JPS6032113B2 - Shaft furnace cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting device for a shaft furnace, and in particular, the hearth of a shaft furnace is divided into a plurality of passages to form an extraction port, and a plate is placed near the entrance of each passage into the furnace. The power is swingably supported and a cut-out valve is provided between the passages so as to be freely openable and closable, so that the fallout in the furnace is crushed from the play cage and falls into the passage, and is cut out by opening and closing the cut-out valve. The present invention relates to a cutting device for a shaft furnace that can quantitatively and continuously cut out in-furnace fallout and easily cut out lumpy fallout.

An upright shaft furnace is generally used as a subordinate or direct reduction furnace.

This shaft furnace is provided with a hopper for charging raw materials at the top of the furnace, and an outlet for extracting the reduced or reaction-treated fallout at the bottom. Therefore, raw materials such as iron ore are charged into the furnace from a hopper at the top of the furnace, and the loaded raw materials descend to the top due to gravity, are reduced by reducing gas etc. supplied from the furnace wall direction, and are extracted. It is extracted or cut out from the mouth. The purpose of this invention is to divide the hearth of a shaft furnace, provide passages to form extraction ports, swingably support the play force near the entrance of each passage, and install a cutoff valve between the passages. A shaft furnace capable of quantitatively and continuously cutting out in-furnace fallout by opening and closing the furnace so that it can be freely opened and closed, crushing the in-furnace fallout by the above-mentioned play force, lowering it into a passage, and opening and closing a cutting valve to cut out the in-furnace fallout. Provides a cutting device.

Another object of the present invention is to divide the hearth of a shaft furnace and provide passages, so that the fallout can be selectively cut out from each passage, thereby achieving an appropriate flow distribution of the fallout inside the furnace. To provide a cutting device for a shaft furnace, which can obtain a flat hearth without narrowing down the bottom of the furnace, and can increase the size of this type of shaft furnace.

Furthermore, it is an object of the present invention to provide a cutting valve between the passages so as to be able to open and close freely, thereby making it possible to measure and quantitatively cut out the amount of in-furnace fallout between the passages, and to cut out each piece of fallout quantitatively. To provide a cutting device for a shaft furnace capable of continuously cutting from inside the furnace by changing the relation or position of a cutting valve between passages. Another object of the present invention is to cut out a shaft furnace in order to provide a swinging force near the entrance of the passageway into the furnace, so that the lumpy fallout in the furnace can be crushed and easily lowered into the passageway. Provide equipment. Another object of the present invention is a cutting device for a shaft furnace that can reduce as much as possible the driving load for conveying the fallout from the furnace to the outside of the furnace since the load inside the furnace is received by the hearth and the cutting section. I will provide a.

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of a cutting device for a shaft furnace according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1.

As shown in the figure, two partition walls 3 and 4 are supported to divide the hearth portion of the shaft furnace 1 into three parts, thereby forming three extraction ports 2.

The partition walls 3 and 4 allow the passage A to be formed by the furnace side wall 5 and the partition wall 3, and the passage A to be formed by the partition walls 3 and 4.
A through passage is formed by the partition crab 4 and the furnace side wall 6, respectively.
Note that it is free to divide the passages at appropriate intervals to form a plurality of passages depending on the size of the furnace.

Corresponding surfaces 5 of the furnace side wall 5, partition walls 3, 4, and furnace side wall 6 forming or dividing these passages A2, A3, respectively.
Grooves 7, 7 having a half-moon shape in cross section are provided in a, 3a, 3b, 4a and 4b, 6a. A cylindrical rotary leaf feeder 8 serving as a cut-out valve is rotatably inserted into the grooves 7, 7. The rotary feeder 8 rotatably supported between the passages A, . This receiving groove 9 has a gateway 10 that is equal to the inside of the passage and has a slope 11 that slopes inward, forming a measuring container for the fallout falling in the furnace between the passages. Further, as shown in FIG. 2, the rotary feeder 8 has a drive shaft 12 attached thereto and rotates while sliding within the grooves 7, 7 between the passages, and the receiving groove 9 rotates from the direction of the passage entrance a to the direction of the exit b. do. In this way, the receiving groove 9 measures the falling material in the furnace in fixed amounts and cuts out the passage by opening the passage as it rotates.

Seal members 13 are provided at the edges of the grooves 7, 7 between the passages, respectively, to keep the interior of the furnace confidential and to prevent fallout taken into the receiving groove 9 from being drawn into the sliding surface. prevent. Further, although only one receiving groove 9 is provided in the rotary leaf feeder 8 in the illustrated embodiment, it is also possible to provide a plurality of receiving grooves 9 at appropriate intervals in the radial direction. Furnace inlet a of each passage A, , A2, A3
A play force 14 that is swingably supported is provided nearby.

This playing force 14 is applied to the blades 1 extending radially to the rotating shaft 15.
6 and a stator 18 interposed between the rotors 17. This stator 1
8 is attached so as to protrude into the passage from the furnace side wall 5, partition legs 3 and 4, and furnace side wall 6 forming the passage, and is configured to mesh with the rotor 17 of the rotating shaft 15. Therefore, by driving the rotary shaft 15 and swinging the rotor 17, the fallout in the furnace, especially the lumps, is crushed and allowed to fall or flow out into the passage. The rotor 17 and the stator 18 are arranged alternately and in mesh with each other at appropriate intervals,
The playing force 14 is configured. Further, the rotor 17 is supported so as to be able to perform an external rotational movement such as a rocking motion, and rotates between the stators 18 as necessary to crush the fallout in the furnace and lower it into the passage. A belt conveyor 19 is provided below the outlet b side of the passages A, , A2, and A3, and conveys the in-furnace fallout cut out from each passage to the outside of the furnace. Further, 20 in the figure is a housing that seals the belt conveyor 19 and the furnace 1, and a degassing pipe 21 is attached to the housing 2.

Next, a method of operating the cutting device having the above configuration will be explained. First, the rotary leaf feeder 8 between the passages A, , A2, and A3 is set to rotate by changing the angle or phase of the receiving groove 9.

That is, as shown in FIG. 1, in the passage A, the receiving groove 9
is facing upward in the direction of the furnace, and receives the in-furnace fallout, and in the passage A2, the receiving groove 9 is rotating 90 degrees and transporting or cutting out the in-furnace fallout, and at the same time, the cylindrical body The receiving groove 9 in the passage A3 is rotated 180 degrees and opened to the passage outlet b, and the in-furnace fallout is transferred to the belt conveyor 19.
Cut out the top. In this case, the play force 14 on the passage is set so that it swings only when the receiving groove 9 of the rotary feeder 8 is opened toward the inside of the furnace, thereby crushing the falling material inside the furnace and causing it to fall. Therefore, when the rotary feeder 8 is rotationally moved within the passage by the drive shaft 12 and the receiving groove 9 is turned upwardly into the furnace, the play force 14 follows and operates.

As the rotor 17 of the play force 14 swings, it engages with the stator 18 and crushes the fallout in the furnace, causing it to fall into the receiving groove 9. After a certain amount of falling material has flowed into the receiving groove 9, the driving of the play force 14 is stopped and the rotary feeder 8 is rotated. As the rotary feeder 8 rotates, the receiving groove 9 opens to the passage outlet b to cut out the in-furnace fallout. Rotary feeder 8 like this
are rotated between passages A, , and, respectively, and cut out the in-furnace fallout from the passages. Further, as described above, by sequentially changing the rotation angle or phase of the receiving groove 9 of the rotary feeder 8, each passage A, , A2, A3
It is possible to sequentially and quantitatively and continuously cut out the in-furnace fallout. Furthermore, a rotary feeder 8 between each passage
By setting each of them to rotate variably and setting the operation of the play force 14 to follow this, it is possible to perform "vertical cutting" from the part of the furnace where the reaction process is quick. For example, If the reduction reaction of the substance is not carried out uniformly, set the rotation speed of the rotary feeder 8 between the passages located in the part where the reduction rate is low to be low, and set the rotation speed of the rotary feeder 8 between the passages located in the part where the reduction rate is high on the other hand. If the rotation speed of the rotary feeders 8 is set to rotate quickly, a product with a uniform reduction rate can be obtained.
By operating the receiving groove 9, the fallout in the furnace can be continuously cut out in a fixed amount at a time.

The fallen material sequentially cut out from passages A, , A2, etc. is conveyed to the outside of the furnace by a belt conveyor 19. In summary, according to the present invention, the hearth of a shaft furnace is divided into passages, the play force is swingably supported near the entrance of each passage, and a cutoff valve is rotatably provided between the passages. By pulverizing the in-furnace fallout by the above-mentioned play force and lowering it into the passageway, rotating the cutting valve and discharging it out of the furnace, the in-furnace fallout can be quantitatively and continuously cut out. It is something.

Furthermore, since the extraction port of the shaft furnace is divided into passages, the in-furnace fallout can be selectively cut out from each passage, and an appropriate flow distribution of the in-furnace fallout can be obtained and a flat flow can be achieved. Since a large hearth can be provided, this type of shaft furnace can be made larger. Furthermore, by rotatably providing a cut-off valve between the passages, the present invention can quantitatively cut out the in-furnace fallout between the passages, and the rotation angle of the cut-off valve between each passage can be changed. This allows continuous cutting from inside the furnace. Further, according to the present invention, by providing a play force near the entrance of the passageway into the furnace, it is possible to easily cut out lumpy in-furnace fallout.

In addition, since the present invention receives the load of the fallout inside the furnace at the hearth and the cut-out portion, it exhibits various excellent features such as being able to reduce the driving load for transporting it out of the furnace as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a cutting device for a shaft furnace according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. In the figure, 1 is a shaft furnace, 2 is an extraction port, A, A3 is a passage, 14 is a play force, and 8 is a rotary leaf feeder. Machine 1 screen screen 2 screen

Claims (1)

[Claims] 1 The hearth of a shaft furnace is divided into passages, a breaker is swingably supported near the entrance of each passage, and a cut-out valve is provided between the passages so as to be openable and closable, so that the fallout in the furnace can be removed from the breaker. A cutting device for a shaft furnace, characterized in that the cutting device is configured to separate or crush the material and lower it into a passage, and then open and close a cutting valve to cut out the material.