JPH07109467A - Method for preheated stamp charging of coal - Google Patents

Abstract

PURPOSE:To provide the subject method which improves productivity and prevents dusting without requiring the addition of a binder. CONSTITUTION:The whole of coal for coke making comprising coals with different caking properties is quickly heated to 300-500 deg.C, consolidated into a coal cake using coal in the softening and melting zone as the binder, and quickly charged into a coke oven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preheating stamping charging method for coal using coal in the softening and melting zone as a binder.

[0002]

2. Description of the Related Art Recently, in a coke oven, a method of charging a coke oven with a dryer or preheated coal has been adopted for the purpose of reducing the quality of coking coal by improving the quality of coke and improving the productivity of the coke oven. There is. As one of them,
A method of stamping using coal whose humidity is adjusted to about 10%, or a high-temperature crude coke oven gas generated from a coke oven for producing powdery coal containing water, as in JP-A-58-125782. By drying and preheating with, the tar contained in the crude coke oven gas is adhered to the coal in the drying and preheating process to form tar-containing preheated coal,
Then, the tar-containing preheated carbon was compacted to form a block having substantially the same shape as the coke oven carbonization chamber.The thus obtained tar-containing preheated carbon forming block was charged into the coke oven carbonization chamber and dried. There is a method of obtaining a product coke, that is, a method of directly exchanging heat between a gas generated from a coke oven and coal to preheat the coal, mixing tar in the generated gas into the coal, and stamping the tar as a binder.

In Japanese Patent Laid-Open No. 51-111801, granular coal and a binder are mixed to form a nodular mixture, and a predetermined amount of the nodular mixture is formed into blocks in a molding apparatus. Compress to form a preformed coal cake of a given size and a given bulk density, preheat this preformed coal cake to an elevated temperature to form a preformed and preheated coal cake, which preform and preheat There is known a method of charging the coal cake into a carbonization chamber of a coke oven battery, that is, a method of preheating coal and then adding tar as a binder and stamping.

[0004]

The above-mentioned wet coal stamping in which the moisture content of the coal is adjusted to about 10% and the moisture content is used as the binder improves the bulk density, but the high moisture content results in the carbonization time. Is greatly increased. Therefore, the productivity is 25% compared to the charging of pulverized coal as it is preheated.
There is a problem that the degree is also reduced. In addition, JP-A-58-
In the method of stamping tar as a binder in Japanese Patent No. 125782, since tar is self-consumed as a binder, there is a problem in that it cannot be used in chemical business such as manufacturing electrodes or carbon materials using tar as a raw material. Yes, and the material cost is high for charging coal for a coke oven that does not require a binder.

Furthermore, in the method of stamping by adding tar as a binder after preheating coal in JP-A-51-111801, tar is indispensable as a binder as described above, and therefore a coke oven which does not require a binder. There is a problem that the material cost is high for charging coal.

[0006]

[Means for Solving the Problems] In order to solve these problems, as a result of intensive development by the inventors, as a result, it is not necessary to add a binder such as tar as a binder, and non-fine coking coal is strong and weak. By utilizing the characteristic that it softens and melts more easily than caking coal, preheating using non-slightly caking coal that has been softened and melted by heating the entire amount as a binder, and by the stamping method,
It is an object of the present invention to provide a method that does not require the addition of a new binder, and that improves productivity and improves environmental friendliness by preventing dust generation. The gist of the invention is to rapidly heat the total amount of coal charged in a coke oven made of coal having different caking properties to 300 to 500 ° C., compact the coal cake using coal in the softening and melting region as a binder, and quickly It is a preheating stamping method for coal, which is characterized in that it is charged into a coke oven.

[0007]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a system diagram showing a preheating stamping system for coal according to the present invention. As shown in FIG. 1, the charging coal 1 is supplied to the hot air dryer 3 from the charging chute 2. On the other hand, fuel gas and air are blown into the hot air generating furnace 4, and the generated hot air stream is supplied from the lower part of the hot air dryer 3 and is dried by this hot air stream, and the entire amount of the coke charging coal for the coke oven is dried by this hot air dryer. Preheats to 300-500 ° C. The dust collected by the dust collector 5 such as a cyclone is mixed with the fine powder entrained in the hot air stream in the hot air dryer 3 and mixed with the preheated coal discharged from the discharge chute 6 provided on the hot air dryer outlet side. Then
The softened molten carbon is stirred in the coal blender 7 so that the binder effect is uniformly exhibited in the coal cake.

That is, the characteristics of non-slightly caking coal which is softened and melted more easily than those of strong and weak caking coal are utilized, and the non-slightly caking coal softened and melted by heating the whole amount is used as a binder. .
The exhaust gas, which is a high-temperature generated gas discharged from the coal blender 7 when it is transferred from the blender 7 to the stamping machine, is mixed and used as fuel gas with preheating gas.

As described above, the preheating temperature is set to 300 to 50.
The reason for setting the temperature range to 0 ° C is the temperature at which the non-slightly caking coal is softened and melted and the caking property of coal can be used as a binder, and the strong and weak caking coals are almost in the state before softening and melting. It is maintained at a temperature that does not cause coal cake formation.
It is also the temperature at which caking is exhibited and it can be used as coke oven coal. Therefore, if the temperature is lower than 300 ° C, the softening / melting region that can be used as a binder cannot be reached, and
If the temperature exceeds ℃, strong and weak caking coal will be in a softened and molten state, which is not preferable.

The blending ratio of the non-slightly caking coal for softening and melting necessary as a binder is preferably at least 3 to 5%. Above that, there is no problem in coal cake formation and there is no problem in coke quality.
Since the appropriate value of the blending ratio of the slightly coking coal varies depending on the coal type, it is set generally for the above purpose, and it may be determined individually by performing an offline carbonization test or the like based on the properties of the coal used.

The coal preheating equipment from the hot air dryer to the mixer is installed at the end or center of the coke oven gang, and the stamping machine 8 equipped with a stamping device is moved between the coal preheating equipment and the coke oven charging kiln 9. . Based on such an arrangement, preheated coal containing softened molten coal on the exit side of the coal blender 7 is made into a coal cake by a stamping device. This coal cake 10
Is charged into a coke oven charging kiln 9 for carbonization. In addition, the stamping device is, for example, width {furnace width −30 mm} × {furnace height − (200 to 400 mm)} × according to the coke oven.
It is composed of a box-shaped container with a refractory lining inside the depth {furnace length-furnace loading length}, equipped with a stamping device that can be compacted from the top, developed by rapid heating with a hot air dryer. A stamping machine is installed on the outlet side of the rapid heating equipment without deteriorating the caking property of non-caking coal, and it is immediately charged into the coke oven after stamping.

FIG. 2 is a detailed view of the stamping device according to the present invention. As shown in FIG. 2, the inside of the molded casing 11 is composed of the refractory lining 12, and as described above, the size and the shape adapted to the coke oven charging kiln are formed,
The preheated carbon 13 mixed with the binder having the caking property of coal in the softened molten coal region is stamped by the stamper 14 to form a coal cake. Thus, 300 ℃ ~ 50
By shortening the carbonization time by preheating at 0 ° C and increasing the bulk density by making coal into cake, the productivity is significantly improved compared to the conventional charging of pulverized coal at 200 ° C preheating.

[0013]

[Example] 30 non-lightly caking coals having a water content of 8 to 11%
%, 70% of cohesive coking coal in a coke oven is rapidly heated in a hot air dryer at 400 ° C. to dry the water to 3%, and the carbonization time is set to 6 hours. The carbonization time was halved compared to 200 ° C. In addition, the blending ratio of non-slightly caking coal for softening and melting necessary as a binder is set to about 5%, mixed with a coal blender, transferred to a stamping machine, and stamped with a stamper to form a coal cake. The bulk density of this coal cake is 1.0 t /
m ³ achieved at crushing strength 5t / m ^3, then charged from laterally pusher coal cake coke oven, and coking.

[0014]

As described above, according to the present invention, it is not necessary to add a binder such as tar as in the conventional preheating stamping, and the temperature is 300 ° C to 500 ° C.
The productivity is extremely high due to the shortening of carbonization time by preheating and the increase of bulk density due to coal cake formation, and the dust generation is smaller due to the coal cake charging compared to the pulverized coal charging, and sufficient environmental protection can be achieved. It has an extremely excellent effect industrially.

[Brief description of drawings]

FIG. 1 is a system diagram showing a preheating stamping system for coal according to the present invention,

FIG. 2 is a detailed view of a stamping device according to the present invention.

[Explanation of symbols]

 1 Charging coal 2 Charging chute 3 Hot air dryer 4 Hot air generating furnace 5 Dust collector 6 Discharging chute 7 Mixing machine 8 Stamping machine 9 Coke oven charging kiln 10 Coal cake 11 Molded casing 12 Refractory lining 13 Preheating coal 14 Stamper

Claims (1)

[Claims] 1. A coke oven charging coal consisting of coals having different caking properties is rapidly heated to 300 to 500 ° C., a coal cake in a softening and melting region is used as a binder to compact a coal cake, and the coal cake is quickly put into a coke oven. A preheating stamping charging method for coal, characterized by charging.