JPS62199734A - Method and apparatus for charging raw material to vertical type sintering machine - Google Patents

Abstract

PURPOSE:To increase the flow rate of air for sintering a raw material layer and to improve the productivity of a vertical type sintering machine by charging sintering raw materials which are more finely grained than ordinary used sintering raw materials to be charged to the central part along the side wall of the sintering machine thereby forming the raw material layer. CONSTITUTION:The ordinarily used sintering raw materials 2 are charged from the 1st raw material charging part 20 in the central part to the inside of the sintering machine body of the vertical type sintering machine from above. The sintering raw materials 24 grained more finely then the materials 2 are further charged from the 2nd raw material charging part 21 in the peripheral edge part along the side wall 1a via a partition wall 27. The raw material layer 5 is formed by the simultaneously charged raw materials 2, 24. While the raw material layer is moved downward, the air for sintering is passed through the raw material layer from below to above, by which the raw materials are sintered. The sintering completion zone 8 formed in such a manner is crushed by a crushing device 4 and is taken out. The leakage of the air ascending along the side wall is suppressed by the above-mentioned raw material charging method, by which the flow rate of the air for sintering is increased to increase the sintering speed and the productivity is improved.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to a charging method for charging raw materials into a vertical sintering machine that produces bulk sintered ore by sintering powdered ore, and a method for charging raw materials therein. This is related to the input device.

[Prior Art] An example of the configuration of a conventional vertical sintering machine is shown in FIGS. 3 and 4.

The main components of this conventional vertical sintering machine include a sintering machine body 1, a raw material charging device 3 for charging sintering raw material 2 into the sintering machine body 1, and a crushing device 4. The sintering machine main body I is configured to continuously sinter a raw material layer 5 formed by filling the powdery sintering raw material 2 with an ignition device 6 6 by igniting the raw material layer 5 . That is, once the raw material layer 5 is ignited, sintering using it as a fire source proceeds continuously at a position directly above the ignition device 6.6, forming a sintered zone 7 there, and the sintering progresses continuously. By crushing and taking out the sintered zone 8 in which sintering has already been completed at the bottom of the knot zone 7, the raw material layer 5 is continuously sintered while falling at a predetermined speed due to gravity. It has become.

The crushing device 4 is configured to crush the lower part of the sintered zone 8 in the crushing chamber 9 using hammers IO, 10 that reciprocate in the left-right direction in FIG. It falls in the cooling hopper 12 and is taken out by the bread conveyor I3. The raw material charging device 3 transfers the raw material 2 stored in the raw material hopper 14.14 by a predetermined amount to the drum feeder 15.15 in accordance with the descending speed of the raw material layer 5.
It is designed to be supplied into the sintering machine main body l.

In addition, in this sintering machine, exhaust gas generated during sintering is passed through a suction port 17° through a grate 16.16 provided on the side walls 1a, Ia of the sintering machine main body l. 7, the exhaust gas is sucked in by an exhaust fan (shown in the figure) and discharged. As the exhaust gas is sucked, sintering air is passed through an air pipe 18 provided at the lower part of the product cooling hopper I2.
．． 18, and the air is guided from the product cooling hopper 12 into the sintering machine main body l and raised. By doing this, the sintering air taken in first cools the finished product 11, then passes through the sintering completion zone 8 and is also cooled, and the temperature of the sintering air itself is increased and heat recovery is performed. I will do it. Further, since the high-temperature exhaust gas that has passed through the sintering zone 7 also preheats the raw material layer 5 before reaching the suction ports 17 and 17, heat is recovered here as well. In addition, in order to prevent air from entering through the raw material charging port I9 at the top of the sintering machine main body I due to suction of exhaust gas, the height of the raw material layer 5 is made sufficiently high, and the ventilation resistance is used to seal it. ing.

[Problems to be Solved by the Invention] By the way, the productivity of the conventional sintering machine described above is determined by the speed at which the sintering material 14 is sintered by the wind speed of the sintering air supplied to the sintering zone 7. The higher the wind speed, the higher the sintering speed can be.

In this respect, the conventional sintering number has the following problems.

That is, in the above sintering machine, the side wall 1 of the sintering machine main body 1
Since sintering air is introduced by suctioning exhaust gas from the suction port 17.17 provided in a, Ia, the passing wind speed V of the air passing through the raw material layer 5 is:
As shown in FIG. 4, the side walls 1a, Ia of the raw material layer 5
It is large in the peripheral parts 5b and 5b along the central part 5a.
Therefore, the overall sintering speed was determined by the passing wind speed at the central portion 5a. Then, if the air volume is increased to increase the overall wind speed in order to increase the passing wind speed in the central part 5a, the peripheral part 5b
It has been difficult to improve productivity because the wind speed becomes excessive and causes problems such as the raw material being blown up (into a so-called fluid state).

This invention was made in view of the above-mentioned circumstances, and it is possible to improve productivity by suppressing the passing wind speed of sintering air around the raw material layer, thereby increasing the air volume. It is an object of the present invention to provide a method and a charging device thereof.

[Means for Solving the Problems] In the raw material charging method of the first invention, when a normally used sintering raw material is charged into the sintering machine body to form a raw material layer, the side wall of the sintering machine body is The sintering machine is characterized by simultaneously charging sintering raw materials with finer grains than the normally used sintering raw materials, and suppressing air leakage rising along the side wall of the sintering machine body due to the finer grains of the sintering raw materials. There is.

Further, the raw material charging device of the second invention has a first raw material charging device that is provided at the center of the second part of the sintering machine body and charges the normally used sintering raw material into the center of the sintering machine body. and a second raw material charger, which is provided near the side wall of the upper part of the sintering machine body and charges finer grained sintering raw material than the normally used sintering raw material along the side wall inside the sintering machine body. The sintering machine is characterized by having a partition wall provided in the raw material layer to separate the normally used sintering raw material in the center of the sintering machine body from the fine-grained sintering raw material near the side wall. .

[Function] According to the present invention, the fine grained sintering raw material charged along the side wall of the sintering machine body suppresses air leakage rising along the side wall of the sintering machine body, and as a result, the sintering speed is increased. and improve productivity.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. Note that the same parts as those in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted.

First, the configuration of the raw material charging device of the present invention will be explained.

In the figure, 20 is the first raw material charging section, 21 and 2I are the second raw material charging section.
This is the raw material charging section.

The first raw material charging section 20 is for charging the normally used sintering raw material 2 into the center of the sintering machine main body I, and is provided at the upper center of the sintering machine main body I.

In the case of this example, the first raw material charging section 20 includes a first hopper 22 provided at the upper center of the sintering machine main body I and to which the normally used sintering raw material 2 is supplied, and a The first drum feeder 23 is provided below the bottom opening and is rotatable to the left and right about a horizontal axis (the axis in the front and back directions in the drawing).

On the other hand, the second raw material charging section 21.21 charges a sintering raw material 24 with finer grains than the normally used sintering raw material 2 along the side walls 1a, 1a inside the sintering machine main body 1. They are provided on both sides of the first raw material charging section 20. In the case of this example, the second raw material charging section 21 is provided at a position near the upper side walls 1a, 1a of the sintering machine main body l, and a second raw material charging section 21 is provided with a fine grained sintering raw material 24. A second drum feeder 26 is provided below the bottom opening of the hopper 25 and is rotatable in the direction of the arrow in the figure about the horizontal axis (the axis in the front and back directions of the figure). has been done. Further, the lower part of the hopper 25 is extended into the raw material layer 5, and the extended portion is used to hold the normally used sintering raw material 2 charged into the center of the sintering machine main body l, the side wall 1a,
A partition wall 27 is formed to separate the fine grained sintering raw material 24 charged closer to Ia.

The other configurations are the same as the conventional multiplexed example.

Next, the raw material charging method of the present invention will be explained together with the operation of the raw material charging device having the above structure.

The first raw material charging section 20 charges the normally used sintering raw material 2 stored in the hopper 22 into the center portion 5a of the raw material layer 5 in accordance with the sintering speed by rotating the drum feeder 23. The drum feeder 23 is periodically switched to rotate leftward and rightward, and charges the particles so that the particle size distribution does not become unbalanced on the left and right sides due to segregation.

The second raw material charging section 21.21 includes a drum feeder 26
．． 26 rotates the fine sintering raw material 24 stored in the hopper 25.25 into the raw material layer 5 in accordance with the sintering speed.
The peripheral portions 5b, 5b of the container are charged.

Since the partition wall 27 is inserted into the raw material layer 5, there is a gap between the central part 5a of the raw material layer 5 and the side walls 1a, Ia
The surrounding areas 5 b and 5 b are separated from each other, and the normally used sintering raw material 2 and the fine-grained sintering raw material 2 are separated from the surrounding areas 5 b and 5 b.
The width of 4 is always constant.

In this way, at the same time as the normally used sintering raw material 2 is charged into the sintering machine main body l, the fine grained sintering raw material 21 is placed on the side wall 1a,
By charging along Ia, a relatively large sintering raw material 2 that is normally used is located in the center part 5a of the raw material layer 5,
Relatively small fine grained sintering raw materials 24 are located in the peripheral parts 5 b, 5 b of the raw material layer 5 . The fine grained sintered raw material 24 becomes a large ventilation resistance and the side walls 1a, 1a
2, and the air passage velocity V in the peripheral portions 5b, 5b is kept small as shown in FIG. As a result, the wind speed in the central portion 5a can be increased to increase the sintering speed, thereby making it possible to improve productivity.

Further, since there is no air blow-through in the peripheral portions 5b, 5b, baking is carried out regularly and the pot yield is improved.

Furthermore, since the hoppers 22, 25, and 25 are each configured independently, it is also possible to change the coke ratio of the fine-grained sintering raw material 24 charged into the peripheral parts 5b, 5b. The unsintered portions in parts 5b and 5b can be sufficiently sintered, and the pot yield is improved. That is, by increasing the coke ratio in the fine-grained sintering raw material 24, the amount of heat radiated from the side walls la, Ia to the atmosphere is covered, and the side wall la.

The pot yield can be increased by sufficiently sintering around la. By the way, conventionally, the peripheral parts 5b, 5
Since the sintering raw material with the same coke ratio as the normally used sintering raw material 2 was charged in the side wall 1a, Ia
The sintering raw materials in the peripheral portions 5b, 5b were not sufficiently sintered due to heat radiation from the sintering materials to the atmosphere.

[Effects of the Invention] As explained above, according to the present invention, since the sintering raw material, which is finer than the normally used sintering raw material, is charged along the side wall of the sintering machine body, the following effects can be achieved. It has a similar effect.

■ Fine-grained sintering raw material suppresses air leakage from the peripheral area along the side wall of the sintering machine body, resulting in an increase in the amount of air passing through the sintering zone, improving productivity.

■By suppressing air leakage from the peripheral area along the side wall of the sintering machine body, the unit air volume can be reduced, resulting in energy savings.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 show one embodiment of the present invention.
The figure is a schematic configuration diagram of the entire vertical sintering machine equipped with the raw material charging device of this embodiment, and FIG. 2 is a partial sectional view for explaining its operation. Figures 3 and 4 show conventional examples; Figure 3 is a schematic configuration diagram of the entire vertical sintering machine equipped with a conventional raw material charging device;
The figure is a partial sectional view for explaining its function. l...Sintering machine body, la...Side wall,
2... Normally used sintering raw material, 3... Raw material charging device, 4... Crushing device, 5... Raw material layer, 5a...・Central part, 5
b...peripheral part, 20...first raw material charging section, 21...second raw material charging section, 22...first Hopper, 23...First drum feeder, 24...
- Fine grain sintering raw material, 25... Second hopper, 26... Second drum feeder, 27...
・Partition wall. Figure 1 Figure 3 Figure 4

Claims (3)

[Claims] (1) Powdered sintering raw material is charged into the inside of the sintering machine from above to form a raw material layer, and while moving this raw material layer downward, it is also This is a method of charging raw materials in a vertical sintering machine, in which the sintered product is sintered while passing sintering air toward the target, and then the sintered product is crushed and taken out from the bottom of the sintering machine. When charging the sintering raw material to be used into the sintering machine body to form a raw material layer, sintering raw material with finer grains than the normally used sintering raw material is simultaneously charged along the side wall of the sintering machine body. A raw material charging method for a vertical sintering machine is characterized in that the fine-grained sintering raw material suppresses air leakage rising along the side wall of the sintering machine body. (2) Sintering in which a raw material layer made of powdered sintering raw material formed inside is moved downward and sintering air is passed through the raw material layer from below to above. The above-mentioned vertical sintering machine includes a machine body, a charging device for charging the sintering raw material into the sintering machine body to form the raw material layer, and a crushing device for crushing the sintered product. The raw material charging device includes a first raw material charging section that is provided at the center of the upper part of the sintering machine body and charges normally used sintering raw materials into the center of the sintering machine body; A second raw material charging section is provided near the upper side wall and charges finer grained sintering raw material than the normally used sintering raw material along the side wall inside the sintering machine main body; A raw material for a vertical sintering machine, characterized in that the partition wall is provided to separate a normally used sintering raw material in the center of the sintering machine body from fine-grained sintering raw materials near a side wall. Charging device. (3) The first raw material charging section has a hopper located at the center of the upper part of the sintering machine body into which normally used sintering raw materials are supplied, and a horizontal axis centered at the bottom of this hopper. Claim No. 1, characterized in that the drum feeder is rotatably provided and rotates left and right to distribute and charge the sintering raw material in the hopper to the left and right at the center of the sintering machine main body. A raw material charging device for a vertical sintering machine according to item 2.