KR20070034486A - Manufacturing method and equipment of coke - Google Patents

Abstract

The present invention provides a coke production method and a production facility capable of improving coke strength by reducing the particle size distribution of coal of coke raw materials while suppressing a decrease in productivity and an increase in cost.

Specifically, a classification step of classifying at least a portion of coal as coke raw material into coal having a larger particle size and coal having a smaller particle size, a first grinding step of grinding coal having a larger particle size, and the first grinding step After the process by the 1st compounding process of mix | blending the coal grind | pulverized with the said coal with a small particle diameter, and the 2nd grinding | pulverization process which grind | pulverizes the said blended coal, it is made into coke oven with the remainder of the coal which becomes the said coke raw material. It uses the manufacturing method of the coke characterized by charging. It is preferable to classify at least a portion of the coal (X) into coal having a larger particle size and coal having a smaller particle size than the coal using the coal (X) having a higher hardness and the coal (Y) having a lower hardness than the coal (X). Do.

Coke, coal yard, grinder, blender, sieve

Description

Production method and manufacturing equipment of coke {PROCESS FOR PRODUCTION OF COKES AND PRODUCTIVE FACILITIES THEREFOR}

The present invention relates to a method for producing coke and a production facility for use as steel raw materials.

Coke used as a steelmaking raw material deteriorates when charged into the blast furnace, so that the air permeability of the blast furnace is deteriorated. In order to manufacture high-strength coke, the particle size of coal, which is a coke raw material, is preferable as small as possible. On the other hand, coal having a small particle size has problems such as difficulty in handing when it is charged with coke. For example, it is said that it is preferable to use coal in the range of about 0.5 to 6 mm. In order to achieve such a particle size range, it is possible to make coal with a particle size of 0.5 mm to 6 mm except that it is less than 0.5 mm and greater than 6 mm by sieving and dividing the pulverized coal into a sieve. Even if it is used as, it is not a practical method because less than 0.5mm is disposed without a desirable use, a treatment cost is generated, it is not preferable in terms of production rate improvement, and the filling rate of coal in the coke oven is also lowered.

A method of adjusting the particle size by specifying only the upper limit of the particle diameter of the coke furnace charging coal, classifying the coal into a sieve having a body with a predetermined particle diameter, and the lower part of the sieve as a raw material for coke assembling and assembling on the sieve. It is known to repeat grinding and classifying the magnetic part through a sieve (for example, see Japanese Patent Application Laid-Open No. 56-32587). In the method described in Japanese Patent Application Laid-Open No. 56-32587, the body size is changed to coal rich in active ingredients (soft coal) and coal rich in active ingredients (hard coal), so that the particle size of coal having no active ingredients is reduced. As a blended raw material. Coal finely adjusted in each is mixed suitably and charged in a coke oven, and coke of a higher strength than before is manufactured.

In addition, by increasing the packing density of coal in the coke oven, productivity can be improved, and high-strength coke can be produced. The crushed coal is classified into large diameters, neutral diameters, and small particle sizes. A method for adjusting the particle size of coal for coke furnace charging is also known, in which a coal of light and small particles is crushed in a crusher, and the crushed coal is charged into a coke oven together with the neutral-diameter coal classified first. See 302662.).

However, in the method described in Japanese Patent Laid-Open No. 56-32587, it is necessary to crush repeatedly until coal smaller than a predetermined particle size becomes smaller than a predetermined particle diameter, and productivity decreases because the same coal is sieved and divided and pulverized several times. do.

In the method described in Japanese Patent Application Laid-Open No. 11-302662, the number of crushing is the maximum of two times for the same coal, but fine grains are increased because the crushed coals obtained by crushing are crushed again by the crusher. Although the distribution close to the particle size distribution state of the ideal coal which makes the state of charge closest to filling is obtained, it is not preferable in the actual industrial field. In addition, since the crushed coal is classified into three stages of allele, neutral, and small diameter, the equipment cost for dividing into sieves increases.

Moreover, the method described in Unexamined-Japanese-Patent No. 2005-154737 was developed previously by this inventor, and it classifies into the coal of the brand whose hardness is higher than a predetermined | prescribed standard, and the coal of the brand whose hardness is lower than the said predetermined standard, A technique of crushing a part of coal of a high hardness brand, then blending with the remaining uncrushed coal, and pulverizing these blended coals again is disclosed. However, this technique is still insufficient to bring the particle size distribution of coal to the appropriate range of 0.5 mm to 6 mm.

Accordingly, an object of the present invention is to solve the problems of the prior art, to reduce the productivity and to increase the cost while maintaining the particle size distribution of the coal of the coke raw material in an appropriate range, the coke production method can be improved coke strength And providing manufacturing facilities.

The characteristics of the present invention for solving such a problem are as follows.

(1) a classification step of classifying at least a portion of coal as coke raw material into coal having a larger particle size and coal having a smaller particle size, a first grinding step of grinding coal having a larger particle size, and the first grinding step After the process by the 1st compounding process of mix | blending the coal grind | pulverized with the said coal with a small particle diameter, and the 2nd grinding | pulverization process which grind | pulverizes the said blended coal, it is made into coke oven with the remainder of the coal which becomes the said coke raw material. A method for producing coke, characterized by charging.

(2) a classification step of classifying a part of coal as coke raw material into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, and coal treated in the first grinding step And a coking process for mixing the coal having a small particle diameter with the remainder of the coke raw material and the second grinding step of crushing the blended coal, and then charging the coke. Way.

(3) A classification step of classifying a part of coal as coke raw material into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, and coal treated in the first grinding step. And a second blending step of blending the coal having a small particle size with the first blending step, a second milling step of pulverizing the blended coal, and blending the remainder of the coal to be the coke raw material, and the blending. A process for producing coke, wherein the coal is charged into a coke oven together with the coal treated in the second milling step after the coal is treated by the third milling step.

(4) A method of producing coke using coal (X) having a high hardness and coal (Y) having a lower hardness than the coal (X), wherein at least a portion of the coal (X) is coal having a large particle size and the coal. A classification step of classifying coal having a smaller particle size, a first crushing step of crushing the coal having a larger particle size, and a coal treated in the first crushing step, coal having a smaller particle size and / or the coal (X). The coal (X) and the coal (Y) are charged into a coke oven after being treated by the first compounding step of blending the remainder and the second grinding step of grinding the blended coal. Manufacturing method.

(5) A method of producing coke using coal (X) having high hardness and coal (Y) having lower hardness than the coal (X),

A classification step of classifying at least a portion of the coal (X) into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, coal treated in the first grinding step and the Characterized in that it is charged into a coke oven after treatment by a compounding step of blending the coal having a small particle diameter and the remainder of the coal (X) and the coal (Y) and a second grinding step of grinding the blended coal. Method of producing coke.

(6) A method for producing coke using coal (X) having a high hardness and coal (Y) having a lower hardness than the coal (X), wherein at least a portion of the coal (X) is formed of coal having a large particle size and particle size. A classification step of classifying small coal, a first grinding step of grinding coal having a large particle size, coal treated at the first grinding step, coal having a small particle size and / or a residual portion of the coal (X) By the first blending step to be performed, the second blending step of pulverizing the blended coal, the second blending step of blending the coal (Y), and the third blending step of pulverizing the blended coal. After the treatment, the coal (X) and the coal (Y) is charged to the coke oven, characterized in that the coke production method.

(7) A method of producing coke using coal (X) having a high hardness and coal (Y) having a lower hardness than the coal (X), wherein at least a portion of the coal (X) is composed of coal having a large particle size and particle size. A classification step of classifying small coal, a first grinding step of grinding coal having a large particle size, a first mixing step of mixing coal treated at the first grinding step and coal having a small particle size, and A second blending step of treating the coal by a second milling step, separately blending the remainder of the coal (X) and the coal (Y), and a third milling of separately blending the blended coal; The process for producing coke, wherein the coal (X) and the coal (Y) are charged into a coke oven after the treatment by the step.

(8) A method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), wherein at least a part of the coal (X') has a particle size. A classification step of classifying the large coal and coal having a particle size smaller than that of the coal, a first grinding step of grinding the coal having a large particle size, coal treated in the first grinding step and coal having a small particle size and / or The coal (X ') and the coal (Y') are treated with coke after the first compounding step of blending the remainder of the coal (X ') and the second grinding step of pulverizing the blended coal. The method for producing coke, characterized in that the charge.

(9) A method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), wherein at least a part of the coal (X') has a particle size. A classification step of classifying the large coal and the small particle size coal, a first crushing step of crushing the coal having a large particle size, coal treated in the first crushing step and coal and coal (X ') having the small particle size. A process for producing coke, characterized in that it is charged into a coke oven after being treated by a compounding step of blending the remainder of the mixture with the coal (Y ') and a second grinding step of pulverizing the blended coal.

(10) A method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), wherein at least a part of the coal (X') has a particle size. A classification step of classifying the large coal and coal having a particle size smaller than that of the coal, a first grinding step of grinding the coal having a large particle size, coal treated in the first grinding step and coal having a small particle size and / or The 2nd compounding process which mix | blends the said coal (Y ') by processing by the 1st compounding process which mix | blends the remainder of the said coal (X'), the 2nd grinding | pulverization process which grind | mixes the said coal | coated, and the said compounding A process for producing coke, wherein the coal (X ') and the coal (Y') are charged into a coke oven by treating the coal by a third crushing step.

(11) A method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), wherein at least a part of the coal (X') has a particle size. A classification step of classifying the large coal and the small particle coal, a first grinding step of grinding the coal having a large particle size, and a first compounding compound of the coal treated in the first grinding step and coal having a small particle size; A second blending step of treating the blended coal by a second milling step of pulverizing the blended coal and separately blending the remaining portion of the coal (X ') and the coal (Y'); and the blended coal The process for producing coke, characterized in that the coal (X ') and the coal (Y') are charged into a coke oven after the treatment is carried out by a third grinding step of separately grinding.

(12) The method for producing coke according to any one of (1) to (11), wherein the particles are classified into coal having a large particle size and coal having a small particle size with a particle size set within a range of 1 to 20 mm.

(13) A classifier for classifying a part of coal as coke raw material into coal having a large particle size and coal having a small particle size, a first grinder for grinding coal having a large particle size, coal treated with the first grinder and the particle size A mixing tank for blending the small coal and the remainder of the coke raw material, a grinder for grinding the coal blended in the blending tank, and a conveyer for conveying the coal treated by the grinder into the coke oven. Manufacturing equipment for coke.

(14) A classifier for classifying a part of coal as coke raw material into coal having a large particle size and coal having a small particle size, a first grinder for grinding coal having a large particle size, coal treated with the first grinder and the particle size In the 1st mixing tank which mix | blends this small coal, the 2nd grinder which grind | pulverizes the coal mix | blended in the said 1st mixing tank, the 2nd mixing tank which mix | blends the remainder of the coal which becomes the said coke raw material, and the said 2nd mixing tank And a third mill for pulverizing the blended coal, and a conveyer for conveying the coal treated with the second mill and the coal treated with the third mill into a coke oven.

(15) The coke production equipment according to (13) or (14), wherein the grinding capacity of the first grinder is larger than that of the second grinder.

1 is a schematic view of one embodiment of a coke manufacturing plant of the present invention.

2 is a graph showing the particle size distribution of the coal blend.

3 is a graph showing a relationship between classification particle size and coke production cost in a classification step.

※ Explanation of symbols for main parts of drawing

1: coal yard 2: coal yard

3: sieve 4: the first grinder

5: 1st mixing tank 6: 2nd mixing tank

7: 2nd mixing tank 8: 2nd grinder

9: third grinder 10: third grinder

a: above the body b: below the body

In the present invention, at least a part of the coal, which is a raw material of coke, is divided into coal having a large particle size and coal having a small particle size, and then pulverized to coal having a large particle size, and then the coal having a small particle size is pulverized again in a mixed state. Coke is prepared by charging into a furnace. That is, at least a part of coal as coke raw material is classified into coal having a larger particle size and coal having a smaller particle size than the coal, a first grinding step of grinding coal having a larger particle size, and a first grinding step. After processing by the 1st compounding process which mix | pulverizes the pulverized coal and the said small particle diameter, and the 2nd grinding | pulverization process which grind | pulverizes the said coal blended, it is charged to a coke oven with the remainder of the coal which becomes the said coke raw material. It is a manufacturing method of coke characterized by the above-mentioned. The classification of coal having a large particle size and coal having a small particle size is sufficient to divide the sieves using a sieve, so that the classification process uses a sieve, for example, to classify the coal above and below the sieve. Grinding is carried out in the first grinding step on a sieve having a larger particle size than the body, and the particle size is reduced. The first pulverization step is not performed on the lower part of the sieve having a particle size smaller than the body size, and after mixing with the sieve subjected to the first pulverization step (first compounding step), the pulverizing treatment is performed in the second crushing step. In the first compounding step, it is sufficient to add coal having a large particle size and coal having a small particle size to a mixing tank or the like to form a mixed state. There is no need to provide a special mixing means in the following compounding step. By pulverizing only the coal having a large particle size in advance (first grinding step), the proportion of coal having a large particle size is reduced. As a result, the ratio of granulation decreases, which makes it possible to pulverize the pulverizing capacity in the second pulverizing step, whereby the generation of coal having a small particle size during the pulverizing treatment in the second pulverizing step is prevented. It is suppressed and the particle size distribution of coal as a whole is improved. Coal on a sieve having a large particle size is pulverized in the first crushing step, and then again pulverized in the second crushing step together with the sieve without repeating sifting and dividing, and the same coal is repeatedly pulverized. There is no, and is advantageous in terms of productivity. In addition, although the coal having a large particle size exists after the first grinding step, it is properly milled in the second grinding step to produce fine grains. Therefore, even after grinding in the first grinding step and the second grinding step, coal having a large particle size as classified on the sieve in the classification step is present at a certain ratio, compared with the case where the first grinding step is not performed. The ratio is falling sufficiently.

Therefore, in the "second grinding process", it is preferable to make the grinding capacity smaller than the "first grinding process", for example, to use a grinding device having different grinding capacity in the "first grinding process" and the "second grinding process". In the "second grinding step", the number of revolutions of the shredding knife of the grinding device can be reduced so as to reduce the grinding capacity than the "first grinding step".

In the case where all of the coal as coke raw material is treated in the above classification process and the first crushing step, the remainder of the coal as coke raw material is natural but does not exist. On the other hand, when only a part of the coal which is a coke raw material is treated in the above-mentioned classification process and the 1st grinding process, the remainder of the coal which becomes the coke raw material is charged to a coke oven with the coal processed by the classification process and the 1st grinding process. . That is, a classification step of classifying a part of coal as coke raw material into coal having a large particle size and coal having a small particle size, a first crushing step of crushing the coal having a large particle size, and coal treated in the first crushing step; It is preferable to charge into a coke oven after processing by the mixing | blending process which mix | blends the said small particle diameter and the remainder of the coal which becomes the said coke raw material, and the 2nd grinding | pulverization process which grind | mixes this blended coal.

In the case where only a part of the coal, which is the coke raw material, is treated in the classification process and the first crushing process, the quality of the coal, such as hardness and amount of inert, varies depending on the brand, and it is preferable to grind by adjusting the grinding conditions for each brand. Therefore, it is preferable to arrange a plurality of mixing tanks according to the quality or brand of coal, and to arrange a plurality of crushers in correspondence with them, and to separately grind the coal in the remaining part. That is, a classification step of classifying a part of coal as coke raw material into coal having a large particle size and coal having a small particle size, a first crushing step of crushing the coal having a large particle size, and coal pulverized in the first crushing step; The first blending step of blending the coal having a small particle diameter and the second grinding step of pulverizing the blended coal, wherein the remainder of the coal serving as the coke raw material is blended with the remainder of coal serving as the coke raw material. It is preferable to grind | pulverize by the 2nd mixing process and the 3rd grinding | pulverization process which grind | mixes the said coal, and to charge together with the coal grind | pulverized at the said 2nd grinding | pulverization process, and to charge into a coke oven. The remainder of the coal, which is coke raw material, which is not treated in the classification step, may be omitted in the case of fine grains or a particle size distribution suitable for charging into the coke oven.

In addition, when only a part of coal used as a coke raw material is processed by said classification process and a 1st grinding process, it is preferable to process hard coal preferentially. That is, when coke is manufactured using coal (X) having a higher hardness and coal (Y) having a lower hardness than the coal (X), at least a part of the coal (X) having a high hardness is coal having a larger particle size and the coal. A classification step of classifying coal having a smaller particle size, a first crushing step of crushing the coal having a larger particle size, and a coal treated in the first crushing step, coal having a smaller particle size and / or the coal (X). It is preferable to charge the said coal (X) and the said coal (Y) to a coke oven after processing by the 1st compounding process which mix | blends a remainder, and the 2nd grinding | pulverization process which grind | mixes the said coal blended.

Moreover, coal (Y) can also be mix | blended in a 1st compounding process, and it can grind | pulverize by a 2nd grinding process. That is, a method for producing coke using coal (X) having high hardness and coal (Y) having lower hardness than the coal (X), wherein at least a part of the coal (X) is made of coal having a large particle size and small particle size. A classification step of classifying coal, a first grinding step of grinding coal having a large particle size, coal processed in the first grinding step, a residual portion of coal and coal (X) having a small particle size, and the coal (Y) It is preferable to charge into a coke oven after processing by the compounding process of mix | blending) and the 2nd grinding | pulverization process which grind | pulverizes the said coal mix.

In addition, the quality of the coal, such as hardness and the amount of inert, varies depending on the brand, and it is preferable to grind by adjusting the grinding conditions for each brand. Therefore, it is preferable to arrange a plurality of mixing tanks according to the quality or brand of coal, and to arrange a plurality of crushers in correspondence therewith, and to use coal (X) having a higher hardness and coal (Y) having a lower hardness than the coal (X). A method for producing coke, comprising: a classification step of classifying at least a portion of the coal (X) into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, and the first grinding The coal (Y) is treated by a first blending step of blending the coal treated in the step, the coal having a small particle size and / or the remainder of the coal (X), and a second grinding step of grinding the blended coal. ) And the coal (X) and the coal (Y) are preferably charged into a coke oven after the treatment is carried out by a second compounding step of blending the compound) and a third grinding step of pulverizing the blended coal.

In addition, in the above, it is also possible to mix | blend the remainder of coal X and coal Y separately using a mixing tank, and to grind | pulverize for each mixing tank. That is, a method for producing coke using coal (X) having high hardness and coal (Y) having lower hardness than the coal (X), wherein at least a part of the coal (X) is made of coal having a large particle size and small particle size. A classification step of classifying coal, a first grinding step of grinding coal having a large particle size, a first grinding step of mixing coal treated at the first grinding step with coal having a small particle size, and the coal blended Is processed by a second crushing step of crushing, a second blending step of separately mixing the remainder of the coal (X) and the coal (Y), and a third crushing step of separately crushing the blended coal. After the treatment by, it is preferable to charge the coal (X) and the coal (Y) into the coke oven.

In addition, as a method for producing coke using coal (X) having a higher hardness and coal (Y) having a lower hardness than the coal (X), at least a portion of the coal (X) is made of coal having a large particle size and coal having a small particle size. At least a part of the remaining portion of the fractionation step of classifying the gas in the first step, the first grinding step of grinding the coal having a large particle size, the coal treated at the first grinding step, the coal having a small particle size and / or the coal (X) And / or coal, which is a residual portion which is processed by a first blending step of blending at least a portion of the coal (Y) and a second milling step of milling the blended coal, and not processed by the second milling step. It is also possible to select the coal (X) and the coal (Y) into the coke oven after the treatment by the second compounding step to be blended and the third milling step to grind the blended coal as a preferable method. .

Coal raw material, usually made of plural brands, is divided into coal (X) having a higher hardness and coal (Y) having a lower hardness than the coal (X). It is good to classify into high coal X and coal Y whose hardness is lower than predetermined reference | standard. For example, when coke is manufactured using coal brands A, B, and C, coal brands A with the highest average hardness are classified as hard coal (X), and coal brands B and C are coal with low hardness. Classify as (Y). In the case of using coal brands D, E, and F, which are lower in hardness than coal brands A, B, and C, the predetermined criteria are set lower and coal brands D, which are relatively hard, are selected from coal brands D, E, and F. Can be classified as high coal (X). It is desirable to set predetermined criteria to optimize the cost and production efficiency of the coke production in consideration of the brand of raw coal used and the capacity of the coke production facility. Moreover, as is clear from the above example, the coal (X) having high hardness and the coal (Y) having low hardness are each not limited to a single brand but have a case of being composed of a plurality of brands of coal.

The reason why hard coal is preferentially treated in the first grinding process is that coal having a large particle size is mainly coal having a high hardness, and productivity can be improved by increasing the number of times of hard coal that is difficult to grind. to be. That is, when all raw coal is not processed in a classification process and a 1st grinding process, it is preferable to give priority to coal (X) with high hardness, and to classify and grind it. If only a part of the coal (X) is treated in the classification step and the first crushing step, it is effective. For example, the coal is classified into coal having a large particle size and coal having a small particle size, and the pulverizing treatment is performed on coal having a large particle size. Even if the amount of coal to be carried out is about 10% of the total amount of coal, the particle size distribution can be remarkably improved as a whole by first classifying and pulverizing coal (X) in the entire raw material. The classification of coal (X) and other coals is not exact, and if the average hardness is prescribed for each brand of coal and the average hardness exceeds a predetermined standard, it may be classified as coal (X). It does not interfere even if it contains coal of hardness below a predetermined standard partially. Although the particle size distribution improves as the ratio of processing in the classification process and the 1st grinding | pulverization process in coal X increases, a process cost also raises.

It is known that coal differs in hardness depending on the production region. It is preferable to use HGI as a predetermined criterion when classifying coal (X) when the high hardness is first treated in the classification step and the first crushing step, and HGI (Hard Grove Index: It is preferable to set it as coal (X) whose thing (in accordance with JIS-M-8801) is 80 or less. It is most preferable to use non-viscosity coal as coal whose HGI is 80 or less. Non-viscosity coal has a high hardness of HGI 180 or less, and is also inexpensive coal. Determination of the hardness of the coal with respect to a predetermined criterion can be performed by, for example, measuring the average HGI for each brand of coal and comparing their average value with a predetermined criterion.

Moreover, when only a part of the coal used as a coke raw material is processed in the said classification process and a 1st grinding process, it is preferable to process the coal with a large amount of inerts preferentially. That is, a method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), wherein at least a part of the coal (X') has a particle size. A classification step of classifying large coal and coal having a particle size smaller than that of the coal, a first grinding step of grinding the coal having a larger particle size, coal treated in the first grinding step, coal having a smaller particle size, and / or the The coal (X ') and the coal (Y') are subjected to the coke oven after treatment by a first compounding step of blending the remaining portion of coal (X ') and a second grinding step of pulverizing the blended coal. It is preferable to charge.

On the other hand, it is also possible to mix | pulverize coal Y 'with a small amount of inerts with coal (X') with a large amount of inerts. A method of manufacturing coke using coal (Y ') having a smaller amount of inert than coal (X'), comprising: a classification step of classifying at least a portion of the coal (X ') into coal having a large particle size and coal having a small particle size; And a first crushing step of crushing the coal having a large particle size, and a mixture for mixing the coal treated in the first crushing step, the remaining portion of the coal having a small particle size, coal (X ') and the coal (Y'). It is preferable to charge into a coke oven after processing by the process and the 2nd grinding | pulverization process which grind | mixes the said coal.

In addition, the quality of the coal, such as hardness and the amount of inert, varies depending on the brand, and it is preferable to grind by adjusting the grinding conditions for each brand. Therefore, it is preferable to arrange a plurality of blending tanks according to the quality or brand of coal, and to arrange a plurality of crushers in correspondence therewith. A method for producing coke using '), comprising: a classification step of classifying at least a portion of the coal (X') into coal having a larger particle size and coal having a smaller particle size than the coal; 1 The grinding | pulverization process, the 1st compounding process which mix | blends the coal processed by the said 1st grinding | pulverization process, the said coal with a small particle size, and / or the said coal (X '), and the 2nd grinding | pulverization which grind | pulverizes this mix | blended coal. The coal (X ') and the coal (Y') are treated by a second blending step of blending the coal (Y ') and a third milling step of pulverizing the blended coal. Charging to coke oven This is preferred.

In addition, in the above, it is preferable to mix | blend the remainder of coal (X ') and coal (Y') using a mixing tank separately, and grind | pulverize for each mixing tank. That is, a method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), wherein at least a part of the coal (X') has a particle size. A classification step of classifying large coal and small particle coal, a first grinding step of grinding the coal having a large particle size, and a first mixing step of mixing the coal treated in the first grinding step and coal having a small particle size; And a second blending step of treating the blended coal by a second grinding step of grinding the blended coal, separately blending the remainder of the coal (X ') and the coal (Y'), and the blended coal. It is preferable to charge the said coal (X ') and the said coal (Y') to a coke oven after processing by the 3rd grinding process which grinds separately.

In addition, as a method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), at least a part of the coal (X') has a large particle size. A classification step of classifying coal and coal having a particle size smaller than that of the coal, a first crushing step of crushing the coal having a large particle size, coal treated in the first crushing step, coal having a small particle size and / or the coal The first compounding step of blending at least a part of the remaining portion of (X ') and / or at least part of the coal (Y') and the second milling step of grinding the blended coal; The coal (X ') and the coal (Y') are subjected to coke by treating them by a second compounding step of blending the remaining coal, which is not processed by the grinding step, and a third grinding step of grinding the blended coal. It is also a preferable method to charge in You can choose.

When coal which is a coke raw material is used as a large amount of inert, it is easy to produce a crack in the manufacturing process of coke, and there exists a tendency for the intensity | strength of the coke manufactured to fall. Therefore, when charging into a coke oven, it is preferable to disperse | distribute as much as possible, and also for this purpose, it is preferable to grind | pulverize with fine grains. Therefore, the coke strength can be improved by increasing the number of pulverization of coal with a large amount of inert. Therefore, when all raw coal is not processed in a classification process and a 1st grinding process, it is preferable to give priority to coal (X ') with a large amount of inerts, and to classify and grind it. Partial coal (X ') treatment in the classification process and the first crushing step is effective. For example, the coal is separated into coal having a large particle size and coal having a small particle size, and pulverized to coal having a large particle size. Even if the amount of coal is about 10% of the total amount of coal, the particle size distribution can be remarkably improved as a whole by first classifying and pulverizing coal (X ') in the whole raw material. The classification of coal (X ') and coal other than that is not exact, and if the average value of an inert is prescribed | regulated for each brand of coal, if the average value exceeds predetermined | prescribed standard, it may classify as coal (X'), and coal (X ') May partially contain coal of hardness below a predetermined standard. Although the coke strength increases as the ratio of processing in the classification process and the 1st grinding | pulverization process among coal (X ') increases, a process cost also raises.

It is known that the amount of inert (non-melt component) of coal varies with the production site. When treating a large amount of inert amount in the classification process and the first crushing process, the criteria for classifying coal (X ') having a large amount of inert amount are based on the brand of raw coal used and the capacity of coke production facilities. In consideration of the above, it is preferable to set appropriately so that the cost and production efficiency of the coke production are optimized, and it is particularly preferable to use coal having an inert amount of 35% or more as coal (X ') having a large amount of inert. As coal whose amount of inerts is 35% or more, it is most suitable to use non-coking coal. Non-coking coal is high in inert quantity, and is inexpensive coal. The determination of the amount of inerts of coal can be carried out, for example, by measuring the average amount of inerts for each brand of coal and comparing these average values with a predetermined standard (for example, 35% of the amount of inerts).

Therefore, when only a part of the coal which is a coke raw material is treated in the classification process and the first crushing process, the coal is classified by using both the hardness and the amount of inert, and the high-hardness and the amount of the inert are preferentially classified. It is preferable to process at a process and a 1st grinding process. Especially preferably, coal whose HGI is 80 or less and the amount of inerts is 35% or more is preferentially treated by a classification process and a 1st grinding process. Non-viscotic coal is very suitable because many varieties having an HGI of 80 or less and an inert amount of 35% or more are inexpensive.

In the classification process, when classifying coal into coal having a large particle size and coal having a small particle size, it is preferable to classify the coal into a large particle diameter and a coal having a small particle size from a particle size set within a range of 1 to 20 mm. When the classification particle size (the particle size at the time of classification, for example, the body at the time of classification using a sieve) is more than 20 mm, the ratio of granulation increases and the coke strength decreases. On the other hand, when the classification particle size is less than 1 mm, the proportion of fine grains increases, and the ratio of coal larger than the classification particle size and coal larger than the classification particle size after separation into coals below the classification particle size increases to increase the throughput in the first grinding process. Therefore, productivity also falls. 3 is a graph illustrating the manufacturing cost of coke when the classification particle size in the classification step is changed. The coke strength can be made larger by the small classification particle size, and can lower the reflectance (Ro) of the coal (mixed coal) used by the larger coke strength. The coke of the coal briquettes per unit output of coke decreases, and the merit in cost point becomes large (A of FIG. 3). On the other hand, the amount of coke oven charged to coke increases as the classification particle size increases, and as the amount of coke charged increases, the amount of coke increases, so the coke production cost, which is the cost per unit of coke, decreases. Merits increase (FIG. 3B). Therefore, the total cost (C of FIG. 3), which is the cost of producing coke per unit output of coke as a whole, tends to be particularly low when the classification particle size drops to about 20 mm or less and the classification particle size is about 3 to 10 mm. Therefore, what is preferable at the point of cost is 1-20 mm of classification particle diameters, Especially preferably, it is about 3-10 mm. In addition, the coke strength was evaluated by the coke drum strength (D130 / 15). The kiln charge amount was evaluated by the kiln charge index indicating the filling rate of the coke oven coal. If the particle size distribution of the raw coal is a constant range, it is preferable that the ratio of the small particle side is large, and thus the more preferable classification particle size is 3 to 6 mm. The classification particle size can be easily adjusted by changing the body of the sieve when classifying coal, for example.

Next, the manufacturing apparatus of the coke of this invention is demonstrated.

A classifier for classifying a part of coal, which is a coke raw material, into a coal having a large particle size and a coal having a small particle size for carrying out the method for producing coke, a first grinder for grinding coal having a large particle size, and a first grinder. A blending tank for blending the coal treated with the coal, the remainder of the coal having a small particle size and the coke raw material, a grinder for milling the coal blended in the blending tank, and conveying the coal treated with the grinder to the coke oven. It is preferable to use the coke manufacturing equipment which consists of a conveyer for the said.

In addition, the quality of the coal, such as hardness and the amount of inert, varies depending on the brand, and it is preferable to grind by adjusting the grinding conditions for each brand. Therefore, it is preferable to arrange a plurality of blending tanks by the quality or brand of coal, and to arrange a plurality of crushers in correspondence therewith, and to use a second blending tank and a third grinder, and a part of the coal which is a coke raw material is coal having a large particle size. And a classifier for classifying coal having a small particle size, a first grinder for milling the coal having a large particle size, a first blending tank for blending coal treated with the first mill and the coal having a small particle size, and the first blending. A second grinder for pulverizing coal blended in the tank, a second blending tank for blending the remainder of the coal to be the coke raw material, a third grinder for pulverizing coal blended in the second blending tank, and the second grinder Using a coke manufacturing facility, characterized in that it comprises a conveyer for conveying the coal treated by the furnace and the coal treated by the third mill to the coke oven. Is preferred.

In the mixing tank, in addition to storing coal, a plurality of brands of coal are sequentially charged and cut after storage in the mixing tank to effect homogenization of coal properties when charged into the coke oven. In some cases, only a single brand of coal is stored in the same blending tank. If the coal is mixed with other brands of coal on the conveying machine after crushing, the brand of coal charged into the coke oven is prevented from being partially biased.

In addition, a sieve for classifying a portion of coal taken out from the coal yard, a first grinder for milling coal on a sieve classified by the sieve, and at least the coal milled with the first mill A first blending tank for mixing and storing coal under the sieve, a second grinder for pulverizing coal cut out from the first blending tank, a second blending tank for storing coal in the remaining part carried out from the coal yard; And a third grinder for pulverizing coal cut out from the second mixing tank, and a conveyer for conveying coal pulverized by the second grinder and coal pulverized by the third grinder to a coke oven. It is preferable to use the production equipment of. Coal other than the coal classified by the sieve can also be stored in a 1st mixing tank, In that case, the mixing rate of the coal of a different brand becomes high, and the quality of a product coke becomes more homogeneous.

It is also preferable that the grinding capacity of the first grinder is larger than that of the second grinder. As described above, since only the coal having a large particle size is crushed in advance with the first grinder, it is preferable that the "second grinder" has a smaller grinding capacity than the "first grinder".

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows one Embodiment of the manufacturing apparatus of the coke of this invention.

Of the coal yards 1 and 2, a part of coal of the coal yard 1 is taken out and sieved by the sieve 3, and the sieve a which exceeds predetermined particle diameter is crushed by the 1st grinder 4 It processes and throws into the 1st mixing tank 5. The sieve bottom (b) is thrown into the 1st mixing tank 5 as it is. About the remainder of the coal of the coal yard 1, it carries out to the 1st mixing tank 5 and the 2nd mixing tank 6 and 7 suitably as it is. The coal of the coal yard 2 is also carried out to the 1st mixing tank 5 and the 2nd mixing tanks 6 and 7 suitably. Coal in the first blending tank 5 is pulverized by the second mill 8 as appropriate. The coal of the second blending tank 6 is properly crushed by the third mill 9 and the coal of the second blending tank 7 by the third grinder 10, and the coal pulverized by each grinder is mixed by a conveyor or the like. It is conveyed, being homogenized to some extent, and charged in a coke oven.

In the FIG. 1, three tanks of the 2nd mixing tanks 6 and 7 are provided, the coal of the 2nd mixing tank 6 is crushed by the 3rd grinder 9, and the coal of the 2nd mixing tank 7 is It is crushed by the 3rd grinder 10, and crushing by brand can be performed.

In the case of using non-coking coal and coking coal as raw material coal, it is preferable to use non-coking coal and coal yard 2 as coking coal.

Example 1

Coke was manufactured using the coke manufacturing apparatus shown in FIG. As raw material coal, non-coking coal (HGI: 80% of non-coking coal) and 20% of coking coal (HGI: about 85, about 30% of the amount of inerts) are used. About 75 and about 36% of the amount of inerts are divided into sieves (classification step). For the sieves larger than 6 mm, the whole grinding machine is pulverized at 680 rpm by the first hammerhead type grinder (first grinding step). After inject | pouring into a 1st mixing tank with 6 mm or less coal, it grind | pulverized (2nd grinding | pulverization process) at 570 rpm with the hammerhead type 2nd grinder. The remaining non-coking coal and strong coking coal are separately pulverized at 600 rpm by a plurality of hammerhead-type third grinders (third grinding process), sieved, mixed with the non-coal coals, and then crushed to a coke oven. It charged and manufactured the coke (Example of this invention). As Comparative Example 1, coke production was also carried out in a conventional production method in which non-coking coal and coking coal are separately pulverized (corresponding to the third grinding step only), mixed on a conveyor, and charged into a coke oven. As Comparative Example 2, coke was produced in the same manner as in the present invention except that the classification step was not performed.

Fig. 2 shows the particle size distribution of coal powder (blended coal) before charging the coke oven manufactured using the method of the present invention. The particle size distribution of the coal blend in the case of the conventional case which does not use the classification process of Comparative Example 1 and a 1st grinding process is also shown together. Moreover, the particle size distribution of the coal blend in the case of the conventional case which did not use only the classification process of the comparative example 2 is also shown together. In the case of using the method of the present invention, it can be seen that compared with Comparative Example 1 and Comparative Example 2, the particle size distribution is narrowed, and the coal grains having a preferable particle size in the range of 0.5 to 6 mm are increased.

The drum strength (DI) of the manufactured coke was measured. The drum strength (DI30 / 15) of the coke produced by the method of the present invention was 94.2, and the drum strength (DI30 / 15) of the conventional coke of Comparative Example 1 and Comparative Example 2 was respectively 94.0 and 94.1, respectively 0.2 % And 0.1% were improved. DI30 / 15 is the drum strength measured on the condition of 30 revolutions (2 minutes) at the speed of 15 revolutions for 1 minute by the rotational strength test method of JIS K2151.

When producing coke having the same strength as in the prior art, it has been found that the ratio of non-coking coal can be increased from the conventional 80%, 82% to 85%, and the cost of the coke can be reduced.

Example 2

In the same manner as in Example 1, coke was manufactured using the coke manufacturing equipment shown in FIG. 1. Non-viscosity coal (HGI: about 75) which uses up to 30% of the total amount of coal in the non-viscosity coal by using 80% non-viscotic coal and 20% cohesive coal (HGI: about 85, about 30% of inert amount) as the raw material coal. Sieve (about 36% of the amount of inert) into sieves (classification step), and for the sieves larger than 6 mm, the grinding head was pulverized at 680 rpm (the first grinding step) with a hammerhead first grinder (6 mm below the sieve). After putting into the 1st mixing tank with the following coals, it grind | pulverized (2nd grinding | polishing process) at 570 rpm with the hammerhead type 2nd grinder. The remaining non-coking coal and strong coking coal are separately pulverized at 600 rpm by a plurality of hammerhead-type third grinders (third grinding process), sieved, mixed with the non-coal coals, and then crushed to a coke oven. It charged and manufactured the coke (Example of this invention). As Comparative Example 1, coke production was also carried out in a conventional production method in which non-coking coal and coking coal are separately pulverized (corresponding to the third grinding step only), mixed on a conveyor, and charged into a coke oven. As Comparative Example 2, coke 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 coke was measured. The drum strength (DI30 / 15) of the coke produced by the method of the present invention was 94.3, and the drum strength (DI30 / 15) of the conventional coke of Comparative Example 1 and Comparative Example 2 was 0.3%, respectively, compared to 94.0 and 94.1, respectively. , 0.2%.

When manufacturing coke having the same strength as in the prior art, it was found that the ratio of non-coking coal can be increased from the conventional 80%, 82% to 87%, and the cost of the coke can be reduced.

Example 3

In the same manner as in Example 1, coke was manufactured using the coke manufacturing equipment shown in FIG. 1. Non-viscosity coal (HGI: about 75) which uses up to 30% of the total amount of coal in the non-viscosity coal using 80% non-viscosity coal and 20% cohesive coal (HGI: about 85, about 30% of inert amount) as the raw material coal. And sift (about 22% of the amount of inert) into sieves (classification process). For sieves exceeding 6 mm, the grinding head was pulverized at 680 rpm using the first hammerhead type grinder (first grinding process). After putting into the 1st mixing tank with the following coals, it grind | pulverized (2nd grinding | polishing process) at 570 rpm with the hammerhead type 2nd grinder. The remaining non-coking coal and strong coking coal are separately pulverized (third grinding process) at 600rpm using a plurality of hammerhead-type third grinders, sieved and mixed on a conveyor with coarse non-coking coal. It charged and manufactured the coke (Example of this invention). As Comparative Example 1, coke production was carried out in a conventional production method in which non-coking coal and coking coal were separately pulverized (corresponding to the third grinding step only), mixed on a conveyor, and charged into a coke oven. As Comparative Example 2, coke 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 coke was measured. The drum strength (DI30 / 15) of the coke produced by the method of the present invention was 94.1, and the drum strength (DI30 / 15) of the conventional coke of Comparative Example 1 and Comparative Example 2 was 0.14.0 and 94.05%, respectively, respectively. % And 0.05% were improved.

When producing coke having the same strength as in the prior art, it was found that the ratio of non-coking coal can be increased from the conventional 80%, 81% to 82%, and the cost of the coke can be reduced.

According to the method of the present invention, when producing coke having the same strength as in the prior art, the ratio of non-coking coal could be increased to 80% or more, and the cost of coke could be reduced.

Claims (15)

A classification step of classifying at least a portion of the coke raw material into coal having a larger particle size and coal having a smaller particle size than that of the coal; a first grinding step of grinding coal having a large particle size; After the process by the 1st compounding process which mixes coal and the said coal with small particle diameter, and the 2nd grinding process which grind | mixes the said coal blended, it is charged to the coke oven with the remainder of the coal which becomes the said coke raw material. A method for producing coke, characterized in that. A classification step of classifying a part of the coal, which is a coke raw material, into coal having a large particle size and coal having a small particle size, a first grinding step of grinding coal having a large particle size, coal treated at the first grinding step and the particle size A process for producing coke, characterized in that it is charged into a coke oven after being treated by a compounding step of blending the small coal and the remainder of the coal as the coke raw material and a second crushing step of pulverizing the blended coal. A classification step of classifying a part of the coal, which is a coke raw material, into coal having a large particle size and coal having a small particle size, a first grinding step of grinding coal having a large particle size, coal treated at the first grinding step and the particle size The second blending step of blending the small coal and the second blending step of treating the blended coal by the second grinding step of pulverizing the blended coal and blending the remainder of the coal as the coke raw material, and the blended coal A process for producing coke, characterized in that it is charged into a coke oven together with coal treated in the second crushing step after treating by a third crushing step to grind. As a method for producing coke using coal (X) having high hardness and coal (Y) having lower hardness than the coal (X), A classification step of classifying at least a portion of the coal (X) into coal having a larger particle size and coal having a smaller particle size than the coal, a first grinding step of grinding the coal having a larger particle size, and the first grinding step. The coal (X) and the said after processing by the 1st compounding process of mix | blending coal and the said coal of small particle diameter, and / or the said coal (X), and the 2nd grinding | pulverization process of grind | pulverizing the said mix | blended coal. A method for producing coke, comprising charging coal (Y) in a coke oven. As a method for producing coke using coal (X) having high hardness and coal (Y) having lower hardness than the coal (X), A classification step of classifying at least a portion of the coal (X) into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, coal treated in the first grinding step and the Characterized in that it is charged into a coke oven after treatment by a compounding step of blending the coal having a small particle diameter and the remainder of the coal (X) and the coal (Y) and a second grinding step of grinding the blended coal. Method of producing coke. As a method for producing coke using coal (X) having high hardness and coal (Y) having lower hardness than the coal (X), A classification step of classifying at least a portion of the coal (X) into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, coal treated in the first grinding step and the 2nd compounding which mixes the said coal (Y) by processing by the 1st compounding process of mix | blending the coal of small particle diameter and / or the remainder of the said coal (X), and the 2nd grinding | pulverization process which grind | mixes the said blended coal. A process for producing coke, wherein the coal (X) and the coal (Y) are charged into a coke oven after the step is treated by the third grinding step of grinding the blended coal. As a method for producing coke using coal (X) having high hardness and coal (Y) having lower hardness than the coal (X), A classification step of classifying at least a portion of the coal (X) into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, coal treated in the first grinding step and the A second mixing step of mixing coal having a small particle diameter and a second grinding step of grinding the blended coal, and a second blending of the remaining portion of the coal (X) and the coal (Y) separately. A process for producing coke, wherein the coal (X) and the coal (Y) are charged into a coke oven after being treated by a compounding step and a third grinding step of separately crushing the blended coal. As a method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), A classification step of classifying at least a portion of the coal (X ') into coal having a larger particle size and coal having a smaller particle size than the coal, a first grinding step of grinding the coal having a larger particle size, and a first grinding step. The coal (X ') is treated by a first compounding step of blending the coal, the coal having a small particle size and / or the remainder of the coal (X'), and a second grinding step of grinding the blended coal. ) And the coal (Y ') is charged into the coke oven. As a method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), A classification step of classifying at least a portion of the coal (X ') into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, and coal treated in the first grinding step; Charging into the coke oven after treatment by the mixing step of blending the coal having a small particle diameter, the remainder of coal (X ') and the coal (Y') and the second grinding step of grinding the blended coal. A method for producing coke, characterized in that. As a method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), A classification step of classifying at least a portion of the coal (X ') into coal having a larger particle size and coal having a smaller particle size than the coal, a first grinding step of grinding the coal having a larger particle size, and a first grinding step. The coal is treated by the first compounding step of blending the coal, the coal having a small particle size and / or the remainder of the coal (X '), and the second grinding step of pulverizing the blended coal, and the coal (Y'). The coal (X ') and the coal (Y') is charged into the coke oven by the second compounding step of blending and the third milling step of grinding the blended coal. Way. As a method for producing coke using coal (X ') having a large amount of inert and coal (Y') having a smaller amount of inert than the coal (X '), A classification step of classifying at least a portion of the coal (X ') into coal having a large particle size and coal having a small particle size, a first grinding step of grinding the coal having a large particle size, and coal treated in the first grinding step; Processed by the 1st compounding process of mix | blending the said small particle diameter, and the 2nd grinding | pulverization process which grind | pulverizes the said coal mix, The remainder part of the said coal (X ') and the said coal (Y') are mix | blended separately. After the process by the 2nd compounding process and the 3rd grinding | pulverization process which grind | mixes the said coal separately, the said coal (X ') and the said coal (Y') are charged to a coke oven, The coke characterized by the above-mentioned. Manufacturing method. The method according to any one of claims 1 to 11, A method for producing coke, comprising classifying coal having a large particle size and coal having a small particle size with a particle size set within a range of 1 to 20 mm. A classifier that classifies a portion of the coal as coke raw material into a coal having a large particle size and a coal having a small particle size, a first grinder for grinding coal having a large particle size, coal treated by the first grinder, and a small particle size A mixing tank for mixing coal and the remainder of the coal as the coke raw material, a grinder for grinding the coal blended in the blending tank, and a conveyer for conveying the coal treated by the grinder into the coke oven. Coke manufacturing equipment. A classifier that classifies a portion of coal as coke raw material into coal having a large particle size and coal having a small particle size, a first grinder for grinding coal having a large particle size, coal treated with the first grinder, and coal having a small particle size 1st blending tank which mixes with, the 2nd grinder which grind | pulverizes the coal mix | blended by the said 1st blending tank, the 2nd blending tank which mix | blends the remainder of the coal which becomes the said coke raw material, and the coal blended by the said 2nd blending tank And a conveyer for conveying coal treated by the second mill and coal treated by the third mill to a coke oven. The method according to claim 13 or 14, The coking plant according to claim 1, wherein the grinding capacity of the first grinder is larger than that of the second grinder.

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