JPS5848829B2 - Reduction furnace discharge device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a discharge device for a reduction furnace, and in particular, an outer cylinder is provided at the discharge port of the reduction furnace so that it can be raised and lowered, and a cone-shaped bell is provided at the lower opening of the outer cylinder. Then, the outer cylinder is moved up and down on a bell to open and close the inside of the furnace to continuously discharge the reduced pellets, and the fully reduced pellets are discharged continuously while controlling the flow rate. The present invention relates to a reducing furnace discharge device that can easily achieve airtightness, has an extremely simple structure, and can exhibit excellent effects.

Upright shaft furnaces are widely used as conventional reduction furnaces, and these shaft furnaces are equipped with a hopper at the top of the furnace for feeding raw materials. The gravitational force lowers the inside of the furnace one by one while supplying reducing gas from the furnace wall to reduce the pellets to reduced pellets (reduced iron).The pellets are then degassed near the hearth, cooled, and discharged to the outside. .

The device for extracting and discharging the reduced pellets in the conventional shaft furnace is installed inside the hearth near the hearth, has many moving parts, and has a complicated structure.In particular, it is difficult to maintain the airtightness of the gas in the furnace in the discharge device section. It was considered difficult.

Furthermore, since the inside of the furnace is under high pressure and temperature, the reduced pellets are discharged intermittently while the discharge passage is divided and blocked, resulting in extremely poor workability.

Furthermore, since the reduction furnace supplies reducing gas from the furnace wall side to the inside, the reduction of the iron ore flowing down to the center of the furnace is slowed down.
This resulted in variations in the so-called quality of the products.

Therefore, the inventors of the present invention took into consideration the problems with the conventional device.
As a result of intensive research to effectively solve this problem, we have completely abandoned this invention.

The object of the present invention is to provide an outer cylinder that can be raised and lowered at the outlet of a reduction furnace, a cone-shaped bell facing the lower opening of the outer cylinder, and to raise and lower the outer cylinder above the bell. To provide a discharge device for a reduction furnace, which is configured to open and close the interior of the furnace by moving the furnace to discharge reduced pellets, and can discharge the reduced pellets continuously and while controlling the flow rate.

Another object of the present invention is to easily attach a means for driving the outer cylinder to the exhaust port of the reduction furnace in order to control the flow rate and discharge the outer cylinder by means of an outer cylinder that moves up and down in the axial direction. and the driving means can be installed outside the furnace,
To provide a discharge device for a reduction furnace which does not require airtightness and can easily and completely seal the inside of the furnace and an outer cylinder.

Furthermore, it is an object of the present invention to install a cone-shaped bell under the discharge port so as to force the reduced pellets to be discharged from the inside of the furnace, while preventing the discharge of unreduced pellets. To provide a discharge device for a reduction furnace, which allows raw material iron ore in the furnace to have an appropriate flow distribution, expands a hearth discharge part, and allows this type of reduction furnace to be enlarged.

Further, the object of the present invention is to have a simple structure of the entire device, easy to maintain and inspect the driving part and sealing part, and to be able to connect the whole device in multiple stages, so that degassing and cooling processes can be completely performed. To provide a discharge device for a reduction furnace, which can be used in a high-pressure furnace, has a simple structure, can be provided at low cost, and can be easily installed in a conventional reduction furnace.

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 reduction furnace discharge device according to the present invention.

As shown in the figure, a cylinder 4 hanging below the reduction furnace 1 has an opening 5 at its lower end, and this opening 5 forms a reduction pellet outlet 6.

An outer cylinder 7 that moves up and down in the axial direction is attached to the outer periphery of the cylinder 4.

This outer cylinder 7 is attached to the outer periphery of the cylinder body 4 so as to be slidable up and down.

Further, a conical bell 8 whose apex faces upward relative to the openings of the cylindrical body 4 and the outer cylinder 7 is fixed and supported by a support frame 9.

The edge of the lower end opening 10 of the outer cylinder 7 has a conical bell 8.
The outer cylinder 7 and the bell 8 close the furnace outlet 6.

Further, by moving the outer cylinder 1 upward and separating the outer cylinder 7 from above the bell 8, the discharge port 6 is opened.

Further, a hopper 12 is provided below the opening 10 of the outer cylinder 7, and a partition wall 13 is extended to the upper end of the hopper 12, and an upper plate 14 is provided to form a sealed chamber 15. be done.

An opening through which the outer cylinder 7 is inserted is provided in the center of the upper plate 14, and an airtight retaining means 16 is provided to maintain airtightness between the outer cylinder 7 and the chamber 15.

Inside this chamber 15, the conical bell 8 is held as shown.

Also, in the upper part of the chamber 15, there is a passage 38 for extracting gas.
is provided.

Next, a pin 1 for engaging the connecting rod with the outer wall of the outer cylinder 1
7 are respectively provided on the opposing faces, and pins 18 are similarly provided on the outer wall of the cylinder 4 depending on the furnace 1 for engaging the connecting rods.

Connecting rods 19 and 20 are engaged with the pins 17 and 18, and hydraulic cylinders 21 are connected to both ends of the connecting rods 19 and 20.
A drive device 22 having a drive unit 22 is connected in series.

The hydraulic cylinder 21 of this drive device 22 has a movable arm 2.
3 are arranged in series, and the ends of the connecting rods 19 and 20 are connected to this movable arm 23.

Further, this drive device 22 is attached to and supported by a support frame 24 that stands up at the upper end of the chamber 15.

Therefore, by driving the movable arm 23 connected to the hydraulic cylinder 21 of the drive device 22, the connecting rods 19 and 20 are loosened and the outer cylinder 7 is moved up and down in the axial direction around the outer circumference of the cylinder body 4. .

Note that 26 is a mounting bracket for mounting the drive device 22 to the support frame 24.

Further, the hopper 12 is provided with an outlet 25 for taking out the discharged and reduced pellets.

Next, FIG. 2 is a cross-sectional view showing a specific embodiment for hermetically sealing the discharge device of a reduction furnace according to the present invention.

As shown in the figure, an annular receiving portion 27 surrounding the outer wall of the outer cylinder 7 is provided at the upper part of the outer cylinder 1 that moves up and down in the axial direction.
On the other hand, an annular skirt 28 surrounded by the outer wall of the cylindrical body 4 hanging down from the furnace 1 is suspended, and this skirt 28 is configured to be fitted into the receiving part 27 of the outer cylinder 7.

The receiving portion 27 of the outer cylinder 7 is filled with water or oil 29 .

Further, the lengths of the receiving portion 27 and the skirt 28 in the axial and longitudinal directions are determined by the maximum stroke of the vertical movement of the outer cylinder 7.

The above receiving portion 27 and skirt 28 completely maintain airtightness between the outer cylinder 7 and the cylindrical body 4 of the furnace 1.

Next, to maintain airtightness between the outer cylinder 1 and the chamber 15, a cylindrical body 30 surrounding the outer periphery of the outer cylinder 7 is erected from the opening periphery of the chamber 15, and the cylindrical body 30 surrounding the outer periphery of the cylindrical body 30 is surrounded. An annular side plate 31 stands up on the upper plate 14 of the chamber to form a receiving part 32, and an annular skirt 33 that fits into this receiving part 32 is suspended outside the lower part of the outer periphery 7.

The skirt 33 of the outer cylinder 7 moves up and down within the receiving part 32 following the vertical movement of the outer cylinder 7.

Further, this receiving portion 32 is filled with water or oil 29 to maintain airtightness.

Further, the lengths of the receiving portion 32 and the skirt 33 in the axial direction are, of course, determined by the size of the stroke in the vertical movement of the outer cylinder 7, as described above.

Further, an annular shoe 35 that hangs downward is provided at the lower edge of the outer cylinder 7.

This shoe 35 is enlarged outwardly and tilted, and the bell 80
The surface is configured to abut against the inclined surface.

In addition, 36 in the figure is a support for fixing the bell 8 to the support frame 9.

A method of operating the reducing furnace discharge device described above will be described in detail.

Iron ore introduced from the top of the furnace 1 is gradually lowered inside the furnace by its own weight, and a reducing gas such as H is introduced into the furnace from the direction of the furnace wall.
A mixed gas of 2+CO is supplied, and the reduced iron is reduced to fall toward the hearth.

The reduced iron or reduced pellets descended in this manner are sequentially guided into the cylinder 4, and are subjected to a load on the bell 8 when the furnace is closed by the outer cylinder 7 and the bell 8.

Next, when the outer cylinder 7 is moved upward by the drive device 22, the bell 8 and the outer cylinder 7 are separated, the inside of the furnace is opened, and the reduced pellets are discharged into the hot spring 12 below.

Further, the inside of the furnace is opened following the upward movement of the outer cylinder 7, but the reduced pellets descending inside the furnace receive a load on the conical bell 8, which especially receives the pellets descending from the center of the furnace. It is discharged from the outer part of the bell 8, that is, the part in contact with the outer cylinder 7, along the inner circumferential wall of the outer shell.

Therefore, the flow of raw materials in the furnace can be made uniform, and the products can also be made uniform.

Due to the upward movement of the outer cylinder 7, the reduced pellets discharged from the furnace are dropped into the hopper 12 and placed in the passage 3 in the chamber 15.
Toxic gas is extracted through B and cooling gas is filled into the chamber 15 to cool the reduced pellets.

Note that this exhaust gas is cleaned and returned as a reducing gas for use.

Further, when the outer cylinder 7 is pulled rearward while swinging the movable arm 23 upward by driving the hydraulic cylinder 21 of the drive device 22, the connecting rods 19 and 20 are pulled, and the connecting rod 1
9 , the outer cylinder 7 moves upward along the axial direction of the cylinder body 4 .

When this outer cylinder 7 moves upward, the receiving part 27 provided at the upper part of this outer cylinder 7 moves while fitting and inserting the skirt 28 provided on the cylinder body 4, and also the receiving part 27 provided at the lower part of the outer cylinder 7 skirt 3
3 is pulled out by the receiving part 32 and moved upward, and each is kept airtight by water or oil.

Next, FIG. 3 is an explanatory diagram showing a specific embodiment in which the present apparatus is provided in multiple stages under the reduction furnace.

This device A is attached to the lower discharge port 5 of the shaft furnace 1, and the reduced pellets discharged from the furnace 1 by the discharge device A are received by the hopper 12, and the hopper 12
The discharge device A is attached to the discharge port 36 of the hopper 12 in the same manner as described above, and the reduced pellets accumulated in the hopper 12 are discharged to the outside and transported by the conveyor 37 to the next process.

Note that 2 is a hopper attached to the top of the furnace 1 for charging raw materials.

As described above, if the outer cylinder 7 is moved upward apart from the bell 8 and the reduced pellets in the furnace 1 are discharged while controlling the flow rate, the reduced pellets can be continuously discharged from the furnace. In addition, by installing the product in multiple stages, it is possible to take it out to the outside and transport it to the next process while cooling and degassing are performed continuously.

In summary, according to the present invention, an outer cylinder that moves up and down in the axial direction is provided at the outlet of the reduction furnace, and a conical bell is made to face the lower opening of the outer cylinder. The reduced pellets can be continuously discharged by raising and lowering the furnace to open and close the inside of the furnace, thereby allowing the reduced pellets to be discharged continuously while controlling the flow rate.

In addition, since the reduced pellets in the furnace can be discharged from the exhaust port of the reduction furnace while controlling the flow rate by an outer shell that moves up and down in the axial direction, a means for driving this outer shell can be easily attached to the outside. .

Further, since the driving means can be installed outside the furnace, airtightness is not required, and the inside of the furnace and the outer cylinder can be easily hermetically sealed.

Furthermore, the reduced pellets descending with a cone-shaped bell facing below the discharge port can be discharged at a faster flow rate than the inside of the furnace where they have been sufficiently reduced, and the unreduced pellets located in the center of the furnace can be discharged. While preventing discharge to the outside, it is possible to obtain an appropriate flow distribution of the raw material iron ore in the furnace, and therefore the hearth discharge section can be expanded, and it is also possible to increase the size of the furnace.

In addition, the structure of the entire device is simple, maintenance and inspection of the drive section and sealing section is easy, and the entire device can be connected in multiple stages for use, and degassing and cooling processes are completely and easily performed. It exhibits various excellent features such as being able to be used in high-pressure furnaces, and having a simple structure, it can be provided at a low price, and can be easily installed in conventional furnaces.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a preferred embodiment of the discharge device for a reduction furnace according to the present invention, FIG. It is an explanatory view showing a concrete example provided in multiple stages. In the figure, 1 is a reduction furnace, 5 is a discharge port, 7 is an outer cylinder, and 8 is a bell.

Claims (1)

[Claims] 1. An outer cylinder is provided at the outlet of the reduction furnace so that it can be raised and lowered, and a cone-shaped bell is exposed to the lower opening of the outer cylinder, and the outer cylinder is raised and lowered over the bell to open and close the inside of the furnace. A reduction furnace discharge device characterized by being configured to continuously discharge internal fallout.