JPH0645837Y2 - Water granulation equipment stack - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to the discharge of water granulation equipment provided with an opening / closing plate that functions as a valve that dissipates the air to the outside when the water granulation steam is excessive. Regarding cylinders.

[Conventional technology]

Obtained during gun iron production, the molten slag is used for various uses depending on the processing treatment, but among them, spraying pressure water on the molten slag, atomizing and cooling, the obtained granulated slag is It is widely used as a material for blast furnace cement.

Equipment for spraying pressurized water to the molten slag, atomizing and cooling is generally called water granulation equipment, but for high temperature molten slag, a large amount of water is jetted by a blowing device, so at that time Currently, the generated steam is naturally ventilated and exhausted by an exhaust pipe provided in the steam generation part. Therefore, since it is not forced exhaust of the fan etc., if the inflow of molten slag temporarily increases, the amount of steam generated will increase and exceed the exhaust capacity of the exhaust stack, so steam will flow from the opening of the blow box. There was a danger of blowing out and injuring workers around.

In order to solve such a problem, some methods and apparatuses have been proposed in recent years. For example, Japanese Examined Japanese Patent Publication Sho 63-264
As shown in FIG. 5, Japanese Patent Publication No. 9 discloses a duct 21 including an exhaust rising pipe 21a, an exhaust falling pipe 21b, and a re-raising pipe 21c which are connected to each other via curved pipes at the upper part of a water tank 20 to provide the exhaust gas. Disclosed is a device in which a water spray nozzle 22 provided inside the downcomer pipe 21b is provided downward to enhance a draft force by an ejector effect by water spray and forcibly exhaust air.
In addition to the effects described above, this device has a nozzle for watering.
The water droplets ejected from 22 have the effect of capturing water vapor and neutralizing the sulfurous acid gas in water vapor with the chemical liquid mixed in the sprinkling water. In addition, JP-A-58-193
Japanese Patent Laid-Open No. 019 discloses a device in which the exhaust capacity can be adjusted by making the discharge opening area of the exhaust stack variable.

[Problems to be solved by the device]

However, in the invention device described in JP-B-63-2649, basically, the main purpose is to neutralize and purify the sulfurous acid gas in the water vapor, and incidentally exhaust gas by the ejector effect by water spray. Since the draft force is applied to shorten the height of the exhaust stack, the draft force associated with the water spray is not so large.Therefore, when a large amount of steam is generated, steam that cannot be processed is blown out. The phenomenon of blowing out from the opening of the box can be seen. Further, in the invention described in JP-A-58-193019, there is a problem in that it is necessary to set the diameter of the exhaust pipe to a diameter that matches the maximum processing exhaust amount, and an extra equipment cost is required.

Therefore, in order to ensure the safety of the worker, the present invention ensures that even if steam exceeding the exhaust capacity of the exhaust stack is generated, the steam is completely blown out from the opening of the blowing box part at an extra facility cost. An object of the present invention is to provide a water granulation equipment exhaust stack that can be completely prevented without being put on.

[Means for Solving the Problems]

In order to solve the above problems, the present invention comprises an opening formed in the wall surface of the middle portion of the exhaust pipe extending in the height direction, and an opening / closing plate that opens and closes the opening, and the opening / closing plate is the amount of generated steam. Is held on the wall surface of the exhaust pipe so as to automatically open and close according to the pressure variation in the height position where the opening and closing plate is arranged in the exhaust pipe, surrounding the opening and the opening and closing plate,
The upper end opening is separated from the outer wall of the exhaust stack, and the bottom is hollowed out to provide a bowl-shaped diffuser whose opening is connected to the outer wall of the exhaust stack.

[Action]

The present invention is provided with an opening on the wall surface of the middle part of the water granulation equipment exhaust pipe, and an opening / closing plate for opening and closing the opening. Therefore, when the amount of inflow of molten slag increases temporarily and a large amount of steam is generated, and the exhaust capacity of the exhaust stack is exceeded, the pressure in the exhaust stack increases due to the steam, and the pressure causes the opening / closing plate to open. Since the opening is opened, the generated water vapor is released to the atmosphere.

On the other hand, if the water vapor generated by water granulation is less than the processing capacity of the exhaust stack, the stack internal pressure at the height of the opening / closing plate will be slightly negative compared to the outside air due to the stack effect, so the outside air The opening and closing plate is closed in an attempt to flow in. for that reason,
All generated steam is discharged from the discharge port at the upper end of the exhaust stack.

Further, in the present invention, a bowl-shaped diffuser surrounding the opening and the opening and closing plate, the upper end opening is separated from the outer wall of the exhaust stack, the bottom is hollowed out, and the opening is connected to the outer wall of the exhaust stack. It is provided. Here, the opening and closing plate is held under a delicate pressure balance so that it automatically opens and closes in accordance with the pressure fluctuation in the height position where the opening and closing plate is arranged in the exhaust pipe depending on the amount of generated steam. , There is a risk that the wind will open and close the opening and closing plate. So, by the diffuser,
By blocking the collision of the wind with the opening / closing plate, the influence of the wind can be prevented. Further, the diffuser can also be used as a guide that diffuses water vapor above the atmosphere when water vapor is blown out.

[Specific configuration of device]

 The specific configuration of the present invention will be described in detail.

First, the arrangement position of the valve device 1 according to the present invention will be described with reference to FIG.

The molten slag discharged from the blast furnace 10 passes through the molten slag 11 and is guided to the water granulation equipment. Cooling water is blown to the molten slag by the blow box 12, and the steam generated here is discharged from the upper end opening to the atmosphere by the exhaust pipe 6.

As shown in the figure, the valve device 1 according to the present invention is provided in the middle part of the water discharge device exhaust pipe 6. The height position is not particularly limited, but is preferably higher from the viewpoint of pollution prevention and corrosion protection of other equipment, and the valve device 1 is opened / closed by increasing the in-cylinder pressure due to excessive steam generation. Considering this, the lower the effect, the stronger the effect, so a position where both effects are well balanced, for example, 30m from the ground
A height of about 50 m is preferable.

Next, a specific example of the valve device 1 according to the present invention will be described in detail with reference to FIGS. 1 and 2.

That is, a plurality of water vapor circulation openings are formed at intervals in the circumferential direction at, for example, the above-mentioned height position of the exhaust pipe 6, and each of these openings is provided with a ventilation plate 2 which is breathable. The open / close plate 3 is located outside of 2 and the exhaust pipe 6
Is held by the wall surface of the wall so that it can be opened and closed with respect to the opening. The material of the opening / closing plate 3 is selected because it is excellent in corrosion resistance and weather resistance because it is placed in a bad environment where it is exposed to wind and rain in a humid condition due to exhaust steam. Further, as will be described later, the operation of the opening / closing plate 3 is opened / closed by a slight force due to the pressure difference between the inside of the cylinder and the outside air, and therefore an extremely lightweight one is desired. As for the rigidity of the opening / closing plate 3, naturally, it is not preferable that the opening / closing plate 3 is easily rolled up or deformed.
Is circular, it is preferable that the opening / closing plate 3 be flexible to some extent so as to be in close contact with the exhaust pipe 6 along its shape when the valve is closed. Therefore, as the material satisfying the above conditions, for example, a rubber-based resin material or a material such as stainless steel foil is selected.

An example of a mounting structure of the opening / closing plate 3 to the exhaust pipe 6 will be described with reference to FIG. In this example, the open / close plate 3 is fixed to the wall surface of the exhaust pipe 6 only by the open / close plate mounting bracket 4, for example, a bottle nut. Also, the ventilation plate 2
Is fixed to the exhaust pipe 6 by a bottle nut. Further, the angle α formed by the axis of the exhaust stack 6 and the opening / closing plate 3
Is preferably a small angle, for example about -10 ° to + 10 °. This is because the operation of the opening / closing plate 3 is performed by a slight force due to the pressure difference between the inside of the cylinder and the outside air.

Although the opening / closing plate 3 may be provided directly outside the water vapor passage opening provided on the wall surface of the exhaust pipe 6, the ventilation plate 2 having ventilation is provided at the opening.
Is desirable. The ventilation plate 2 is provided so that the opening / closing plate 3 is attracted to the opening by the negative pressure in the exhaust pipe 6, and the opening / closing plate 3 is not sucked into the exhaust pipe 6. Wire mesh or perforated plate is selected.

An atmosphere diffusion pipe 5 that surrounds the opening / closing plate 3 is attached around the opening / closing plate 3 so as to radially project from a position below the opening / closing plate 3 of the exhaust pipe 6 and extend further upward. As a result, it is possible to prevent the opening / closing plate 3 from opening / closing due to the influence of the wind, and at the same time, to open the opening / closing plate 3 to dissipate the water vapor released above the atmosphere. Further, it is desirable to provide a water drain hole 30 at the bottom of the atmospheric diffusion pipe 5.

(Example) The present invention will be described in more detail with reference to an example.

The height of the exhaust port is set to GL + 100m, and the diameter is reduced to 4000φ below the exhaust pipe 6 and 2500φ above, and the valve device 1 of the present invention is provided in the 4000φ portion near GL + 30m with respect to the exhaust pipe 5. Was given.

Sixteen opening / closing plates 3 were provided at equal intervals in the circumferential direction of the exhaust pipe 6. The material of the opening / closing plate 3 was silicon rubber, and the thickness was 1 mm. A bottle nut (M10) made of SUS304 was used as the opening / closing plate mounting member 4, and the opening / closing plate 3 was directly attached to the exhaust pipe 6 as shown in FIG. The attachment state of the opening / closing plate 3 to the exhaust pipe 6 depends on the angle α formed by the axis of the exhaust pipe 6 and the opening / closing plate 3.
Were mounted at 5 °. As the ventilation plate 2, a wire net made of SUS304 and having a mesh of 3 mm was adopted, and was attached by a bottle nut as shown in FIG.

On the other hand, the material of the atmospheric diffusion tube 5 was also SUS304 and the thickness thereof was 5 mm.

As a result of performing the operation with the exhaust pipe 6 according to the present invention, as a result, when the molten slag amount was 5 t / min or more, it was observed that steam was blown out from the opening such as the suction box part. At 5 t / min or more, the opening / closing plate 3 was opened, and no steam was seen to be blown out from the openings such as the suction box part, so that the work could be performed safely. When the amount of molten slag was less than 5 t / min, the opening / closing plate 3 was closed and all water vapor was discharged from the exhaust port.

On the other hand, in the exhaust pipe of the present invention, the upper part of the exhaust pipe valve device has a duct diameter during normal operation, and the lower part of the exhaust pipe valve device has a large diameter duct, so that steam is exhausted without incurring extra facility costs. be able to.

[Effect of device]

As described above in detail, the following effects can be achieved by the present invention.

Even if the inflow of molten slag increases temporarily in the water granulation equipment, and steam that exceeds the exhaust capacity of the exhaust stack is generated, by installing the valve device of the present invention in the middle part of the exhaust stack, excess steam is forcibly exhausted. can do. Therefore, it is possible to completely prevent the steam from being blown out from the opening of the blow box, and the surrounding workers can safely work.

In addition, the opening and closing plate is held under a delicate pressure balance so that it automatically opens and closes according to the pressure fluctuation in the exhaust stack due to the amount of generated steam, where the wind opens and closes the opening and closing plate. By providing a diffuser, it is possible to prevent the influence of wind by blocking the collision of the wind with the opening / closing plate. Further, the diffuser can also be used as a guide that diffuses water vapor above the atmosphere when water vapor is blown out.

In addition, the exhaust stack of the present invention is very economical because it is constructed by simply providing the valve device in the existing exhaust stack without incurring extra facility cost.

[Brief description of drawings]

1 and 2 are views for explaining a concrete example of the present invention,
FIG. 3 is a diagram for explaining an example of the mounting structure of the opening / closing plate, FIG. 4 is a diagram for explaining the arrangement position of the valve device according to the present invention,
FIG. 5 is a schematic diagram showing a conventional forced exhaust method according to Japanese Patent Publication No. 63-2649. 1 ... Exhaust stack valve device, 2 ... Ventilation plate 3 ... Open / close plate, 4 ... Open / close valve mounting bracket 5 ... Atmosphere vent pipe, 6 ... Exhaust stack 10 ... Blast furnace, 11 ... Molten gutter 12 …… Blowing box part, 30 …… Drainage hole

Claims (1)

[Scope of utility model registration request] 1. An exhaust pipe extending in the height direction, comprising an opening formed in a wall surface at an intermediate portion of the exhaust pipe, and an opening / closing plate closing the opening so as to be openable / closable. It is held on the wall surface of the exhaust pipe so as to automatically close and open according to the pressure fluctuation in the height position of the opening / closing plate inside, and surrounds the opening and the opening / closing plate, and the upper end opening is separated from the outer wall of the exhaust pipe. An exhaust stack for water granulation equipment, characterized in that a bowl-shaped diffuser whose bottom is hollowed out and whose opening is connected to the outer wall of the stack is provided.