JPS6124447B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a top charging device for a blast furnace. By eliminating the vertical hopper and using a horizontal hopper, the height of the top charging device can be significantly lowered, and the material can be easily transferred into the furnace. This was done with the aim of increasing the controllability of the amount of cut out, and also preventing the raw material from becoming powder due to falling collisions, thereby increasing the operability of the furnace.

As a typical conventional furnace top charging device, there is one shown in FIGS. 1 and 2, for example. That is, the one in Fig. 1 is a valve seal type furnace top charging device, in which the raw material transported by the charging conveyor a is once stored on the gate c of a fixed hopper b that communicates with the atmosphere. The raw material was distributed through a distributor g to a small bell hopper f, which was configured to perform gas sealing and equalize pressure by a seal valve d provided at the top and a small bell e at the bottom, and was further equipped with a large bell h. It is designed to be charged into the furnace j via a large bell hopper i. The one in Figure 2 is a top charging device without a bell, and while the one in Figure 1 has a fixed hopper, a small bell hopper, and a large bell hopper arranged vertically in series in that order, the one in Figure 1 has a fixed hopper, a small bell hopper, and a large bell hopper arranged vertically in this order. The raw material hoppers k and k' are equipped with an upper seal valve l and a lower seal valve m so as to be able to equalize and discharge the pressure.
The raw material conveyed by the charging conveyor a is pressure-adjusted by the pressure equalization equipment of the raw material hoppers k and k', and is then passed through the charging port n and the raw material distributor o into the furnace j.
It is now being distributed and charged.

However, in each of the above-mentioned conventional examples, each hopper provided in each conventional example is a temporary raw material reservoir, in which the raw material is charged from above, deposited sequentially, and cut out from the lower part when the charging is completed. Since the discharge structure relies on gravity falling, the lower cutting section, the depositing section, and the upper raw material input section are arranged vertically, and the height of the raw material charging device is therefore very high. Due to the high height of the machine, in the conventional example, the cost of equipment for transporting raw materials from the ground, furnace top turret, rising pipes, and descending pipes increases, and furthermore, the free falling of raw materials can cause collisions. In addition to the equipment in the furnace being worn out, the raw material is powdered and the gas flow between the raw material particles in the furnace is poor, resulting in poor blast furnace operability. Furthermore, as mentioned above, the abrasion and pulverization phenomena due to falling impact of raw materials are 5 to 10 times greater than when they rub against each other, and because it is a function of impact energy, the higher the falling height, the more significant the phenomenon. Ta.

The present invention was made in an attempt to solve the problems of the above-mentioned conventional method.A gas seal metal fitting is provided at the top of the blast furnace, and a gas seal metal fitting is provided on the side of the gas seal metal fitting.
It has a truncated cone shape, and is supported so that its bottom is lower on the small diameter side than on the large diameter side, and is rotated around its axis by a rotational drive device. A horizontal hopper is provided, the small diameter side end of the horizontal hopper is connected to the seal hardware via a rotatable gas seal and a seal valve, and the large diameter side end is connected to a rotatable gas seal and a seal valve. This relates to a rotary furnace top charging device characterized in that it is connected to the raw material supply side via a rotary furnace top charging device.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, a charging hole 3 for dropping raw materials is provided on a distribution chute 2 provided in the upper part of the furnace interior 1, and the upper part of the charging hole 3 is provided with a gas It is hermetically surrounded by a metal seal 4. At a side position of the gas seal hardware 4, there is a horizontal hopper 5 in the shape of a truncated cone, with a support roller 6,
6'. The small-diameter end of the horizontal hopper 5 is connected to the gas seal metal fitting 4 in a state where it is kept airtight even when rotated by a gas seal 7, and is connected to a raw material receiver provided inside the gas seal metal fitting 4. The small-diameter end can be opened and closed by a tool 8 and can be closed airtight by an internal seal valve 9. A ring gear 10 is fixed to the outer periphery of the intermediate portion of the horizontal hopper 5, and a pinion gear 11 that meshes with the ring 10 and a motor 12 that drives the pinion gear 12 are provided to constitute a rotational drive device. 12, the horizontal hopper 5 can be rotated about its axis while being supported by the support rollers 6, 6'. Further, a raw material supply pipe 14 is rotatably connected to the axial center of the large-diameter end of the horizontal hopper 5 via a gas seal 13, and the raw material supply pipe 14 is bent vertically upward. An external seal valve 15 is provided at its upper end, and a raw material receiving portion 16 is provided above the external seal valve 15. Further, a distribution conveyor 19 is provided between the material receiving portion 16 and a charging chute 18 provided at the lower end of the charging conveyor 17 that transports the material from the ground. When the distribution conveyor 19 includes a plurality of horizontal hoppers (in the illustrated embodiment, two hoppers 5 and 5' are provided symmetrically about the furnace axis 20), the raw material receiving portion 16 and the furnace shaft 20, and by switching its driving direction, raw material can be distributed to the horizontal hoppers 5, 5'. Therefore, when only one horizontal hopper is provided, the length of the distribution conveyor can be half of the above-mentioned length, and when three or more horizontal hoppers are provided, the length of the distribution conveyor is set around the furnace shaft 20. A distribution method may be used in which the distribution system is rotated around 20. In the figure, 8' is a raw material receiver, 9' is an internal seal valve, and 21 is a raw material.

Next, the operation of the present invention will be explained.

As shown in Fig. 3, the raw material 21 is placed in the horizontal hopper 5.
To explain the case of charging the horizontal hopper 5, first close the raw material receiving device 8 and the internal seal valve 9, then open the external seal valve 15 on the raw material supply side to exhaust the internal pressure of the horizontal hopper 5, and then release the horizontal hopper 5. While the motor 12 is driven to rotate at an appropriate speed, the raw material from the charging conveyor 17 is introduced via the distribution conveyor 19 and the raw material supply pipe 14. The raw material 21 charged in this manner is mixed by the rotation of the horizontal hopper 5, moves horizontally, and is gradually deposited from the small diameter side end. Also, while this operation is being carried out, the raw material receiver 8' and the internal seal valve 9' of the horizontal hopper 5' are opened, and the raw material that has already been put into the container is opened.
It is charged into the furnace 1 through a charging hole 3 and a distribution chute 2.

Next, the case where the raw material 21 charged into the horizontal hopper 5 is charged into the furnace 1 will be described. With the external seal valve 15 closed and the horizontal hopper 5 rotated by the drive of the motor 12, The raw material stopper 8 and the internal seal valve 9 are opened. At this time, the charging of the raw material from the horizontal hopper 5' has already been completed, the raw material stopper 8' and the internal seal valve 9' are closed, and the next raw material is charged. The raw materials from the horizontal hopper 5 are uniformly mixed without segregation due to the rotation of the horizontal hopper 5, and are distributed into the furnace 1 through the charging port 3 and the distribution chute 2. At this time, the charging of the raw material can be controlled by adjusting the rotational speed of the horizontal hopper 5.

When the charging of raw materials into the horizontal hopper 5 is completed,
After the small-diameter end of the horizontal hopper 5 is closed by closing the raw material stopper 8 and the internal seal valve 9, the internal pressure of the horizontal hopper 5 is exhausted by opening the external seal valve 15. Subsequently, the above operation is repeated, and raw materials are alternately charged via the horizontal hoppers 5, 5'. In this way, it is possible to charge the raw material almost continuously, but by simultaneously charging the raw material from a plurality of horizontal hoppers 5, 5',
It is also possible to eliminate the phenomenon that the raw materials in the furnace are shifted due to the flow direction of the raw materials. As mentioned above, by forcibly moving the raw material in the horizontal direction using the horizontally placed hoppers 5 and 5', which are horizontally placed and rotated, the fixed hopper in the conventional example shown in FIG. By omitting the bell hopper and the raw material hopper in the conventional example shown in FIG. 2, the height of the top charging device of the blast furnace can be significantly reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and that various types of seal structures and raw material conveying means can be adopted, and that the number of horizontal hoppers installed can be varied. Of course, a device for adjusting the raw material charged from the horizontal hopper may also be provided.

According to the above-mentioned rotary furnace top charging device of the present invention, (i) the hopper for charging the raw material is a horizontal hopper that forcibly transports the raw material in the horizontal direction by rotation; The height of the machine can be significantly lowered, and the cost of equipment such as raw material transport equipment, furnace top turret, riser pipes, downcomer pipes, etc. can be significantly reduced.

(ii) Powdering caused by falling raw materials is reduced, gas flow between raw material particles in the furnace is improved, and the operability of the blast furnace is improved.

(iii) There is less damage to the furnace top equipment due to wear during material collision.

(iv) By rotating the horizontal hopper, segregation of raw materials can be eliminated and raw materials can always be charged in a uniformly mixed state.

(v) The charging of raw materials can also be controlled by controlling the rotational speed of the horizontal hopper.

etc., exhibits various excellent effects.

[Brief explanation of the drawing]

Figures 1 and 2 show typical conventional furnace top charging equipment; Figure 1 is a valve seal type, Figure 2 is a bellless type, and Figure 3 is an embodiment of the present invention. It is an explanatory diagram showing an example. 1 is inside the furnace, 3 is charging hole, 5, 5' is horizontal hopper, 6, 6' is support roller, 7, 13 is gas seal, 8, 8' is raw material receiver, 9, 9' is inside 10 is a ring gear, 11 is a pinion gear, 12 is a motor, 15 is an external seal valve, 17 is a charging conveyor, and 19 is a distribution conveyor.

Claims (1)

[Claims] 1. A gas seal metal fitting is provided at the top of the blast furnace, and supported on the side of the gas seal metal fitting so that it has a truncated conical shape and its bottom is lower on the small diameter side than on the large diameter side. However, a horizontal hopper is provided which is rotated around its axis by a rotary drive device, and the small-diameter end of the horizontal hopper is connected to the seal metal fitting through a rotatable gas seal and a seal valve. A rotary furnace top charging device characterized in that the large diameter side end is connected to the raw material supply side via a rotatable gas seal and seal valve.