JPS5993792A - Adjustment of coal to be charged - Google Patents

Abstract

PURPOSE:To obtain cob coal having high strength without using an expensive binder and to improve the strength of produced coke, by crushing partially coal constituting coal to be charged, adjusting water content, pressing and molding it into cob coal, blending it with the remaining coal, so that it is adjusted. CONSTITUTION:Coal constituting coal to be charged is partially crushed into <=1.0mm., adjusted to <=5wt% watr content, pressed and molded into cob coal by smoothing rolls or corrugated rolls. The coal is then blended with the remaining coal directly, or crushed, and blended with it, to adjust coal to be charged. The remaining powder coal is preferably adjusted to <=8wt% water content. Preferably pulverized coal is blended with one or more of poor coal, non-caking coal, semi-coke, and powdered coke and made into cob coal.

Description

[Detailed description of the invention] The present invention relates to a method for preparing charging coal.

In coke production, in order to cope with the shortage of high-quality coking coal, research and development is underway to produce high-quality metallurgical coke using inferior coking coal, non-caking coal, or unused carbon materials. The two methods are to add a binder to compensate for the lack of caking, or to improve the caking by increasing the packing density when charging coal into a coke oven.

On the other hand, studies are also underway on dry charging methods to reduce the amount of heat consumed in coke production.

The present invention is a method for densely filling a coke oven with coal and for charging dry coal.

A part of the coal constituting the trenching and charging coal is pulverized to a smaller particle size than the remaining coal, with a moisture content of 5% or less, and is pressure-molded using smooth rolls or corrugated rolls to form agglomerated coal. The method is to prepare charging coal for coke production to be mixed with coal.

As a known technique, a caking agent is added to wet coal and pressure molded to produce green briquettes, and then the green briquettes are dried and mixed with the remaining wet coal or dry coal to make charging coal. It was published in No. 7305. However, this method has the following drawbacks. In other words, the drying time is long because the wet coal is dried after being made into raw briquettes, and binders (pitch A), A) C, and No. 2 tar must be used when producing raw briquettes. .

Differences in packing density occur within the briquette, which is a nearly spherical briquette with a volume of -1!, which is thought to be one of the causes of cracks during coke formation. It has the disadvantage that the particle size becomes small.

Furthermore, d: A method of pressurizing all the charged coal has also been proposed, but it has the drawback that the agglomerated coal is weak and cannot be counterfeited. +The energy cost for molding increases.

The present invention P, -1', t: +i+ Provides a new method for preparing 7-ri4Jj coal that overcomes the drawbacks of the known techniques described above. The pulverized grain size of the remaining coal is smaller than that of the remaining coal, and the water content is 5% or less. 1) A smooth roll or a corrugated roll is used to form a plate-shaped lump coal with a diameter of 4 to 15 mm, for example. Therefore, it is easy to control the moisture content of agglomerated coal, and the particle size of the coal is reduced, and since the coal is made into agglomerated coal by rolls, there is no need for expensive binders such as pitch, making it possible to form agglomerated coals with high strength. Charcoal can be made into comb. Furthermore, it has the advantage of being able to produce uniform lump coal with little difference in density within the lump coal, or because the coal particle size is small, it prevents the occurrence of distortion from high density lump coal during the carbonization process, This is achieved by increasing the strength of the coke produced.

Next, the constitution of the present invention will be explained.

It is in accordance with 2-'- of the present invention that a part of the coal constituting the charged coal is pulverized to a size of 1.0 mm or less and the moisture content is reduced to 5% or less, and then pressure-formed with smooth rolls or corrugated rolls. The agglomeration of coal is mainly done without using the usual caking agent, so in order to improve the moldability of coal, it is possible to reduce the coal particle size. This is because if the amount is too large, the strength of the lump coal will decrease. The pulverized particle size of the normal charged coal is 13 mm and 80 to 85%. In contrast, unexploded IJ
In J, the particle size of the coal in the part that is to be made into agglomerated coal is the roll size at the time of agglomeration (・", roll)? It is also related to d speed, but -1
, Oran.

], (1 (1% good -4, very -0.5mm, ]
, O0% is good.

d) The water content is preferably 2φ or less. In this case, the water content rjll and qf may be determined either before or after the coal is pulverized.

Powdered coal Jj17. Using a flat +7i roll case or a corrugated roll for prestige, 1. The compression pressure is evenly applied to the powdered coal, and 1. Changes in apparent density are small even inside the coal. The lump coal produced in this way is strong H)! It has a strong L and is less likely to be damaged during transportation, and is made of coke: +1 good buy, Tj 5 go.

After crushing the lump coal, mix it with the remaining coal using the lump coal paste, 11 degrees, and 1 ton. However, the grain size of agglomerated coal is small and strong J)
In the case of 11:, , I, there is no need to crush the material because it will easily break during the transportation process. Lump coal - High-grade coke can also be produced from charged coal made by mixing ti11+'N crushed agglomerate coal with the remaining coal.

In the embodiments of the present invention, the reason why the remaining moisture content is set to 8 times t% or less is that the lower the moisture content of the charged coal, the higher the charging density, which results in better coke quality, and improves coke quality. Heat consumption - fan can be reduced. However, if the water content is less than 5%, dust will be generated, which is not preferable. Therefore, the moisture content of the remaining coal is preferably in the range of 5% to 8%.

In another embodiment, the agglomerated coal portion contains one of the carbon materials consisting of low-density coal, non-caking coal, semi-coke, and fine coke.
The reason why one or two or more coals are added is to make high-density lump coal by pressure molding, so the lump coal has sufficient caking properties, so it is possible to create a lump with low caking property or no caking at all. This is because even if kJX of carbonaceous substances are added, the produced coke has a high coke composition, and non-caking coal etc. can be firmly fixed in the coke structure, making it possible to use carbonaceous substances Tt for unused carbon. be.

Hereinafter, the present invention will be explained based on examples. In the following examples, coal having the properties shown in Table 1 was used as charging coal.

Table 1 Example: After drying unpulverized coal having a ladle shape shown in Table 1 to a moisture content of 2.5 parts::, Z, a master having a grain size of 1.0 grains and a grain of 1.0 grains. Using squid crusher, classify and crush the whole surface 1.
Grind to C1n+m Li-1, and reduce the remaining 60 yen to 13
I lost my throat in 4 minutes to 85 cm/Tomi.

, 1. (1) The pulverized coal in the lock was turned into agglomerated coal using a smooth roll, and mixed with the remaining pulverized coal of -3 mm 85 to prepare charged coal.

, Tsu 1 power ILI Example 2 Ji;
Moisture content of 5 cm of powdered coal
Charcoal was prepared using the same method.

Practical Example 1 List 11 ・1.11 and I, ・Sushi Iil+
After adding and mixing 10 degrees of non-caking coal shown in Table 2 to the pulverized coal produced in J', lump coal was produced using a smooth roll. This agglomerated coal was mixed with 13mm 85φ dried powdered coal prepared in the same manner as in Example 2, with the addition of 40M iron to prepare charging coal.

Table 2 Comparison Reli 1 The total amount of coal shown in Table 1 was crushed into 13-85 pieces and used as charging coal.

Next, the charged coal prepared in the above Examples and Comparative Examples was placed in a tin can with a height of 450 mm, a length of 600 mm, and a width of 400 mm, and charged into an electric furnace, and the coal column temperature was raised to 1050°C. It was kept for 3 hours and carbonized. The quality of coke produced by carbonization is indicated by drum strength D11≧0, and Table 3
It was shown to.

Table 3 The present invention is superior to coke products as shown in Table 3.

Claims (1)

[Claims] 1. A part of the coal constituting the charged coal is pulverized to a size of 1.0 or less, the water content is reduced to 5φ or less, and then pressurized with smooth rolls or corrugated rolls to form agglomerated coal. A method for preparing charged coal, which is characterized in that it is crushed or crushed and then mixed with the remaining coal. 2. The method for preparing charged coal according to claim 1, characterized in that the moisture content of the remaining powdered coal is reduced to 8x, W-S or less. 3. Claim 1, characterized in that pulverized coal is mixed with one or more of carbon materials consisting of inferior quality coal, non-caking coal, semi-coke, and fine coke to form lump coal. Item 1
・The method for preparing charging coal described in Section 2.