KR20180074190A - Appratus for reducing fugitive dust - Google Patents

Abstract

The objective of the present invention is to provide an apparatus for reducing discharge of dust, preventing large amounts of dust, generated in a certain process of a steel-making process, from being discharged to the outside of a steel mill. According to one embodiment of the present invention, the apparatus comprises: a ventilation unit disposed in a building; a dust measurer disposed in the building and measuring dust concentration in the building; a wind speed measurer disposed in the building and measuring a wind speed of an air current flowing in the building; and a mist sprayer disposed in the ventilation unit and spraying water particles.

Description

{APPRATUS FOR REDUCING FUGITIVE DUST}

The present invention relates to a discharge dust reduction apparatus, and more particularly, to a discharge dust reduction apparatus capable of preventing dust generated inside a plant from being diffused to the outside of a plant through a ventilation section during a steelmaking process.

The steelmaking process consists of pretreatment of the pig iron (desulfurization and slag removal), chartering (charging, oxygenation, etc.), secondary metallurgy and casting process. Particularly, large amounts of dust are generated in the pretreatment of pig iron and in the conversion operation.

Dust generated during the steelmaking process is removed through the hood and the dog house installed in the steelmaking facility.

On the other hand, a considerable amount of dust is diffused into the factory without being collected, even though the hood is installed at a near point of the occurrence point in the process. The diffused dust rises to the roof in the factory by air currents and is discharged outside the factory through a number of openings installed to discharge heat to the plant roof.

Here, in order to minimize the amount of such diffused dust being discharged to the outside of the factory, a hood and a discharge system called a dry cleaner or a dry cleaner are installed under the plant roof. However, a large amount of dust is generated in a short period of time in a certain process (for example, a converter charging and an oxygen smelting process) in the steelmaking process, so that a large amount of dust can not be collected by only the hood and the exhausting system, .

Therefore, there is a need for a method capable of reducing the amount of dust generated during the steelmaking process from being discharged outside the plant.

For reference, Japanese Patent Application Laid-Open No. 10-2016-0108042 discloses a dust collecting apparatus that prevents dust generated during a steelmaking process from diffusing to the outside of a work site. However, in the dust collecting apparatus disclosed in Japanese Patent Application Laid-Open No. 10-2016-0108042 Since the collecting device is installed around the blast furnace, it does not prevent the exhaust of the dust spreading throughout the steel mill.

KR 10-2016-0108042 A

The present invention has been made to solve at least some of the problems of the prior art as described above, and it is an object of the present invention to provide a method and apparatus for removing exhaust dust, which can prevent a large amount of dust generated in a specific process during a steelmaking process from being discharged to the outside of a steelmaking plant And it is an object of the present invention to provide a reduction device.

According to an aspect of the present invention, there is provided an air conditioner comprising: a ventilation unit installed in a building; A dust measuring unit provided inside the building for measuring a dust concentration inside the building; An air flow meter provided inside the building for measuring the wind speed of the air flowing inside the building; And a mist sprayer provided in the ventilation part and spraying water particles.

Also, the discharge dust reduction apparatus according to an embodiment of the present invention may include a controller for controlling the water particle injection amount of the mist sprayer on the basis of the dust concentration measured by the dust meter and the wind speed measured by the wind speed meter .

According to an embodiment of the present invention having such a configuration, dust generated in the steelmaking plant during the steelmaking process can be prevented from being discharged to the outside.

1 is a schematic view showing a configuration of a discharge dust reduction apparatus according to an embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Furthermore, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

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

Referring to FIG. 1, an exhaust dust reduction apparatus 100 according to an embodiment of the present invention will be described.

1, a discharge dust abatement apparatus 100 according to an embodiment of the present invention includes a ventilation unit 110, a dust meter 140, a wind speed meter 150, a mist sprayer 130, A controller 120, and a controller 160. [

The ventilation part 110 may be provided in a factory building 10 of a steelmaking plant to function as a heat exhausting passage for discharging heat generated inside the factory building 10 to the outside. The ventilation part 110 may be formed in the shape of an opening through which air can flow in and out of the roof of the factory building 10, but is not limited thereto.

Meanwhile, a converter 20 for performing a steelmaking process is disposed at the bottom of the factory building 10 of the steelmaking plant.

The dust meter 140 is provided inside the factory building 10 and can measure the dust concentration inside the process building generated in the converter 20 during the steelmaking process.

For example, the concentration of dust generated during pre-treatment of pig iron during the steelmaking process is firstly removed by the hood (not shown) and the dog house (not shown) near the converter 20, and the concentration of about 10 mg / Nm ³ or less When the concentration of dust generated at the time of oxygen blowing in the steelmaking process is reduced to 5 to 10 mg / Nm ³ through the primary ventilation, the dust-removing system, and the dust collector, 10 mg / Nm < ^{3 &} gt ;, but the present invention is not limited thereto, and the performance can be adjusted in consideration of the concentration of dust generated in the steelmaking process.

In addition, for example, the dust measuring instrument 140 may be configured to measure total dust particles in the factory building 10, fine dusts of 10 μm or less, and dust particles of 2.5 μm or less in order to measure all kinds of dusts of various sizes occurring in the factory building 10 And may be configured to have a capability of simultaneously measuring ultrafine dust, but the present invention is not limited thereto.

Generally, the dust generated in the converter 20 is collected by the dust collector installed near the converter 20, and the heavy dust in the dust falls to the bottom of the factory building 10, so that the inside of the factory building 10 The difference in dust concentration between the upper and lower layers may be significant. Therefore, even if the dust concentration in the lower portion of the factory building 10 is high, the concentration of the dust rising up to the ventilation portion 110 may be relatively low.

Therefore, it is preferable that the dust meter 140 is installed at a height of 30% or more from the floor at the internal height of the factory building 10.

In addition, when the dust measuring device 140 is installed close to the roof, the dust concentration measured by the dust measuring device 140 can be measured to be lower than the actual dust concentration by the dust collecting operation of the dry type dust collector 120 to be described later. The dust meter 140 is installed at a height of 70% or less from the floor at the internal height of the factory building 10 in order to accurately measure the density of the dust flowing on the ascending air flow inside the factory building 10 .

Consequently, in one embodiment, the dust meter 140 may be installed at a height of 30% to 70% of the height from the bottom of the factory building 10 to the roof.

The wind speed meter 150 is provided inside the factory building 10 and can measure the wind speed of the airflow flowing into the factory building 10.

In one embodiment, the wind speed meter 150 may be configured to measure the wind speed of the upward flow toward the ventilation part 110 provided on the roof of the factory building 10.

Also, in one embodiment, the wind speed meter 150, like the dust meter 140, may be installed at a height of 30% to 70% of the height from the floor to the roof of the factory building 10.

When the wind speed meter 150 is installed at a height of less than 30% of the height of the inside of the factory building 10, it is difficult to accurately measure the air flow likely to be discharged out of the factory building 10 through the ventilation part 110 When the wind speed meter 150 is installed at a position higher than 70% of the height of the interior of the factory building 10, the suction force of the dry dust collector 120 and the suction force of the factory dust- The accuracy of the wind speed measurement on the ascending air current inside the factory building 10 can be lowered due to the influence of the outside wind. Accordingly, the wind speed meter 150 is preferably installed at a height of 30 to 70% of the height from the floor to the roof of the factory building 10, as described above.

The mist sprayer 130 is provided at an inlet of the ventilation unit 110 inside the factory building 10 and can spray water particles.

In one embodiment, the mist injector 130 may inject water particles horizontally at the inlet of the vent 110 such that water particles are sprayed over the inlet of the vent 110.

The water particles sprayed from the mist sprayer 130 are piled up with the rising air stream and collide with the dust that has flowed to the ventilation part 110 to form large dust particles so that the dust can be dropped to the floor of the factory building 10 by gravity have.

Table 1 below shows experimental data on the emission dust reduction efficiency according to the size of water particles sprayed from the mist sprayer 130.

Water particle size
(탆) Injection quantity
(mL / s) Initial dust concentration
(μg / m ³ ) Dust concentration at inlet of ventilation
(μg / m ³ ) Dust reduction efficiency
(%) Less than 7.5 10 1,530 1,260 18 10-100 50 1,345 318 76 100-1000 200 1,595 1,140 29

As shown in Table 1, when the water particle size is 10 to 100 μm, the dust reduction efficiency is the highest at 76%.

Further, when the water particle size is less than 7.5 mu m and is in the dry form, although the water particle has a high chance of collision with the dust, the dust weight is lighter, so that the water particle flows by gravity in an upward flow (for example, 1.0 to 5.0 m / s) And can be discharged to the outside of the factory building 10 through the ventilation unit 110 without sitting.

In addition, when the water particle size is 100 to 1000 탆, the water particle size is large and there is little chance of colliding with the dust, which reduces the dust reduction efficiency. Furthermore, when the water particles are excessively large, the amount of water injection is large, which may affect the steelmaking process.

Accordingly, in one embodiment, the mist sprayer 130 may be configured to spray 10 to 100 탆 water particles having the best dust reduction efficiency in consideration of a special environment of the steelmaking process, but the present invention is not limited thereto.

Also, in one embodiment, a plurality of mist ejectors 130 may be installed to correspond to the plurality of ventilation units 110 on a one-to-one basis.

The dry dust collector 120 may be disposed on the roof of the factory building 10 and disposed below the mist sprayer 130 to suck suspended dust suspended on the roof side of the factory building 10.

The dry dust collector 120 is capable of sucking the raised dust piled up on the ascending air flow. Particularly, the dry dust collector 120 may collide with water particles sprayed from the mist sprayer 130, drop water, evaporate water, and suck up dust rising in a rising air stream.

The amount of dust discharged to the ventilation unit 110 through the cooperation of the dry dust collector 120 and the mist sprayer 130 can be remarkably reduced.

The control unit 160 may control the amount of water particles injected by the mist injector 130 based on the dust concentration measured by the dust meter 140 and the wind speed measured by the wind speed meter 150.

The control unit 160 operates the mist injector 130 when the dust concentration measured by the dust meter 140 is equal to or higher than a predetermined set concentration and the wind speed measured by the wind speed meter 150 is equal to or higher than a predetermined set wind speed, The operation of the mist injector 130 can be stopped when the dust concentration measured by the dust meter 140 is less than the preset concentration and the wind speed measured by the wind speed meter 150 is less than the set wind speed.

Generally, the process in which the dust is most generated in the steelmaking process is the charging process of the converter 20 and the oxygen purging process. Therefore, the time for discharging the high concentration of dust to the ventilation part 110 during the steelmaking process of about 40 minutes is only about 1 to 2 minutes.

The controller 160 turns on and off the mist injector 130 on the basis of the dust concentration measurement value and the wind speed measurement value so that when the dust is discharged through the ventilator 110, And if the dust emission through the ventilation part 110 is not expected, the spraying of the water particles can be stopped to minimize the influence on the moisture of the steelmaking process.

In addition, when the mist sprayer 130 is operated, the controller 160 can automatically adjust the spray amount of the water particles to an appropriate level based on the dust concentration and the wind speed.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims I would like to make it clear.

10: Factory Building 20: Converter
100: Exhaust dust reduction device
110: ventilation part 120: dry dust collector
130: mist sprayer 140: dust meter
150: wind speed meter 160:

Claims (8)

A ventilation part provided in the building;
A dust measuring unit provided inside the building for measuring a dust concentration inside the building;
An air flow meter provided inside the building for measuring the wind speed of the air flowing inside the building; And
A mist injector provided in the ventilation part for spraying water particles;
And an exhaust emission control device.
The method according to claim 1,
And a controller for controlling the water particle injection amount of the mist sprayer based on the dust concentration measured by the dust detector and the wind speed measured by the wind speed meter.
The method according to claim 1,
Wherein the ventilation part is provided on a roof of the building,
And the wind speed meter is configured to measure the wind speed of the upward flow toward the ventilation part.
The method according to claim 1,
Wherein the dust meter and the wind speed meter are installed at a height of 30% to 70% of the height from the floor to the roof of the building.
The method according to claim 1,
Wherein the mist sprayer injects water particles of 10 to 100 mu m in diameter.
The method according to claim 1,
Wherein the building is provided with a dry dust collector for sucking suspended dust below the mist sprayer.
3. The method of claim 2,
Wherein,
When the dust concentration measured by the dust meter is equal to or higher than a predetermined set concentration and the wind speed measured by the wind speed meter is equal to or higher than a predetermined set wind speed,
And stops the operation of the mist sprayer when the dust concentration measured by the dust meter is less than the predetermined concentration and the wind speed measured by the wind speed meter is less than the set wind speed.
The method according to claim 1,
A facility for performing a steelmaking process is provided in the inside of the building,
Wherein the mist sprayer sprays water particles in the building during a steelmaking process so that the dust particles floating to the ventilation portion collide with water particles.

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