JPH061982A - Method for charging moisture conditioned coal into coke oven - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent dust scattering problems and carryover deterioration due to pulverized coal in the humidified coal charging method. [Composition] In the method of charging a conditioned coal in which the water content of the crushed charged coal is adjusted to less than 6% by weight and charged into a coke oven, in the conditioning process, the charged coal is a fine-grained coal portion and a pulverized coal. And then moistened so that the total water content in the pulverized coal portion is 10% by weight or more, and then mixed again in the fine coal portion and charged into the coke oven. [Effect] By a simple operation of adjusting the water content of the pulverized coal, it is possible to prevent the dust scattering problem and the carryover deterioration caused by the pulverized coal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for charging a controlled-conditioning coal into a coke oven which can suppress carryover when charging a controlled-moisture charged coal (hereinafter referred to as a controlled-conditioning coal) into the coke oven.

[0002]

2. Description of the Related Art In order to inexpensively produce good quality metallurgical coke in a chamber furnace type coke oven, it is necessary to use a large amount of inexpensive coking coal or non-caking coal having low cohesiveness. In a chamber furnace type coke oven, as a method for using a large amount of low-cost low-caking coking coal or non-caking coal, for example, the total water content of the charging coal normally contained in 8 to 10 wt% is 5-
1 method for charging humidified coal or 6% by weight
Preheated charcoal charging method to dry and preheat to 70-250 ℃ to reduce total water content to 2% by weight or less, 30-40% of normal charging charcoal is blended with briquette charcoal mainly composed of non-caking coal. Known methods include forming coal blending method and adding binder to improve the binding property of charging coal.

Among the above-mentioned methods, the wet-conditioning coal charging method for reducing the total water content of the charging coal to 5 to 6% by weight is, for example, as shown in FIG. The charcoal is supplied to the supply feeder 3, cut into the tube dryer 4 and heat-exchanged with the steam flowing in the tube to heat, and a large amount of water vapor evaporated in the tube dryer 4 is blown by the blower 5 through the dry dust remover 6 into the system. Discharge to the outside, total moisture 4
The fine coal 7 adjusted to 6 wt% is discharged from the tube dryer 4 by the discharge feeder 8 and mixed with the pulverized coal 9 collected by the dry dust remover 6 by the coke oven transfer conveyor 10. The pulverized coal 9 collected by the dry dust remover 6 is
Usually, it is 1-2% of the amount supplied to the dryer, and the total water content is 2-
It is about 4% by weight.

[0004] The above-mentioned method of charging the humidity-controlled coal is the usual total water content of 8 to 1.
As compared with 0% by weight of wet coal, it is possible to improve the quality of coke by improving the charging bulk density and reduce the amount of dry distillation heat by decreasing the water content. On the other hand, the wet-conditioning coal charging method not only increases the dust scattering during the transportation process to the coke oven due to the decrease in water content, but also increases the dust generation when charging the coke oven.
Scatters in the surrounding suburbs and causes pollution problems. Moreover, when charging into the coke oven, high-pressure ammonium water or steam is injected into the bend part of the rising pipe to collect hot air that replaces the charging coal charged in the carbonization chamber and the coal gas that is generated from the main intake pipe. The pulverized coal contained in the charged coal is sucked into the main collection pipe by the smokeless charging method in which the charged coal is charged, or the charged coal is charged with the rapid generation of coal gas in the carbonization chamber in the initial stage of carbonization. The pulverized coal contained therein flows into the main pipe of the air collection and becomes carryover, and is mixed into the coal tar.

The respective phenomena in the above-mentioned method for charging the conditioned coal become more remarkable as the total water content of the charged coal is lower. For this reason, in the usual method of charging the humidified coal, it is general to adjust the total water content of the charged coal to 4 to 6% by weight from the viewpoint of the above carry-over prevention. 2 to 2
If 4% by weight of pulverized coal is mixed as it is and charged into a coke oven, it causes a dust scattering problem and deterioration of carryover.

As a method for preventing the dust scattering problem and the carry-over deterioration caused by the pulverized coal in the above-mentioned conditioned coal charging method, a binder is added to the pulverized coal and agglomerated by pressure molding, The agglomerate is crushed and mixed with the remaining fine-grained coal and charged into a coke oven (JP-A-57-87489), powdered coke is mixed with the pulverized coal, and bituminous product is added and added. A method of pressure molding to agglomerate, mixing the agglomerate with the remaining fine-grained coal, and charging it into a coke oven (JP-A-58-1).
No. 36691) has been proposed.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention JP-A-57-87
In any of the methods disclosed in Japanese Patent Publication No. 489 and Japanese Patent Application Laid-Open No. 58-136691, it is necessary to add bituminous material or a binder to pulverized coal and press-mold it to agglomerate. It requires additional handling such as addition of agents and pressure molding, and has a drawback that the operation becomes complicated.

The object of the present invention is to eliminate the need for extra handling such as addition of the above-mentioned natural products and binders and pressure molding,
It is an object of the present invention to provide a method for charging conditioned coal into a coke oven that can prevent dust scattering problems and carryover deterioration due to pulverized coal.

[0009]

[Means for Solving the Problems] The inventors of the present invention have made extensive studies to solve the above problems. As a result, after adding water to the pulverized coal to humidify it and then mixing it with the remaining fine-grained coal and charging it into the coke oven, the dust scattering problem and carryover caused by the pulverized coal at the time of charging the conditioned coal are carried out. It was found that the deterioration of the above can be prevented, and the present invention has been reached.

That is, according to the present invention, in a controlled-coal charging method in which the water content of crushed charging coal is adjusted to less than 6% by weight and charged into a coke oven, the charging coal is finely divided during the conditioning process. Separated into charcoal part and pulverized coal part, the total water content of pulverized coal part is 10% by weight
After humidifying as described above, the fine grain coal is mixed again and charged into the coke oven.

[0011]

In the present invention, the charging coal is separated into the fine-grained coal portion and the pulverized coal portion during the humidity conditioning treatment, and the pulverized coal portion is humidified to have a total water content of 10% by weight or more. The water content in the pulverized coal portion, which has been reduced to 2 to 4% by weight in total, is 10% by weight or more, preventing dust scattering during transportation and charging to the coke oven, and carrying over normal wet coal charging as well. Below the law.

In the present invention, the total water content in the pulverized coal portion is 10
The weight percentage is set to 10% by weight of the total water content in the pulverized coal portion.
If the amount is less than the above, the carry-over suppressing effect is small, and in order to make the carry-over equal to or less than the ordinary wet coal charging method, it is necessary to set the total water content in the pulverized coal portion to 10% by weight or more. . The upper limit of the total water content of the pulverized coal is not limited, but the proportion of the pulverized coal in the charged coal is about 5%, and the water content of the pulverized coal becomes saturated when it rises to a certain extent, This is because it has almost no effect on the total water content of the entire charcoal.

[0013]

Example The pulverized charging coal having the particle size composition shown in Table 1 was adjusted to a total water content of 6% by using a tube dryer. At that time, the total water content of the pulverized coal collected by the dry dust remover was 2.3% by weight. The pulverized coal collected by this dry dust remover is used as it is, or as shown in Table 2, water is added to add a total water content of 6
After adjusting to ~ 20%, mixed with the remaining fine-grained charcoal part with a total water content of 6%, furnace height 7125 mm, furnace width 460 mm, furnace length 16
Each of them was placed in a 500 mm coke oven carbonization chamber for 1 week and then subjected to dry distillation. Also, after adjusting the total water content to 5% and adjusting the total water content of the pulverized coal collected by the dry dust remover to 20%, the same test is performed when the remaining water content of 5% is mixed with the remaining fine coal. It was Then, the amount of tar slag per ton of charged coal is calculated from the amount of tar slag separated by the decanter, and the sampled tar slag is washed with an organic solvent and then filtered, and the recovered solid is dried to measure the particle size distribution. At the same time, the amount of solids per ton of charged coal was determined. The results are shown in Table 2.

[0014]

[Table 1]

[0015]

[Table 2]

As shown in Table 2, Test No. 3 in which pulverized coal having a total water content of 2.3% by weight was directly mixed with fine-grained coal. In the case of No. 2, the carryover at the time of charging the coke oven was significantly increased, the solid content in the tar slag having a particle size of 0.3 mm or less was increased, and the tar slag amount was the test number. Compared with No. 1 wet coal charging, the increase is remarkable. Further, as shown in Table 2, as the total water content of the pulverized coal increases due to the humidification of the pulverized coal, carryover decreases, and the solid content in the tar slag having a particle size of 0.3 mm or less and the tar slag amount decrease. Test No. satisfying the conditions of the present invention. In case of 5-8, test N
o. Even if the tar slag amount is equal to or less than that of the wet coal charging of 1 and the total water content of the fine coal is reduced to 5% by weight (Test No. 8), the total water content of the pulverized coal is reduced. By increasing the, the increase in the amount of tar slag is suppressed.
From this, carryover that increases the amount of tar slag can be suppressed by adjusting the water content of the pulverized coal, and similarly with respect to dust generation during transportation to the coke oven and charging into the coke oven, visual observation revealed that Similar results were obtained.

[0017]

As described above, according to the method of the present invention, the dust scattering problem and the carry caused by the pulverized coal in the charging of the conditioned coal into the coke oven can be carried out by the simple operation of adjusting the water content of the pulverized coal. It is possible to prevent the deterioration of the overcoat.

[Brief description of drawings]

FIG. 1 is a system diagram of a general humidity control coal manufacturing facility.

[Explanation of symbols]

 1 Wet coal hopper 2 Conveyor 3 Supply feeder 4 Tube dryer 5 Blower 6 Dry dust remover 7 Fine coal 8 Emission feeder 9 Pulverized coal 10 Coke oven conveyor

Claims (1)

[Claims] 1. The water content of the pulverized charging coal is 6% by weight.
In the controlled-conditioning coal charging method in which the temperature is adjusted to less than 10 and charged into the coke oven, the charging coal is separated into a fine-grained coal portion and a pulverized coal portion during the humidity control treatment, and the total water content in the pulverized coal portion is 10 wt% or more. The method for charging the coke oven into the coke oven is characterized in that the coke oven is mixed with the fine grain coal again and then charged into the coke oven.