JPH0820824A - Device for controlling air permeability in sintering machine - Google Patents

Abstract

PURPOSE:To produce a sintered ore having good quality in the high productivity by improving the air permeability without changing the density of sintering raw material between the sintering raw material dug-up with an air permeating plate and the surrounding sintering raw material. CONSTITUTION:In a sintering machine, the air permeating plate 5a which is freely ascendable/descendable to be inserted to a prescribed depth into the sintering raw material layer 2' from the upper part to the sintering raw material layer 2' on a pallet, a levelling plate 5b which arranges at the downstream side of the air permeating plate 5a and flattens the surface of the dug-up sintering raw material 2'' by inserting the air permeating plate 5a, and a cylinder device 5c for ascending/descending these air permeating plate 5a and the levelling plate 5b, are formed in the suitable sets in the width direction of the pallet between a raw material supplying part 1 and an ignition furnace 3. The air permeating plate 5a is applied with the wear resistant treatment to the upstream side part and also, is provided with an opening hole 5aa for preventing adhesion of the sintering raw material 2 to the inserting part into the sintering raw material layer 2'. By this constitution, the adhesion of the sintering raw material 2 to the surface of the air permeating plate 5a is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the air permeability of a sintering raw material layer on a pallet when a sintered ore is manufactured using a Dwightroid type sintering machine.

[0002]

2. Description of the Related Art When manufacturing a sintered ore using a Dwightroid type sintering machine, it is the most important issue to improve the air permeability of a sintering raw material layer on a pallet. That is, by improving the air permeability of the sintering raw material layer on the pallet, the firing rate and the cooling rate after completion of the firing are improved, and the productivity and the reduction powdering property are improved.

Therefore, in order to improve the air permeability of the sintering raw material layer on the pallet, an ITV monitor is installed in the mine discharge section to photograph the red heat state of the pallet width direction cross section of the sintered cake, and based on the photographed result. The insertion depth of the ventilation rod inserted from the vertical direction of the sintering raw material layer on the pallet can be adjusted (JP-A-4-1-1).
Japanese Patent Laid-Open No. 4-198428), and a method of adjusting the insertion length and the insertion depth of a ventilation rod inserted from the horizontal direction and the vertical direction of a sintering raw material layer on a pallet have been proposed.

[0004]

However, in the method of inserting the ventilation rod from the vertical direction of the sintering raw material layer on the pallet, the sintering raw material dug up by the ventilation rod and the surrounding sintering raw material have uneven ignitability. Occurs, and there is a problem that the usefulness of using a ventilation rod cannot be fully exhibited. In addition, the ventilation rod is worn out due to friction with the sintering raw material layer, and the ventilation rod must be replaced frequently, resulting in poor productivity.

It is an object of the present invention to provide an air permeability control device in a sintering machine which can improve the air permeability of a sintering raw material layer on a pallet while solving the above-mentioned problems caused by the use of a ventilation rod.

[0006]

In order to achieve the above-mentioned object, the air permeability control device in the sintering machine of the present invention is arranged in an appropriate number in the width direction of the pallet between the raw material supply section and the ignition furnace. A ventilation plate that can be raised and lowered to be inserted into the sintering raw material layer on the pallet from above to a predetermined depth in the sintering raw material layer, and a firing plate that is arranged downstream of this ventilation plate and excavated by inserting the ventilation plate. A leveling plate that makes the surface of the binding material smooth,
The ventilation plate and leveling plate lifting mechanism are provided, and the upstream side of the ventilation plate is subjected to wear resistance treatment, and an opening for preventing the sintering raw material from adhering is provided in the insertion portion into the sintering raw material layer. It has a different structure.

In the present invention, hardfacing or ceramics or a wear resistant metal coating or the like is adopted as the wear resistant treatment applied to the upstream side portion of the ventilation plate.

[0008]

In the air permeability control device of the sintering machine of the present invention,
A ventilation plate inserted into the sintering raw material layer on the pallet from above to a predetermined depth in the sintering raw material layer by an elevating mechanism forcibly creates a groove in the sintering raw material layer to promote ventilation of the sintering raw material layer. To do. At this time, since the opening for preventing the sintering raw material from adhering is provided in the insertion part of the ventilation plate into the sintering raw material layer, the adhesion of the sintering raw material to the ventilation plate is suppressed, and the inside of the sintering raw material layer is suppressed. The smoothness of the surface of the groove provided is not impaired. Then, the sintering raw material dug up by the ventilation plate itself has its surface smoothed by a leveling plate arranged downstream of the ventilation plate. Since the upstream side portion of the ventilation plate is subjected to abrasion resistance treatment, the abrasion of the ventilation plate is suppressed to the minimum.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air permeability control device for a sintering machine of the present invention will be described below based on one embodiment shown in FIG. FIG. 1 is a side view showing a schematic configuration of an air permeability control device in a sintering machine of the present invention.

In FIG. 1, reference numeral 1 denotes a raw material supply unit, which is installed at a surge hopper 1a for storing the sintering raw material 2 and a discharge port of the surge hopper 1a, and rolls out a predetermined amount of the sintering raw material 2 when necessary. It is composed of a feeder 1b and a deflector chute 1c for guiding the sintering raw material 2 cut out from the roll feeder 1b to be loaded on a pallet and uniformly arranging the upper surface thereof.

Reference numeral 3 denotes an ignition furnace which is arranged on the downstream side of the raw material supply section 1 so as to face the surface of the sintering raw material 2 loaded on the pallet. The ignition furnace 3 ignites the surface side. The sintering raw material 2 sucks air from the front surface side to the back surface side through the wind box 4 arranged below the pallet during transportation, and the coke mixed in the sintering raw material 2 is sequentially burned. While becoming a sinter.

The numeral 5 is installed between the above-mentioned raw material supply section 1 and the ignition furnace 3, and forcibly forms the groove 2a in the sintering raw material layer 2'on the pallet to ventilate the sintering raw material layer 2 '. It is an air permeability control device of the present invention which promotes. This air permeability control device 5
Is a ventilation plate 5a having, for example, five pallets arranged in the width direction of the pallet and provided with, for example, a square opening 5aa at the insertion portion into the sintering raw material layer 2 ', and these ventilation plates 5a are the sintering raw material layer 2'
For example, five leveling plates 5b installed downstream of the ventilation plate 5a in order to smooth the surface of the sintering raw material 2 ″ dug up by being inserted thereinto, and ventilation of each of these five The plate 5a and the leveling plate 5b are integrally moved up and down, for example, an elevating mechanism such as a cylinder device 5c.

Then, the ventilation plate 5a is subjected to abrasion resistance treatment such as hardfacing on the upstream side portion (hatched portion in FIG. 1) of the insertion portion so as to be worn by friction with the sintering raw material 2. I try to suppress it as much as possible. Further, in this embodiment, since the ventilation plate 5a and the leveling plate 5b are integrally attached to the cylinder device 5c, vertical installation position adjusting mechanisms [installation position adjusting holes 5ab and 5ba in this embodiment] are provided. It is provided so that the relative height position of the ventilation plate 5a and the leveling plate 5b can be adjusted.

One side of the Dwightroid sintering machine is 30 m
m vent holes with a width of 50 mm and a thickness of 5 mm opened with 700 mm intervals (variable spacing) in the insertion part (variable number) [hardened meat on the upstream side of the insertion part Is applied to the pallet width direction at equal intervals, and the air permeability control device of the present invention in which a leveling plate is provided downstream of these ventilation plates is applied. Ventilation plate from one side to 100mm, 150mm, 175
mm, 150 mm, 100 mm Insertion depth into the sintered raw material layer to produce a sintered ore, production rate, rotational strength (TI), reduced pulverization index (RDI), return ore, raw material layer thickness ,
Table 1 below shows average values of electric power consumption and coke consumption.

Table 1 shows the number of ventilation rods having a diameter of 6 to 8 mm (wires coated with a ceramic sleeve).
Insert the book at the same place as the bottom edge of the ventilation plate and insert a depth of 100
The results of the case where a sintered ore is manufactured by inserting at 0 mm are also shown as a conventional example.

[0016]

[Table 1]

As is clear from Table 1, when the device of the present invention is applied, compared with the case where the conventional device is applied,
Since the breathability is improved, the raw material layer thickness can be increased,
It was found that the quality, especially the reduced pulverization property, was improved, and the productivity was improved, and thereby the energy cost could be reduced.

In this embodiment, the same number of leveling plates as the number of ventilation plates are provided, but it is also possible to use one leveling plate to smooth all the sintering raw materials dug up in all the ventilation plates. Good. Further, although the ventilation plate and the leveling plate are moved up and down by one cylinder device in this embodiment, they may be moved up and down by separate cylinder devices. In this case, the installation position adjusting mechanism as in the present embodiment is not necessary, and the relative height position may be adjusted by the cylinder device. Further, the lifting mechanism is not limited to the cylinder device, but may be a known mechanism such as one using a rack and a pinion.

[0019]

As described above, the air permeability control device in the sintering machine of the present invention is inserted into the sintering raw material layer on the pallet from above to a predetermined depth in the sintering raw material layer by the elevating mechanism. The ventilation plate, whose upstream side is subjected to abrasion resistance, forcibly creates a groove in the sintering raw material layer to promote ventilation of the sintering raw material layer. Since the opening for preventing the sintering raw material from adhering to the inside of the layer is provided, the adhesion of the sintering raw material to the surface of the ventilation plate is suppressed and the surface of the groove provided inside the sintering raw material layer is smoothed. Will not hurt. Then, since the sintering raw material dug up by the ventilation plate itself has its surface smoothed by the leveling plate arranged downstream of the ventilation plate, the sintering raw material density between the vicinity of the ventilation plate and the vicinity of the ventilation plate is changed. Can improve breathability without
High quality sinter can be produced with high productivity.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of an air permeability control device in a sintering machine of the present invention.

[Explanation of symbols]

 1 Raw Material Supply Part 2 Sintering Raw Material 2'Sintering Raw Material Layer 3 Ignition Furnace 5 Air Permeability Control Device 5a Vent Plate 5aa Opening 5b Leveling Plate 5c Cylinder Device

Claims (1)

[Claims] 1. An appropriate number of pallets are disposed in the width direction of the pallet between the raw material supply part and the ignition furnace, and the sinter raw material layer on the pallet is moved up and down so as to be inserted at a predetermined depth in the sinter raw material layer. A free ventilation plate, a leveling plate disposed downstream of the ventilation plate and smoothing the surface of the sintering raw material dug up by inserting the ventilation plate, and a lifting mechanism for the ventilation plate and the leveling plate, and An air permeability control device in a sintering machine, characterized in that an upstream side portion of the ventilation plate is subjected to abrasion resistance treatment, and an opening for preventing the sintering raw material from adhering is provided in an insertion portion into the sintering raw material layer. .