JPH0655096A - Method for sizing powder coke for sintering and device therefor - Google Patents

Abstract

PURPOSE:To provide the method and device for sizing powder coke for sintering which can decrease the intrusion rate of fine grain coke into the final powder coke for sintering by preventing overcrushing. CONSTITUTION:The raw material coke carried into a preliminary sieve 4 is coarsely classified by this sieve as a fore stage of a coke classifying machine 1, such as vertical type cylindrical vibration sieve or Morgensen sizer, and the coarsely classified extremely coarse grain coke is charged together with the coarse grain coke classified by the coke classifying machine 1 directly to a crushing machine 8 and is crushed and sized by this machine in the stage for crushing and sizing the coke as fuel for sintering. The classification efficiency of the classifying machine is improved and the overcrushing is prevented by executing the coarse classification.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder coke sizing method and apparatus for crushing and sizing powder coke when the powder coke is used as a sintering fuel in a sintering machine.

[0002]

2. Description of the Related Art Recently, energy saving has been promoted as much as possible in the sintering operation, but the particle size of the coke powder has a great influence on this purpose. That is, in the case of fine particles, the dispersibility is high, but the amount of heat as one particle in the case of burning is low, thermal shortage occurs, and the original particle air permeability decreases. Also,
If there are many coarse particles, when they are loaded on a sinter machine pallet, they will segregate to the lower layer and cause seizure on the grate surface, resulting in quality and operating disturbance. Therefore, the optimum coke grain size has been demanded.

By the way, the grain size of the coke as a raw material varies greatly depending on the history of its occurrence. In other words, under the sieve during feeding the blast furnace, under the blast furnace during use, fine coke powder generated from the vicinity of the fire tower of the coke plant, and further, the coke charged into the blast furnace is relatively fine while balancing with the coke. There are various cases such as when coke is used for sintering,
The particle size or water content differs greatly.

Among the various coke sizes,
It was said that the powder coke for sintering had an optimal particle size of 1 to 3 mm. This is because fine coke with a size of 1 mm or less causes a decrease in air permeability and a decrease in the amount of heat during combustion, resulting in a decrease in productivity and quality.
Coarse-grained coke with a size of mm or more segregates to the lower layer during charging and seizes on the pallet-grate surface, causing operational disturbances and productivity,
This is due to deterioration in quality.

Therefore, conventionally, in order to stabilize the particle size of such a coke powder for sintering and reduce the sintering energy while maintaining the quality, in addition to various sieving methods and devices, it is crushed for sizing. A granulator and the like have been proposed. As a conventional example thereof, there is a "flue device" described in JP-A-62-114689 and a "sintering raw material charging device" described in JP-A-60-155894.

[0006]

As described above, in order to increase the productivity and improve the quality of the sintering operation, the final powder coke introduced into the sintering machine is increased in the coarse particles. It is to reduce the number of fine grains without doing so. However, in the above-described conventional powder coke sieving apparatus for sintering, it is very difficult to adjust the particle size of the powder coke having poor classification.

That is, when the particle size of the raw coke is, for example, 10 mm or more is about 20%, and 5 to 10 mm is about 15.
%, 3 to 5 mm is about 15%, 1 to 3 mm is about 25%, 1
If less than 25 mm is about 25%, it is classified by a conventional classifier, and if 5 mm or more is taken out and crushed by a crusher for sizing, the coke particle size after sizing is 3% for 5 mm or more. ~ 5mm is 12%, 1-3mm is 33%, 1m
The result is that m or less is 52%, and 1 mm or less of fine particles is significantly increased. This is because, when classifying with a classifier, coarse particles of 5 mm or more contain a considerable amount of coke, and even if there is no need for crushing, they are further crushed and finely pulverized. It means that.

In view of the above-mentioned conventional problems, the method and apparatus for sintering coke powder for sintering according to the present invention crush the coarse coke by a crusher before sizing, but prevent over-crushing to make the final powder for sintering. The object of the present invention is to provide a sintering powder coke sizing method and apparatus capable of reducing the fine coke mixing ratio of coke.

[0009]

In order to solve the above problems, a method for sizing coke powder for sintering according to the present invention is a vertical cylindrical vibrating screen or a mogen sensor in the step of crushing and sizing coke as a fuel for sintering. As a pre-process of a coke classifier such as Iser, the raw coke carried in by a preliminary sieve is roughly classified, and this coarsely classified extra coarse grain coke is directly fed to a crusher together with the coarse coke classified by the coke classifier. It is characterized by crushing and sizing.

Further, the powdery coke sizing apparatus for sintering of the present invention, in the step of crushing and sizing the coke as a fuel for sintering, as a pre-step of a coke classifying machine such as a vertical cylindrical vibrating screen or a morgen sensorizer, Slit type preliminary sieve, striker provided to disperse and feed the raw material coke carried on this preliminary sieve, and the angle for freely feeding the coke thrown by this striker onto the preliminary sieve It is provided with a shooter, and is configured such that the extremely coarse coke classified by the preliminary sieve and the coarse coke classified by the coke classifier are directly put into a crusher for crushing and sizing.

[0011]

According to the present invention, the raw coke is coarsely classified by the preliminary sieving by the above-mentioned method and apparatus, and the ultra-coarse grain coke is directly fed to the crusher without being fed to the classifier. By introducing the coke into the sintering machine, the classification efficiency by the classifier can be improved, and the improvement of the classification efficiency can reduce the mixing rate of fine coke in the final sintering machine.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the powder coke sizing method and apparatus for sintering of the present invention will be described in detail below with reference to the drawings. Figure 1
Shows the processing flow of the coke for sintering, and FIG. 2 shows the structure of the preliminary sieve part.

In the figure, 1 is a vertical rotary classifier of coke, which has classifiers 1a, 1b, 1c, and raw coke stored in a coke driving hopper 2 is passed through a belt conveyor 3. Is put in. The portion charged into the vertical rotary classifier 1 from the belt conveyor 3 is equipped with a preliminary sieve 4, and the raw coke is coarsely classified by the preliminary sieve 4, and the coke excluding the extra-coarse-grain coke is the first and the second. The two vertical rotary classifiers 1a and 1b are used for classification. Then, the coke having a predetermined size or less, which is classified by the vertical rotary classifiers 1a and 1b, is conveyed to the hopper 6 through the belt conveyor 5, and the rest is supplied from the belt conveyor 7 to the crusher 8 and crushed. It Also,
The extremely coarse-grained coke coarsely classified by the preliminary sieve 4 is directly carried into the crusher 8 from the belt conveyor 7 without passing through the vertical rotary classifier 1. The coke crushed by the crusher 8 is returned via the belt conveyor 9 to the third vertical rotary classifier 1c of the vertical rotary classifier 1 where it is further classified to the belt conveyor 5 and It is supplied from the belt conveyor 7 to the hopper 6 and the crusher 8.

By the above-mentioned processing, the powder coke classified by the vertical rotary classifier 1 and having a predetermined size or less is hopper 6.
It is stored in and used as powder coke for sintering machines. Here, the structure of the preliminary sieve 4 will be described with reference to FIG. The preliminary screen 4 has a slit type screen configuration, and is provided with a lateral slit rod 10 arranged in an inclined shape, and a lower screen hopper chute 11 for the vertical rotary classifier 1 is provided below the lateral slit rod 10. The belt conveyor 7 is provided next to the under-sieve hopper chute 11.
It is provided with an over-sieve chute 12 which is directly put on the top. Here, the raw material coke A carried in is the horizontal slit rod 1
The coke A ₁ having a predetermined size or less that has passed 0 falls to the under-sieve hopper chute 11, and the ultra-coarse grain coke A ₂ having a predetermined size or more drops to the over-sieve chute 12.

Above the horizontal slit rod 10, a striker 13 is provided to disperse and feed the raw material coke A carried in by the belt conveyor 3, and the coke A introduced by the striker 13 of the preliminary sieve 4. It is provided with a shooter 14 that can be inserted onto the lateral slit rod 10 and whose angle can be freely changed. The striker 13 disperses and drops the coke A that has been carried on the belt conveyor 3 and has come to the head portion. The striker 13 is configured such that its angle can be adjusted around a fulcrum 15, and the coke A is adjusted by an angle changing device 16. The angle can be fixed. The shooter 14 is for adjusting the falling angle of the coke A that hits the striker 13 and drops it on the horizontal slit rod 10 of the preliminary sieve 4, and the angle can be adjusted around the fulcrum 17. It is configured so that the angle can be fixed by the angle changing device 18.

In the preliminary sieve 4 having the above-mentioned structure, when the striker 13 is not provided and dropped freely, the coke A is discharged from the head portion of the belt conveyer 3.
A parabola will be drawn and it will be thrown in on the preliminary sieve 4 in a nearly vertical state, and since the coke A is concentrated on the central portion on the belt conveyer 3, dropping the sieve as it is will greatly affect the sieve effect. Get worse. From such a thing,
The striker 13 forcibly drops it while dispersing it laterally. Also, shooter 14
Is for dropping the coke A, which is dispersed by the striker 13 and dropped downward, onto the shooter 14 and throws it onto the horizontal slit rod 10 at a gentle drop angle.

The striker 13 and the shooter 1
No. 4 has wear countermeasures by sticking a ceramic liner. Further, the angle changing devices 16 and 18 select an appropriate angle according to the increase / decrease in the amount of coke and the classification efficiency. Of course, preliminary sieve 4
The screen angle of the horizontal slit rod 10 can also be arbitrarily changed.

Next, a concrete example will be described.
That is, the raw coke having the composition shown in Table 1 was used, the angle of the striker 13 was 48 °, the angle of the shooter 14 was 20 ° (all are horizontal standards), and the lateral slit rod 10 was used.
As a result of setting and setting the intervals as shown in FIG.
As shown in, the absolute amount of variation of coke having a grain size of 1 mm or less was reduced by about 3%, and the absolute amount of variation was increased by about 4% when the grain size was 3 mm or more (note that coarse grains having a grain size of 5 mm or more did not change at all). ). In addition, the sintering index (tentative name: production rate ×
The index obtained by dividing TI by the basic unit of coke) was improved as shown in FIG. Furthermore, the screen inclination angle of the preliminary screen 4 is 36 °.
Was the best.

[0019]

[Table 1]

[0020]

As described above, according to the powder coke sizing method and apparatus for sintering of the present invention, the coarse coke is crushed by the crushing machine when sizing the coke, but the final calcination is performed by preventing excessive crushing. It is possible to reduce the mixing ratio of fine-grained coke in the binding coke, thus improving the productivity and reducing the amount of coke used without lowering the quality, and the coking powder for sintering can be reduced. It is possible to provide a graining method and apparatus, and it is a very effective invention.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a coke processing flow showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of the preliminary sieve.

FIG. 3 is a specific example of a dimensional relationship of a horizontal slit rod of the preliminary sieve.

FIG. 4 is a comparison diagram of a variation state of the coke grain size.

FIG. 5 is a relationship characteristic diagram between coke having the same grain size of 3 mm or more and a sintering index.

[Explanation of symbols]

 1 Rigid rotary classifier 4 Preliminary sieve 5 Belt conveyor 6 Hopper 7 Belt conveyor 8 Crusher 10 Horizontal slit rod 13 Striker 14 Shooter

Claims (2)

[Claims] 1. In a step of crushing and sizing coke as a fuel for sintering, as a pre-step of a coke classifier such as a vertical cylindrical vibrating screen or a Mogen sensorizer, raw coke carried in by a preliminary screen is roughly classified. A coke sizing method for powder sinter for sintering, characterized in that the coarsely classified coarse coke is directly charged into a crusher together with the coarse coke classified by the coke classifier for crushing and sizing. 2. In the step of crushing and sizing the coke as a fuel for sintering, as a pre-step of a coke classifier such as a vertical cylindrical vibrating screen or a morgen sensorizer, a slit type pre-screen and a pre-screen on this pre-screen are used. There was a striker provided to disperse and feed the raw material coke that was carried in, and a shooter with an angle changeable that puts the coke introduced by this striker onto the preliminary sieve, and was classified by the preliminary sieve. A coke sizing apparatus for powder sinter for sintering, characterized in that an extremely coarse coke is directly charged into a crusher together with the coarse coke classified by the coke classifier for crushing and sizing.