JPS6033161B2 - Skirt dry sealing device for converter exhaust gas treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a skirt sealing device in a converter exhaust gas treatment device, and in particular solves problems with wet sealing devices and increases the CO concentration of recovered gas to increase its value as a valuable gas. This invention relates to a skirt sealing device that is improved and also enables pressurized operation.

First, the outline of the converter exhaust gas treatment device will be explained.

As shown in FIG. 1, the converter exhaust gas treatment device is configured to introduce high-temperature CO gas generated from the converter 1 into a hood 3 using an induced fan 8, cool it with a cooler 5, and then pass it through dust collectors 6 and 7. The gas holder 101 is removed and recovered as valuable gas. On the other hand, the operation of the converter 1 is as follows: First, the skirt 2 is raised to move the converter 1, and after injecting hot metal into the converter 1, the converter 1 is raised, and the skirt 2 is lowered to move the converter 1. □ and food 3
Seal the gap with skirt 2.

In this state, oxygen is blown into the converter 1 from the oxygen injection lance 4 for refining. During this oxygen injection, gas with low CO concentration generated at the beginning and end of the injection is radiated from the chimney 9,
Only the gas with high CO concentration at the peak of blowing is recovered by one gas holder by switching the damper 11. Next, after completing the refining,
The skirt 2 is raised again, and then the converter 1 is moved to take out the refined steel. In this way, the skirt 2 moves up and down each time the converter 1 is moved, and also prevents the gas generated from the converter from leaking outside and prevents outside air from being sucked into the hood to prevent an explosion. This is an important part that seals off the opening of the converter and the hood in order to prevent danger to the human body and to recover gas with as high a CO concentration as possible.

A conventional skirt sealing device has a structure shown in FIGS. 2 and 3.

That is, as shown in the figure, a water tank 12 is provided on the outer periphery of the skirt 2, and the tip of a seal plate 13 is inserted into the water tank 12, so that the skirt 2 can be moved up and down and its upper part is airtightly sealed. was. Note that 14 is a sealing member provided to protrude from the side surface of the hood 3. In the skirt seal structure of such a structure, if gas is generated from the converter 1 with the skirt 2 sealing the space between the furnace □ and the hood 3 of the converter 1, as shown in Figure 2. The exhaust gas containing dust passes through the gap between the hood 3 and the skirt 2 and fills the seal portion as shown by arrow A. At this time, the dust enters the water tank 12 and settles to the bottom thereof. In this state, when the skirt 2 is raised as shown in FIG. 3, the tip of the seal plate 13 hits the dust settled on the bottom.
There are cases where it becomes impossible to raise the skirt. In particular, the dust contained in the exhaust gas is heavy, and it is very difficult to remove it. As a result, the converter cannot be moved or the skirt cannot be raised vertically, resulting in the skirt and hood coming into contact and causing damage. Secondly, in conventional operation, it is extremely difficult to control the pressure inside the hood because the amount of gas generated from the converter fluctuates drastically and the seal part of the skirt is a water seal as mentioned above. By opening the gap between the □ and the skirt by 100 to 15 degrees, the pressure inside the hood could only be controlled to about 12 degrees of water.

In other words, the pressure inside the hood (furnace pressure) is controlled by the yield of the induced blower, so the follow-up ability is not quick. For example, if the amount of gas generated suddenly increases, the pressure inside the hood will The pressure increases rapidly, and the water in the water seal section is forced out, impairing the function of the water seal and at the same time, the function of the exhaust gas treatment device.

In order to prevent this, a gap is provided between the converter furnace □ and the skirt to temporarily release the exhaust gas to the outside. Conversely, if the amount of exhaust gas suddenly decreases, the pressure inside the hood will become negative and water from the water seal will be sucked in.

In this case, outside air is sucked into the hood through the gap between the converter furnace □ and the skirt, and CO gas is combusted.
This lowers the O concentration and its value as a valuable gas. As described above, the conventional skirt sealing device had the disadvantage of reducing its value as a valuable gas.

Furthermore, in order to save energy, the current trend is to pressurize the inside of the exhaust gas treatment equipment by several hundred water columns (the pressure of the oxygen being blown), eliminate the induced blower, and reduce the power consumption to drive it. However, the conventional skirt seal device has a disadvantage in that it cannot cope with this pressurized operation for the above-mentioned reasons. The present invention aims to solve all of the above-mentioned drawbacks and to provide a skirt seal device that can sufficiently deal with energy saving. That is, the present invention
Instead of a conventional water seal, a seal cloth is used to enable the skirt to move up and down to form a seal. One end of the seal cloth is fixed to the upper edge of the skirt, and the pond end of the seal cloth is attached to the side wall of the hood. The upper side of the skirt is sealed by fixing it to a protruding seal member, and a protector is provided on the outside of the seal cloth to eliminate dust troubles and provide pressure resistance with the seal cloth and protector, making it possible to connect the skirt and the furnace mouth. It is characterized by making the gap as narrow as possible to prevent air from entering from the outside and recovering gas with a high CO concentration. The details will be explained below using examples shown in the drawings. FIGS. 4 and 5 show this embodiment. In the figure, one end of the sealing cloth 15 is fixed to the upper edge of the skirt 2,
The other end of this sealing cloth 15 is fixed to a sealing member 14 extending from the side surface of the hood 3 to seal the upper side of the hood 2. This sealing cloth 15 is a stretchable heat-resistant cloth, and for example, silicone and synthetic mica are sprayed on a blended cloth of carbon fiber and glass fiber to make it into a non-breathable cloth, and this cloth is further made of glass fiber and rock wool. It can be wrapped in a blended fabric to create a fabric that is non-breathable, has excellent heat resistance, and is stretchable. In some cases, this cloth is used in several layers. Reference numeral 16 denotes a seal cloth protector, which protects the seal cloth 15 when the skirt 2 is lowered.

Alternatively, the seal cloth 15 is protected from obstacles from the outside. Note that 17 is a fireproof heat insulating material. In this embodiment configured as described above, first, as shown in FIG. 4, the skirt 2 is lowered, and the opening of the converter 1 and the skirt 2 are
Make the gap between the two as narrow as possible. In this state, the sealing cloth 15 hangs down along the inside of the sealing cloth protector 16, and the upper part of the skirt 2 is sealed by the sealing member 14 and the sealing cloth 15. Next, oxygen is blown into the converter 1 to start blowing, and the generated gas is directed into the hood 3 by arrow B.
It's like being attracted to something.

A portion of this gas enters the upper part of the skirt 2 along with the duct as shown by arrow A and fills the area. At this time, the duct is sealed with cloth 1
It falls down along the slope of 5. Further, even if the pressure inside the hood 3 suddenly changes, airtightness is maintained due to the strength of the seal cloth 15 itself and the seal cloth protector 16. Similarly, even if the converter exhaust gas treatment equipment is operated at a pressure of several hundreds of columns of water, the seal cloth is held by the protector 16 and can withstand the pressure. Next, when the blowing is completed and the skirt 2 is raised, as shown in FIG. 5, the sealing cloth 15 is lifted by the skirt 2 and does not interfere with the raising and lowering of the skirt 2. As detailed above, according to the present invention, since the upper part of the skirt is sealed with a sealing cloth, there is no dust problem as in the conventional case, and the skirt can be easily moved up and down, eliminating damage to the hood or skirt. By reducing the gap between the converter and the converter opening to reduce the intrusion of outside air, CO
Highly concentrated gas can be recovered, increasing its value as a valuable gas, and it also enables pressurized operation, reducing the power consumption of the induced blower, and at the same time, pressurizing it completely eliminates the intrusion of outside air. The effects are great, such as the ability to further improve the value of the gas as a valuable gas.

[Brief explanation of the drawing]

Fig. 1 is an explanatory drawing shown to explain the entire converter exhaust gas treatment equipment, Figs. 2 and 3 are conventional examples, Fig. 2 shows the state in which the skirt is lowered, and Fig. 3 shows the state in which the skirt is lowered. Figures 4 and 5 show this example, Figure 4 shows the skirt when it is lowered, and Figure 5 shows the skirt when it is raised. It is a figure showing each state. 1...Converter, 2...Skirt, 3...
...Hood, 14... Seal member, 15...
- Seal cloth, 16...Seal cloth protector. Figure 2 Figure 1 Figure 5 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a converter exhaust gas treatment device in which a hood is provided above the furnace mouth of the converter, and a skirt that can move vertically forms a seal between the furnace mouth and the hood, one end of the sealing cloth is attached to the upper edge of the skirt. The other end of the seal cloth is fixed to a seal member provided overhanging the side surface of the hood, and a protector is provided outside and along the seal cloth to airtight the upper part of the skirt. A dry sealing device for a skirt in a converter exhaust gas treatment device, which is characterized by: