JPH05214454A - Firing method of sintered ore - Google Patents

Abstract

PURPOSE:To achieve uniform firing in the width direction of a pallet in the firing of the sintered ore. CONSTITUTION:In the firing method of the sintered ore where the raw material 22 which is fallen from a surge hopper 21 into a sloping chute 25 through a divided gate by means of a roll feeder 24 and charged on a pallet moving in the horizontal direction is leveled by a cut-off plate 27, and at the same time, firing of the sintered ore is achieved while improving the air penetration by means of a plow blade-shaped member 3 inserted in the raw material layer, the individual blades forming the plow blade part of the plow blade-shaped member 3 are constituted to be independently movable in the vertical direction, the air penetration is adjusted by changing the depth of the individual blades of the plow blade inserted in the raw material, the temperature at the bottom of the grate in the respective position in the width direction is set to the preset value, and the uniform firing of the raw material is achieved in the width direction of the grate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for firing sinter,
In particular, it relates to a firing method capable of firing uniformly in the great width direction.

[0002]

2. Description of the Related Art Conventionally, when firing a sintered ore, FIG.
The method is disclosed in Japanese Patent Publication No. 63-9572. That is, the raw material 22 in the surge hopper 21 is supplied from the split gate 23 attached to the lower portion of the surge hopper 21 onto the roll feeder 24 that continuously rotates in one direction. The division gate 23 is divided into a plurality of pieces, and each of the gates is configured so that its opening can be adjusted independently. The raw material 22 drops from the roll feeder 24 onto the sloping chute 25, slides on the sloping chute 25, and is loaded onto a pallet 26 that moves in the horizontal direction. The raw material 22 charged in the pallet 26 is leveled by the cutoff plate 27 attached to the lower part of the sloping chute 25.

In addition to the above-described structure, as shown in FIG. 5, a plow blade member 28 having a tip buried in the raw material is arranged in front of the cutoff plate 27 and below the sloping chute 25. By forming a gap in the raw material 22 at the part of the plow blade 28a, the air permeability is improved and the firing of the raw material 22 proceeds smoothly.

It is desirable that the charging density of the raw material 22 charged into the pallet 26 be the same at any position in the width direction in order to carry out uniform firing. Therefore, in the prior art, as shown in FIG.
A plurality of densitometers 29 are provided corresponding to the respective gates 3 and the density of the raw material 22 deposited on the pallet 26 is measured by the densitometers.

This density is different from the usual concept of density, and as shown in the explanatory view of FIG. 6, the distance from the density meter 29 to the cutoff plate 27 is l ₁ , and the density meter 29 is placed on the pallet. The distance to the surface of the deposited raw material 22 is l ₂
Is expressed by the equation (1). Density (%) = 100 (1- l 2 / l 1) (1)

That is, when the raw material 22 is deposited only up to the lower end of the cut-off plate 27, the density becomes 0%, and the more it is deposited, the higher the density becomes. Then, for example, if the measured density distribution is as shown by the solid line in the graph of FIG. 7, the opening degree of each gate of the split gate 23 may be adjusted so that the density distribution becomes as shown by the dotted line. It was

[0007]

However, the above-described conventional sintering ore firing method has the following problems. That is, the particle size distribution of the raw material in the surge hopper varies depending on the location, and even if the raw material density in the width direction on the pallet 26 is the same, if the particle size distribution in the width direction is different, the firing rate of the raw material is different, As shown in the graph of FIG. 8, the temperature distribution below the grate at a certain position differs in the width direction, that is, there is a problem that uniform firing cannot be performed in the width direction.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a method for calcination of sinter that enables uniform calcination in the width direction of a pallet. .

[0009]

The method for firing sinter according to the present invention is a raw material which is dropped from a surge hopper by a roll feeder to a sloping chute through a split gate and is charged on a horizontally moving pallet. , In the firing method of the sinter ore, which is smoothed with a cut-off plate and fired while improving the air permeability with a plow blade-shaped member inserted in the raw material layer, in which the plow-blade part of the plow-blade member is formed individually. The blades are individually configured to be movable in the vertical direction, and the air permeability is adjusted by changing the depth of each blade of the plow blade inserted in the raw material, and the grate lower temperature at each position in the width direction is adjusted. The temperature is set in advance so that the firing of the raw material in the width direction is made uniform.

[0010]

In the firing method for sinter according to the present invention,
Even if the uniform firing in the width direction is broken because the particle size distribution of the raw materials inserted in the pallet is different, the grate lower temperature at each position in the width direction is measured and the grate lower temperature is preset. The insertion depth of the individual blades of the plow blade member is adjusted so as not to separate from the temperature. That is, when the measured temperature is higher than the set temperature, the blade insertion depth is made shallow to reduce the air permeability to suppress the progress of firing, and when the measured temperature is lower than the set temperature, the blade insertion depth is reduced. The depth is increased to improve the air permeability and accelerate the progress of firing.

As described above, in the method of firing the sintered ore according to the present invention, the temperature below the grate at each position in the pallet width direction is adjusted so as to reach a preset temperature. Even if the particle size distribution of the raw materials differs in the width direction, uniform firing can be performed.

[0012]

EXAMPLE FIG. 1 shows a method of firing a sintered ore according to an example of the present invention.
It will be explained based on. FIG. 1 (a) is an explanatory diagram showing a method of firing a sintered ore according to one embodiment of the present invention, in which a roll feeder 24 causes a surge hopper 21 to a split gate 23.
In the firing method of the sintered ore, in which the raw material 22 dropped on the sloping chute 25 and charged on the horizontally moving pallet 26 is evenly fired by the cut-off plate 27, As shown in FIG. 1B, a plow blade-shaped member 3 is arranged so that each blade 1 can be moved up and down by an air cylinder 2.

The individual blades 1 of the plow blade member 3 described above are
It is inserted in the 22 layers of raw material loaded on the pallet 26, and the insertion depth can be adjusted by operating the air cylinder 2. And raw material 2
When the particle size of 2 is large, the air flow is good and the firing rate is too fast, the insertion depth is made shallow to slow the firing rate,
When the grain size of the raw material 22 is small and the air flow is poor and the firing rate is too slow, the insertion depth can be made shallow to increase the firing rate.

FIG. 2 is an explanatory view showing a method of controlling the raw material on the pallet 26 by the above-mentioned blade member 3 so that the raw material is uniformly baked in the width direction. The temperature difference calculator 5 receives temperature signals from a plurality of thermometers 4 provided in the width direction under the grate.
And the difference between the preset value and the measured value at each preset position in the width direction is calculated. Then, the calculated difference signal is sent to the insertion depth calculator 6, and the insertion depth is calculated on the basis of a preset arithmetic expression indicating the relationship between the temperature difference and the insertion depth. The signal of the calculated insertion depth is sent to the controller 7, and the controller 7 causes the plowed blade-shaped member 3 to move.
The insertion depth of the individual blades 1 of is controlled.

FIG. 3 is a graph showing the temperature distribution in the width direction under the grate. In the above control, the temperature distribution shown by the solid line is changed to a uniform temperature in the width direction as shown by the dotted line. The material is distributed so that the baking of the raw material in the width direction is made uniform.

[0016]

EFFECTS OF THE INVENTION According to the present invention, the firing of the sintered ore can be performed uniformly in the width direction, the strength of the ore is increased, and the yield is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a method for firing a sintered ore according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a method of controlling the insertion depth of a plow blade in the method for firing a sintered ore according to an embodiment of the present invention.

FIG. 3 is a graph showing the temperature distribution in the width direction under the grate before and after the control.

FIG. 4 is an explanatory diagram showing a conventional method for firing sintered ore.

FIG. 5 is an explanatory view showing a mounting state and a shape of a conventional plow blade member.

FIG. 6 is an explanatory diagram showing the concept of density.

FIG. 7 is a graph showing the distribution of raw material density in the width direction.

FIG. 8 is a graph showing that the under-grate temperature differs in the width direction.

[Explanation of symbols]

 1 Blade 2 Air Cylinder 3 Plowed Blade 4 Thermometer 5 Temperature Difference Calculator 6 Insertion Depth Calculator 7 Controller

Claims (1)

[Claims] 1. A raw material, which is dropped from a surge hopper through a split gate to a sloping chute by a roll feeder and is charged on a horizontally moving pallet, is leveled by a cut-off plate and inserted into a raw material layer. In a method of firing a sinter that burns while improving air permeability with a plowed blade member, the individual blades forming the plowed blade portion of the plowed blade member are individually configured to be vertically movable, and The breathability is adjusted by changing the depth of each of the inserted plow blades, and the grate lower temperature at each position in the width direction is set to a preset temperature, and the grate width direction is adjusted. A method for firing a sintered ore, characterized by uniformly firing a raw material.