JP2009203530A - Skirt sealing apparatus for converter waste gas treatment equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a skirt sealing apparatus in which a sealing structural portion liable to thermally deform due to thermal expansion difference is configured to be hardly affected by heat and which therefore allows not only dust but also metal to be easily removed and is effective for materializing sure sealing effect. <P>SOLUTION: The skirt sealing apparatus for converter waste gas treatment equipment seals, through an ascendable/descendable cylindrical skirt, between a nose of a converter and a hood connected with a waste gas duct, wherein the skirt sealing apparatus is composed of; an annular sealing jacket having U-shaped cross section and vertically moved together with the skirt; a sealing tube which is fixedly set in the sealing jacket and is held so that its lower end part is always immersed in water in the sealing jacket; and a sliding sealing tube in which a dust removal ring to be interposed between a gap between the sealing jacket inner sidewall and the sealing tube is provided in an inward protruding condition. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a skirt seal device for a converter exhaust gas treatment facility, and more particularly to a technique for preventing intrusion of dust and the like into a seal jacket attached to the skirt.

  In refining converters, hot CO gas is generated during operation due to top and bottom blowing of oxygen. For this reason, an exhaust gas treatment facility is disposed on the top of the converter 1 via the hood 2 at the extended position, and a skirt seal device as shown in FIG. 1 is provided on the converter furnace port 1a. Arranged.

  For example, FIG. 1 shows the structure of a conventional skirt seal provided at the converter furnace port. In this figure, a hood 2 for guiding exhaust gas to an exhaust gas duct (flue) is disposed at the top of the furnace port 1a of the converter 1, and a seal called a partition tube is provided on the outer periphery of the hood 2. The cylinder 3 is fixed downward. On the other hand, a skirt 8 having an annular groove (seal jacket) 7 constituted by an inner wall 4 and an outer wall 5 is disposed below the seal cylinder 3 so as to be movable up and down between the furnace port 1a. . The annular groove 7 is filled with sealing water, and is sealed by immersing the lower end portion of the sealing cylinder 3 in the water. In particular, the skirt 8 is lowered. Thus, the furnace port 1a can be completely sealed in a state in which the converter port 1a is in contact with the furnace port 1a.

  The reason why such a seal structure is formed in the furnace port portion of the converter is that, in the case of the converter, a large amount of CO gas is generated during operation, and depending on the mixing ratio, there is a risk of explosion due to reaction with air. Therefore, a skirt seal device as shown in FIG. 1 is provided and sealed between the furnace port and the hood so that outside air does not enter.

  A general skirt seal device including the one shown in FIG. 1 is provided with a groove (seal jacket) having a U-shaped cross section on the outer periphery of the skirt as described above. Even when the lower end portion of the seal cylinder fixed to the lower end is moved up and down for tilting of the converter, the structure is sealed so that it is always immersed in water.

  By the way, the gas generated from the converter contains not only the CO gas but also a large amount of dust containing fine iron powder. Therefore, such dust blown up with the gas during the converter blowing is put into the annular seal jacket which is the water seal portion of the skirt seal portion, or adheres to the seal cylinder 3 or the like when the skirt is moved up and down. The dust is washed into the seal jacket by being washed away by seal water, and gradually accumulates at the bottom, and eventually the lower end of the seal cylinder 3 comes into contact with the accumulated dust, and the skirt 8 moves up and down. This causes troubles that require the converter operation to be stopped.

  In order to solve such a problem, conventionally, in Patent Document 1, a shield plate is installed between the skirt and the hood so that dust generated in the furnace does not enter the seal jacket. A device is proposed.

  In addition, the skirt seal device disclosed in Patent Document 2 has a flexible seal member disposed in a seal jacket, and is designed to prevent the skirt from moving up and down even if dust accumulates in the jacket. The skirt seal device disclosed in Patent Document 3 is a technique in which a chain is disposed in a seal jacket to stir intruding dust and discharge, and Patent Document 4 A skirt seal device for removing accumulated dust using a screw is disclosed.

Furthermore, the dust prevention device for a converter exhaust gas treatment facility shown in FIG. 1 disclosed in Patent Document 5 has an outer diameter slightly smaller than the inner diameter of the partition tube at the upper end of the seal jacket and slides along the inner wall of the partition tube. A moving ring cover 6 is attached.
Japanese Utility Model Publication No. 3-59350 Japanese Patent Laid-Open No. 61-3820 JP 59-166614 A JP 59-166613 A JP 11-43712 A

  As a result of studying each of the above-described conventional techniques and actually using at least a part thereof, it has been found that the following problems remain to be solved for each apparatus.

  That is, in the case of the skirt seal device disclosed in Patent Document 1 or Patent Document 5, since the structure does not take into account the difference in thermal expansion that occurs between when the converter is in operation and when it is not in operation, Not only does it prevent the dust from entering the seal jacket as expected due to thermal deformation, but also the treatment of the dust that accumulates in the vicinity of the furnace opening becomes insufficient, which may deteriorate the working environment. There was a problem of inviting.

  Next, Patent Document 2, Patent Document 3 and Patent Document 4 are effective discharge technologies mainly for dust accumulated in the seal jacket, and are technologies for preventing dust from entering the seal jacket. However, there is still a need for improvement in that trouble is likely to occur when excessive dust enters and large bullion generated by spitting cannot be removed.

  The object of the present invention is that it is effective in realizing a reliable sealing effect for a seal structure portion that is susceptible to thermal deformation due to a difference in thermal expansion, being less susceptible to heat, easy to remove not only dust but metal. It is to propose a skirt seal device.

  In the research for realizing the above object, the inventor obtained the knowledge that the following skirt seal device is effective in solving the above-described problems of the prior art, and completed the present invention. .

  That is, the present invention is a skirt seal device that seals between a furnace opening of a converter and a hood connected to an exhaust gas duct via a cylindrical skirt that can be moved up and down, and is disposed in contact with the outer periphery of the skirt. An annular seal jacket having a U-shaped cross section that moves up and down together with the skirt, and a seal cylinder fixedly installed above the seal jacket and held so that its annular lower end is always immersed in the water in the seal jacket. A converter exhaust gas characterized by comprising a slide seal cylinder inserted in a gap between the inner wall of the seal jacket and the seal cylinder and having a dust-removing ring projecting inward in the vicinity of the upper end portion. This is a skirt seal device for a processing facility.

In the present invention,
(1) The slide seal cylinder is provided with a plurality of slits formed by cutting in the axial direction from the upper end in the circumferential direction;
(2) In the slide seal cylinder, the upper surface of the dust ring is inclined downward.
(3) In the slide seal cylinder, at least the inclined upper surface portion of the dust ring is formed of a fireproof and heat insulating material,
(4) The fireproof and heat insulating material portion of the dust ring is made of a refractory material having a triangular cross section.
(5) The slide seal cylinder is configured to suspend the lower surface of the dust ring from the upper end edge of the inner wall of the seal jacket and hold it so as to slide in the horizontal direction.
Gives a more preferred solution.

  As explained above, according to the present invention, it is possible to easily remove dust generated together with gas from the converter and bullion generated by spitting, and the skirt seal device itself can be operated smoothly over a long period of time. it can. Moreover, according to this invention, the burden of dust and a bullion removal work can be reduced significantly. Furthermore, according to the present invention, troubles due to dust and bullion are greatly reduced, so that the converter operating rate can be improved, the manufacturing cost can be reduced, and the equipment cost can be reduced.

  FIG. 2 shows a skirt seal device provided at the converter furnace opening according to the present invention. In this figure, a hood 2 that guides exhaust gas to an exhaust gas treatment facility through an exhaust gas duct is disposed on a furnace port 1 a of the converter 1. A concentric seal cylinder 3 is fixed downward on the outer periphery of the hood 2. On the other hand, a cylindrical skirt 8 is provided below the hood 2 and the seal cylinder (partition cylinder) 3 so as to be interposed between the furnace port 1a and movable up and down. The seal tube 3 and the skirt 8 block the furnace port 1a portion of the converter 1 from outside air.

  Further, on the outer peripheral portion of the skirt 8, a U-shaped annular seal jacket 9 having a drainage groove 9a is fixed. The seal jacket 9 moves up and down together with the skirt 8 to move up and down. Although it approaches or separates from the lower end of the cylinder 3, the lower end portion of the seal cylinder 3 is always water-sealed. For this purpose, sealing water is introduced into the seal jacket 9 as cooling water from a plurality of locations in the circumferential direction of the seal cylinder 3. And the lower end part of this seal | sticker cylinder 3 is the structure which water-seal | closes a furnace port part by being immersed in the water in the seal jacket 9, and being always immersed in the water. That is, when the skirt 8 is lowered and its lower end is brought into contact with the furnace port 1a of the converter 1, a complete seal can be realized.

  With regard to the structure of such a skirt seal device, particularly the structure of the seal jacket 9 part, in the present invention, as shown in the enlarged view of FIG. 2B, the seal jacket inner side wall 9b formed of an annular groove, and the seal jacket 9 By inserting a slide seal cylinder 10 capable of moving (sliding) in the radial direction into a gap formed between the lower part of the seal cylinder 3 inserted in the inside of the furnace, the inner side of the seal jacket 9 By closing the upper opening, no dust or metal was allowed to enter the seal jacket 9.

  The slide seal cylinder 10 has a dust ring 11 that protrudes inwardly in the vicinity of the upper end and is inclined downward (toward the center of the shaft). The bottom surface of the dust ring 11 is placed on the inner wall 9b of the seal jacket. It is placed on the edge so that it is suspended, and the lower part is kept in the seal water in the seal jacket 9 so that it is always immersed in the seal water without being affected by the elevation of the skirt 8. And the seal | sticker on the furnace port 1a part is implement | achieved.

  That is, by adopting such a configuration, the space on the furnace port 1a surrounded by the seal cylinder 3 and the skirt 8 can prevent leakage and diffusion of CO gas and dust to the outside when the skirt 8 is lowered. It becomes possible to seal to the extent.

  In addition, since the slide seal cylinder 10 is simply placed and suspended on the upper end of the inner wall 9b of the seal jacket, it can be moved (slid) at least in the radial direction, and as shown in FIG. Even if a misalignment (g) or a positional deviation (g) due to a difference in thermal expansion occurs, the misalignment can be sufficiently absorbed, and the skirt 8 can be always lifted and lowered smoothly.

  By adopting the skirt seal device having such a structure, according to the present invention, the gap generated between the upper opening of the seal jacket 9 and the lower inner side of the seal tube 3 can be minimized. Thus, the entry of foreign matter such as dust and metal into the seal jacket 9 can be effectively prevented. In particular, in the case of the present invention, it is possible to reliably prevent the entry of large bullion, and the remaining is dust that is considered to enter slightly, and this is also during the draining operation as will be described later. It can be easily discharged and removed.

  That is, most of the dust and bullion generated in the furnace are configured to return to the furnace through the furnace port 1a without being blocked by the dust ring 11 and entering the seal jacket 9. As for most, it is sent out to the exhaust gas duct through the hood 2 and can be discharged to the exhaust gas treatment facility at a high yield.

In order to make this action more effective, in a preferred embodiment of the present invention, the upper surface of the dust ring 11 is inclined inward and at least the surface thereof is made of alumina or silica. It is configured to be covered with a refractory / heat insulating material (linear expansion coefficient of 7.1 × 10 ⁻⁶ / ° C., thermal conductivity of about 0.89 w / m · k), or the main part of the ring 11 is shown in FIG. As shown in (b), it is formed of a fireproof heat insulating material (high alumina) 11a having a substantially triangular cross section.

  Further, in the present invention, as shown in FIG. 4, an upper portion including the dust-removing ring 11 of the slide seal cylinder 10 is not provided toward the axial direction at a plurality of locations in the circumferential direction. As the structure provided with the slits 12, extreme thermal deformation is unlikely to occur when the converter is in operation and at rest. Further, the slide seal cylinder 10 itself is a long cylinder in the axial direction, and the lower part thereof is always cooled by being immersed in the seal water in the seal jacket 9, thereby providing heat resistance and at the same time due to a difference in thermal expansion. Use a shape that does not easily cause thermal deformation.

  In the above-described skirt seal device according to the present invention, with regard to the discharge of the dust that has slightly entered the seal jacket 9, the cleaning water introduced from the seal water spray nozzle provided in the vicinity of the bottom is injected and introduced into the interior. To do. That is, the settling dust in the seal jacket 9 is stirred and flowed by the introduced washing water and discharged as a drain. Preferably, the washing water to be introduced is jetted in a tangential direction in the jacket, and a rotating flow is caused in the circumferential direction in the jacket to improve the flow characteristics of the settled dust and discharge it. The washing water supplied from the jet nozzle into the seal jacket 9 is discharged from the upper portion of the jacket together with dust having a small specific gravity, and a part of the replacement water discharge pipe is disposed at the lower portion together with dust having a large specific gravity. It is discharged as more drain.

  By adopting the skirt seal device according to the above-described configuration, in particular, the slide seal cylinder 10, the frequency of the seal jacket sudden cleaning due to clogging of the seal jacket and damage due to aging deformation is conventionally about 5 times / year, Can be reduced to less than once per year.

  The seal structure of the skirt seal device of the present invention is not only useful as a dust and metal discharging technique, but is also effective as an efficient technique for collecting dust and metal.

It is sectional drawing of the conventional skirt seal apparatus. It is sectional drawing of the skirt seal apparatus which concerns on this invention, and the partial expanded sectional view of a slide seal | sticker cylinder. It is a fragmentary sectional view of the skirt seal apparatus which shows other embodiment of this invention. It is a fragmentary sectional view of the skirt seal apparatus which shows other embodiment of this invention.

Explanation of symbols

1 Converter 1a Furnace port 2 Hood 3 Seal tube (partition tube)
8 Skirt 9 Seal jacket 10 Slide seal cylinder 11 Dust removal ring 11a Fireproof heat insulating material 12 Slit

Claims (6)

In the skirt seal device that seals between the furnace port of the converter and the hood connected to the exhaust gas duct through a cylindrical skirt that can be raised and lowered,
A seal jacket with a U-shaped cross section that is disposed in contact with the outer periphery of the skirt and moves up and down together with the skirt, and is fixedly installed above the seal jacket, and its annular lower end is always in the water in the seal jacket. A seal cylinder that is held so as to be immersed, and a slide seal cylinder that is inserted in a gap between the inner wall of the seal jacket and the seal cylinder and that has a dust-removing ring projecting inward in the vicinity of the upper end. A skirt seal device for a converter exhaust gas treatment facility. 2. The skirt seal device for a converter exhaust gas treatment facility according to claim 1, wherein the slide seal cylinder is provided with a plurality of slits formed by cutting in an axial direction from an upper end in a circumferential direction thereof. . 3. The skirt seal device for a converter exhaust gas treatment facility according to claim 1, wherein an upper surface of the dust ring is inclined downward in the slide seal cylinder. The skirt seal device for a converter exhaust gas treatment facility according to any one of claims 1 to 3, wherein the slide seal cylinder is formed with a fireproof and heat insulating material at least an inclined upper surface portion of the dust ring. The skirt seal device for a converter exhaust gas treatment facility according to claim 4, wherein the fireproof and heat insulating material portion of the dust ring is made of a refractory having a triangular cross section. 6. The slide seal cylinder according to claim 1, wherein the lower surface of the dust ring is suspended from the upper edge of the inner wall of the seal jacket and is slid in the horizontal direction. Skirt seal device for converter exhaust gas treatment equipment.

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