JPH0717934B2 - Sublance seal device for pressure hood - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a molten metal furnace such as a converter, an electric furnace, and a smelting reduction furnace used for melting, refining or reducing a metal The present invention relates to a sublance sealing device used for temperature measurement and sampling of metal, and particularly to a sublance sealing device for a pressure hood of a pressure-sealed molten metal furnace.

(Prior Art) Generally, the sublance is put into and taken out of the molten metal furnace through a sublance hole formed in a furnace mouth hood like the lance. Further, in the conventional molten metal furnace, the gas pressure in the furnace is at or near atmospheric pressure, and most of the furnace equipment has a structure for sucking the gas in the furnace with a suction device. Even if it was opened, the gas in the furnace was hard to leak outside. Therefore, conventionally, an opening / closing gate is provided in the sublance hole, and the opening / closing gate is opened when the sublance is taken in and out. Also, regarding the sealing device of the lance for blowing,
Conventionally, a labyrinth-like seal is formed on the inner surface of the lance insertion hole, and a seal box is integrally provided on the upper surface of the lance cone that fits into the lance hole, and an inert gas introduction pipe is connected to the lance cone and the seal box. The labyrinth seal and the joint of the lance hole are sealed with an inert gas (Japanese Patent Publication No. Sho 62-20257). The upper end of the double cylindrical expansion filled with cooling liquid is placed in the proper position of the lance. It is attached to the upper part of the lance through the seal member and the lower end of the expansion is installed (Japanese Patent Publication No. 62
-20258) has been proposed.

(Problems to be Solved by the Invention) By the way, in the recent molten metal furnace, the metallurgical reaction is accelerated by making the gas pressure in the furnace considerably higher than the atmospheric pressure. There are various merits such as being able to lead to the treatment equipment and increasing the recovery rate of combustible components in the gas, so there is a tendency to keep the gas pressure in the furnace at a high pressure for operation.

In such a case, in the above-mentioned conventional sublance seal device, when the opening / closing gate is opened, toxic gas containing a large amount of CO gas in the furnace is blown out, which is dangerous, and the pressure in the furnace is lowered to operate. May cause problems with In particular, since the temperature of the molten metal is constantly monitored, it cannot be applied to a molten metal furnace in which a sublance is frequently put in and taken out of the furnace.

Further, it is conceivable to apply the above-mentioned conventional lance seal device to the sub-lance seal device, but the former is
There is a small gap between the lance (sublance) and the labyrinth seal, so even if you seal with an inert gas, if the pressure inside the furnace becomes much higher than atmospheric pressure, the gas inside the furnace may leak to the outside. There is. The latter is limited in the expansion and contraction length of the expansion, so it is good if the vertical movement range (blowing position and standby position) is limited like the lance, but it is necessary to completely withdraw it from the furnace like the sub lance. If there is, it is inappropriate.

(Object of the Invention) The present invention has been made in view of the above points, and during the pressure operation of the molten metal furnace, the sublance can be inserted into and removed from the furnace while reliably maintaining the airtightness of the insertion port of the sublance. The present invention is intended to provide a sublance seal device suitable for operations that frequently require sampling and temperature measurement.

(Means for Solving the Problems) The gist of the present invention for achieving the above-mentioned object.
However, a pressurizing hood that pressurizes and seals the furnace opening of the molten metal furnace is provided with an insertion port through which the sublance can be inserted and removed, and an outer cylinder is integrally connected to the insertion port, and a substantially middle portion of the sublance. A seal ring member is slidably mounted on the periphery, and a seal device that can be in close contact with the lower end of the seal ring member is disposed in the upper end opening of the outer cylinder, and the communication passage is formed near the lower end of the outer cylinder. A seal gate that can be shut off is provided, and a high pressure inert gas supply pipe is connected to the outer cylinder above the seal gate.

(Operation) According to the sublance seal device of the present invention, in the normal state, that is, the state before the sublance is inserted into the furnace, the communication passage near the lower end of the outer cylinder is blocked by the seal gate, and the insertion opened in the support member is performed. The mouth portion is also kept airtight by joining the seal device and the seal ring member around the sublance. When inserting the sublance into the furnace, first introduce a high-pressure inert gas into the outer cylinder to make the pressure inside the outer cylinder equal to the pressure inside the furnace, and after opening the seal gate. , The sub-lance is slid downward with respect to the seal ring member at the fixed position, and the lower end of the sub-lance is inserted into the molten metal in the furnace. In this way, after measuring or sampling the temperature of the molten metal, the sub lance is slid upward with respect to the seal ring member, the sub lance is pulled up to the original position from the inside of the furnace, and the seal gate is shut off. further,
In order to collect the sampled metal sample, the seal gate is shut off, and the toxic gas (furnace gas) in the outer cylinder is expelled by the introduced inert gas, and then the sublance is attached to the support member together with the seal ring member. Pull up from the insertion port and collect the metal sample collected in the lower end of the sublance. During this time, the communication passage near the lower end of the outer cylinder is blocked by the seal gate, and airtightness is maintained.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a converter as a molten metal furnace.
The furnace opening 1 a of the converter 1 is closed by a pressure hood 2. A lance 3 for blowing is provided at the center of the pressure hood 2, and a sub-lance 4 for temperature measurement and sampling is provided at the side of the lance 3 so that it can be inserted into and removed from the furnace 1. Reference numeral 4a is a probe attached to the tip of the sublance 4.

FIG. 2 is an enlarged view of a main part of FIG. 1, and in the figure, an insertion opening 5 is provided in the pressure hood 2 and an insertion opening 7 is provided in a building 6 above it in series. The upper and lower insertion openings 5 and 7 are connected by an outer cylinder 8 into which the sub lance 4 can be loosely inserted, and the insertion openings 5 and 7 communicate with each other. Further, the outer cylinder 8 is vertically divided at its upper portion so that the pressure hood 2 can be moved up and down.
b (see FIG. 4) is connected in a telescopic manner, and a telescopic seal 8c is interposed at the connecting point.
The lower divided tube 8b is separably connected at its intermediate portion 8d. Further, a seal ring member 9 is vertically slidably mounted around a substantially middle portion of the sub lance 4, and a seal cover body 10 having a lower end portion formed in a cone shape around the seal ring member 9 is provided. Is being worn. At the upper part of the building-side 6 insertion opening 7, a sealing device 11 is provided to which the lower end of the seal cover body 10 can be fitted and adhered. A securing mechanism 12 for pressing and fixing the seal cover body 10 to the seal device 11 with the seal cover body 10 fitted to the seal device 11 is provided on the building 6. This lashing mechanism 12, as shown in detail in FIGS. 4 and 5,
Forming taper holes 10a on both sides of the seal cover body 10,
A pair of fitting pieces 12a that can be fitted into these tapered holes 10a.
Is a fluid pressure cylinder 12b that is pivotally attached to a support seat 12f on the building 6.
It has a structure in which the fitting piece 12a is moved forward and backward with respect to the seal cover body 10 along a pair of guide members 12e fixedly mounted on the building 6 by the extension and contraction of the cylinder 12b.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. 2, in which 13 is a seal gate box provided in communication with the lower end portion of the outer cylinder 8. 13a
Is pivotally attached to the tip of the cylinder rod 13c of the fluid pressure cylinder 13b. Then, due to the extension movement of the cylinder 13b, the seal gate 13a moves along the guide member 13d and blocks the communication passage 8a. 13e is a seal member mounted on the upper surface of the seal gate 13a, and 13f is a seal member mounted on the inner circumference of the insertion hole of the cylinder rod 13c.

Further, in FIG. 2, reference numeral 14 is a supply pipe of a high pressure (above furnace pressure) inert gas (for example, nitrogen gas), one end of which is connected to an inert gas source (not shown), and an on-off valve 14a and a check valve 14b are provided. The other end of the supply pipe 14 is connected to a substantially middle portion of the outer cylinder 8 via. Also, the supply pipe 14 is branched in the middle,
The branch portion is opened to the atmosphere via another on-off valve 14c.

Further, an inert gas exhaust pipe 15 having a check valve 15a interposed is connected to the outer cylinder 8 below the outer cylinder 8 with the seal gate box 13 interposed therebetween, and the supply pipe 14 allows the inside of the outer cylinder 8 to be inserted. A part of the inert gas introduced into the pressure hood 2 is discharged into the pressure hood 2 through the exhaust pipe 15.

FIG. 6 shows a state in which the sub lance 4 is pulled up above the sealing device 11 together with the seal ring member 9.

Next, the usage of the above-described embodiment will be described.

In FIG. 2, in a state before the sublance 4 is inserted into the furnace 1, the communication passage 8a near the lower end of the outer cylinder 8 is blocked by the seal gate 13a, and the insertion port 7 opened in the building 6 is also a sealing device. Airtightness is maintained by joining 11 and the lower end of the seal cover body 10 of the sublance 4. In this state, the seal cover body 10 is pressed and fixed to the seal device 11 by the fitting piece 12a of the securing mechanism 12. When the sublance 4 is inserted into the furnace 1, the on-off valve 14a is opened to introduce a high pressure inert gas into the outer cylinder 8 through the supply pipe 14 so that the pressure in the outer cylinder 8 is kept within the furnace 1. Higher than pressure. Then, after the seal gate 13a is opened by contracting the cylinder 13b, the sub lance 4 is slid downward with respect to the seal ring member 9 held at a fixed position by the seal cover body 10 to lower the lower end of the probe 4a of the sub lance 4. The part is inserted into the molten metal in the furnace 1. Thus, the temperature of the molten metal is measured or sampled under the condition that the upper insertion port 7 is sealed by the seal ring member 9, the seal cover body 10 and the sealing device 11, and then the sub-lance is applied to the seal ring member 9. Four
Is slid upward, the sublance 4 is pulled up from the furnace 1 to the original position, the cylinder 13b is extended, and the communication passage 8a is blocked by the seal gate 13a. At the time of collecting the sampled metal sample, after shutting off the communication passage 8a with the seal gate 13a, the inert gas is continuously introduced from the supply pipe 14 into the outer cylinder 8 to remove the inert gas from the furnace 1. The poisonous in-furnace gas that has entered the inside is discharged into the furnace 1 through the exhaust pipe 15. Then, the cylinder 12b is contracted so that the fitting piece 12a is withdrawn from the seal cover body 10, and the sub lance 4 is pulled upward together with the seal ring member 9 and the seal cover body 10 from the insertion opening 7 as shown in FIG. The probe 4a at the tip of the sublance 4 is pulled out, and the molten metal collected in the lower end portion thereof is recovered.

In this manner, with at least one of the upper insertion port 7 and the lower insertion port 5 (correctly, the communication passage 8a at the lower end of the outer cylinder 8) sealed, the sublance 4 is taken in and out of the furnace 1,
The temperature of the molten metal can be measured, or sampling can be performed.

In the above embodiment, the building 6 is also provided with an insertion opening 7 for the sub-lance 4, and the insertion opening 7 and the insertion opening 5 on the pressure hood 2 side are connected by an outer cylinder 8 for communication. However, when there is no building 6 or the like above the pressure hood 2, the outer cylinder 8 is integrally connected to the insertion opening 5 of the pressure hood 2, and the sealing device is provided at the upper end opening of the outer cylinder 8. 11 may be provided.

(Effects) As described above, since the sublance seal device of the present invention has the above-mentioned configuration, it has the following effects.

(1) Compared to the above-described conventional sealing device, the sublance insertion port can be reliably pressure-sealed, so that the gas in the furnace is blown out even if the pressure in the molten metal furnace is considerably higher than atmospheric pressure. And does not pollute the work environment.

(2) Since the inside of the molten metal furnace can be made to have a high pressure in accordance with the effect of the above (1), the above-described various merits are brought about by increasing the pressure in the furnace.

(3) Even when the sublance is inserted into or removed from the furnace, the insertion opening can be reliably sealed, which is particularly suitable for operations that frequently require temperature measurement or sampling of the molten metal in the furnace.

[Brief description of drawings]

1 is an overall sectional view of the converter, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 2, and FIG.
FIG. 4 is a detailed sectional view of the upper insertion opening portion of FIG. 2, and FIG.
FIG. 6 is a plan view of the drawing, and FIG. 6 is a sectional view in a direction different from that of FIG. DESCRIPTION OF SYMBOLS 1 ... Converter, 2 ... Pressurization hood, 4 ... Sublance, 5, 7 ... Insertion port, 6 ... Building, 8 ... Outer cylinder, 8a ... Communication passage, 9 ... Seal ring member, 10 ... Seal cover body, 11 ... Sealing device, 12 ...
Locking mechanism, 13a ... Seal gate, 14 ... Inert gas supply pipe.

Claims (4)

[Claims] 1. A pressurizing hood for pressurizing and sealing a furnace opening of a molten metal furnace is provided with an insertion opening into which a sublance can be inserted and removed, and an outer cylinder is integrally provided on the insertion opening to form a sub-lance. A seal ring member is slidably mounted around the middle portion, and a seal device capable of being in close contact with the lower end of the seal ring member is provided in the upper end opening of the outer cylinder, and is connected near the lower end of the outer cylinder. A sublance seal device for a pressurized hood, comprising a seal gate capable of blocking a passage, and a high pressure inert gas supply pipe connected to an outer cylinder above the seal gate. 2. A sub-lance seal device for a pressure hood according to claim 1, wherein a lashing mechanism for pressing and fixing the seal ring member to the seal device is provided at an upper end opening of the outer cylinder or in the vicinity thereof. . 3. An opening through which a sublance can be inserted and removed is opened in the building above the pressure hood, the upper end of the outer cylinder is connected to the opening, and the sealing device is attached to the opening on the building side. The sub lance seal device for a pressure hood according to claim 1, wherein the sub lance seal device is provided. 4. The pressure hood sublance seal device according to claim 3, wherein the outer cylinder is divided into upper and lower parts, and a telescopic seal is interposed between the divided parts.