KR20010060706A - Pressure control apparatus for iron notch of blast furnace - Google Patents

Abstract

PURPOSE: An apparatus for controlling the pressure of a tap hole of a blast furnace and capable of controlling cylinder pressure of a closing device in accordance with a size of a tap hole and stopping an advance of a cylinder when it attains maximum pressure is provided, which can prevent a rise in pressure and an outflow generated during closing and an accident in advance. CONSTITUTION: This apparatus for controlling the pressure of a tap hole comprises a pressure detecting part(20) installed in a body of a closing device(14) to detect the pressure of a tap hole(12) of a blast furnace(1) and the closing device; a plurality of pressure reducing valves(28) connected to a hydraulic line to drain under each set pressure; a pressure switch(22) for selecting the pressure reducing valve; and a control part(21) for shutting off under maximum pressure.

Description

PRESSURE CONTROL APPARATUS FOR IRON NOTCH OF BLAST FURNACE

In the present invention, the discharge phenomenon occurs when the exit hole is enlarged when the exit hole is closed after the discharge molten water is discharged out of the furnace after the molten metal is reduced in the furnace, and the pressure rise occurs when the exit hole is formed small. To prevent this, the diameter of the starting hole should be constant at least when the exit opening is closed to prevent the pressure rise at the exit, and when the closing lever is operated continuously at the operation console of the exit, the gap between the exit and the closing tip The present invention relates to a blast furnace outlet pressure regulating device capable of maintaining a volume velocity in molten production by preventing mud material from leaking out.

In general, the molten metal reduced and melted in the blast furnace 11 is formed by drilling a hole in the outlet 12 using a bit of an opener, and then forming molten material, namely, molten water and slag at the bottom of the blast furnace 11 through an opening operation. ) Are discharged together out of the blast furnace 11 by the pressure in the furnace.

And, because the slag flows over the molten iron layer in the large turbidity 15 due to the difference in specific gravity, the slag does not pass through the SKIMMER and flows to the slag runner 17, and the large specific water is separated into the bottom of the skimmer and separated. The molten water reaches the raceway through the molten water runway 16 and is transported to the forklift 18.

At this time, the repaired water is to be able to check the repair amount and the starting speed by the weighing machine (18a) installed in the lower rail of the forklift (18).

And after a certain time elapses after the departure, if the deduction of the outlet (12) the phenomenon that the wind flows through the air through the melt and the wind is discharged to the outlet at the same time as the melt in the furnace decreases, the cover covering the exit port and large bathway (Not shown), and after turning the closure (MODGUN) (14) to join the outlet surface, the mud material 29 of the closure 14 is filled in the outlet 12 to the outlet 12 Enclose it.

Filling method of the outlet opening 12, after closing the closure 14 to the standby position in the closing device 14 operation DESK 30 of the outlet opening 12 and filling the mud material 29 and then the outlet opening ( 12) During closing operation, the closing device 14 is pivoted forward to the exit port 12 surface side, and the joining check surface LAMP is turned on one second after the closing confirmation lamp LAMP of the exit device 14 and the exit port 12 is turned on. After recognizing that the cylinder of the closure 14 is moved forward by the operation DESK 30, the mud material 29 inside the closure is pushed into the outlet 12 to advance the cylinder at the operation desk 30 when the expected filling amount is reached. The closure is completed by stopping the lever.

And, opening the exit port in the other direction so that the continuous work is made.

However, when the exit opening 12 is closed, the diameter of the opening opening 12 is small and the closing pressure rise causes the pressure rise and discharge of the opening opening 12 to occur, and the opening opening pressure when the opening 12 is closed. In the event of an outflow due to the rise, the exit surface must be repaired, but the work is performed at the upper part of the main bath (15).

In addition, there were many problems such as the delay of opening time at the next departure and the burden of work load due to the maintenance and the use of saving money during the maintenance of the booth. .

The present invention is to solve such a conventional problem, the object is that the pressure at the time of closing the exit port according to the size of the exit diameter of the blast furnace is detected differently, the cylinder pressure of the closure is adjusted according to the size of the exit port, the maximum pressure Stopping the cylinder forward when reaching to prevent the pressure rise and outflow occurring in closing, and prevent the exit surface repair due to the outflow, and in the outlet wall during the maintenance work due to the outflow caused by closing the outlet The present invention provides a blast furnace outlet pressure control device that can prevent the occurrence of gas poisoning in advance.

1 is a schematic view showing a conventional blast furnace exit closure device

Figure 2 is a schematic diagram showing the exit closure device in accordance with the present invention

Figure 3 is a block diagram showing a control state of the exit closure according to the invention

Figure 4 is a hydraulic configuration according to the present invention

5 is a closed pressure detection and pressure control state diagram of the present invention

Explanation of symbols on the main parts of the drawings

11 ... Blast furnace 12 ... Exit

14 ... Closer 15 ... Large Bath

18a ... Weighing machine 20 ... Mudgun pressure detection stage

23.Electronic switching valve 24.Hydraulic pump

32 Pressure transmitter 34 Pressure detection conversion unit

As a technical means for achieving the above object, the present invention, the pressure detection end is provided in the closure body to detect the pressure in the exit port and the closure of the blast furnace,

A plurality of pressure reducing valves connected to a hydraulic line for driving the closing cylinder and installed to drain at each set pressure;

A pressure switch connected to the hydraulic line and installed to select a pressure reducing valve when a predetermined pressure is reached;

It is connected to the pressure detecting end and the pressure switch, and compares the signals of both sides, and consists of a control unit which is installed to shut off the hydraulic pressure at the highest pressure, by providing an outlet pressure control device of the blast furnace to prevent the pressure rise when closing the exit port. .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in Fig. 2, a detection stage 20 configured as an indicator connected to the cylinder and one side thereof is provided so as to detect the pressure applied to the closure 14 at the body end of the closure 14 body.

In addition, the pressure in the closing device 14 is detected in advance and transmitted to the control unit 21. In the detection stage 20, the exit port 12 and the large bathway 15 are located around the high temperature radiant heat. A protective cover is installed to protect it as it exists.

Then, the pressure gauge 31 attached to the hydraulic line is installed in duplicate, and the pressure switches 22 and 22a are installed at the rear end of the cylinder, and when the maximum pressure is reached, the first, second and third pressure reducing valves 28 ( 28a) and 28b are set to 280bar for the primary, 300bar for the secondary, and 320bar for the tertiary, respectively, so that the driver can select the closing device 14 at the operation desk 30, and the generated pressures are transmitted to the controller 21. Finally, it was installed to control the flow rate, the check valve is installed on one side of the secondary pressure switch (22a).

The operation of the present invention configured as described above will be described.

As shown in Fig. 2 to Fig. 2, the melt produced in the furnace 11 is opened from the outlet 12 to the inside of the furnace 11 through a hole opening work for drilling the hole 12 through a hole. If it penetrates, the melt in the furnace 11 is discharged | emitted to the large tap water 15 through the tap opening 12. Opening works are performed using the opening BIT 50ψ or 55ψ bits.

Then, after a predetermined time has elapsed at the end of the melt in the furnace 11, the discharge of the melt is reduced and the gas and dust are ejected. This phenomenon is due to the opening of the tap opening 12, the diameter of the tap opening 12 is small at first, so that the amount of the melt discharged in the furnace is smaller than the amount of melt produced in the furnace, and as the time passes, the melt of the tap opening 12 is increased. As the diameter is enlarged, the discharge rate is increased more than the amount of melt produced in the furnace 11.

In addition, at the end of the tapping, the diameter of the tapping opening 12 is enlarged, and a large amount of melt is discharged, and the amount of molten iron is reduced after passing the maximum speed (10-12) ton / min. Begins.

When the air is started, the exit port is closed. First, the pressure reducing valve is set by the maximum pressure applied to the hydraulic line after the hydraulic pump 24 is operated at the operation desk.

In the setting method of the pressure reducing valves 28, 28a and 28b, when the hydraulic pressure reaches 280 bar when the primary pressure reducing valve 28 is set, the flow rate is drained and when the secondary pressure reducing valve 28.a is set. When the hydraulic pressure reaches 300 bar, the flow rate is drained, and when the third pressure reducing valve (28.b) is set, the flow rate is drained at 320 bar, and when one of them is selected, the flow rate is drained when the set pressure is reached.

Here, the pressure detection is finally received by the control unit 21 to receive the pressure of the pressure detection stage 20 installed in the body of the closure 14 and the pressure switch 22.a installed in the advance line of the closure 14 to drain when the maximum pressure is reached. In this way, even when the operator does not confirm the pressure, the control unit can stop the advance of the cylinder, thereby preventing the pressure rise and leakage in advance.

In particular, a check valve was installed to prevent the cylinder of the closure 14 from being pushed back due to the flow drain.

And, as shown in Figure 6, looking at the progress of the pressure generated in the pressure detection stage 20 attached to the closing device 14 is the electrical signal (4) by the signal generator 33 via the pressure transmitter 32 -20mA), the unit of pressure is divided into 0-300 bar to the pressure detection conversion unit 34, and the converted pressure is sent to the control unit 21, and the second pressure switch 22 (22a) on the pressure line side The pressure detected in the control unit 21 is also added to the two pressures in the control unit 21 to divide the hydraulic pressure when reaching the maximum pressure (280-320 bar) to minimize the work load and prevent leakage .

As described above, according to the tap-out pressure control device of the blast furnace according to the present invention, regardless of the expansion diameter of the tap-out port, the closure is joined to the turning tap-out port to advance the tapping cylinder, so that the mud material inside the tap-loader is pushed out. The pressure of the hydraulic pressure generated in the closing process is up to 320 bar. When the pressure reaches up to this point, a pressure increase occurs. The hydraulic load is blocked before the pressure increase occurs. You can prevent it.

When the hydraulic pump is operated at the desk, when the cylinder is moved forward, the pressure detection stage attached to the closure and the pressure switch installed on the hydraulic line are detected and transmitted to the control unit. Even if you do not put it, there is a practical effect to prevent the secondary accident of the installation and the work unit, that is, the pressure and leakage by blocking the hydraulic pressure in the control unit.

Claims (5)

A pressure detecting end (20) installed in the body of the closure so as to detect the pressure in the outlet (12) and the closure (14) of the blast furnace (1), A plurality of pressure reducing valves 28 connected to a hydraulic line driving a cylinder of the closure 14 and installed to drain at respective set pressures; A pressure switch 22 connected to the hydraulic line and installed to select a pressure reducing valve 28 when a predetermined pressure is reached; Outlet pressure control device of the blast furnace comprising a control unit 21 is connected to the pressure detecting unit 20 and the pressure switch 22 to compare the signals of both sides and is installed to shut off the hydraulic pressure at the maximum pressure According to claim 1, wherein the pressure detecting end 20, the outlet pressure regulating device of the blast furnace, characterized in that configured as an indicator connected to one side and a cylinder integrally installed on one side of the closing device (14) The pressure relief valve of the blast furnace according to claim 1, characterized in that the pressure reducing valve (28) comprises a third pressure reducing valve whose set pressure is set to 280 bar, 300 bar, and 320 bar, respectively. According to claim 1, wherein the pressure detected in the pressure detecting unit 20 is sequentially transmitted to the control unit 21 through the pressure transmitter 32, the electrical signal generating unit 33 and the pressure detection conversion unit 34 Outlet pressure regulator of the blast furnace, characterized in that the transmission The pressure switch device according to claim 1, wherein the pressure switch (22) is provided with a check valve to prevent the cylinder from being pushed when draining after reaching the maximum pressure.