JPH0686616B2 - Lance hole sealing device for pressurized converter exhaust gas treatment equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lance hole sealing device for a pressurized converter exhaust gas treatment device.

[Conventional technology]

During the operation of the converter, in order to smelt the hot metal introduced into the converter, an oxygen injection lance is inserted into the converter through a lance hole provided in the upper hood of the converter exhaust gas treatment equipment, and pure oxygen is injected. I'm out.

In this blowing, the oxygen blown from the oxygen blowing lance reacts with the carbon in the hot metal, and a large amount of high-temperature CO gas is generated. If this CO gas leaks to the outside, it causes monoxide poisoning, so it is not only very dangerous, but it also has the risk of reacting with the outside air and causing rapid combustion. Therefore, a skirt that can move up and down is provided between the converter furnace opening and the lower hood to prevent external leakage of CO gas and invasion of outside air into the skirt. The high-temperature CO gas generated by blowing leaks to the outside from the lance hole for inserting and removing the oxygen injection lance in addition to the above skirt, and the outside air enters the upper hood, so the lance hole is also sealed. is important.

As shown in FIG. 3, the conventional lance hole sealing device has a cone shape so that the labyrinth-like seal portion 42 is formed on the inner surface of the lance insertion hole 41 and is fitted into the upper end of a lance hole 43 formed in a funnel shape. A formed lance cone 44, a seal box 45 integrally provided on the upper surface of the lance cone 44, and an expandable and contractible seal member 47 having a lower end fixed to the upper surface of the seal box 45 and an upper end fixed to a lance 46, The seal box 45 and the lance cone 44 are provided with an inert gas supply pipe 48 which is provided so as to communicate with the seal box 45. A jet hole 50 for jetting the inert gas downward to a corner portion of the lance insertion hole 49 of the seal box 45. On the other hand, an inert gas ejection hole 51 is provided on the joint surface of the labyrinth-like seal portion 42 of the lance cone 44 and the lance hole 43, and the joint portion of the lance insertion portion and the lance hole 43 is sealed with an inert gas. Is a feature (See Japanese Patent Publication No. 62-20257).

[Problems to be Solved by the Invention]

By the way, in the recent operation of a converter, a so-called pressure operation in which the gas pressure in the furnace is operated at a pressure higher than the normal pressure is often performed due to the advantage of metallurgy. There is a natural limit to the internal gas pressure,
The amount of inert gas (N ₂ gas) used at that time is also enormous.

In view of the above, the present invention provides a pressurized converter exhaust gas treatment in which a lance hole can be completely sealed during the blowing of oxygen into the hot metal in the converter by the oxygen blowing lance in the pressure operation of the converter. The present invention seeks to provide a lance hole sealing device for the device.

[Means for Solving the Problems]

The lance hole sealing device of the pressurized converter exhaust gas treatment device of the present invention for solving the above problem is provided at the upper end of the water cooling jacket type lance hole, and the inner peripheral surface is inclined downward,
It has a gas ejection hole on its inner peripheral surface and a hollow gas ejection ring having a gas introduction port on its outer peripheral surface, and an inclined lower outer peripheral surface that fits on the inclined inner peripheral surface of the gas ejection ring, A labyrinth seal part is formed in the central lance insertion hole,
The lower outer peripheral surface has a gas introduction hole communicating with the gas ejection hole of the inclined inner peripheral surface of the gas ejection ring, the lance insertion hole has a gas ejection hole, and the oxygen injection lance inserted into the lance insertion hole. A lance cone pulled up by a locking ring provided on the outer periphery of the, and fixed to the outer periphery of the gas ejection ring,
A ring-shaped sealing mechanism receiver, in which a flexible hollow ring-shaped sealing material whose cross-sectional diameter changes due to the inflow and outflow of a fluid is embedded in the upper surface inclined toward the outside and protruding, and a circle is formed on the upper outer periphery of the oxygen blowing lance. The plate is fixed, and a plurality of metal bellows are continuously hung vertically on the outer peripheral portion of the disc.Each metal bellows is attached to a guide rod, which is vertically suspended on the outer peripheral edge of the disc, through an annular plate. Supported by the annular plate at the lowermost end of the metal bellows, the sealing mechanism being provided on the outer periphery of the annular metal member placed on the upper surface of the sealing mechanism receiver, and the lower side of the annular recess provided on the outer periphery of the sealing mechanism receiver. A clutch door, which is movably fitted and supported, and whose upper side of the tooth shape is engaged with a tooth-shaped projection provided on the outer periphery of the annular metal member of the sealing mechanism, has a U-shaped cross section.

[Action]

The lance hole sealing device of the pressurizing type converter exhaust gas treatment apparatus configured as described above is used for refining the hot metal charged into the converter during pressurizing operation of the converter. When the oxygen blowing lance is inserted downwardly into the lance hole provided in the upper hood, the lance cone pulled up by the locking ring on the outer circumference of the oxygen blowing lance is lowered, and the inclined lower outer peripheral surface of the lance cone is lowered. When the hollow gas injection ring provided at the upper end of the hole is closely fitted to the inclined inner peripheral surface and the oxygen injection lance is further lowered and the tip is inserted into the converter, the outer periphery of the upper part of the oxygen injection lance The annular metal member of the suspended seal mechanism is placed on the seal mechanism receiver on the outer periphery of the gas ejection ring. At this time, since the tooth-shaped protrusion provided on the outer periphery of the annular metal piece is located below the tooth-shaped protrusion of the clutch door having a U-shaped cross section which is rotatably supported in the annular recess on the outer periphery of the seal mechanism receiver, The clutch door is rotated, and the upper side of the tooth shape is engaged with the tooth-shaped protrusion to fix the annular metal member. Next, the fluid is flown into the flexible hollow annular seal material that is embedded and projected on the inclined upper surface of the seal mechanism receiver,
The cross-sectional diameter is increased by the pressure of the fluid, and the cross-sectional diameter of the ring-shaped metal object on the side of the seal mechanism is closely adhered to seal between the seal mechanism receiver and the seal mechanism. Then, an inert gas is introduced into the gas ejection ring at the upper end of the lance hole from the gas introduction port, and the lance cone is introduced from the gas ejection hole on the inclined inner peripheral surface of the gas ejection ring through the gas introduction hole of the lance cone communicating with this. Inert gas is spouted inside. Then, the inert gas ejected into the lance course is ejected from a large number of gas ejection holes provided in the lance insertion hole to the labyrinth-like seal portion to seal between the oxygen injection lance and the labyrinth-like seal portion. At the same time, the metal bellows is filled with the ejected inert gas and becomes the same pressure as the gas pressure in the furnace.

Thus, during pressure operation of the converter, even if the gas pressure in the furnace acts on the lance hole, the lance insertion hole of the lance cone and the oxygen injection lance are normally completely sealed, so the converter exhaust gas is sealed by the sealing mechanism. There is no leakage to the side. Even if the lance cone floats up due to excessive gas pressure and the converter gas leaks to the seal mechanism side, there is a gap between the seal mechanism receiver on the outer periphery of the gas ejection ring at the upper end of the lance hole and the annular metal object at the lower end of the seal mechanism. Since the space is sealed by a flexible hollow annular seal material, it does not leak to the outside, and since both are locked by the clutch door, the seal mechanism does not float up by the converter gas. Therefore, the sealing of the lance hole in the pressure operation of the converter becomes reliable and safe.

〔Example〕

An embodiment of a lance hole sealing device for a pressurized converter exhaust gas treatment apparatus according to the present invention will be described with reference to the drawing. In FIG. 1, 1 is a converter, 2 is a pressurized converter exhaust gas treatment apparatus, and an upper portion thereof. A lance hole 4 is provided in the middle of the hood 3, and an oxygen blowing lance 5 is vertically movable. As shown in FIG. 2, the lance hole 4 is provided with a cooling water inflow pipe 6 on the outer side of the upper end on one side, a jacket 7 on the outer periphery, and a cooling water outflow pipe 8 on the outer side of the upper end on the other side. Reference numeral 9 is a heat insulating material on the outer peripheral side of the jacket 7. At the upper end of the lance hole 4, the inner peripheral surface is inclined downward and has a gas ejection hole 10 on the inner peripheral surface,
Hollow gas ejection ring 12 having a gas inlet 11 on the outer peripheral surface
Is provided. A lance cone 13 having a slanted lower outer peripheral surface corresponding to the slanted inner peripheral surface of the hollow gas ejection ring 12 is fitted.
The lance course 13 is provided with a lance insertion hole 14 at the center through which the oxygen blowing lance 5 is inserted.
A labyrinth-like seal portion 15 is formed on the portion 14. Further, a gas introduction hole 16 communicating with the gas ejection hole 10 of the gas ejection ring 12 is formed on the lower outer peripheral surface of the lance cone 13, and a large number of gas ejection holes 17 are provided in the lance insertion hole 14. There is. The lance cone 13 is a locking ring 18 provided on the outer periphery of the oxygen blowing lance 5 inserted into the lance insertion hole 14.
At this time, when the oxygen blowing lance 5 rises, it is pulled up. An annular seal mechanism receiver 19 is fixed to the outer periphery of the gas ejection ring 12, and the annular seal mechanism receiver 19 is fixed.
A flexible hollow ring-shaped seal material 20 whose cross-sectional diameter changes due to the inflow and outflow of a fluid such as water is embedded and projected on the upper surface inclined toward the outside of 19. Reference numeral 21 is a passage through which a fluid flows in and out of the hollow annular seal member 20, and a hose 22 is connected to the passage 21. 23 is a sealing mechanism provided on the outer circumference of the oxygen blowing lance 5, and this sealing mechanism 23 is a disk 24 fixed concentrically on the upper outer circumference of the oxygen blowing lance 5,
A plurality of metal bellows 25 suspended vertically from the outer peripheral portion of the disk 24, and the metal bellows 25 are hung vertically on the outer peripheral edge of the disk 24 supported via an annular plate 26. It comprises a guide rod 27 and an annular metal member 28 provided on the annular plate 26 at the lowermost end of the metal bellows 25 and placed on the upper surface of the seal mechanism receiver 19. The lower surface of the annular metal fitting 28 is matched with the shape of the upper surface of the sealing mechanism receiver 19.
Reference numeral 29 denotes an annular clutch door having a U-shaped cross section, the lower side 30 of which is rotatably fitted and supported in an annular recess 31 provided on the outer periphery of the sealing mechanism receiver 19, and the upper side 32 is formed in a tooth shape. The upper side 32 of the tooth shape is adapted to engage with the lower side of the tooth-shaped projection 33 provided on the outer periphery of the annular metal member 28 of the sealing mechanism 23.

The operation of the lance hole sealing device of the pressurized converter exhaust gas treatment apparatus of the embodiment thus configured will be described. First
During the pressure operation of the converter 1 shown in the figure, oxygen is blown into the lance hole 4 provided in the upper hood 3 of the pressure converter exhaust gas treatment device 2 in order to smelt the hot metal charged into the converter 1. Lance 5
Is lowered, the lance cone 13 pulled up by the locking ring 18 on the outer periphery of the oxygen blowing lance 5 is lowered, and the inclined lower outer peripheral surface thereof is a hollow gas provided at the upper end of the lance hole 4. When the oxygen injection lance 5 is closely fitted to the inclined inner peripheral surface of the jet ring 12, the oxygen injection lance 5 is further lowered and its tip is immersed in the hot metal in the converter 1, the oxygen injection lance 5
The annular metal fitting 28 at the lower end of the seal mechanism 23 suspended from the outer periphery of the upper part of the seal mechanism receiver 19 on the outer periphery of the gas ejection ring 12 is
It is mounted on the upper side 32 of the tooth shape of the clutch door 29 which is rotatably supported on the outer periphery of the ring door.
Align the groove of the upper side 32 of the tooth shape with the tooth-shaped projection 33 on the outer periphery of 28,
The tooth-shaped projection 33 is lowered to the lower side of the tooth-shaped upper side 32 through the groove, and the annular metal piece 28 is placed on the seal mechanism receiver 19. Then, the clutch door 29 is rotated, and the upper side 32 of the tooth shape is changed to the tooth-shaped protrusion 33.
To fix the annular hardware 28. Next, receive the sealing mechanism
In the present example, a fluid flows into the flexible hollow annular seal member 20 that is embedded in the inclined upper surface of the sloping upper surface 20 and the cross-sectional diameter is increased by the pressure of the water. Ring hardware 28
It closely contacts the lower surface of the seal mechanism and seals between the seal mechanism receiver 19 and the seal mechanism 23. Then, N ₂ gas was introduced into the gas ejection ring 12 at the upper end of the lance hole 4 from the gas introduction port 11, and the lance cone 13 communicating with the gas ejection hole 10 on the inclined inner peripheral surface of the gas ejection ring 12 was connected. N ₂ gas is ejected into the lance cone 13 through the gas introduction hole 16. And Lance Cone 13
The N ₂ gas ejected inside is ejected to the labyrinth-like seal portion 15 through a large number of gas ejection holes 17 provided in the lance insertion hole 14 to seal between the oxygen injection lance 5 and the labyrinth-like seal portion 15. . At the same time, the N ₂ gas fills the metal bellows 25, and the pressure inside the metal bellows 25 becomes equal to the gas pressure inside the furnace.

Thus, during the pressure operation of the converter 1, even if the gas pressure in the converter 1 acts on the lance hole 4, the lance insertion hole of the lance cone 13 is formed.
Since the 14 and the oxygen blowing lance 5 are normally completely sealed, the converter exhaust gas does not leak to the sealing mechanism 23 side. If the gas pressure in the converter 1 is too large, the lance cone 13 rises and the metal bellows 25 on the sealing mechanism 23 side
Even if the converter gas leaks into the inside, a flexible hollow annular seal is provided between the seal mechanism receiver 19 on the outer periphery of the gas ejection ring 12 at the upper end of the lance hole 4 and the annular metal member 28 at the lower end of the seal mechanism 23. Material
Since it is sealed by 20, it does not leak outside, and since the seal mechanism receiver 19 and the seal mechanism 23 are locked by the clutch door 29, the seal mechanism 23 does not float up due to the pressure of the converter gas. . Therefore,
The sealing of the lance hole 4 in the pressurizing operation of the converter 1 is reliable and safe.

When the refining is completed and the molten steel in the converter 1 is tapped, the inflow of water into the hollow annular seal member 20 is stopped and the lance hole is drawn in order to pull up the oxygen injection lance 5 from the inside of the converter 1. The supply of N ₂ gas into the gas ejection ring 12 at the upper end of 4 is stopped,
Stop ejection of N ₂ gas to the lance cone 13, to stop the ejection of the N ₂ gas to the lance insertion hole 14. Then, the clutch door 29 is rotated to align the groove of the tooth-shaped upper side 32 with the tooth-shaped protrusion 33 on the outer periphery of the annular metal member 28, and then the oxygen blowing lance 5 is raised so as to be integrated with the oxygen blowing lance 5. When the sealing mechanism 23 is lifted up, the tooth-shaped projection 33 on the outer periphery of the annular metal piece 28 at the lower end thereof is
Rises through the groove of the tooth-shaped upper side 32, the space between the seal mechanism 23 and the seal mechanism receiver 19 is released, and when the oxygen blowing lance 5 is further raised, the locking ring 18 on the outer periphery of the oxygen blowing lance 5 is released. At, the lance cone 13 is pulled up, and is disengaged from the inclined inner peripheral surface of the gas ejection ring 12 at the upper end of the lance hole 4, and the lance hole 4 is released.

〔The invention's effect〕

As can be seen from the above description, according to the lance hole sealing device of the present invention, in the pressurizing operation of the converter, the lance hole is sealed while oxygen is being blown into the hot metal in the converter by the oxygen blowing lance. Adhesion between the lance cone and the gas injection ring, ejection of an inert gas between the labyrinth-like seal part of the lance insertion hole of the lance cone and the oxygen injection lance, and the sealing mechanism receiver around the gas injection ring and the oxygen injection lance. Sealing by a fluid flow into a flexible hollow annular sealing material whose cross-sectional diameter between the lower end of the sealing mechanism suspended from the outer periphery and the annular metal object changes, and a clutch door between the sealing mechanism receiver and the annular metal object. Since the lance hole is completely sealed by the lock or the like, even if the high gas pressure in the converter acts, the converter exhaust gas does not leak to the outside, which is safe.

[Brief description of drawings]

FIG. 1 is a schematic view of a pressurized converter exhaust gas treatment device, and FIG. 2 is a longitudinal sectional view showing an embodiment of a lance hole sealing device of the present invention in the pressurized converter exhaust gas treatment device. FIG. 6 is a vertical sectional view showing a lance hole sealing device of a conventional converter exhaust gas treatment device. 1 ... Converter, 2 ... Pressurized converter Exhaust gas treatment device 4 ... Lance hole, 5 ... Oxygen blowing lance 10 ... Gas ejection hole, 11 ... Gas inlet 12 ... Gas ejection ring, 13 ...... Lance cone 14 ...... Lance insertion hole, 15 …… Ravi ring seal part 16 …… Gas introduction hole, 17 …… Gas ejection hole 18 …… Locking ring, 19 …… Seal mechanism support 20 …… Hollow ring Sealing material 21 …… Fluid inflow / outflow passage, 23 …… Sealing mechanism 24 …… Disc, 25 …… Metal bellows 26 …… Annular plate, 27 …… Guide rod 28 …… Annular metal object, 29 …… Clutch door 30 ...... Lower side, 31 ...... Annular recess 32 ...... Top side of tooth shape, 33 ...... Tooth shape protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsutomu Kambayashi 2-4-25 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries Ltd. Tokyo Design Office

Claims (1)

[Claims] 1. A pressure-type converter exhaust gas treatment apparatus is provided at an upper end of a water-cooling jacket type lance hole, an inner peripheral surface of which is inclined downward, a gas ejection hole is formed on the inner peripheral surface, and an outer peripheral surface is formed. A hollow gas ejection ring having a gas introduction port, and a slanted lower outer peripheral surface that fits into the slanted inner peripheral surface of the gas ejection ring, and a labyrinth-like seal portion is formed in a central lance insertion hole. The outer peripheral surface has a gas introduction hole communicating with the gas ejection hole of the inclined inner peripheral surface of the gas ejection ring, the lance insertion hole has a large number of gas ejection holes, and the oxygen blown through the lance insertion hole A lance cone that is pulled up by a locking ring provided on the outer periphery of the lance, and a flexible hollow that is fixed to the outer periphery of the gas injection ring and has a cross-sectional diameter that changes due to the inflow and outflow of a fluid on the upper surface inclined toward the outside. Ring-shaped sealing material is embedded to project A ring-shaped seal mechanism receiver and a disk is fixed to the outer periphery of the upper part of the oxygen injection lance, and a plurality of metal bellows are continuously hung vertically to the outer peripheral part of the disk. The guide rods are installed at equal intervals on the outer peripheral edge of the plate and are supported via an annular plate.
The lower end of the metal bellows has an annular plate with an annular metal object placed on the upper surface of the seal mechanism receiver, and the lower end is rotatably fitted and supported in an annular recess provided on the outer periphery of the seal mechanism receiver in the previous period. A lance hole sealing device for a pressure converter type exhaust gas treatment device, comprising: a clutch door having a U-shaped cross section, the upper side of which is engaged with a tooth-shaped protrusion provided on the outer periphery of the annular metal member of the sealing mechanism.