KR101207623B1 - Sintering cooler fan control apparatus and sintering cooler fan control method using the same - Google Patents

Abstract

The present invention relates to a sintered cooler fan control system and a method for controlling a sintered cooler fan using the same. Specifically, the sintered cooler fan control system of the present invention is connected to a plurality of fan blades and one side of the fan blade, The drive device for rotating, the adjusting device for adjusting the inclination angle of the fan blade, the pressure sensor for measuring the pressure of the cooler main duct (cooler main duct) and the adjustment according to the internal pressure information of the cooler main duct collected by the pressure sensor And a control device for transmitting a control signal for adjusting the inclination angle of the fan blade to the device.

Description

Sintering cooler fan control apparatus and sinter cooler fan control method using same {Sintering cooler fan control apparatus and sintering cooler fan control method using the same}

The present invention relates to a sinter cooler fan control apparatus and a sinter cooler fan control method using the same, in particular, the sinter cooler fan control to maintain the pressure inside the sinter cooler to a certain range through the sinter cooler fan control of the sintering machine used in the production of sintered ore A device and a method for controlling a sinter cooler fan.

The sinter ore operation process consists of raw material mixing, charging, ignition, sintering, ventilation, cooling, screening and blast furnace charging.

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In the raw material mixing process, the coke and subsidiary material supplied from the coke plant is granulated in each hooper, and then quantitatively dispensed from the CFW (Constant Feeding Weigher) according to the set value calculated by the computer, and then in the mixer. After about 6% moisture addition, it is granulated in a surge hooper.

In the charging process, the mixed raw material granulated in the surge hopper is charged into the sintering machine.

In the ignition and sintering process, the blended raw material charged in the sintering machine is fired by forced suction in the main blower after surface ignition at about 1200 degrees in the ignition furnace, and then about 800 degrees sintered ore is charged in the sinter cooler.

In the ventilation and cooling process, to cool the sintered ore supplied to the sintered cooler, the sintered ore is cooled to about 110 degrees by using the cooler fan 1.2 by forcibly sucking the air and supplying it to the lower part of the cooler duct.

In the sorting and blast furnace charging process, the cooled sintered ore is sorted and then charged into the blast furnace.

The failure of the 1.2 sinter cooler fan, the bottleneck plant under the sinter plant of the blast furnace 4, results in unstable operation and reduced sinter ore production due to the sinter plant shutdown. In addition, the ratio of S / R (Sinter Ratio), which is an indicator of the quality and cost competitiveness of the blast furnace process, which is a post process, is lowered, which causes a decrease in the productivity of the molten iron due to the blast furnace unstable.

In particular, in the conventional cooler fan installation, poor breathability such as poor weather or poor operating conditions may occur. When a poor breathability occurs, the pressure in the cooler main duct instantly rises, causing a stall phenomenon (swirl) to damage the cooler fan blade.

Cooler fan blade breakage occurs more than four times a year due to the stall phenomenon. In addition, breakage of the impeller coupling occurs due to the vibration. If such problems occur, 40% reduction operation or plant shutdown is inevitable, resulting in a decrease of 11,880 tons per year.

In addition, the damaged fan blades may cause damage to the entire fan blade. Accordingly, the entire fan blade replacement requires excessive maintenance costs (300 million won in materials and 14 million won in repair costs) and maintenance time (39.6 hours / 4 times).

Therefore, the equipment failure of the 1.2 sintered cooler fan 1.2 has emerged as a problem that must be solved first in order to build the maximum production system of sintered ore.

The sintered cooler fan control apparatus of the present invention and the sintered cooler fan control method using the same to solve the above problems by controlling the cooler operation according to the pressure rise of the cooler duct, the sintered cooler control device and control method to prevent damage to the fan blades The purpose is to provide.

The sintered cooler fan control system according to an embodiment of the present invention for solving the above problems is a plurality of fan blades, a drive device connected to one side of the fan blade and rotating the fan blade and the inclination angle of the fan blades A sinter cooler fan that supplies air to the cooler main duct, a pressure sensor that measures the pressure of the cooler main duct, and internal pressure information of the cooler main duct collected by the pressure sensor. And a control device for transmitting a control signal for adjusting the inclination angle of the fan blade to the adjustment device.

And a position sensor for measuring an inclination angle of the fan blade, and the control device receives the inclination angle information of the fan blade from the position sensor and transmits a control signal for adjusting the inclination angle of the fan blade to the adjustment device. send.

The drive device includes a fan shaft that is connected to one side of the fan blade and becomes an axis of rotation, and a motor that rotates the fan shaft.

The adjusting device adjusts the inclination angle of the fan blade by using a hydraulic pump.

The control unit transmits a control signal for changing the inclination angle of the fan blade to reduce the opening degree of the sintered cooler fan when the internal pressure of the cooler main duct lasts longer than a first predetermined pressure. Reduce the internal pressure.

The control unit transmits a control signal for changing the inclination angle of the fan blade to increase the opening degree of the sintered cooler fan when the internal pressure of the cooler main duct is reduced to less than the second set pressure.

The control unit generates the control signal by comparing the pressure information measured by the pressure sensor with the first set pressure or the second set pressure using a PID (Proportional Integral Differential) control module.

When the sinter cooler is used in the 1.2 sintering process, the first set pressure is 42 mbar, the second set pressure is 36 mbar, and the preset time is 1 minute.

Inlet thermometer for measuring the temperature of the atmosphere to be sucked into the sinter cooler fan, a first pressure gauge for measuring the atmospheric pressure of the sinter cooler fan room, a second pressure gauge for measuring the air pressure of the sinter cooler fan inlet side and the sintering And a cooler fan stall pressure detection device having a third pressure gauge for measuring the air pressure at the cooler fan outlet side.

The sintered cooler fan control method according to an embodiment of the present invention for solving the above problems has a control device for adjusting the inclination angle of the fan blade and the inside of the sintered cooler fan and the cooler main duct to supply air to the cooler main duct In the sinter cooler fan control method using a sinter cooler fan control system including a pressure sensor for measuring the pressure, a sinter cooler driving process of rotating the sinter cooler fan to cool the sintered ore, by using the pressure sensor of the cooler main duct Pressure measurement process for measuring the internal pressure, if the internal pressure of the cooler main duct lasts for a predetermined time or more than the first set pressure, the opening angle of the sintered cooler fan by adjusting the inclination angle of the fan blade by using the adjusting device To reduce the pressure and the internal pressure of the cooler main duct to the second set pressure When the pressure is less than the force includes the step of increasing the opening degree of the sinter cooler fan by adjusting the inclination angle of the fan blade using the adjusting device.

The inclination angle information of the fan blade is received using a position sensor that measures the inclination angle of the fan blade, and transmits a control signal for changing the inclination angle of the fan blade to the adjusting device.

The first set pressure is 42 mbar, the second set pressure is 36 mbar, and the preset time is 1 minute.

According to the sinter cooler fan control apparatus and the sinter cooler fan control method using the same according to the present invention, it is possible to prevent the breakage of the cooler fan fan blade to increase the production of sintered ore and stabilize the quality.

In addition, according to the sintering cooler fan control apparatus of the present invention and the sintering cooler fan control method using the same according to the above solution, it is possible to prevent the wind blowing due to delayed granulation of sintered ore sintered, and to reduce the emission of pollutants by preventing the cooler fan stop It is possible to prevent the cooler fan stop, it is possible to stabilize the cooling capacity.

In addition, according to the sintering cooler fan control apparatus and the sintering cooler fan control method using the same according to the present invention, it is possible to prevent the generation of red light can prevent the premature degradation of the transport belt.

FIG. 2 is a graph showing the pressure in the cooler duct and the cooler fan vibration when the stall is generated in the 1.2 sinter cooler.
3 is a configuration diagram showing an example of the configuration of the sintered cooler fan control system of the present invention.
4 is a flow chart showing the flow of the sinter cooler fan control method of the present invention.
FIG. 5A is a schematic diagram illustrating a structure of a cooler fan to which a sinter cooler fan control system of the present invention is applied to a 1.2 sinter cooler. FIG.
5B is a layout view showing the arrangement of the pressure sensors in the sinter cooler fan control system of the present invention.
5C is a diagram illustrating a configuration of a cooler fan stall pressure detection device applied to the sintered cooler fan control system of the present invention.
7 is a graph showing the internal pressure of the cooler main duct and the inclination angle of the fan blade in the 1.2 sintering process to which the sinter cooler fan control system of the present invention is applied.
8 is a graph illustrating vibration magnitudes of the motor and the fan of each cooler fan in the 1.2 sintering process to which the sinter cooler fan control system of the present invention is applied.
9 is a graph illustrating the internal pressure of the cooler main duct and the inclination angle of the fan blades for 2 days in the 1.2 sintering process to which the sintering cooler fan control system of the present invention is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification.

In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

Prior to the description of the present invention, a brief description will be given of a situation in which a fan blade constituting a fan is broken in a conventional sinter cooler.

FIG. 2 is a graph showing the pressure in the cooler duct and the cooler fan vibration when the stall is generated in the 1.2 sinter cooler.

Referring to FIG. 2 (a), the pressure in the cooler duct repeatedly rises to 45 mbar or more when a stall occurs.

Referring to Figure 2 (b), the vibration of the cooler fan and motor also rises when the pressure in the cooler duct rises above 45 mbar.

If the vibration of the cooler rises, the fan blade is damaged by repeated damage to the cooler fan blade, the fan shaft and the coupling for fixing the blade, and the like.

The stall phenomenon means that when the two fans move, the amount of air in one fan decreases due to the pressure imbalance of the input air, and a kind of surging or vortex occurs as the pressure increases.

Therefore, when the stall occurs, since the pressure in the cooler duct rises, the stall may be prevented by adjusting the inclination angle of the fan blade of the cooler with respect to the fan shaft so as to sense the pressure and prevent the pressure rise.

3 is a configuration diagram showing an example of the configuration of the sintered cooler fan control system of the present invention.

Referring to FIG. 3, the sintered cooler fan control system of the present invention may include a fan blade 100, a driving device 200, a pressure sensor 300, a regulating device 400, and a control device 500. It may be configured to further include a position sensor 600.

The fan blade 100 serves as a fan blade for generating a flow of air to allow the outside air to enter the sinter through the cooler. A plurality of fan blades 100 may be attached to the driving device 200.

The driving device 200 rotates the fan blade 100. The driving device 200 may include a fan shaft 210 to which the fan blade 100 is attached and a rotation shaft, and a motor 220 to rotate the fan shaft 210.

The pressure sensor 300 measures the internal pressure of the cooler main duct. The pressure sensor 300 transmits the measured internal pressure information of the cooler main duct to the control device 500.

The adjusting device 400 adjusts the inclination angle of the fan blade 100. The inclination angle between the rotation shaft of the fan shaft 210 and the surface of the fan blade 100 may be adjusted to open or close the fan blade 100. If necessary, the adjusting device 400 may adjust the inclination angle of the fan blade 100 by using a hydraulic pump.

The position sensor 600 measures the inclination angle of the fan blade 100 and transmits the measured inclination angle information to the control device 500. The fan blade 100 is a device for configuring the sinter cooler fan control system as a feedback system to increase the accuracy of the control of the inclination angle.

The control device 500 transmits a control signal for adjusting the inclination angle of the fan blade 100 to the adjusting device 400 according to the internal pressure information of the cooler main duct collected by the pressure sensor 300. The adjusting device 400 adjusts the inclination angle of the fan blade 100 according to the control signal transmitted from the control device 500.

In addition, the control device 500 transmits an additional control signal to the adjustment device 400 when the inclination angle of the fan blade 100 does not reach the intended inclination angle with reference to the inclination angle information collected by the measuring device. Adjust the inclination angle of the fan blade 100.

The control device 500 may be implemented using a programmable logic controller (PLC) system, and may further include a human machine interface (HMI) system.

In addition, the control device 500 may notify the user when the internal pressure of the cooler main duct collected by the pressure sensor 300 exceeds the allowable value.

The sintering cooler fan control method of the control apparatus 500 is mentioned below.

4 is a flow chart showing the flow of the sinter cooler fan control method of the present invention.

The sintered cooler fan control method of the present invention uses a sintered cooler fan control system including a control device 400 for adjusting the inclination angle of the fan blade 100 and a pressure sensor 300 for measuring the internal pressure of the cooler main duct. Is performed.

Referring to FIG. 4, the sintered cooler fan control method of the present invention may be performed including a sintered cooler driving process (S10), a pressure measuring process (S20), a reduced pressure process (S30), and a boosting process (S40).

In the sintering cooler driving process (S10), the fan of the sintering cooler is rotated to supply external air to the sintering machine to cool the sintered ore.

In the pressure measuring process S20, the internal pressure of the cooler main duct is measured using the pressure sensor 300 during the sintering cooler driving process. This can determine whether the pressure in the cooler main duct needs to be adjusted.

In the depressurization process (S30), when the internal pressure of the cooler main duct lasts for a predetermined time equal to or greater than the first set pressure, it is determined that there is a risk of stall, and the inclination angle of the fan blade 100 to lower the pressure in the cooler main duct. Adjust Preferably, the inclination angle of the fan blade 100 is adjusted to close the sinter cooler fan to reduce the air flowing into the cooler main duct to reduce the pressure.

In the boosting process S40, when the internal pressure of the cooler main duct becomes less than the second set pressure, the internal pressure of the cooler main duct increases by adjusting the fan blade 100 for the normal operation of the cooler. Preferably, the inclination angle of the fan blades 100 is adjusted to open the sinter cooler fan to increase the air flowing into the cooler main duct to increase the pressure. If the internal pressure of the cooler main duct is kept low, the normal operation of the sinter ore operation is difficult.

Referring to FIG. 2, in the 1.2 sintered cooler, when the internal pressure of the cooler main duct exceeds 45 mbar, vibration occurs and breakage of the fan blade 100 occurs. In the 1.2 sintered cooler, the first set pressure is set to 42 mbar with a margin. Can be. If the first set pressure is set too low, the quality of the sintered ore may be deteriorated due to frequent closing of the cooler, and may impose a strain on the fan shaft 210 and the adjusting device 400. The first set pressure may be changed depending on the cooler used in the sintering process.

Referring to FIG. 2, there may be a peak in which the internal pressure of the cooler main duct reaches 45 mbar when a stall occurs, but it may be confirmed that the pressure state higher than the internal pressure of the average cooler main duct is maintained for a certain time. Therefore, when the internal pressure of the cooler main duct is maintained at a high pressure state for a predetermined time or more, it is determined that there is a risk of stall, and the inclination angle of the fan blade 100 should be adjusted. In the 1.2 sintering cooler, it may be determined that the fan blade 100 needs to be adjusted if it is maintained for 1 minute above the first set pressure.

In addition, referring to Figure 2, it can be confirmed that the internal pressure of the cooler main duct is rarely formed below 36 mbar. Accordingly, in the 1.2 sintered cooler, the fan blade 100 may be adjusted when the sintered cooler is 36 mbar or less so that the cooler is in the normal operation mode. In other words, the second set pressure may be set to 36 mbar. The second set pressure may also be changed depending on the cooler.

By using the sintered cooler fan control apparatus 500 and the sintered cooler fan control method using the same, the pressure in the cooler main duct can be adjusted within a predetermined range. Therefore, it is possible to prevent the fan blade 100 from being damaged by a momentary increase in the pressure in the cooler main duct due to rain or abnormal operation factors.

Hereinafter, an embodiment in which the sinter cooler fan control system of the present invention is applied to a 1.2 sinter cooler will be described.

FIG. 5A is a schematic diagram illustrating a structure of a cooler fan to which a sinter cooler fan control system of the present invention is applied to a 1.2 sinter cooler. FIG.

Referring to FIG. 5A, the sintered cooler fan control system of the present invention may open or close the cooler fan by using an adjusting device 400 including an oil pump 410 and an opening adjustment device 420. Internal pressure can be adjusted.

5B is a layout view showing the arrangement of the pressure sensor 300 of the sinter cooler fan control system of the present invention.

Referring to Figure 5b, the pressure sensor 300 of the present invention is disposed on the inner circumferential surface or the outer circumferential surface of the cooler main duct to measure the internal pressure of the cooler main duct.

5C is a diagram illustrating a configuration of a cooler fan stall pressure detection device applied to the sintered cooler fan control system of the present invention.

Referring to Figure 5c, the cooler fan stall pressure detection apparatus of the present invention is a thermometer for measuring the temperature of the outside air sucked into the cooler fan, a first pressure gauge for measuring the atmospheric pressure in the cooler fan, the first pressure gauge for measuring the inlet side pressure of the cooler fan It may comprise a second pressure gauge and a third pressure gauge for measuring the pressure on the cooler fan outlet side. In addition, although not shown, it may further include a round tube for detecting pressure.

 The cooler fan stall pressure detection device measures the air volume of the sintered fan cooler and transmits it to the control device.

The control unit uses the air volume information of the sintering fan cooler to determine whether or not the stall is generated, and when the stall is generated, it transmits a control signal that changes the inclination angle of the fan blade to reduce the opening degree of the sintering cooler fan to reduce the internal pressure of the cooler main duct. Reduce the pressure.

In order to control the internal pressure of the cooler main duct by changing the inclination angle of the fan blade 100, the control device 500 of the present invention controls a pressure maximum value setting block, a pressure setting value changing block, a timer block, and a cooler fan blade. It may be configured to include a value block, a pressure control PID block, and a fan blade control block.

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Hereinafter, the effect of applying the sintering cooler fan control system of the present invention to the 1.2 sintering process will be described in a graph.

7 is a graph showing the internal pressure of the cooler main duct and the inclination angle of the fan blade 100 in the 1.2 sintering process to which the sinter cooler fan control system of the present invention is applied.

Referring to FIGS. 7A and 7B, when the internal pressure of the cooler main duct rises to 42 mbar, it may be seen that the internal pressure of the cooler main duct is reduced by adjusting the inclination angle of the fan blade 100.

7 (a) and 7 (b), when the internal pressure of the cooler main duct drops to 36 mbar, it can be seen that the internal pressure of the cooler main duct is increased by adjusting the inclination angle of the fan blade 100. .

In addition, referring to FIG. 7 (b), it can be seen that the cooler is closed when the internal pressure of the cooler main duct is reduced, and the cooler is opened when the internal pressure of the cooler main duct is increased.

8 is a graph illustrating vibration magnitudes of the motor 220 and the fan of each cooler fan in the 1.2 sintering process to which the sinter cooler fan control system of the present invention is applied.

8 (a) and 8 (b), by managing the internal pressure of the cooler main duct to 42 mbar or less, it can be seen that the vibration of the motor 220 and the fan does not rise above a certain magnitude.

FIG. 9 is a graph illustrating the internal pressure of the cooler main duct and the inclination angle of the fan blade 100 during the 1.2 sintering process to which the sintering cooler fan control system of the present invention is applied for 2 days.

Referring to FIG. 9, when the internal pressure of the cooler main duct exceeds 42 mbar even when the sintering cooler fan is operated for a long time, it is confirmed that the inclination angle of the fan blade 100 is adjusted to reduce the internal pressure of the cooler main duct in response thereto. Can be.

Accordingly, the sinter cooler fan control system and the sinter cooler fan control method using the same maintain the internal pressure of the cooler main duct in a stable range despite the long time operation of the sinter cooler fan. As the internal pressure of the cooler main duct is maintained in a stable range, stall phenomenon may be prevented in the sintered cooler, thereby preventing damage to the fan blade 100.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

Claims (13)

A sintered cooler fan having a plurality of fan blades, a driving device connected to one side of the fan blades and rotating the fan blades, and an adjusting device for adjusting the inclination angle of the fan blades, for supplying air to a cooler main duct;
A pressure sensor measuring a pressure of the cooler main duct; And
It includes a control device for transmitting a control signal for adjusting the inclination angle of the fan blade to the control device according to the internal pressure information of the cooler main duct collected by the pressure sensor,
The control device
When the internal pressure of the cooler main duct lasts for more than a first predetermined time or more, the internal pressure of the cooler main duct is transmitted by transmitting a control signal for changing the inclination angle of the fan blade to reduce the opening degree of the sintered cooler fan. And depressurize the internal pressure of the cooler main duct to be lower than the second set pressure to transmit a control signal for changing the inclination angle of the fan blade to increase the opening degree of the sintered cooler fan. A sintered cooler fan control device characterized by boosting the pressure.
The method of claim 1,
Further comprising a position sensor for measuring the inclination angle of the fan blade,
The control device receives the inclination angle information of the fan blade from the position sensor and transmits a control signal for adjusting the inclination angle of the fan blade to the adjusting device.
The method of claim 1, wherein the driving device
A fan shaft connected to one side of the fan blade and configured to be an axis of rotation; And
Sinter cooler fan control device comprising a motor for rotating the fan shaft.
The sintering cooler fan control device according to claim 1, wherein the regulating device adjusts the inclination angle of the fan blade by using a hydraulic pump.
delete delete The method of claim 1, wherein the control device
And a control signal generated by comparing the pressure information measured by the pressure sensor with the first set pressure or the second set pressure using a PID (Proportional Integral Differential) control module.
The method of claim 1,
When the sintering cooler is used in the 1.2 sintering process, the first set pressure is 42mbar, the second set pressure is 36mbar, the predetermined time is 1 minute.
The method of claim 1,
An inlet thermometer for measuring the temperature of the atmosphere to be sucked into the sinter cooler fan;
A first manometer for measuring atmospheric pressure of the sinter cooler fan room;
A second manometer for measuring the air pressure at the inlet side of the sinter cooler fan; And
A cooler fan stall pressure detection device having a third pressure gauge for measuring the air pressure at the sinter cooler fan outlet side,
The cooler fan stall pressure detection device measures the air volume of the sintered cooler fan and transmits it to the control device,
The control device determines whether or not a stall is generated using the air volume information of the sintered fan cooler and transmits a control signal for changing the inclination angle of the fan blade to reduce the degree of opening of the sintered cooler fan when the stall occurs. Sintering cooler fan control device, characterized in that to reduce the internal pressure of the.
Sinter cooler fan control using a sinter cooler fan control system including a sinter cooler fan for adjusting the inclination angle of the fan blade and supplying air to the cooler main duct and a pressure sensor for measuring the internal pressure of the cooler main duct. In the method,
A sinter cooler driving process of rotating the sinter cooler fan to cool the sintered ore;
A pressure measuring process of measuring an internal pressure of a cooler main duct using the pressure sensor;
A decompression process of reducing the opening degree of the sintered cooler fan by adjusting the inclination angle of the fan blade by using the adjusting device when the internal pressure of the cooler main duct is maintained for a predetermined time above a first set pressure; And
When the internal pressure of the cooler main duct is less than the second set pressure includes the step of increasing the opening degree of the sintered cooler fan by adjusting the inclination angle of the fan blade by using the adjusting device,
The pressure measuring process measures the air volume of the sintered cooler fan to determine whether or not a stall is generated, and the decompression process is inclined of the fan blade by using the adjusting device even when it is determined that the stall is generated in the pressure measuring process. Sintering cooler fan control method characterized in that to reduce the opening degree of the sinter cooler fan by adjusting the angle.
The method of claim 10, wherein the inclination angle information of the fan blade is received by using a position sensor for measuring the inclination angle of the fan blade and transmits a control signal for changing the inclination angle of the fan blade to the adjusting device. Sinter cooler fan control method.
The method of claim 10, wherein the first set pressure is 42 mbar, the second set pressure is 36 mbar, and the preset time is 1 minute.
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