KR100915093B1 - A Tapping method For Tap Hole Of Blast Furnace - Google Patents

Abstract

The present invention relates to a method for expanding the furnace exit port which is easy to start the ship, and more particularly, after tapping the melt accumulated in the furnace by one of the four outlets by the opening machine, the tapping bar ( Tapping Bar) 60 ~ 65 The present invention relates to a method for expanding the outlet of a smelting furnace that can be easily pulled out through an outlet structure that can be easily closed.

In order to achieve the above object, the present invention provides a method for expanding an outlet of an easy-to-use furnace, by attaching a molding material to mold the outlet, turning a mud gun, pressing the surface of the outlet, and using a hole. Confirming the outlet center to be enlarged and applied, and excavating the outlet surface through a tapping bar; Forming a tap hole surface by a nozzle and a nozzle tip coupled to the mud gun to fit a cylinder diameter enlargement; And a fixing pin is fastened so that the tap hole is enlarged to fasten the nozzle and the nozzle tip to the excavated tap hole surface. Characterized in that it comprises a.

Description

A Tapping method For Tap Hole Of Blast Furnace

The present invention relates to a method for expanding the furnace exit port which is easy to start the ship, and more particularly, after tapping the melt accumulated in the furnace by one of the four outlets by the opening machine, the tapping bar ( Tapping Bar) 60 ~ 65 The present invention relates to a method for expanding the outlet of a smelting furnace that can be easily pulled out through an outlet structure that can be easily closed.

In general, the operation of discharging the melt (melt + slag) accumulated in the optical path is referred to as the tapping operation.

The mud gun device that closes the exit port filled with the mud material in the exit hole when the exit is completed after the departure process during the process of the exit operation, the precise pressing of the exit surface and the mud gun nozzle tip (Nozzle Tip) When done, ensure that the exit is closed securely without spillage.

In the conventional mud gun device and structure, the mud gun is squeezed by the swivel cylinder to the turning tap hole and the mud material is filled into the tap hole by the ramming cylinder.

At this time, a tap opening is formed by a mud gun nozzle tip, and the tap opening is formed to have an inner diameter of 150 mm and an outer diameter of 280 mm.

Currently, the furnace has increased in size from 3950㎣ to 4350㎣ to 4600㎣ in 3800㎣ class blast furnaces. It is essential to use.

However, the mud gun inside diameter and outside diameter 280mm, which are the exit and exit closure devices, are rapidly expanded due to the tearing of the starting hole, which leads to a situation in which it is impossible to continue the exit. There is a problem.

Due to the above problems, the instability of the yellowing brings about a decrease in productivity as well as a second problem, leading to a decrease in the operation index of all the furnaces.

In addition, the closing of the exit port is not well done, which affects the life of the furnace due to the decrease in the depth of the exit port.

In addition, the molten iron (melting and slag) formed by the iron ore and the coke reduction reaction in the furnace is discharged through the tap opening, and the tap opening is carried out using an opening hole.

At this time, in order to smoothly discharge the melt accumulated in the furnace, the tapping bar is used according to the production amount. When the production amount is 9000 ton, the tapping bar is 60 65 at 10,000 tons Using the open hole, the melt is discharged through the through hole of the tap.

At this time, the mud gun and the exit port diameter are 150 and the outer diameter is 280 mm. In case of abnormal use, the expansion of the starting point occurs early, which causes the exit opening to be torn, which leads to premature closing work. The maintenance of the exit port and the depth of the depth caused problems with the second and third exit ports.

The present invention is to solve the above problems, an object of the present invention is to prevent the stable operation of the productivity increase according to the content of the furnace, and to prevent this, by developing a tap opening suitable for the contents of a large blast furnace The purpose is to improve productivity and to provide a stable exit port.

As a technical configuration for achieving the above object, the present invention provides a method for expanding an exit port of a smelting furnace which is easy to go out. Compressing the front surface, and using the opening machine to expand and apply the center of the outlet, excavating the outlet surface through a tapping bar (S10); (b) forming a tap hole surface by a nozzle and a nozzle tip coupled to the mud gun and adapted to fit the cylinder diameter (a, b) enlargement (S20); And (c) expanding the outlet by fastening a fixing pin to enlarge and fasten the nozzle and the nozzle tip to the excavated outlet surface (S30). Characterized in that it comprises a.

As described above, the present invention forms a tap opening for a large furnace, thereby opening the tap opening 65 Opening work is possible as described above has the effect of increasing the output by enabling the discharge of the melt more than 10,000 tons per day.

In addition, the present invention has the effect of stabilization of the operation due to the yellowing stability due to the prevention of early closing operation of the outlet by preventing the early expansion of the outlet by the discharged melt.

In addition, the present invention prevents the tearing of the outlet opening to prevent the depth of the outlet opening due to spillage during the closure of the outlet opening to prevent blood vessels and cracks in the outlet opening contributes to the life of the old age according to the stabilization of the outlet and maintain a stable departure time Refractories can be saved.

In addition, the present invention has the effect of improving all the operation index of the large sized furnace by building a stable starting and exit work according to the high commissioning cost operation.

1 is a view showing a tap surface excavation work method according to the present invention.

Figure 2 is a view to form a melting point exit port easy to go according to the invention.

Figure 3 is a flow chart showing a method for expanding the outlet of the easy smelting furnace according to the present invention.

<Explanation of symbols for main parts of the drawings>

2: exit 3: mud gun

4: nozzle 5: nozzle tip

3: molding material 10: fixing pin

Hereinafter, with reference to the drawings it will be described in detail with respect to the expansion of the outlet of the furnace easy to go out.

1 is a view showing a tap surface surface excavation work method according to the present invention.

As shown in Fig. 1, the surface excavation operation method of the exit port, by attaching a molding material 9 that can form the exit port, by turning the mud gun 3 to form the exit port, The mud gun is fixed to the outlet face 2 for about 20 minutes so that the outlet face 2 can be formed.

The outlet surface 2 is fixed by using coke oven gas (Cokes Oven Gas) to be fixed, and after completion of the mud gun (3) is retracted and placed in the correct position.

The enlarged exit port surface 2 is completely dried by using coke oven gas, and after completion, the center of the exit port 1 is confirmed by using an opener, and the exit port 1 has an inner diameter of 160 mm and an outer diameter of 290 mm. Tapping bar 60 Even in abnormal use, it can be normally closed by normal outgoing, and has a stable exit port that can be expanded and used through tapping bars suitable for operation of high outgoing ratio compared to the contents due to the enlargement of the furnace.

2 is a view for forming the surface of the melting furnace exit port easy to go out according to the present invention.

As shown in FIG. 2, the hydraulic system according to the expansion of the exit port is examined, and the mud gun 3 is applied after applying the system suitable for the expansion of the mud gun 3 and the cylinder diameters a and b based on the result. The exit nozzle is formed by the enlarged nozzle 4 and the nozzle tip 5 coupled to the &lt; RTI ID = 0.0 &gt;

At this time, the molding operation is performed in advance in order to enlarge the molded opening.

The molding operation is to dismantle the existing exit port, excavate the surface 30mm deep and the outer diameter 340mm, and then expand the exit port according to the angle of the mud gun 3 and the mud gun nozzle tip 5 when expanding the exit port. The mud gun 3 is adjusted to maintain a constant pressing force. At this time, the adjustment of the angle of the mud gun 3 lowers the body of the mud gun 3, and raises the portion of the nozzle tip 5.

Hereinafter, the operation ratio of the installation and the use force according to the nozzle 4 diameter will be described.

The mud gun (3) and the swivel drive have a torque of 1300 KNm at a constant pressure of 315 bar, and the boom length is 3.91m.The maximum force (F) of the current equipment is 1300KNm / 3.91m. = 332 KN.

At this time, P = 20,000,000 N / m 2 A = 0.01767 m 2 at a diameter of 150 mm and a pressure of 200 bar of the nozzle 4, so the force F per unit area has a force of <F = P * A> = 353 250 N, that is, F = 353 KN.

On the basis of the above, looking at the ratio of the operating force and the installation force according to the diameter of the nozzle (4),

(332KN / 353KN) = 94% at 150mm, (332KN / 402KN) = 82% at 160mm

At 170mm (332KN / 453KN) = 73%, at 180mm (332KN / 509KN) = 65%.

As a result of the test, the ratio of the facility and the force acting according to the nozzle diameter can be used up to 82%. However, when the out of the outlet is abnormal, the ratio of the 82% causes problems in the pressing force of the outlet. It is difficult to expand the exit.

Therefore, the inner diameter (a) of the mud gun (3) cylinder diameter (a, b): 250 mm rod (b): 180 mm length: 1050 mm cylinder inner diameter (a): 265 mm rod (b): 190 mm length: 1050 mm It solves the problem of compressive force when expanding the outlet by increasing the ratio of force by applying the enlargement.

Looking at the rate of increase when the mud gun (3) cylinder diameter a, b enlarged,

Since the mud gun swinging cylinder forms a differential circuit, the conventional mud gun (4) cylinder diameters (a, b) are inner diameter (a): 250 mm, rod (b): 180 mm, length: 1050 mm.

Cross-sectional area (A) = 3.14 * (18cm) * 2/4 = 254.3cm2

Since the enlarged mud gun (3) cylinder diameters (a, b) are inner diameter (a): 265 mm, rod (b): 190 mm, length: 1050 mm,

In cross-sectional area (A) = 3.14 * (19 cm) * 2/4 = 283.4 cm 2,

283.4 / 254.3 = 1.114 times increased,

The mud gun (3) Swivel drive has a torque of 1300 KNm at a constant pressure of 315 bar, which is increased by 1.114 times, so the maximum torque rises to (1300 KNm * 1.114) = 1448.2 KNm, so the maximum plant force (F) is 1.114 KNm. /3.91m = 370.3KN will rise.

Therefore, when the mud gun 4 and the cylinder diameters a and b are enlarged, the ratio of the action of the equipment and the use force is

(370.3KN / 353KN) = 104% at 150mm, (370.3KN / 402KN) = 92% at 160mm

The ratio of (370.3KN / 453KN) = 82% at 170mm and (370.3KN / 509KN) = 73% at 180mm.

When the diameter of the nozzle 4 of the mud gun is extended to 160 mm, it has a ratio of force acting on 92% of the equipment, thereby providing a facility basis according to the expansion of the exit port, and based on the nozzle 4 and the nozzle tip 5 ) To be enlarged and fastened so that it can be expanded by fastening pins.

Figure 3 is a flow chart illustrating a method for expanding the outlet of the blast furnace easy to go out according to the present invention.

As shown in FIG. 3, a molding material is attached to mold the exit port, the mud gun is pivoted, pressed onto the exit port surface, and the opening center is confirmed and expanded by using a hole. , Excavating the exit surface through the tapping bar. (S10)

Next, a step of forming the exit port surface by the nozzle and the nozzle tip coupled to the mud gun and expanded to match the expansion of the cylinder diameter (a, b) (S20).

Next, the fixing pin is fastened so that the nozzle and the nozzle tip can be expanded and fastened to the surface of the excavated outlet.

The present invention described above is not limited to the above-described detailed description of the invention and the accompanying drawings, and those skilled in the art can be variously modified without departing from the spirit and scope of the present invention described in the claims below. Modifications and variations are also included within the scope of the invention.

Claims (3)

In the method of expanding the exit of the furnace, which is easy to go out, (a) Attaching a molding material to mold the exit port, turning the mud gun, pressing the exit port surface, and expanding the exit center using an opening machine to open the exit surface through a tapping bar. Excavating (S10); (b) forming a tap hole surface by a nozzle and a nozzle tip coupled to the mud gun and adapted to fit the cylinder diameter (a, b) enlargement (S20); And (c) a step of expanding the outlet by fastening a fixing pin to enlarge and fasten the nozzle and the nozzle tip to the excavated outlet surface (S30); Including, In step (a), When the exit surface is dried through coke oven gas (COG), check the exit center using an opening machine, and expand the exit port to an inner diameter of 160 mm and an outer diameter of 290 mm by tapping bar 60 A method for expanding an outlet of an easy smelting furnace, characterized in that the normal closing by the normal starting is possible even in abnormal use. delete The method of claim 1, In step (b), Disassemble the frame of the existing exit port to expand and shape the exit port, and down the mud gun (3) fuselage to maintain a constant pressing force between the exit port surface and the mud gun nozzle tip according to the mud gun angle when expanding the exit port. A method for expanding an outlet of a smelting furnace which can be easily outgoing, comprising adjusting the mud gun angle by going down and raising the tip of the nozzle tip.