JP2508877Y2 - Refining equipment - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention has a hood that can be raised and lowered and is airtightly attached to the furnace opening of the refining furnace, and the gas discharged from the furnace opening of the refining furnace is described above. The present invention relates to a refining device configured to collect via a hood.

<Prior Art> Generally, in this type of refining apparatus, there are many types in which the furnace body is moved or tilted for feeding raw materials or discharging molten metal, and therefore the hood is evacuated from the furnace body. Function is required. (Refer to Japanese Patent Laid-Open No. 1-252891) <Problems to be solved by the invention> However, in the case where the hood is formed on the membrane tube wall which is an assembly of cooling pipes and fins, the refractory throat of the refining furnace is Since it is cooled by the membrane tube wall, slag containing metal and iron components in the gas discharged from the furnace opening of the refining furnace is attached, and the adhered material is the hood and refractory furnace refractory It grows and solidifies all around the joint.

Therefore, when moving the furnace body for feeding raw materials or discharging molten metal, first, even if trying to open the hood from the furnace body, it is impossible or impossible to open it. Doing so will damage the hood and furnace refractories. Moreover, even if the hood can be forcibly released from the furnace body, the deposit remains firmly solidified in the refractory throat refractory of the refining furnace, when its growth is remarkable, It is extremely difficult to move or tilt the furnace body by protruding from the furnace mouth portion to the hood side, and even in that case, if this is forcedly performed, there is a problem that the hood and the furnace mouth refractory are damaged.

This also has substantially the same problem with the cooling device for the furnace hood of the metallurgical furnace disclosed in Japanese Utility Model Publication No. 59-2477.

Further, conventionally, a skirt that can be moved up and down is provided between the furnace opening of the converter and the hood, a seal ring is provided at the lower end of the skirt, and a large number of ejection nozzles are provided on the inner peripheral side of the seal ring. Steam or oxygen is ejected from the ejection nozzle toward the inside of the furnace opening to prevent the slag from rising, and a gas curtain is formed between the furnace opening and the skirt to prevent the gas discharged from the furnace opening. There is known one configured to prevent external leakage and invasion of outside air into the skirt (see Japanese Patent Laid-Open No. 61-257411).

In the above configuration, if steam is jetted from the jet nozzle, the rise of the slag can be suppressed by the cooling action thereof, but when jetting oxygen, combustible components generated in the furnace body are burned to heat the slag, The rise cannot be prevented, and the raised slag adheres to and solidifies at the furnace opening, and there is a problem substantially similar to the case of the above-mentioned conventional example.

Further, the seal ring and the jet nozzle are provided between the furnace opening and the skirt, and are constantly exposed to the high temperature slag rising from the furnace opening and burned out, resulting in a short service life. .

<Purpose of the Invention> The present invention was made in order to solve the above problems, and provides a refining apparatus having a long-life and compact gas ejection structure and cooling structure, which prevents damage to the hood and furnace refractory materials. The purpose is to do.

<Means for Solving the Problem> The present invention is directed to a refining furnace having a refractory attached to the inner peripheral surface thereof,
The refining furnace is provided with a hood that is vertically attached to the furnace opening, and the hood has a cooling water passage formed therein and an annular flange that is detachably attached to the furnace opening, and this flange. Membrane tube wall consisting of a number of cooling pipes that are fixed to the section and communicate with the cooling water passage and fins that connect these cooling pipes, and an annular gas that is arranged on the outer peripheral portion of the membrane tube wall. It is characterized by comprising a distribution pipe portion and an annular gas ejection port which is directed to the furnace opening portion of the refining furnace and blows a gas composed of oxygen or air onto the furnace opening refractory material.

<Operation> According to the above configuration, oxygen or air is blown from the gas ejection port to the furnace opening portion of the refining furnace to burn combustible components generated in the furnace body, thereby solidifying the slag adhering to the furnace opening refractory. It is possible to effectively prevent the damage of the hood and the furnace-mouth refractory by preventing the binding.

Further, since the gas flow pipe portion is arranged on the outer peripheral portion of the membrane tube wall composed of a large number of cooling pipes communicating with the cooling water passage and fins connecting these cooling pipes, It is heat shielded from the high temperature slag in the section and cooled to effectively prevent its burnout and has a long life.

Further, the gas ejection structure and the cooling structure are integrated into the hood, which is simple and compact.

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

FIG. 1 is a sectional view schematically showing an example of a refining device.

In the figure, the furnace opening 1a of the refining furnace 1 is sealed by a hood 2, and a main lance 3 for oxygen blowing is detachably inserted into a central part of the hood 2 through a sealing device (not shown). In addition to being inserted, a sublance (not shown) for temperature measurement and sampling is removably inserted through the side of the sublance via a sealing device similar to the above.

 FIG. 2 is a sectional view showing a main part of the refining furnace 1.

In the figure, a refractory material 4 is attached to the inner peripheral surface of the refining furnace 1, and a hood 2 that can be moved up and down is detachably joined to the furnace opening portion 1a through a flange portion 5, The joint 6 is airtightly held via the seal member 8 by the fastener 6 provided so as to straddle the furnace port 1a and the flange 5.

The hood 2 is formed as a membrane tube wall to protect its heating, and is connected to an annular cooling water passage 5a formed in the flange portion 5. An insertion hole 10 for the lance 3 is formed in the center of the hood 2,
The sealing device is set in correspondence with the lance insertion hole 10.

The joint 7 between the furnace port 1a and the flange 5 has a third
As shown in the drawing, a jet port 12 for oxygen A is provided, and this jet port 12 is directed to the furnace-port refractory 4a of the refining furnace 1.

That is, as shown in FIG. 4, for example, the jet outlets 12 are annular plate members that are arranged so as to face each other with a predetermined space therebetween.
12a and 12b, and a pipe portion 12c is integrally formed on the upper ends of these plate materials 12a and 12b.
Is supplied to blow the oxygen A onto the entire circumferential surface of the furnace-mouth refractory 4a from the jet port 12.

As shown in FIG. 4, the plate members 12a and 12b forming the gas ejection port 12 are penetrated by a large number of cooling pipes 11 each having a set gap connected by fins 13. Membrane tube wall 9 mentioned above with pipe 11
Is configured.

As described above, since the hood 2 is formed as the membrane tube wall 9, the furnace opening refractory 4a is cooled by the membrane tube wall 9 and the smelting furnace 1 is cooled.
The slag containing the metal and the iron component in the gas B discharged from the furnace port 1a of No. 1 tries to adhere.

However, since oxygen A is blown to the furnace-mouth refractory 4a, combustible components such as CO gas and H2 gas generated in the furnace burn to generate heat, and heat the furnace-mouth refractory 4a. It is prevented from being cooled by the membrane tube wall 9. Therefore, it is possible to effectively prevent the deposits such as the ingot and the slag containing the iron component in the gas B discharged from the furnace port 1a from solidifying on the furnace port refractory 4a.

Even if the deposit adheres to the furnace-mouth refractory 4a, it can be melted by the heat generated by the combustion of the combustible components and dropped into the furnace body 1 to effectively prevent its growth. .

Therefore, after raising the hood 2, it is possible to smoothly achieve the tilting of the furnace body 1 along the locus shown by the imaginary line a in FIG. Damage can be effectively prevented.

Moreover, the heating of the furnace-mouth refractory 4a is extremely economical because it effectively burns combustible components such as CO gas and H2 gas generated inside the furnace body 1. In particular, it is more economical to use air instead of oxygen A.

Further, the gas flow pipe portion 12c has a cooling water passage 5a.
Since it is arranged on the outer peripheral portion of the membrane tube wall 9 composed of a large number of cooling pipes 11 communicating with the cooling pipe 11 and fins 13 connecting the cooling pipes 11 to each other,
It is thermally shielded from the high temperature slag in 1a and cooled, effectively preventing its burnout and having a long life.

Further, the jetting structure of the gas A and the cooling structure thereof are integrally incorporated in the hood 2 and are simple and compact.

Although the refining apparatus is applied to the general refining furnace 1 in the above-mentioned embodiment, the heating means for the furnace-mouth refractory 4a is a vacuum degassing container (not shown) such as RH method or VOD method. Needless to say, it may be applied to the case of refining the molten metal using the main lance 3 and the sub lance in ().

<Effects of the Invention> According to this invention, when a gas ejection port for blowing a gas composed of oxygen or air is provided to the furnace mouth refractory of the refining furnace, and oxygen or air is blown to the furnace mouth refractory of the refining furnace,
Combustible components consisting of CO gas and H2 gas generated in the furnace burn to generate heat, the furnace throat refractory is heated, and slag containing ingots and iron components in the gas discharged from the furnace mouth It is possible to effectively prevent the deposits of the above from solidifying to the furnace-mouth refractory, and even if the above-mentioned deposits solidify to the furnace-mouth refractory, they are melted by the heat generated by the combustion of the combustible components. It can be dropped into the furnace body and its growth can be effectively prevented.

Therefore, the movement of the furnace body can be smoothly achieved, and it is possible to provide a refining device in which there is no fear of damage to the hood or the furnace-mouth refractory.

Further, according to this invention, since the gas flow pipe portion is arranged on the outer peripheral portion of the membrane tube wall including the cooling pipe communicating with the cooling water passage and the fins connecting the cooling pipes, Part is heat shielded from the high temperature slag and is cooled to prevent its burnout and has a long service life. Furthermore, the gas ejection structure and its cooling structure are integrated into the hood to be simple and compact. .

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a refining device, FIG. 2 is a sectional view of an essential part of the refining device, and FIG. 3 is a sectional view of an essential part showing an example of a refining device according to the present invention. FIG. 4 is a perspective view of the main part. 1 ... Furnace body, 1a ... Furnace mouth part, 2 ... Hood, 4 ... Refractory material, 4a ... Furnace mouth refractory material, 5 ... Flange part, 5a ... Cooling water passage, 9 ... Membrane tube Wall, 11 ... Cooling pipe, 12 ... Gas outlet, 12c ... Gas distribution pipe part, 13 ... Fin, A ... Jet gas, B ... Exhaust gas.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Yajima 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory (72) Ken Takiura Higashikawasaki, Chuo-ku, Kobe-shi, Hyogo 3-1-1 1-1 Kawasaki Heavy Industry Co., Ltd. Kobe factory (72) Creator Satoshi Tatsuda 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture Kawasaki Heavy Industry Co., Ltd. Kobe factory (72) Inventor Yukihiko Takaza 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Inside Kawasaki Heavy Industries Ltd. (72) Inventor, Sumio Sato 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Inside Kawasaki Heavy Industries Ltd. 56) References JP-A-61-257411 (JP, A) JP-A-55-3597 (JP, A) Actually opened 61-145297 (JP, U) Actually opened 59-57 558 (JP, U) Actual public Sho 59-2477 (JP, Y2)

Claims (1)

(57) [Scope of utility model registration request] 1. A gas discharged from the furnace opening of the refining furnace, comprising a refining furnace having a refractory attached to the inner peripheral surface thereof, and a hood vertically movable at the furnace opening of the refining furnace. In a refining device configured to collect the above through the hood,
The hood has an annular flange portion in which a cooling water passage is formed inside and is detachably attached to the furnace opening portion, and a large number of cooling pipes fixed to the flange portion and communicating with the cooling water passage, A membrane tube wall consisting of fins connecting these cooling pipes, an annular gas distribution pipe portion arranged on the outer peripheral portion of the membrane tube wall, and directed toward the furnace opening portion of the refining furnace The furnace-mouth refractory is heated by heating the furnace-mouth refractory by combusting the combustible components generated in the furnace body with the gas from the gas-fired mouth. A refining device characterized by being configured as described above.