JPH02182811A - Furnace top charging apparatus in bellless blast furnace having preventing facility to channeling flow - Google Patents

Abstract

PURPOSE:To always drop raw material into swinging center of a swinging chute by arranging a repulsive plate as possible to advance/retreat toward inner part of a vertical chute from inner wall face of the vertical chute at the position facing to discharging hole of a furnace top bunker in the vertical chute. CONSTITUTION:The raw material 11 discharged from the furnace top bunker 1 is slid on a collecting chute 8 and sent in the vertical chute 3 and supplied into the swinging chute arranged below the vertical chute 3. Then, at the position where the flow of the raw material 11 collides against the wall face in the vertical chute 8 the repulsive plate 5 is arranged as facing to the position 10 of discharging hole of the bunker 1. This repulsive plate 5 is fitted to the driving shaft 7 penetrating a gas sealing part 6 and made to be possible to advance/retreat with a driving motor 7a. By adjusting the advancing/retreating rate of the repulsive plate 5 with this motor 7a, the raw material is always dropped into swinging center of the swinging chute and nonuniformity of the temp. in circumferential direction in the furnace is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a top charging device for a pelletless blast furnace having a function of preventing drift of contents in the furnace.

[Prior Art] FIG. 2 is a diagram showing an example of the occurrence of ore/coke (0/C) distribution deviation in the inner peripheral direction of the blast furnace, which is caused by charging raw materials into the blast furnace. Blast furnace charging equipment.

Multiple furnace m bunkers 1.2 and vertical chute 3 installed opposite each other
and a turning chute 4 that can change direction. When raw materials are charged through this charging device, the following problems occur.

The raw material passing through the vertical chute 3 selects different positions within the vertical chute as a fall route depending on which furnace top bunker 1.2 it is discharged from, resulting in a drifted flow. For this purpose, the falling raw materials are transported through the rotating chute 4
Since they fall at different positions on the chute, the distance traveled on the chute is di, d2. As a result, the travel time, material falling speed leaving the chute, and falling trajectory change, and ultimately the deposition position in the furnace changes, resulting in a deviation in the distribution of the charge in the direction of the furnace circumference in the charge layer. , leading to deviations in the O/C distribution, especially as seen in the profile of FIG.

As can be seen from the above explanation, if ore is cut from one of the two top bunkers 1 and 2 and coke is cut from the other, and this continues alternately, a large deviation occurs in the O/C distribution in the circumferential direction. Cause.

In order to solve these problems, Japanese Utility Model Publication No. 59-5725 discloses a charging device in which two hoppers having discharge ports are disposed vertically on the central axis of the furnace. Although this device eliminates the unbalance in the two circumferential directions, the charging speed decreases. Furthermore, since the height of the device increases, there is a problem in that the equipment cost increases.

Further, in Japanese Patent Publication No. 61-30993, a cut gate is provided to restrict the flow in the vertical chute so that the raw material falls onto the central axis of the furnace. Japanese Patent Application Laid-Open No. 53-102808 discloses a method for preventing drifting by installing a cone on the top of a vertical chute. All of these techniques attempt to control the falling trajectory of the raw material by significantly narrowing the flow path through which the raw material falls.

[Problems to be Solved by the Invention] When the falling flow path of raw materials is narrowed, a problem arises in that ore and coke are suspended on the cut gate and cone. In order to effectively drop the raw material onto the concentric axis, it is necessary to significantly narrow down the falling flow channel so that the raw material flows in a clogged state. If the flow path is narrowed, clogging is likely to occur when the flow of the raw material deteriorates due to fluctuations in the moisture content of the raw material, making it difficult to stably control the supply of raw material to the blast furnace.

The present invention consists of a plurality of furnace top bunkers arranged in parallel, a vertical chute that guides the raw materials discharged from these bunkers, and a rotating chute that receives fallen materials from the vertical chute and swirls and scatters them into the blast furnace. In the charging device, by controlling the falling trajectory of the raw material without restricting the flow path,
The purpose is to supply raw materials to the blast furnace along the central axis of the furnace, thereby solving the problems of the above-mentioned pelletless blast furnace.

[Means for Solving the Problems 1] The present invention provides a rubbing plate that can move forward and backward from the inner wall surface of the chute toward the inside of the vertical chute, at a position facing the top bunker discharge port on the inner wall surface of the vertical chute. It is characterized by

Another aspect of the present invention is a plurality of furnace top bunkers arranged in parallel, a collection chute that guides the discharged raw materials from the bunkers toward the core, and a vertical chute that receives the raw materials from the collection chutes and drops them downward. In the pelletless charging device, the collecting chute is provided with a guide groove leading to the vertical chute under each furnace top bunker, and the collecting chute is provided with a guide groove leading to the vertical chute under each furnace top bunker. A notch-shaped guide notch is provided at the inlet of the vertical chute, and the vertical chute has a groove at a different vertical height below each position where the raw material discharged from each furnace top bunker collides with the inner wall surface of the vertical chute. It is characterized by protrusions protruding from the wall surface 6. [Function] In conventional equipment, the presence of a horizontal velocity component that occurs when the charging material discharged from the bunker flows through the collecting hopper deteriorates the circumferential balance. It was the cause.

In the present invention, a repelling plate that can move forward and backward is provided on the wall of the vertical chute, and its position can be adjusted for each bunker so that falling objects are not unevenly distributed in the furnace. This makes it possible to adjust the flow path of the charged raw material for each bunker and supply the raw material to the center of rotation of the rotating chute. This repulsion plate does not narrow the raw material passage.

In addition, in the second invention of the present invention, the raw materials discharged from each bunker are guided into the groove by the collecting chute, the falling flow path is regulated by the notch at the entrance of the vertical chute, and the raw material hits the wall of the vertical chute, and the material is at the reversing position. A protrusion was provided at the bottom to correct the falling path. As a result, the falling path of the charged material can be directed toward the center of rotation of the rotating chute.

[Embodiment 1 Figure 1 shows an embodiment of the apparatus of the present invention, and is (a) a plan view and (b) a longitudinal sectional view. The raw material 11 discharged from the bunker 1 slides on the collecting chute 8 and passes through the vertical chute 3.
and is supplied to a rotating chute (not shown) located below. A repulsion plate 5 is provided at a position where the flow of the raw material collides with the wall surface of the vertical chute 3. Figure 1(a)
As shown in FIG. 1, they face the discharge port position 10 of the bunker 1, and if there are three bunkers, three repulsion plates are provided.

The repulsion plate 5 is attached to a drive shaft 7 passing through the gas seal portion 6, and can be moved forward and backward by a drive motor 7a.

The drive motor 7a adjusts the amount of movement of the repulsion plate 5 so that the raw material 11 always falls at the center of rotation of the rotation chute.

FIG. 3 shows another embodiment of the present invention, in which a guide groove 13 provided in a collecting chute 8 guides the raw material flow discharged from the bunker l.
, and a notch 14 provided at the upper end of the vertical chute 3, the grains are sorted into a unidirectional flow and fed into the vertical chute 3.

A protrusion 12 is provided in the vertical chute 3 below the position where this supply flow hits the wall to adjust the path of the falling flow. The protrusions 12 have different vertical height positions within the vertical chute 3,
This is to prevent the vertical chute from clogging and causing accidents.

Normally, the raw material that collides with the protrusion 12 changes direction and flows in the direction of the protrusion slope. Therefore, by appropriately selecting the position of the projection and the slope of the slope of the projection, it is possible to drop the raw material onto the rotating shaft of the rotating chute.

Next, the effects of the embodiment will be explained with reference to FIG.

Furnace volume: 2580rrl Number of furnace top bunkers installed: 3 Air flow rate: 400ONrr?/hr Invention 1.2 of the present invention was implemented in a blast furnace with an iron production ratio of 21.6.Putting the 1st invention into practice At this time, the second invention was first implemented, and after confirming the effect shown in FIG. 4, the first invention, which was a major modification, was implemented.

As a result: (1) The deviation in the circumferential direction of the skin flow thermometers installed at eight locations in the circumferential direction was reduced. Figure 4 shows the change in the deviation of 8 skin flow thermometers, which shows the uniformity in the circumferential direction of the upper part of the furnace.After adopting the 0-point method, the deviation decreased rapidly to about 1/1.
It is 3.

■ Fluctuations in Si during tapping were suppressed.

As shown in Figure 4, the fluctuations in [Si] in the hot metal have decreased, indicating that the non-uniformity in the circumferential direction has been eliminated by adopting the single method.5 ■ It is possible to suppress fluctuations in the tapping temperature. became.

For this reason, there is less variation even at the lower end of the conventional variation, that is, the lowest tapping temperature. That is, as shown in FIG. 4, since the fluctuation in hot metal temperature has decreased, the average hot metal temperature can be lowered, and the hot metal temperature has decreased to about 1493°C. As a result, [Si] decreased by 0.2%, which has a significant economic effect.

[Advantageous Effects of the Invention 1] According to the present invention, it is possible to eliminate the non-uniformity of temperature in the circumferential direction inside the furnace, which is peculiar to a parallel bunker type perleless blast furnace. As a result, it has become possible to eliminate deviations in hot metal [S i ] and hot metal temperature for each taphole.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the present invention, in which (a) is a plan view of a vertical chute, (b) is a vertical cross-sectional view thereof, and FIG. FIG. 4 is an explanatory diagram of the embodiment of Haku, in which (a) is a plan view of a vertical chute, (b) is a longitudinal sectional view thereof, and FIG. 4 is a graph showing the effects of the present invention. l, 2...-Furnace top bunker 3...-Vertical chute 4...-Swivel chute 5--Movable rubbing plate 6...Gas seal portion 7...Drive shaft 7a...-Drive motor

Claims (1)

[Scope of Claims] 1. A plurality of furnace top bunkers arranged in parallel, a vertical chute that guides the raw material discharged from the bunkers downward, and a rotating system that receives fallen materials from the vertical chute and swirls and scatters them into the blast furnace. A perleless charging device consisting of a chute is characterized in that a rubbing plate is provided on the inner wall of the vertical chute at a position facing the furnace top bunker outlet, and is movable forward and backward from the inner wall of the chute toward the inside of the vertical chute. A furnace top charging device for a pelless blast furnace that has a drift prevention function. 2. A plurality of furnace top bunkers arranged in parallel, a collection chute that guides the discharged raw material from the bunkers toward the core, a vertical chute that receives the raw material from the collection chute and drops it downward, and a In a pelletless charging device consisting of a rotating chute that receives falling objects and swirls and scatters them into the blast furnace, the collecting chute is provided with a guide groove leading to the vertical chute below each furnace top bunker, and a notch-shaped groove at the entrance of the vertical chute. A guide notch is provided, and the vertical chute has projections protruding from the wall surface at different vertical heights below the respective positions where the raw material discharged from each furnace top bunker collides with the inner wall surface of the vertical chute. A furnace top charging device for a pelletless blast furnace having a drift prevention function.