JPS5842017Y2 - Fluid collection tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fluidized collection tank in which a rotatable aeration tube is provided in a fluidized bed portion in order to collect slag droplets, cool and solidify them, and obtain slag powder.

As an apparatus for dry granulating metallurgical slag such as molten slag from a blast furnace, converter, etc., there is an apparatus as shown in FIG.

In Fig. 1, 1 is a tundish, 2 is a granulation target such as a rotating drum, 3 is a fluid collection tank formed from an outer tank 3a and an inner tank 3b, 4 is a fluid collection tank wind box, and 5 is a fluid collection tank. A fluidized collection tank diffuser plate provided at the top of the tank air box 4, 6 a slag powder discharge port provided in front of the fluidized collection tank diffuser plate 5, and 7 directed downward from the slag powder discharge port 6. The installed slag powder discharge pipe,
Reference numeral 8 indicates a wind box installed in the middle of the slag powder discharge pipe 7, 9 indicates a slag powder cutting device, and 13 indicates a fluidized bed formed by blowing up a medium (for example, slag powder with a diameter of 1 mm or less) by gas.

The details of the fluid collection tank diffuser plate 5 will be explained with reference to FIGS. 2 and 3. The plate main body 10 is installed in multiple stages and slopes downward toward the slag particle discharge chamber 6 side, and the upper plate main body 10 and the lower plate main body 10 are installed in a downward direction. A gap 12 is formed between the plate body 10 and the plate body 10, and a spacer 11 is installed in the gap 12 to support the plate body 10.

The molten slag flow flowing out from the tundish 1 falls on the surface of the granulation target 20 coated with or sprayed with a non-wetting substance such as oil or water, collides with it, recoils into slag droplets, and collects the fluid. Scattered into tank 3.

The fluid collection tank 3 contains a medium, and the medium is passed through the wind box 4.
The slag droplets scattered into the fluid collection tank 3 are blown up by the gas blown into the fluid collection tank 3 through the gap 12 of the air diffuser plate 5, forming a fluidized bed 13. The slag droplets are mixed into this fluidized bed 13, and a medium is sprayed onto the surface, and the slag droplets do not adhere to each other, but are cooled and solidified by the medium and gas and become slag powder, which is then diffused by high-speed gas. The slag particles are guided along the slope of the plate 5 toward the slag particle discharge chamber 6.

Gas is blown into the slag powder discharge port 6 through the wind box 8 and the slag powder discharge pipe 7, so that out of the slag powder and the medium led to the slag powder discharge port 6, only the medium is blown by the gas. The slag powder is raised and returned to the fluid collection tank 3, and is discharged to the outside via the slag powder discharge pipe 7 and the slag powder cutting device 9.

However, in the fluidized bed, agglomerates are formed in the fluidized bed due to an increase in the temperature inside the fluidized bed, a decrease in the ratio of fluidized fluidized water in the fluidized bed, and deterioration of the flow condition in the fluidized bed. The slag droplets adhere to each other due to the slag droplets being generated or attached to the wall, and the coarse slag falls into the fluidized bed.These slag slag accumulates in the fluidized bed and is discharged to the slag particle discharge pipe. If this is not done, the slag droplets that scatter and fall through the fluid collection tank 3 may adhere to and grow on the surface of the slag, forming large lumps, which may impede the operation of the apparatus.

In the apparatus shown in FIG. 1, in order to prevent the operation of the apparatus from being obstructed, the diffuser plate 5 is tilted downward toward the slag particle discharge chamber 6, so that even if slag is generated, it can be prevented from becoming large clumps. High-speed gas is ejected from the gap 12 of the diffuser plate 5 into the fluidized bed 13 toward the slag particle discharge chamber 6, and the slag is carried out while being pushed in the slag particle discharge chamber 6 direction. When the slag becomes large, it cannot be transported by gas force.

On the other hand, if you try to transport large slag using gas power,
This not only causes an increase in the blowing power due to the increase in ventilation resistance, a decrease in the temperature of the recovered hot air due to the increase in the amount of air blown, but also increases the scattering of the medium that forms the fluidized bed, making stable operation of the device impossible.

The present invention was developed with the aim of eliminating the above-mentioned drawbacks of conventional equipment. Molten slag is dropped onto a granulation target and collided with it to form slag droplets. A device for forming slag particles by mixing the medium into a fluidized bed on a plate, characterized in that a diffuser tube for blowing gas for fluidizing the medium is rotatably provided on the diffuser plate. be.

Embodiments of the present invention will be described below with reference to the drawings.

A step is attached to the lower end of the slope of the inner wall 3b of the fluid collection tank 3, and a step is provided at a position slightly lower than the lower end of the slope, as in the conventional example shown in FIG.
Flow collection tank diffuser plate 5 that protects from the plate bodies 10 installed in multiple stages, spacers 11 etc. installed in the gaps between the plate bodies 10°10
A wind box 4 for blowing gas into the fluid collection tank 3 is installed at the bottom of the fluid collection tank diffuser plate 5 so as to slope downward toward the slag particle discharge chamber 6. A large number of flow collection tank aeration pipes 14 whose axes extend in a direction perpendicular to the inclination direction of the flow collection tank diffuser plate 5 when seen from a plane are installed at predetermined positions above the collection tank diffuser plate 5 to form a flow collection tank. The fluid collection tank aeration pipes 14 are arranged at required intervals along the air diffuser plate 5, and are fitted into bearings (not shown) attached to the side plates of the fluid collection tank 3. 14 is connected to an appropriate drive device outside the fluid collection tank 3, so that the fluid collection tank aeration pipe 14 can be rotated counterclockwise in FIG.

The details of the fluid collection tank aeration pipe 4 will be explained with reference to FIGS. 5 and 6. The fluid collection tank aeration pipe 14 is made hollow, and a gas supply pipe is connected to one end thereof via a rotary joint. On its outer periphery, long holes 15 are bored at equal pitches in the circumferential direction and at required pitches in the longitudinal direction in a staggered manner, and blades 17 are attached to the long holes 15 through spacers 16, and slits 18 are formed between the spacers 16. will be established.

The blades 17 are used to smoothly send slag grains, etc. to the discharge port 6 side, and also to prevent slag grains, media, agglomerates, etc. from entering the flow collection/diffusion pipe 14.

During granulation, gas is blown into the fluid collection tank 3 from the wind box 4, and the fluid collection tank aeration pipe 14 is rotated in the direction of the arrow in FIG. Gas is blown into the collection tank 3.

Then, the medium in the fluidized collection tank 3 is fluidized by this gas and becomes a uniform fluidized bed, the slag droplets are collected by the fluidized bed, and the fine particles of the collected slag droplets are
The medium passes between the fluid collection tank aeration pipes 14 and falls onto the fluid collection tank aeration plate 5, and the gas causes the slag particles to be discharged through the flow collection tank aeration pipe 14.
transported to the side.

On the other hand, due to some reason, the slag droplets flow into the fluid collection tank 3.
When mutual adhesion occurs in the flow collection tank and the agglomerates grow into slag, the agglomerates are caught on the blades 17 of the fluid collection tank aeration pipe 14 and are mechanically moved onto the aeration pipe 14 as the fluid collection tank aeration pipe 14 rotates. The slag particles are transported to the slag grain discharge chamber 6 side, and the accumulation of slag in the fluid collection tank 3 is completely prevented.

While the slag is conveyed on the fluid collection tank aeration pipe 14, the blade 1
It may be crushed by the rotational force of 7.

Once the slag enters the transportation process in the fluid collection tank aeration pipe 14, it moves, so slag droplets do not adhere to it one after another, and therefore the slag never grows larger than a certain size. .

As a result, accidents such as the lump slag discharged outside the fluid collection tank 3 clogging the cutting device or staying in the flow path in the next process can be prevented.

FIG. 7 shows another example of the fluid collection tank aeration pipe used in the present invention, and is an example in which a porous pipe body is used as the fluid collection tank aeration pipe 14.

In this example, since the gas is rectified while passing through the pores in the tube wall, no spacer or long hole is required.

Note that the flow collection tank diffuser used in the present invention is not limited to the above-mentioned embodiments, and the number of blades, arrangement method, slit structure, etc. can be made arbitrary as necessary, and other gist of the present invention Of course, various changes may be made within the scope of the invention.

Since the fluid collection tank of the present invention has the above-mentioned configuration, even if slag is generated in the fluid collection tank, it can be discharged outside the fluid collection tank before it grows large. Stable continuous operation is possible, and since the slag does not accumulate in the fluid collection tank, there is no need for a device to detect the slag, and equipment costs and operation and maintenance costs are low. It can have a great effect.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the granulation device, Figure 2 is an enlarged explanatory diagram of the diffuser plate of the granulation equipment in Figure 1, Figure 3 is a view taken in the direction of arrow III in Figure 2, and Figure 4 is the book. An explanatory diagram of the fluid collection tank of the invention, Fig. 5 is an enlarged explanatory diagram of the aeration pipe used in the fluid collection tank of the invention, Fig. 6 is a view taken in the VI-VI direction of Fig. 5, and Fig. 7 is a sectional view of another example of the air diffuser. In the figure, 2 is a granulation target, 3 is a fluid collection tank, 5 is a fluid collection tank diffuser plate, 14 is a fluid collection tank aeration pipe, and 17 is a blade.

Claims (1)

[Scope of utility model registration request] In an apparatus in which molten slag is dropped onto a granulation target and collided with it to form slag droplets, the slag droplets are mixed into a fluidized bed of a medium on a fluidized collection tank diffuser plate to form slag powder. A fluid collection tank characterized in that a diffuser tube for blowing gas for fluidizing the medium is rotatably provided.