JP5652916B2 - Skirt seal device for converter exhaust gas treatment equipment - Google Patents

Description

  The present invention relates to a skirt seal device for a converter exhaust gas treatment apparatus that prevents leakage of exhaust gas from the lower end of a hood disposed above the converter and leakage of exhaust gas from between the hood and the converter.

  A converter exhaust gas treatment device for processing gas discharged from a converter is configured to detect exhaust gas leakage from the lower end of a hood disposed above the converter and exhaust gas leakage between the hood and the converter. It has a skirt seal device to prevent it. The skirt seal device generally includes an annular seal jacket formed on the outer peripheral side of a skirt that is installed between the converter and the hood so as to be movable up and down, and a cylindrical partition tube disposed on the outer peripheral side of the hood. And. The seal jacket is filled with sealing water, and the partition tube is immersed in the water in the seal jacket. Further, an annular discharge groove for discharging water overflowing from the upper end of the seal jacket is provided on the outer peripheral side of the seal jacket.

  The exhaust gas from the converter contains a large amount of dust containing fine iron powder, and the dust in the exhaust gas blown up during the refining of the hot metal in the converter enters the seal jacket. The dust in the exhaust gas blown up during blowing is attached to the partition tube, and the dust attached to the partition tube is washed away by the water in the seal jacket when the skirt is moved up and down. Therefore, dust accumulates on the bottom surface of the seal jacket. When the amount of dust accumulated on the bottom of the seal jacket increases, the lower end of the partition tube will eventually hit the dust deposited on the bottom of the seal jacket, and the skirt will not be able to rise, and the converter operation will have to be stopped. A situation arises.

  In order to solve such a problem, a skirt seal device is known in which a plurality of jet nozzles for jetting cleaning water supplied into a seal jacket are installed at the bottom of the seal jacket (see, for example, Patent Document 1). In the skirt seal device described in Patent Document 1, a plurality of ejection nozzles are arranged so that the ejection direction of the ejection nozzles is the tangential direction of the inner wall of the seal jacket. In order to solve this problem, a skirt seal device in which a gas discharge pipe for discharging nitrogen gas is installed at the bottom of a seal jacket is also known (see, for example, Patent Document 2).

JP 11-43713 A JP 2004-162127 A

  In the skirt seal device described in Patent Document 2, since the gas discharge pipe is installed at the bottom of the seal jacket, dust floating in the seal jacket is caused by the bubbles of nitrogen gas discharged from the gas discharge pipe. It is possible to prevent the dust from accumulating on the bottom surface or to push up dust accumulated on the bottom surface of the seal jacket toward the upper end of the seal jacket and discharge it from the upper end of the seal jacket to the discharge groove.

  In order to prevent dust floating in the seal jacket from accumulating on the bottom surface of the seal jacket, or to push up the dust accumulated on the bottom surface of the seal jacket toward the upper end of the seal jacket, it is discharged from the gas discharge pipe. The discharge pressure of nitrogen gas must be a certain pressure or higher. On the other hand, if the discharge pressure of the nitrogen gas discharged from the gas discharge tube is too high, the water in the seal jacket is blown up by the bubbles of nitrogen gas discharged from the gas discharge tube, and more than necessary from the upper end of the seal jacket. It has been confirmed by the inventors of the present invention that the gas overflows, and it is necessary to finely adjust the discharge pressure of the nitrogen gas discharged from the gas discharge pipe and set it to an appropriate pressure.

  However, in general, since the original pressure of nitrogen gas is higher than the appropriate discharge pressure of nitrogen gas to be discharged from the gas discharge pipe, fine adjustment of the discharge pressure of nitrogen gas discharged from the gas discharge pipe is difficult. It has been confirmed by the inventors of the present application.

  Accordingly, an object of the present invention is to provide a skirt for a converter exhaust gas treatment apparatus that can eliminate the need for fine adjustment of the supply pressure of nitrogen gas supplied into the seal jacket in order to prevent dust accumulation in the seal jacket. It is to provide a sealing device.

  In order to solve the above problems, the skirt seal device of the converter exhaust gas treatment apparatus of the present invention is provided on the outer peripheral side of the skirt that is installed between the hood and the converter arranged above the converter so as to be movable up and down. Nitrogen gas is mixed with an annular seal jacket that is formed, a cylindrical partition that is fixed to the outer periphery of the hood and immersed in water in the seal jacket, and cleaning water supplied into the seal jacket And an ejector that injects cleaning water containing bubbles into the seal jacket, and the ejector includes an inflow pipe for cleaning water formed at the tip, and a suction path for nitrogen gas formed on the outer periphery of the nozzle. And a mixing path in which nitrogen gas sucked from the suction path is mixed with the cleaning water sprayed from the nozzle.

  A skirt seal device of a converter exhaust gas treatment apparatus according to the present invention includes an ejector that mixes nitrogen gas with cleaning water supplied into a seal jacket and injects cleaning water containing bubbles of nitrogen gas into the seal jacket. Yes. Further, in the ejector, when cleaning water is jetted from the nozzle formed at the tip of the cleaning water inflow pipe, the inside of the mixing path becomes negative pressure, so that nitrogen gas is sucked from the suction path and the inside of the mixing path Then, nitrogen gas is mixed into the cleaning water, and cleaning water containing nitrogen gas bubbles is jetted from the ejection port of the ejector. Therefore, in the present invention, it is possible to appropriately introduce nitrogen gas bubbles into the seal jacket without fine adjustment of the supply pressure of nitrogen gas supplied into the seal jacket in order to prevent dust accumulation in the seal jacket. It becomes possible to supply. That is, according to the present invention, it is possible to eliminate the need for fine adjustment of the supply pressure of nitrogen gas supplied into the seal jacket.

  Further, in the present invention, since the cleaning water containing nitrogen gas bubbles is injected into the seal jacket by the ejector, the nitrogen gas bubbles contained in the cleaning water injected into the seal jacket are very fine. . Therefore, in the present invention, the cleaning effect in the seal jacket can be enhanced. In addition, since the diameter of the discharge hole of the nitrogen gas formed in the gas discharge pipe described in Patent Document 2 is about several mm, the diameter of the bubble of nitrogen gas discharged from the discharge hole into the seal jacket is about Is about several mm. On the other hand, in the present invention, since the ejector is used, the diameter of the nitrogen gas bubbles injected into the seal jacket can be set to the micrometer level or the nanometer level.

  In the present invention, the ejector is preferably disposed on the bottom side of the seal jacket. In this case, the cleaning water sprayed from the ejector can prevent dust floating in the seal jacket from accumulating on the bottom surface of the seal jacket, and the nitrogen gas sprayed from the ejector together with the cleaning water. Prevents dust floating in the seal jacket from accumulating on the bottom surface of the seal jacket, and pushes the dust accumulated on the bottom surface of the seal jacket toward the upper end of the seal jacket, It becomes possible to discharge from.

  In the present invention, since nitrogen gas is mixed with the cleaning water ejected from the ejector, the bubbles of nitrogen gas ejected together with the cleaning water from the ejector are likely to spread over the entire circumference of the seal jacket formed in an annular shape. Therefore, when the ejector is arranged on the bottom side of the seal jacket, it is effective for dust floating in the seal jacket to accumulate on the bottom surface of the seal jacket due to the nitrogen gas bubbles injected from the ejector together with the cleaning water. It is possible to prevent the dust accumulated on the bottom surface of the seal jacket from being pushed up toward the upper end of the seal jacket, and to be effectively discharged from the upper end of the seal jacket.

  In the present invention, the skirt seal device of the converter exhaust gas treatment device preferably includes a check valve for preventing a back flow of water in the seal jacket to the nitrogen gas supply pipe. If comprised in this way, when injection of the washing water from the nozzle of the inflow pipe stops, it is possible to prevent the water in the seal jacket from flowing into the nitrogen gas supply pipe.

  In the present invention, it is preferable that the plurality of ejectors be arranged so that the cleaning water containing nitrogen gas sprayed from the ejector swirls within the annular seal jacket. With this configuration, it is possible to effectively prevent dust from accumulating on the bottom surface of the seal jacket by swirling the water in the seal jacket with the cleaning water sprayed from the plurality of ejectors. Further, with this configuration, since the nitrogen gas bubbles injected from the plurality of ejectors together with the cleaning water spread around the entire circumference of the seal jacket formed in an annular shape, the dust floating in the seal jacket due to the nitrogen gas bubbles is generated. Is effectively prevented from accumulating on the bottom surface of the seal jacket, and dust accumulated on the bottom surface of the seal jacket is pushed up toward the upper end of the seal jacket and effectively discharged from the upper end of the seal jacket. It becomes possible.

  As described above, in the skirt seal device of the converter exhaust gas treatment apparatus of the present invention, fine adjustment of the supply pressure of nitrogen gas supplied into the seal jacket is unnecessary in order to prevent dust accumulation in the seal jacket. It becomes possible.

It is a schematic side view of the skirt seal apparatus and its peripheral part of the converter exhaust gas processing apparatus concerning embodiment of this invention. It is a top view for demonstrating the skirt seal apparatus of a converter exhaust gas processing apparatus from the EE direction of FIG. It is an enlarged side view for demonstrating the skirt seal apparatus of the converter exhaust gas processing apparatus shown in FIG. It is an enlarged view of the F section of FIG. It is a fragmentary sectional view for demonstrating the internal structure of the ejector shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of skirt seal device of converter exhaust gas treatment device)
FIG. 1 is a schematic side view of a skirt seal device 1 and its peripheral portion of a converter exhaust gas treatment apparatus according to an embodiment of the present invention. FIG. 2 is a plan view for explaining the skirt seal device 1 of the converter exhaust gas treatment device from the EE direction of FIG. 1. FIG. 3 is an enlarged side view for explaining the skirt seal device 1 of the converter exhaust gas treatment device shown in FIG. FIG. 4 is an enlarged view of a portion F in FIG. FIG. 5 is a partial cross-sectional view for explaining the internal structure of the ejector 10 shown in FIG.

  The skirt seal device 1 (hereinafter referred to as “skirt seal device 1”) of the converter exhaust gas treatment device of this embodiment includes a hood 2, a skirt 3, an exhaust gas cooler (not shown), a dust collector (not shown), and It constitutes a part of a converter exhaust gas treatment apparatus having an induction blower (not shown). The hood 2 is configured so that the exhaust gas discharged from the converter 4 passes through the inside of the hood 2 during the blowing process in which oxygen is blown into the converter 4 to refine the molten iron in the converter 4. It is installed above. The skirt 3 is installed between the hood 2 and the converter 4.

  The converter exhaust gas treatment apparatus includes a cylinder 5 that moves the skirt 3 up and down, and the skirt 3 can move up and down. As shown in FIG. 1, the skirt 3 is lowered during blowing for refining the hot metal in the converter 4, thereby preventing the exhaust gas from leaking between the converter 4 and the hood 2. On the other hand, when blowing is not performed, the skirt 3 is raised to tilt the converter 4 and take out the molten steel in the converter 4 (see the two-dot chain lines in FIGS. 1 and 3).

  The skirt seal device 1 functions to prevent the leakage of exhaust gas from the lower end of the hood 2 and the leakage of exhaust gas from between the hood 2 and the converter 4. The skirt seal device 1 includes an annular seal jacket 7 formed on the outer peripheral side of the skirt 3 and a cylindrical partition tube 8 fixed on the outer peripheral side of the hood 2.

  The seal jacket 7 is formed in a double cylindrical shape having an inner peripheral wall 7a and an outer peripheral wall 7b, and the seal jacket 7 is filled with water for sealing. The partition tube 8 is formed in a hollow shape, and cooling water circulates inside the partition tube 8. The partition tube 8 is inserted into the seal jacket 7 and is immersed in the water in the seal jacket 7. An annular discharge groove 9 into which water overflowing from the upper end of the seal jacket 7 flows is installed on the outer peripheral side of the seal jacket 7, and water overflowing from the upper end of the seal jacket 7 is discharged from the discharge groove 9.

  On the bottom side of the seal jacket 7, as shown in FIG. 3, cleaning water (nitrogen gas-containing cleaning water) containing nitrogen gas by mixing nitrogen gas into the cleaning water supplied into the seal jacket 7. Are ejected into the seal jacket 7. As shown in FIG. 2, the plurality of ejectors 10 are arranged at predetermined intervals in the circumferential direction of the seal jacket 7. Further, the plurality of ejectors 10 are arranged on the outer peripheral side of the outer peripheral wall 7 b so that cleaning water containing nitrogen gas is injected from the outer peripheral wall 7 b side of the seal jacket 7 into the seal jacket 7. Further, the plurality of ejectors 10 has a diameter of the seal jacket 7 so that the cleaning water containing nitrogen gas injected from the ejector 10 swirls along the circumferential direction in the seal jacket 7 formed in an annular shape. It arrange | positions so that it may incline with respect to a direction.

  As shown in FIG. 4, the ejector 10 is attached to a holding member 11 that is fixed to the outer peripheral surface of the outer peripheral wall 7 b of the seal jacket 7. An opening 7c through which cleaning water containing nitrogen gas injected from the ejector 10 passes into the seal jacket 7 is formed in the outer peripheral wall 7b so as to correspond to the installation location of the ejector 10.

  As shown in FIG. 5, the ejector 10 includes a cleaning water inflow pipe 13 communicating with the cleaning water supply pipe 12 and a main body pipe 14 in which the inflow pipe 13 is disposed. A nozzle 15 is formed at the tip of the inflow pipe 13. The main body pipe 14 is formed with a pipe connecting portion 14a that protrudes in a direction orthogonal to the axial direction, and a nitrogen gas supply pipe 16 is connected to the pipe connecting portion 14a. A check valve 17 that prevents water from flowing into the supply pipe 16 is disposed at a connection portion between the pipe connection portion 14 a and the supply pipe 16.

  A nitrogen gas suction path 18 is formed on the outer peripheral side of the nozzle 15. Specifically, a suction path 18 is formed between the outer peripheral surface on the front end side of the inflow pipe 13 including the nozzle 15 and the inner peripheral surface of the main body pipe 14 on the front end side with respect to the pipe connecting portion 14a.

  At the front end side of the main body pipe 14, a mixing path 19 in which nitrogen gas sucked from the suction path 18 is mixed with cleaning water sprayed from the nozzle 15 and a diffuser 20 are formed. The mixing path 19 is formed so as to be connected to the opening 15 a of the nozzle 15 and the suction path 18. The inner diameter of the mixing path 19 is constant. The diffuser 20 is formed at the tip of the main body tube 14 so as to be connected to the mixing path 19.

  The diffuser 20 includes a reduced diameter portion 21 connected to the mixing path 19, a fixed diameter portion 22 connected to the reduced diameter portion 21, and a expanded diameter portion 23 connected to the fixed diameter portion 22. The inner diameter of the reduced diameter portion 21 gradually decreases toward the tip of the main body tube 14. The inner diameter of the constant diameter portion 22 is constant. The inner diameter of the enlarged diameter portion 23 gradually increases toward the tip of the main body tube 14. That is, the inner diameter of the diffuser 20 of this embodiment is once narrowed toward the tip of the main body tube 14 and then expanded.

  In the ejector 10, the flow rate of the cleaning water is the fastest at the opening 15 a of the nozzle 15, so when the cleaning water is injected from the nozzle 15, the inside of the mixing path 19 becomes negative pressure, and the suction path 18 moves to the mixing path 19. Nitrogen gas is aspirated. When nitrogen gas is sucked from the suction path 18 to the mixing path 19, the jet of cleaning water sprayed from the nozzle 15 collides with the nitrogen gas, so that nitrogen gas is mixed with the cleaning water in the mixing path 19 and the cleaning water In addition, nitrogen gas bubbles are generated and the nitrogen gas bubbles in the generated cleaning water are finely sheared. The cleaning water mixed with nitrogen gas in the mixing path 19 passes through the diffuser 20 and is injected into the seal jacket 7 from the injection port 10 a of the ejector 10. When cleaning water containing nitrogen gas is injected from the ejector 10, the cleaning water containing nitrogen gas is simultaneously injected and diffused in the seal jacket 7, and the bubbles of nitrogen gas contained in the cleaning water are further increased. It becomes fine.

(Main effects of this form)
As described above, in this embodiment, the ejector 10 that injects cleaning water containing bubbles of nitrogen gas into the seal jacket 7 is disposed on the bottom side of the seal jacket 7. Therefore, it is possible to prevent dust floating in the seal jacket 7 from accumulating on the bottom surface of the seal jacket 7 by the cleaning water sprayed from the ejector 10. Further, it is possible to prevent dust floating in the seal jacket 7 from accumulating on the bottom surface of the seal jacket 7 due to the bubbles of nitrogen gas injected from the ejector 10 together with the cleaning water, and the bottom surface of the seal jacket 7. It is possible to push up the dust accumulated on the seal jacket 7 toward the upper end of the seal jacket 7 and discharge it from the upper end of the seal jacket 7 to the discharge groove 9.

  In particular, in the present embodiment, the plurality of ejectors 10 are arranged so that the cleaning water containing nitrogen gas sprayed from the ejector 10 swivels along the circumferential direction in the seal jacket 7 formed in an annular shape. Therefore, bubbles of nitrogen gas injected together with the cleaning water from the ejector 10 spread over the entire circumference of the seal jacket 7 formed in an annular shape. Therefore, in this embodiment, it is possible to effectively prevent dust floating in the seal jacket 7 from accumulating on the bottom surface of the seal jacket 7 due to nitrogen gas bubbles injected from the ejector 10 together with the cleaning water. At the same time, dust accumulated on the bottom surface of the seal jacket 7 can be pushed up toward the upper end of the seal jacket 7 and effectively discharged from the upper end of the seal jacket 7 to the discharge groove 9.

  Further, in this embodiment, the plurality of ejectors 10 are arranged so that the cleaning water containing nitrogen gas sprayed from the ejectors 10 swirls along the circumferential direction in the seal jacket 7 formed in an annular shape. Therefore, it is possible to effectively prevent dust from accumulating on the bottom surface of the seal jacket 7 by swirling the water in the seal jacket 7 with the cleaning water sprayed from the plurality of ejectors 10.

  Further, in the present embodiment, since the ejector 10 injects cleaning water containing nitrogen gas bubbles into the seal jacket 7, the nitrogen gas bubbles contained in the cleaning water injected into the seal jacket 7 are: Very fine. Therefore, in this embodiment, the cleaning effect in the seal jacket 7 can be enhanced.

  In this embodiment, when cleaning water is jetted from the nozzle 15 formed at the tip of the cleaning water inflow pipe 13, the inside of the mixing path 19 becomes negative pressure, and nitrogen gas is sucked from the suction path 18 to the mixing path 19. The Further, nitrogen gas is mixed with the cleaning water in the mixing path 19, and the cleaning water mixed with the nitrogen gas is injected from the injection port 10 a of the ejector 10. Therefore, in this embodiment, the seal jacket can be used without fine adjustment of the supply pressure of the nitrogen gas supplied into the seal jacket 7 (fine adjustment of the supply flow rate) in order to prevent dust from accumulating in the seal jacket 7. Nitrogen gas bubbles can be appropriately supplied into the inside 7. That is, in this embodiment, fine adjustment of the supply pressure of nitrogen gas supplied into the seal jacket 7 is not necessary.

  In this embodiment, a check valve 17 for preventing water from flowing into the supply pipe 16 is disposed at a connection portion between the pipe connection portion 14 a of the main body pipe 14 constituting the ejector 10 and the nitrogen gas supply pipe 16. ing. Therefore, even if the ejector 10 is disposed on the bottom side of the seal jacket 7, it is possible to prevent the water in the seal jacket 7 from flowing into the supply pipe 16 when the injection of the cleaning water from the nozzle 15 stops. Can do.

1 Skirt seal device (skirt seal device for converter exhaust gas treatment device)
2 Hood 3 Skirt 4 Converter 7 Seal jacket 8 Partition tube 10 Ejector 13 Inflow pipe 15 Nozzle 16 Supply pipe 17 Check valve 18 Suction path 19 Mixing path

Claims (4)

An annular seal jacket formed on the outer peripheral side of a skirt installed between the hood disposed above the converter and the converter so as to be movable up and down, and an inner side of the seal jacket fixed to the outer peripheral side of the hood A cylindrical partition tube immersed in the water, and an ejector for mixing the cleaning water supplied into the seal jacket with nitrogen gas and injecting the cleaning water containing bubbles of the nitrogen gas into the seal jacket And
The ejector includes an inlet pipe for the cleaning water having a nozzle formed at a tip thereof, a suction path for the nitrogen gas formed on an outer peripheral side of the nozzle, and a suction path for the cleaning water sprayed from the nozzle. A skirt seal device for a converter exhaust gas treatment device, comprising: a mixing passage through which the sucked nitrogen gas is mixed.   The skirt seal device for a converter exhaust gas treatment apparatus according to claim 1, wherein the ejector is disposed on a bottom side of the seal jacket.   The skirt seal device for a converter exhaust gas treatment apparatus according to claim 1 or 2, further comprising a check valve for preventing a back flow of water in the seal jacket to the supply pipe of the nitrogen gas.   4. The ejector according to claim 1, wherein the plurality of ejectors are arranged so that the cleaning water containing nitrogen gas sprayed from the ejector swirls in the annular seal jacket. 5. The skirt seal device for the converter exhaust gas treatment as described.

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