KR20200055397A - System for reducing dust and method thereof - Google Patents

Abstract

According to an embodiment, a system for reducing exhaust dust and a method thereof are disclosed. The system for reducing exhaust dust comprises: an electric dust collector which collects dust contained in gas generated from a converter; a charging device which supplies dust collecting current to the inside of the electric dust collector; a thermometer for measuring a temperature value of the electric dust collector; a blower for introducing the gas into the electric dust collector; a steam spray device installed on a lower portion of an outlet through which the gas passing through the blower is discharged, and spraying steam; and a control device for determining at least one of the amount of dust collecting current supplied to the charging device, the target operation speed of the blower, or the spraying of the steam through the steam spray device, based on a current value of the charging device and the temperature value of the thermometer.

Description

System and method for reducing exhaust dust {SYSTEM FOR REDUCING DUST AND METHOD THEREOF}

An embodiment relates to a technology for reducing exhaust dust, and more particularly, to a system and method for reducing exhaust dust by operating in a predetermined reduction mode based on whether a current value of an electrostatic precipitator is lowered and a temperature value is increased. It is about.

In general, the process of preparing and refining the converter is scrap metal charging-> charter charging-> primary oxygen blowing operation (refining job, blow job)-> slag removal operation-> secondary oxygen blowing job (refining job, main blow job) Work)-> Lifting work-> Odor work (can be omitted if necessary)-> Nitrogen coating process is repeated. Exhaust gas containing dust generated at this time is coarse with a boiler at the upper part of the converter by the suction power of the forced inducing blower. The primary dust collector installed to collect dust and the electric dust collector installed to collect fine dust are converted into clean gas, and if a certain condition is met, the facility is configured to discharge or recover the smoke from the three sides to the chimney and recycle it as energy. have.

During this process, the electrostatic precipitator that collects and processes the dust contained in the exhaust gas supplies electricity from the outside to the inside. In the case of refining work (stripping work) where a lot of dust is generated, high dust collection from the charging devices 1, 2, 3 The program is configured to maintain the current and maintain a low collection current other than the refining and preparation work, and to maintain a low collection current to protect equipment even when an internal abnormal reaction of the electrostatic precipitator occurs during the refining operation.

Also, inside the electrostatic precipitator, a dust collecting plate and a discharge electrode are installed to collect dust collected in the flowing exhaust gas, and the dust collecting device is operated to drop the collected dust to the bottom to treat it. As a method, a gas stabilization layer is formed inside the electrostatic precipitator before the converter refining operation starts. That is, by increasing the speed of the forced inducing blower, as much as possible, the outside air flows into the interior of the electrostatic precipitator so that the gas layer flows in the order of O ₂ gas-> CO ₂ gas-> CO gas during the refining operation, and the CO₂ gas layer is 20 m from the duct. As described above, a gas stabilization layer is formed in the electrostatic precipitator to prevent an adverse reaction when a distance of 1 m or more is maintained.

However, inside the electrostatic precipitator, there is always a risk of adverse reactions due to charging conditions, spark scattering, etc. due to the inflow of gas, and there is always a delay in ignition of oxygen that is injected at the start of the refining operation, defective dust from the internal dust collecting plate of the electrostatic precipitator, and converter The gas stabilization layer is destroyed due to all factors such as the residual amount of slag, the contents of scrap metal, and subsidiary ingredients, and there is a problem of abnormal reaction at 12% or more of CO gas and 6% or more of O₂ gas. When the flue gas flow rate is increased due to the converter refining preparation when it is being controlled, the dust collecting current is maintained at a lower value than the low dust collecting current, and a visible dust is discharged through the chimney.

The countermeasure is to stop the scouring operation of the converter on the screen of the facility operation when the driver visually observes the emission of visible dust on the screen of the chimney monitoring monitor, which monitors the chimney, speeds up the blowing of steam into the chimney, injects high dust collection current, or forces a manned fan. The manual adjustment by the driver is only a follow-up action after many visible dust has already been discharged through the chimney, and the visibility of the dust has been discharged into the chimney under a situation where one worker drives and monitors three electric furnaces. The case of not knowing itself is caused by multiple reflections.

Patent Publication No. 10-2018-0074190

An embodiment may provide a system and a method for reducing exhaust dust by operating in a predetermined reduction mode based on whether a current value of an electrostatic precipitator is lowered and whether a temperature value is increased.

A system for reducing exhaust dust according to an embodiment of the present invention includes an electric dust collector for collecting dust contained in gas generated in a converter; A charging device that supplies a collecting current to the interior of the electrostatic precipitator; A thermometer measuring the temperature value of the electrostatic precipitator; A blower for introducing the gas into the electrostatic precipitator; A steam injection device installed at a lower portion of an outlet through which the gas passing through the blower is discharged, and spraying steam; And a control for determining at least one of an amount of current collected to the charging device based on the current value of the charging device and the temperature value of the thermometer, a target operating speed of the blower, and whether or not steam is injected through the steam injection device. It may include a device.

The control device is based on whether the current value of the charging device is lowered and whether the temperature value of the electrostatic precipitator is increased, the amount of current collected to the charging device, the target operating speed of the blower, through the steam injection device At least one of steam injection may be determined.

In the control device, the current value is equal to or less than a threshold current value for a predetermined threshold time, and a difference value between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is less than a threshold temperature value. In this case, the steam injector is driven to inject steam, and a collection current of a predetermined size can be supplied to the charging device.

In the control device, the current value is equal to or less than a threshold current value for a predetermined threshold time, and a difference value between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is equal to or greater than the threshold temperature value. In this case, the blower may be driven downward at a predetermined target operating speed, and the steam injection device may be driven to spray the steam.

The threshold current value may be set to 100mA, the threshold temperature value may be set to 10 ° C, and the threshold time may be set to 3 seconds.

The charging device is installed at a predetermined interval on one side of the electrostatic precipitator, a first charging device installed at the front end of the electrostatic precipitator, a second charging device installed in the middle of the electrostatic precipitator, and a third charge installed at the rear end of the electrostatic precipitator An apparatus, wherein the control device is based on the current value of the third charging device and the temperature value of the thermometer, the amount of current collected to the charging device, the target operating speed of the blower, and through the steam injection device At least one of steam injection may be determined.

A method for reducing exhaust dust according to another embodiment of the present invention comprises the steps of receiving a current value of a charging device that supplies a dust collecting current to an inside of an electrostatic precipitator that collects dust contained in gas generated in a converter; Receiving a temperature value of the electrostatic precipitator; And determining whether or not the electrostatic precipitator reacts internally based on the received current value of the charging device and the temperature value. The method may include determining at least one of a target operating speed of the inflowing blower and steam injection through a steam injection device installed at a lower portion of the outlet for discharging the gas.

In the controlling step, it is possible to determine whether an internal abnormal reaction of the electrostatic precipitator has occurred based on whether the electric current value of the electrostatic precipitator has decreased or not.

In the controlling step, the current value is equal to or less than a threshold current value for a predetermined threshold time, and a difference between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is a threshold temperature value. In the case of less than, it is determined that the current collecting current of the electrostatic precipitator is reduced, and the steam injector is driven according to the determined result to inject steam and supply the current of the predetermined size to the charging device.

In the controlling step, the current value is equal to or less than a threshold current value for a predetermined threshold time, and a difference between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is a threshold temperature value. In the case of abnormality, it may be determined as an internal abnormal reaction state of the electrostatic precipitator, and the blower may be driven downwardly at a predetermined minimum speed according to the determined result, and steam may be injected by driving the steam injector.

According to the embodiment, it is determined whether the internal reaction of the electrostatic precipitator is abnormal based on whether the current value of the electrical charge precipitator that supplies current to the interior of the electrostatic precipitator is lowered and whether the temperature value of the electrostatic precipitator is increased, and is charged according to the determined result. By supplying the collecting current to the device, adjusting the operating speed of the blower installed at the rear end of the electrostatic precipitator, and performing at least one of steam injection through the steam injection device installed in the lower duct of the outlet, through the chimney during refining preparation and refining operations Dust emissions can be drastically reduced.

According to the embodiment, since dust emission can be reduced, air pollution can be prevented to prevent local residents' complaints and prevent the company from losing image.

1 is a view showing a system for reducing exhaust dust according to an embodiment of the present invention.
FIG. 2 is a view showing a detailed configuration of the control device shown in FIG. 1.
3 is a view showing a case in which the current collecting current falls without an internal reaction of the electrostatic precipitator.
4 is a view showing a case where an internal reaction of the electrostatic precipitator occurs.
5 is a view showing a method for reducing exhaust dust according to an embodiment of the present invention.

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

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the technical spirit scope of the present invention, one or more of its components between embodiments may be selectively selected. It can be used by bonding and substitution.

In addition, the terms used in the embodiments of the present invention (including technical and scientific terms), unless specifically defined and described, can be generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and commonly used terms, such as predefined terms, may interpret the meaning in consideration of the contextual meaning of the related technology.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, a singular form may also include a plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and B, C”, a combination of A, B, and C It can contain one or more of all possible combinations.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only for distinguishing the component from other components, and the term is not limited to the nature, order, or order of the component.

And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also to the component It may also include the case of 'connected', 'coupled' or 'connected' due to another component between the other components.

In addition, when described as being formed or disposed in the “upper (upper) or lower (lower)” of each component, the upper (upper) or lower (lower) is not only when the two components are in direct contact with each other, but also one It also includes a case in which another component described above is formed or disposed between two components. In addition, when expressed as “up (up) or down (down)”, it may include the meaning of the downward direction as well as the upward direction based on one component.

In an embodiment, it is determined whether the internal reaction of the electrostatic precipitator reacts based on whether the current value of the electrostatic precipitator decreases and the temperature value of the electrostatic precipitator rises, and the charging device according to the determined result. A new method is proposed to perform at least one of supplying the dust collecting current to the furnace, adjusting the operating speed of the blower installed at the rear end of the electrostatic precipitator, and steam injection through a steam injector installed in the lower duct of the outlet.

That is, the gas stabilization layer is not formed inside the electrostatic precipitator due to the influence of ignition delay, residual slag amount inside the converter, scrap metal contents, and auxiliary raw material components when the electrostatic precipitator current falls during a converter refining preparation for a relatively long time or during the scouring operation of the converter. When an adverse reaction occurs due to failure, a situation occurs in which scattered dust is discharged through the discharge port. At this time, it is intended to reduce the dust (or visible dust or scattered dust) emitted by recognizing an abnormal sign in advance.

1 is a view showing a system for reducing exhaust dust according to an embodiment of the present invention.

Referring to FIG. 1, a system for reducing exhaust dust according to an embodiment of the present invention includes a converter 1, a boiler 2, a primary dust collector 3, an electric dust collector 4, and a charging device 5 , Thermometer (6), blower (7), three sides (8), may include a steam injection device (9), the outlet (10) and the control device (20).

Furnace (1) Preparation work for refining, smelting work, furnace coating work, vacancy work, work to put scrap metal and molten iron into the converter (1), or after placing scrap metal and molten iron, put the furnace head of the converter (1) up Exhaust gas may be generated in the converter 1 when the oxygen is blown using the upper oxygen injecting device 11 to perform refining of the converter 1.

Exhaust gas containing dust generated from the converter (1) is clean through the boiler (2) and the primary dust collector (3) that primarily collects coarse dust, and the electrical dust collector (4) that secondaryly collects fine dust. When converted to gas and meets certain conditions, it is configured to be discharged through the three-sided side 8, that is, discharged to the chimney or recovered to be recycled as energy.

On the upper part of the converter (1) containing scrap metal and streamline, a boiler (2) is installed to produce steam by recovering cooling and high heat when high-temperature exhaust gas containing high-concentration dust generated during refining is passed, and boiler ( At the rear end of 2), a primary dust collector 3 capable of collecting relatively large dust particles may be installed.

The exhaust gas that has passed through the primary dust collector 3 may be introduced into the electrical dust collector 4 and collected into fine dust to be converted into clean gas. At the rear end of the electrostatic precipitator 4, a blower 12 is installed to allow exhaust gas generated from the converter 1 to be introduced into the electrostatic precipitator 4, and the gas is introduced to discharge clean gas to a subsequent process. It is. The exhaust passage through which the gas that has passed through the blower 12 is burned and released to the atmosphere according to the gas concentration, that is, the chimney 10, and the three sides 11 that can determine the flow path to the gas storage device for recovery and recycling Can be. Here, as the blower 12, for example, a forced-induced blower (IDF, Induced Draft Fan) may be used.

The electrostatic precipitator 4 is equipped with a plurality of charging devices 5 capable of charging high voltage and current at the upper portion to collect dust, and the high precipitating current or low precipitating current is collected into the electrostatic precipitator 4 according to the work process. In order to supply current or measure the current collected, a thermometer (6) capable of measuring gas temperature is installed at the rear end of the electrostatic precipitator (4), while collecting and receiving signals with the control device (20). The gas temperature can be measured and the measured temperature value can be sent to the control device 20. Here, the high collection current may be 500 mA or more, and the low collection current may be less than 500 mA.

A plurality of charging devices (5) is installed at a predetermined interval on one side of the electrostatic precipitator (4), for example, installed in the middle of the first charging device (5a), the electrostatic precipitator (4) installed at the front end of the electrostatic precipitator (4) The second charging device 5b may be divided into a third charging device 5c installed at the rear end of the electrostatic precipitator 4. In the embodiment, the three charging devices are described as an example, but the number of the charging devices may be changed as necessary.

Between the three sides 11 and the outlet 10 for discharging exhaust gas, a steam injector 9 capable of injecting steam is installed when necessary to inject steam by a signal from the control device 20.

The control device 20 includes the current value of the charging device 5c installed on one side of the electrostatic precipitator 4 and the thermometer 6 installed at the rear end of the electrostatic precipitator 4 during the preparation or refining operation of the converter 1 Compare the temperature value in real time for a predetermined threshold time to supply the collecting current of the charging devices 5a, 5b, 5c of the electrostatic precipitator 4, control the operating speed of the forced inducing blower 12, of the steam injector 9 Steam injection can be controlled automatically. All of these devices are automatically driven according to the program set in the control device 20 in advance, and when dust is discharged through the discharge port 10, the driver automatically reduces the dust before being discharged. By performing the reduction work, dust discharged to the discharge port can be drastically reduced.

At this time, in the case of the first charge device 5a and the second charge device 5b, the current value of the third charge device 5c is used in the present invention because the current value often decreases.

At this time, the control device 20 may reduce dust discharged to the outlet 10 by selectively operating a predetermined first reduction mode or a second reduction mode based on the current value and the temperature value.

In one example, the control device 20 has a current value equal to or less than a threshold current value for a predetermined threshold time, and a difference value between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is preset. If it is less than a predetermined threshold temperature value, it is determined that the current collection state of the electrostatic precipitator is not the internal abnormal reaction of the electrostatic precipitator, and as a result of the determination, the first reduction mode is selected and the steam injection device 9 is driven according to the selected first reduction mode. It can be controlled to inject the steam, and to supply the current collecting current of a predetermined size to the charging device (5a, 5b, 5c).

As another example, the control device 20 has a current value equal to or less than a threshold current value for a predetermined threshold time, and a difference between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is the threshold temperature. If the value is greater than or equal to the value, it is judged as an internal abnormal reaction state of the electrostatic precipitator, and as a result of the determination, the blower 7 is driven down to a predetermined target operating speed, for example, a minimum operating speed of 600 rpm, according to the selected second reduction mode. It can be controlled to spray the steam by driving the steam injection device (9).

At this time, the threshold current value may be set to 100mA, the threshold temperature value to 10 ° C, and the threshold time to 3 seconds. The threshold value is not necessarily limited thereto, and may be changed as necessary.

FIG. 2 is a view showing a detailed configuration of the control device shown in FIG. 1.

2, the control device 20 according to an embodiment of the present invention includes a communication unit 21, an input unit 22, a storage unit 23, the control unit 24, the first display unit 25, the second A display unit 26 may be included.

The communication unit 21 may transmit and receive various signals in conjunction with a charging device, a thermometer, a blower, and a steam injection device. For example, the communication unit 21 transmits a signal for supplying a high collection current or a low collection current to the interior of the electrostatic precipitator in conjunction with a charging device, or the magnitude of the collection current measured from the charging device, that is, the current value I can receive it.

The input unit 22 may receive operation information by a user's menu or key operation.

The storage unit 23 may store a program and related information to operate to automatically reduce exhaust gas in conjunction with a charging device, a thermometer, a blower, and a steam injection device.

The controller 24 may select and operate a predetermined first reduction mode or a second reduction mode based on the current value measured from the charging device and the temperature value measured from the thermometer.

The controller 24 has a current value equal to or less than a threshold current value for a predetermined threshold time, and a difference value between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is less than a predetermined threshold temperature value. In this case, the first reduction mode may be selected by judging by the drop in the current collected by the electrostatic precipitator rather than the internal abnormal reaction of the electrostatic precipitator.

3 is a view showing a case in which the current collecting current falls without an internal reaction of the electrostatic precipitator.

Referring to FIG. 3, a case in which the current collecting current of the electrostatic precipitator, which is not an internal abnormal reaction of the electrostatic precipitator, decreases, that is, a high precipitating current, that is, a first precipitating current (C1) and a low precipitating current, that is, a second precipitating current It can be seen that the abnormal current collection current C3 lower than (C2) is maintained in a predetermined section.

That is, when the exhaust gas flow rate is increased in a situation in which the electrostatic precipitator is controlled by the second precipitating current C2 that is lower than the first precipitating current C1, the abnormal precipitating current C3 is lower than the second precipitating current C2. Therefore, a phenomenon in which visible dust is discharged through the outlet may occur.

When the current value is equal to or less than the threshold current value for a predetermined threshold time, and the difference between the temperature value measured at the end of the threshold time and the temperature value measured at the start time of the threshold time is greater than or equal to the threshold temperature value. Judging by the internal reaction of the dust collector, the second reduction mode can be selected as a result of the determination.

4 is a view showing a case where an internal reaction of the electrostatic precipitator occurs.

Referring to FIG. 4, the collection currents C1, C2, and C3 supplied from each of the first charging device, the second charging device, and the third charging device installed in the electrostatic precipitator are shown. At the same time, it can be seen that the temperature T of the electrostatic precipitator is rapidly increasing.

That is, it can be seen that, when an internal abnormal reaction of the electrostatic precipitator occurs, the collection current falls sharply, in particular, the collection current C3 of the third charging device among the plurality of charging devices decreases rapidly and the temperature T increases rapidly.

When the first reduction mode is selected, the control unit 24 drives the steam injection device 9 to spray steam, and controls the charging devices 5a, 5b, and 5c to supply a collection current of a predetermined size. 2 When the reduction mode is selected, it is possible to control the blower 7 to be driven at a predetermined minimum speed and the steam injection device 9 to spray the steam.

The first display unit 25 may display contents related to the operation of the facility. Through the first display unit 250, the manager can check the refining operation of the converter 1, whether the charging current is supplied to the charging device, whether the steam injection device is spraying steam, and the operating speed of the blower.

The second display unit 26 may display a state in which visible dust is discharged through the outlet.

5 is a view showing a method for reducing exhaust dust according to an embodiment of the present invention.

Referring to FIG. 5, the control device according to an embodiment of the present invention periodically measures a current value measured from a charging device that supplies a current to the interior of the electrostatic precipitator and a temperature measured from a thermometer measuring the temperature value of the electrostatic precipitator The value may be received (S501).

Next, the control device may check whether the received current value is equal to or less than a predetermined threshold current value (S502).

Next, the control device may drive the timer when the received current value is less than or equal to the predetermined threshold current value (S503), and determine whether the holding time measured by the timer is greater than or equal to the predetermined threshold time (S504). That is, it can be confirmed whether the current value is maintained for a threshold time below the threshold current value. On the other hand, if the received current value is not below a predetermined threshold current value, the control device may perform the process of receiving the measured current value and temperature value again.

Next, the control device may check whether the difference between the temperature value measured at the end of the threshold time and the temperature value measured at the start time of the threshold time is greater than or equal to the threshold temperature when the measured holding time is greater than or equal to the threshold time ( S505).

Next, when the difference value is equal to or greater than the threshold temperature value, the control device may determine the internal abnormal reaction of the electrostatic precipitator and select the second reduction mode as a result of the determination (S508).

Next, the control device may drive the blower at a predetermined target operating speed for a predetermined time according to the selected second reduction mode, and may spray the steam by driving the steam injection device (S509).

On the other hand, if the difference value is not equal to or greater than the threshold temperature value, the control device may determine that the current collection of the electrostatic precipitator is not the internal abnormal reaction of the electrostatic precipitator, and may select the first reduction mode as a result of the determination (S506).

Next, the control device may spray the steam by driving the steam injection device for a predetermined time according to the selected first reduction mode, and supply a collection current of a predetermined size to all charging devices (S507). Here, the predetermined size may be 500mA.

Through this process, the discharge of dust through the outlet is checked, and if the current value measured by the charging device rises above a predetermined threshold current value, all processes will be terminated because it switches to the state before the internal reaction of the electrostatic precipitator. Can be.

The term '~ unit' used in this embodiment means a software or hardware component such as a field-programmable gate array (FPGA) or an ASIC, and the '~ unit' performs certain roles. However, '~ wealth' is not limited to software or hardware. The '~ unit' may be configured to be in an addressable storage medium or may be configured to reproduce one or more processors. Thus, as an example, '~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The functions provided within components and '~ units' may be combined into a smaller number of components and '~ units', or further separated into additional components and '~ units'. In addition, the components and '~ unit' may be implemented to play one or more CPUs in the device or secure multimedia card.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that you can.

1: converter
2: boiler
3: Primary dust collector
4: Electrostatic precipitator
5: Charging device
6: Thermometer
7: blower
8: three sides
9: Steam injector
10: outlet
11: Oxygen blowing device
20: control device

Claims (12)

An electrostatic precipitator that collects dust contained in gas generated in the converter;
A charging device that supplies current to the interior of the electrostatic precipitator;
A thermometer measuring the temperature value of the electrostatic precipitator;
A blower for introducing the gas into the electrostatic precipitator;
A steam injection device installed at a lower portion of an outlet through which the gas passing through the blower is discharged, and spraying steam; And
Based on the current value of the charging device and the temperature value of the thermometer, a control device for determining at least one of the amount of current collected to the charging device, the target operating speed of the blower, and whether or not steam is injected through the steam injection device A system for reducing exhaust dust comprising a. According to claim 1,
The control device,
Based on whether the current value of the charging device decreases and whether the temperature value of the electrostatic precipitator rises, the amount of current collecting to the charging device, the target operating speed of the blower, or whether the steam is injected through the steam injection device A system for reducing exhaust dust, which determines at least one. According to claim 2,
The control device,
If the current value is less than a threshold current value for a predetermined threshold time, and the difference between the temperature value measured at the end of the threshold time and the temperature value measured at the start time of the threshold time is less than the threshold temperature value, the steam A system for reducing exhaust dust by driving an injector to inject steam and supply a collection current of a predetermined size to the charging device. According to claim 2,
The control device,
If the current value is less than a threshold current value for a predetermined threshold time, and the difference between the temperature value measured at the end of the threshold time and the temperature value measured at the start time of the threshold time is greater than or equal to the threshold temperature value, the blower A system for reducing exhaust dust by driving downwards at a predetermined target operating speed and spraying steam by driving the steam jet. The method of claim 3 or 4,
The threshold current value is set to 100mA, the system for reducing exhaust dust. The method of claim 3 or 4,
The threshold temperature value is set to 10 ℃, the system for reducing exhaust dust. The method of claim 3 or 4,
The threshold time is set to 3 seconds, a system for reducing exhaust dust. According to claim 1,
The charging device,
It includes a first charging device installed at a predetermined interval on one side of the electrostatic precipitator, installed at a front end of the electrostatic precipitator, a second charging device installed in the middle of the electrostatic precipitator, and a third charging device installed at a rear end of the electrostatic precipitator ,
The control device is based on the current value of the third charging device and the temperature value of the thermometer, based on the amount of current collected to the charging device, the target operating speed of the blower, and whether or not steam is injected through the steam injection device. A system for reducing exhaust dust, which determines one. Receiving a current value of a charging device for supplying the collecting current to the interior of the electrostatic precipitator collecting dust contained in the gas generated in the converter;
Receiving a temperature value of the electrostatic precipitator; And
Based on the received current value of the charging device and the temperature value, it is determined whether or not the electrostatic precipitator reacts internally, and according to the determined result, the amount of the collecting current supplied to the charging device and the gas to the electrostatic precipitator And controlling to perform at least one of a target operating speed of the inflowing blower and whether or not steam is injected through a steam injector installed at a lower portion of the outlet for discharging the gas. The method of claim 9,
In the step of controlling,
A method for reducing exhaust dust, based on whether the current value of the charging device is lowered and whether the temperature of the electrostatic precipitator is increased, whether the internal precipitator reacts internally or not. The method of claim 10,
In the step of controlling,
The electrostatic precipitator when the current value is equal to or less than a threshold current value for a predetermined threshold time, and a difference between a temperature value measured at the end of the threshold time and a temperature value measured at the start time of the threshold time is less than a threshold temperature value. Judging by the current dropping current,
A method for reducing exhaust dust by driving the steam injector according to the determined result, injecting steam, and supplying a collection current of a predetermined size to the charging device. The method of claim 10,
In the step of controlling,
If the current value is less than a threshold current value for a predetermined threshold time, and the difference between the temperature value measured at the end of the threshold time and the temperature value measured at the start time of the threshold time is greater than the threshold temperature value, the electrostatic precipitator Judging from the internal reaction state,
A method for reducing exhaust dust by driving the blower downward at a predetermined minimum speed and spraying steam by driving the steam injector according to the determined result.

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