WO2006038356A1

WO2006038356A1 - Process for production of cokes and productive facilities therefor

Info

Publication number: WO2006038356A1
Application number: PCT/JP2005/012290
Authority: WO
Inventors: Kenshi Noda; Takuro Iwama; Yasuo Nagashima; Kiyoshi Fukada
Original assignee: Jfe Steel Corporation
Priority date: 2004-09-30
Filing date: 2005-06-28
Publication date: 2006-04-13
Also published as: CN1965058B; CN1965058A; KR100865223B1; TW200610813A; KR20070034486A; TWI285218B

Abstract

A process for the production of cokes and productive facilities therefor, which enable the production of cokes having improved strength through the adjustment of particle size distribution of coal used as the raw material, while inhibiting lowering in the productivity and increase in the cost. Specifically, a process for the production of cokes, characterized by comprising the classification step of classifying at least a part of the coal used as the raw material of cokes into coal of larger particle size and coal of smaller particle size, the first pulverization step of pulverizing the coal of larger particle size, the first blending step of blending the pulverized coal obtained in the first pulverization step with the coal of smaller particle size, the second pulverization step of pulverizing the resulting blend, and then the charging step of charging the pulverized coal obtained in the second pulverization step together with the rest of the coal used as the raw material into a coke oven. It is preferable that coal (X) of higher hardness and coal (Y) of lower hardness be used and at least a part of the coal (X) be classified into coal of larger particle size and coal of smaller particle size.

Description

Specification

Coke production method and equipment Technical field

The present invention relates to a manufacturing method for opus used as an iron-making raw material and an opi manufacturing facility. Background art

It is desirable that the coatus used as a raw material for iron making has a high strength because it deteriorates the air permeability of the blast furnace when it is pulverized when charged into the blast furnace. In order to produce high-strength coke, the smaller the particle size of the coal, the raw material, is preferable. On the other hand, the smaller particle size of the coal is difficult to handle when charging in the coke oven. Therefore, it is preferable to use coal with a particle size in the range of about 0.5 mm to 6 mm, for example, because productivity does not improve. In order to achieve such a particle size range, the pulverized coal is changed to a coal having a particle size of only 0.5 mm to 6 mm except for those less than 0.5 mm and exceeding 6 mm by sieving. -Although it is possible to pulverize over 6 mm again and use it as the raw material for coatus, the one below 0.5 mm will be disposed of without any preferred use, resulting in processing costs. However, it is not preferable in terms of yield improvement, and the filling rate of coal in the coke oven is also lowered, which is not a realistic method.

As a method of adjusting the particle size by specifying only the upper limit of the particle size of coal for charging coke ovens, the coal is classified with a sieve having a sieve with a predetermined particle size, and the portion under the sieve is mixed as it is for cotas. A method is known in which the coarse particles on the sieve are used as a raw material, and the pulverization and classification are repeated until the coarse particles pass through the sieve (see, for example, Japanese Patent Laid-Open No. Sho 5 6-3 2 587). In the method described in Japanese Patent Laid-Open No. Sho 5 6-3 2 5 8 7, the sieve mesh is changed between coal rich in active components (soft coal) and coal rich in active components (hard coal). Therefore, the particle size of coal that is not rich in active ingredients is made smaller to make a blended raw material. Coal whose particle size is adjusted to each is mixed as appropriate and charged into a coke oven to produce a high strength cortas.

In addition, by increasing the packing density of coal in the coke oven, it is possible to improve productivity and produce high-strength cortas. After classifying, the coal with a large particle size and small particle size is broken with a breaker, and the crushed coal is charged into the coke oven together with the medium-sized coal previously classified. A method for adjusting the particle size is also known (see, for example, Japanese Patent Application Laid-Open No. 11-300 26 2).

However, in the method described in Japanese Patent Laid-Open No. Sho 5 6-3 2 587, it is necessary to repeatedly crush coal having a predetermined particle size or more until the particle size becomes smaller than the predetermined particle size. The product is also screened and pulverized, reducing productivity.

In addition, the method described in Japanese Patent Application Laid-Open No. 1 1 1 3 0 2 6 6 2 has a maximum number of crushing times of 2 for the same coal. Since it is crushed again by the crusher, even if a distribution close to the ideal coal particle size distribution state is obtained, where the fine particles increase and the filling state in the coatus furnace is the closest packing, it is not desirable in actual operation . In addition, since the crushed coal is classified into three stages of large particle size, medium particle size, and small particle size, the equipment cost for sieving increases.

In addition, the method described in Japanese Patent Laid-Open No. 2 0 0 5-1 5 4 7 3 7 was developed by the inventor of the present application, and has a brand of charcoal whose hardness is higher than a predetermined standard, and the predetermined Classify the coal with a hardness lower than that of the standard, crush some of the harder brand coal, then blend with the remaining non-pulverized coal, and crush these blended coals again. This technology is disclosed. However, even with this technology, it was still insufficient to bring the coal particle size distribution to the proper range of 0.5 mm to 6 mm. Therefore, the object of the present invention is to solve the problems of the prior art, and to improve the coatus strength by reducing the productivity and suppressing the cost increase while keeping the particle size distribution of the coke raw material coal within an appropriate range. It is to provide a method and equipment for producing coke that can be used. Disclosure of the invention

The features of the present invention for solving such problems are as follows.

(1) A classification step of classifying at least a part of the coal used as the raw material for Coats into a coal having a large particle size and a coal having a smaller particle size than the coal, and a first pulverizing the coal having a large particle size. The first pulverization step, the first pulverization step of mixing the coal pulverized in the first pulverization step and the coal having a small particle diameter, and the second pulverization step of pulverizing the mixed coal And then charging the coke oven together with the remainder of the coal used as the raw material for the coatus.

(2) a classifying step of classifying a part of coal as a raw material for coatas into a coal having a large particle size and a coal having a small particle size, a first pulverizing step for pulverizing the coal having a large particle size, After blending the coal treated in the first pulverization step, the coal having a small particle size, and the remainder of the coal as the coatus raw material, and after the second pulverization step of pulverizing the blended coal A method for producing a coatus, characterized by being charged into a coke oven.

(3) a classifying step of classifying a part of coal as a raw material for coatas into a coal having a large particle size and a coal having a small particle size, a first powdering step for pulverizing the coal having a large particle size, It is processed by the 1st compounding process which mixes the coal processed by the 1st powdering process, and the coal with the above-mentioned small particle size, and the 2nd powdering process which powders this compounded coal, and becomes the above-mentioned Kotas raw material After being treated by the second blending step for blending the remainder of the coal and the third powdered step for crushing the blended coal, the coal treated with the second powdered step is charged into the coke oven. A method for producing a coatus, comprising: (4) A method for producing coatas using coal (X) having a high hardness and coal (Y) having a hardness lower than that of the coal (X), wherein at least a part of the coal (X) is granulated. A classification process for classifying the coal with a large diameter and a coal with a particle diameter smaller than that of the coal; a first pulverizing process for pulverizing the coal with a large particle diameter; and the coal treated in the first pulverization process And the coal having a small particle diameter and Z or the remainder of the coal (X), and the second coal mashing process for pulverizing the blended coal. A method for producing a coatus, comprising charging (X) and the coal (Y) into a coke oven.

(5) A method for producing coatas using coal (X) having a high hardness and coal (Y) having a hardness lower than that of the coal (X),

A classification step of classifying at least a part of the coal (X) into a coal having a large particle size and a coal having a small particle size, a first pulverizing step of pulverizing the coal having a large particle size, and the first pulverization It was processed by a blending step of blending the coal treated in the process, the small particle size coal, the remainder of the coal (X) and the coal (Y), and a second grinding step of grinding the blended coal A method for producing a coatus, which is subsequently charged into a coke oven.

(6) A method for producing coatas using coal (X) having a high hardness and coal (Y) having a hardness lower than that of the coal (X), wherein at least a part of the coal (X) is granulated. A classification step of classifying the coal with a large diameter and a coal with a small particle size, a first pulverization step for pulverizing the coal with a large particle size, the coal treated in the first pulverization step, and the particle size The first coal blending step is performed by a first blending step of blending the small coal and the remainder of the coal (X), and a second powdering step of pulverizing the blended coal, and blending the coal (Y) The coal (X) and the coal (Y) are charged into a coke oven after being treated by the second blending step and the third grinding step of grinding the blended coal. Coke production method.

(7) Coal (X) with high hardness and coal with lower hardness than the coal (X) (Y) and a classification process for classifying at least a part of the coal (X) into coal having a large particle size and coal having a small particle size, A first crushing step of crushing large coal, a first blending step of blending the coal treated in the first crushing step with the coal having a small particle size, and a second crushing of the blended coal A second blending step in which the remainder of the coal (X) and the coal (石炭) are blended separately, and the blended coal is ground in a separate manner. And then charging the coal (X) and the coal (soot) into a coke oven.

(8) Using coal (X ') with a large amount of inert and coal (Υ') with a smaller amount of inert than the coal (X '):? A method for producing one tas, wherein a classification step of classifying at least a part of the coal (X ′) into a coal having a larger particle diameter and a coal having a smaller particle diameter than the coal; A first pulverizing step of pulverizing coal, and a first compounding step of combining the coal treated in the first pulverizing step with the coal having a small particle diameter and / or the remainder of the coal (X ′). And a second crushing step of crushing the blended coal, and thereafter charging the coal (X ′), the coal (Υ ′), and a coke oven.

(9) A method for producing coal using a coal (Χ,) having a large amount of inert and coal (Υ,) having a smaller amount of inert than the coal (X ′), wherein the coal ( A classifying step of classifying at least a part of X ′) into a coal with a large particle size and a coal with a small particle size, a first powdering step for pulverizing the coal with a large particle size, and the first pulverization It is processed by a blending step of blending the coal treated in the process, the coal having a small particle size, the remainder of the coal (X ′) and the coal (Υ ′), and a second powder milling process for pulverizing the blended coal And then charging the coke oven.

(1 0) A method for producing coke using coal (Χ,) with a large amount of inert and coal (Υ ') with a smaller amount of inert than the coal (X'). Therefore, a classification step of classifying at least a part of the coal (Χ ′) into a coal having a larger particle size and a coal having a smaller particle size than the coal, and a first step of pulverizing the coal having a larger particle size. A first blending step of blending the coal treated in the first pulverization step with the coal having a small particle diameter and the remainder of the soot or the coal (X ′), and the blended coal It is processed by a second pulverizing step of pulverizing, and is processed by a second pulverizing step of mixing the coal (Υ ′), and a third pulverizing step of pulverizing the mixed coal, and the coal (X A manufacturing method of cortas characterized by charging ') and the coal (Υ) into a coke oven.

(1 1) A method for producing coal using coal (X ′) having a large amount of inert and coal (石炭 ′) having a smaller amount of inert than the coal (X ′). A classification step of classifying at least a part of (X ′) into a coal with a large particle size and a coal with a small particle size, a first pulverization step for pulverizing the coal with a large particle size, and the first pulverization A first blending step of blending the coal treated in the step with the coal having a small particle size, and a second grinding step of grinding the blended coal, and the remainder of the coal (X ′) And the second coal blending step in which the coal (Υ ′) is blended separately, and a third powder milling step in which the blended coal is separately ground,

A method for producing a coat, characterized by charging (Χ,) and the coal (Υ,) into a coke oven.

(1 2) Characterized by classifying coal with a particle size set within a range of 1 to 20 mm and coal with a large particle size and coal with a small particle size (1) to (1

1) The production method of coatus according to any one of 1).

(1 3) A classifier that classifies a part of coal as a raw material for coatas into a coal with a large particle size and a coal with a small particle size, a first pulverizer that pulverizes the coal with a large particle size, A blending tank for blending the coal treated with the first powder mill, the coal having a small particle size, and the remainder of the coal as the coke raw material, and a grinder for grinding the coal blended in the blending tank; Processed by the crusher Cotas production facility comprising a transporter for transporting coal to a coke oven.

(14) A classifier that classifies a part of coal that is a raw material for the coatus into a coal with a large particle size and a coal with a small particle size, a first powder mill that crushes the coal with a large particle size, A first compounding tank for compounding the coal treated with the first powder mill and the coal having a small particle diameter; and a second pulverizer for pulverizing the coal compounded in the first compounding tank And a second blending tank for blending the remainder of the coal as the coke raw material, a third mill for grinding the coal blended in the second blending tank, and the second mill A coatus production facility comprising a transporter for transporting coal and the coal treated by the third grinder to a coatus furnace.

(15) The Cortas manufacturing facility according to (13) or (14), wherein the pulverization capacity of the first pulverizer is greater than that of the second pulverizer. Brief Description of Drawings

FIG. 1 is a schematic diagram of an embodiment of the coatus production facility of the present invention.

Figure 2: Graph showing the particle size distribution of blended coal.

Fig. 3: Graph showing the relationship between the classified particle size and the coatus production cost in the classification process.

(Explanation of symbols)

1: coal yard, 2: coal yard, 3: sieve, 4: first crusher, 5: first compounding tank, 6: second compounding tank, 7: second compounding tank,

8: second powder crusher, 9: third crusher, 10: third powder grinder, a: above sieve, b: below sieve Best mode for carrying out the invention

In the present invention, at least a part of the coal used as the raw material for coatus is It is divided into coal with a large particle size and coal with a small particle size, and after pulverizing the coal with a large particle size, the coal with the small particle size is mixed and re-pulverized and charged into a coke oven. To produce Koitas. That is, a classification step of classifying at least a part of coal as a raw material for raw materials into a coal having a large particle size and a coal having a smaller particle size than the coal, and a step of pulverizing the coal having a large particle size. The first pulverization step, the first pulverization step of mixing the coal pulverized in the first pulverization step and the coal having a small particle diameter, and the second pulverization step of pulverizing the mixed coal. After that, it is charged into a coke oven together with the remainder of the coal used as the raw material for the coatus. It is sufficient to classify coal with a large particle size and coal with a small particle size by sieving using a sieve. Therefore, as the classification process, for example, using a sieve, the top and bottom sieves are used. Classify coal into In the first pulverization process, powder is reduced on the sieve having a particle size larger than the sieve mesh to reduce the particle size. For sieving with a particle size smaller than the mesh size, the first pulverization step is not performed, and the first pulverization step is combined with the first pulverization step (the first mixing step), followed by the second pulverization step. Crushing process. In the first blending step, it is sufficient to put coal with a large particle size and coal with a small particle size into a blending tank or the like to make a mixed state. Special mixing means are also used in the following blending steps. There is no need to provide it. By crushing only the coal with a large particle size in advance (first crushing process), the proportion of coal with a large particle size decreases. As a result, the ratio of coarse particles is reduced, so that the pulverization ability in the second pulverization step can be reduced and pulverization can be performed. As a result, the coal particle size distribution is improved. After pulverizing coal on a sieve with a large particle size in the first pulverization process, the same coal is repeatedly pulverized by pulverizing in the second pulverization process together with sieving without repeating classification by sieving again. This is advantageous in terms of productivity. In addition, there is no coal with a large particle size after the first grinding process. Although it is present, it is finely pulverized in the second pulverization step. Therefore, even after the pulverization process in the first pulverization process and the second pulverization process, there is a certain proportion of coal with a large particle size that is classified on the sieve in the classification process. Compared to the case where no treatment is performed, the ratio is sufficiently reduced.

Therefore, it is desirable to make the grinding capacity smaller in the “second grinding process” than in the “first grinding process”. For example, the “first grinding process” and the “second grinding process” This can be dealt with by using a different crushing device, or by reducing the number of revolutions of the crushing blade of the crushing device so that the “second powdering process” has a lower powdering capacity than the “first powdering process”. When all of the coal that is the raw material for the Kotas is processed in the first pulverization step of the above classification process, the remaining coal that is the raw material for the Kotas is naturally not present. On the other hand, when only a part of the coal that is the raw material for the cotas is processed in the above classification process and the first powdering process, the remainder of the coal that is the coke raw material is the first grinding process in the classification process. The coke oven is charged together with the coal treated in step 1. That is, a classification step of classifying a part of coal as a raw material for the coatas into a coal having a large particle size and a coal having a small particle size, a first pulverizing step of pulverizing the coal having a large particle size, A coke after the coal is treated in the pulverizing step, the coal having the small particle size and the remainder of the coal as the coke raw material, and the second pulverizing step of pulverizing the blended coal. It is desirable to charge the furnace.

When only a part of the coal that is the raw material for the coatus is processed in the classification process and the first crushing process, the quality of the coal, such as the hardness and the amount of inert, varies depending on the brand, and the powder is pulverized by adjusting the powder conditions for each brand It is desirable to do. Therefore, it is preferable that a plurality of blending tanks are arranged according to coal quality or brand, and a plurality of breakers are arranged correspondingly, and it is desirable that the remaining coal be separately treated with powder. In other words, part of the coal that is the raw material for the coatus is divided into coal with a large particle size and coal with a small particle size. JP2005 / 012290

A first classifying step for blending the coal pulverized in the first dusting step and the coal having a small particle size; A second pulverizing step of pulverizing the blended coal, and the remainder of the coal as the coatus raw material is blended with the remainder of the coal as the coke raw material, and the blended coal It is desirable that the powder be pulverized in the third pulverization step and charged into the coke oven together with the coal pulverized in the second pulverization step. For the remainder of the coal as the raw material for the Kotas, which is not treated in the classification process, the third powdering process should be omitted if it is fine-grained or has a suitable particle size distribution for charging into the coke oven. Is also possible.

In addition, when only a part of the coal used as a coke raw material is processed in the first pulverization process above the classification process, it is desirable to preferentially process hard coal. That is, when producing coatas using coal (X) having a high hardness and coal (Y) having a hardness lower than that of the coal (X), at least a part of the coal (X) having a high hardness has a particle size. A classification step of classifying the coal having a larger particle size and a coal having a smaller particle size than the coal, a first pulverization step for pulverizing the coal having a larger particle size, the coal treated in the first pulverization step, and the After processing by a first blending step of blending a small particle diameter coal opino or the remainder of the coal (X) and a second grinding step of grinding the blended coal, the coal (X ) And the coal (Y) are preferably charged into a coke oven.

Furthermore, coal (Y) can also be blended in the first blending step and pulverized in the second pulverization step. That is, coal with high hardness

A method for producing coke using (X) and coal (Y) having a hardness lower than that of the coal (X), wherein at least a part of the coal (X) comprises a coal having a large particle size and a particle size. A classification process for classifying into a small coal, a first powdering process for pulverizing the coal having a large particle diameter, coal treated in the first pulverization process, coal having a small particle diameter and coal (X) The remainder of the coal (Y) It is desirable to charge the coke oven after the blending step of blending (Y) and the second powder grinding step of pulverizing the blended coal. In addition, the quality of coal, such as hardness and inert amount, varies depending on the brand, and it is desirable to adjust the grinding conditions for each brand and form a powder frame. Therefore, it is preferable that a plurality of coal tanks are arranged according to coal quality or brand, and a plurality of crushers are arranged correspondingly. Coal (X) having high hardness and the coal

A method for producing coatas using coal (x) having a hardness lower than that of (X), wherein at least a part of the coal (X) is converted into coal having a large particle size and coal having a small particle size. A classifying step for classifying, a first pulverizing step for pulverizing the coal having a large particle size, coal treated in the first powder mashing step, and coal having a small particle size or the coal (X ) And the second compounding step of compounding the coal (i), and the compounding method. After processing by a third pulverization step of pulverizing the coal,

It is desirable to charge (X) and the coal (Υ) into a coke oven. Furthermore, in the above, the remainder of coal (X) and coal (soot) can be blended using separate blending tanks and pulverized for each blending tank. That is, a method for producing coatus using coal (X) having a high hardness and coal (soot) having a hardness lower than that of the coal (X), wherein at least a part of the coal (X) has a particle size A classification process for classifying the large coal and a small particle diameter coal, a first grinding process for pulverizing the large particle coal, the coal treated in the first pulverization process and the particle diameter The first mixing step of mixing small stones ^ and the second pulverizing step of pulverizing the combined coal, and the remaining part of the coal (X) and the coal (soot) are combined separately. After the second blending step and the third grinding step of separately grinding the blended coal, the coal (X) and the coal

It is desirable to charge (ii) into a coke oven.

In addition, coal (X) with a high hardness and coal with a hardness lower than that of the coal (X) (Y) and a method for producing coke, wherein at least a part of the coal (X) is classified into coal having a large particle size and coal having a small particle size, and the particle size A first pulverizing process for pulverizing large coal, and at least a part of the coal treated in the first pulverizing process and the small-sized coal and the remainder of the coal (X). Or a first pulverizing step of blending at least a part of the coal (Υ) and a second pulverizing step of pulverizing the blended coal, and not treated by the second pulverizing step. After processing by the second blending step of blending the remaining coal and the third grinding step of pulverizing the blended coal, the coal (X) and the coal (入) are charged into a coke oven. It can also be selected as a desirable method.

Coal, which is usually a coke raw material consisting of multiple brands, is replaced with high hardness coal

In order to classify (X) and coal (X) with lower hardness than the coal (X), a predetermined standard set as appropriate is used, and coal (X) with a hardness higher than the predetermined standard is selected. It can be classified as coal (Υ), which has a lower hardness than the standard. For example, when producing Cotas using coal brands A, B, and C, classify coal brand A, which has the highest average hardness, into coal (X), which has the highest hardness, and coal brands B, C, which have low hardness. Classify as coal (Y). In addition, when using coal brands D, E, and F, which have lower hardness compared to coal brands A, B, and C, set a predetermined standard low and compare with coal brands D, E, and F. Coal brand D with high hardness can be classified as coal (X) with high hardness. Desirable standards should be set so that the cost of Kotas production and the production efficiency are optimized in consideration of the brand of raw coal used and the production capacity of Kotas. As is clear from the above example, high hardness coal (X) and low hardness coal (Y) are not limited to a single brand, but consist of multiple brands of coal. It has.

The reason why hard coal is preferentially treated in the first grinding process is This is because coal with a large particle size is mainly high-hardness coal, and productivity can be improved by preferentially increasing the number of powdered hard coal that is difficult to grind. In other words, if not all the raw coals are treated in the first pulverization process of the classification process, it is preferable to prioritize the classification and pulverization process with preference given to the high hardness coal (X). That's right. It is effective if only a part of the coal (X) is treated in the classification process and the first pulverization process. For example, the coal is classified into a coal having a large particle size and a coal having a small particle size, Even if the amount of stone that is pulverized into coal with a large particle size is about 10% of the total amount of coal, the coal (X) in the entire raw material is preferentially classified and crushed. As a result, the particle size distribution can be remarkably improved. The classification of coal (X) and other types of coal is not strict, and an average hardness is defined for each brand of coal, and if the average hardness exceeds a predetermined standard, it will be classified as coal (X). The coal (X) may partially contain coal having a hardness below a predetermined standard. The larger the proportion of coal (X) that is processed in the classification process and the first powdering process, the better the particle size distribution, but the processing cost also increases.

It is known that the hardness of coal varies depending on the production area. In the classification process · The first crushing process is performed preferentially for those with high hardness. It is desirable to use HGI as the predetermined standard when classifying coal (X), and an index indicating pulverizability. It is preferable to use coal (X) that has an HGI (hard glove index: JIS—M — 8 8 0 1) of 80 or less. As the coal having an HGI of 80 or less, it is preferable to use non-thin coal. Many non-thin coals have a high hardness of H G I 80 or less and are inexpensive. Judgment of the hardness of coal with respect to a predetermined standard can be made, for example, by measuring the average H GI for each brand of coal and comparing these average values with a predetermined standard.

In addition, only a part of the coal that is the raw material for Kotas is used in the above classification process. When processing in the first crushing process, it is desirable to treat coal with a large amount of inerting with priority. That is, a method for producing coal using coal (X,) having a large amount of inert and coal (石炭 ′) having a smaller amount of inert than the coal (X,), wherein the coal (X ′) A classifying step of classifying at least a part of the coal into a coal having a large particle size and a coal having a smaller particle size than the coal, a first pulverizing step of pulverizing the coal having a large particle size, and the first powder cake A first blending step of blending the coal treated in the process with the small-sized coal opino or the remainder of the coal (X ′), and a second powder mill for pulverizing the blended coal After processing by the coal

It is preferable to charge (X ′), the coal (Υ,) and the coke oven. On the other hand, coal with a small amount of inert (Υ ')

It can be blended with (X ') and pulverized. A method for producing coatas using coal (X ′) having a smaller amount of inert than coal (X ′), wherein at least a part of the coal (X ′) is made of a large particle size coal and a particle size A classification process for classifying into small coal, a first pulverization process for pulverizing the coal having a large particle diameter, coal treated in the first pulverization process, and a coal and coal having a small particle diameter (X ′ It is desirable to charge the coke oven after processing by the blending step of combining the remainder of) and the coal (Υ ') and the second pulverization step of pulverizing the blended coal.

Also, the quality of coal, such as hardness and inert amount, varies depending on the brand, and it is desirable to adjust the grinding conditions for each brand and pulverize it. Therefore, it is preferable to arrange multiple coal tanks according to quality or brand of coal, and to arrange multiple crushers corresponding to the coal, so that the amount of inert gas is larger than that of coal (X ') and the coal (X'). A method for producing a coal using a small amount of coal (Υ,), wherein at least a part of the coal (X ′) comprises a coal having a larger particle size and a coal having a smaller particle size than the coal. A first pulverizing step for pulverizing the coal having a large particle size, a coal treated in the first pulverizing step, and a coal opino having a small particle size. 'Is treated by a first blending step in which the remainder of the coal (Χ') is blended and a second dusting step in which the blended coal is crushed, and a second blending the coal (Υ '). It is preferable that the coal (X ′) and the coal (soot,) are charged into a coke oven by performing a blending step of the above and a third pulverization step of grinding the blended coal.

Furthermore, in the above, it is preferable to blend the remainder of coal (X ′) and coal (Υ,) using separate blending tanks and to grind each blending tank. That is, coal with a large amount of inert (X ') and the coal

A method for producing coke using coal (Υ,) having a smaller amount of inert than (Χ,), wherein at least a part of the coal (X ′) is made from a coal with a large particle size and a small particle size. A classification step of classifying into coal, a first pulverization step of pulverizing the coal having a large particle size, and a first pulverizing agent comprising the coal treated in the first pulverization step and the small particle size coal The coal is treated by a blending step and a second grinding step of grinding the blended coal,

(X ′) and the coal (X ′) after being treated by a second compounding step of separately compounding the coal (X ′) and a third powdering process of separately pulverizing the compounded coal. And the coal (Υ ') are preferably charged into a coke oven.

Further, the present invention relates to a method for producing coke using coal (X ′) having a large amount of inert and coal (Υ,) having a smaller amount of inert than the coal (X ′ :). A classifying step for classifying at least a part of the coal into a coal having a large particle size and a coal having a smaller particle size than the coal, a first powdering step for pulverizing the coal having a large particle size, The coal treated in the pulverization step is combined with at least a portion of the coal with a small particle size and / or the remainder of the coal (X ′) or at least a part of the coal (Υ ′). A first blending step, a second blending step of treating the blended coal and a second grinding step of grinding the blended coal, and blending the remaining coal that is not treated by the second grinding step; Pulverized coal The coal (X ′) and the coal treated by a third powdering process

Charging (Υ ') into the coke oven can also be selected as a desirable method.

When coal with a high amount of inert coal is used as a raw material for cracks, cracks are likely to occur during the coating process, and the strength of the manufactured coatus tends to decrease. Therefore, it is preferable to disperse as much as possible when charging into the coke oven, and for this purpose, it is desirable to pulverize into fine particles. Therefore, the strength of the coatus can be improved by giving priority to increasing the number of coal dusts with a large amount of inert. Therefore, if all the raw coals are not treated in the classification process, the first powdering process, the coal (X ') with a large amount of inerting is given priority. It is preferable to carry out the treatment. It is effective to process only a part of the coal (χ,) in the classification process and the first powdering process. For example, the coal is separated into coal having a large particle size and coal having a small particle size, Even if the amount of coal that is pulverized into large-diameter coal is about 10% of the total amount of coal, the coal (X ') of the entire raw material is preferentially classified and pulverized to give a total As a result, the particle size distribution can be remarkably improved. The classification of coal (X ') and other coals is not strict, and the average amount of each coal brand must be specified and the average value exceeds the prescribed standard. The coal (X ′) may be classified into coal (X ′), and the coal (X ′) may partially contain coal having a hardness below a predetermined standard. coal

Of the (X '), the greater the proportion of treatment in the classification process and the first grinding process, the greater the strength of the coat, but the higher the treatment cost.

Coal is known to have different amounts of inert (non-molten component) depending on the production area. Classifying the coal with a large amount of inert (i.e., 処理) when the one with a large amount of inert is preferentially processed in the classification process · 1st crushing process, the brand of the raw coal used In addition, considering the coke production facility capacity, etc., the cost of cotas production will be set as appropriate so that production efficiency is optimized. However, it is particularly preferable to use coal with an inert amount of 35% or more as a coal with a large amount of inert coal (X,). As coal having an inert amount of 35% or more, it is preferable to use non-thin coal. Many non-thin coals have a high inert amount and are inexpensive. Judgment of coal inert amount is performed, for example, by measuring the average inert amount for each brand of coal and comparing these average values with a predetermined standard (eg, inert amount of 35%). Can do.

Therefore, when only a part of the coal used as the raw material for the coating is processed in the above-mentioned classification process and the first crushing process, the coal is classified using both the standards of the hardness and the amount of the final component. It is desirable to preferentially treat hard and heavy inert materials in the classification process · first grinding process. In particular, it is desirable to preferentially treat coal having HGI of 80 or less and an inert amount of 35% or more in the classification step / first grinding step. Non-carburized coal is very suitable because it has many varieties with an HGI of 80 or less and an inert amount of 35% or more and is inexpensive.

In the classification process, when classifying coal into coal with a large particle size and coal with a small particle size, a coal with a particle size set within a range of 1 to 20 mm and a particle size with a large particle size. It is preferable to classify with small coal. If the classification particle size (the particle size at the time of classification, for example, equivalent to the mesh size when classification using a sieve) is more than 2 O mm, the proportion of coarse particles increases and the coatus strength increases. descend. On the other hand, if the classified particle size is less than 1 'mm, the proportion of fine particles increases, and the proportion of coal exceeding the classified particle size after separation into coal exceeding the classified particle size and coal smaller than the classified particle size. This increases the throughput in the first crushing process, thus reducing productivity. Fig. 3 is a graph illustrating the production cost of Kotas when the classified particle size in the classification process is changed. Coat strength increases as the classified particle size decreases, and the higher the Cotas strength, the lower the reflectivity (R o) of the coal used (mixed coal). After all, the classification particle size is small The cost of blended coal per unit production of Kotas decreases, and the merit in terms of cost increases (A in Fig. 3). On the other hand, the charging amount per kiln of the coke oven increases as the classified particle size increases, and the larger the charging amount per kiln, the higher the production amount of Kotas, which is the cost per unit production of Kotas. The production costs of Cotas will decrease, and the benefits in terms of cost will increase (B in Figure 3). Therefore, the total cost (C in Fig. 3), which is the cost of the production of coatus per unit production of coatas as a whole, decreases when the classified particle size is about 20 mm or less, and the classified particle size is 3 to 10 When it is about mm, it tends to be particularly low. Therefore, it is desirable in terms of cost to have a classified particle size of 1 to 20 mm, particularly preferably about 3 to 10 mm. The coatus strength was evaluated by the drum strength (D 1 3 0/1 5) of coatus. The amount of charge per kiln was evaluated with a kiln charge index that represents the filling rate of coal into the coke oven. If the particle size distribution of the coking coal is in a certain range, it is preferable that the proportion on the small particle side is large, so that the desired classified particle size is 3 to 6 mm. The classified particle size can be easily adjusted, for example, by changing the mesh of the sieve when classifying coal. Next, the production equipment for the coatus of the present invention will be described.

In order to carry out the above-mentioned production method of Kotas, a classifier for classifying a part of the coal as the Kotas raw material into coal having a large particle size and coal having a small particle size, and pulverizing the coal having a large particle size A first pulverizer, a blending tank for blending the coal treated by the first pulverizer, the coal having a small particle diameter and the remainder of the coal as the coke raw material, and a coal blended in the blending tank It is preferable to use a coatus production facility characterized by comprising a pulverizer for pulverizing the coal and a conveyor for transporting the coal treated by the pulverizer to a coke oven.

Also, the quality of coal, such as hardness and inert amount, varies depending on the brand, and it is desirable to adjust the pulverization conditions for each brand. Therefore, distribution It is preferable to place multiple combined tanks according to the quality or brand of coal, and multiple breakers corresponding to the coal tank. Are classified into a coal with a large particle size and a coal with a small particle size, a first pulverizer for pulverizing the coal with a large particle size, and coal treated with the first pulverizer, A first blending tank for blending the coal having a small particle diameter, a second powder mill for grinding the coal blended in the first blending tank, and the remainder of the coal as the coatus raw material A second compounding tank, a third pulverizer for pulverizing the coal compounded in the second compounding tank, a coal treated with the second pulverizer and a third pulverizer. Cotas, which is characterized by comprising a transporter for transporting fresh coal to a coke oven. It is preferable to use an elephant facilities. In addition to storing coal, blending tanks have the effect of homogenizing the properties of coal when charging into a coke oven by sequentially charging multiple brands of coal and cutting them into the mixing tank after storage. Only a single brand of coal may be stored in the same blending tank, but if it is mixed with other brands of coal on the conveyor after crushing, the brand of coal charged in the coke oven Is prevented from being partially biased.

Further, a sieve for classifying a part of the coal carried out from the coal yard, a first crusher for crushing the coal on the sieve classified by the sieve, and pulverizing with at least the first crusher A first blending tank that mixes and stores the coal that has been classified by the sieve and the sieve that has been classified by the sieve, a second pulverizer that powders the coal cut out from the first blending tank, A second compounding tank for storing the remaining coal transported from the coal yard, a third pulverizer for pulverizing the coal cut out from the second compounding tank, and the second pulverizer. It is preferable to use the production equipment of Kortas characterized by comprising a transporter for transporting the coal dusted in the above and the coal dusted by the third duster to a coke oven. In the first mixing tank, coal other than coal classified by sieving can be stored. The mixing ratio of coal increases and the quality of product coatas becomes more uniform.

Furthermore, it is desirable that the pulverization capacity of the first pulverizer is greater than the pulverization capacity of the second pulverizer. As explained above, since only coal with a large particle size is pulverized in advance by the first pulverizer, the “second pulverizer” has smaller powdering capacity than the “first pulverizer”. It is desirable to use

FIG. 1 is a schematic view showing an embodiment of the production equipment for coatus according to the present invention.

Of coal yard 1 and 2, a part of coal in coal yard 1 is unloaded and sieved with sieve 3, and the sieve a that exceeds the predetermined particle size is pulverized by first pulverizer 4 Charge to the first mixing tank 5. Sieve b is put in the first mixing tank 5 as it is. The remaining coal in Coal Yard 1 will be transported to the first blending tank 5 and second blending tanks 6 and 7 as they are. Coal Yard 2 coal is also transported to the first blending tank 5 and second blending tanks 6 and 7 as appropriate. The coal in the first mixing tank 5 is appropriately pulverized by the second pulverizer 8. The coal in the second mixing tank 6 is the third pulverizer 9, the coal in the second mixing tank 7 is pulverized in the third pulverizer 10 as appropriate, and the coal pulverized in each pulverizer is a competitor, etc. By being transported while being mixed in, it is homogenized to some extent and charged into the coke oven.

In Fig. 1, the second blending tanks 6 and 7 are each installed in three tanks. The coal in the second blending tank 6 is crushed by the third powder mill 9 and the coal in the second blending tank 7 is the third. By crushing with a crusher 10, crushing by brand can be performed.

When using non-slightly cohesive coal and strongly caking coal as raw coal, it is desirable that coal yard 1 be non-slightly caking coal and coal yard 2 be strongly caking coal. Example 1

Cotas were produced using the coke production equipment shown in Fig. 1. The raw coal is 80% non-fine-coking coal and 20% strong-coking coal (HGI: approx. 85, The amount of non-mineral cohesive coal (HG I: approx. 75, the amount of inert acid approx. 36%) of the non-mineral cohesive coal is 10%. (Classification process) On a sieve with a size of more than 6 mm, pulverize with a hammerhead type first pulverizer at 680 rpm (first pulverization process). After throwing it into the first mixing tank together with some coal of 6 mm or less, it was pulverized (second pulverization step) at 570 rpm with a hammerhead type second pulverizer. The remaining non-mineral coking coal and strong caking coal are separately pulverized at 600 rpm with a plurality of hammerhead-type third crushers (third crushing step) and sieved. Coat was mixed with pulverized non-thin coal on a conveyor and charged into a coke oven to produce Cotas.

(Example of the present invention) As comparative example 1, non-slightly coking coal and strongly caking coal are separately pulverized (equivalent to the third pulverization step), mixed on a conveyor, and charged into coke trough. The production of Kotas by the method was also carried out. Further, as Comparative Example 2, a coatus was produced in the same manner as in the present invention except that the classification step was not performed.

Fig. 2 shows the coal powder before charging the coke oven manufactured using the method of the present invention.

The particle size distribution of (mixed coal) is shown. It also shows the particle size distribution of the blended coal in the conventional case, which is Comparative Example 1 and does not use the classification step and the first grinding step. Also shown is the particle size distribution of the blended coal in Comparative Example 2, which does not use only the classification process. When the method of the present invention is used, it can be seen that the particle size distribution is narrower than in Comparative Example 1 and Comparative Example 2, and that coal particles having a preferred particle size in the range of 0.5 to 6 mm are increased. .

The drum strength (DI) of the manufactured Kotas was measured. The drum strength (DI 30 No. 15) of the coatus produced by the method of the present invention is 94.2, and the drum strength (DI 30/1/5) of the conventional coatus of Comparative Example 1 and Comparative Example 2 is 94.2. Compared to 94.0 and 94.1 respectively, they improved by 0.2% and 0.1%, respectively. DI 3 0 Z 1 5 is 30 revolutions at a speed of 15 revolutions per minute according to the rotational strength test method of JISK 2 1 5 1 (2 Drum strength measured under the conditions of

If coke with the same level of strength as conventional is manufactured, the proportion of non-thin cohesive coal can be increased from the conventional 80 ° / ₀ , 82% to 85%, reducing the cost of coatas. I understood that I could do it. Example 2

In the same manner as in Example 1, the Kotas was manufactured using the Kotas manufacturing facility shown in FIG. As raw material coal, 80% non-microcoking coal and 20% strong caking coal (HG I: approx. 85, amount of inerting approx. 30%) are used. 30% non-thin cohesive coal (HG I: approx. 75, amount of inerting approx. 3 6%) is screened (classification process). Crush at 680 rpm with one crusher

(First pulverization step) After all the pulverized material is put into the first compounding tank together with 6 mm or less of coal under the sieve, it is 570 rpm with a hammerhead type second pulverizer. The pulverization (second pulverization step) was performed. The remaining non-mineral coking coal and strong coking coal are separately pulverized at 600 rpm with a plurality of hammerhead type third crushers (third powder process) and sieved. The pulverized non-thin coal was mixed on a conveyor and charged into a coke oven to produce a coatus (Example of the present invention). As a comparative example 1, conventional manufacturing, in which non-micro-coking coal and strong coking coal are separately pulverized (equivalent to the third pulverizing step only), mixed on a competitor and charged into a coke oven. The coke was also produced by this method. Further, as Comparative Example 2, a coatus was produced in the same manner as in the present invention except that the classification step was not performed.

The drum strength (DI) of the manufactured Kotas was measured. The drum strength (D 1 30 1 5) of the coatus manufactured by the method of the present invention is 94.3, and the drum strength (DI 3 0/1 5) of the conventional coatus of comparative example 1 and comparative example 2 is Compared to 94.0 and 94.1 respectively, they improved by 0.3% and 0.2%, respectively. If coke with the same level of strength as conventional is produced, the proportion of non-thin cohesive coal can be increased from the conventional 80%, 82% to 87%. It turns out that it can reduce. Example 3

In the same manner as in Example 1, the Kotas was manufactured using the Kotas manufacturing facility shown in FIG. As raw material coal, 80% non-microcoking coal and 20% strong caking coal (HG I: about 85, amount of inert about 30%). 30% non-thin cohesive coal (HG I: approx. 75, inert amount approx. 22%) is screened (classification process). Pulverizer at 6 80 rpm

(First pulverization step) After all the pulverized material is put into the first compounding tank together with 6 mm or less of coal under the sieve, it is 570 rpm with a hammerhead type second pulverizer. Crushing (second powdering process) was performed. The remaining non-microcoking coal and strong caking coal are separately pulverized at 600 rpm (third pulverization process) with multiple hammerhead type third pulverizers, and then sieved and pulverized. It was mixed on the conveyor together with the treated non-thin coking coal and charged into a coke oven to produce a coatus (Example of the present invention). As comparative example 1, non-slightly coking coal and strongly caking coal are separately pulverized (equivalent to only the third pulverization step), mixed on a competitor and charged into a coke oven. The coke was also produced by this method. Further, as Comparative Example 2, a coatus was produced in the same manner as in the present invention except that the classification step was not performed.

The drum strength (D I) of the manufactured Kotas was measured. The drum strength (DI 3 0 1 5) of the coatus manufactured by the method of the present invention is 94.1, and the drum strength (DI 3 0/1 5) of the conventional coatus of Comparative Example 1 and Comparative Example 2 is 94.1. Compared to 94.0 and 95.0%, respectively, they improved by 0.1% and 0.05%, respectively.

If you want to produce coatas with the same strength as before, It was found that the ratio of slime can be increased from the conventional 80%, 81% to 82%, and the cost of Cotas can be reduced. Industrial applicability

According to the method of the present invention, when producing coke having the same level of strength as before, the ratio of non-microcohesive coal could be increased to 80% or more, and the cost of the coata could be reduced.

Claims

The scope of the claims

1. Classifying step of classifying at least a part of coal as a raw material for coatas into a coal having a larger particle size and a coal having a smaller particle size than the coal, and a first pulverization for pulverizing the coal having a larger particle size After processing by a first blending step of blending the coal pulverized in the first dusting step and the coal having a small particle diameter, and a second dusting step of dusting the blended coal, A method for producing a coatus, comprising charging a coke oven together with the remainder of the coal used as the raw material for the coatus.

2. a classifying step of classifying a part of coal as a raw material for coal into a coal having a large particle size and a coal having a small particle size, and a first pulverizing step for pulverizing the coal having a large particle size A blending step of blending the coal treated in the first pulverization step, the small particle size coal and the remainder of the coal as the coke raw material, and a second pulverization step of pulverizing the blended coal A method for producing a coatus, comprising: charging the coke oven after the treatment.

3. a classifying step of classifying a part of the coal as a raw material for the Kotas into a coal having a large particle size and a coal having a small particle size, a first powdering step of pulverizing the coal having a large particle size, A first blending step of blending the coal treated in the first grinding step with the coal having a small particle size, and a second grinding step of grinding the blended coal; After being treated by a second blending step for blending the remainder of the coal and a third grinding step for grinding the blended coal, the coal treated with the second dusting step is loaded into a coke oven. The manufacturing method of the coatus characterized by entering.

4. A method for producing coatas using coal (X) having a high hardness and coal (Y) having a hardness lower than that of the coal (X), wherein at least a part of the coal (X) has a particle size Large coal and stone with smaller particle size than the coal A classifying step for classifying into coal, a first pulverizing step for pulverizing the coal having a large particle size, coal treated in the first pulverizing step, and the coal opi Z having the small particle size or the coal After the first blending step of blending the remainder of (X) and the second powdering step of pulverizing the blended coal, the coal (X) and the coal (Y) are coke. A manufacturing method of coatus, characterized by being charged into a furnace.

5. Coal (X) with high hardness and coal with lower hardness than the coal (X)

(Y) and a method for producing coke,

A classifying step of classifying at least a part of the coal (X) into a coal having a large particle size and a coal having a small particle size, a first pulverizing step of pulverizing the coal having a large particle size, Treated by a blending step of blending the coal treated in the grinding step, the small particle size coal, the remainder of the coal (X) and the coal (Y), and a second grinding step of grinding the blended coal And then charging the coke oven.

6. Coal (X) with high hardness and coal with lower hardness than the coal (X)

(Y) and a classification process for classifying at least a part of the coal (X) into a coal having a large particle size and a coal having a small particle size; A first pulverizing step of pulverizing a large coal, and a coal treated in the first pulverizing step and a small particle size coal and the remainder of the coal (X). Processed by a blending step and a second pulverizing step of pulverizing the blended coal, treated by a second blending step of blending the coal (Y), and a third pulverizing step of pulverizing the blended coal And then charging the coal (X) and the coal (Y) into a coke oven.

7. Coal (X) with high hardness and coal with lower hardness than the coal (X)

(Y) and a method of producing a coat, wherein at least a part of the coal (X) is classified into coal having a large particle size and coal having a small particle size, A first pulverizing step for pulverizing coal having a large particle size, a first compounding step for combining the coal treated in the first pulverizing step and the coal having a small particle size, and the blended coal A second pulverizing step, and a second compounding step of separately combining the remainder of the coal (X) and the coal (Y), and a third pulverizing the compounded coal separately. A process for producing a coatus, comprising: charging the coal (X) and the coal (Y) into a coke oven after treating in a grinding step.

8. A method for producing coatus using coal (X ′) having a large amount of inert and coal (Y,) having a smaller amount of inert than the coal (X,), wherein the amount of coal (X ′) is less A classification step of classifying a part of the coal into a coal having a larger particle size and a coal having a smaller particle size than the coal, a first powdering step of pulverizing the coal having a larger particle size, and the first pulverization step. Treated by a first blending step of combining the treated coal with the small-sized coal opi or the remainder of the coal (χ ′), and a second grinding step of grinding the blended coal And then charging the coal (X ′), the coal (Υ ′), and a coke oven.

9. A method for producing coke using coal (Χ,) with a large amount of inert gas and coal (Υ,) with a smaller amount of inert than the coal (Χ,), wherein the amount of said coal (χ,) is less Both of them were classified in a classification process for classifying a part of coal into a coal with a large particle size and a coal with a small particle diameter, a first pulverization process for pulverizing the coal with a large particle diameter, and the first pulverization process. After processing by the compounding process which mix | blends coal, the remainder of coal and said coal (X '), and the said coal (X'), and the 2nd grinding | pulverization process which pulverizes this compounded coal A method for producing a coatus, characterized by being charged into a coke oven.

1 0. A method for producing coatus using coal (X,) having a large amount of inert and coal (Υ ') having a smaller amount of inert than the coal (X'), wherein the coal (X ' ) At least a part thereof is classified into a coal having a large particle size and a coal having a smaller particle size than the coal, a first pulverizing step of pulverizing the coal having a large particle size, A first blending step of blending the coal treated in the pulverization step with the small particle size coal and the remainder of the coal (X ′), and a second pulverization step of pulverizing the blended coal; The coal is treated by a second blending step of blending the coal (Υ ′) and a third powder milling step of pulverizing the blended coal.

A method for producing cortas characterized by charging (Χ,) and the coal (Υ ') into a coke oven.

1 1. A method for producing coatas using coal (X ′) having a large amount of inert and coal (Υ,) having a smaller amount of inert than the coal (χ,), wherein the coal (X ′) ) At least a part is classified into coal having a large particle size and coal having a small particle size, a first pulverizing step of pulverizing the coal having a large particle size, and the first pulverizing step. A first blending step of blending the treated coal and the small particle size coal, and a second grinding step of grinding the blended coal, and the remainder of the coal (X ′) and the coal (Υ ') after the second blending step of blending separately and the third blending step of separately grinding the blended coal, the coal

A manufacturing method of cortas characterized by charging (Χ,) and the coal (Υ,) into a coke oven.

Claims 1 to 2 characterized by classification into coal having a particle size set within a range of 1 2.1 to 20 mm and coal having a large particle size and coal having a small particle size. 1 The production method of coatus according to any one of 1.

1 3. A classifier that classifies a part of coal as a raw material for coatas into a coal with a large particle size and a coal with a small particle size, a first crusher that crushes the coal with a large particle size, A blending tank for blending the coal treated with one grinding machine, the coal having a small particle diameter and the remainder of the coal as the coatus raw material, a powder mill for grinding the coal blended in the blending tank, and the grinding Cotas manufacturing equipment, characterized by comprising a transporter for transporting coal processed by the machine to a coke oven.

14. A classifier that classifies a part of coal as a raw material for the Kotas into a coal with a large particle size and a coal with a small particle size, a first pulverizer that pulverizes the coal with a large particle size, A first compounding tank for compounding the coal treated with one pulverizer and the coal having a small particle size, a second powder mill for pulverizing the coal compounded in the first compounding tank, and the coke. A second blending tank for combining the remainder of the coal as a raw material, a third grinder for pulverizing the coal blended in the second blending tank, the coal treated by the second grinder, and the above A coater production facility, comprising a transporter for transporting coal treated with a third powder mill to a coke oven.

15. The coke production facility according to claim 13 or 14, wherein the pulverization capacity of the first mill is greater than the pulverization capacity of the second pulverizer.