JP7047263B2 - Sintered raw material charging device and sintered raw material charging method - Google Patents

Description

The present invention relates to an apparatus for charging sinter raw material grains into a pallet of a DL type sinter, and a sinter raw material grain to be granulated by blending a raw material for obtaining sinter. It is about the charging method.

Iron raw materials used in blast furnaces include mined iron ore lump ore and sinter obtained by calcining powder ore. Sintered ore can be obtained, for example, by calcining iron ore powder ore together with limestone, powdered coke and the like.

In producing this sinter, generally, first, various brands of sinter, auxiliary raw materials such as limestone, and carbonaceous materials such as powdered coke as a solid fuel are mixed in a predetermined ratio. Water is added to produce sintered raw material granulated into pseudo particles, and the sintered raw material is charged into the pallet of a DL (dwightroid) type sintering machine that continuously moves in the horizontal direction. By igniting the upper layer of the sintered raw material particles charged in the pallet with a burner or the like, sintering is performed while sucking from below the pallet and forcibly ventilating. Therefore, in order to improve the firing rate (reaction rate) and the sintering yield, the grain size of the sintered raw material grains charged in the pallet is coarser in the lower layer portion than in the upper layer portion in consideration of air permeability. It is necessary to do so. Further, it is desirable that the sintered raw material grains in the pallet are charged (filled) at a low density for the purpose of preventing the sintered raw material grains from being crushed and ensuring air permeability.

Therefore, the sintered raw material particles contained in the hopper or the like are dropped while being cut out by a drum feeder, and slid on a packed chute having an inclined surface inclined in the horizontal direction to be loaded into the pallet. There is a method of forming particle size segregation in the packed bed of the raw material in the pallet of the sintered raw material grains charged by the segregation effect when rolling down the slope of the mountain called.

Then, when the sintered raw material particles are charged into the pallet as described above, for example, the inclination angle of the charging chute is set to 45 to 48 degrees, and the traveling speed of the pallet is set to 2.5 to 3.5 m /. A method has been proposed in which the particle size segregation is provided so that the particle size of the sintered raw material grains charged in the pallet continuously changes in the layer height direction by controlling within the minute range (see Patent Document 1).

In addition, the sintered raw material grains are charged into the pallet while blowing high-speed air (in the direction opposite to the sliding direction) against the flow of the sintered raw material grains sliding on the charging chute on the outlet side of the charging chute. Such a method has also been proposed (see Patent Document 2). According to this method, the speed at which the sintered raw material grains are charged into the pallet is reduced, so that the bulk density of the raw material packed bed is lowered, and the sintered raw material grains having a small specific gravity are the upper layer portion of the raw material packed layer. It is said that more appropriate particle size segregation can be obtained because it is easy to be charged into the bed.

Japanese Unexamined Patent Publication No. 7-41871 Japanese Unexamined Patent Publication No. 10-281652

In producing sinter, in order to improve productivity and obtain good quality sinter, relatively coarse sinter raw material grains are charged into the lower layer of the pallet, and relatively fine sinter is baked. It is necessary to sinter the raw material grains so that they are charged into the upper layer of the pallet. Although various studies have been made, it has become difficult to sufficiently segregate the particle size in the raw material packing layer by the conventional method due to the recent demand for raw materials and production conditions. In particular, when targeting existing equipment, adjustments and settings are limited because there are restrictions on the layout of various devices and space constraints.

Under such circumstances, the present inventors focused on the gliding speed of the sintered raw material grains on the charging chute. For example, as described in Patent Document 2 above, the speed of the sintered raw material grains charged from the charging chute into the pallet of the DL type sintering machine is reduced, and the classification action on the charging chute is considered. That is also one way of thinking. However, as a result of a new study, contrary to the conventional way of thinking, it is better to increase the sliding speed of the sintered raw material grains on the charged chute set to a predetermined inclination angle, which is more appropriate for the raw material packed bed. We have obtained the finding that segregation can be achieved.

Therefore, it is an accelerator that adds the initial speed in the sliding direction at the entrance of the charging chute of the sintered raw material grains supplied to the charging chute from the drum feeder or the like, or the gliding force is applied to the sintered raw material grains on the charging chute. The present invention has been completed by finding that the charging device provided with the accelerating device to be added makes it possible to strengthen the grain size segregation of the raw material packing layer while being excellent in productivity.

Therefore, an object of the present invention is the loading of sinter raw material grains, which can produce sinter with excellent productivity while allowing the sinter raw material grains to be ideally arranged as a raw material filling layer in the pallet. It is to provide an entry device.

Another object of the present invention is that the sinter raw material grains can be produced with excellent productivity while the sinter raw material grains are ideally arranged as the raw material filling layer in the pallet. Is to provide a method of charging.

That is, the gist of the present invention is as follows.
(1) Sintered raw material granulated by blending a raw material for obtaining sinter is supplied to the entrance of a charging chute having an inclined surface inclined at a predetermined inclination angle with respect to the horizontal direction, and the exit thereof . By charging the sintered raw material grains into the pallet of the DL type sintering machine that slides up to and moves continuously in the horizontal direction from the outlet side of the charging chute, the raw material filling layer including the lower layer part to the upper layer part is included. It is a charging device for sintered raw material grains that form
The charging chute charges the sintered raw material grains along the longitudinal direction of the pallet and also charges the sintered raw material grains in the direction opposite to the traveling direction of the pallet. Provided with an accelerator that adds an initial velocity in the sliding direction of the sintered raw material grains at the entrance of the chute, and / or an accelerator that adds a sliding force in the sliding direction to the sintered raw material grains on the charged chute. A device for charging sintered raw material grains.
(2) The accelerating device is a curved chute having a curved falling surface and arranged on the entrance side of the charging chute, and is a sintered raw material grain cut out from a drum feeder and dropped in the vertical direction. The charging device for sintered raw material grains according to (1), which is received by the curved chute and supplied to the charging chute to add an initial velocity to the sintered raw material grains at the inlet of the charging chute.
(3) The accelerator is a belt feeder in which an endless belt is erected on a pair of drive rollers and is arranged on the entrance side of the charging chute. Sintering that is cut out from the drum feeder and dropped in the vertical direction. The device for charging a sintered raw material grain according to (1), wherein the raw material grain is received by the belt feeder and supplied to the charging chute to add an initial velocity to the sintered raw material grain at the inlet of the charging chute.
(4) The accelerator is a smooth inclined plate having a smooth inclined surface having a friction coefficient smaller than that of the inclined surface of the charging chute and is arranged on the entrance side of the charging chute, and is cut out from a drum feeder. The sintering according to (1), wherein the sintered raw material grains that have fallen in the vertical direction are received by the smooth inclined plate and supplied to the charging chute, and the initial velocity is added to the sintered raw material grains at the inlet of the charging chute. Raw material grain charging device.
(5) The accelerator is a drum feeder that cuts out and supplies sintered raw material grains along the inclined surface of the charging chute, and arranges the inlet side of the charging chute at the cutting port of the drum feeder. The device for charging the sintered raw material grains according to (1), which adds an initial velocity to the sintered raw material grains at the inlet of the charging chute.
(6) The accelerator is a gas spraying device that flows gas from the inlet side to the outlet side of the charging chute, and the sintered raw material particles on the charging chute have a sliding force due to the gas flow. The device for charging the sintered raw material grains according to (1) to be added.
(7) Sintered raw material granulated by blending a raw material for obtaining sinter is supplied to the entrance of a charging chute having an inclined surface inclined at a predetermined inclination angle with respect to the horizontal direction, and the exit thereof . By charging the sintered raw material grains into the pallet of the DL type sintering machine that slides up to and moves continuously in the horizontal direction from the outlet side of the charging chute, the raw material filling layer including the lower layer part to the upper layer part is included. It is a method of charging the sintered raw material grains that form
The charging chute charges the sintered raw material grains along the longitudinal direction of the pallet and also charges the sintered raw material grains in the direction opposite to the traveling direction of the pallet. An accelerator for adding the initial velocity of the sintered raw material grains at the entrance of the chute in the sliding direction and / or an accelerating device for adding the sliding force in the sliding direction to the sintered raw material grains on the charged chute are provided. , The sliding speed v _{1'of the sintered raw material grains gliding on the charging chute should be faster than the sliding speed v 1 of} the sintered raw material grains sliding on the charging chute without an accelerator. A method for charging sintered raw material grains, which is characterized by the fact that it is used.

According to the present invention, the particle size segregation of the raw material packed bed in the pallet can be efficiently enhanced. Therefore, it is possible to meet the demand for increased productivity in recent years, and while being excellent in productivity, it is possible to arrange sinter raw material grains by providing appropriate grain size segregation in the raw material packing layer in the pallet, and when obtaining sinter. It becomes possible to improve the firing speed and the sintering yield.

In particular, the charging device of the present invention employs a relatively simple means, and is not easily restricted by the convenience of space and the arrangement of other devices. Therefore, the present invention can be easily applied not only to a new facility but also to an existing facility.

FIG. 1 is a schematic explanatory view showing a test apparatus used for the test performed in the present invention. 2A and 2B explain the test chute used for the test apparatus of FIG. 1, where FIG. 2A is a front explanatory view and FIG. 2B is a side explanatory view. FIG. 3 is a schematic explanatory view showing a method for evaluating the particle size segregation of the raw material sedimentation pile obtained by using the test apparatus of FIG. FIG. 4 is a graph showing the results of evaluating the particle size segregation of the raw material deposits obtained by using the test apparatus of FIG. 1. FIG. 5 is a schematic explanatory view showing an example of an accelerator in the charging device of the present invention. FIG. 6 is a schematic explanatory view showing an example of another accelerator in the charging device of the present invention. FIG. 7 is a schematic explanatory view showing an example of another accelerator in the charging device of the present invention. FIG. 8 is a schematic explanatory view showing an example of another accelerator in the charging device of the present invention. FIG. 9 is a schematic explanatory view showing an example of another accelerator in the charging device of the present invention. FIG. 10 is a schematic explanatory view showing an example of another accelerator in the charging device of the present invention. FIG. 11 shows No. 11 used in the experimental example of the present invention. It is a schematic explanatory drawing which shows 1 experimental charging apparatus.

Hereinafter, the present invention will be described in detail.
The sinter raw material charging device in the present invention supplies the sintered raw material grains granulated by blending the raw material for obtaining the sinter to a charging chute having an inclined surface and slides the sinter raw material grains in the horizontal direction. When charging into the pallet of the DL type sintering machine that continuously moves to, the sintered raw material grains are charged along the longitudinal direction of the pallet, and the sintered raw material grains are charged in the direction opposite to the traveling direction of the pallet. Acceleration device that adds the initial speed in the sliding direction of the sintered raw material grains at the entrance of the charging chute, or acceleration that adds the sliding force in the sliding direction to the sintered raw material grains on the charging chute. It is a device or a combination of these accelerators.

As described above, an accelerator for adding an initial velocity in the sliding direction of the sintered raw material grains at the entrance of the charging chute is provided, and / or the sliding force in the sliding direction is provided to the sintered raw material grains on the charging chute. By providing _an accelerator to add the It can be made faster than the speed _v1 . As mentioned above, the findings that increasing the sliding speed of the sintered raw material grains on the charged chute will result in appropriate particle size segregation by the raw material packed bed in the pallet are shown in the test results below. It is based on.

FIG. 1 shows the equipment used in the test. This test device has a test hopper 1 for accommodating the sintered raw material grains and a test chute 2 for sliding the sintered raw material grains, and when the gate 1a provided in the test hopper 1 is opened, the sintered raw material grains become the test chute 2. The sintered raw material grains that have been supplied and slid on the test chute 2 fall onto the floor surface 3 to form a raw material deposit pile 4 on which the sintered raw material grains are deposited. Here, the test hopper 1 is tilted at the entrance side of the test chute 2 at an angle of θ ₁ = 60 ° with respect to the horizontal plane, and the test chute 2 is tilted at an angle of θ ₂ = 40 ° with respect to the horizontal plane. It is fixed, and the outlet side of the test chute 2 is adjusted to a height H ₁ = 460 mm from the floor surface 3. Further, as shown in FIG. 2, in this test chute 2, side wall plates 2b are provided on both sides of the bottom plate 2a, and the sliding sintered raw material grains have a width L ₁ = 13 cm partitioned by these side wall plates 2b. The shoot space having a height H ₂ = 10 cm is moved by the length L ₂ = 500 cm of the bottom plate 2a and falls to the floor surface 3 to form a raw material deposit pile 4.

Then, using the test apparatus shown in FIG. 1, the opening degree of the gate 1a in the test hopper 1 is set in three stages of height 30 mm (test 1), height 50 mm (test 2), and height 90 mm (test 3). 20 kg of sintered raw material grains were supplied from the test hopper 1 and the test chute 2 was slid, and the raw material deposit pile 4 obtained by dropping onto the floor surface was evaluated.
First, as shown in FIG. 3, the raw material deposit pile 4 obtained in each test is divided into four parts <1> to <4> in the length direction along the falling direction of the sintered raw material grains, and the portion thereof is divided into four parts. At that time, the mass ratio w to the total mass of the sintered raw material grains was calculated from the mass of each part so that the masses of the sintered raw material grains at each part were substantially the same. Further, the sintered raw material grains in each part are classified by a sieve having a mesh size of 2 mm, 4 mm, and 8 mm, and the average particle size of the parts of <1> to <4> is obtained, and the parts of <1> to <4> are obtained. The value obtained by dividing the average particle size of each by the average particle size of the whole was obtained and made dimensionless.

Here, in an actual sintering machine, while the pallet of the DL type sintering machine moves at a predetermined traveling speed, the sintered raw material grains are continuously charged, so that the raw material deposit pile as described above is used. Instead, a raw material packed bed filled in the pallet in the height direction is obtained. Therefore, for the raw material deposits 4 obtained in Tests 1 to 3, assuming a raw material filling layer having a layer thickness of 550 mm in the actual machine, among the parts <1> to <4> of the raw material deposits 4, FIG. 3 shows the portion <1> where the sintered raw material grains that have fallen farthest from the test chute 2 are deposited on the lower layer side, and the portion <4> of the sintered raw material grains that have fallen closest to the test chute 2 as the upper layer side. As shown in, the height ha of each part is calculated based on the mass ratio w of each part of <1> to <4>, and the position hb of the lower end of each part of <1> to <4> is calculated. Calculated. That is, as shown below, for example, the height ha1 of the part of <1> corresponds to the position hb2 of the lower end of the part of <2>. Then, assuming that the height at the center of each part is the height h from the floor surface 3, the height of each part is obtained as follows. In this way, the raw material deposits 4 obtained in each test were modified to have a vertical (height direction) distribution, and a graph showing the relationship between the dimensionless average particle size and the height position (h) was created. The results are shown in FIG.
(Position hb at the bottom of each part)
hb1 = 0
hb2 = ha1
hb3 = ha1 + ha2
hb4 = ha1 + ha2 + ha3
(Height h from the floor of each part)
h1 = (ha1) / 2
h2 = hb2 + (ha2) / 2
h3 = hb3 + (ha3) / 2
h4 = hb4 + (ha4) / 2

In FIG. 4, the height (center position) h of each part obtained as described above is set as the vertical axis, and the average particle size (MS) of the parts <1> to <4> is the average of the entire sintered raw material grains. The horizontal axis is the value divided by the particle size (MS), and the degree of particle size segregation can be compared for the raw material deposition piles 4 in tests 1 to 3 in which the opening degree of the gate 1a of the test hopper 1 is changed. can. According to this, in the raw material deposit pile 4 of Test 1, the particle size segregation in which the grain size of the sintered raw material grain becomes coarser is most strengthened in the lower layer part than in the upper layer part, and it can be seen that it is more suitable as a raw material packed bed. ..

Here, if the flow rate of the sintered raw material grains in each test is expressed in terms of the raw material supply amount (ton / hour) per length in the width direction of the test chute 2 (per chute space width), the opening degree of the gate 1a is The smallest test 1 is 34.6 t / h / m, the test 2 is 100.4 t / h / m, and the test 3 with the largest opening of the gate 1a is 150.5 t / h / m. It can be seen that it is better to reduce the flow rate per unit width (t / h / m) on the chute. Further, in this test, the inclination angle of the test chute 2 is fixed, and the sliding speed (flowing speed) of the sintered raw material grains is constant in each test, so that the flow rate per unit width (t / h / m). Affects the layer thickness (thickness of the sintered raw material layer) of the sintered raw material grains gliding on the test chute 2. Therefore, in actual manufacturing, the sintered raw material grains are charged into the pallet of the DL type sintering machine without reducing the supply amount of the sintered raw material grains cut out by a drum feeder or the like so as not to reduce the productivity. If the sliding speed of the sintered raw material grains on the chute can be increased, the sintered raw material grains can be arranged by providing an appropriate grain size segregation in the raw material packing layer in the pallet.

Therefore, in the present invention, the pallet of the DL type sintering machine is provided with an accelerator for adding the initial speed in the sliding direction of the sintered raw material grains at the entrance of the charging chute for charging the sintered raw material grains to increase the initial speed. An accelerator is provided to increase the sliding speed of the sintered raw material grains on the charging chute and to add a sliding force in the sliding direction to the sintered raw material grains on the charging chute. The sintered raw material grains are charged into the pallet of the DL type sintering machine so as to increase the sliding speed of the sintered raw material grains. That is, in the present invention, the sliding speed of the sintered raw material grains supplied to the pallet is made as fast as possible. As shown in FIGS. 5 to 10 described later (reference numeral 17), this pallet is usually in the horizontal direction opposite to the sliding direction (falling direction) of the sintered raw material grains on the outlet side of the charging chute. (Arrow in the figure), the charging chute for increasing the sliding speed of the sintered raw material grains in the present invention is for charging the sintered raw material grains along the longitudinal direction of the continuously moving pallet. Moreover, it can be said that it is a charging chute that supplies sintered raw material grains in the direction opposite to the traveling direction (moving direction) of the pallet. Suitable examples of such an accelerator include the following.

That is, as shown in FIG. 5, the curved chute 9 having a curved falling surface 9a and arranged on the inlet side of the charging chute 7 and the pair of drive rollers 10 shown in FIG. 6 have an endless belt. In addition to the belt feeder 12 on which 11 is erected and arranged on the entrance side of the charging chute 7, as shown in FIG. 7, a smooth inclined surface 13a having a smaller friction coefficient than the inclined surface 7a of the charging chute 7 is provided. The smooth inclined plate 13 disposed on the entrance side of the charging chute and the charging chute tilted at an inclination angle θ'greater than the inclination angle θ of the charging chute 7 shown in FIG. The approach inclined plate 14 and the like arranged on the entrance side of the above can be exemplified.

In each of these accelerators (9, 12, 13, 14) shown in FIGS. 5 to 8, the sintered raw material grains 8 contained in the hopper 5 are cut out by the drum feeder 6 and once dropped in the vertical direction. This is an example of an accelerator that is supplied to the charging chute 7 to add an initial velocity in the sliding direction of the sintered raw material grain 8 at the entrance of the charging chute 7. Of these, in the curved chute 9 shown in FIG. 5, the impact is suppressed by catching the sintered raw material grains 8 cut out by the drum feeder 6 and dropped by the curved falling surface 9a of the curved chute 9, so that the curved chute 9 is used. The sintered raw material grain 8 can be supplied to the charging chute inlet side in an accelerated state. Further, in the belt feeder 12 shown in FIG. 6, the sintered raw material grains 8 dropped from the drum feeder are received by the endless belt 11 rotating in the sliding direction, so that the conveying force of the endless belt 11 and the endless belt can be applied. Since the sliding speed of the above is imparted, the sintered raw material grains 8 can be supplied to the charging chute inlet side in an accelerated state via the belt feeder 12. Further, the sliding speed is also imparted through the smooth inclined plate 13 shown in FIG. 7 and the approach inclined plate 14 shown in FIG. 8, and the sintered raw material grains 8 are charged into the chute entrance side in an accelerated state. Can be supplied to.

On the other hand, the drum feeder can also be used as an accelerator for adding the initial velocity of the sintered raw material grains in the sliding direction. That is, as shown in FIGS. 5 to 8, the sintered raw material 8 contained in the hopper 5 is not cut out by the drum feeder 6 and dropped in the vertical direction, but as shown in FIG. 9, the drum feeder 6 is used. The inlet side of the charging chute 7 is aligned with the cutting port of the charging chute 7, and the sintered raw material grains 8 are cut out and supplied along the inclined surface of the charging chute 7 so as to be supplied at the charging chute entrance. The initial velocity may be added to the sintered raw material grains.

Further, as the accelerator according to the present invention, a gas spraying device capable of adding a sliding force to the sintered raw material particles on the charging chute by the flow of gas to increase the sliding speed of the sintered raw material particles is used. You may do so. Above all, preferably, as shown in FIG. 10, a gas spraying device capable of flowing the gas 16 along the sliding direction of the sintered raw material grains 8 from the inlet side to the outlet side of the charging chute 7. In the case of such a gas spraying device 15, a sliding force is applied from the entrance side of the charging chute 7 to increase the initial velocity of the sintered raw material grains 8. At that time, a plurality of gas spraying devices of the same type may be installed along the width of the charging chute 7 so that a uniform flow velocity can be obtained in the width direction of the charging chute 7. Further, the gas spraying device is not particularly limited, but it is preferable that it can eject a high-speed air flow, and preferably, a plurality of ejection nozzles (not shown) are provided in the height direction to obtain sintered raw material grains. It is preferable that high-speed air can be ejected along the sliding direction of 8.

In the present invention, two or more accelerators as shown in FIGS. 5 to 10 may be combined to form a sintering raw material grain charging device. In FIGS. 5 to 10, the flow of the sintered raw material grains 8 cut out by the drum feeder 2 is shown by an arrow line, and the sintered raw material grains 8 are represented as one particle. In reality, a predetermined amount of the sintered raw material particles 8 are supplied, and the charging chute 7 or the like forms a sintered raw material layer composed of a large number of sintered raw material grains and slides.

A charging device equipped with an accelerator such as these can efficiently enhance the particle size segregation of the raw material packed bed in the pallet. For example, the supply amount of sintered raw material grains cut out by a drum feeder can be increased. Sintered raw material grains can be charged by providing an appropriate particle size segregation in the raw material packed bed in the pallet without dropping, and it is possible to meet the demand for increased productivity in recent years. Further, the charging device of the present invention employs a relatively simple means and is not easily restricted by space and the arrangement of other devices. Therefore, of course, when constructing a new facility. That is, the present invention can be applied to existing equipment. For example, even if it is difficult to drastically change the tilt angle or change the length or height of the existing charging chute, by providing an accelerator as in the present invention, the particle size segregation can be strengthened. Become.

The other equipment in the charging device of the present invention is not particularly limited, and the same equipment as known ones can be used. For example, the drum feeder can be used together with a hopper or the like for accommodating the sintered raw material grains, and the charging chute is provided with side walls for partitioning on both sides along the sliding direction of the sintered raw material grains and is partitioned by the wall surface. It suffices to allow the sintered raw material grains to slide in the shoot space having a predetermined width, and there are no particular restrictions on the material or the like. The same applies to the pallet for charging the sintered raw material grains, and the pallet of a known DL-type sintering machine that moves at a predetermined traveling speed can be used as it is. Further, a classification device may be provided on the outlet side of the charging chute to classify the sintered raw material grains before being supplied to the pallet. As such a classification device, for example, a plurality of rods having gaps formed with each other are arranged in the sliding direction of the sintered raw material grains or in a direction orthogonal to the sliding direction of the sintered raw material grains, and the gaps on the pallet side are arranged respectively. A classifier having a slit that is wider than the gap on the outlet side of the charging chute can be mentioned.

Further, the sintered raw material grains charged by the charging device of the present invention are not particularly limited, and the raw materials, the mixing ratio and the like can be the same as those known. For example, as raw materials, in addition to various brands of powder ore and return ore, auxiliary materials such as limestone, quicklime, steel slag, dolomite, and scale, and carbonaceous materials (solid fuel) such as powdered coke and coal are added with water. It may be mixed. Further, when these are used as sintered raw material grains, they may be granulated by using a drum mixer, a pan pelletizer, or the like under the same treatment conditions as before. Then, the sinter raw material grains charged into the pallet by the charging device of the present invention can be sintered by a known method using a DL type sinter to produce a sinter.

Hereinafter, examples of the present invention will be described based on experimental examples, but the present invention is not limited to these contents.

(Experimental example)
A hopper 5 into which the sintered raw material grains 8 are charged, a drum feeder 6 provided in the hopper 5 for cutting out the sintered raw material grains 8, and a charging chute for sliding the sintered raw material grains 8 supplied from the drum feeder 6. Six types of experimental charging devices (No. 1 to 6) equipped with 7 and a sintering experimental pot provided on the outlet side of the charging chute 7 to charge the sintering raw material grains 8 were prepared. .. Of these, FIG. 11 shows No. 1 used as a reference in this experiment. No. 1 experimental charging device is shown, and while this charging device is not provided with an accelerator, No. The experimental charging devices 2 to 6 are provided with an accelerator as described later.

The hopper 5, the drum feeder 6, and the charging chute 7 in these experimental charging devices are configured by using common ones, and the inclination angle θ of the charging chute 7 with respect to the horizontal direction is set to 50 °. Further, the charging chute 7 is provided with side wall plates (not shown) on both sides of a bottom plate having an inclined surface made of stainless steel, and the sintered raw material grain 8 has a width (L ₁ ) of 500 mm partitioned by these side wall plates. Move (slide) the shoot space with a height (H ₂ ) of 100 mm by the length of the bottom plate (L ₂ : see Fig. 2) by 500 mm, and the height on the exit side of the charging chute 7 (H). : See FIG. 11) It fell from 460 mm so that the raw material deposit pile 4 was formed on the floor surface 3.

Here, No. In the experimental charging device No. 2, as shown in FIG. 10, a gas spraying device 15 for flowing gas from the inlet side to the outlet side of the charging chute 7 was used. The gas blowing device 15 is provided with a plurality of ejection nozzles (not shown) so as to eject air having a flow velocity of 10 m / s to the sintered raw material particles 8 on the charging chute 7. In addition, No. In the experimental charging device of No. 3, the belt feeder 12 was used as shown in FIG. The belt feeder 12 is installed at an inclination angle θ = 50 ° with respect to the horizontal direction, drives the endless belt 11 in the sliding direction of the sintered raw material grains 8 at a belt speed of 10 m / s, and is mounted on the endless belt 11. The sliding distance of the sintered raw material grain 8 was set to 300 mm. In addition, No. In the experimental charging device of No. 4, a curved chute 9 is used as shown in FIG. 5, and the curved chute 9 curves in an arc shape toward the entrance side of the charging chute 7 with a radius of curvature R = 1 m. It has a falling surface 9a. Furthermore, No. In the experimental charging device No. 5, a smooth inclined plate 13 is used as shown in FIG. 7, and the smooth inclined plate 13 is provided with a smooth inclined surface 13a (coefficient of friction with respect to sintered raw material grains 0.4) made of silicon nitride. The friction coefficient was made smaller than the inclined surface of the charging chute 7 (friction coefficient 0.5 with respect to the sintered raw material grains) so that the sliding distance on the smooth inclined plate 13 was 300 mm. Furthermore, No. In the experimental charging device No. 6, as shown in FIG. 9, the entrance side of the charging chute 7 is aligned with the cutout port of the drum feeder 6, and the sintered raw material is arranged along the inclined surface of the charging chute 7. The grain 8 was cut out and supplied (the inclination angle θ of the charging chute and the height H on the outlet side are the same as those of other charging devices).

The above No. Using the experimental charging devices 1 to 6, about 100 kg of each sintered raw material grain was charged into the hopper 5, and No. In the experimental charging devices 1 and 2, the sintered raw material grains 8 cut out by the drum feeder 6 and vertically dropped were directly supplied to the charging chute 7. In the experimental charging devices 3 to 5, the sintered raw material grains 8 were supplied to the charging chute 7 via the respective accelerators, and No. In the experimental charging device of No. 6, the sintered raw material grains 8 were supplied directly from the drum feeder 6 to the charging chute 7 without dropping. At that time, the sliding distance of the sintered raw material 8 on the charging chute 7 is about 550 mm in any of the experimental charging devices, and the raw material supply amount per the width of the chute space of the charging chute 7 is 150 t / h / m. Is. Further, it took about 3 to 4 seconds for all the sintered raw material grains 8 cut out from the drum feeder 6 to fall on the floor surface 3 and to form the raw material deposit pile 4. In this experimental example, the raw materials shown in Table 1 are mixed with water, and sintered raw material grains that have been granulated using a drum mixer are used, and the average particle size thereof is about 4 mm.

Regarding the raw material accumulation pile 4 of the sintered raw material grains 8 deposited on the floor surface 3 by the experiment using each charging device, the method described in FIG. 3 above is followed, and here, along the falling direction of the sintered raw material grains 8. It was divided into 6 parts from <1> to <6> in the length direction. Next, after the sintered raw material grains 8 of each part are reduced, the part of <1> where the sintered raw material grains 8 that have fallen farthest from the charging chute 7 are deposited is placed on the lower layer side, and the most. Approximately 60 kg of the sintered raw material grain 8 was loaded into the sintering experiment pot so that the portion <6> of the sintered raw material grain 8 that had fallen nearby was on the upper layer side. The sintering experiment pot used has a cylindrical shape with an inner diameter of φ300 mm and a height of 600 mm with an open upper portion, and a plurality of suction holes for sucking air from the outside are provided on the bottom surface.

Then, for each experiment, a firing test was conducted in which the sintered raw material grains 8 charged in the sintering experiment pot were fired as follows. That is, an ignition burner is prepared on the upper opening side of the sintering experiment pot, and the surface layer of the raw material filling layer composed of the sintered raw material grains 8 charged in the sintering experiment pot is heated with the ignition burner for 60 seconds at the same time as the start of the test. After ignition, the air in the sintering experiment pot was sucked from the bottom side of the sintering experiment pot at a constant pressure of 1200 mmAq to promote the reaction.

By the way, in the sintering process, when the reaction reaches the lowest layer of the packed bed of raw materials, the exhaust gas temperature becomes the highest. Therefore, a thermocouple was installed at the bottom of the sintering experiment pot, and the time when the exhaust gas temperature was measured and reached the maximum was set as the sintering completion time, and the thickness of the raw material filling layer (600 mm) / sintering was completed. The firing rate (mm / s) was calculated from the time (s). Further, after the firing of the entire packed bed of the raw material is completed, the calcined body obtained after waiting for cooling is taken out from the sintering experiment pot, and the calcined body is taken out in a lump state with a square sieve having a diameter of 5 mm. The class was classified, and the product yield of + 5 mm was obtained by using the sieve as the product sinter. Further, the yield × firing rate obtained above was calculated, and No. The value when the experimental charging device of 1 was used was set to 1, and the yield × firing rate in each experimental charging device was shown as a relative value to evaluate the productivity. These results are summarized in Table 2.

As can be seen from the firing test results shown in Table 2, the firing rate and sinter yield of the sinter are improved by using the charging device equipped with the accelerator according to the present invention. It is considered that the sintered raw material grains could be charged by providing an appropriate particle size segregation in the raw material packed bed in the above. Therefore, according to the present invention, the particle size segregation of the raw material packed bed in the pallet can be efficiently strengthened, and the sinter can be produced while being excellent in productivity.

1: Test hopper, 1a: Gate, 2: Test chute, 2a: Bottom plate, 2b: Side wall plate, 3: Floor surface, 4: Raw material deposit pile, 5: Hopper, 6: Drum feeder, 7: Charge chute, 8 : Sintered raw material grain, 9: curved chute, 9a: curved falling surface, 10: drive roller, 11: endless belt, 12: belt feeder, 13: smooth inclined plate, 13a: smooth inclined surface, 14: approach inclined plate, 15: Gas sprayer, 16: Gas, 17: Pallet.

Claims (4)

Sintered raw material granulated by blending the raw material for obtaining sinter is supplied to the entrance of the charging chute having an inclined surface inclined at a predetermined inclination angle with respect to the horizontal direction and slid to the exit. Then, by charging the sintered raw material grains into the pallet of the DL type sintering machine that continuously moves in the horizontal direction from the outlet side of the charging chute, a raw material filling layer including the lower layer portion to the upper layer portion is formed. It is a charging device for sintered raw material grains.
The charging chute charges the sintered raw material grains along the longitudinal direction of the pallet and also charges the sintered raw material grains in the direction opposite to the traveling direction of the pallet. It is provided with an accelerator that adds an initial velocity in the sliding direction of the sintered raw material grains at the entrance of the chute, and / or an accelerator that adds a sliding force in the sliding direction to the sintered raw material grains on the charged chute. Ori,
The accelerator is a drum feeder that cuts out and supplies sintered raw material grains along the inclined surface of the charging chute, and is arranged so that the inlet side of the charging chute is aligned with the cutting port of the drum feeder. A device for charging sintered raw material grains, which is characterized by adding an initial velocity to the sintered raw material grains at the entrance of the charging chute . Sintered raw material granulated by blending the raw material for obtaining sinter is supplied to the entrance of the charging chute having an inclined surface inclined at a predetermined inclination angle with respect to the horizontal direction and slid to the exit. Then, by charging the sintered raw material grains into the pallet of the DL type sintering machine that continuously moves in the horizontal direction from the outlet side of the charging chute, a raw material filling layer including the lower layer portion to the upper layer portion is formed. It is a charging device for sintered raw material grains.
The charging chute charges the sintered raw material grains along the longitudinal direction of the pallet and also charges the sintered raw material grains in the direction opposite to the traveling direction of the pallet. It is provided with an accelerator that adds an initial velocity in the sliding direction of the sintered raw material grains at the entrance of the chute, and / or an accelerator that adds a sliding force in the sliding direction to the sintered raw material grains on the charged chute. Ori,
The accelerator is a gas spraying device that flows gas from the inlet side to the outlet side of the charging chute, and the sintered raw material particles on the charging chute are added with a sliding force by the gas flow. A device for charging sintered raw material grains, which is characterized by this. Sintered raw material granulated by blending the raw material for obtaining sinter is supplied to the entrance of the charging chute having an inclined surface inclined at a predetermined inclination angle with respect to the horizontal direction and slid to the exit. Then, by charging the sintered raw material grains into the pallet of the DL type sintering machine that continuously moves in the horizontal direction from the outlet side of the charging chute, a raw material filling layer including the lower layer portion to the upper layer portion is formed. It is a method of charging sintered raw material grains.
The charging chute charges the sintered raw material grains along the longitudinal direction of the pallet and also charges the sintered raw material grains in the direction opposite to the traveling direction of the pallet. An accelerator for adding the initial velocity of the sintered raw material grains at the entrance of the chute in the sliding direction and / or an accelerating device for adding the sliding force in the sliding direction to the sintered raw material grains on the charged chute are provided. , The sliding speed v _{1'of the sintered raw material grains gliding on the charging chute should be faster than the sliding speed v 1 of} the sintered raw material grains sliding on the charging chute without an accelerator. death,
The accelerator is a drum feeder that cuts out and supplies sintered raw material grains along the inclined surface of the charging chute, and is arranged so that the inlet side of the charging chute is aligned with the cutting port of the drum feeder. A method for charging sintered raw material grains, which is characterized by adding an initial velocity to the sintered raw material grains at the entrance of the charging chute . Sintered raw material granulated by blending the raw material for obtaining sinter is supplied to the entrance of the charging chute having an inclined surface inclined at a predetermined inclination angle with respect to the horizontal direction and slid to the exit. Then, by charging the sintered raw material grains into the pallet of the DL type sintering machine that continuously moves in the horizontal direction from the outlet side of the charging chute, a raw material filling layer including the lower layer portion to the upper layer portion is formed. It is a method of charging sintered raw material grains.
The charging chute charges the sintered raw material grains along the longitudinal direction of the pallet and also charges the sintered raw material grains in the direction opposite to the traveling direction of the pallet. An accelerator for adding the initial velocity of the sintered raw material grains at the entrance of the chute in the sliding direction and / or an accelerating device for adding the sliding force in the sliding direction to the sintered raw material grains on the charged chute are provided. , Sliding speed v of sintered raw material grains gliding on the charging chute ₁ ’, The sliding speed v of the sintered raw material grains when sliding on the charging chute without an accelerator. ₁ To be faster than
The accelerator is a gas spraying device that flows gas from the inlet side to the outlet side of the charging chute, and the sintered raw material particles on the charging chute are added with a sliding force by the gas flow. A method for charging sintered raw material grains, which is characterized by this.

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