JPH0249093A - Method for charging raw material into coke oven - Google Patents

Abstract

PURPOSE:To eliminate uneven deposit distribution of a raw material and homogenize bulk density distribution of the raw material in an oven by inserting a leveler having respective dispersion plates for the raw material provided for each length between charging ports into a carbonization chamber. CONSTITUTION:A raw material is charged from charging ports 9 of a chamber oven type coke oven. In the process, a leveler 1 having dispersion plates 2 provided for each length between the charging ports 9 is inserted into a carbonization chamber 8. The respective dispersion plates 2 are then positioned just under the respective charging ports 9 to alternately repeat operations to change the flow of the dropping raw material with the dispersing plates 2 in the oven longitudinal direction and evacuate the dispersion plates 2 at intermediate positions between the adjacent charging ports and drop the raw material by own weight thereof. Thereby, bulk density of the raw material in the oven is homogenized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a coke oven raw material system for equalizing the high density of raw materials charged into a coking chamber from a coal loading car in a room furnace type coke oven. Regarding how to enter.

In the conventional method for charging raw materials into a room-type coke oven, raw materials are charged by falling under gravity from a plurality of hoppers mounted on a coal loading car through a table feeder through a charging port provided in the ceiling of the furnace.

The raw material charged in this way has a convex shape just below the charging port.
The material is piled up while maintaining a concave shape between adjacent charging ports and on the furnace lid side, and at the end of charging, the raw material directly below the charging port comes into contact with the furnace ceiling, which reduces the flow of gas generated from the raw material. It may interfere with the operation and cause the inability to operate.

To prevent this, a leveler attached to the extruder is inserted into the furnace to level the surface of the raw material and ensure gas flow. As described above, the leveler is an essential device in the current raw material charging method.

Next, the bulk density distribution of the raw material in the furnace in the above charging method will be described.

Immediately below the charging port, the raw material falls due to gravity, so the impact force increases in proportion to the falling distance, and the raw material becomes compacted in proportion to the impact force. Therefore, the bulk density of the lower part of the furnace, where the falling distance is longer, is higher than that of the upper part of the furnace. Then, the bulk density in the vertical direction expands roughly due to the static load action of the raw material after charging.

On the other hand, the material between the charging ports and on the furnace cover side is not subjected to direct impact, and even after being subjected to the static load of the material after charging, the material is less compacted than directly below the charging port with the same head.

Therefore, the bulk density is low.

In the current raw material charging method described above, there is inevitably a difference in bulk density in the furnace height direction and furnace length direction (furnace lid side - right below the charging port - between the charging port), and the leveler charging at the end of charging makes the material surface flat. Even after conversion, this bulk density difference does not disappear.

It is well known that such non-uniformity in the bulk density under the furnace of raw materials is the main cause of non-uniformity in coke quality (for example, Coke Circular-29(4) P, 2
09 (1980).

As a method and device for improving the non-uniformity of raw material density in the furnace length direction, a study was carried out in which a raw material distributor was installed just below the charging port of a large-scale test furnace, and the bulk density inside the model furnace was investigated (Cok
e&Cbemi 5tory, 1961, NO.
, 6, p. 22-2S), a method of incorporating a raw material distributor, a support, and a drive part into a coal loading car or a coal supplying device and introducing the raw material from a coke oven charging port into a coke oven, and a method of introducing the material into the coke oven (Japanese Patent Application Laid-Open No. 51-50906
No. Publication, Utility Model Application Publication No. 57-125747 @ Publication), etc. are known.

The former method of installing a raw material distributor directly below the charging port of a coke oven requires installing a distributor at each charging port of each house when applied to an actual furnace. This requires a lot of equipment costs. Furthermore, since the distributor is constantly exposed to high temperatures, it is necessary to construct it with refractory bricks, but it is structurally difficult to attach it to an existing coke oven.

Furthermore, raw material charcoal adheres to the distributor during operation, and removing this requires a lot of maintenance and management costs.

In addition, the latter method of introducing a distributor etc. from the charging port is as follows.
It is necessary to provide a drive device for each distributor corresponding to a plurality of charging ports, which increases equipment costs.

Furthermore, in either method, the raw material distributor has a constant shape and the flow of the raw material through the distributor is constant and cannot be changed, so that uniformity of the bulk density distribution of the raw material in the furnace cannot necessarily be satisfied.

Problems to be Solved by the Invention All methods for equalizing the bulk density of raw materials in a furnace using conventional distributors require large-scale equipment. In addition, the flow of the raw material through the distributor is constant, and it is not always possible to achieve high density uniformity in the furnace.

In order to eliminate the above-mentioned problems, this invention uses a simple device that uses a leveler attached to a coke oven extruder, and uses a dispersion means that can change the flow of raw materials to uniformize the bulk density of raw materials in the furnace. The object of the present invention is to provide a coke oven operating method for the purpose of.

Means for Solving the Problems In order to achieve the above object, the raw material charging method of the present invention is as follows:
A leveler with dispersion plates for raw materials arranged at each length between the charging ports is inserted into the carbonization chamber, and each dispersion plate is positioned directly below each charging port to direct the flow of falling raw materials in the direction of the furnace length. to make the bulk density of the raw materials uniform in the furnace.

In addition, as mentioned above, the dispersion plate is positioned directly below the charging port, and the flow of the falling raw material is changed in the furnace length direction by the dispersion plate, and the leveler is moved to move the dispersion plate to an intermediate position between adjacent charging ports. By alternately repeating the action of letting the raw material fall under its own weight, the high-density distribution of the raw material in the furnace is made uniform.

The above-mentioned dispersion plate may be a dispersion plate whose upper sides of two flat plates facing each other in a chevron shape are hinge-supported on a leveler so that the inclination angle can be adjusted freely, or two flat plate upper pieces facing each other with openings in a convex shape. A dispersion plate that is supported by a leveler with a support shaft and whose inclination angle can be adjusted is used.

If the leveler is inserted into the furnace and the dispersion plate is positioned directly below the charging port, and raw materials are charged, the falling raw materials will hit the dispersion plate and change the flow direction, falling and being dispersed in the length direction of the furnace. . This eliminates uneven stacking of the raw material and makes the bulk density distribution of the raw material in the furnace uniform.

Furthermore, by moving the leveler to alternately move the distribution plate to a position directly below the charging port and to an intermediate position between adjacent charging ports, the dispersion effect of the raw material is further enhanced.

In general, by changing the inclination angle of the dispersion plate more as the furnace height increases, the dispersion effect can be enhanced and the bulk density distribution in the furnace height direction can be made more uniform.

EXAMPLES Example 1 A dispersion plate provided in a leveler attached to an extruder according to the implementation of the present invention will be explained based on FIGS. 1 to 3.

Figure 1 shows a leveler (1) inserted into the carbonization chamber (8) through the leveling port, and a charging port (9) with a dispersion plate (2) installed on the furnace ceiling.
The state shown is that it is positioned directly below.

The above-mentioned distribution plate (2) is made by combining two flat plates in a chevron shape and placing the same number of levelers (1) for each length between the charging ports as there are charging ports (9).
), and as shown in Figures 2A and B, it is hinge-supported on the support shaft ('7) provided between the left and right side plates (1-1) and (1-2) of the leveler, and the leveler (1) is A rotary shaft (3) provided in the leveler along the longitudinal direction is passed through the inside of each dispersion plate (2), and the dispersion plate (2) is tilted by a cam (4) attached to the rotary shaft (3). and support.

Then, the rotary shaft (3) is made rotatable by the motor (5) provided on the base end side of the leveler, and the movement of the cam (4) changes the inclination angle of the dispersion plate (2) to, for example, 60 degrees (see Figure 2). A)
to 20 degrees (Fig. 2C).

Therefore, move the driving bag @ (6), insert the leveler (1) into the carbonization chamber (8) from the leveling port, position the dispersion plate (2) directly below the charging port (9), and move the motor ( 5), rotate the cam (4), adjust the inclination of the distribution plate (2) to a predetermined angle, and charge the raw material from the charging port (9). Then, the raw material hits the distribution plate (2), changes its flow, and falls.

In addition, the dispersion plate shown in Fig. 3 has two flat plates separated in a convex shape and facing each other with an opening (10), and the upper sides of each side plate (1-1) of the leveler (1) are connected to a support shaft (7). 1-2)
Support in between. Then, as in the embodiment shown in FIG. 2, the cam (4) attached to the rotating shaft (3) is used to maintain the tilt at an arbitrary angle. Therefore, if the dispersion plate (2) having this opening (10) is placed directly below the charging port (9) and the raw material is charged, the raw material will fall directly below from the opening (10) and the raw material will be dispersed. It is divided into two parts: one that hits the plate (2) and changes its flow in the direction of the furnace length and falls.

In addition, although the drawing shows the case where the two flat plates of the dispersion plate (2) are bilaterally symmetrical and have the same inclination angle, it is not necessarily necessary to make them bilaterally symmetrical. For example, since the temperature on the furnace lid side is generally low, if the bulk density of the raw material is increased, the coke quality may deteriorate. In such a case, a one-sided dispersion plate may be used to prevent dispersion to the furnace lid side, or the inclination angle of the flat plate on the furnace lid side may be reduced.

As mentioned above, the dispersion effect changes by changing the shape and inclination angle of the dispersion plate (2). Therefore, as shown in Fig. 5, we made a large-scale high-density measurement device for an actual furnace, inserted a leveler (1) with a dispersion plate (2) through a hole corresponding to the leveling port, and measured the raw material using a real coal car. Coal was charged, and the fall trajectory of the raw material coal with respect to the inclination angle of the dispersion plate and the accumulation of raw material inside the device were investigated. The results are shown in FIG. 6 and FIG. 8 B-G.

FIG. 6 shows the results of investigating how the flight distance of the raw material in the furnace length direction that hit the distribution plate (2) changes depending on the inclination angle of the distribution plate. In addition,! + is the distance between the charging port and between the charging ports, and z2 is the distance between the charging port and the furnace lid. From this result, the larger the inclination angle of the dispersion plate, the longer the flight distance in the furnace length direction, and when the inclination angle is 30 degrees or more, the dispersed raw materials are adjacent to each other in the lower part of the furnace between adjacent charging ports and in the middle part of the furnace. It is thought that the dispersion effect is reduced because it overlaps and coalesces with the raw material dispersed by the dispersion plate, and collides with the furnace lid.

Therefore, in order to maximize the dispersion effect, it is necessary to change the inclination angle of the dispersion plate according to the height of the raw material layer.According to the experimental results, as shown in Figure 7, At the time of charging, the inclination angle is 20 degrees, and as the height of the furnace becomes higher, the inclination angle increases, and it is desirable that the inclination angle is 60 degrees at the upper part of the furnace.

The raw material deposition situation obtained through the above experiment is schematically shown in FIG.

Figure 8B shows the case where the dispersion plate is placed directly below the charging inlet with an inclination angle of 20 degrees, and Figure 8C shows the case where the distribution plate is placed directly below the charging inlet with an inclination angle of 30 degrees. The dispersion effect is more pronounced than when the sample is dropped under its own weight from the loading port without a dispersion plate.

The eighth diagram shows the result of charging the raw material while changing the inclination angle based on the relationship between the furnace height and the dispersion plate inclination angle shown in FIG. In this case, it can be seen that the dispersion effect is further exerted and the bulk density distribution is made more uniform.

Figure 8E shows an operation in which the dispersion plate (2) is positioned directly below the charging port to change the flow of the falling raw material in the furnace length direction by dispersion (Figure 4A), as shown in Figure 4. ) and the action of moving the leveler (1) to retract the distribution plate (2) to an intermediate position between the adjacent loading ports and allowing the raw material to fall naturally (Fig. 4B) are repeated alternately. be. In this case, the bulk density distribution is further made uniform.

Figure 8F shows that when using the dispersion plate (2) with flat plates facing each other in an eight-figure shape with an inclination angle of 30 degrees as shown in Figure 3, and Figure 8G shows that the inclination angle varies between 20 degrees and 60 degrees. This is the raw material deposition situation when using a distribution plate with flat plates facing each other in a figure eight shape. In both cases, a sufficient dispersion effect was obtained.

Example 2 At the end of a coke oven bank, a large iron furnace bulk density measurement device (length 7920M, height 7210M, width 450M, volume 25M) was installed.
．． Insert a leveler with a dispersion plate into the 7 ml volume through the leveling port, and use the wet coal, moisture-conditioned coal, and molded coal shown in Table 1 from the two hoppers of the actual coal loading car, and use the wet coal, moisture-conditioned coal, and molded coal shown in Table 2. Charging was carried out using charging methods B to G according to the method of the present invention and, for comparison, using gravity drop method A without using a dispersion plate.

As shown in Figure 5, there are 3 rows in the furnace length direction (furnace lid side, right below the charging port, middle of the charging port) and 6 rows in the furnace height direction, for a total of 18 pieces, as shown in Figure 5. sampling hole (
11) After pushing a cylindrical iron container into the container and collecting the raw material, we weighed the raw materials and measured the total moisture content (JIS H8811), and determined the bulk density on a dry basis from the dry weight equivalent to the dry seal base and the internal volume of the sampling container. I asked for

Table 3 shows the bulk density distribution results when wet coal was charged.

Table 3 (bulk density distribution of wet coal): From the above results, in conventional method A without a dispersion plate, the bulk density directly below the charging port, which is subject to the impact of falling raw material, is higher than that on the furnace lid side and in the middle of the charging port. , the bulk density difference (range) in the furnace length direction is approximately 80
Kg/m3, B-G of the present invention exhibits a dispersion effect, and the bulk density decreases directly below the charging port, increases on the furnace lid side and between the charging port, and increases in the furnace length direction. The bulk density difference (range) is reduced to about 30 to 60 kg/m', and the bulk density can be made uniform in the furnace length direction.

Next, Table 4 shows the bulk density distribution results when the raw material obtained by adding briquette coal to the wet coal in Table 1 is charged, and the moisture content in Table 1 is
Table 5 shows the bulk density distribution results when charging raw materials prepared by adding molded coal to tempered coal that has been dry-adjusted to %. As a result, in all cases, the bulk density difference (range) was reduced in the method of the present invention, and the dispersion effect was exhibited.

Effects of the Invention In this invention, the bulk density distribution of the raw material in the furnace length direction is made uniform by the dispersion plate installed in the leveler of the extruder.
The device is simple and the equipment cost is low, and an excellent dispersion effect can be achieved, and the bulk density distribution in the furnace can be made uniform. Moreover, the dispersion effect can be further enhanced by changing the shape and inclination angle of the dispersion plate.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the main parts of a leveler having a dispersion plate inserted into a carbonization chamber for carrying out the present invention;
The figure shows details of the dispersion plate in Figure 1. Figure A is a front view;
Figure B is a side view, Figure 0 is a front view when the inclination angle is changed to a small value, Figure 3 is a front view when the dispersion plate has an opening at the top, and Figure 4 is the dispersion plate inserted into the carbonization chamber. Figure A is a front view when it is located directly below the charging port, Figure B is a front view when it is retracted to the center position between the charging ports, and Figure 5 is the measurement of large bulk density in an actual furnace. An explanatory diagram showing the main parts of the device, Figure 6 is a graph showing the relationship between the inclination angle of the dispersion plate and the flying distance of the raw material in the furnace length direction, and Figure 7 shows the furnace height position when the dispersion effect is enhanced. Figure 8 is a graph showing the relationship between the inclination angle of the distribution plate, and a schematic diagram showing the situation of raw material accumulation in the furnace due to different charging methods. When the inclination angle of the dispersion plate is 20 degrees, Fig. 0 shows the case where the inclination angle of the dispersion plate is 30 degrees, Fig. D shows the case when the inclination angle of the dispersion plate is changed, and Fig. E shows the case where the inclination angle of the dispersion plate is 30 degrees.
Fig. F shows the dispersion plate when a convex dispersion plate is used with a dispersion plate inclination angle of 30 degrees, and Fig. G shows the dispersion plate of Fig. This is the case where the inclination angle is further made variable. (A) Figure 1 Figure 2 (B) (C) Figure 3 Dispersion plate angle (θ) Furnace height cm)

Claims (1)

[Scope of Claims] 1. When charging raw materials into the furnace from the charging port of a chamber furnace type coke oven, a leveler having a distribution plate for the raw material arranged at each length between the charging ports is inserted into the carbonization chamber, A coke oven raw material charging method in which each distribution plate is positioned directly below each charging port, and the flow of the falling raw material is changed in the furnace length direction by the distribution plate, thereby making the bulk density of the raw material uniform in the furnace. 2. When charging raw materials into the furnace from the charging port of a room furnace type coke oven, a leveler with distribution plates for the raw material arranged at each length between the charging ports is inserted into the carbonization chamber, and each distribution plate is Located directly below the inlet, the dispersion plate changes the flow of falling raw materials in the furnace length direction, and moves the leveler to retract the dispersion plate to an intermediate position between adjacent inlets to allow the raw materials to fall under their own weight. A method of charging raw materials into a coke oven that is repeated alternately to uniformize the bulk density distribution of the raw materials in the furnace. 3. The method of charging raw materials into a coke oven according to claim 1, wherein a dispersion plate is used in which the upper sides of two flat plates facing each other in a chevron shape are hinge-supported on a leveler and whose inclination angle is adjustable. 4. The coke oven raw material charging method according to claim 2, wherein the upper sides of two flat plates facing each other in a chevron shape are hinge-supported on a leveler, and a dispersion plate whose inclination angle is adjustable is used. 5. The coke oven raw material charging method according to claim 1, wherein a dispersion plate is used, the upper sides of which are opposed to each other with a V-shaped opening supported on a leveler by a support shaft, and whose inclination angle is adjustable. 6. The coke oven raw material charging method according to claim 2, wherein a dispersion plate is used in which the upper sides of two opposing flat plates with a V-shaped opening are supported on a leveler by a support shaft and whose inclination angle is adjustable.