JP2808759B2 - Coke shear stress pulverization test equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coke shear stress pulverization test apparatus for evaluating the quality of coke.

[Conventional technology]

In evaluating coke quality, it is extremely important to measure coke strength. Conventionally, the strength of such coke is conventionally measured by the following test method.

Rotational strength test method Drum strength (JIS) Tumbler strength (ASTM) b. Drop strength test method Shutter strength In the case of blast furnace coke, the coke strength has an important effect on the operation of the blast furnace. That is, when the strength of the coke charged in the blast furnace is low, the permeability in the blast furnace deteriorates, and as a result, the tapping ratio decreases, and the fuel ratio and the coke ratio increase.

Therefore, it is important to accurately measure the strength of blast furnace coke.

[Problems to be solved by the invention]

When the coke charged in the blast furnace descends inside the furnace,
Powdering of the coke due to shear stress occurs. However, in the above-described conventional test method, the powdering behavior of coke under shear stress at the time of descent in the blast furnace has not been evaluated.

Accordingly, an object of the present invention is to evaluate the pulverization behavior of coke caused by shear stress when coke is dropped in a blast furnace, and to measure the coke strength in the state closest to actual operation. It is to provide a chemical test.

[Means for solving the problem]

The test apparatus of the present invention includes a coke storage box for storing coke to be tested, an upper end being open and a bottom wall being openable and closable, and a coke placed on the upper surface of coke in the coke storage box. A weight for applying a fixed load, wherein the coke storage box is provided with a pair of fixed side walls provided in parallel at a fixed interval, and at a fixed interval between the pair of fixed side walls, A pair of oscillating side walls, which are provided in parallel with and perpendicular to the fixed side walls and which oscillate in the width direction of the pair of fixed side walls around the lower ends thereof, and a driving mechanism of the pair of oscillating side walls. It is characterized by having

Next, the device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing an embodiment of the apparatus of the present invention, and FIG. 2 is a schematic plan view thereof. As shown in the drawing, the coke storage box 2 in the apparatus of the present invention has a structure capable of storing the coke 1 to be tested and applying the same vibration to the coke as occurs when the raw material falls in the blast furnace. A weight 3 for applying a predetermined load to the coke 1 is placed on the upper surface of the coke 1 in the storage box 2.

The coke storage box 2 is provided with a pair of fixed side walls 4 and 4 provided in parallel at a fixed interval, and at a fixed interval between the fixed side walls 4 and 4 to be parallel to the fixed side walls 4 and 4 at right angles. Provided 1
It comprises a pair of vibrating side walls 5,5 and a bottom wall 7 which can be opened and closed about a shaft 6.

The pair of vibrating side walls 5, 5 are arranged inside the fixed side walls 4, 4 in the width direction, and the height thereof is higher than the fixed side walls 4, 4. The lower ends of the pair of vibrating side walls 5,5 are axially mounted on parallel shafts 8,8,
The upper ends are connected to each other by connecting rods 9, 9 via a shaft 10.

Reference numeral 11 denotes a driving mechanism for vibrating the pair of vibrating side walls 5, 5. The driving mechanism 11 includes a motor 12, a crank mechanism 13 for changing the rotation of the motor 12 into horizontal reciprocating movement, and a crank mechanism. A crank rod 14 for transmitting the horizontal reciprocating movement by 13 to the vibration side walls 5, 5, and the tip of the crank rod 14 is mounted on one vibration side wall 5. When the motor 12 is driven, the pair of vibrating side walls 5, 5 is turned into a pair of fixed
The inside vibrates in the width direction of the fixed side walls 4, 4 with their lower ends as shafts 8, 8.

Reference numeral 15 denotes a hydraulic cylinder for opening and closing the bottom wall 7, and a tip of the rod 15 a is axially attached to one end of the bottom wall 7. Therefore, the bottom wall 7 opens and closes about the shaft 6 by operating the hydraulic cylinder 15.

(Operation)

The bottom wall 7 is closed, a predetermined amount of coke 1 to be tested is stored in the coke storage box 2, the weight 3 is placed on the upper surface thereof, and a predetermined load is applied to the coke 1.

Next, the driving mechanism 11 vibrates the pair of vibration side walls of the storage box 2 at a predetermined frequency and amplitude for a certain period of time.

Thus, the coke 1 in the coke storage box 2
Then, after applying a predetermined load and applying vibration, the bottom wall 7 is opened and the coke 1 is discharged from the storage box 2. Next, the discharged coke 1 is sieved, and the degree of powdering, that is, the strength, is measured by measuring the ratio on the sieve.

〔Example〕

Using the above-described apparatus of the present invention, the degree of powdering of ordinary coke and low-strength coke, that is, the cumulative particle size on a 3 mm sieve was measured under the following conditions.

(1) Frequency: 40 to 90 rpm (2) Amplitude: 30 to 120 mm (3) Load: 50 to 250 kg (4) Test time: 30 minutes (5) Coke volume: 50 kg See Figs. 3 and 4 The measurement results are shown. In the drawings, the symbol ● indicates normal coke, and the symbol ▲ indicates low-strength coke. FIG. 3 shows the cumulative strength on a 3 mm sieve of coke when the amplitude was changed to 60 mm and the frequency was changed, and FIG. 4 was used to change the amplitude to 60 rpm and the vibration was changed. This is the cumulative particle size on a 3 mm sieve of coke. When coke falls in the blast furnace, the vibration conditions that best match the pulverization behavior caused by shear stress are:
It is considered that the frequency is 60 rpm, the amplitude is 60 mm, the load is 50 kg, and the test time is 30 minutes.

〔The invention's effect〕

As described above, according to the present invention, when the coke descends in the blast furnace, the pulverization behavior caused by the shear stress is evaluated, and industrially, the strength of the coke can be measured in a state closest to the actual operation. A useful effect is provided.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the apparatus of the present invention, FIG. 2 is a schematic plan view thereof, and FIG. 3 shows the results of measurement using the apparatus of the present invention. Graph showing the relationship with the cumulative particle size.
It is a graph shown by the relationship with a sieve accumulated particle size. In the figure, 1 ... coke, 2 ... coke storage box, 3 ... weight, 4 ... fixed side wall, 5 ... vibrating side wall, 6, 8, 10 ... shaft, 7 ... bottom wall, 9 ... ... connecting rod, 11 ... driving mechanism, 12 ... motor, 13 ... crank mechanism, 14 ... crank rod, 15 ... hydraulic cylinder.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01N 3/00-3/62 G01N 33/22

Claims (1)

(57) [Claims] 1. A coke receiving box having an open top and an openable bottom wall for containing coke to be tested, and a fixed coke mounted on the top of the coke in the coke receiving box. A weight for applying a load, wherein the coke storage box is provided with a pair of fixed side walls provided in parallel at a fixed interval, and a fixed interval between the pair of fixed side walls. A pair of oscillating side walls oscillating in the width direction of the pair of fixed side walls with the lower ends thereof as axes, and a driving mechanism for the pair of oscillating side walls. A coke shear stress pulverization test apparatus.