JPS6289792A - Production of compressively formed coal - Google Patents

Abstract

PURPOSE:To obtain coke provided with uniformity, small in quality variation even at both low dry distrillation temperature and heating rate, by filling raw coal of mutually different grade into each compartment of the forming mold divided with partitioning plates followed by compressoin forming to make a layered structure by grade. CONSTITUTION:A forming mold 10 is so divided with partitioning plates 12 as to correspond to the central part 11b and wall-side part 11a along the walls in contact with the combustion chamber in a coke oven carbonizing chamber. Each of the resulting parts 11a and 11b is filled with raw coal of mutually different grade followed by compression forming of said coal in the absence of the partitioning plates 12 to make a layered structure, thus obtaining the objective coke.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the production of compression molded coal by filling and compressing coking coal of different grades into each chamber of a mold separated by a partition plate. Regarding the method.

[Conventional technology]

In general, the quality of coal used in coke ovens, including coking coal, is roughly divided into high-quality coal and inferior-quality coal, or low-grade coal.High-quality coal includes strong caking coal and single string caking coal.

Inferior quality coal includes weakly caking coal and slightly caking coal.

The quality of coke made from these coals is most influenced by the quality of the above-mentioned coal charged into the coke oven, but in addition, the bulk density of the coal charged into the coke oven carbonization chamber and the quality of the coke in the coke oven Heat reception is also affected by the direction.

Conventionally, as shown in Fig. 5, there is a top charge method in which coals of different grades are mixed and charged into each carbonization chamber 1 by being dropped by a charging vehicle through a charging hole 2 provided at the top of the chamber. Although it has been widely adopted, the quality of coke 3 produced by this method varies widely. Therefore, in order to improve the coking properties of coal, a method has been used to increase the bulk density of top-charged coking coal by compacting the pulverized coal part by utilizing the expansibility of coal during the coking process. There is. Specifically, raw coal is formed into briquettes using a mold in advance, and 30% of the briquettes are mixed with charging coal, which is non-briquette coal, to reduce the overall bulk density to 10%.
This is a partial charging method of briquette coal to increase the amount of coal. This method aims to increase the bulk density of coking coal and coke strength, but the bulk density of coke manufactured by the top charge method varies depending on its position in the height and length directions in the furnace. This difference is one of the causes of variation in coke strength. One method for reducing this variation in bulk density is a block charging method in which coal is formed into a block outside the coke oven and this block is charged into the furnace (inside the carbonization chamber). According to this method, since the raw coal is molded to have a constant bulk density, there is no difference in coke strength caused by a difference in bulk density at the position in the furnace.

[Problem that the invention seeks to solve]

However, the quality of coke is also affected by the way the coking coal receives heat during the coking process.
In such conventional methods, even in the block charging method, the quality of coke is not uniform between the side near the combustion chamber and the center of the coking chamber 1, which is sandwiched between combustion chambers 4 on both sides. There was a problem.

This invention was made by focusing on these conventional problems, and it solves the above problems by molding coking coal into layers with coal of different grades and charging it into a furnace. It is intended to.

[Means for solving problems]

In this invention, the inside of the mold for forming coal, which is coking coal, is divided into a wall side part along the wall in contact with the combustion chamber of a coke oven carbonization chamber and a central part between these two wall side parts. It is divided into corresponding partition plates, and the divided wall side chambers and central chamber are filled with different grades of coking coal, respectively.
The present invention provides a manufacturing method in which this is compressed and layered without intervening partition plates.

[Effect]

The wall side chamber and the central chamber, which are defined by the partition plate of the mold, are filled with raw coal of different grades, and the filled raw coal is compressed to create compression molding that forms layers on the quality side. You can get charcoal.

〔Example〕

The present invention will be explained below based on the drawings. 1 to 4 are diagrams showing an embodiment of the present invention.

First, the structure will be described. Reference numeral 10 is a mold for compression molding raw coal to form blocks. The interior of this mold 10 is partitioned by a partition plate 12 into wall-side chambers 11a, l.
la and a central chamber 11b. This wall side room 1
1a and the central chamber 11b are wall side portions 1 along the walls 5 that are in contact with the combustion chambers 4 on both sides of the coking chamber 1 of the coke oven.
a, 1a and the central portion 1b between the two wall side portions 1a in terms of length, width, height, etc.

13a and 13b are coal storage tanks for raw coal, and 13a and 1
Coal of different grades is stored in 3b. 14
1 is a hopper, and 15 is a gate damper that opens and closes this hopper. Reference numeral 16 denotes a pressing plate that presses the coal charged into the mold 11 from the side to form blocks, and also pushes out the formed coal blocks to the pedestal 17.

Next, the action will be explained.

Poor quality coal is stored in the coal storage tanks 13a, 13a, and high quality coal is stored in the coal storage tank 13b.

The mold 10 and the hopper 14 are divided into a wall chamber 11a and a central chamber 11b by a partition plate 12, as shown in FIG.

Next, the raw coal is put into the hopper 14 separated from the coal storage tanks 13a and 13b on the high quality side, and when the gate damper 15 is opened, the poor quality coal goes into the wall side chambers 11a and 11a, and the high quality coal goes into the central chamber 11b. charged. Next, after pulling up the partition plate 12, the press plate 16 is driven to the right in FIG. Become.

Next, the pressing plate 16 is operated while leaving the briquette M, which has become the regular shape, at the right end of the mold 10 in FIG.
Lower the partition plate 12 to separate the wall side chamber 11a and the central chamber 1 again.
1b (see FIG. 2(a)). Next, the gate damper 15 is opened, and raw coals of different grades are charged into the wall side chamber 1a and the central chamber 11b, respectively, as in the previous case. When the charging is completed, the partition plate I2 is pulled up again, and then the press plate 16 is When it moves to the right, the raw coal is compressed between the previous briquette M1 and the press plate 16, and becomes briquette M2 which is stratified in the same way as M+ (see FIG. 2(b)). Next, briquette M
, is extruded to the pedestal 17, and the briquette M2 is left at the right end of the mold 10 (see FIG. 2(C)).

Thereafter, by repeating the above-mentioned operation, stratified and block-shaped briquette coal can be continuously produced. Thereafter, it is cut into a predetermined size according to the width of the coke oven and charged into the carbonization chamber l.

Next, the results of improving the quality of coke using the briquette produced according to this example will be explained. This coke was charged into an indoor furnace test furnace (furnace width: 40 cm, charge amount: 250 + r), and carbonized at a carbonization temperature of 1150° C. to examine coke properties.

Table 1 Properties of Charged Raw Materials Table 1 shows the properties of the coking coal, FIG. 3 shows the test results for the tensile strength of the coke, and FIG. 4 shows the test results for the microstrength. Figure 3.4 shows that compared to the single raw material A, the split raw material B, which is stratified by grade, has improved micro strength as well as tensile strength in the middle part of the coal (center part 1b) and is made more uniform throughout the coke. .

〔Effect of the invention〕

As explained above, in the present invention, the inside of the mold for forming coking coal is divided into a wall side part along the wall in contact with the combustion chamber of the coking chamber, and a wall side part of both of these wall sides. The manufacturing method is to divide the raw coal into sections corresponding to the central part between the two using partition plates, fill the wall side chambers and the central chamber with coking coal of different grades, and stratify the coal by compression. Even if low-grade coal is charged on the wall side, the carbonization temperature is high and the heating rate is high, so the deterioration in coke quality is small, and high-grade coal is charged on the inside (center) side of the coal to produce compression-molded coal. Therefore, even if the carbonization temperature is low and the heating rate is low, it is possible to produce high-quality coke that is homogenized and has small variations.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment according to the present invention, and FIG. 2 is a sectional view taken along line A-A in FIG.
, fc1 is an explanatory diagram of each step of the briquette manufacturing method, and 3.
FIG. 4 is an explanatory diagram of the quality of coke made from the briquette coal produced according to this embodiment, and FIG. 5 is an explanatory diagram of the conventional example. 1...Carbonization chamber, 1a...Wall side part, ■b
...Central part, 4...Combustion chamber, 5...
・Wall, 1o...Mold, Ila...Wall side chamber, llb...Central chamber, 12...Partition plate Patent applicant Kawasaki Steel Co., Ltd. agent Person Patent attorney Tetsuya Mori Agent Patent attorney Yoshiaki Naito Attorney Patent attorney Masaaki Shimizu 2 Figure 3; Figure 4

Claims (1)

[Claims] In a method for producing compressed briquette coal in which coking coal for a coke oven is filled into a mold, and the coking coal is compressed and molded, the interior of the mold is lined along a wall in contact with a combustion chamber of the coke oven carbonization chamber. The wall side chamber and the central chamber are divided by a partition plate so as to correspond to the wall side portion and the central portion, respectively, and raw coal of different grades is filled into the divided wall side chamber and the central chamber. A method for producing compression briquette coal, characterized by carrying out compression stratification without intervening plates.