JP2005281810A - Method and apparatus for supplying sinter to mobile trough cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent re-mixing of coarse grains and fine grains separated inside a sinter ore feed chute without increasing repair costs, and to stratify coarse grains in the lower layer on the trough, Provides a method and apparatus for feeding sintered ore to a mobile trough cooler that can stratify fines.
A feeder 1 for a mobile trough type cooler for sintered ore is provided with a chute 5 for sintering ore feeding below a discharge end 2a of a sintering machine 2, and further the sintering. A mobile trough cooler 9 is provided below the mining chute 5, and the sintered ore chute 5 extends obliquely with respect to the direction in which the mobile trough cooler 9 extends, The sintered ore A is fed from the mining chute 5 to the mobile trough cooler 9. The sinter ore supply chute 5 is provided inside thereof, and a lower layer on the trough 10 of the mobile trough cooler 9 using a partition plate 8 extending along the direction in which the sinter ore supply chute 5 extends. Coarse grains B are layered on the trough 10 and fine grains C are laminated on the upper layer of the trough 10.
[Selection] Figure 1

Description

  The present invention relates to a method and an apparatus for feeding a sintered ore to a mobile trough cooler.

Generally, high temperature (about 600-800 degreeC) sintered ore manufactured with the sintering machine is conveyed with a belt conveyor after being cooled with a cooler.
More specifically, as shown in FIG. 3 (refer to Patent Document 1), first, on the pallet 107 of the sintering machine 105, the floor mine 103 from the floor hopper 101 and the raw material supply hopper 102 are supplied. The sintering raw material 104 is charged. Then, the pallet 107 moves and enters the ignition furnace 106 where the coke in the sintering raw material 104 is ignited. The sintered raw material 104 in the ignited pallet 107 is combusted by suction of combustion gas from the lower surface of the pallet 107 and suction of combustion air from above the pallet 107, and is heated and sintered. Then, the pallet 107 is inverted in the sintering machine discharge section 105a, and the sintered ore on the pallet 107 is supplied to the crusher 108. In the crusher 108, the sintered ore is crushed to a maximum of about 200 mm, and the crushed sintered ore is supplied to the cooler 109. The temperature of the sintered ore at this time is about 600-800 degreeC, and it is necessary to cool to 150 degrees C or less so that conveyance with the below-mentioned belt conveyor 111 is possible.

  As shown in FIG. 4 (see Patent Document 1), the cooler 109 has a trough 120 to which crushed sintered ore is supplied. The trough 120 travels through an oval loop at a speed of about 2 rotations per hour. The trough 120 has a bottom plate 121 and side plates 122 extending upward from both sides thereof. The bottom plate 121 is a ventilation plate having a large number of child holes for introducing cooling air. The trough 120 itself is also structured to ventilate. A cooling chamber (not shown) is provided below the trough 120, and a hood 123 through which hot air after heat exchange passes is provided above the trough 120. A duct 124 is disposed in the hood 123, and a cooling fan 110 is provided in the duct 124. The cooling air passes from the lower side through a small hole formed in the bottom plate 121 of the trough 120, exchanges heat with high-temperature sintered ore, becomes hot air, passes through the hood 123 and the duct 124, and reaches the cooling fan 110. It has become. In this process, the sintered ore supplied to the trough 120 is cooled to 150 ° C. or lower. And the cooled sintered ore is conveyed by the further belt conveyor 111 shown in FIG.

  By the way, in the supply of the sintered ore to the trough 120, the sintered ore crushed by the crusher 108 is about 10 mm to about 20 mm as fine particles to fine particles having a maximum size of about 10 mm, and sometimes maximum. The coarse particles of about 200 mm are mixed. On the other hand, the maximum size of the small holes formed in the bottom plate 121 of the trough 120 through which the cooling air passes is a maximum dimension of about 20 mm to 30 mm. The maximum dimension is the largest dimension among all the measurement methods among the dimensions of the grains or the holes. For example, in the case of a hole, a circular hole indicates the diameter, and a square hole indicates the length of the longer side. The child hole is easily clogged with fine particles. Moreover, when coarse grains and fine grains are mixed, the filling rate of the sintered ore on the trough 120 is high, and the ventilation resistance is large. Thereby, there is a problem that the cooling efficiency is lowered and the temperature of the sintered ore cannot be lowered to a desired value. In addition, the coarse particles are difficult to cool. In particular, the coarse particles near the upper surface of the trough 20 are heat exchanged with relatively high temperature air exchanged in the lower layer of the packed bed. There is a problem that the belt of the belt conveyor 111 is promoted to deteriorate, or the belt is burnt out in some cases.

  For this reason, in the feeder for supplying the sinter cooler described in Patent Document 1, as shown in FIG. 5, the sinter supply is provided below the sinter discharge portion 105a of the sinter 105. A chute 131 is provided, a sieve 130 is interposed between the chute 131 for supplying the sinter ore and the trough 120 of the cooler 109, and the outlet of the net product discharge chute 132 attached to the sieve 130 is located upstream of the trough 120. The outlet of the net product discharging chute 133 is disposed above the downstream side of the trough 120 from the outlet of the net product discharging chute 132.

  According to the feeder for the sinter cooler, the sinter crushed by the crusher 108 is divided into coarse particles 134 and fine particles 135 by the sieve 130, of which the coarse particles 134 are discharged on the net. The fine grains 135 fall from the net chute 132 to the upstream side of the trough 120, and the fine grains 135 fall from the net product discharge chute 133 to the downstream side of the trough 120 and onto the coarse grains. Therefore, on the trough 120 of the cooler 109, as shown in FIG. 5, coarse particles 134 are formed in the lower layer and fine particles 135 are formed in the upper layer. As a result, clogging of the child hole formed in the bottom plate 121 of the trough 120 is prevented, the ventilation resistance is reduced, the cooling efficiency is improved, and the temperature of the sintered ore can be lowered to a desired value. Play. In addition, since the cooling air exchanges heat with the lower coarse particles 134 and then exchanges heat with the upper fine particles 135, the surface temperature of the coarse particles 135 becomes lower than the surface temperature of the fine particles 134. For this reason, while improving cooling efficiency, there also exists an effect that the dispersion | variation in the temperature of the sintered ore on the belt conveyor 111 of the back | latter stage of the cooler 109 reduces.

In addition, a device for charging a sintered ore into a sintered ore cooler described in Patent Document 2 is also provided to improve the cooling efficiency by supplying coarse particles to the lower layer and fine particles to the upper layer. Are known.
As shown in FIG. 6, this sinter ore charging apparatus transfers the crushed sintered ore between the feed chute 204 located below the hot screen 203 and the pallet 202 of the cooler 201 upstream of the cooler. A deflector chute 205 for rolling and dropping to the side is disposed, and the coarse particles 206 are supplied to the lower layer and the fine particles 207 are supplied to the upper layer through the deflector chute 205 so as to be segregated and supplied to the upper layer.

According to this sintered ore charging apparatus, since the coarse particles 206 can be segregated in the lower layer on the pallet 202 and the fine particles 207 can be segregated in the upper layer, clogging of the pallet 202 can be prevented and air permeability can be improved. As a result, the amount of exhaust heat recovered by the cooler 201 can be increased.
Japanese Patent Laid-Open No. 61-23727 Japanese Utility Model Publication No. 64-25698

  However, in the feeder for a sinter cooler disclosed in Patent Document 1, a sieve 130 is interposed between the chute 131 for supplying the sinter and the trough 120 of the cooler 109. Thus, the sintered ore can be divided into coarse particles 134 and fine particles 135, but the sintered ore handled by the sieve 130 is at a high temperature of about 600 to 800 ° C. and is hard. There is a problem that the main body and the net part of the sieve 130 that comes into contact with each other wear quickly, the frequency of repairing the main body and the net part of the sieve 130 increases, and the repair cost increases.

On the other hand, in the sintered ore charging apparatus disclosed in Patent Document 2, the sintered ore is naturally divided into coarse grains 206 and fine grains 207 by the deflector chute 205. Although the frequency of repair can be reduced, there is a problem that the separated coarse particles 206 and fine particles 207 are mixed again during the fall. For this reason, the lower layer on the pallet 202 is formed by mixing not only the coarse particles 206 but also the fine particles 207, and the upper layer is formed by mixing not only the fine particles 207 but also a large amount of the coarse particles 206. there were.
Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is to re-mix coarse grains and fine grains separated inside a chute for sinter ore supply without increasing repair costs. An object of the present invention is to provide a method and an apparatus for supplying a sinter ore to a mobile trough cooler that can prevent coarse grains from being formed in the lower layer on the trough and fine grains can be formed in the upper layer. .

  In order to solve the above-mentioned problems, the method of feeding sinter ore to the mobile trough type cooling machine according to claim 1 of the present invention includes a sinter for supplying sinter ore at the lower end of the discharge of the sinter. And a mobile trough cooler is provided below the sinter ore feed chute, and the sintered ore feed chute is inclined obliquely with respect to the extending direction of the mobile trough cooler. , When supplying the sintered ore from the sintered ore feed chute to the mobile trough cooler, provided in the sintered ore feed chute, A partition plate extending along the extending direction is used to form coarse particles in the lower layer on the trough of the mobile trough cooler and fine particles in the upper layer on the trough.

  According to a second aspect of the present invention, there is provided an apparatus for feeding a sintered ore to a mobile trough type cooling machine, wherein a sinter for supplying a sintered ore is provided below a discharge end of the sintering machine. A mobile trough cooler is provided below the ore feed chute, and the sintered ore feed chute is inclined obliquely with respect to a direction in which the mobile trough cooler extends, An apparatus for feeding sintered ore from a mining chute to the mobile trough-type cooler, wherein a partition plate extending along a direction in which the chute ore feeding chute extends is connected to the sintered ore feeding chute It is characterized by being provided inside.

  According to the present invention, the method for feeding sinter ore to a mobile trough cooler according to claim 1 and the apparatus for feeding a sintered ore to a mobile trough cooler according to claim 2, the mobile trough type When supplying the sintered ore from the sintered ore feed chute extending obliquely with respect to the extending direction of the cooler to the mobile trough type cooler, the coarse particles separated inside the sintered ore feed chute and The fine grains are separated by a partition plate extending along the direction in which the chute for the sinter ore feed extends, thereby preventing re-mixing of the coarse grains and fine grains separated in the interior, and on the trough of the mobile trough cooler Coarse grains can be stratified in the lower layer, and fine grains can be stratified in the upper layer on the trough. And unlike the conventional sieve, the partition plate does not have a net portion or the like, so that the frequency of repairs is reduced and the repair costs are not increased.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of a feeding apparatus for a sintered trough mobile trough cooler according to an embodiment of the present invention. 2 is a cross-sectional view taken along line 2-2 of FIG.
In a feeder 1 for a sintered trough moving trough cooler shown in FIG. 1, a crusher 3 is provided below a discharge end 2 a of a sintering machine 2. Below the crusher 3, a first sinter ore chute 4 is provided. The first sinter ore feed chute 4 is inclined obliquely with respect to the direction in which the mobile trough cooler 9 extends (left and right horizontal direction in FIG. 1) (traveling direction of the trough 10 (arrow direction shown in FIG. 1)). And a vertical portion 4b extending vertically downward from the lower end of the inclined portion 4a.

A second sinter ore feed chute 5 is provided below the first sinter ore feed chute 4. The second sintered ore feed chute 5 is inclined obliquely from the lower end of the vertical portion 4b of the first sintered ore feed chute 4 with respect to the extending direction of the mobile trough cooler 9 (the trough 10). Is slanted with respect to the direction of travel). The inclination angle α of the second sintered ore feed chute 5 with respect to the extending direction of the mobile trough cooler 9 is preferably 30 ° to 60 °, and most preferably 45 °.
On the upstream side of the lower end of the second sinter ore supply chute 5, a product discharge chute 6 on the partition plate is provided, on the other hand, on the downstream side of the lower end of the second sinter ore supply chute 5. Is provided with a product discharge chute 7 under the partition plate.

  A partition plate 8 is provided inside the second sintered ore feed chute 5. The partition plate 8 is configured by a flat plate, and a vertical plate portion 8a extending vertically upward from a wall portion that partitions the product discharge chute 6 on the partition plate and the product discharge chute 7 below the partition plate, and the second sintered ore supply from the upper end thereof. The mining chute 5 is composed of an inclined portion 8b extending obliquely upward and extending, and as a whole, extends along the direction in which the second sintered ore feeding chute 5 extends. The thickness of the partition plate 8 is preferably about 30 to 100 mm, but is not limited to this range. The inclination angle θ of the partition plate 8 with respect to the extending direction of the mobile trough cooler 9 is preferably 30 ° to 60 °, and most preferably 45 °. Moreover, as shown in FIG. 2, both ends in the width direction of the partition plate 8 are fixed to opposing wall portions of the second sintered ore feed chute 5 formed in a substantially rectangular cross section. Further, the position of the partition plate 8 inside the second sintered ore feed chute 5 is located below the second sintered ore feed chute 5 from the lower surface of the partition plate 8 as shown in FIGS. When the distance from the upper surface of the partition plate 8 to the inner surface of the upper side wall of the second sintered ore feed chute 5 is b, b / a is 1/1. It is preferable to set it to ~ 2/1. Moreover, the position of the front end of the partition plate 8 is perpendicular to the line extending from the inner surface of the left wall portion of the vertical portion 4b of the first sinter ore feed chute 4 vertically and the front end of the partition plate 8 as it is. The distance l (see FIG. 1) in the direction in which the partition plate 8 extends between the line extending downward is required to be greater than 0, and on the actual machine, the distance l is preferably 5 to 6 m. .

  A mobile trough cooler 9 is provided below the product delivery chute 6 on the partition plate and the product delivery chute 7 below the partition plate. The mobile trough cooler 9 has a trough 10 that circulates a circular loop in the direction of the arrow at a speed of about 2 revolutions per hour. Similar to the cooler 109 shown in FIG. 4, the trough 10 has a bottom plate 10 a and side plates 10 c extending upward from both sides thereof. The bottom plate 10a is a ventilation plate having a large number of child holes 10b for introducing cooling air. A cooling chamber 11 is provided below the trough 10, and a hood 12 through which hot air after heat exchange passes is provided above the trough 10. A duct 13 is disposed in the hood 12, and a cooling fan 14 is provided in the duct 13.

Next, a method for supplying the sintered ore A to the mobile trough cooler 9 will be described.
The sintered ore A sintered by the sintering machine 2 is fed to the crusher 3 from the discharge end 2a. In the crusher 3, the sintered ore A is crushed to a maximum size of about 20 to 200 mm, and the crushed sintered ore A falls onto the inclined portion 4 a of the first sinter ore feed chute 4. The sintered ore A dropped on the inclined portion 4a is a first chute ore feed chute in a state where fine powder to fine particles C having a maximum dimension of about 10 mm and coarse particles B having about 10 mm to about 200 mm are mixed. 4 falls in the vertical portion 4b and reaches the chute 5 for feeding the second sintered ore. In the second sinter ore chute 5, the coarse ore B, which is easy to roll due to its weight difference, is slid down on the fine grain C that is difficult to roll. Will be divided. The coarse particles B of the sintered ore A roll to the upper side of the partition plate 8 and fall from the product discharge chute 6 on the partition plate to the upstream side on the trough 10. On the other hand, the fine particles C sink under the partition plate 8 and fall onto the coarse particles B on the trough 10 downstream from the product discharge chute 7 under the partition plate. In addition, not only the fine particles C but also the coarse particles C may be submerged in the lower side of the partition plate 8 although the amount is very small with respect to the total weight of the sintered ore A. As a result, on the trough 10 of the mobile trough cooler 9, as shown in FIG. 1, coarse particles B are formed in the lower layer, and fine particles C (which may contain very few coarse particles B) are formed in the upper layer. The

  In the second sinter ore chute 5, the sintered ore A is divided into coarse grains B and fine grains C. If the partition plate 8 is not installed, the separated coarse grains B and fine grains C are mixed again. The coarse grains B and fine grains C mixed from both the product release chute 6 on the partition plate and the product delivery chute 7 below the partition plate fall on the trough 10. For this reason, on the trough 10, the coarse grain B cannot be formed in the lower layer, and the fine grain C cannot be formed in the upper layer. On the other hand, in this embodiment, by providing the partition plate 8 extending along the extending direction of the second sintered ore feed chute 5 inside the sintered ore feed chute 5, Coarse particles B of the sinter A are rolled to the upper side of the partition plate 8 and dropped from the product discharge chute 6 on the partition plate to the upstream side of the trough 10, while the fine particles C are moved below the partition plate 8. It is made to sink into the side, and it is made to fall on the coarse grain B in the downstream on the trough 10 from the product delivery chute 7 under a partition plate, and the rough | crude separated inside the chute 5 for the 2nd sintered ore supply The mixture of grains B and fine grains C is prevented from being mixed again, and coarse grains B are contained in the lower layer on the trough 10 of the mobile trough cooler 9 and fine grains C (including very few coarse grains B are contained in the upper layer on the trough 10. In some cases).

  Here, since the partition plate 8 extends along the direction in which the second sintered ore feed chute 5 extends, the fine particles B and the coarse particles C can be effectively separated. The inclination angle θ of the partition plate 8 with respect to the extending direction of the mobile trough cooler 9 and the inclination angle α of the second sintered ore feed chute 5 with respect to the extending direction of the mobile trough cooler 9 are preferred embodiments. 30 ° to 60 °. When the inclination angle α is smaller than 30 °, the coarse particles B and the fine particles C are difficult to be separated inside the second sinter ore chute 5 and the inclination angle θ is smaller than 30 °. In addition, it is not possible to sufficiently prevent the separated coarse particles B and fine particles C from being mixed again. Moreover, even if the inclination angle α is larger than 60 °, the coarse particles B and the fine particles C are hardly separated in the second sinter ore feed chute 5, and the inclination angle θ is more than 60 °. Even if it is large, it is not possible to sufficiently prevent the separated coarse particles B and fine particles C from being mixed again. Further, as described above, the position of the partition plate 8 inside the chute 5 for supplying the second sintered ore is b / a as 1/1 to 2/1 as described above. The sintered ore A crushed by the crusher 3 is a mixture of fine powder C to fine particles C having a maximum dimension of about 10 mm and coarse particles B having a size of about 10 mm to about 200 mm. And the volume ratio tends to be larger than that of fine granules C. Therefore, the distance b from the upper surface of the partition plate 8 to the inner surface of the upper wall portion of the second sintered ore feed chute 5 is set to the lower wall portion of the second sintered ore feed chute 4 from the lower surface of the partition plate 8. It is preferable that b / a is set to 1/1 to 2/1 by being equal to or larger than the distance a to the inner surface. Moreover, the position of the front end of the partition plate 8 is directly perpendicular to the line extending from the inner surface of the left wall portion of the vertical portion 4a of the first sinter ore feed chute 4 vertically and the front end of the partition plate 8. The distance l between the line extending downward and the extending direction of the partition plate 8 is set to be larger than zero. When the distance l is equal to or less than 0, the group of sintered ores A is partitioned by the partition plate 8 before the coarse particles B are layered on the fine particles C in the second sintered ore feed chute 5. Therefore, the effect of separating the coarse particles B and the fine particles C cannot be expected sufficiently.

Further, the partition plate 8 is constituted by a substantially rectangular flat plate, and unlike the conventional sieve, there is no mesh portion, so that the frequency of repair is reduced and the repair cost is not increased.
In the mobile trough cooler 9, cooling air is sent from the cooling chamber 11 from below the trough 10, passes through the sub-hole 10 b formed in the bottom plate 10 a of the trough 10, and the high-temperature coarse particles B, Heat is exchanged with the fine particles C one after another and becomes hot air, passes through the hood 12 and the duct 13 and reaches the cooling fan 14. In this process, the coarse particles B and fine particles C supplied to the trough 10 are cooled from about 600 ° C. to 800 ° C. to 150 ° C. or less. The cooled coarse particles B and fine particles C are conveyed by a belt conveyor (not shown).
As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various change and improvement can be performed.
For example, as a sintered ore feed chute provided below the discharge end 2a of the sintering machine 2, only the second sintered ore feed chute 5 is provided, and the first sintered ore feed chute 4 is provided. May be omitted.
In addition, the crusher 3 may be omitted when the sintered ore has a maximum particle size of 10 mm to 200 mm.

Crushed calcination using the mining apparatus 1 of the present invention example shown in FIG. 1 and the comparative mining apparatus with the partition plate 8 removed from the mining apparatus 1 of the present invention example shown in FIG. The ore A was fed to the mobile trough cooler 9. At this time, the sintered ore falling on the trough 10 from the product delivery chute 7 under the partition plate is passed through a sieve having a square 10 mm mesh, and the weight of the coarse particles remaining on the 10 mm mesh is the product delivery chute 7 under the partition plate. It was measured how much of the sintered ore falling on the trough 10 shows the proportion of the total weight.
The measurement results are shown in Table 1.

Referring to Table 1, in the comparative example, the ratio of the weight of the coarse particles remaining after being caught by the square 10 mm mesh is 40%, whereas in the present invention example, the coarse particles remaining by being caught by the square 10 mm mesh. The ratio of the weight of the grains is 10%, and it can be seen that the ratio of the fine grains falling on the trough 10 from the under-partition product discharge chute 7 is larger in the example of the present invention.
For this reason, in the example of the present invention, coarse particles are layered on the lower layer on the trough 10 of the mobile trough cooler 9, and fine particles containing very few coarse particles on the upper layer on the trough 10 as compared with the comparative example. Can be stratified.

It is explanatory drawing of the ore supply apparatus to the mobile trough type | mold cooling machine of the sintered ore which concerns on embodiment of this invention. It is sectional drawing which follows the 2-2 line of FIG. It is explanatory drawing of the whole structure of the sintering apparatus of a prior art example. It is a principal part cross-sectional perspective view of the cooler in FIG. It is explanatory drawing of the mineral supply apparatus of a prior art example. It is explanatory drawing of the conventional mineral supply apparatus of another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feeding apparatus to the moving trough type cooler of sintered ore 2 Sintering machine 2a Exhaust end 3 Crusher 4 Chute for 1st sintered ore feed 4a Inclined part 4b Vertical part 5 Second sintered ore feed Chute 6 product discharge chute on partition plate 7 product discharge chute below partition plate 8 partition plate 9 mobile trough cooler 10 trough 10a bottom plate 10b child hole 10c side wall 11 cooling chamber 12 hood 13 duct 14 cooling fan

Claims (2)

  A sintered ore feed chute is provided below the discharge end of the sintering machine, a moving trough cooler is provided below the sintered ore feed chute, and the sintered ore feed chute is When the sinter is supplied to the mobile trough chiller from the sinter for supplying sinter ore, the sinter ore supply is inclined obliquely with respect to the extending direction of the mobile trough chiller. A coarse plate is provided in the lower layer on the trough of the mobile trough cooler, and the upper layer on the trough is provided using a partition plate provided in the inside of the chute for the sintered ore and extending along the extending direction of the chute for supplying the sintered ore. A method of feeding a sintered ore to a mobile trough cooler, characterized by laminating fine grains.   A sintered ore feed chute is provided below the discharge end of the sintering machine, a moving trough cooler is provided below the sintered ore feed chute, and the sintered ore feed chute is , An apparatus that feeds sintered ore from the sinter ore feed chute to the mobile trough cooler inclined obliquely with respect to the direction in which the mobile trough cooler extends, A feeding apparatus for a moving trough type cooler for sintered ore, characterized in that a partition plate extending along a direction in which the feeding chute extends is provided inside the sintered ore feeding chute.

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