JPH0376787A - Method for charging coke oven with coal - Google Patents

Abstract

PURPOSE:To charge a coke oven with coal rapidly and uniformly at a high bulk density and at a lower equipment cost by giving the coal an initial velocity needed for its fall by using a hopper with its turntable inclined to a coal discharge port, and dropping the coal from the coal discharge port. CONSTITUTION:A hopper 1 for charging coal is provided at its bottom with an inclined turntable 2 which rotates by a driving gear 5. A conical tube 6 is set up on the driving gear, extending upward in the hopper. The turntable is inclined at 20-30 deg.C towards a coal discharge port 3, and provided at its one end with charge chute 4. When the driving gear works to allow the turntable to rotate, coal stored in the hipper is discharged from the discharge port at a high speed, and then drops down the chute at an initial velocity given by the inclination of the turntable. By this method, it is possible to increase the bulk density of coal placed in the oven, obtain coke of uniform strength, and attain higher productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a coal charging method for improving the bulk density of charged coal to be charged into a chamber coke oven.

BACKGROUND OF THE INVENTION Generally, a coal loading car is used to charge coal into the carbonization chamber of an indoor coke oven. This coal-loading car usually has 4 to 5
The charging coal stored in each hopper is guided by the rotation of the turntable installed at the bottom of the hopper, passes through the opening in the lower peripheral wall of the hopper, passes through the charging chute, and connects the charging chute to the furnace. The coal is charged into the carbonization chamber by gravity through an inner cylinder in a skirt that connects the coal charging port that opens at the top.

Therefore, while the charged coal falls to the lower part of the coking chamber where the height of the drop is large, the collision energy of the coal is large, and the coal is consolidated by its own weight as it is piled up high. The bulk density of the coal is large.

However, as you go to the top of the coking chamber, the falling height of the coal decreases, the collision energy of the coal decreases, and the consolidation effect also decreases, so the bulk density decreases as you go to the top.

In this way, if the bulk density of the charged coal in the coke oven carbonization chamber is uneven, the carbonization rate in each part will be uneven,
As a result, the strength and quality of the coke produced are non-uniform. It is known that coke strength increases by increasing the bulk density of the charged coal in the coke oven carbonization chamber.

As described above, methods for increasing the bulk density of charged coal include the stamping method (Japanese Unexamined Patent Publication No. 57-67684, etc.);
Preheated coal method (JP-A-57-78480, etc.), dry charcoal method (JP-A-58-191784, etc.), briquette blending method (JP-A-59-115384, etc.), accelerated charging method (Japanese Unexamined Patent Publication No. 58-142972, etc.), a method of adding a bulk density improver, and many other methods have been proposed and implemented.

However, except for the bulk density improver addition method, all methods require large-scale equipment. Furthermore, even if new equipment is not required, major equipment modification is required. Further, although the method of adding a bulk density improver does not have any problems in terms of equipment, adding oil causes a problem of swelling of the conveyor belt, and adding a surfactant causes a problem of high additive costs.

Furthermore, as a method of selectively increasing the bulk density of the coal in the upper part of the carbonization chamber, a method of compacting and adding vibration using a leveler installed in an extruder for the purpose of leveling the coal at the end of the charging stage (Japanese Patent Publication No. 59-18434 No. 2) has been proposed. However, there are various problems, such as thermal durability and the effect of vibration on the lining bricks.

Furthermore, as an improved device on the coal supply side of a coal loading car, there is a device in which a screw feeder is provided in a charging chute attached to the discharge port of a hopper (Japanese Utility Model Publication No. 63-39143). However, this also has problems such as increased equipment costs.

Problems to be Solved by the Invention As mentioned above, the bulk density of the coal charged into the coke oven carbonization chamber fluctuates in the height direction, making it difficult to obtain a homogeneous coke product. Both methods were uneconomical due to high equipment and modification costs.

In view of the current situation, the present invention proposes a method that enables uniform charging with high bulk density through high-speed charging without incurring large expenditures on equipment costs and the like.

Means for Solving the Problems In order to achieve the above object, the coal charging method of the present invention includes:
When charging coal loaded into a coal loading car from the coal charging port of a coke oven through a hopper with a turntable on the bottom into the coking chamber, a hopper with a turntable tilted toward the discharge port is used. The initial velocity of the drop is given to the drop, and the drop is dropped from the outlet.

The coal discharged by the hopper's tilted turntable is given an initial velocity and is dropped, allowing for faster charging compared to natural fall.

This high-speed charging increases the collision energy of the coal,
The compaction effect also increases due to the accumulated weight, and the bulk density of the packed coal increases. In addition, since the flow velocity of the coal that has fallen directly below the charging port in the furnace length direction increases, the bulk density between the charging ports and on the furnace lid side also improves, and the bulk density in the furnace length direction becomes uniform.

Note that it is desirable that the tilt angle of the tilt turntable be large from the viewpoint of high-speed coal charging, but if the tilt angle is too large, the effective volume of the hopper will decrease.
A slope in the range of ~30'' is desirable.

Example Example 1 An embodiment of this invention will be explained based on FIG.

Figure 1 is a sectional view showing the main parts of the hopper. At the bottom of the hopper (1), there is an inclined turntable (2) that is rotated by a drive device (5). An elongated conical cylinder (6) is erected.

The inclined turntable (2) has a coal discharge port (3)
Tilt within a range of 20 to 30 degrees toward (4 in the figure)
is the charging chute.

Coal is stored in the hopper (1), and the drive device (5)
When you move the tilt turntable (2),
Coal is pushed out from the discharge port (3) at high speed and falls inside the charging chute (4) with an initial velocity applied to it. Coal is therefore charged at high speed.

Example 2 In order to confirm the effects of implementing the present invention, an iron bulk density measuring device (height: 7210 mm, height: 7210 mm,
Width 450+nm, length 7920mm, volume 25.7m
A practical coal loading car equipped with a hopper having an inclined turntable as shown in Fig. 1 was installed so that coking coal could be charged. As sampling holes for measuring the bulk density of the charged coal, holes 1.5 m, 3.0 m, 4.5 m, 5.5 m, 6.
6 locations at 0 m and 6.5 m positions, and 1 location in the furnace length direction, directly below the charging port, on the furnace lid side, and in the middle of the charging port.
Eight pieces were placed.

The test was carried out using blended coal (raw material particle size 3 mm) that is normally used for charging.
83% by weight and 9.2% by weight of moisture) were charged as raw materials, and the bulk density of each sampling hole was measured. In addition, for comparison, a conventional hopper with a horizontal turntable was used to charge the material in the same manner, and the bulk density was measured.

The results are compared with the conventional method and are shown in Figure 3 as changes in bulk density in the furnace height direction. Furnace lid side (Figure a), right below the charging port (
It can be seen that the bulk density of the method of the present invention is improved compared to the conventional method both at the center of the charging port (Fig. b) and at the middle of the charging port (Fig. C).

Further, the average bulk density in the furnace height direction is summarized in Table 1. From this table, the bulk density of the method of the present invention is higher than that of the conventional method, and the overall average is also significantly improved.
It can also be seen that the difference in bulk density in the furnace length direction has decreased, and that the bulk density in the furnace length direction has also become uniform.

Table 1: Effects of the Invention The present invention uses a hopper with an inclined turntable to give the coal an initial velocity of fall and discharge it, thereby making it possible to charge the coal at a higher speed than when it falls naturally. As a result, the bulk density of the charged coal increases, the variation in in-kiln coke strength can be reduced, and productivity can be improved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing the main parts of a hopper for charging coal used to carry out this invention, Figure 2 is a cross-sectional view of a bulk density measuring device for charged coal, and Figure 3 is a bulk density test result. Fig. 2 is a graph showing the bulk density on the furnace cover side in Fig. 2, Fig. b is the bulk density right below the charging port, and Fig. C is the bulk density in the middle of the charging port. ■... Hopper 2... Inclined turntable 3
...Discharge port 4...Charging chute 5...Drive device Fig. 1 Fig. 2

Claims (1)

[Claims] When loading coal loaded into a coal loading car into the coking chamber from the coal charging port of a coke oven through a hopper with a turntable on the bottom, a hopper with a turntable tilted toward the discharge port is used to prevent the coal from falling. A method for charging coal into a coke oven, characterized in that coal given an initial velocity of 1 is charged by dropping it from a discharge port.