JPS5851928A - Apparatus for receiving semi-coagulated particle - Google Patents

Abstract

PURPOSE:To take out a semi-coagulated substance after pulverization without re- fusing the same by a compact installation, by a method wherein a high temp. molten substance is scattered in a finely pulverized form and the pulverized semi-coagulated substance is received while tumbled on a porous inclined plate having jet orifices. CONSTITUTION:When a high temp. molten substance such as molten slag is flowed down from a nozzle X and scattered into a wind tunnel 4 while pulverized by the gas stream from a pulverizing apparatus 3, it is converted to a semi- coagulated condition and fallen on a porous inclined plate 6 jetting air from the jet orifices thereof. Semi-coagulated slag particles are tumbled while cooled and further moved along a similar porous inclined plate 7 while receives directional conversion to be discharged to a storage part 8. As described above, semi-coagulated slag after pulverization is coagulated and taken out by a compact installation without re-fusing particles.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for atomizing a high-temperature molten material, such as molten slag, by a granulating means such as a gas jet, and for receiving all the semi-solid particles after being blown off.

Molten slag discharged from blast furnaces, etc.
Due to the high temperature of 450 degrees Celsius, various heat recovery measures have been studied from the viewpoint of energy conservation in the steel process, and numerous proposals have been submitted. One method of recovering heat from this molten slag is to atomize the slag into granules, and then exchange heat with air etc. in a fluidized bed or packed bed to obtain hot air. There is. In such a method, the most difficult problem is re-fusion of the atomized particles on the receiving surface. As a countermeasure technology, for example,
No. 4-38331 forms a fluidized bed with powdered slag,
Droplet-shaped slag is dropped into the slag, and powder slag sticks to the surface, thereby preventing re-fusion. This method consumes the powdered slag rapidly and requires power to manufacture and supply the powdered slag, which is disadvantageous in terms of total energy saving, and problems remain with the quality and shape of the slag product. . Also, Jikoko Sho 56-7836
If the particles are directly received on the fluidized bed forming surface as in the above example, it is difficult to form a fluidized bed due to the distribution of the dropping slag particle size, and re-fusion occurs at places where the fluidized bed has collapsed.

This invention was made for the purpose of obtaining a technology that solved the problems in the prior art as described above when granulating and receiving high-temperature molten material such as molten slag. Features include a granulation device that atomizes high-temperature molten material and makes it fly, and a large number of inclination angles that correspond to the grain density to receive the semi-solidified grains that are scattered or falling. A semi-solid particle receiver is characterized by comprising a porous inclined plate having gas ejection holes, and a storage section for storing particles that roll and fall on the inclined plate.

In the following, the present invention will be explained in detail regarding the case where molten slag is targeted.

Gas collision method Q! When the slag is atomized and blown away, it becomes droplets and blown away. When slag droplets are flown through an atmosphere that is lower than the molten slag temperature, they gradually solidify from the surface toward the inside while being cooled by surface heat transfer. The time required for the slag particles to completely solidify while flying is, for example, several seconds when flying through air at room temperature, and the distance is several tens of meters.

Therefore, in order to make the molten slag atomization equipment compact, the slag grains must be received while they are still in a semi-solidified state.

At this time, re-fusion must not occur between slag grains.

The present invention has solved all of these problems, and will be described in detail below based on one embodiment with reference to the drawings.

FIG. 1 and FIG. 2 show a semi-solid granule receiver according to the present invention. In FIGS. 1 and 2, 1 is a slag tundish which functions as a molten slag reservoir, and molten slag is supplied by falling from a slag nozzle 2 provided at the bottom of the tundish. 3 is a granulation device, which in this example is an air nozzle.

The molten slag falling from the slag nozzle 2 is atomized by an air jet from this air nozzle and flies within the wind tunnel 4.

5 is a porous inclined plate, and has a large number of blowholes 6.

Reference numeral 7 is also a porous inclined plate having a large number of blowholes, and the horizontal components of each of the inclined plates 5 and 7 are perpendicular to each other in the horizontal plane. 8 is a storage section, a porous inclined plate 5,
The slag grains that have been transferred and fallen in sequence are stored.

A near blower 9 supplies air discharged from the blowholes of the porous inclined plates 5 and 7.

FIG. 3 shows details of the portion where the fumarole holes 6 are bored in the porous inclined plates 5 and 7. In FIG. 3, α indicates the angle formed by the porous inclined plate 5.7 with the horizontal plane.

Next, the operation of the semi-solidified grain receiving device mentioned above will be explained.

The molten slag in the slag tundish 1 is made to flow down from the nozzle 2, collides with the high-speed airflow from the granulator 3, becomes granular, and flies through the wind tunnel 4.

During flight, the granular molten slag is cooled from the surface and falls into a semi-solidified state onto the porous inclined plate 5 from which air is blown out through the blowholes 6.

The semi-solidified slag grains that have fallen onto the porous inclined plate 5 are
It is cooled by the air as a refrigerant ejected from the blowhole, and while rolling on the porous inclined plate 5, it moves to the porous inclined plate 7 for direction change, where it also rolls while being cooled by the air from the blowholes 6. Then, it is discharged to the storage section 8.

When semi-solidified slag particles fall onto the porous inclined plate 5,
The semi-solidified slag grains are strongly cooled by the air jets from the large number of blowholes 6, and the impact force against the porous inclined plate 5 is alleviated. The semi-solidified slag grains that have fallen onto the porous inclined plate 5 are detached from the porous inclined plate 5 by the air jet from the fumarole 6, and fall again by gravity outside the shadow I# of the blowing force of the air jet. .

While repeating this state, the semi-solidified slag grains roll along the surface of the porous inclined plate 5 while being cooled, and move onto the porous inclined plate 7.

In this way, the porous inclined plate 5 provides a surface free from stacks of slag particles to the slag particles flying from the granulator 3.

The jetting speed of the refrigerant (for example, air) from the blowholes 6 formed in the porous inclined plates 5 and 7 is set to be at least higher than the fluidization speed of the slag grains. Further, the inclination angle α and the slope length of the porous inclined plates 5 and 7 depend on the grain density.

Next, an example will be described.

Molten slag temperature: 1400℃ Atomization means: Air particle collision method Slag particle flight time: 0.5 sec (average) Slag particle size: 0.5 to 7.0 Inclination angle of perforated inclined plate: 25 degrees, The molten slag was atomized using the apparatus shown in FIGS. 1 to 3, and then cooled and collected.

FIG. 4 shows the relationship between the granulation rate of the molten slag and the granulation density on the porous inclined plate 5 at that time.

The hot refrigerant (eg, air) that has served to cool the molten slag droplets is removed from the outlet 10 shown in FIG. 1 and recovered by a heat recovery system.

Since this invention is constructed and operated as described above, it is possible to solidify and take out semi-solidified slag after granulation using continuous equipment without causing re-fusion between all the granules. I can do it.

[Brief explanation of drawings]

Fig. 1 is an overall side view of the semi-solidified grain receiving device according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a detailed view showing the fumarole portion of the perforated inclined plate, and Fig. 4 is , is a diagram showing the results of implementation of this invention. 1. Varnish lag tongue date 2. Varnish lag nozzle 3: Air nozzle 4: Wind tunnel
5: Porous inclined grain receiving plate 6: Fumarole 7
: Porous inclined plate 8: Discharge slag 9: Jet near blower 10: Discharge port. Figure 1 □□□- 4ri Figure 2 Figure 3 ○

Claims (1)

[Claims] A granulation device that atomizes high-temperature molten material and makes it fly, and a granulation device that has an inclination angle that corresponds to the reception density and has a large number of gas ejection holes to receive the semi-solidified particles that are scattered or falling. 1. A semi-solid particle receiving device comprising: a porous inclined plate; and a storage section for storing particles that roll and fall on the inclined plate.