JPS595722Y2 - Mixing and melting equipment for briquette coal raw materials and binder for coke - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for mixing and melting raw materials and a caking agent for briquette coal for coke.

Recently, in the steel industry, the use of round-shaped coal has been gradually increasing in order to increase the capacity of blast furnaces and save on strongly coking coal. , the blending ratio of slightly caking coal has increased, and recently the usage rate of steam coal has been gradually increasing.

Therefore, before forming a certain type of coal, complete mixing of these coking coals is required, and a small amount of caking agent (6-12%) is required.
The binder must be blended at the same time, and the binder must be dissolved so as to form a thin film evenly on the surface of each coal particle.

Moreover, mixing and spreading of the binder must be carried out continuously within a short residence time of 2 to 6 minutes in the apparatus.

Conventionally, the raw materials and binder mixed in advance are placed in a vertical kneader, and steam is blown directly into the mixer to mix and dissolve them. , Patent Application No. 131678 (1982), which was invented and filed earlier.
No. 13441), there is a method of effectively mixing and spreading by rotating a blade attached to a single shaft at high speed.

The present invention is directed to a type of coal raw material mixing and melting device that performs mixing and melting and spreading more strongly and effectively than the latter type of device.

In other words, in the device of the present invention, two or three eccentric shafts hang down from the top of a cylindrical tank, each is equipped with a scraping blade or an impact blade, and each is rotated in opposite directions by a single power machine. let

Because the rotating diameters are different, the charged raw materials rotate in large, small, and opposite spiral shapes, and because of the high speed, some raw materials are pulverized and others are mixed.

The outer wall has a double structure and is heated by an external heat source (electric heater, heating oil, steam), or cooled by cooling water that matches the properties of the mixed binder. It is equipped to maintain the optimum temperature for softening and melting, and is rotated at low speed.

In addition, the bottom plate of the cylindrical tank rotates at a low speed to facilitate mixing and dissolving the raw materials and binder.

The bottom disk has a double layer that is heated or cooled and rotates in the opposite direction to the outer wall.

In this manner, by rotating the outer wall portion and the bottom disc in opposite directions, the movement of the internal material and the effect of the swirling drift of the material due to the hanging axis are made more effective.

At this time, when the outer wall and the bottom disk are rotated in the same direction and at the same speed, coking coal particles will adhere and solidify around the entire contact area, which will gradually enlarge and eventually close the discharge port. This may result in a loss of capacity or closure, making it difficult to continue continuous operation.

Raw materials and binder are fed from the top of the cylindrical shape, and discharged through the discharge ports provided at 1 to 3 locations on the bottom disk and the fixed fixed disk provided closely at the bottom. When the outlets meet, the mixed and dissolved raw materials are discharged.

The rotation of the bottom disc is operated by a variable motor, so by changing its speed, the processing time and discharge amount of raw materials in the mixing and dissolving tank can be easily adjusted.

Explaining with reference to the drawings, raw coal 1 is continuously charged in a certain amount and enters the tank through the charging port 2.

If the binder 4 is liquid, it is ejected from the binder inlet pipe 3, and if it is of the same type, it is pulverized and continuously fed at a fixed ratio from an appropriate binder inlet (not shown). .

The hanging shafts 5, 6.7 are each connected to a single independent electric motor 8, 9.10 with a variable speed device, and the shafts 6 and 7 and 5 and 7 rotate at high speed in opposite directions, and each has a different shape. Wings are attached, and the turning radius is also large, medium, and small.

The outer surrounding wall 11 is double-layered and provided with an inlet 12 and an outlet (not shown) for a heating or cooling medium from the outside.

The bottom disc 13 has one to three outlets 14, and is double-layered, with an inlet 15 and an outlet (not shown) for a heating or cooling medium.

This outer wall portion 11 is operated by an electric motor 16 with a variable speed device.
In addition, the bottom disc 13 is operated by an electric motor 17 with a variable speed device.
Both are connected, and 11 and 13 rotate at low speed in opposite directions.

The raw material 1 and the binder 4 that have been introduced undergo complex drift due to the high speed rotation of the hanging shafts 5, 6.7 and the shape of the blades, and are also affected by the low speed rotation of the outer wall 11 and the bottom disc 13. This further complicates the drift.

A fixed disk 18 provided in close contact with the bottom disk 13
There is a discharge port 19 only at the marketplace, and when the discharge port 14 provided on the bottom disc 13 rotates and matches this, the mixed and melted raw materials and binder are discharged to the outside. The material is then guided to the shoe 20, sent to the stamping machine 21, and stamped there.

The processing time necessary for mixing and dissolving and the appropriate amount to be fed into the hollow molding machine can be determined by adjusting the rotation of the bottom disc 13 and the surrounding wall 11, in addition to setting the input amount.

Next, specific effects will be illustrated.

As a judgment of the effect of mixing, the volatile content of raw coal alone was 25%.
．． 3%, ash content 9.1% is mixed with 9.2%, and 8% of volatile content 32%, ash content 0.2% as a single binder is mixed to make 100%, and the calculation standard value is calculated. .

Next, the same formulation was processed for 5 minutes using conventional method A, prior application method B, and invented method C, and samples were collected from each of the 10 locations in Iga Logistics, analyzed, and the maximum deviation R and the average value were determined. I got X.

The results are shown in Table 1.

It was found that the method C of the present invention is the best. Next, there are various methods to determine the dissolution effect of the binder, but one example is to process the raw material and binder using the above method, and then mold them under the same conditions in a roll type or mold machine. Table 2 shows the results of the drum test of coke.

It was found that the method C of the present invention is the best. As described above, if the mixing and melting apparatus of the present invention is adopted, there is an effect that the mixing is good, the solubility of the binder is good, and the quality of the produced coke is also improved.

In addition, an experiment was conducted in which the conditions such as coking coal, caking agent, and processing time were the same, and the outer wall and the bottom disc were rotated in the same direction and at the same speed using the same equipment as the method C of the present invention ( The experimental data corresponding to Tables 1 and 2 are shown in Table 3 below, and the experimental data corresponding to Table 2 is shown in Table 3 below, respectively. and shown in Table 4.

According to Method D, both volatile content and ash content are clearly inferior to Method C of the present invention.

In addition, in method D, coking coal particles adhere and solidify around the entire contact area between the outer wall and the bottom disk, and the particles gradually enlarge, making it difficult to continue the continuous operation.

The strength of the coke derived from the raw material treated by method D is inferior to that of the coke derived from the raw material according to method C of the present invention.

It was also found that the strength was inferior to that of the coke derived from the raw material according to the method B of the prior application.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory cross-sectional view of the device of the present invention, and FIG. 2 is a cross-sectional view from 1 to 2 in FIG. 1. Brief explanation of drawing numbers 1...Coking coal, 2.
... Raw coal input port, 3 ... Binder feed pipe, 4 ... Binder, 5, 6.7 ...
- Drooping stirring shaft, 11... Outer wall part, 13...
...Bottom disc, 14...Discharge port, 18...
・・・Fixed bottom plate, 21... Hollow type machine.

Claims (1)

[Scope of utility model registration request] In a cylindrical tank having an outer cylinder and a bottom plate, a plurality of rotary shafts having the same or different types of blades driven from the outside are vertically provided at eccentric positions of the tank, and the outer cylinder and the bottom plate are rotated at different speeds in opposite directions. A device for mixing and melting raw materials and a binder for coking coal, which is connected to respective drive sources so as to rotate.