JPS5848831B2 - Reduction furnace cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting device for an upright reduction furnace for direct reduction of iron ore, etc., and in particular, in an upright reduction furnace having a flat bottom plate, a cutting device for cutting iron ore, etc. A plurality of openings are provided, a rotating disk is supported directly below these openings, and the rotation of the rotating disk cuts out in-furnace fallout such as reduced iron flowing out from the openings. , Concerning a cutting device for a reduction furnace that can cut continuously and easily adjust the cutting amount. Raw materials such as iron ore are charged from the top of the furnace and are gradually lowered into the furnace toward the hearth. Vertical reduction furnaces are generally known, which supply reducing gas during the process and reduce raw materials to obtain reduced iron.

Conventionally, the cutting equipment for this type of reduction furnace needs to cut out the fallout to the outside while the furnace is full of fallout, and it is necessary to cut out the reduced iron that is the fallout by pushing out or sweeping it out. As a result, the structure is inevitably complicated due to the presence of complicated mechanically movable parts, and there are also problems in maintaining the airtightness of the cut portion and in maintenance and inspection.

In the past, in this type of reduction furnace, the reaction process was carried out while supplying reducing gas etc. into the furnace from the furnace wall side, so the reduction of the raw material flowing down to the center of the furnace was slow, and compared to the The raw material that flows down or descends in the direction toward the furnace wall is reduced more quickly.

Therefore, it is desirable to sequentially cut out the reduced iron from the furnace wall side to obtain an appropriate flow distribution of the fallout in the furnace.

In order to cope with the change in physical properties caused by chemical and physical reactions as the casing descends, it is possible to expand the hearth from the bottom of the reduction furnace, that is, from the top, to form a furnace body with a flared shape. It is an ideal and a wish.

However, enlarging the hearth by forming the furnace body into a shape that widens toward the end has the disadvantage that the cut portion provided therein becomes complicated.

The object of this invention is to provide an opening along the vicinity of the periphery of the hearth, support a rotating disk under the opening,
Provided is a cutting device for a reduction furnace that can continuously and quantitatively cut out reduction precipitate flowing out from an opening by rotation of the rotating disk.

Another object of the present invention is to provide an opening in the vicinity of the periphery of the hearth, and to cut out the in-furnace fallout through this opening, so that the in-furnace fallout can be easily cut out, especially from the furnace wall side, and To provide a reducing furnace cutting device that can obtain an appropriate flow distribution, expand the hearth part, and increase the size of this type of reducing furnace.

Furthermore, it is an object of the present invention to provide a cutting device for a reduction furnace in which the amount and speed of cutting can be variably and easily adjusted or controlled by cutting out the reduction fallout in the furnace using a rotating disk. .

In the past, an object of the present invention is to provide a cutting method for a reducing furnace which has an extremely simple structure, is easy to construct and construct a reducing furnace, contributes to reducing the construction cost of the reducing furnace including the cutting device, and is easy to maintain and inspect. Provide output device.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side sectional view showing an embodiment of the cutting device of the present invention;
Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a schematic side sectional view showing a partially modified embodiment of this device, and Fig. 4 is a modified embodiment of the rotating disk used in this device. FIG.

As shown in FIG. 1, the bottom of the reducing furnace 1 is formed into a shape that widens toward the end.

A flat hearth 2 is formed at its bottom.

The hearth 2 is formed into a circular shape as shown in FIG. 2, and a circular opening 3 is bored along the vicinity of its periphery.

A plurality of openings 3, four in this embodiment, are provided at equal intervals along the vicinity of the periphery of the hearth 2.

As shown in FIG. 1, this opening 3 is connected with a cylindrical body 4 that hangs below the hearth 2, and a cutting opening 5 is formed therein.

Directly below this cutting port 5, a flat disc 6 is supported so as to be freely rotatable in the horizontal direction.

A rotating shaft 7 extending downward from the center is attached to the bottom surface of the rotating disk 6.

A bevel gear 8 is attached to the end 7a of the rotating shaft 7, and meshes with a bevel gear 10 provided on the drive shaft 9 of the drive source M.
The rotating disk 6 is rotationally driven.

Additionally, a scraper plate 11 is provided near the periphery of the upper surface of the rotating disk 6, that is, the surface facing the hearth opening 3.

The scraper plate 11 is supported on the inner wall 13 of a housing 12 formed below the opening 3 of the hearth 2 and surrounding the cutting port 5 and the rotary disk 6.

In addition, the lower end of the housing 12 is constricted and the chute 1
4 is formed.

An on-off valve 15 is attached below this chute 14.

The upper end of the housing 12J) is fixed to the lower wall of the hearth 2.

Furthermore, the rotating shaft 7 of the rotating disk 6 is supported through a side wall plate 13a forming the housing 12, and is sealed by appropriate means.

The one-turn rotating disk 6 is supported with a fixed gap just below the opening 3 of the hearth 2, and the inside of the furnace is formed through the gap between the disk 6 and the edge of the cutting port 5 of the cylindrical body 4. The reduced fallout flows out and forms an angle of repose θ.

Therefore, as the disc 6 rotates, the in-furnace fallout on the disc 6 also rotates, and the material that reaches the scraper plate 11 is cut into the chute 14 by sliding contact with the scraper plate 11.

Next, as shown in FIG. 3, the outer cylinder 16 is fitted around the outer periphery of the cylindrical body 4 which is connected to the peripheral edge of the opening 3 of the hearth 2 so as to be movable up and down.

By moving this outer cylinder 16 up and down along the outer periphery of the cylindrical body 4, the size of the gap between the cutting port 5 and the disk 6 can be adjusted, and the amount of fallout in the furnace can be adjusted. It is possible.

As shown in FIG. 4, the rotary disk 6 is cut out by providing a scraper 17 which protrudes in a spiral shape on its upper surface 6a so as to scrape off the falling material descending from the cutting port 5.

In this case, there is no need to slide the scraper plate 11 onto the disk 6.

In addition, as shown in FIGS. 1 and 2, l scraper plates 11 are provided to slide on the disk 6, but in this case, the fallout in the reactor is mainly located below the direction in which the scraper plates 11 are provided. It is cut out.

Therefore, if two or more scraper plates 11 are provided facing each other on a disk, the scrapers will fall evenly below the disk 6 and be cut out.

Further, as for the driving method of the rotating disk 6, a bevel gear transmission method, a chain, sprocket transmission method, etc. are adopted for the rotating shaft 14, but the point is that the shaft 14 is rotationally driven and the rotational speed is variably controlled. First, the operation of the cutting device having the above configuration will be described in detail.

Raw materials such as iron ore are charged from the top input port of the furnace 1, and the loaded raw materials are reduced to reduced iron by the reducing gas supplied from the furnace wall 20 direction while descending in the furnace one by one.

The reduced iron sequentially reaches the hearth 2 and flows out into the opening 3.

In particular, as in this embodiment, by forming the furnace 1 to widen toward the end and providing the opening 3 near the periphery of the hearth, reduced iron, which is quickly reduced from the furnace wall 20 side, can be cut out more quickly and the central portion The fallout can be cut out with a delay, and the flow distribution of the fallout in the reactor can be made appropriate.

The reduced iron flowing down through the opening 3 forms an angle of repose on the disk 6 and comes to rest.

Therefore, when the rotating disk 6 is rotated in the direction of the arrow shown in FIG. 2, the reduced iron is scraped up to the scraper plate and cut out below the disk 6 due to the rotation VC of the disk 6.

The cut reduced iron is guided through the chute 14 by the disk 6, and is transported out of the furnace by opening the on-off valve 15.

By rotating the disk 6, the reduced iron falling in the furnace can be cut out continuously and quantitatively.

The cutting amount can be adjusted by adjusting the rotational speed of the disk 6 using the drive device.

As shown in FIG. 4, by changing the shape of the surface or upper surface of the disk 6, or by selecting the surface roughness and material of the surface of the disk 60, the amount of reduced iron cut out by frictional force can be adjusted. and speed can also be adjusted.

In this way, the amount of reduced iron cut out can be easily adjusted and controlled.

In summary, according to the present invention, an opening is provided along the vicinity of the periphery of the hearth, a rotating disk is supported under the opening,
By rotating the disk, the reduction precipitate flowing out from the opening can be continuously and quantitatively extracted.

According to the present invention, an opening is provided near the periphery of the hearth to serve as a cutting port, and the fallout in the furnace is cut out from this opening, thereby making it easy to cut out material from the hearth wall side in particular. In addition, it is possible to obtain an appropriate flow distribution of the fallout in the furnace, and also to enlarge the hearth, making it possible to increase the size of this type of reduction furnace.

Further, according to the present invention, by cutting out the in-furnace reduction fallout using a rotating disk, the cutting amount and speed can be variably adjusted or controlled.

1. The present invention has an extremely simple structure and is easy to construct and construct a reduction furnace, contributes to a reduction in the construction cost of the reduction furnace including the cutting device, and facilitates maintenance and inspection. This is something that makes the most of its features.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the cutting device for a reduction furnace according to the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a partially modified embodiment of this device. FIG. 4 is a schematic side view showing an example, and FIG. 4 is a perspective view showing a modified embodiment of the rotating disk used in this device. In the figure, 1 is a reduction furnace, 2 is a hearth, 3 is an opening, and 6 is a rotating disk.

Claims (1)

[Claims] 1 For an upright reduction furnace, an opening is provided along the vicinity of the periphery of the hearth, and a rotating disk is supported below this opening, so that reduction droplets flow out from the opening due to the rotation of the rotating disk. A cutting device for a reduction furnace characterized by cutting out objects.