JPH09241655A - Previous treatment of coke raw material coal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for carrying out previous treatment of coke raw material coal, excellent in workability, productivity, mass production and reliability, capable of preventing occurrence of dust when coke raw material coal is charged into a coke oven or carried, preventing deterioration of quality of by-products such as tar and ammonia produced in a coke oven and further preventing trouble such as defect of rotation of a conveyer by suitably controlling addition amount of a binder. SOLUTION: This method for carrying out previous treatment comprises a drying step for drying water content in coke raw material coal charged into a coke oven 15 to 2-6% water content and classifying step for classifying the coke raw material coal treated by the drying step into a crude particle group containing >=95wt.% crude particles having >=100μm particle size and >=80wt.% crude particles having >=300μm particle size and a fine particle group other than the crude particle group. The crude particle group treated in the classifying step is charged into the coke oven 15 to prevent occurrence of dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretreatment method for coke coking coal which prevents dust generation when charging coke coking coal into a coke oven.

[0002]

2. Description of the Related Art Conventionally, when coke raw coal is charged into a coke oven, dust flies (hereinafter referred to as dust),
In addition to deteriorating the working environment, it is said that by-products such as tar and ammonia produced in the coke oven are mixed with dust to increase the solid content and ash content in the by-products and deteriorate the quality of by-products. There was a problem. Therefore, in order to solve this problem, Japanese Patent Laid-Open No. 62-192486 discloses that in the production of dry and preheated coal charged into a coke oven, a pseudo particle portion of coal having a size that causes dust is generated. A method for producing dry and preheated coal is proposed in which the particulate matter is completely destroyed in the drying, preheating and subsequent steps, and is completely separated from the particle portion of the coal that does not generate dust (hereinafter referred to as the coarse particle portion). There is. In the method for producing dried and preheated coal, after separating the fine particle portion of coal having a size of 100 μm or less, which causes dust generation, and completely separating the pseudo-particulate material in the fine particle portion, A binder such as heavy oil is added to the completely separated fine particle portion to roll or press to form a pseudo particle product having a size of 100 μm or more, which is mixed with a coarse particle portion of coal of a size that does not generate dust, and a coke oven Is charged to.

[0003]

However, in the above-described method for producing dried and preheated coal, the particle size of 10 which produces the dry coal is generated.
There is a problem that it is extremely difficult to completely separate fine particles having a particle size of 0 μm or less and coarse particles having a particle size of 100 μm or more that do not generate dust, even with the current technology. Even if coarse particles having a particle size of 100 μm or more can be separated from dry coal, for example, if only particles having a particle size of around 100 μm are collected, there is a problem that dust is generated. Furthermore, not only lumpy and powdery coal is used as a raw material for dry coal, but the viscosity etc. differ depending on the type of coal. A little difference occurs, and as a result, for example, the particle size is 100μ.
Even if an attempt is made to add a binder to a fine particle portion of m or less to form a pseudo-particle product, the amount of the binder is too small to generate dust, or the amount of the binder is too large to form a mixture of a coarse particle portion and a pseudo-particle portion. However, there is a problem that the binder adheres to a conveyer that conveys the mixture, a relay hopper for charging the mixture into the carbonization chamber of the coke oven, and the like, which causes troubles such as defective rotation of the conveyer.

The present invention has been made in view of such circumstances, and it is possible to prevent dust generation when charging or transporting coke raw coal into the coke oven, and at the same time, to generate the coke oven in the coke oven. It is possible to prevent the deterioration of quality of by-products such as tar and ammonia, and to control troubles such as defective rotation of the conveyor by properly controlling the addition amount of the binder, and workability and productivity, Mass productivity,
It is an object to provide a highly reliable pretreatment method for coking coking coal.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
The method for pretreatment of the coke raw coal described above comprises a drying step of drying the moisture in the coke raw coal charged into the coke oven to 2 to 6 wt% and a coke raw coal treated in the drying step with a particle size of 100 μm or more. Coarse particles containing 95 wt% or more of coarse particles of 80 μm or more and coarse particles having a particle size of 300 μm or more, and a classification step of classifying into other fine particle groups, and the coarse particles treated in the classification step The dust is prevented by charging the group into the coke oven. The pretreatment method for a coke raw coal according to claim 2 is the pretreatment method for a coke raw coal according to claim 1, wherein the coke raw coal is classified by an air classifier in the classifying step and treated in the classifying step. The amount of air supplied to the air classifier is controlled according to the measured particle size of the coarse particle group.

The method for pretreatment of coke raw coal according to claim 3 is a drying step of drying the moisture in the coke raw coal charged into the coke oven to 2 to 6 wt%, and a coke raw material treated in the drying step. A classification step of classifying charcoal into a coarse particle group containing 95 wt% or more of coarse particles having a particle size of 100 μm or more and 80 wt% or more of coarse particles having a particle size of 300 μm or more, and a fine particle group other than that, and a treatment in the classification step A binder is added to the fine particle group and kneaded to obtain a particle size of 10
A granulation step of granulating a pseudo particle group containing 90 wt% or more of pseudo particles of 0 μm or more, and a coarse particle group processed in the classification step and a pseudo particle group processed in the granulation step. Dust is prevented by charging the mixture into the coke oven. Note that, as in the above case, the coarse particle group treated in the classification step may be separately charged into the coke oven.

The pretreatment method for the coke raw coal according to claim 4 is a drying step of drying the moisture in the coke raw coal charged into the coke oven to 2 to 6 wt%, and a coke raw material treated in the drying step. A classification step of classifying the charcoal into coarse particle groups containing 95 wt% or more of coarse particles having a particle size of 100 μm or more and 80 wt% or more of coarse particles having a particle size of 300 μm or more, and other fine particle groups; A binder is added to the fine particle group and kneaded to obtain a particle size of 10
90% by weight or more of pseudo particles of 0 μm or more and a particle size of 30
A granulation step of granulating a pseudo particle group containing 75 wt% or more of pseudo particles of 0 μm or more, and a coarse particle group treated in the classification step, or a coarse particle group and a coarse particle treated in the classification step. A dust is prevented by charging the mixture with the particle group into the coke oven. Note that, as in the above case, the coarse particle group treated in the classification step may be separately charged into the coke oven.

The pretreatment method for coke raw coal according to claim 5 is the pretreatment method for coke raw coal according to claim 3 or 4, wherein the coke raw coal is classified by a wind classifier in the classifying step, and In the granulating step, the fine particle group and the binder are kneaded by a kneader to granulate, and the air is classified into the wind classifier according to the particle size measurement value of the coarse particle group processed in the classifying step. The amount of air supply is controlled, and the amount of binder supplied to the kneading machine is controlled according to the particle size measurement value of the pseudo particle group processed in the granulation step. Incidentally, in some cases, in the same manner as described above, while classifying the coke raw coal in the classifying step with a wind classifier, the wind classifier according to the particle size measurement value of the coarse particle group processed in the classifying step. Control the amount of air supplied or granulate by kneading the fine particle group and the binder in a kneading machine in the granulating step, and measuring the particle size of the pseudo particle group processed in the granulating step. Only the amount of binder supplied to the kneader may be controlled according to the value.

Here, the coke raw coal is an ordinary powdery coking coal (hereinafter referred to as pulverized coal) charged into a coke oven.
In addition to such raw coals, pulverized coals including molded coals, granulated coals, and caking fillers are also included. In addition, low-grade coal such as sub-bituminous coal and brown coal may be used. As a dryer for drying the coke raw coal in the drying step, it is conventionally known as long as it does not generate a large amount of dust by violently impacting the coke raw coal or violently colliding the particles of the coke raw coal. Those can be used as appropriate. Specifically, in a drum-type dryer or the like, in which the coke raw coal is continuously dried by exchanging heat with a heat medium circulating outside the drum while the coke raw coal slowly passes through the rotating horizontal drum. is there.

In the drying step, the water content of the coke raw coal is 2
It is desirable to dry to ˜6 wt%, preferably 4 to 6 wt%. This is to improve the quality of coke raw coal by drying the coke raw coal, to prevent energy loss during dry distillation in the coke oven or during classification in the classification process, and to improve dry distillation efficiency and classification efficiency. It is an objective, and it is better that the amount of water in the coke raw coal is smaller, but it is necessary to lengthen the drying time to reduce the water content of the coke raw coal to less than 4 wt%. When the water content of the coke raw coal is less than 2 wt%, this tendency becomes remarkable, and the coke raw coal becomes too dry, and fine particles may be adsorbed on the surface of the coarse particles. This is because it tends to generate dust without being able to do so. On the other hand, the water content of coking coal is 6w
If t% is exceeded, it is impossible to prevent the above-mentioned energy loss and the improvement of dry distillation efficiency and classification efficiency.

Any classifier may be used as a classifier for classifying the coke raw coal into a coarse particle group and a fine particle group in the classification step, but fine particles of 100 μm or less can be efficiently classified. At the same time, a wind power classifier that can prevent problems such as clogging as much as possible is desirable. The wind classifier is preferably connected directly to the outlet of the dryer or connected by means such as a duct in order to prevent dust from scattering. When classifying into coarse particle groups and fine particle groups in the classification step, it is desirable to increase the amount of coarse particle groups and decrease the amount of fine particle groups as much as possible. this is,
A large dust collector and a kneading machine are required as the number of fine particles increases, and a large amount of binder such as tar or tar slag or a mixture thereof is also required, but this is prevented and the processing cost is low. Because you can do it.

The coarse particle group preferably contains 95 wt% or more of coarse particles having a particle size of 100 μm or more and 80 wt% or more of coarse particles having a particle size of 300 μm or more. This is because when the number of coarse particles having a particle size of 100 μm or more in the coarse particle group is less than 95 wt%, the amount of fine particles having a particle size of 100 μm or less increases too much, and the fine particles cannot be adsorbed on the surface of the coarse particles. Dust becomes easy (in other words, since coarse particles and fine particles are in a wet state containing 2 to 6 wt% of water,
Fine particles are adsorbed on the surface of coarse particles, but when the amount of fine particles exceeds the amount of fine particles that can be adsorbed on the total surface area of all coarse particles, fine particles that cannot be adsorbed on the coarse particles generate dust: Fig. 1
(See (b)), when the coarse particles having a particle size of 300 μm or more in the coarse particle group are less than 80 wt%, for example, when the coke raw coal is conveyed, the coarse particles having a particle size of 100 μm or more are
This is because coarse particles having a particle size of 300 μm or more cannot be pressed and dust is easily generated (see FIG. 2). In FIG. 1B, reference numeral 30 denotes coarse particles having a particle size of 100 μm or more, reference numeral 31 denotes fine particles having a particle size of 100 μm or less, and FIG.
Among them, the symbol “◯” indicates that no dust was generated, and the symbol “x” indicates that dust was generated.

When granulating the pseudo particles in the granulating step,
When the generated pseudo particle group is mixed with the coarse particle group and charged into the coke oven, the pseudo particle group preferably contains 90 wt% or more of pseudo particles having a particle size of 100 μm or more. When the coke oven may be charged alone at least (although it may be mixed with the coarse particle group, of course), 90 pseudo particles having a particle size of 100 μm or more are used.
75% by weight or more and pseudo particles having a particle size of 300 μm or more
It is desirable that the content is at least wt%. This is because when the amount of pseudo particles having a particle size of 100 μm or more in the pseudo particle group is less than 90 wt%, the amount of fine particles having a particle size of 100 μm or less increases too much, and the fine particles are adsorbed on the surface of the coarse particles. Can not be generated and dust is easily generated (Fig. 3
If the pseudo particles having a particle size of 300 μm or more in the pseudo particle group are less than 75 wt%, the pseudo particles having a particle size of 100 μm or more will be converted into the pseudo particles having a particle size of 300 μm or more when the coke raw coal is conveyed. This is because it cannot be pressed down and dust is easily generated.

9 pseudo particles having a particle size of 100 μm or more were used.
75w pseudo particles with a particle size of 300 μm or more and 0 wt% or more
The reason why t% or more is that since the pseudo particles are a combination of fine particles, the surface area of the single pseudo particles is larger than that of the single coarse particles, and the particles are not only strongly bound by the binder, This is because the pseudo particles have a cohesive force and are in a state where it is difficult to generate dust. In addition, when a binder is added to the fine particles in the granulation step, for example, when tar is used as the binder, 10 wt% or more, when tar slag is used as the binder, 15 to 18 wt% or more, that is, as compared with tar. It is desirable to add 50 to 80% more. This is because in all cases, if the addition amount is less than the above, 90 wt% or more of pseudo particles having a particle size of 100 μm or more in the pseudo particle group cannot be contained, and dust is easily generated (see FIG. 4). When a mixture of tar and tar slag is used as the binder, the addition amount thereof may be appropriately selected (specifically 10 to 18 wt% or more) according to the mixing ratio of the tar and tar slag.

The solid line a in FIG. 4 shows the relationship between the proportion of pseudo particles having a particle size of 100 μm or more in the pseudo particle group and the amount of tar added, and the broken line b in FIG. 4 shows the relationship in the pseudo particle group. It shows the relationship between the proportion of pseudo particles having a particle size of 100 μm or more and the addition amount of tar slag. FIG.
Among them, the amount of binder added is represented by the following formula (1). V _B = W _B / W _C × 100 (1)
However, in the formula (1), V _B is the binder addition amount (wt.
%), W _B is the weight of the binder (kg), and W _C is the weight of the coke raw coal (kg).

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. First, a coke raw coal pretreatment facility (hereinafter referred to as a pretreatment facility) 10 used in a coke raw coal pretreatment method according to an embodiment of the present invention will be described. As shown in FIG. 1, the pretreatment facility 10 is
A dryer 11 using steam as a heat source for drying water contained in the coke raw coal to 2 to 6 wt% and a coke raw coal treated by the dryer 11 have a particle size of 100 μm.
A wind-power classifier 12 for classifying the above-mentioned coarse particles into 95% by weight or more and 80% by weight or more of coarse particles having a particle size of 300 μm or more, and other fine particle groups,
Tar, which is an example of a binder, is added to the fine particle group that has been processed by the air classifier 12 and that has been collected (or collected) by the dust collector 13 and kneaded to obtain 9 pseudo particles having a particle size of 100 μm or more.
And a kneading machine (or agitation type granulator) 14 such as a pin mixer for granulating a pseudo particle group containing 0 wt% or more.

The particle size of the coarse particle group processed by the air classifier 12 is measured by a particle size measuring device (or flow control damper) 17 such as a screen or a light scattering device, and then the particle size measuring device 1
In accordance with the particle size measurement value of the coarse particle group measured in 7, the air supply amount control unit 18 is provided with a valve 19 provided in the middle of the air supply pipe 26 that connects the blower (or the air supply device) 16 and the wind power classifier 12.
The amount of air supply from the blower 16 is controlled by controlling the opening / closing amount of the blower 16. The particle size of the pseudo particle group processed by the kneading machine 14 is measured by a particle size measuring device 20 such as a screen or a light scattering device, and then the particle size measuring device 20 is measured according to the particle size measurement value of the pseudo particle group. However, the opening / closing amount of the valve 21 provided in the middle of the supply pipe 27 connecting the binder storage tank (not shown) and the kneading machine 14 is controlled to control the binder amount from the binder storage tank. .

Further, the water content of the coke raw coal dried by the dryer 11 is measured by a water content measuring device (not shown) and supplied to the wind classifier 12 in accordance with the water content of the coke raw coal. The amount and temperature of steam generated are controlled. In FIG. 1A, reference numeral 22 is a blower (or an exhaust fan) for sucking air in the dust collector 13, reference numeral 23 is a chimney for discharging the air sucked by the blower 22, 24 is a conveyor for conveying the fine particle group collected by the dust collector 13 to the kneading machine 14, and 25 is a coarse particle group classified by the wind classifier 12 or a pseudo particle group granulated by the kneading machine 14. The conveyor 28 for conveying the air to the coke oven 15 is a duct connecting the wind force classifier 12 and the dust collector 13.

Next, a pretreatment method for coke coking coal according to one embodiment of the present invention will be described. As shown in FIG. 1, first, the coke raw coal is put into the dryer 11,
Drying is performed until the water content in the coke raw coal becomes 4 to 6 wt% (drying step). Next, the coke raw material coal dried in the drying step is conveyed into the wind force classifier 12 to have a particle size of 1
95 wt% or more of coarse particles of 00 μm or more and a particle size of 30
A coarse particle group containing 80 wt% or more of coarse particles of 0 μm or more and a fine particle group other than that are classified (classification step). The fine particle group is sucked into the dust collector 13 through the duct 28.

Next, a fine particle group containing less than 5 wt% of fine particles having a particle size of 100 μm or more and recovered by the dust collector 13 in an amount of less than 5 wt% and 95 wt% or more of particles having a particle size of 100 μm or less is conveyed to the kneading machine 14 by the conveyor 24. After being conveyed, the mixture is kneaded while adding a predetermined amount of binder from the binder storage tank to obtain 90 pseudo particles having a particle size of 100 μm or more.
Pseudo particle group containing more than wt% is granulated (granulation step). On the other hand, a coarse hopper processed in the classification step and a pseudo particle group processed in the granulation step (the mixing ratio of the coarse particle group and the pseudo particle group is 3: 7 to 4: 7) are relay hoppers (Fig. After being transported to a copier (not shown), it is transferred from the relay hopper to a projector (not shown), and then projected from the projector into a carbonization chamber (not shown) of the coke oven 15.

As a result, by drying the coke raw coal in the dryer 11, a temperature of about 80 ° C. can be applied to the coke raw coal. As a result, when the coke raw coal is passed through the wind classifier 12, it is heated by self heat. For example, the water content in the coarse particle group is about 2.5 to 4 wt% and the water content in the fine particle group is 2 to 3 wt%.
Since it can be dried up to, it is possible to improve the quality of coke coking coal, it is possible to prevent energy loss during carbonization in a coke oven or during classification in the classification process, and further, the classification efficiency and The carbonization efficiency can be improved.

The coke raw coal is classified into coarse particle groups containing 95 wt% or more of coarse particles having a particle size of 100 μm or more and 80 wt% or more of coarse particles having a particle size of 300 μm or more, and fine particle groups other than the above, and 90% by weight of pseudo particles having a particle size of 100 μm or more by adding a binder to the particle group.
Since the pseudo particle group containing the above is granulated,
Even if the coarse particle group or the pseudo particle group contains fine particles or pseudo particles having a particle size of 100 μm or less, the fine particles or pseudo particles having a particle size of 100 μm or less are adsorbed on the surface of the coarse particles or pseudo particles having a particle size of 100 μm or more. And as a result of this,
It is possible to suppress dust generation when the coarse particle group and the pseudo particle group are conveyed to the coke oven 15 or charged. Furthermore, when a pseudo particle group containing 90 wt% or more of pseudo particles having a particle size of 100 μm or more is separately charged into a coke oven,
Although some dust may fly, the coarse particles and the pseudo particles are mixed and conveyed / charged into the coke oven 15. Therefore, the pseudo particles in the pseudo particles are Coarse particles having a particle size of 300 μm or more can be pressed onto the conveyor 25, and as a result, dust generation can be prevented more reliably.

Of course, the particle size of the coarse particles falling on the conveyor 25 after being processed by the air classifier 12 is determined by the particle size measuring device 1.
After the measurement in 7, the opening / closing amount of the valve 19 is controlled according to the particle size measurement value of the coarse particle group to control the amount of air supplied from the blower 16, so that the particle size of the coarse particle group can be reliably determined. Grain size 100
95% by weight or more of coarse particles of μm or more and particle size of 300μ
It is possible to contain 80% by weight or more of coarse particles of m or more. Similarly, after treating with the kneading machine 14,
After the particle size of the pseudo particle group falling on the conveyor 25 is measured by the particle size measuring device 20, the opening / closing amount of the valve 21 is controlled according to the particle size measurement value of the pseudo particle group, and the binder amount from the binder storage tank is controlled. Is controlled, the particle size of the pseudo particle group is surely 90% by weight of the pseudo particles having a particle size of 100 μm or more.
It can be contained as described above, and as a result, dust can be surely prevented as in the above.

[0024]

EXAMPLE Next, the result of the confirmation test of the pretreatment method for the coke coking coal according to the embodiment of the present invention will be described. (Example 1, Comparative Example 1) First, when pretreatment of coal was performed according to the method for pretreatment of coke raw coal according to one embodiment of the present invention (Example 1), and JP-A-62-1.
The ratio of coal at the inlet of the wind classifier, the ratio of coarse particle groups at the outlet of the wind classifier, and the kneader when the pretreatment of the coal is performed according to the method for producing dried and preheated coal described in Japanese Patent No. 92486 (Comparative Example 1). The proportion of the pseudo particle group at the outlet was examined. Table 1 shows the results. Caking coal was used as the coal in all cases, and the dust generation concentration was measured at the step portion where the dust is easily generated on the conveyer that conveys the coarse particle group and the pseudo particle group to the coke oven. In Example 1, a pin mixer was used as the kneader, and in Comparative Example 1, a kneader was used.

[0025]

[Table 1]

As is apparent from Table 1, the proportion of coal at the inlet of the wind classifier was the same as that of Example 1 and Comparative Example 1, but the proportion of the coarse particle group at the exit of the wind classifier was the same as that of Example. 1 was 97 wt% of coarse particles having a particle size of 100 μm or more and 81 wt% of coarse particles having a particle size of 300 μm or more, whereas in Comparative Example 1, the particle size was 100 μm.
The above was a group of coarse particles containing 94 wt% of coarse particles and 75 wt% of coarse particles having a particle size of 300 μm or more. On the other hand, the ratio of the pseudo particle group at the exit of the kneader is 3 wt% of the pseudo particles having a particle size of less than 100 μm in Example 1, and the particle size is 1
In contrast to the pseudo particle group containing 97 wt% of pseudo particles of 00 μm or more, in Comparative Example 1, the pseudo particle group containing 15 wt% of pseudo particles having a particle size of less than 100 μm and 85 wt% of pseudo particles having a particle size of 100 μm or more. Met. For this reason, in Example 1, no dust was generated when the coke coking coal composed of the mixture of the coarse particle group and the pseudo particle group was transferred to the coke oven or charged, but in Comparative Example 1, the dust was generated. It was confirmed that dust was generated at 1 g / Nm ³ .

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments, and all changes in conditions without departing from the gist are within the scope of the present invention. For example, in one embodiment of the present invention, the opening / closing amount of the valve 21 is controlled directly from the particle size measuring device 20, but the valve 21 is opened / closed according to the particle size measurement value of the pseudo particle group detected by the particle size measuring device 20. A binder amount control unit for controlling the amount may be provided.

[0028]

As described above, in the pretreatment method for coke raw coal according to claims 1 and 2, 95 wt% or more of coarse particles having a particle size of 100 μm or more and coarse particles having a particle size of 300 μm or more processed in the classification step are used. Since a coarse particle group containing 80 wt% or more of is used, it is possible to suppress dust flying as much as possible during transportation or charging into a coke oven. Therefore, it is possible to prevent the deterioration of the work environment and the deterioration of the quality of by-products due to dust generation. Particularly, in the pretreatment method for coke coking coal according to claim 2, since the amount of air supplied to the air classifier is controlled according to the particle size measurement value of the coarse particle group, 95 wt. %
As described above, the coarse particle group containing 80 wt% or more of coarse particles having a particle size of 300 μm or more can be reliably classified, so that dust generation can be further reliably prevented.

In the pretreatment method for coke raw coal according to claims 3 and 5, a particle size of 100 which is treated in the classification step is used.
95% by weight or more of coarse particles of μm or more and particle size of 300μ
a group of coarse particles containing 80 wt% or more of coarse particles of m or more;
Since a mixture with a pseudo particle group containing 90 wt% or more of pseudo particles having a particle size of 100 μm or more processed in the granulation step is used, dust is prevented from flying when the mixture is transferred to a coke oven or charged. It can be suppressed as much as possible. In the pretreatment method of the coke raw coal according to claim 4 or 5, pseudo particles containing 90 wt% or more of pseudo particles having a particle size of 100 µm or more and 75 wt% or more of pseudo particles having a particle size of 300 µm or more processed in the granulation step. Group, or a mixture of the pseudo particle group and a coarse particle group containing 95 wt% or more of coarse particles having a particle size of 100 μm or more treated in the classification step and 80 wt% or more of coarse particles having a particle size of 300 μm or more. It is possible to suppress dust flying as much as possible when the pseudo particle group or the mixture of the pseudo particle group and the coarse particle group is conveyed to or charged into the coke oven.

Particularly, in the pretreatment method for coke raw coal according to the fifth aspect, since the amount of air supplied to the air classifier is controlled according to the measured value of the particle size of the coarse particle group, the particle size 1
95 wt% or more of coarse particles of 00 μm or more and a particle size of 30
It is possible to reliably classify a group of coarse particles containing 80 wt% or more of coarse particles of 0 μm or more, and to reliably prevent dust generation. Further, since the addition amount of the binder supplied to the kneading machine is controlled according to the particle size measurement value of the fine particle group, a pseudo particle group containing 90 wt% or more of pseudo particles having a particle size of 100 μm or more, or a pseudo particle having a particle size of 100 μm or more is used. It is possible to reliably granulate a pseudo particle group containing 75 wt% or more of pseudo particles having a particle size of 90 wt% or more and a particle size of 300 μm or more, and further, it is possible to surely prevent dust generation, and an appropriate amount of binder to be added. By doing so, it is possible to prevent troubles such as dust generation due to change of coal type, defective rotation of the conveyor, and the like.

[Brief description of drawings]

FIG. 1 (a) is an explanatory diagram of a pretreatment method for coke coking coal according to an embodiment of the present invention. (B) It is explanatory drawing of the coarse particle group produced | generated by the same method.

FIG. 2 is a characteristic diagram showing a relationship between a ratio of coarse particles having a particle size of 100 μm or more and a ratio of coarse particles having a particle size of 300 μm or more in a coarse particle group, and dust generation.

FIG. 3 is a characteristic diagram showing a relationship between a dust concentration and a ratio of pseudo particles having a particle size of 100 μm or more in a pseudo particle group.

FIG. 4 is a characteristic diagram showing a relationship between a ratio of pseudo particles having a particle size of 100 μm or more in a pseudo particle group and a binder addition amount.

[Explanation of symbols]

10 Pretreatment Equipment 11 Dryer 12 Wind Classifier 13 Dust Collector 14 Kneader (Stirring Granulator) 15 Coke Oven 16 Blower (Blower) 17 Particle Size Measuring Device (Flow Control Damper) 18 Air Supply Control Unit 19 Valve 20 Particle Size Measuring instrument 21 Valve 22 Blower (exhaust fan) 23 Chimney 24 Conveyor 25 Conveyor 26 Air supply pipe 27 Supply pipe 28 Duct 30 Coarse particles 31 Fine particles

Claims (5)

[Claims] 1. A drying step of drying the moisture in the coke raw coal charged into the coke oven to 2 to 6 wt%, and a coke raw coal treated in the drying step having a particle size of 10
95 wt% or more of coarse particles of 0 μm or more and a particle size of 300
A coarse particle group containing 80 wt% or more of coarse particles of μm or more and a classification step of classifying into other fine particle groups are provided, and the coarse particle group treated in the classification step is charged into the coke oven. Therefore, a method for pretreatment of coking coking coal is characterized by preventing dust generation. 2. The amount of air supplied to the wind-powered classifier according to the particle size measurement value of the coarse particle group treated in the classifying step while classifying the coke raw coal in the classifying step with the air-classifier. The coke coking coal pretreatment method according to claim 1, wherein the pretreatment method is controlled. 3. A drying step of drying the moisture in the coke raw coal charged into the coke oven to 2 to 6 wt%, and a coke raw coal treated in the drying step having a grain size of 10
95 wt% or more of coarse particles of 0 μm or more and a particle size of 300
A coarse particle group containing 80 wt% or more of coarse particles of μm or more and a classifying step of classifying into other fine particle groups, a binder is added to the fine particle group treated in the classifying step, and kneaded to obtain a particle size of 100 μm or more. 90 wt% of pseudo particles
And a granulation step of granulating the pseudo particle group containing the above, a mixture of the coarse particle group processed in the classification step and the pseudo particle group processed in the granulation step is loaded into the coke oven. A pretreatment method for coking coking coal, which is characterized by preventing dust generation by being charged. 4. A drying step of drying the moisture in the coke raw coal charged into the coke oven to 2 to 6 wt%, and a coke raw coal treated in the drying step having a particle size of 10
95 wt% or more of coarse particles of 0 μm or more and a particle size of 300
A coarse particle group containing 80 wt% or more of coarse particles of μm or more and a classifying step of classifying into other fine particle groups, a binder is added to the fine particle group treated in the classifying step, and kneaded to obtain a particle size of 100 μm or more. 90 wt% of pseudo particles
75% by weight of pseudo particles having a particle size of 300 μm or more
A granulation step of granulating a pseudo particle group containing the above, a coarse particle group processed in the classification step, or a mixture of the pseudo particle group and a coarse particle group processed in the classification step,
A method for pretreatment of coking coking charcoal, characterized in that dust is prevented by charging the coke ovens respectively. 5. The coke raw coal is classified by an air classifier in the classifying step, and the fine particle group and the binder are kneaded by a kneader in the granulating step to granulate, and in the classifying step. The amount of air supplied to the air classifier is controlled according to the particle size measurement value of the processed coarse particle group, and the kneading is performed according to the particle size measurement value of the pseudo particle group processed in the granulation step. The pretreatment method for coke raw coal according to claim 3 or 4, wherein the amount of binder supplied to the machine is controlled.