JPS5930500A - Production of briquette - Google Patents

Abstract

PURPOSE:To obtain briquette having high strength of an original shape and having good quality and characteristics irrespectively of the moisture and grain size of raw material coal, by forming the raw material coal at the gap of forming rolls regulated at a specific ratio with respect to the diameter of rolls. CONSTITUTION:Raw material coal is formed at the gap of forming rolls regulated at 0.2-0.7% of the diameter of the rolls in the stage of producing briquette to be used for production of coke. A required amt. can be supplied into the mold on the roll surface without preliminary processing such as addition of water to the raw material coal on the rolls and addition of a binder or the like and the briquette having high quality is produced in a high yield. If the peripheral speed of the forming rolls is regulated to 0.6-1.0m/sec under the above-described conditions, the preferable output is obtd. If the briquette is produced under such conditions, the productivity of a coke furnace and the quality of the produced coke are made stable at all times and the reduction in installation and maintenance costs is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing briquette coal for use in the production of coal.

As is well known, the instability of coal properties has a great effect on the operation of coke ovens and on the quality of coke, so pre-treatment of coal is very important.

] - As a measure to improve and stabilize the quality of coal, a briquette blending method in which part of the charged coal is replaced with briquette coal is often used.

In producing this briquette coal, the method generally used is to use a device configured as shown in Figure 1. A horizontal kneader 6 is heated with steam 5 and kneaded while adding 3 m of water and pine/2-4 at a ratio of 17 m to the weighed amount to the raw material. 7/2-After coating, molding is performed using molding rows 1 to 7 to produce molded coal.

Therefore, conventional briquette f! ! The manufacturing method involves fixing the number of millimeters on a forming roll to a constant value of 0.5 mm, and as the roll rotates, the raw coal for synthesis coal is bitten into a forming mold formed in a wig shape on the surface of the forming roll. The raw coal supplied to the molding row is given optimal slipperiness so that the particles are held properly, and excessive supply of raw coal into the wig is prevented. In order to provide this slipperiness, water was added to the raw coal on the forming roll so that the moisture content was 14 to 15%. In other words, if this slipperiness is not provided, if raw coal is supplied in excess to the molding E-fly, it will be pressurized and compressed by the molding row 1, and then it will leave the molding row O-1 and the elasticity of the raw coal will decrease. This is because the restoring force acts to cause breakage or cracking, which prevents the briquette from retaining its original shape and impairs the yield of the finished product.

The moldability in this conventional method (Fig. 2(a) to (
As shown in the 'e pull of e), the powder and granules are JJ11 King's Seven-
) It is thought that a molded product is formed after being fed into a mold and subjected to compressive force.

In Figure 2, (a) shows the supply, (b) shows the compression at the bottom (backflow phenomenon), (c) shows the compression at the center, (d) shows the compression at the top, and (e) shows the discharge mode. show.

That is, in FIG. 2(a), raw coal is drawn into the seven-fold chamber by the rotation of the forming rolls and filled with it.

In (b) and <c), the compression of the coking coal filling chamber gradually progresses from the mode F direction, and the porosity decreases. At the same time, according to the fluidity of the material, some of the molded coking coal in f II/do moves in the direction of less resistance, i.e., in the direction opposite to the direction of rotation, as the pressure decreases. 1
Trying to get out of B (reflux phenomenon). This prevents oversupply.

In (d), the molding is almost completed, and the final compression is performed at the upper part of the chamber 7-1.

In (e), briquette coal is formed when the molded product begins to separate from the mold, but if the coking coal is excessively supplied onto the rolls and is not smooth, the molding rolls shown in b in Figure 3 are used to form briquettes. Since the backflow phenomenon of coal is difficult to occur and the pressure during pressurization in (d) becomes excessive, the elastic restoring force of the coking coal acts as the briquette separates from the briquette 0-1, causing cracks or cracks in the briquette. This will result in cracks υ.

Figure 3 is a diagram showing a state in which raw materials have poor slipperiness and no backflow phenomenon due to excessive supply of raw materials into the seventh chamber; (a) shows the supply, (
b) Compression at the bottom (backflow phenomenon is less likely to occur), (C)
1 indicates compression at the center, (d) indicates compression at the top, (e) indicates coal particle size dp = ], 6 rmq, gap 0.5 pus, and no backflow is possible. 7 (f) indicates discharge. Indicates the status of

The present inventors conducted various experiments to solve the problem of the conventional coal production method, and conducted various experiments to solve the problem of cracking point in the conventional coal production method, and in order to obtain good moldability and quality, It was found that the effect was not as great as previously thought. The present invention was made based on this knowledge, and the moisture content of coking coal,
Regardless of the change in particle size: it provides a method for freely producing briquettes with claw-shaped strength and high quality properties as a raw material for coal, and its characteristics are as follows: Tokoro (1) The first set of Fy'Zi view role' [1-f
Ly? A method for producing briquette charcoal, characterized in that the charcoal is 0.2 to 0.7 inches thick.

(2) The peripheral speed of molding (]-+b is (1,6~1.. Om
The method for producing briquette coal according to (1), characterized in that:

(3) Reaction force between forming rolls (total pressure) 30 to 105t
The method for producing briquette coal according to (1) or (2), characterized in that the method is turned on.

(4) The method for producing briquette coal according to (1), (2), or (3), characterized in that raw coal having grains of 915 mm (maximum length) or less is used.

It is.

The reasons for each limitation in the present invention will be explained below.

First, mold the roll instep with a diameter of 0.2 to 0.7
The reason why qb is defined as qb is that if it is less than 0.2 inch as shown in Fig. 6, over-pressure molding will occur, and as mentioned above, when the molded coal separates from the molding roll, the molded coal will collapse due to the elastic restoring force of the coking coal. However, the yield of molten coal cannot exceed the practical yield of 80 inches, and if it exceeds 0.7 inches, the necessary pressurizing force cannot be obtained.
However, it is difficult to maintain a practical yield of 80 inches.

Next, set the peripheral speed of one molding call to 0.6 to 1.0 m/sec.
As shown in Figure 7, the circumferential speed is 0.6 m.
/see, a favorable production site cannot be maintained, and 1,0
This is because if it exceeds m/sec, the required crushing strength of the briquette coal cannot be maintained. .

Also, the reaction force between molding D and 1b (total 1,000 force) is 30 to 105t.
The reason why it is turned on is because, as is clear from FIG. 8, the practical yield of charcoal produced at 30 tons and 105 tons is maintained at 80 inches.

Figures 6 to 8 +! ! 2I is water staff 6-14 June 1y
1 m - with ordinary coking coal of 15 mm (maximum length) or less
T.

This shows the relationship between the yield of J1 type coal, [1-f] circumferential speed and molding crushing strength, inter-roll pressure and molded coal filtration, 1). By composition No. 41'l (e)
, (f), between the forming row 1 and the forming row 11.
By providing a predetermined instep and edge determined based on the diameter, it is possible to process low 11. It supplies the necessary amount to the surface of the ℃-hard, enables the expression of a favorable backflow phenomenon for DII/-H coking coal, and makes it possible to produce high-quality briquette coal with a high yield. be.

Figure 4 is a diagram showing the compression molding mode when the 0-ru f set is spread to 0.2 to 0.7 inch of the roll diameter, (a) is the supply, (1)) is the lower part. Compaction (backflow phenomenon), (c) is compression at the center, ((1) is compression at the top, (e) is a diagram showing the shape of the coal particle size dp = 1.7 mm, gaps 5 to 7. (f) is a diagram showing the state of discharge.

Next, Examples are shown in Table-1.

The raw charcoal has a moisture content of 4 to 14, grains of 115, Mrl (+W
(Ocho) The following equipment was used, and the apparatus shown in Figure 1 was used.

At the conventional 0.5 mm operation level in Comparative Example (5), as explained in Figure 2, the coking coal moisture on the D-ru was 1.
Stable operation is achieved with a 4-inch bell, but Comparative Example (6), in which the circumferential speed was uneven by Low 1 under this condition, resulted in quality deterioration due to a decrease in pressure molding time, and Comparative Example (7) When the roll moisture level is 10 degrees, the backflow phenomenon shown in Figure 3 becomes difficult, and even if the roll circumferential speed is reduced and the forming time is increased, the operation becomes extremely unstable, which causes a decrease in productivity, quality, and an increase in pieces. .

Therefore, the results based on the present invention are shown in Example (1), and among the conventional operating condition experiments (5), roll 4p1
By expanding with the shell, the backflow effect due to coking coal moisture and the fourth
Taking into account the effects shown in the diagram, the operation became extremely stable, and the amount of roll passing through the coal increased, which corresponds to the expansion of coal flow, and productivity improved due to the stabilization of the backflow phenomenon, and stable and improved quality was observed.

Based on this, in this example (2), when the coking coal properties and 〇-ru A setting were changed, an increase in the dry weight basis of the roll coal passing amount resulted in an increase in production, and further improvement was achieved by increasing the amount of rolled coal by 4 sets. . In Examples (3) and (4), results were obtained in which the effect could be improved, but in Example (4), the peripheral speed decreased in proportion to the production amount.

According to the present invention as described above, the necessary amount of briquette coal can be produced at the required quality level 1 without adjusting the added moisture and the acid of the vizier in accordance with the changes in the properties of the briquette coking coal during production of briquette coal as in the conventional method. As a result, it is possible to maintain stable workability (productivity of the cous oven, manufacturing) and the quality of the cous at all times, as well as reduce equipment costs and maintenance costs. The benefits are significant.

[Brief explanation of drawings]

Figure 1 shows the conventional briquette production process, Figure 2 (
a), (b), (c), (d), (e), Figure 3 (a)
, (b), <C), (d), (e), (f) Fig. 3 shows the state of compression molding by pressurizing raw materials in the molding machine of the molding machine. - Shows compression molding when expanded to 0.2 to 0.7% of the O-ru diameter. Fig. 5 and Fig. 6 are diagrams showing the manufacturing process and the process of production in a 4-point forming roll operation. It is a figure showing the relationship between charcoal yield and molding reaction force. 1... Raw material supply Koshibear 2... Koshibear scale 3... Water-added rice 4
・・・Baishijou-addition 5...Heating steam vessel 6...30 shishikniter 7...Ko Yadzu D-le 8... o -ILI -f se so zukyu pe@裡駅q, E 04 votes Old n Worship (Σ) Zhuang No. 8, 6, Type Han Ha (voltage power '7on)

Claims (1)

[Claims] 1 The 417 diameter of the forming roll is 0.2 to 0.2 of the row 1 sea 1.
A method for producing briquette coal, characterized in that the briquette is 0.7 inch. 2. The method for producing briquette coal according to claim 1r11, characterized in that the circumferential speed of the shaping roll is 0.6 to 1.0 m/sec. 3 The reaction force (total pressure) between forming rows 11 is 30 to 105 to
The method for producing briquette coal according to claims 1 and 2, characterized in that: nK. 4 Grain e 15 mn (i#Oicho) is characterized by using Type 11 coal of F. Claim 1 Peel 1L0
, Items 2 and 3, 11iV briquette V manufacturing method.