JPH07268351A - Coking coal preparation method - Google Patents

Abstract

(57) [Summary] [Objective] When coking coal, a method for adjusting coke coal is provided to prevent fine coal powder from becoming a dust state in a coke oven. [Structure] Coal transported through an air flow transport pipe 1 is separated into coarse particles A and fine powder B in a classifier 2, the coarse particles A are charged into a coke oven, and the fine powder B is gas G in a solid-gas separator 3 It is separated and recovered from the above, agglomerated by the agglomerator 4, and then charged into a coke oven. [Effect] Before the coal is charged into the coke oven, the coarse particles A and the fine powder B are separated, and the fine powder B is agglomerated into an appropriate size and then charged into the coke oven. The fine coal powder does not exist in the furnace, and the fine coal powder can be completely prevented from floating in the coke oven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing coke coal before charging it into a coke oven.

[0002]

2. Description of the Related Art Coke coal before charging into a coke oven is first crushed to an average particle size of about 1.0 mm, and then 1.
Send it as it is, 2. Partially agglomerate and send 3. It is sent to the coke oven by either agglomerating the whole and sending it. FIG. 3 is a side view of the coke oven and shows a partial cross section. The above 1. And 2. The grain size of coal particles charged in the coke oven by the method of 0.
Since the pulverized coal that does not reach 5 mm is included, the pulverized coal becomes a dust state and flows with the gas flow, while the coke oven charging port 6, the carbonization chamber 7, the rising pipe base 8, the rising pipe 9, and further. It adheres to the inner surface of the curved pipe 10 or the like and is deposited.
Therefore, not only periodical cleaning and removal are required, but sometimes smooth operation is obstructed.

The pulverized coal also enters the tar decanter and interferes with the separation of tar and ammonium hydroxide. Especially when charging dry coal or preheated coal, these tendencies become remarkable.
In addition, the above 3. In the case of the above method, the amount of agglomeration work becomes enormous, which increases the equipment cost of the agglomerator and raises the cost.

Many proposals have been made to deal with such a problem, and among them, one similar to the present application is disclosed in Japanese Patent Laid-Open No.
There is a technique disclosed in JP-A-2-135589.
Prior art example 1 is characterized in that a binder is added to coal charged in a coke oven in advance, pulverized coal is combined into pseudo particles, and the pseudo particles are compression-rolled, and further dried or preheated. This is intended to solve the dust generation problem in the dry coal method and the preheated coal method.

[0005]

However, the technique disclosed in Japanese Patent Laid-Open No. 62-135589 has the following problems. (1) When a part is agglomerated and charged into a furnace, fine powder exists in the remaining part, and this adheres and deposits to each part in the coke oven. (2) When the whole is agglomerated and charged into the furnace, the adhesion of fine powder is prevented, but the agglomeration work amount becomes unnecessarily large, the agglomerator equipment cost increases and the cost increases, and The bulk density of coal in the upper coke oven is reduced, and the quality of coke is reduced.

The present invention has been made to solve the above problems, and when coal is charged into a coke oven to form coke, fine coal powder is in a dust state in the coke oven. An object of the present invention is to provide a method for adjusting coke coal that does not float and adhere to and deposit on each part in the coke oven.

[0007]

According to the present invention, coal is separated into fine powder and coarse particles by a classifying means, and the coarse particles are directly charged into a coke oven, while the fine powder is agglomerated and then loaded into a coke oven. It is a method for adjusting coke coal which is characterized in that it is added.

[0008]

According to the method for adjusting coke coal according to the present invention, the coal is separated into fine powder and coarse particles by the classifying means,
The coarse particles are charged into the coke oven as they are, but the separated fine powder is agglomerated and then charged into the coke oven.
Fine powder does not enter the furnace, so that the inside of the furnace is not in a dust state.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart showing the process of the operating state of the first embodiment of the present invention. In the figure, 1 is an air flow pipe, 2 is a classifier, 3 is a cyclone type solid-gas separator,
4 indicates an agglomerator. As the figure shows,
In the embodiment, after the coal is transported in the air stream transport pipe 1 for preheating, it is separated into coarse particles A and fine particles B in the classifying device 2, and the coarse particles A are not processed as they are or are preheated. After receiving it, it is loaded into the coke oven. The fine powder B is separated and recovered from the gas G by the solid-gas separation device 3, agglomerated by the agglomerator 4 (for example, a briquette machine), and then charged into the coke oven.

As described above, the coal is separated into coarse particles and fine powder before being charged into the coke oven, and the fine powder is agglomerated by the agglomerator 4 into a proper size (for example, 53 mm * 53 mm * 28 mm). After that, it is charged into the coke oven together with the coarse particles,
It does not generate dust in the coke oven and can maintain smooth operation.

FIG. 2 is a flow chart showing the process of the operating state of the second embodiment. In the figure, 5 is a fluidized bed facility that serves as a classification means, and other symbols are the same as those in FIG. As is clear from the figure, in the case of the second embodiment, the fluidized bed equipment is used as the classification means, and the coal is charged into the fluidized bed equipment 5 and fluidized by the gas G, so that the coarse particles A and the fine powder are obtained. It is separated into B and the coarse particles A are charged into the coke oven as they are or after undergoing treatment such as preheating. The fine powder B is sent together with the gas G to the solid-gas separation device 3, separated and collected from the gas G by the solid-gas separation device 3, agglomerated by the agglomerator 4, and then charged into the coke oven.

As described above, also in the case of the second embodiment, the coal is separated into coarse particles and fine powder before being charged into the coke oven, and the fine powder is agglomerated by the agglomerator 4 into a proper size. Since it is charged into the coke oven together with the coarse particles after that, it does not become dust in the coke oven and the smooth operation can be maintained. In this case, the fluidized bed facility 5 can be used not only as a classifying device but also as a coal drying / preheating device.

[0013]

As described above, according to the present invention, before charging the coal into the coke oven, the coal is separated into coarse particles and fine powder, and the fine powder is agglomerated and then charged into the coke oven. As a result, fine coal powder does not exist in the coke oven and does not float in the gas flow in a dust state.
It is possible to reliably prevent the coal powder from adhering and depositing at various places in the coke oven, and to enable the normal operation of the coke oven for a long time.

[Brief description of drawings]

FIG. 1 is a flowchart showing a process of an operating state according to a first embodiment of the present invention.

FIG. 2 is a flow chart showing a process of an operating state according to a second embodiment of the present invention.

FIG. 3 is a side view showing a partial cross section of a coke oven.

[Explanation of symbols]

 1 air flow transport pipe 2 classifier 3 solid-gas separator 4 agglomerator 5 fluidized bed equipment 6 inlet 7 carbonization chamber 8 riser base 9 riser 10 curved pipe A coarse grain B fine powder G gas

Claims (1)

[Claims] 1. A method of separating coal into fine powder and coarse particles by a classifying means, charging the coarse particles as they are into a coke oven, while agglomerating the separated fine powder, and then charging into the coke oven. A characteristic method for adjusting coke coal.