WO2011065303A1 - Process for producing high-strength coke - Google Patents

Abstract

Disclosed is a process for producing high-strength coke, the process comprising a grinding step, a mixing step, a dry distillation step, and a drying step. When the drying step is conducted before the mixing step, the feed coal is dried so that the mixture in the mixing step has a water content of 0-8 mass%. Alternatively, when the drying step is conducted simultaneously with the mixing step, the caking filler and the feed coal which have been ground are dried while being mixed, thereby forming the mixture having a water content of 0-8 mass%. Alternatively, when the drying step is conducted after the mixing step and before the dry distillation step, the mixture is dried to reduce the water content thereof to 0-8 mass%.

Description

Manufacturing method of high strength coke

The present invention relates to a method for producing high-strength coke, particularly high-strength coke for blast furnaces.
This application claims priority based on Japanese Patent Application No. 2009-266567 filed in Japan on November 24, 2009, the contents of which are incorporated herein by reference.

Coke used as a reducing material in blast furnace operation is required to have the required strength in order to ensure air permeability in the furnace. In order to produce high-strength coke, good quality caking coal is required as a raw material for coke. However, high-quality strong caking coal is in a resource-depleted state.

Therefore, many techniques for producing high-strength coke using low-quality non-caking coal or non-caking caking coal have been proposed so far.
When coke is produced using non-caking coal or non-caking caking coal, the addition of caking filler (caking filler) increases the coke strength (see, for example, Patent Documents 1 and 2). ).

Usually, tar, pitch, petroleum-based caking materials, etc. are used as caking filler. The caking filler that is liquid at room temperature, such as tar, is preferably kneaded uniformly into the raw coal. Moreover, it is preferable that the caking filler solid at room temperature such as pitch is liquefied by heating to the melting point or higher and kneaded into raw coal (for example, see Patent Document 3).

However, the liquid caking filler material may cause operational troubles such as clogging of pipes and adhesion to the kneading machine, and has a difficulty in handling. In addition, the solid caking filler requires a heating device for liquefaction, and has the disadvantages that equipment costs and operating costs are added, and manufacturing costs increase.

From these facts, a method for producing coke has been proposed in which a solid caking filler is mixed with raw coal after being pulverized (see Patent Documents 4 and 5).
More specifically, for example, in Patent Document 4, a solid caking filler containing 50% or more of fine particles having a particle size of less than 3 mm is mixed in raw coal and charged into a coke oven as it is. A method for producing high strength coke to dry distillation is described. According to the method described in Patent Document 4, since the solid caking filler is uniformly dispersed in the coal particles, a strong coke structure can be obtained.
Further, Patent Document 4 describes that in the particle size constitution of the solid caking filler, fine particles having a particle size of 0.3 mm or less are likely to aggregate, and therefore it is preferable that the number is as small as possible.

In addition, as a blended coal for a coke oven, a method for producing coke for a blast furnace using a mixture of a low-grade blended coal whose moisture has been dried to 5% or less and a hydrocarbon bitumen has been proposed (for example, Patent Documents). 6). According to the method described in Patent Document 6, since the bulk density of the charged coal is large, a strong coke structure can be obtained.

Japanese Patent Application Laid-Open No. 11-244102 JP 2001-262155 A JP-A-57-67686 JP 2007-002052 A JP 2007-063350 A Japanese Patent Laid-Open No. 51-41701

However, when the solid caking filler is crushed and used as a solid, fine particles having a particle size of 0.3 mm or less are generated during pulverization. As described above, fine powder particles having a particle size of 0.3 mm or less tend to aggregate. Pseudo particles formed by agglomeration of fine particles of solid caking filler with a particle size of 0.3 mm or less are not easily disintegrated even when mixed with raw coal, and while mixed with raw coal It may grow and reduce the dispersibility of the solid caking filler in the raw coal. For this reason, even if, for example, a finely pulverized material containing fine particles having a particle diameter of less than 3 mm is used as the solid caking filler, the dispersibility of the solid caking filler in the raw coal is effectively improved. I couldn't. Therefore, in the prior art, the effect of improving the coke strength by finely pulverizing the solid caking filler was insufficient.

As described above, in the conventional technology, a solid caking filler containing coking charcoal containing a large amount of low-quality coking coal (non-caking coal or non-caking caking coal) and fine powder particles having a particle size of 0.3 mm or less. In some cases, coke having a sufficient strength cannot be obtained. Therefore, conventionally, when solid caking filler is pulverized and used, it is pulverized so that fine particles with a particle size of 0.3 mm or less are not generated as much as possible, or even if generated, the fine particles are not used as much as possible. It was.

In the present invention, even when a low-quality coal containing a large amount of non-caking coal or non-caking coal is used as the raw coal, a solid containing the raw coal and fine powder particles having a particle size of 0.3 mm or less is used. It aims at providing the manufacturing method of the high intensity | strength coke which can manufacture a high intensity | strength coke using caking filler.

In order to solve the above-described problems, the present inventors have studied as follows.
That is, the present inventors pay attention to the dispersibility of the pulverized caking filler in coking coal and the strength of coke, and pulverize the solid caking filler to include fine particles having a particle size of 0.3 mm or less. The pulverized caking filler is mixed with a low-quality raw coal containing non-caking coal or non-caking caking coal, and the water content of the mixture is obtained. The content of fine particles of 3 mm or less was optimized.

As a result, when the solid caking filler is pulverized into a pulverized caking filler containing fine particles having a particle size of 0.3 mm or less, and this is mixed with raw coal to obtain a mixture, the water content of the mixture and The dispersibility of the pulverized caking filler in the raw coal, in which the content of fine particles having a particle size of 0.3 mm or less that forms aggregated pseudo particles contained in the pulverized caking filler determines the coke strength. It was found to have a big effect on Moreover, it turned out that coke strength improves, so that there is much content of fine powder particle | grains with a particle size of 0.3 mm or less.

Then, by setting the content of fine powder particles having a particle diameter of 0.3 mm or less contained in the pulverized caking filler material and the water content of the mixture within a predetermined range, solid caking supplement having a particle diameter of 0.3 mm or less The particle size of the pseudo particles formed by agglomerating fine particles of the material becomes a size suitable for mixing with the raw coal, and the pulverized caking filler can be uniformly dispersed in the raw coal, and the mixture It was found that the bulk density of the coke can be improved and high strength coke can be obtained.

Specifically, when a pulverized caking filler containing fine powder particles having a particle size of 0.3 mm or less is mixed with raw coal, the water content of the mixture is 8 mass% or less. In the case where the pulverized caking filler containing fine powder particles having a particle size of 0.3 mm or less is mixed with the raw material charcoal to form a mixture, the water content of the mixture is 7 mass% or less. And found out that
The present invention has been made based on the above-described novel findings, and the gist thereof is as follows.

(1) A pulverizing step of pulverizing a solid caking filler to form a pulverizing caking filler containing fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 50% by mass or more and 100% by mass or less;
A mixing step of preparing a mixture by mixing the crushed caking filler and raw coal;
A carbonization step of carbonizing the mixture;
A drying step performed either before the mixing step, simultaneously with the mixing step, or after the mixing step and before the dry distillation step,
When the drying step is performed before the mixing step, the raw coal is dried in the drying step, and the water content of the mixture in the mixing step is 0% by mass or more and 8% by mass or less. And
When the drying step is performed simultaneously with the mixing step, in this drying step, the pulverized caking filler and the raw coal are dried while being mixed, so that the water content is 0% by mass or more and 8% by mass. Forming the mixture which is:
In the case where the drying step is performed after the mixing step and before the carbonization step, in this drying step, the mixture is dried so that the water content of the mixture is 0% by mass or more and 8% by mass or less. To produce high strength coke.

(2) A pulverization step of pulverizing the solid caking filler material to form a pulverized caking filler material containing fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 30% by mass to 100% by mass;
A mixing step of preparing a mixture by mixing the crushed caking filler and raw coal;
A carbonization step of carbonizing the mixture;
A drying step performed either before the mixing step, simultaneously with the mixing step, or after the mixing step and before the dry distillation step,
When the drying step is performed before the mixing step, the raw coal is dried in the drying step, and the water content of the mixture in the mixing step is 0% by mass or more and 7% by mass or less. And
When the drying step is performed simultaneously with the mixing step, in this drying step, the pulverized caking filler and the raw coal are dried while being mixed, and the water content is 0% by mass or more and 7% by mass or less. Forming said mixture which is
In the case where the drying step is performed after the mixing step and before the carbonization step, in this drying step, the mixture is dried so that the water content of the mixture is 0% by mass or more and 7% by mass or less. To produce high strength coke.

In addition, the fine powder particles of the solid caking filler having a particle size of 0.3 mm or less formed by crushing the solid caking filler are crushed caking filler and raw coal to the coke oven used in the transportation or dry distillation process. Generates dust when charging the mixture. The smoke generation (dust generation) phenomenon is a phenomenon in which fine particles contained in the solid caking filler material soar into the air like smoke. The dust generation of the solid caking filler material pollutes the production environment. For this reason, the present inventors paid attention to the smoke generation (dust generation) phenomenon.
In order to prevent the generation of fine powder particles from the solid caking filler material from contaminating the production environment, as a method for preventing dust generation in environmental management, the solid caking filler material after grinding or the caking caking powder can be used. A method for preventing dust generation by adding water to the mixture of the filler and raw coal is conceivable.

However, when water is added to prevent the generation of fine powder particles having a particle size of 0.3 mm or less of the solid caking filler, the fine powder particles of the solid caking filler aggregate to form pseudo particles, The effect of improving the coke strength by finely pulverizing the solid caking filler cannot be obtained sufficiently. In addition, when water is added to prevent the generation of fine particles of the solid caking filler, the bulk density of the mixture of the pulverized caking filler and the raw coal decreases, and the coke strength becomes insufficient. There is a case.

Therefore, the present inventors paid attention to the generation of fine powder particles having a particle size of 0.3 mm or less of the solid caking filler, and pulverized caking filler and raw coal obtained by crushing the solid caking filler. The mixture obtained by drying the mixture, the mixture obtained by mixing the crushed caking filler and the dried raw coal, while mixing the crushed caking filler and the raw coal The moisture content contained in the dried mixture obtained by drying was optimized.
As a result, the inventors have found that the dust content of the fine particles can be prevented by setting the water content of the mixture to 6% by mass or more.

(3) In the method for producing high-strength coke described in (1) or (2) above, moisture is added so that the water content of the mixture is 6% by mass or more after the drying step and before the carbonization step. You may further provide the moisture adjustment process to add.

(4) In the method for producing high-strength coke described in (1) or (2) above, in the pulverization step, a pulverized caking filler containing 80% by mass or more of particles having a particle size of 3 mm or less may be formed. .
(5) In the method for producing high-strength coke according to (1) or (2) above, the raw coal is 20% by mass or more and 60% by mass of one or both of non-slightly caking coal and non-caking coal. % Or less may be included.
(6) The method for producing high-strength coke according to (1) or (2), wherein, in the drying step, the mixture is heated at a temperature equal to or lower than a softening point of the solid caking filler.

According to each of the above aspects of the present invention, even when a low quality coal containing a large amount of non-caking coal or non-caking coal is used as the raw coal, the particle diameter is 0.3 mm in the raw coal. The pulverized caking filler having the following fine particles can be uniformly dispersed and the bulk density of the mixture of the pulverized caking filler and raw coal can be improved, so that high strength coke can be produced. .

It is a flowchart for demonstrating the manufacturing method of the high strength coke of 1st Embodiment and 2nd Embodiment which is an example of the manufacturing method of the high strength coke of this invention. It is a flowchart for demonstrating the manufacturing method of the high strength coke of 3rd Embodiment which is an example of the manufacturing method of the high strength coke of this invention. It is a flowchart for demonstrating the manufacturing method of the high strength coke of 4th Embodiment which is an example of the manufacturing method of the high strength coke of this invention. Examples 1-1 to 1-18, 2-1 to 2-6, Comparative Examples 1-1 to 1-5, 2-1 to 2-3, 3-1 to 3-9, 4-1 to 4- For the coke of No. 5, the relationship between the strength (DI (15)), the water content of the mixture, and the content of fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the crushed caking filler It is the shown graph. Examples 1-1 to 1-18, 2-1 to 2-6, Comparative Examples 1-1 to 1-5, 2-1 to 2-3, 3-1 to 3-9, 4-1 to 4- 5 is a graph showing the relationship between the smoke generation time of 5 and the water content of the mixture.

Each embodiment of the present invention will be described in detail.
The present inventors uniformly disperse pulverized caking filler, which is a solid caking filler containing solid powder containing fine powder (fine particles having a particle size of 0.3 mm or less) forming pseudo particles, in raw coal. If it can be mixed, it is possible to utilize fine particles having a particle size of 0.3 mm or less, which has not been utilized in the past, and based on the idea that coke strength can be further increased, a particle size of 0.3 mm We have intensively studied a method for uniformly mixing solid caking filler containing the following fine particles with raw coal.

The present inventors have intensively investigated the properties of pseudo particles formed by the fine particles of the solid caking filler. As a result, the following (x) to (z) were found.
(X) A thin film of water is formed on the surface of the fine particles of the solid caking filler. This thin film of water functions to reinforce the cohesive bond between the fine particles, and pseudo particles that do not easily collapse are formed.

(Y) The thin film of water on the surface of the fine particles of the solid caking filler disappears easily upon heating. And when the thin film of water on the surface of the fine particles disappears, the pseudo particles collapse.
(Z) Water content in solid caking filler containing fine particles forming pseudo particles and / or water content in a mixture of solid caking filler containing fine particles forming pseudo particles and raw coal By adjusting the size, the size (particle size) of the pseudo particles can be adjusted to a size (particle size) suitable for uniform mixing with the raw coal, which can prevent the generation of fine particles of the solid caking filler. be able to.

Based on the above findings (x) to (z), before mixing the solid caking filler and raw coal, mixing the solid caking filler and raw coal during the mixing of the solid caking filler and raw coal. Later, by forming pseudo particles composed of fine particles of solid caking filler of a particle size that can be uniformly mixed with the raw coal, particles that form pseudo particles in the raw coal while preventing dust generation. The solid caking filler containing fine particles having a diameter of 0.3 mm or less can be uniformly dispersed. As a result, high strength coke is obtained.

In addition, the present inventors pulverize the solid caking filler mixed with raw coal by changing the pulverization conditions with a pulverizer, and contain fine particles having a particle size of 3 mm or less contained in the solid caking filler after pulverization. The amount (% by mass) and the content (% by mass) of fine particles having a particle size of 0.3 mm or less were measured.
As a result, in the crushed solid caking filler, when the content of fine particles of 0.3 mm or less is 30% by mass or more, the content of fine particles of 3 mm or less is 80% by mass or more and 3 mm or less. The amount of change in the content of fine particles was small. In contrast, the content of fine particles of 0.3 mm or less showed a large change in content even in the region where the content of fine particles of 3 mm or less was 80% by mass or more.

From this, the present inventors determined the content (% by mass) of the fine particles of the solid caking filler having a particle size of 0.3 mm or less as the properties of the crushed solid caking filler (crushed caking filler). That is, it was adopted as an index for evaluating the ability to form pseudo particles (characteristic index of solid caking filler).

Then, the inventors pulverize the solid caking filler to obtain a crushed caking filler containing fine particles of 0.3 mm or less, and mix 2% by mass of the pulverized caking filler with the raw coal to form a mixture. The mixture is dried with a dryer to obtain a dry mixture having a water content of 7% by mass, and the dry mixture is subjected to dry distillation to produce coke, and a property index of the solid caking filler (particle size of the solid caking filler) The relationship between the content of fine particles of 0.3 mm or less) and the coke quality index was investigated. In addition, as a quality index of coke, a weight ratio (hereinafter referred to as DI (15)) of 150 mm or more by a rotation strength test drum method defined in JIS K 2151 was used.

As a result, when the pulverized caking filler contains 33.9% by mass of fine particles of 0.3 mm or less, high coke strength (DI (15)) can be secured. Further, when the content of fine particles of 0.3 mm or less contained in the pulverized caking filler was increased from 33.9% by mass to 48.3% by mass, the coke strength (DI (15)) was improved.
The improvement of coke strength (DI (15)) and other quality improvements by increasing the content of fine particles of 0.3mm or less contained in the crushed caking filler are fine under appropriate moisture content. It can be inferred that the particles formed pseudo particles having a particle size suitable for mixing with the raw coal, and the pulverized caking filler was uniformly dispersed in the raw coal.

In this embodiment, (i) a fine powder that aggregates to form pseudo particles, specifically, a particle size of 0.01 mm or more and 0 contained in a pulverized caking filler formed by pulverizing a solid caking filler. Basic technology to adjust the content of fine particles of 3 mm or less and (ii) the moisture content contained in the mixture obtained by mixing the pulverized caking filler and raw coal to the required range. It is an idea.

“First Embodiment”
FIG. 1 is a flowchart for explaining a high-strength coke manufacturing method according to the first embodiment, which is an example of the high-strength coke manufacturing method of the present invention.
As shown in FIG. 1, the manufacturing method of the high intensity | strength coke of 1st Embodiment is equipped with grinding | pulverization process S1, raw material coal grinding | pulverization process S2, mixing process S3, drying process S4, moisture adjustment process S5, and dry distillation process S6. Yes.

In the pulverization step S1, as shown in FIG. 1, the solid caking filler material x is pulverized to contain fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 50% by mass or more and 100% by mass or less. This is a process for forming a binding filler. The pulverized caking filler is a crushed caking filler x that is crushed (solid).

In the present embodiment, in order to obtain coke having sufficient strength, the fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler are 50% by mass or more. In addition, as the content of fine particles having a particle size of 0.3 mm or less contained in the pulverized caking filler is increased, the pulverized caking filler can be more uniformly dispersed in the raw coal, and the strength of the coke is increased. Can be improved.
In addition, fine particles having a particle size of 0.3 mm or less contained in the pulverized caking filler are preferable because the finer the particle size, the better the strength of the coke can be improved. The particle size is set to 0.01 mm or more so that it is possible. In addition, if the particle size of fine particles having a particle size of 0.3 mm or less contained in the pulverized caking filler is made fine, the mixture of the pulverized caking filler and raw coal to the coke oven used during transportation or in the dry distillation process In order to easily generate dust during charging, the particle size is preferably 0.1 mm or more.

Further, in the pulverization step S1, in order to more uniformly disperse the pulverized caking filler in the raw coal, it is preferable to use a pulverized caking filler containing 80% by mass or more of particles having a particle size of 3 mm or less. .
As the solid caking filler x, petroleum-based pitches or coal-based pitches that can be obtained in large quantities can be used, and those having a softening point of 180 ° C. or lower are preferably used, and those having a temperature of 140 ° C. or lower are used. Is preferred.

As shown in FIG. 1, the raw coal pulverization step S2 includes 75% by mass or more of particles having a particle size of 3 mm or less by pulverizing the raw coal y before the mixing step S3, and a particle size of 0.01 mm or more and In this step, fine powder particles of 0.3 mm or less are contained in an amount of 0% by mass or more and 30% by mass or less.
In order to disperse the pulverized caking filler more evenly in the raw coal, the fine particles of the raw coal y are preferably not more than 0.3 mm in size, and it is possible to efficiently divide the particle size using a sieve. It is preferable that the particle size be 0.01 mm or more so that it is possible. In addition, it is preferable that the fine powder particles in the above particle diameter range are contained in the raw coal y, so that the pulverized caking filler can be more uniformly dispersed in the raw coal, but it is preferably used during transportation or in the dry distillation step. Since it becomes easy to generate dust at the time of charging the mixture of the pulverized caking filler and raw coal into the coke oven, the content of fine particles in the above-mentioned grain range in the raw coal y is preferably 30% by mass or less.

Although the raw coal pulverization step S2 may not be performed, the pulverized caking filler can be more uniformly dispersed in the raw coal by performing the raw coal pulverization step S2. In the raw coal pulverization step S2, in order to more uniformly disperse the crushed caking filler in the raw coal, the raw coal y is pulverized to contain 100% by mass of particles having a particle size of 3 mm or less. It is more preferable.

Moreover, it is preferable that the raw coal y contains 20% by mass or more and 60% by mass or less of one or both of non-slightly caking coal and non-caking coal. When the content of one or both of the non-caking coal and the non-caking coal contained in the raw coal y is 20% by mass or more, the usage amount of the strong caking coal used for the raw coal y is reduced. A sufficient effect is obtained.
Further, when the content of one or both of the non-slightly caking coal and the non-caking coal contained in the raw coal y exceeds 60% by mass, even if a caking filler is added (DI (15) ) It becomes difficult to ensure the strength of coke of 85 or more.

The mixing step S3 was pulverized in the pulverized caking filler and raw material coal pulverizing step S2, which is a solid caking filler as a solid containing fine powder particles having a particle size of 0.3 mm or less that aggregate to form pseudo particles. This is a step of mixing raw coal with a mixture.
The mixing ratio of the pulverized caking filler and the raw coal is not particularly limited, but the raw coal y containing 20% by mass or more and 60% by mass or less of one or both of non-slightly caking coal and non-caking coal is included. When used, (DI (15)) in order to ensure a coke strength of 85 or more, the range of 0.5% by mass: 100% by mass (crushed caking filler: raw coal) to 5% by mass: 100% by mass It is preferable that

The drying step S4 is a step of drying the mixture using a dryer or the like to obtain a dry mixture having a water content of 0% by mass to 8% by mass.
When the moisture content of the dry mixture is excessive, the pseudo particles formed by agglomeration of fine particles having a particle size of 0.3 mm or less contained in the solid caking filler material are suitable for uniform mixing with the raw coal. It grows beyond the thickness (particle size), leading to coarsening of the pseudo particles and inconsistent sizes (particle sizes) of the pseudo particles. For this reason, it becomes difficult for the solid caking filler to be uniformly dispersed in the raw coal, and the strength of the coke is lowered or the variation in the strength of the coke is increased.

The moisture content of the dry mixture necessary to form pseudo particles of solid caking filler of a size (particle size) suitable for uniform mixing with raw coal is the type of solid caking filler and the property index It depends on the content of fine particles of 0.3 mm or less contained in the pulverized caking filler obtained by crushing the solid caking filler.

When the moisture content of the dry mixture exceeds 8% by mass, pseudo particles having a particle size suitable for mixing with the raw coal are not formed, and it becomes difficult to uniformly disperse the crushed caking filler in the raw coal, Coke strength is insufficient. The moisture content of the dry mixture is preferably small and more preferably 7% by mass or less in order to disperse the pulverized caking filler further uniformly in the raw coal.

The moisture content of the dry mixture may be 0% by mass, but the time required for drying the mixture can be shortened, the drying step S4 can be performed efficiently, and at the time of transportation. Or it is preferable that it is 6 mass% or more so that the dust generation which generate | occur | produces when charging a dry mixture into a coke oven can be prevented. In addition, when the moisture content of the dry mixture is 6% by mass or more, moisture adjustment is performed so that the moisture content of the dry mixture becomes 6% by mass or more after the drying step S4 and before the dry distillation step S6. Even without performing step S5, dust generation can be sufficiently prevented. For this reason, compared with the case where moisture adjustment process S5 is performed, coke can be manufactured efficiently.

In drying process S4, it is preferable to heat a mixture at the temperature below the softening point of a solid caking filler. This makes it possible to efficiently obtain a dry mixture by heating the mixture at a temperature at which the solid caking filler does not liquefy or melt. Specifically, the temperature at which the mixture is heated in the drying step S4 is more preferably 100 ° C. or lower. Moreover, in order to dry a mixture efficiently, it is preferable that the temperature which heats a mixture in drying process S4 is 50 degreeC or more.

The moisture adjustment step S5 is a step of adding moisture so that the moisture content of the dry mixture is 6% by mass or more after the drying step S4 and before the carbonization step S6. By performing moisture adjustment process S5, it can prevent that the fine powder particle | grains with a particle size of 0.3 mm or less contained in the grinding | pulverization caking filler of a dry mixture generate dust. The moisture adjustment step S5 may not be performed when the moisture content of the dry mixture after the drying step S4 is 6% by mass or more, or when it is not necessary to prevent dust generation.

When the moisture content of the dry mixture is 6% by mass or more, the pseudo particles formed by agglomeration of fine particles having a particle size of 0.3 mm or less contained in the solid caking filler do not collapse and do not generate dust. However, if the moisture content of the dry mixture is less than 6% by mass, the pseudo-particles of the solid caking filler material collapse and a large amount of fine particles are generated, resulting in a smoke generation (dust generation) phenomenon. Therefore, the moisture content of the dry mixture necessary to prevent dust generation of the solid caking filler fine particles by forming pseudo particles in which the solid caking filler fine powder particles do not collapse is 6% by mass or more. It is estimated to be.

When the pseudo-particles of the solid caking filler collapse and a large amount of fine particles are generated and smoke is generated, the solid caking filler in the dry mixture is lost and the working environment is contaminated. Therefore, from the viewpoint of suppressing smoke generation (dust generation) phenomenon when a dry mixture obtained by mixing solid caking filler and raw coal is charged into a coke oven, the moisture adjustment step S5 is performed, The water content is preferably 6% by mass or more. By setting the moisture content of the dry mixture to 6% by mass or more, the smoke generation time when charging the dry mixture into the coke oven is set to 16 seconds or less, which is the standard value in the US Air Act (Clean Air Act). Can do.

In addition, as shown below, the fine particle of 0.3 mm or less contained in a solid caking filler can be handled as a fine particle which forms a pseudo particle. The reason for this will be described with reference to Table 1.
Table 1 shows the result of measuring the particle size distribution of the dust collection dust of charging coal (mixture of solid caking filler and raw coal) having a water content of 5.3 mass%.

The charged coal shown in Table 1 has a moisture content (humidity controlled moisture) of 6% by mass or less, and therefore smoke is generated when charged into a coke oven. Moreover, it is thought that the dust collection dust of the charging coal shown in Table 1 was generated by the collapse of the pseudo particles made of the fine particles of the solid caking filler. As shown in Table 1, the particle size of the dust collection dust is 300 μm or less (= 0.3 mm [the particle size in the leftmost column in Table 1]). From this, it is inferred that fine particles having a particle size of 0.3 mm or less form pseudo particles. Therefore, fine particles having a particle size of 0.3 mm or less contained in the solid caking filler can be handled as fine particles forming pseudo particles.

The dry distillation step S6 is a step of dry distillation of the dry mixture. The dry distillation of the dry mixture can be performed using a coke oven. As shown in FIG. 1, coke z is obtained by performing dry distillation process S6.

The method for producing high-strength coke according to the present embodiment is obtained by crushing solid caking filler and containing fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 50% by mass or more and 100% by mass or less. A pulverization step S1 as a filling material, a mixing step S3 for mixing a pulverized caking filler material and raw coal, and a dry distillation step S6 for dry distillation of the mixture, and after the mixing step S3 and a dry distillation step Before S6 (between the mixing step S3 and the carbonization step S6), the method includes a drying step S4 in which the mixture is dried so that the water content of the mixture is 0% by mass or more and 8% by mass or less. Therefore, even when a low quality coal containing a large amount of non-caking coal or non-caking coal is used as the raw coal, a pulverized viscosity having fine powder particles having a particle size of 0.3 mm or less in the raw coal. Since the binding filler can be uniformly dispersed and the bulk density of the mixture of the crushed caking filler and raw coal can be improved, high-strength coke z can be produced.

Moreover, the manufacturing method of the high intensity | strength coke of this embodiment is equipped with the water | moisture-content adjustment process S5 which adds a water | moisture content so that the water content of a dry mixture may be 6 mass% or more after drying process S4 and before carbonization process S6. Therefore, using the raw coal and the pulverized caking filler containing fine powder particles having a particle size of 0.3 mm or less, while preventing dust generation of the pulverized caking filler, high strength coke z Can be manufactured.

“Second Embodiment”
In the first embodiment described above, a pulverized caking filler containing fine powder particles having a particle size of 0.01 mm or more and 0.3 mm or less and 50 mass% or more and 100 mass% or less is mixed with raw coal to form a mixture, Although the case where the water content of the mixture is 0% by mass or more and 8% by mass or less has been described as an example, in this embodiment, 30% by mass of fine powder particles having a particle size of 0.01 mm or more and 0.3 mm or less are used. The case where the pulverized caking filler containing not less than 100% and not more than 100% by mass is mixed with raw coal to make a mixture, and the moisture content of the mixture is not less than 0% by mass and not more than 7% by mass will be described.

In the method for producing high-strength coke according to the present embodiment, the content of the fine powder particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler and the water content of the mixture is the first. The same method as the embodiment can be used.

The method for producing high-strength coke according to the present embodiment is obtained by crushing solid caking filler and containing fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 30% by mass or more and 100% by mass or less. It comprises a pulverization step for making a filling material, a mixing step for mixing the pulverized caking filler material and raw coal, and a dry distillation step for dry distillation of the mixture. After the mixing step and before the dry distillation step (mixing) Between the step and the carbonization step), the method includes a drying step in which the mixture is dried so that the water content of the mixture is 0% by mass or more and 7% by mass or less.

In the present embodiment, the fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler are 30% by mass or more in order to obtain coke having sufficient strength, In order to further improve the strength of the coke, it is preferably 40% by mass or more, and more preferably 50% by mass or more.

In the present embodiment, the content of fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler is 30% by mass or more and 100% by mass or less. If the water content exceeds 7% by mass, pseudo particles having a particle size suitable for mixing with the raw coal are not formed, and it becomes difficult to uniformly disperse the crushed caking filler in the raw coal, and the strength of the coke. May become insufficient.

The moisture content of the dry mixture is preferably small in order to more uniformly disperse the pulverized caking filler in the raw coal, and more preferably 6.5% by mass or less.
The moisture content of the dry mixture may be 0% by mass, but the time required for drying the mixture can be shortened, the drying process can be performed efficiently, The amount is preferably 6% by mass or more so as to prevent dust generation when the dry mixture is charged into the coke oven. In addition, when the moisture content of the dry mixture is 6% by mass or more, a moisture adjustment step of adding moisture so that the moisture content of the dry mixture becomes 6% by mass or more after the drying step and before the dry distillation step. Even if not performed, dust generation can be sufficiently prevented. For this reason, compared with the case where a moisture adjustment process is performed, coke can be manufactured efficiently.

In this embodiment, the content of fine powder particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler is 30% by mass or more and 100% by mass or less, but the mixture is dried. By using a dry mixture having a moisture content of 0% by mass or more and 7% by mass or less, the pulverized caking filler containing fine powder particles having a particle size of 0.3 mm or less can be uniformly dispersed in the raw coal. .

Therefore, also in the manufacturing method of the high intensity | strength coke of this embodiment, the low quality thing which mix | blended many non-caking coal and non-caking coal was used as raw coal similarly to 1st Embodiment mentioned above. Even in this case, the pulverized caking filler having fine particles having a particle size of 0.3 mm or less can be uniformly dispersed in the raw coal, and the bulk density of the mixture of the pulverized caking filler and raw coal Therefore, high strength coke can be produced.

“Third Embodiment”
FIG. 2 is a flowchart for explaining the method for producing high-strength coke according to the third embodiment, which is an example of the method for producing high-strength coke according to the present invention. In 1st Embodiment and 2nd Embodiment mentioned above, although drying process S4 was performed after mixing process S3 and before dry distillation process S6, as shown in FIG. 2, the high intensity | strength coke of 3rd Embodiment is carried out. In the manufacturing method, the drying step S41 is performed before the mixing step S31.

In the manufacturing method of the high intensity | strength coke of this embodiment, it can be set as the same method as 1st Embodiment or 2nd Embodiment except performing drying process S41 before mixing process S31.
That is, as shown in FIG. 2, the method for producing high-strength coke according to the present embodiment pulverizes the solid caking filler material to produce fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 50% by mass or more. A pulverizing and caking additive containing 100% by mass or less (or 30% by mass and 100% by mass or less), a raw coal pulverizing step S2, and a pulverizing caking additive and raw coal are mixed. It is provided with a mixing step S31 to be a mixture, a moisture adjusting step S5, and a carbonization step S6 for carbonizing the mixture. Before the mixing step S31, the raw coal is dried, and the water content of the mixture in the mixing step is 0 mass. % Or more and 8% by mass or less (when fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler are 30% by mass or more and 100% by mass or less, 0% by mass or more And 7 mass% or less A method of performing a drying step S41 to make a.

In the drying step S41 of the present embodiment, the raw coal pulverized using a dryer or the like is dried, and the water content of the mixture in the mixing step S31 is 0% by mass or more and 8% by mass or less (crushed caking filler) In the case where the fine particles having a particle diameter of 0.01 mm or more and 0.3 mm or less are contained in 30% by mass or more and 100% by mass or less, 0% by mass to 7% by mass) is there.
In the drying step S41, a target value in the range of the moisture content of the raw coal after the drying step S41 is calculated in advance, and the raw coal is dried so as to be the target value. The target value of the moisture content of the raw coal after the drying step S41 can be calculated as follows. That is, using the moisture content of the crushed caking filler and the content of the crushed caking filler contained in the mixture, the moisture content of the raw coal in which the moisture content of the mixture in the mixing step is within the above range. Determine the range of quantities.

The moisture content of the raw coal after the drying step S41 may be 0% by mass, but the time required for drying the raw coal can be shortened, and the drying step S41 can be efficiently performed. It is preferable that the water content of the mixture is 6% by mass or more so that the generation of dust during transportation or charging of the dry mixture into the coke oven can be prevented. .
In addition, when the moisture content of the dry mixture obtained by mixing the pulverized caking filler and the raw coal after the drying step S41 is 6% by mass or more, after the drying step S41 and the dry distillation step S6 Dust generation can be sufficiently prevented without performing the moisture adjustment step S5 in which moisture is added so that the moisture content of the dry mixture becomes 6% by mass or more before. For this reason, compared with the case where moisture adjustment process S5 is performed, coke can be manufactured efficiently.

In the drying step S41, it is preferable to heat the raw coal. As a result, the raw coal can be efficiently dried. The temperature at which the raw coal is heated is not particularly limited, but in the mixing step S31 performed after the drying step S41, the solid caking filler in contact with the raw coal is prevented from being liquefied and melted. The temperature is preferably below the softening point of the caking filler.

The mixing step S31 is pulverized in the pulverized caking filler and raw material coal pulverizing step S2, which is a solid caking filler as a solid containing fine particles having a particle size of 0.3 mm or less that aggregate to form pseudo particles, This is a step of mixing the raw coal dried in the drying step S41 to form a mixture.

In the method for producing high-strength coke according to the present embodiment, the content of fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler in the pulverization step S1 is 50% by mass or more and 100% by mass. % Or less (or 30% by mass or more and 100% by mass or less), and in the drying step S41, the water content of the mixture in the mixing step S31 is 0% by mass or more and 8% by mass or less (particles included in the crushed caking filler) When the fine particles having a diameter of 0.01 mm or more and 0.3 mm or less are 30% by mass or more and 100% by mass or less, they are set to 0% by mass or more and 7% by mass or less. For this reason, as in the first embodiment and the second embodiment described above, even as a raw material coal, even when a low-quality coal containing a large amount of non-caking coal or non-caking coal is used, the raw material While being able to uniformly disperse the pulverized caking filler having fine particles having a particle size of 0.3 mm or less in the charcoal, it is possible to improve the bulk density of the mixture of the pulverized caking filler and raw coal, High strength coke can be produced.

“Fourth Embodiment”
FIG. 3 is a flowchart for explaining a high-strength coke manufacturing method according to the fourth embodiment, which is an example of the high-strength coke manufacturing method of the present invention. In 1st Embodiment and 2nd Embodiment mentioned above, although drying process S4 was performed after mixing process S3 and before dry distillation process S6, as shown in FIG. 3, the high intensity | strength coke of 3rd Embodiment is carried out. In this manufacturing method, the drying step is performed simultaneously with the mixing step S32.

In the manufacturing method of the high intensity | strength coke of this embodiment, it can be set as the same method as 1st Embodiment or 2nd Embodiment except performing a drying process simultaneously with mixing process S32.
That is, as shown in FIG. 3, the method for producing high-strength coke according to the present embodiment pulverizes the solid caking filler, and fine particles having a particle size of 0.01 mm or more and 0.3 mm or less are contained in an amount of 50% by mass or more. A pulverizing and caking additive containing 100% by mass or less (or 30% by mass and 100% by mass or less), a raw coal pulverizing step S2, and a pulverizing caking additive and raw coal are mixed. It comprises a mixing step S32 to be a mixture, a moisture adjustment step S5, and a carbonization step S6 for carbonizing the mixture. Simultaneously with the mixing step S32, the mixture is dried while mixing the pulverized caking filler and raw coal, and contains moisture. The amount is 0% by mass or more and 8% by mass or less (when fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler are 30% by mass or more and 100% by mass or less, 0 mass% or more and 7 quality % Or less) is a method of performing a drying step to form a mixture which is. Therefore, in this embodiment, the mixing step S32 also serves as a drying step.

The drying step (mixing step S32) of the present embodiment is dried using a dryer or the like while mixing the pulverized caking filler and raw coal, and has a water content of 0% by mass or more and 8% by mass or less ( When the fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler are 30% by mass or more and 100% by mass or less, 0% by mass or more and 7% by mass or less) It is a process of forming a mixture.

In the method for producing high-strength coke according to the present embodiment, the content of fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler in the pulverization step S1 is 50% by mass or more and 100% by mass. % Or less (or 30% by mass or more and 100% by mass or less), and in the drying step (mixing step S32), the pulverized caking filler and the raw coal are dried while mixing, and the water content is 0% by mass or more. And 8% by mass or less (when fine particles having a particle size of 0.01 mm or more and 0.3 mm or less contained in the pulverized caking filler are 30% by mass or more and 100% by mass or less, 0% by mass or more and 7% by mass or less. A mass% or less) is formed. For this reason, as in the first embodiment and the second embodiment described above, even as a raw material coal, even when a low-quality coal containing a large amount of non-caking coal or non-caking coal is used, the raw material While being able to uniformly disperse the pulverized caking filler having fine particles having a particle size of 0.3 mm or less in the charcoal, it is possible to improve the bulk density of the mixture of the pulverized caking filler and raw coal, High strength coke can be produced.

Next, examples of the present invention will be described. The conditions of the examples are one example of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is limited to this one example of conditions. Is not to be done. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

(Example)
The total solid content (TS) shown in Table 2 and the petroleum-based solid caking fillers having the softening points shown in Tables 3 to 7 were pulverized, and the particle sizes of 0.01 mm or more shown in Tables 3 to 7 were obtained. A crushed caking filler material having a content of fine particles of 0.3 mm or less and a particle size of 3 mm or less was obtained (pulverization step).
In addition, raw coals having blending ratios shown in Tables 3 to 7 were prepared as raw coals. Among the raw coals shown in Tables 3 to 7, some raw coals are pulverized to a ratio of particles having a particle size of 3 mm or less shown in Tables 3 to 7, and a particle size of 0.01 mm or more and 0.3 mm. The ratio of the following fine powder particles was used (raw coal pulverization step).

Next, the raw coals of Examples 5-1 to 5-5 and Comparative Examples 5-1 to 5-5 were placed in a dryer and dried (drying step). Thereafter, the dried raw coal and the pulverized caking filler shown in Table 5 were mixed at a ratio shown in Table 5 to obtain a mixture having a moisture content shown in Table 5 (mixing step).
Thereafter, water was added to the mixtures of Examples 5-1 to 5-5 and Comparative Examples 5-1 to 5-5 (moisture adjustment step) to obtain a mixture having a water content shown in Table 5. Thereafter, the mixture thus obtained was subjected to dry distillation in a coke oven to obtain cokes of Examples 5-1 to 5-5 and Comparative Examples 5-1 to 5-5 (dry distillation step).

Further, coking coals of Examples 6-1 to 6-5, Examples 7-1 to 7-5, Comparative Examples 6-1 to 6-5, and Comparative Examples 7-1 to 7-5 and Tables 6 and 7 were used. The crushed caking filler material shown in Table 6 and Table 7 was put into a dryer at a ratio shown in Table 6 and Table 7 and dried while mixing to obtain a mixture of water contents shown in Table 6 and Table 7 (mixing step and drying step). .
Thereafter, water was added only to the mixtures of Examples 6-1 to 6-5 and Comparative Examples 6-1 to 6-5 (moisture adjustment step) to obtain a mixture having a water content shown in Table 6. Thereafter, the mixture thus obtained was subjected to dry distillation in a coke oven, and Examples 6-1 to 6-5, Examples 7-1 to 7-5, Comparative Examples 6-1 to 6-5, and Comparative Example 7 were used. Coke of -1 to 7-5 was obtained (dry distillation process).

Further, the raw coals of Examples 1-1 to 1-18, 2-1 to 2-6, Comparative Examples 1-1 to 1-5, 2-1 to 2-3, and 3-1 to 3-9 are listed. 3 and Table 4 were mixed at a ratio shown in Table 3 and Table 4 to obtain a mixture (mixing step). Subsequently, the mixture was put into a drier and dried to obtain a mixture having a moisture content shown in Tables 3 and 4 (drying step).
Thereafter, the water in the mixture of Examples 1-1 to 1-18, 2-1 to 2-6, Comparative Examples 1-1 to 1-5, 2-1 to 2-3, and 3-1 to 3-9 was removed. It was added (moisture adjustment step) to obtain a mixture of water contents shown in Tables 3 and 4. Thereafter, the mixture thus obtained was subjected to dry distillation in a coke oven, and Examples 1-1 to 1-18, 2-1 to 2-6, Comparative Examples 1-1 to 1-5, and 2-1 to 2 were used. -3, 3-1 to 3-9 coke (dry distillation process).

Further, the raw coals of Comparative Examples 4-1 to 4-5 and the pulverized caking filler shown in Table 4 were mixed at a ratio shown in Table 4 to obtain a mixture having a moisture content shown in Table 4.
Thereafter, the obtained mixture was subjected to dry distillation in a coke oven to obtain cokes of Comparative Examples 4-1 to 4-5.

The coke strengths of all examples and all comparative examples thus obtained were measured. In addition, DI (15) was measured as an index of coke strength. The measurement results are shown in Tables 3 to 6 and FIG.
As shown in Tables 3 to 6, in all Examples, the strength of coke is remarkably improved as compared with all Comparative Examples.

FIG. 4 shows Examples 1-1 to 1-18, 2-1 to 2-6, Comparative Examples 1-1 to 1-5, 2-1 to 2-3, 3-1 to 3-9, 4- For coke of 1 to 4-5, strength (DI (15)), water content of the mixture, and content of fine powder particles having a particle size of 0.01 mm to 0.3 mm contained in the pulverized caking filler It is the graph which showed the relationship.
As shown in FIG. 4, when a pulverized caking filler containing 50% by mass or more of fine particles having a particle size of 0.01 mm or more and 0.3 mm or less is mixed with raw coal to form a mixture, the water content of the mixture When the content is 8% by mass or less and the pulverized caking filler containing 30% by mass or more of fine powder particles having a particle size of 0.01 mm or more and 0.3 mm or less is mixed with raw coal to form a mixture, It was confirmed that the coke strength of DI (15)) 85 or more could be ensured if the water content of was less than 7% by mass.

Moreover, in order to obtain the coke of all the examples and all the comparative examples, the smoke generation time, which is the time during which the smoke generated when the mixture is charged into the coke oven, continues. The measurement results are shown in Tables 3 to 6 and FIG.
As shown in Tables 3 to 6, the smoke generation time of all the examples was 16 seconds or less. On the other hand, in Comparative Examples 3-1 to 3-9, the smoke generation time exceeded 16 seconds.

FIG. 5 shows Examples 1-1 to 1-18, 2-1 to 2-6, Comparative Examples 1-1 to 1-5, 2-1 to 2-3, 3-1 to 3-9, 4- 6 is a graph showing the relationship between the smoke generation time of 1 to 4-5 and the water content of the mixture. In FIG. 5, the dotted line in the horizontal direction indicates the position where the smoke generation time is 16 seconds, and the dotted line in the vertical direction indicates the position where the moisture content is 6%.
As shown in FIG. 5, the smoke generation phenomenon lasts for a longer time as the moisture content of the mixture is smaller, and becomes shorter as the moisture content of the mixture is larger. Specifically, when the water content of the mixture was 6% by mass or more, it was confirmed that the smoke generation time was 16 seconds or less. Moreover, when the moisture content in charging coal becomes less than 6 mass%, it turns out that smoke generation time may increase remarkably.

As described above, according to the present invention, even if the use ratio of low-quality raw coal (non-caking coal or non-caking coal) is increased, coke having higher strength than conventional can be produced at low cost. Can do. Therefore, the present invention has high applicability in the coke manufacturing industry.

S1 pulverization process S2 raw coal pulverization process S3, S31, S32 mixing process S4, S41 drying process S5 moisture adjustment process S6 dry distillation process "transfer confirmation certificate"
x Coking coal y Solid caking filler z Coke

Claims (6)

1. A pulverization step of pulverizing the solid caking filler material to form a pulverized caking filler material containing fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 50% by mass or more and 100% by mass or less;
   A mixing step of preparing a mixture by mixing the crushed caking filler and raw coal;
   A carbonization step of carbonizing the mixture;
   A drying step performed either before the mixing step, simultaneously with the mixing step, or after the mixing step and before the dry distillation step,
   When the drying step is performed before the mixing step, the raw coal is dried in the drying step, and the water content of the mixture in the mixing step is 0% by mass or more and 8% by mass or less. And
   When the drying step is performed simultaneously with the mixing step, in this drying step, the pulverized caking filler and the raw coal are dried while being mixed, so that the water content is 0% by mass or more and 8% by mass. Forming the mixture which is:
   In the case where the drying step is performed after the mixing step and before the carbonization step, in this drying step, the mixture is dried so that the water content of the mixture is 0% by mass or more and 8% by mass or less. A method for producing high-strength coke, characterized by:
2. A pulverization step of pulverizing the solid caking filler material to form a pulverized caking filler material containing fine particles having a particle size of 0.01 mm or more and 0.3 mm or less in an amount of 30% by mass or more and 100% by mass or less;
   A mixing step of preparing a mixture by mixing the crushed caking filler and raw coal;
   A carbonization step of carbonizing the mixture;
   A drying step performed either before the mixing step, simultaneously with the mixing step, or after the mixing step and before the dry distillation step,
   When the drying step is performed before the mixing step, the raw coal is dried in the drying step, and the water content of the mixture in the mixing step is 0% by mass or more and 7% by mass or less. And
   When the drying step is performed simultaneously with the mixing step, in this drying step, the pulverized caking filler and the raw coal are dried while being mixed, and the water content is 0% by mass or more and 7% by mass or less. Forming said mixture which is
   In the case where the drying step is performed after the mixing step and before the carbonization step, in this drying step, the mixture is dried so that the water content of the mixture is 0% by mass or more and 7% by mass or less. A method for producing high-strength coke, characterized by:
3. 3. The method according to claim 1, further comprising a moisture adjustment step of adding moisture so that a moisture content of the mixture becomes 6% by mass or more after the drying step and before the carbonization step. A method for producing high-strength coke.
4. The method for producing high-strength coke according to claim 1 or 2, wherein in the pulverizing step, a pulverized caking filler material containing 80% by mass or more of particles having a particle size of 3 mm or less is formed.
5. The production of high-strength coke according to claim 1 or 2, wherein the raw coal includes 20% by mass or more and 60% by mass or less of one or both of non-slightly caking coal and non-caking coal. Method.
6. The method for producing high-strength coke according to claim 1 or 2, wherein in the drying step, the mixture is heated at a temperature equal to or lower than a softening point of the solid caking filler.

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