KR100861205B1 - Method for operating life enhancement refractories impeller kanvara reactor - Google Patents

Abstract

An operating method for extending service life of kanvara reactor impeller refractories is provided to reduce manufacturing costs of molten steel, reduce operation loads of operators, and improve productivity by adhering hot metal slag to the kanvara reactor impeller, thereby improving the service life of the kanvara reactor impeller. An operating method for extending service life of kanvara reactor impeller refractories comprises: a step(S12) of transmitting a lifting signal to a lifting motor such that a controller lifts an impeller when a hot metal ladle is loaded into a kanvara reactor; a step(S14) of allowing the controller to determine if the impeller has reached near a part of the hot metal ladle at which an upper cooling nozzle is installed; a step(S16) of stopping the impeller above the hot metal ladle and opening an automatic valve if the impeller has not reached near the part of the hot metal ladle at which the upper cooling nozzle is installed; a step(S18) of allowing the controller to open the automatic valve, thereby controlling a flow control valve to control a flow amount; a step(S20) of transmitting a signal for rotating an impeller motor when the flow control valve controls the flow amount; a step(S22) of allowing the controller to cool the impeller through a cooling gas supplied by the cooling nozzle; a step(S24) of transmitting a signal for allowing the controller to close an automatic valve by sensing that a temperature of the impeller is lowered to a predetermined temperature or less; a step(S26) of allowing the controller to stop the rotation of the impeller motor and order the descent of the lifting motor; and a step(S30) of performing an operation of excluding slag of the hot metal ladle when the impeller is deviated from the cooling position.

Description

Method for operating life enhancement refractories impeller kanvara reactor}

The present invention relates to a method of extending the life of an impeller in a KAL process to remove sulfur (S) in the molten iron by pretreatment of the molten iron in the steelmaking process, and the treated impeller is cooled, and the molten slag is impregnated in the molten iron slag. The present invention relates to a KAL impeller refractory life extension operation method, which is attached to a shell to extend the life of the impeller.

In general, in the conventional desulfurization method of molten iron, KR (kanvara reactor) formula for rotating the impeller into the molten iron as a device for imparting agitation force to the molten iron has been used.

This is a method of injecting a bulk desulfurization agent from the top, the stirring force itself is large, the reaction efficiency is excellent, but there is a disadvantage in that a separate treatment vessel is required and the maintenance cost of the facility is high.

In addition, in the conventional KAL operation, when the molten iron ladle 2 arrives at the corresponding position, when the molten iron ladle (TLC) transfers the molten iron to the molten iron ladle (2), the molten iron ladle (2) When moving to this KAL facility, when the rotation signal is transmitted by the impeller motor 11, the raising / lowering motor 7 will descend | fall.

Thereafter, when the elevating motor 7 reaches the starting position, a degassing agent is added to perform the treatment work, the rotation speed of the impeller, the impeller moves, and the treatment work is performed. When the treatment work is finished, the slag is excluded. And a series of tasks to charge the converter.

At this time, the outside of the impeller (2) is made of refractory, the inside thereof has a tubular structure in order to prevent the temperature rise during the treatment operation, it is cooled by a fluid such as air.

The manufacturing process of the impeller has a problem that takes a lot of manufacturing process because it goes through the step of forming a refractory by using a mold on the iron structure of the impeller, drying the water, drying the refractory to a high temperature .

As the impeller rotates in the molten iron, the refractory is burned out by mechanical erosion while contacting the molten iron, and the life of the refractory is charged into the converter by controlling the level of sulfur targeted to the molten iron in the molten iron. When you do it is calculated once and use 150 ~ 200 times.

Therefore, when the life of the impeller is shortened, the production cost of the molten steel increases due to the increase in the unit of refractory, and the replacement time takes more than 3 hours when the impeller is replaced, so that the productivity of the molten steel is lowered.

In addition, when the life of the impeller is short, a large number of personnel are required in the impeller manufacturing process, the replacement cycle of the impeller is shortened, causing a problem that the work load of the operator increases.

The present invention has been made to solve the conventional problems as described above, by extending the life of the impeller by attaching the molten iron slag to the impeller of the KAL to increase the productivity of the refractory life, to reduce the production cost of molten steel, reducing the work load of workers The purpose is.

As a technical configuration for achieving the above object, the present invention, in the KEL impeller refractory life extension operation method, (a) when the k ladle inlet, the controller raises the lifting signal to the lifting motor to raise the impeller Transmitting (S12); (b) determining whether the impeller reaches a vicinity in which the upper cooling nozzles of the molten iron are installed (S14); (c) the controller stopping the impeller at the top of the molten iron ladle to open the automatic valve (S16); (d) controlling the flow rate control valve to adjust the flow rate by allowing the controller to open the automatic valve (S18); (e) the controller transmitting a signal for rotating the impeller motor when the flow control valve controls the flow rate (S20); (f) the control unit cooling the impeller through the gas cooling gas supplied by the cooling nozzle (S22); (g) the controller detecting a temperature of the impeller falling below 1000 degrees and transmitting a signal to close the automatic valve (S24); (h) controlling the controller to cause the descending motor to descend while stopping rotation to the impeller motor (S26); And (i) proceeding to exclude the slag of the molten iron ladle when the impeller is out of the cooling position (S30).

In the present invention, the step (d) is characterized in that the flow rate is calculated and controlled through the formula y = 0.01x × (-7) (x = molten iron temperature, y = cooling gas flow rate).

According to the KAL impeller refractory life extension operation method as described above, the present invention can improve the life of the impeller to obtain practical effects such as reducing the cost of manufacturing molten steel, reducing the work load of the worker, improve productivity.

Hereinafter, with reference to the drawings will be described in detail with respect to the operation method of refractory life of the impeller refractory.

1 and 2 is a view showing a KAL impeller refractory device according to the present invention.

1 and 2, the impeller 3 includes a cooling nozzle 25, a cooling line 24, a flow control valve 23, and an automatic flow rate valve 22. The cooling nozzle 25 is installed at the upper part of the molten iron ladle 2 so as to be cooled, and the cooling line 24 is installed at the rear end of the cooling nozzle 25, and the flow control valve is provided at the cooling line 24. It consists of 23 and the automatic valve 22. As shown in FIG.

Around the impeller 3, a controller 21 for adjusting the rising and falling of the impeller 3, an impeller motor 11 for rotating the impeller 3, and a rising and falling charge for the lifting and lowering of the impeller 3. The lowering motor 7 is comprised.

The control unit 21 is connected to each other by the impeller motor 11 for rotating the impeller 3 and the elevating motor (7) responsible for raising and lowering the impeller (3) to the inside to coat the refractory. .

Figure 3 is a view showing a flow chart according to the KAL impeller refractory life extension operation according to the present invention.

As shown in FIG. 3, in the KAL impeller refractory life extension operation method, when the KAL ladle is introduced (S10), the controller 21 is lifted up and down the lifting motor 7 to raise the impeller 3. Transmit the signal (S12)

Next, the rising and lowering motor 7 which receives the rising signal rises and performs a step of determining whether the upper cooling nozzle 25 of the available impeller 3 is reached near the installation. S14)

As a result of the determination in step S14, when the impeller 3 does not reach the vicinity where the upper cooling nozzle 25 of the molten iron ladle 2 is installed, the step S12 is performed again. 21) to send a stop signal (S16).

At this time, the temperature of the impeller is 1300 degrees or more above the temperature of the molten iron and molten slag attached while passing through the slag layer is the same as the temperature of the impeller (3) because the slag does not adhere to the impeller (3) It will fall as it flows.

When the impeller 3 stops at the upper portion of the molten iron ladle 3 (S16), the controller 21 performs the step of opening the automatic valve 22.

When the automatic valve 22 is opened, the flow control valve 23 is opened to adjust the flow rate. (S18)

The flow rate adjusting step is different depending on the temperature of the molten iron, which is calculated by the controller as shown in the following equation (1).

[Equation 1]

y = 0.01x × (-7)

(x = molten iron temperature, y = cooling gas flow rate)

Next, the controller 21 transmits a signal so that the impeller motor 11 rotates when the flow control valve 23 controls the flow rate.

At this time, the gas cooling gas supplied by the cooling nozzle 25 while rotating rotates the impeller (S22), and when the temperature of the impeller 3 falls below 1000 degrees, the controller 21 automatically switches the valve 22. ), And the automatic valve 22 is closed. (S24)

When the automatic valve 22 is closed, the controller 21 issues a command to the elevating motor 7 to stop the rotation of the impeller motor 11 and lowers it. (S26)

The descending motor of the step S26 is different in the descending depth according to the amount of molten iron, which is controlled by the controller 21.

At this time, when the impeller 3 reaches the surface portion, the controller 21 transmits a signal for raising the impeller 3 (S28).

At this time, the slag of 1300 degrees or more adheres to the surface of the impeller of 1000 degrees or less and hardens. At this time, the slag attached to the surface of the impeller 3 is hardened to reinforce the impeller.

Next, if the impeller 3 is out of the cooling position proceeds to the exclusion of the slag of the molten iron ladle (S30).

The following is a reference table for explaining an embodiment of the present invention.

Table 1

As shown in the embodiment, by coating the impeller, the life of the impeller was 150 to 200 times, which is used around 300 times.

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.

1 is a view showing a conventional KAL impeller refractory device.

2 is a view showing a KAL impeller refractory device according to the present invention.

Figure 3 shows a flow chart according to the KAL impeller refractory life extension operation according to the present invention.

<Explanation of symbols for main parts of the drawings>

1: Transfer Balance 2: Charter Ladle

3: impeller 7: lifting motor

11 impeller motor 21 controller

22: automatic valve 23: flow control valve

24: cooling line 25: cooling nozzle

Claims (2)

(a) when the ladle is inserted into the cable, the controller transmits a rising signal to the lifting motor to raise the impeller (S12); (b) the controller determining whether the impeller has reached the vicinity where the upper cooling nozzles of the molten iron are installed (S14); (c) if the impeller does not reach the vicinity of the upper cooling nozzle of the molten iron ladle, the step of stopping the impeller at the upper portion of the molten iron ladle to open the automatic valve (S16); (d) controlling the flow rate control valve to adjust the flow rate by allowing the controller to open the automatic valve (S18); (e) transmitting a signal to rotate the impeller motor when the flow control valve controls the flow rate (S20); (f) the control unit cooling the impeller through the gas cooling gas supplied by the cooling nozzle (S22); (g) the controller transmitting a signal to close the automatic valve by detecting that the temperature of the impeller falls below a predetermined temperature (S24); (h) causing the controller to descend to give a command to the elevating motor while stopping rotation to the impeller motor (S26); And (i) if the impeller is out of the cooling position proceeding the operation excluding the slag of the molten iron ladle (S30); caal impeller refractory life extension operation method comprising a. The method of claim 1, In step (d), y = 0.01x × (-7) (x = molten iron temperature, y = cooling gas flow rate) is calculated so that the flow rate is controlled so that the impeller refractory life extension operation method.

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