JPH03180423A - Opening and closing device for tap hole of smelting reduction furnace - Google Patents

Abstract

PURPOSE:To allow continuous smelting reduction operations by providing a reaction receiving mechanism on the side wall in the upper part of the tap hole of a furnace, opening the tap hole by a guiding means and a rod for boring and turning a mud gun toward the tap hole after tapping. CONSTITUTION:A base plate 11 is positioned to the front surface of the tap hole 10 at the time of tapping of the smelting reduction furnace. A pawl 29a of a 1st hacker 29 is detained to an upper pin 28 of a reaction receiving fitting 27 provided on the side wall 1b and a pawl 32a of a 2nd hacker 32 is detained to a lower pin 28 '. A 1st truck 15 is moved and is positioned on the extension line of the tap hole 10 and while the rod 20 for boring is turned, a 2nd truck 19 is advanced to open the tap hole 10. The molten iron in the furnace is discharged in the upright state of the furnace body 1. A 1st hydraulic cylinder 26 is operated to turn a mud gun 23 after tapping to push the mud into the tap hole 10 and to close the tap hole 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a device for opening and closing a taphole in a pressurized smelting reduction furnace for melting and reducing iron ore.

"Prior art" Iron ore and carbonaceous material are supplied into a converter type melting reduction furnace containing an iron bath, and the iron ore is melted and reduced by blowing oxygen through a lance from above. Iron bath type melting A method for melting and reducing iron ore using a reduction furnace is known.

FIG. 5 is a schematic vertical sectional view of a converter type pressurized smelting reduction furnace used in this method. As shown in FIG. 5, the melting reduction furnace has a converter type furnace body 1.

A lance 2 inserted substantially vertically into the furnace through the furnace mouth 1a of the furnace body 1, a stirring gas inlet 3 provided on the bottom wall and side wall of the furnace body 1, and a hood 4 that covers the furnace mouth 1a. It consists of a chute 5 for supplying iron ore and a chute 6 for supplying carbonaceous materials such as coal.

A required amount of molten iron is stored in the furnace, iron ore is supplied through a chute 5, and carbonaceous materials such as coal and flux are supplied through a chute 6 into the furnace. Oxygen gas is blown into the slab 8 in the furnace through the lance 2 vertically inserted into the furnace body 1 from the furnace mouth 1a, and nitrogen, etc. is injected into the iron bath 7 in the furnace through the stirring gas inlet 3. Blow in stirring gas.

As a result, the carbon in the molten iron and the carbon in the supplied carbonaceous material react with the oxygen gas blown through the lance 2 to generate CO gas.

The CO gas generated above reacts with excess oxygen gas blown through the lance 2 to become CO2 gas,
Due to the sensible heat of the CO2 gas generated at this time, the iron ore in the molten iron 7 is melted and reduced by the carbon in the carbon material to become molten pig iron. Exhaust gas generated during refining is discharged through an outlet 9 provided in the hood 4, and is used as preliminary reduction gas in a preliminary reduction furnace (not shown).

What is important in the above-mentioned melt reduction method is to improve the degree of oxidation of the gas generated in the reduction furnace, that is, the secondary combustion rate. For this purpose, the inside of the smelting reduction furnace is pressurized to increase the pressure inside the furnace, thereby improving the secondary combustion rate.

[Problems to be Solved by the Invention] When refining is completed in the above-mentioned smelting reduction furnace, conventionally, after removing the hood 4 that covers the furnace opening 1a shown in FIG. 5, the furnace body 1a is tilted and the furnace opening is closed. Hot metal in the furnace was discharged into the ladle from 1a.

For this reason, scouring becomes intermittent and continuous scouring is impossible, so a decrease in smelting efficiency is unavoidable.

Furthermore, as the pressurized state inside the furnace is released during tapping, the inside of the furnace must be pressurized again for the next refining.
There were problems such as the operation for this became complicated and it became difficult to keep the pressure inside the furnace constant.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for opening and closing a tap hole of a pressurized smelter and reduction furnace for continuously performing iron ore smelting and reduction operations in a pressurized smelter and reduction furnace.

[Means for Solving the Problems] The apparatus of the present invention includes a base that is movable toward the taphole provided at the lower part of the side wall of the smelting reduction furnace, and a base that is movable toward the taphole provided at the lower part of the base. an opening mechanism consisting of a guide rail provided horizontally on the guide rail, and a drilling rod rotatable about the axis of the tap hole for opening the tap hole, the opening mechanism being supported by the guide rail so as to be horizontally movable; A horizontal shaft provided at the end of the base on the smelting reduction furnace side is provided with a support metal fitting interposed therebetween.

A closing mechanism consisting of a mud gun for closing the taphole, which is rotatably provided toward the taphole, and a reaction force receiver provided on the side wall of the upper part of the taphole of the smelting reduction furnace. A first plate provided at the end of the base that can be locked to a metal fitting.
The reaction force receiver, which is composed of the shell and the second shell provided at the end of the guide rail, is characterized in that it consists of a mechanism.

Next, the present invention will be explained with reference to one drawing.

FIG. 1 is a schematic front view showing one embodiment of the present invention, FIG. 2 is a schematic side view mainly showing the opening mechanism part in FIG. 1, and FIG. 3 is a schematic side view showing mainly the opening mechanism part in FIG. A schematic plan view showing a mechanism part.

FIG. 4 is an enlarged schematic front view mainly showing the mud gun portion in FIG. 1.

As shown in FIG. 1, a tap hole 10 is provided at the lower part of the side wall 1b of the furnace body 1 of the smelting reduction furnace, which horizontally penetrates the side wall 1b. The tap hole 10 is closed by mud during refining, and is opened by a drilling rod during tapping.

A base 11 provided with such an opening mechanism and a closing mechanism for the taphole 10 is provided so as to be movable toward the taphole 10. The movement of the base 11 is carried out using a hanging fitting 12 attached to the base 11 as shown in FIGS. 1 and 2.
This may be done using a crane or the like, or the base 11
It may also be carried out using a trolley equipped with

A rail 13 is provided on the lower surface of the base 11 in its width direction, and an opening mechanism 14 for opening the tap hole IO is provided on the rail 13 so as to be movable along this. The opening mechanism 14 was fixed to a first truck 15 movable along the rails 13 by wheels 16 and to the lower surface of the first truck 15 via a connecting fitting 17. The base 11 is the tap hole 10
When positioned in front of the tap hole 1.0, the guide rail 18 is located horizontally toward the tap hole 1.0, the second bogie 19 moves along the guide rail 18, and the second bogie 19 has its base end. It consists of an attached drilling rod 20. A motor 21 is mounted on the second truck 19, and a drilling rod 2 is mounted on the second truck 19.
The base end of the motor 21 is attached to the rotating shaft of the motor 21.

Therefore, the drilling rod 20 rotates about its axis due to the opening movement of the motor 21.

A horizontal shaft 22 is attached to the end of the base 11 on the furnace body 1 side. A mud gun 23 having a hydraulic cylinder 35 as a closing mechanism for closing the tap hole 10 is rotatably provided on the horizontal @ 22 via a support fitting 24 . A first hydraulic cylinder 26 is pivoted to a bracket 25 provided on the end of the base 11 on the furnace body 1 side, and the lower end of the rod of the first hydraulic cylinder 26 is connected to a support fitting of the mud gun 23. It is pivoted to 24.

Therefore, by opening the first hydraulic cylinder 26, the mud gun 23 turns vertically about the horizontal shaft 22, and when it turns downward, its tip can be positioned at the tap hole]O. .

As shown in FIGS. 1 and 3, the tap hole 10 of the furnace body 1
On the upper side wall 1b, vertically horizontal pins 28.28
' The reaction force receiver is provided with a metal fitting 27. On the horizontal axis 22 at the end of the base 11.

A central portion of a first hammer 29 having a claw 29a that can be engaged with the upper pin 28 is pivoted. A second hydraulic cylinder 30 is pivotally attached to the bracket 25 provided on the end of the base 1, and the tip of the rod of the second hydraulic cylinder 30 is attached to the other end of the first cylinder 29. is attached to the shaft. Therefore, by opening the second hydraulic cylinder 30, the first shell 2
9 rotates about the horizontal shaft 22, and the claw 29a of the first hammer 29 and the reaction force receiver are attached to and detached from the upper pin 28 of the metal fitting 27.

A horizontal shaft 31 provided at the end of the guide rail 18 on the furnace body 1 side has a claw 32a at one end that can be engaged with the lower pin 28'.
A second core 32 having a diameter is pivotally attached. A third hydraulic cylinder 34 is pivotally attached to a bracket 33 provided on the end of the guide rail 18, and the tip of the rod of the third hydraulic cylinder 34 is pivoted to the other end of the second shell 32. It is worn. Therefore, as the third hydraulic cylinder 34 opens, the second tooth 32 rotates about the horizontal shaft 31, and the claw 32a of the second tooth 32 is attached to and detached from the lower pin 28' of the metal fitting 27.

The reaction force receiver mentioned above is the metal fitting 27. 1st heart 29 and 2nd
The reaction force receiving mechanism is constituted by the shell 32 and the like.

[Operation 1] When the refining in the smelting reduction furnace is completed and the iron is tapped, the base 11 is positioned over the entire surface of the tap hole 10 of the furnace body 1. Then, by the operation of the second hydraulic cylinder 30, the first hammer 2
The reaction force receiver provided on the side wall 1b of the furnace body 1 is engaged with the upper pin 28 of the metal fitting 27, and the claw 29a of the second shell 32 is engaged with the upper pin 28 of the metal fitting 27.
1. The reaction force receiver is engaged with the lower pin 28' of the metal fitting 27.

Next, the first cart 15 is moved along the rail 13 in the width direction of the base 11, and the drilling rod 20 is moved.

Position it correctly on the extension line of the tap hole 10 of the furnace body l. Then, by the rotation of the motor 21, the drilling rod 20 is
The second truck 19 is advanced toward the tap hole 10 along the guide rail 18 while rotating about its axis.

Thus, the tap hole 10 of the furnace body 1 is opened, and with the furnace body 1 standing upright, the hot metal in the furnace passes through the tap hole 10 and is discharged into a ladle (not shown).

After tapping is completed, the second truck 19 is moved backward, and the first truck 15 is moved in the width direction of the base 11, and the first truck 19 is moved backward.
Trolley 15. Guide rail 18. The second truck 19 and the drilling rod 20 are laterally shifted from the front position of the tap hole 10.

Next, the first hydraulic cylinder 26 is operated to rotate the mud gun 23 and position its tip at the tap hole 10, as shown in FIG. Then, the hydraulic cylinder 35 of the mud gun 23 is operated to push the mud in the mud gun 23 into the tap hole 10, thereby closing the tap hole 10.

The taphole 10 is formed by pushing the drilling rod 20 as described above.
The reaction force when the hole is opened and the reaction force when the tap hole 10 is closed by the mud gun 23 are both caused by the reaction force caused by the metal fitting 27, the first shell 29, the second shell 32, etc. The receiver is received by the furnace body 1 by a mechanism.

After the taphole 10 is completely blocked, the mud gun 23 is returned to its original position, and the first shell 29 and the second shell 3 are closed.
2, the reaction force receiver is removed from the upper pin 28 and lower pin 28' of the metal fitting 27. Then, the base 11 is moved to a position away from the furnace body 1 and left on standby at that position.

As described above, according to the present invention, hot metal can be discharged from the furnace at the end of scouring without tilting the furnace body, thus allowing continuous operation.

[Effects of the Invention] As described above, according to the present invention, when iron ore is smelted and reduced in a pressurized smelting reduction furnace, during tapping,
There is no need to tilt the furnace body as in the past, and it becomes possible to tap iron through the tap hole provided at the bottom of the furnace body. Therefore, continuous refining becomes possible and refining efficiency improves. Furthermore, since the pressurized state in the furnace is not released during tapping, the pressure in the furnace can be kept almost constant. As described above, the present invention brings about many industrially useful effects.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing one embodiment of the present invention, Fig. 2 is a schematic front view showing one embodiment of the invention;
The figure is a schematic side view mainly showing the opening mechanism part in Figure 1, Figure 3 is a schematic plan view mainly showing the reaction force receiver mechanism part in Figure 1, and Figure 4 mainly shows the mud gun part in Figure 1. The enlarged schematic front view and FIG. 5 are a schematic vertical sectional view of the pressurized melting reduction furnace. In the drawing, 1
...Furnace body, 2...Lance, 3...Gas inlet, 4...Hood, 5.6...Chute,
7... Iron bath, 8... Slag, 9...
Discharge port, 10... Tapping port, 11... Base. 12... Hanging bracket, 13... Rail, 14...
...Opening mechanism, 15...First truck, 16...
Wheels, 17... Connecting fittings, 18... Guide rails, 19... Second bogie. 20... Drilling rod, 21... Motor, 22...
...Horizontal shaft, 23...Mud gun, 24...Supporting metal fittings, 25...Bracket, 26...First hydraulic cylinder, 27...Reaction force receiver is metal fitting, 28.28'... Pin, 29...first shell, 30...second hydraulic cylinder, 31...horizontal axis, 32...second shell. 33... Bracket, 34... Third hydraulic cylinder,
35... Cylinder for mud gun.

Claims (1)

[Claims] 1. A base movable toward the taphole provided at the lower part of the side wall of the smelting reduction furnace, a guide rail provided horizontally at the lower part of the base toward the taphole, and the guide rail. To,
an opening mechanism consisting of a drilling rod that is supported horizontally and is rotatable about its axis for opening the tap hole; and an opening mechanism provided at the end of the base on the smelting reduction furnace side. a closing mechanism consisting of a mud gun for closing the tap hole, which is rotatably provided on the horizontal shaft of the tap hole through a support fitting toward the tap hole; and the tap hole of the smelting reduction furnace. A reaction force consisting of a first hacker provided at the end of the base and a second hacker provided at the end of the guide rail, which can be locked to a reaction force receiving metal fitting provided on the upper side wall. 1. A taphole opening and closing device for a smelting reduction furnace, comprising a receiving mechanism.