JPH0660334B2 - Bellless furnace top charging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bellless furnace top charging device for a vertical furnace such as a blast furnace.

(Prior Art) In the operation of a blast furnace, it is extremely important to control the distribution of charging when the raw material is charged into the furnace from the top of the furnace in order to stabilize the furnace condition and increase the gas utilization rate in the furnace. is there.

In the bellless charging device shown in FIG.
The flow rate of the raw material charged in is controlled by the flow rate control valve 2 to control the charging amount in the radial direction of the furnace. However, the raw materials from the raw material hoppers 3 arranged on the left and right sides are subjected to the horizontal velocity component a as shown in FIG.
Occurs, and the point at which the raw material falls on the in-furnace shout 1 changes depending on the orientation of the in-reactor shout 1, and the distances l and l ′ over which the raw material slides on the in-reactor shout differ, resulting in differences in the flight distance of the raw material It has a disadvantage that it is not preferable for uniform control of the circumferential distribution.

In order to eliminate this drawback, Japanese Patent Publication No. 57-4 shown in FIG.
A bellless charging device such as No. 8618 has been devised, and the flow rate control valve 2 is arranged just below the raw material hopper 3, and the raw material discharged from the flow rate control valve is dropped directly into the in-furnace shout 1. Since the flow rate control valve 2 always keeps the raw material dropping point to the shout invariable regardless of the orientation of the in-furnace shout 1, the shape of the opening S is almost the center of the opening as shown in FIG. 9 (A). The one that is 7 is adopted.

(Problems to be solved by the invention) However, the flow rate control valve of this type has left and right valve plates 9a and 9b.
It is clear from the model test and actual test results that the center of the raw material flow does not coincide with the core 7 because the horizontal component b is generated in the raw material flow at the time of discharge as shown in FIG. However, it has a disadvantage that it is not preferable for uniform control of the raw material distribution.

The object of the present invention is to improve the above-mentioned drawbacks, and to control the charging distribution by using a flow rate control valve which has the same open-hole shape at the time of discharging the raw material and which does not generate a horizontal component in the raw material flow. It is intended to provide a furnace top charging device that can be improved.

(Means for Solving the Problems) In the present invention, the raw material stored in the raw material hopper 3 is introduced into the furnace via a flow rate control valve 2 provided in the lower portion of the hopper and a swirl shout 1 provided in the furnace. In the bellless furnace top apparatus to be charged, the flow rate control valve is composed of three or more valve plates 10 having the same apex angle α, and when fully closed, the apex 8 of the valve plate coincides with the furnace core, and A bellless type, characterized in that when the openings are formed, the sides of adjacent valve plates come into contact with each other so that they can move back and forth, and the size of the openings S formed at the sides of each valve plate is variable. It is a furnace top charging device.

(Operation) In the furnace top charging device according to the present invention, the opening shape can maintain a concentric shape centering on the furnace core regardless of the flow rate of the flow control valve depending on the flow rate. Also, since the valve plates that make up the valve are all formed on the same level surface, it is possible to always maintain a stable vertical drop without causing a horizontal component in the raw material flow when the raw material is discharged. .

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The overall structure is the same as in FIG.

In order to discharge the raw material stored in the raw material hopper 3 onto the in-furnace shout 1 at an appropriately set flow rate, the flow rate control valve 2 is installed below the raw material hopper 3. When the flow rate control valve 2 is composed of a plurality of three or more valve plates 10, for example, four valve plates 10,
As shown in the figure, the apex 8 of each valve plate is aligned with the core 7 when fully closed,
The apex angle α of each valve plate is made equal. In addition, the side of each valve plate is always opened and closed while being in contact with the side of the adjacent valve plate without overlapping.

When the concentric opening S is formed in each valve plate 10 in one operation step, the valve driving shaft 11 has a bisector C of the apex angle α of the valve plate.
The valve is opened / closed as shown in FIG. 2 by mounting the shaft in a direction orthogonal to and pushing and pulling the shaft by the cylinder 12. In FIG. 2, the broken line indicates the state where the valve plate 10 is fully closed, and the arrow indicates the opening direction of the valve plate 10.

FIG. 3 shows the shape of the opening S and the state of the opening / closing operation when the valve plate 10 is composed of six sheets. The solid line shows the valve plate 10 open, and the broken line shows the valve plate 10 closed.

The arrow indicates the opening direction of the valve plate 10.

An example of a driving method for driving each valve plate in one operation step is a system by a hydraulic cylinder 12 using a hydraulic circuit having a tuning function as shown in FIG. 1, or a driving shaft as shown in FIG. The rack 13 is fixed to the end of 11, the gear 14 is meshed with the rack, and the gear 14 is rotated to drive the drive shaft. The gear 14 includes a shaft 15, a gear 16,
Rotational force is transmitted from a rotary drive source 19 such as an electric motor via the turning ring 17 and the gear 18. In this system, since the rotation of one swivel ring 17 simultaneously moves the racks 13 of the respective valve plates 10, synchronism is ensured. Note that only during the transition period when the flow control valve is open, if the concentricity of the opening shape is ignored, each valve plate is not in one operation step, and the number of valve plates is even as shown in Fig. 5 (A) (B). At the same time, by increasing the driving direction, concentric opening is possible even in two or more operation steps.

As an example, FIG. 5 (A) shows the first operation step when four valve plates are used, and FIG. 5 (B) shows the second operation step. The same operating principle can be applied to a spherical valve plate.

(Effect of the Invention) As described above, in the present invention, the state of charging the raw material from the raw material hopper to the in-core shout is always made to flow around the core, so that the disturbance factor in the distribution control of the internal charge of the furnace is removed. The charging distribution can be easily controlled. As a result, the degree of freedom in operating the blast furnace is greatly improved, and the effect on the productivity and economic efficiency of the blast furnace is extremely large.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a flow rate control valve of a furnace top charging apparatus according to the present invention, FIGS. 2 and 3 are opening operation diagrams of flow rate control valves of a furnace top charging apparatus according to the present invention, and FIG. Another embodiment of the drive device for the furnace top charging device according to the present invention, FIGS. 5 (A) and 5 (B) are other opening operation diagrams of the flow control valve of the furnace top charging device according to the present invention, and FIG. Fig. 7 is an example of a conventional furnace top charging device, Fig. 7 is a conceptual diagram of the raw material flow in the conventional furnace top charging device, Fig. 8 is an improved example of the conventional furnace top charging device, and Fig. 9 (A ) (B) is an example diagram of a flow control valve and a conceptual diagram of a raw material flow in a conventional improved furnace top charging device. 1 ... In-furnace shout 2 ... Flow rate control valve 3 ... Raw material hopper 4 ... Collective shut 5 ... Raw material charging belt conveyor 6 ... Seal valve 7 ... Furnace core 8 ... Apex 9a, 9b ... Valve Plate 10: Valve plate α: Vertical angle a: Horizontal velocity component C: Bisecting line 11 ... Valve plate driving shaft 12 ... Cylinder 13 ... Rack 14 ... Gear 15 ... Shaft 16 …… Gear 17 …… Swirl ring 18 …… Gear 19 …… Drive source S …… Aperture of flow control valve b …… Horizontal velocity component l, l ′ …… Sliding distance on the in-furnace sheath

Claims (1)

[Claims] 1. A bellless furnace top device for charging a raw material stored in a raw material hopper 3 into the furnace through a flow rate control valve 2 provided in a lower portion of the hopper and a swirling shout 1 provided in the furnace. In the flow control valve, the apex angle α is equal to 3
It is composed of more than one valve plate 10, and when fully closed, the apex 8 of the valve plate coincides with the core of the furnace, and when forming the opening S, it can move back and forth so that the sides of adjacent valve plates come into contact with each other. Configured to
Bellless furnace top charging device characterized in that the size of the opening S formed on the side of each valve plate is variable