JPH0120632Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a raw material charging device used when ore and auxiliary raw materials are reduced from the top of a blast furnace, or when pellets or lump ore are reduced in a shaft furnace. .

(Prior art) For example, as a top charging device for a blast furnace, there is a No.
As described on pages 293 to 294, there are bell-type, bucket-type, and bellless-type charging devices.

The bell type consists of a bell and a swing hopper with a chute and a gate at the bottom, and the gas seal is said to be the swing part and the gate part.

The bellless type seals the gas with a two-stage seal valve, and distributes charging by continuously rotating a rotating chute installed in the furnace.By changing the inclination angle of the rotating chute, the radius of the furnace can be adjusted. It is possible to control the distribution of directions.

(Problems that the invention aims to solve) The bell-less type is attracting attention because the gas seal is incomplete and the uniformity of the distribution in the furnace is not very good.
There is a problem in that the drive device for continuously rotating the swing chute is extremely complex in structure.

In addition, regarding shaft furnaces, the above-mentioned publication No. 331
As stated on page 333 from page
It was not possible to change the raw material charging position in the radial direction of the furnace.

(Means for solving the problem) The present invention is a furnace top charging device that can greatly change the degree of freedom of raw material charging despite the simplified drive mechanism. In the present invention, a vertical chute is provided at the top of a furnace such as a blast furnace or a shaft reduction furnace, penetrating into the furnace, and a raw material distributor is provided vertically below the vertical chute. A vertical furnace characterized in that the body is rotatably supported around the furnace central axis via a support, and a variable speed drive mechanism is provided for rotating the raw material distribution body around the furnace central axis. It provides a device for charging raw materials from the top of the furnace.

(Example) Embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a furnace top, and a vertical chute 2 for charging raw materials is provided on the furnace center line, and the vertical chute 2 is inserted into the furnace.

A horizontal support plate 3 is fixed near the lower end of the vertical chute 2, and a through hole 4 is provided in the center of the support plate 3.
is formed in the vertical direction, and the lower end of the vertical chute 2 is exposed below the center of the through hole 4.

Reference numeral 5 denotes a distributor, which is in the shape of a self-lining disc made of heat-resistant, wear-resistant steel, etc., and its upper surface side is formed with a tapered surface 6 that expands downward from the center of the furnace axis, and the tapered surface 6 Feathers 7 are fixed on the top in a radial arrangement, and the lower ends of supports 8 are fixed to the feathers 7, and the upper ends of the supports 8 protrude upward from the through hole 4, and further protrude outward in the radial direction. A ring gear 9 is attached to the outer periphery of the projecting portion.

Furthermore, rolling elements 10 are provided on the lower surface of the overhang portion in correspondence with each support 8, and the rolling elements 10 are mounted on the support plate 3, where the distributor 5 can freely rotate around the furnace axis. is supported by

11 is a variable speed drive mechanism, and a ring gear 9
It is comprised of a pinion gear 12 engaged with the pinion gear 12, a shaft 13 of the pinion gear 12, and a variable speed motor 14 connected to the shaft 13 via a coupling (not shown) or the like.

(Function) When raw materials are charged through the vertical chute 2, they collide and fall into the center of the distributor 5, and since the upper surface of the distributor 5 has a tapered surface 6, the raw materials are dispersed radially outward. be done.

Furthermore, when the motor 14 of the variable speed drive mechanism 11 is started, the ring gear 9 is driven via the pinion gear 12, and the distributor 5 supported via the support 8 is rotated around the furnace axis, and the centrifugal force accompanying this rotation is The releasing force of the feather 7 makes it possible to uniformly disperse the raw material throughout the entire radial direction of the furnace.

In particular, by changing the speed of the variable motor 14, charging can be performed at any position in the radial direction of the furnace.

FIG. 3 shows, as an example, the falling locus of the raw materials charged in the furnace while changing the rotational speed of the distributor 5.

These trajectories were calculated using the following theoretical formulas.

The movement of particles on the distributor 5 is expressed by equations (1) and (2).
In addition, the motion of particles falling from the tip of the distributor 5 is expressed by the formula
It was calculated using (3) and (4).

d ² L/dt ² =Fg−Fc+Fr−Ff ……(1) d ² θ/dt ² =Fc+Fr−Ff ……(2) d ² x/dt ² =0 ……(3) d ² y/dt ² = Fg ...(4) where, L: Distance in the longitudinal direction of the chute (m) θ: Distance in the tangential direction of the inner surface of the chute (m) x: Distance in the horizontal direction of the furnace (m) y: Vertical distance of the furnace Distance in direction (m) t: Time (sec) Fg: Gravity (m/sec ² ) Fc: Coriolis force (m/sec ² ) Fr: Centrifugal force (m/sec ² ) Ff: Frictional force (m/sec ² ) As is clear from FIG. 3, as the rotational speed of the distributor 5 increases, the flying distance in the horizontal direction increases, and the raw material can be charged over a considerably wide area in the radial direction.

Although this calculation example does not show the falling trajectory from the middle part of the furnace to the center, by optimizing the diameter and slope angle (tapered surface angle) of the distributor 5, raw materials can be loaded near the center. You can enter.

(Effects of the invention) According to the invention, the rotation speed of the distributor 5 provided on the furnace shaft inside the furnace top can be made variable, so the drive device can be simplified compared to the conventional bellless type. Manufacturing costs are also low and maintenance is easy.

Further, the distributor 5 can be made smaller than a rotary chute, the production cost is low, and replacement is easy.

Furthermore, the material dispersion or distribution function in the radial direction of the furnace is extremely superior to that of the Bell type, and a new material deposit layer can be easily obtained in the radial direction of the furnace.

Therefore, it is very useful as a furnace top charging device for vertical furnaces such as blast furnaces and shaft furnaces.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the top of the furnace, FIG. 2 is a plan view of the distributor, and FIG. 3 is an explanatory view showing the trajectory of the charged raw material. 1...Furnace top, 2...Vertical chute, 5...Distributor, 8...Support, 11...Variable speed drive mechanism.

Claims (1)

[Scope of utility model registration request] A vertical chute 2 is provided at the center of the furnace top 1 of a blast furnace, shaft reduction furnace, etc., penetrating into the furnace, and a raw material distributor 5 is provided vertically below the vertical chute 2. A vertical furnace, which is rotatably supported around the furnace central axis via a support 8, and is provided with a variable speed drive mechanism 11 for rotating the raw material distribution body 5 around the furnace central axis. A device for charging raw materials from the top of the furnace.