness"
becomes necessary is easily understandable.
[0011] However, in PLT 3, the strength of the sinter
cake was not considered at all. In general, cracks in a
solid material form when the stress which is applied to
35 the material exceeds the strength of the solid material,
and this is believed to apply to sinter cake as well.
Therefore, it would appear meaningful to review the
• - 6 -
method of finding the lower limit of the "supported
sinter cake thickness", that is, the upper limit of the
height o·f the sinter cake support stands, while
considering the strength of sinter cake.
5 [0012] The principle of the bottom suction system of
sintering is the ignition of the carbonaceous material at
the surface part of the material charged layer in the
ignition furnace and using bottom suction to successively
burn the carbonaceous material and transfer the heat
10 downward. In principle, the upper layer part of the
material charged layer still is only preheated a little
by burning of the fuel and the thickness of the soft
melted layer with the high air flow resistance is thin,
so the air flow resistance of the material charged layer
15 as a whole is also small. For this reason, the upper
layer part of the material charged layer is low in
temperature and the carbonaceous material burns too fast,
so the combustion and melting reaction (sintering
reaction) becomes insufficient and the strength of the
20 sinter cake formed becomes lower.
As explained above, it is known that the strength of
the sinter cake is greatly dependent on the air flow
resistance or porosity and that the upper layer sinter
cake of the material charged layer is lower in strength
25 than the lower layer sinter cake.
[0013] The inventors took note of the fact the above
mechanism due to which a difference occurs in strength
between the upper layer sinter cake and the lower layer
sinter cake can also be applied to the strength of the
30 sinter cake between material charged layers differing in
thickness. A material charged layer under high thickness
conditions becomes larger in air flow resistance than a
material charged layer under low thickness conditions by
the amount of greater thickness, so the combustion of the
35 upper layer of the material charged layer under high
thickness conditions proceeds slower than the combustion
of the upper layer of the material charged layer under
• - 7 -
low thickness conditions. Therefore, the upper layer
sinter cake of the material charged layer under high
thickness conditions is preheated whereby it becomes
higher in strength than the upper layer sinter cake of
5 the material charged layer under low thickness
conditions.
That is, from the viewpoint of the porosity, the
greater the thickness of the material charged layer, the
higher the strength of the upper layer "supported sinter
10 cake thickness" part of the sinter cake of the material
charged layer is believed to be. Based on this thinking
that the strength of upper layer "supported sinter cake
thickness" part of the sinter cake of the material
charged layer depends on the thickness of the material
15 charged layer, it is believed that the upper limit of the
sinter cake support stand height of the "ratio of height
to thickness" of 75% which is shown in PLT 3 was just the
upper limit in the strength of the sinter cake in the
case of a thickness condition of "600 mm thickness".
20 Therefore, when producing sintered ore under the
conditions of a 600 mm or higher thickness of a material
charged layer, there is a possibility of avoiding cracks
at the surface of sinter cake while using sinter cake
support stands of a stand height of a "ratio of height to
25 thickness" higher than 75%.
[0014] Further, when following the upper limit rule of
a height of the sinter cake support stands of a "ratio of
height to thickness" of 75%, the greater the thickness of
the material charged layer, the greater the thickness of
30 the material charged layer not subject to the sinter cake
support effect, so the ratio of low quality sintered ore
becomes higher and the shaped product yield falls.
Due to the trend in recent years toward higher
productivity and higher thickness at the time of
35 production of sintered ore, it is extremely important to
find new upper limit rules which better match high
thicknesses of material charged layers.
• - 8 -
[0015] Further, regarding PLT 4, this makes proposals
for reducing the drop in productivity due to the
deterioration in the porosity due to compression of the
sinter cake and the drop in speed of combustion of coke
5 accompanying this, but only focuses on the thickness of
the sintering material and does not result in a
sufficient effect. Furthermore, PLT 5 proposes the
regular dispersion of the sinter cake support members for
raising the coke sintering speed, while PLT 6 proposes
10 increasing the lifetime of sinter cake support members,
but does not specifically show the structure of sinter
cake support stands and their method of arrangement which
are optimized for making use of the sinter cake support
effect to the maximum extent so as to improve the shaped
15 ·product quality and productivity.
[0016] The present invention was made in consideration
of the above situation and has as its object the
provision of a sintering pallet carriage which has sinter
cake support stands which avoid cracks at the surface of
20 the sinter cake which is formed right above the support
stands while making use of the sinter cake support effect
to the maximum extent so as to improve the shaped product
quality and productivity, a sintering machine which is
provided with the same, and a method of production of
25 sintered ore which uses the same.
Solution to Problem
[0017] The inventors engaged in intensive studies to
achieve the above object and as a result discovered the
30 upper limit rule of the sinter cake support stand height
for avoiding cracks in the surface of the sinter cake
formed right above the support stands when producing
sintered ore under conditions of a material charged layer
of a thickness higher than 600 mm, in particular 720 mm.
35 [0018] The gist of the present invention for solving
the above problem is as follows:
(1) A sintering pallet carriage which is used for
• - 9 -
producing sintered ore under conditions of a thickness of
a material charged layer which is thicker than 600 mm,
the sintering pallet carriage characterized in that the
sintering pallet carriage is provided, in the width
5 direction of the pallet carriage, with a plurality of
sinter cake support stands which are set so that their
side surfaces become substantially parallel to the
direction of advance of the pallet carriage and which
have a height (H) of H=h-120 [mm] ( "h" is the thickness
10 of the material charged layer) or less,
the sinter cake support stands have a width (Ws) of the
top surface of 30 [mm]SW5~60 [mm], and the number of the
sinter cake support stands is selected so that the
distance between adjoining sinter cake support stands and
15 the distance between an adjoining sinter cake support
stand and side wall of the sintering pallet carriage in
the width direction of the pallet carriage does not
exceed 1250 mm.
(2) A sintering machine characterized by being provided
20 with a sintering pallet carriage as set forth in (1).
(3) A method of production of sintered ore comprising
providing a sintering pallet carriage with a plurality of
sinter cake support stands which are set in parallel in
the direction of advance, have a height (H) of H=h-120
25 [mm] ( "h" is the thickness of the material charged layer)
or less, and have a width (Ws) of the top surface of 30
[mm]SWs~60 [mm] so that the distance between adjoining
sinter cake support stands and the distance between an
adjoining sinter cake support stand and side wall of the
30 sintering pallet carriage in the width direction of the
pallet carriage does not exceed 1250 mm so as to support
a sinter cake while producing sintered ore under
conditions of a thickness of the material charged layer
greater than 600 mm.
35
Advantageous Effects of Invention
[0019] According to the sintering pallet carriage of
• - 10 -
the present invention, there are provided a sintering
pallet carriage which is used for producing sintered ore
under conditions of a thickness of the material charged
layer greater than 600 mm and a sintering machine
5 provided with the same, wherein the sintering pallet
carriage is provided, in the width direction of the
sintering pallet carriage, with a plurality of sinter
cake support stands which are set so that their side
surfaces become substantially parallel to the direction
10 of advance of the pallet carriage and which have a height
(H) of H=h-120 [mm] ("h" is the thickness of the material
charged layer) or less, that is, wherein sinter cake
support stands are used which have a height H=h-120[mm]
("h" is the thickness of the material charged layer) of a
15 "ratio of height to thickness" exceeding 75% higher than
the height of conventional sinter cake support stands, so
simple changes may be used to avoid cracks at the surface
20
of the sinter cake which is formed right above the
support stands while making use of the sinter cake
support effect to the maximum extent so as to improve the
shaped product quality and productivity.
[0020] According to the sintering pallet carriage of
the present invention, the sinter cake support stands are
made ones having a width (Ws) of the top surface of 30
25 [mm]$W8~60 [mm] and the number of the sinter cake support
stands is selected so that the distance between adjoining
sinter cake support stands in the width direction of the
pallet carriage and the distance between an adjoining
sinter cake support stand and side wall of a sintering
30 pallet carriage do not exceed 1250 mm, and therefore it
is possible to avoid cracks in the surface of the sinter
cake which is formed right above the support stands and
the precursor phenomenon of ridges while making use of
the sinter cake support effect to the maximum extent so
35 as to improve the shaped product quality and
productivity.
[0021] According to the sintering machine and method
•
5
- 11 -
of production of sintered ore of the present invention,
it is possible to avoid cracks in the surface of the
sinter cake while using the sinter cake support effect to
improve the shaped product quality and productivity.
Brief Description of Drawings
[0022] FIG. 1 is a schematic view for explaining the
relationship of height of the sinter cake support stands
and material charged layer of the present invention.
10 FIG. 2 is a plan view of a sintering pallet carriage on
which sinter cake support stands are provided and a
schematic view for explaining the relationship of
relative position and size of the top surfaces of the
sinter cake support stands and top surface of the
15 sintering pallet carriage of the present invention.
FIG. 3 is a schematic perspective view of a sintering
pallet carriage which is provided with sinter cake
support stands for explaining the distance between
adjoining sinter cake support stands and the distance
20 be~ween an adjoining sinter cake support stand and side
wall of the sintering pallet carriage of the present
invention.
FIGS. 4 are views of a sintering pallet carriage which is
provided with sinter cake support stands of the present
25 embodiment, wherein (a) is a schematic plan view and (b)
is a schematic cross-sectional view along the line A-A'
of (a).
FIG. 5 is a schematic cross-sectional view of a bottom
suction type sintering machine.
30 FIG. 6 is a schematic perspective view of a sintering
pallet carriage which is provided with sinter cake
support stands.
35
FIG. 7 is a view which schematically shows cracks in the
surface of the sinter cake.
Description of Embodiments
[0023] Below, a sintering pallet carriage, a sintering
•
5
- 12 -
machine provided with the same, and a method of
production of sintered ore of embodiments applying the
present invention will be explained in detail using the
drawings.
[0024] FIG. 1 is a cross-sectional view which
schematically shows the vicinity of a sinter cake support
stand in a material charged layer in the sintering
process on a sintering pallet carriage.
In the sintering process, the material charged layer
10 1 on the pallet carriage 3 is comprised of a sintering
completion layer (sinter cake) 1a at which sintering has
been completed at the upper layer, a soft melted layer 1b
in the middle of combustion under that, and an unsintered
material charged layer 1c under that and of a hearth
15 layer 2. The sinter cake 1a is supported by the sinter
cake support stands 4.
[0025] The thickness (h) of the material charged layer
1 exceeds 600 mm, while the height (H) of the sinter cake
support stands 4 which are placed on the pallet carriage
20 3 is made H=h-120 mm or less.
By making the upper limit of the height (H) of the
sinter cake support stands 4 a value 120 mm lower than
the thickness (h) of the material charged layer 1, in a
method of production of sintered ore under high thickness
25 conditions of a material charged layer over 600 mm, a
"supported sinter cake thickness" where cracks do not
form is formed right above the support stands.
That is, by setting the height of the sinter cake
support stands in the range enabling a "supported sinter
30 cake thickness" which is formed right above the support
stands of at least 120 mm to be secured, it is possible
to avoid cracks in the surface of the sinter cake which
is formed right above the support stands while using the
sinter cake support effect to improve the shaped product
35 quality and productivity of sintered ore.
[0026] If the height (H) of the sinter cake support
stands 4 becomes higher than (thickness (h)-120) mm, the
• - 13 -
"supported sinter cake thickness" becomes thinner than
120 mm and cracks form at the surface of the sinter cake
formed right above the support stands. Further, the lower
limit is not particularly limited, but if the height (H)
5 of the sinter cake support stands 4 is less than 450 mm,
there is little improvement in the flame front speed
(FFS), so 450 mm or more is preferable.
[0027] FIG. 2 is a plan view of a sintering pallet
carriage 3 on which the sinter cake support stands 4 are
10 set and is a schematic view for explaining the
relationship of the relative position and size between
the top surfaces 4a of the sinter cake support stands 4
and the bottom surface of the sintering pallet carriage
3 •
15 In the figure, the direction from the upstream end
3A to the downstream end 3A of the sintering pallet
carriage is the direction of advance of the sintering
pallet carriage.
[0028] Note that, the width (W8 ) of the top surfaces of
20 the sinter cake support stands 4 explained below, as
shown in FIG. 2, means the dimension (mm) of the top
surfaces parallel to the width direction of the pallet
carriage, while the length (L8 ) of the top surfaces means
the dimension (mm) parallel to the direction of advance
25 of the pallet carriage.
The width (W8 ) of the top surfaces of the sinter cake
support stands 4 is preferably 30 [mm]~8~60 [mm].
If the width (W8 ) of the top surfaces is narrower
than 30 mm, the surface support effect on the upper layer
30 sinter cake becomes insufficient, the result becomes a
state close to linear support, and cracks easily form in
the sinter cake parallel to the direction of advance.
Further, if the width (W8 ) of the top surfaces is greater
than 60 mm, the amount of heat removal by the top surface
35 becomes greater and the shaped product quality and
productivity of the sintered ore falls.
[0029] The longer the length (L8 ) of the top surfaces
• - 14 -
of the sinter cake support stands 4, the greater the area
which supports the sinter cake, so it is possible to
avoid stress concentration at the upper layer sinter
cake. This is preferable for avoiding cracks. However, to
5 maintain a good peelability of the sinter cake from the
sintering pallet carriage at the sintering machine ore
discharge part, as shown in FIG. 2, a region not
supporting the sinter cake is often provided at the
downstream end 3B of the sintering pallet carriage in the
10 direction of advance.
[0030] FIG. 3 is a schematic perspective view of a
sintering pallet carriage provided with sinter cake
support stands of the present invention.
The distance d 1 between adjoining sinter cake support
15 stands in the width direction of the pallet carriage and
the distance d2 between an adjoining sinter cake support
stand and side wall of the sintering pallet carriage are
both smaller than 1250 mm.
This is because if either d 1 or d 2 is 1250 mm or
20 more, the load which is applied per sinter cake support
stand becomes excessive and cracks easily form in the
surface of the sinter cake which is formed right above
the support stands.
When making the width of the sintering pallet
25 carriage greater than in the past, the number of sinter
cake support stands should be determined so that the
distance d 1 between adjoining sinter cake support stands
and the distance d2 between an adjoining sinter cake
support stand and side wall of a sintering pallet
30 carriage not exceed 1250 mm.
35
Examples
[0031] A sintering pallet carriage of a length La of
1500 mm and a width W0 of 5500 mm was used.
Further, as shown in FIG. 4, on the sintering pallet
carriage 13, a large number of groups of grate bars (13a)
which are oriented parallel to the direction of advance
• - 15 -
of the pallet carriage are arranged in three rows (13A,
13B, 13C) in a direction perpendicular to the pallet
direction of advance. Sinter cake support stands 14a, 14b
which are plateau shaped when seen from the side are
5 arranged in groups of four in the width direction of the
pallet carriage at the two back rows (13B, 13C) of the
groups of grate bars (13a). Regarding the distance d1
between the adjoining sinter cake support stands in the
width direction of the pallet carriage, the distances
10 between the first-second stands and third-fourth stands
in the width direction of the pallet carriage were made
1010 mm and the distance between second-third stands was
made 1000 mm. Further, the distance d2 between a sinter
cake support stand and side wall of the sintering pallet
15 carriage was made 1240 mm.
1010x2+1000+1240x2=5500 mm (pallet width)
The sinter cake support stands have schematically
plateau plate shapes with cross-sections horizontal to
the direction of advance of the pallet carriage. The
20 cross-section in the thickness direction has a tapered
shape with a plate thickness which becomes thinner from
the bottom to the top from the viewpoint of improvement
of the ore discharging ability. The stands are set so
that the side surfaces become substantially parallel to
25 the direction of advance of the pallet carriage. Further,
the lengths and widths of the bottoms of the sinter cake
support stands (bottoms of plateau shapes) are
respectively 500 mm and 100 mm, while the lengths and
widths of the top parts (tops of plateau shapes) are
30 respectively 200 mm and 47 mm.
[0032] Table 1 shows the presence of cracks at the
surface of the sinter cake which is formed right above
the support stands, the TI (tumbler index) and shaped
product yield of sintered ore for sintered ore which is
35 produced using sintering pallet carriages according to
various examples of the present invention. Further, Table
2 shows comparative examples. In the tables, "h-H"
•
5
- 16 -
corresponds to the "supported sinter cake thickness"
which is formed right about the support stands. Further,
the existence of cracks was judged by visual observation.
Table 1
Stand H [mm]
Thickness "h"
[rom]
Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9
450 500 550 600 650 700 750 800 850
600 650 670 720 770 820 870 920 970
h-H [mm] 150 150
Cracks None None
TI(%) 77.5 78.6
Shaped 76.9 77.8
product yield
(%)
Comp. Ex.
Stand H [rom] 500
Thickness "h" [rom] 610
h-H [rom] 110
Cracks Yes
120 120
None None
79.0 80.1
78.1 79.0
Table 2
1 Comp. Ex.
600
710
110
Yes
120
None
81.2
79.9
120
None
82.2
80.8
2 Comp. Ex.
700
810
110
Yes
120
None
83.3
81.7
120
None
84.4
82.7
3 Comp. Ex.
800
910
110
Yes
[0033] Examples 1 to 9 had a thickness (h) of the
4
120
None
85.5
83.6
material charged layer of 600 mm to 970 mm. Under these
10 conditions, they had a height of the sinter cake support
stands (H) of (thickness (h) of material charged layer -
12 0) [mm] or less. A "supported sinter cake thickness"
formed right above the support stand of 120 mm or more
was secured, so cracks were not formed in the surface of
15 the upper layer sinter cake. As a result, the TI strength
and shaped product yield of the sintered ore of Examples
1 to 9 were good.
[0034] Further, as the thickness of the material
charged layer became greater from Examples 1 to 9, the
20 "supported sinter cake thickness" which was formed right
above the support stands increased and the load due to
this sinter cake also increased. However, due to the
improvement of strength of the sinter cake due to the
increase in thickness of the material charged layer, no
25 cracks were formed in the surface of the upper layer
sinter cake.
[0035] As opposed to this, Comparative Examples 1 to 4
had a height of the sinter cake support stands (H) higher
• - 17 -
than (thickness (h) of material charged layer -120) [mm],
had a "supported sinter cake thickness" which is formed
right above the support stands of 110 mm, that is, lower
than 120 mm, and had a thickness (h) of the sintering
5 material charged layer of 610 mm (Comparative Example 1),
710 mm (Comparative Example 2), 810 mm (Comparative
Example 3), and 910 mm (Comparative Example 4). In each
case, cracks were formed.
10
Reference Signs List
[0036] 1 material charged layer
1a sinter cake
3 sintering pallet carriage
3A upstream end
3B downstream end
15 4 sinter cake support stand
4a top surface
20
L0 length of sintering pallet carriage
W0 width of sintering pallet carriage
H height of sinter cake support stand
Ls length of sinter cake support stand
Ws width of sinter cake support stand
dl distance between adjoining sinter cake
d2 distance between adjoining sinter cake
support
support
and side wall of sintering pallet carriage
stands
stand
25 L0 length of sintering pallet carriage in direction of
advance
h thickness of material charged layer

CLAIMS
Claim 1
A sintering pallet carriage which is used for
producing sintered ore under conditions of a thickness of
5 a material charged layer which is thicker than 600 mm,
said sintering pallet carriage characterized in that
the sintering pallet carriage is provided, in
the width direction of the pallet carriage, with a
plurality of sinter cake support stands which are set so
10 that their side surfaces become substantially parallel to
the direction of advance of the pallet carriage and which
have a height (H) of H=h-120 [mm] ("h" is the thickness
of the material charged layer) or less,
said sinter cake support stands have a width
15 (Ws) of the top surface of 30 [mm]