KR101973473B1 - System of reducing exhaust dust for dust collecting equipment - Google Patents

Abstract

The present invention provides a dust emission reduction system for a dust collecting device including a plurality of filters connected in parallel. The system comprises: a dust collecting step of sucking air containing dust to filter the dust; a dust removing step of jetting compressed air to the filter to removed dust attached to the filter; and a blowing step of returning the fine dust introduced into a filter inner space in the dust removing step to the filter. Since the plurality of filters is periodically blown to remove the dust, efficiency and reliability of the device can be enhanced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system for reducing particulate emission in a dust collecting apparatus, and more particularly, to a dust collecting apparatus capable of reducing the amount of dust to be discharged by returning dust, The present invention relates to a dust emission reduction system of a facility.

The dust collecting device is a device for separating and collecting dust, mist, and the like from the process gas, and includes a pretreatment and an auxiliary equipment necessary for this purpose. The kind of the dust collecting device is classified into a gravity dust collecting device, an inertial force collecting device, a centrifugal force collecting device, an acoustic dust collecting device, a washing dust collecting device, a filtration device, and the like by owing to an effective force for collecting gravity, inertia force, centrifugal force, adhesion force, hydrophilic force, A dust collecting device, and an electric dust collecting device. .

In recent years, filtration and dust collecting apparatuses are often used in order to improve air pollution prevention and working environment, and filters are installed to filter fine dust particles and the like with high efficiency.

The use of a filter has the advantage of increasing the efficiency of dust collection by increasing the particle capture rate. However, if the dust layer is excessively formed on the surface of the filter, the pressure loss is increased.

There are reversing method and pulse jet method for exhausting method, and pulse jet method is a method for injecting compressed air instantaneously at the upper part of filter through solenoid valve and blow pipe. In the case of exhaustion of the pulse jet method, when the high-pressure air is injected, the filter is instantaneously expanded, and the pores of the filter are instantaneously expanded, so that the fine dust may flow into the filter and increase the dust emission amount of the dust collecting apparatus.

Regarding the method of treating the dust discharged from the dust collecting facility, Korean Patent No. 10-1532336 'dust collecting facility and dust treatment method' (hereinafter referred to as 'patent document 1') smoothly transfers the dust to the treatment place Dust collection facility and dust treatment method.

1, a filter 20 for filtering dust-containing gas collected in a dust-generating area and separating the dust-containing gas into dust and gas is provided. The filter 20 is provided below the filter 20, and the filter 20 And a conveyor 40 provided inside the housing for conveying dust to the outlet side of the housing, and a conveyor 40 for conveying the dust to the outlet side of the housing. The accumulated dust can be smoothly discharged without stopping the operation of the facility.

However, Patent Document 1 discloses only a method of treating separated dust after exhaustion, and there is still a problem that the dust remaining in the filter can not be processed.

Regarding the technique for controlling the dust discharged to the outside of the dust collecting apparatus, Korean Patent No. 10-0743026 'Damper outlet damper preventing apparatus for preventing abnormal closure' (hereinafter referred to as Patent Document 2) When the supply pressure is lowered due to an abnormality of the air line operating the operating cylinder, it is automatically detected to prevent the damper from falling, thereby preventing the discharge flow path of the clean gas from being blocked, do.

However, Patent Document 2 discloses a technology for cutting off the exhaust gas when an abnormality occurs in the dust collecting apparatus, but does not disclose a technique for treating the residual dust inside the filter.

Accordingly, the present invention proposes a method of improving facility performance by preventing the dust remaining in the filter from being discharged to the outside of the facility.

Korean Patent No. 10-1532336 Korea Patent No. 10-0743026 Korean Patent No. 10-1674201

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art, and presents the following problems to be solved.

First, an air flow path is added to the dust collecting facility to return the dust remaining in the filter internal space to be able to be filtered again, thereby reducing the amount of dust emitted to the outside of the facility.

Second, the plurality of filters are periodically drained and blown to maintain the performance of the connected filters and to reduce the dust emission concentration of the equipment.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

The dust-collecting apparatus dust emission reduction system according to the present invention has the following problem solution to the above-mentioned problem to be solved.

According to the present invention, there is provided an air cleaner comprising: an inflow passage for guiding air containing dust, which is installed at one end of the hood and introduced into the hood; and a discharge duct for guiding air sucked by the suction fan, A plurality of filter modules connected in parallel between the inflow passage and the discharge passage, the plurality of filter modules being controlled in a dust collecting, discharging and blowing process by a control unit, and fine dusts introduced into the filter module through the discharging process; And a blowing passage formed so as to return to the filter module again.

According to an embodiment of the present invention, in order to control the above-described processes, each filter module includes a filter having a filter for filtering dust, compressed air blown into dust inside the filter by spraying compressed air, A discharge pipe valve branched from the discharge flow passage and connected to the discharge pipe to control the discharge of the filtered air in the filter internal space; and an inlet pipe branched from the inlet pipe and connecting the filter A blowing inlet pipe valve mounted on a blowing inlet pipe connecting the discharge pipe and the blowing flow passage and a blowing blowing pipe connecting the blowing pipe to the blowing pipe, And an air outlet pipe valve to be mounted.

According to an embodiment of the present invention, the controller controls the plurality of filter modules to perform the dust collecting process, and at least one filter module controls the dust removing and blowing processes.

According to an embodiment of the present invention, the control unit opens the inlet pipe valve and the outlet pipe valve of the plurality of filter modules, closes the blowing inlet pipe valve and the blowing pipe valve, and filters the air filtered through the plurality of filters through the suction fan Controlling the performance of the dust collection process to close the inlet pipe valve and the outlet pipe valve of the at least one filter module and opening the blowing inlet pipe valve and the blower pipe valve to drive the blower, To control the blowing process performance.

According to an embodiment of the present invention, the control unit closes the blowing inlet pipe valve and the blower pipe valve of the at least one filter module at the completion of the blowing process of the at least one filter module, And the blower pipe valve.

The method may further include the steps of: (a) a dust collecting process step of sucking air containing dust into the dust to filter the dust; (b) (C) a blowing step of returning the fine dust introduced into the filter inner space in the filtering process to the filter. The present invention also provides a dust collecting device dust emission reducing method comprising the steps of:

According to an embodiment of the present invention, the dust collecting step includes opening the inlet pipe valve and the outlet pipe valve of the plurality of filters connected in parallel, and air containing dust flowing along the inlet pipe flows through the inlet pipe to the plurality of filters And the dust-removed air is collected through the discharge pipe and discharged along the discharge channel.

According to an embodiment of the present invention, in the discharging process, at least one of the inlet pipe valve and the outlet pipe valve of the filter in the dust collecting process is closed and the compressed air is sprayed into the filter inner space, .

According to an embodiment of the present invention, in the blowing process step, the blowing inlet pipe valve and the blowing pipe valve of the at least one strainer in which the exhausting process step is completed are opened and the blower is driven, And returning the air containing the fine dust of the air to the filter inner space through the air blowing passage.

According to an embodiment of the present invention, the draining process step and the blowing process step are sequentially performed in a plurality of filters connected in parallel at regular intervals.

The dust-collecting device dust emission reduction system according to the present invention having the above-described structure provides the following effects.

First, dust remaining in the filter inner space after exhausting the exhaust gas is circulated to the filter inlet portion without being exhausted to the outside, so that the amount of dust detected at the exhaust outlet portion can be drastically reduced. This makes it possible to provide facilities that comply with enhanced emission control regulations.

Second, it is possible to reduce the amount of dust emission by adding a ventilation flow path structure to a conventional dust collection facility, so that it is possible to minimize the investment for reducing dust emission amount.

Third, it is possible to permanently use improved performance dust collection facilities through the flow design, which can reduce maintenance and repair costs.

Fourth, since the plurality of filters are periodically drained and blown, the efficiency and reliability of the equipment can be improved.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a conceptual view showing the structure of a conventional dust collecting apparatus.
2 is a conceptual view illustrating a structure of a dust collecting apparatus according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a process for removing residual dust in a filter internal space of a dust collecting apparatus according to an embodiment of the present invention.
4 is a conceptual diagram illustrating a structure of a filter according to an embodiment of the present invention.
FIG. 5 is a conceptual diagram for explaining the principle in which fine dust is introduced into the filter internal space when the pulse jet type exhaustion is performed.
FIG. 6 is a conceptual diagram for explaining a change in amount of dust discharged from a dust collecting apparatus to which the present invention is applied.

Hereinafter, the present invention will be described in more detail with reference to the drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In addition, the suffix " module " and " part " for constituent elements used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

1 is a conceptual view showing the structure of a conventional dust collecting apparatus.

1, the conventional dust collecting apparatus includes a collecting section for sucking dust-containing gas from the dust generating site into the dust collecting hood 10 and the inlet duct 12 by the attracting pressure of the suction fan 34, A filtration unit for separating the gas into gas and dust by filtration, and an exhaust unit for discharging the filtered gas to the atmosphere.

The dust collecting hood 10 may be installed in a dust generating place, for example, a facility for transporting raw materials used in a blast furnace or a facility for producing coke. The dust collecting hood 10 is connected to the filtering unit through an inlet duct 12, Is connected to a suction fan (34) connected to the filtration part, and sucks the dust containing gas by the suction pressure of the suction fan (34) and transfers it to the filtration part through the inlet duct (12).

The filtration section may include a filter 20 for filtering the dust-containing gas transferred through inlet duct 12 to separate dust and gas. The filter 20 includes a filter chamber containing a dust-containing gas and a filter provided in the filter chamber to filter the dust-containing gas to separate the gas and dust.

The exhaust unit may include a suction fan 34 connected to the filter chamber through a pipe, and a stack 36 for discharging the gas to the outside. The gas separated from the filter chamber by the suction force of the suction fan 34 is discharged to the stack 36 through the exhaust pipe 32.

The structure of such a conventional dust collecting apparatus may be partially or entirely reflected in the dust collecting apparatus of the present invention described below.

FIG. 2 is a conceptual view illustrating a structure of a dust collecting apparatus according to an embodiment of the present invention. FIG. 3 is a view illustrating a process of removing residual dust 123 in an internal space 123 of a filter 1000 of a dust collecting apparatus according to an embodiment of the present invention. It is a flowchart.

Referring to FIG. 2, the present invention may further include a structure capable of filtering residual dust in the internal space 123 of the filter 1000, in addition to the conventional dust collecting structure.

Specifically, the dust collecting apparatus may include an inlet flow path 110, a plurality of filters 120, a discharge flow path 130, an air flow path 140, and the like.

The inflow channel 110 includes a hood 111, an inflow pipe 112, and an inflow pipe valve 113.

The hood 111 is connected to a plurality of filters 120 through an inlet pipe 112 and sucks dust by driving a suction fan 134 connected to the exhaust passage 130.

The inlet pipe valve 113 is connected to the connection portion between the filter 120 and the inlet pipe 112. The inlet pipe valve 113 can be opened or closed in conjunction with the outlet pipe valve 133. In other words, when the inlet pipe valve 113 is opened, the outlet pipe valve 133 is also opened to suck the gas, and when the inlet pipe valve 113 is closed, the outlet pipe valve 133 is also closed to discharge the dust .

The plurality of filters 120 have a filter 1000 therein. The number of filters 120 may be adjusted according to the size of the dust collector. The filters 120 sequentially perform the draining process and the circulation process to prevent dust from being accumulated in any one of the filters 120 to deteriorate performance. The internal structure of the filter 120 will be described in detail below with reference to FIG.

The discharge passage 130 includes a discharge pipe 132, a discharge pipe valve 133, a suction fan 134, a stack 135 and the like.

The suction fan 134 is connected to the filter 120 through the discharge pipe 132 and the stack 135 is connected to the suction fan 134 to discharge the gas sucked from the filter 120 to the outside.

The discharge pipe valve 133 is connected to the connection portion between the filter 120 and the discharge pipe 132. The discharge pipe valve 133 can be opened or closed in conjunction with the inlet pipe valve 113. In other words, when the discharge pipe valve 133 is opened, the inlet pipe valve 113 is also opened to suck the gas, and when the discharge pipe valve 133 is closed, the inlet pipe valve 113 is also closed to discharge the dust .

The air blowing passage 140 may include a blowing air inflow pipe 141, an air blowing out pipe 142, a blower, a blowing air inflow pipe valve 144, a blowing air pipe valve 145,

The blower is connected to the discharge pipe 132 through the blowing inlet pipe 141 and is connected to the inlet pipe 112 through the blowing outlet pipe 142.

A blowing inlet pipe valve 144 is formed in the blowing inlet pipe 141 and an air blowing pipe valve 145 is formed in the blowing pipe 142.

The blower pipe valve 145 can be opened or closed by interlocking with the blower inlet pipe valve 144. In other words, when the blow-off pipe valve 145 is opened, the blow-in inlet pipe valve 144 is also opened to suck the gas (residual dust) in the filter internal space 122, and when the blow-off pipe valve 145 is closed, (144) are closed together to prevent the gas from circulating inside the filter (120).

Referring to FIG. 3, in order to remove residual dust in the internal space 123 of the filter 1000, the dust collecting apparatus of the present invention includes a step S110 in which the inlet pipe valve is opened and dust is introduced into the filter internal space 122, A step S120 of filtering the dust introduced into the internal space 122 by the filter 1000, a step S130 of removing dust adhering to the filter 1000 by injecting the compressed air, (S140) of returning the residual dust to the filter inner space 122 by performing the process of step S140.

The dust collecting process includes a step S110 in which the inlet pipe valve is opened and dust is introduced into the filter internal space 122 and a step S120 in which the dust introduced into the filter internal space 122 is filtered by the filter 1000 .

In the dust collecting process, the inlet pipe valve and the outlet pipe valve 133 are opened, and the gas is sucked into the filter 120 by the suction force of the suction fan 134 connected to the discharge pipe 132. The sucked gas is discharged to the discharge pipe 132 through the filter 1000 and the dust present in the gas is filtered by the filter 1000. During the dust collecting process, the air inlet pipe valve 144 and the air outlet pipe valve 145 are kept closed.

The draining process and the blowing process are sequentially performed for each of the filters 120, and are repeated at regular intervals.

In the draining process, compressed air is sprayed to remove dust attached to the filter 1000 (S130).

During the draining process, the inlet pipe valve and the outlet pipe valve 133 are closed and the compressed air is injected into the filter 1000 to free dust attached to the surface of the filter 1000.

In the blowing step, the dust remaining in the inner space 123 of the filter 1000 is returned to the inlet of the filter 120 (S140).

The blowing inlet pipe valve and the blowing pipe valve 145 are opened and the gas in the internal space 123 of the filter 1000 is returned to the inlet of the filter 120 by the suction force of the blower disposed in the blowing passage 140 . The regenerated gas is again exhausted through the filter 1000 to the exhaust pipe 132 and the dust present in the gas returned by the filter 1000 is re-filtered. During this blowing process, the inlet pipe valve 113 and the outlet pipe valve 133 are kept closed.

According to the structure of the present invention as described above, fine dust introduced into the filter 1000 during the dust cancellation can be filtered to prevent dust from being discharged to the outside of the dust collecting apparatus (see FIGS. 5 and 6).

The particulate emission control system according to an embodiment of the present invention may include a controller for controlling the above-described processes. 4 is a conceptual diagram for explaining an embodiment of a filter applicable to the present invention. 4 (a) shows the moving direction of the air during the dust collecting device dust collecting process, and (b) shows the moving direction of the air during the dust removing process of the dust collecting device.

4A, the interior of the filtration member 1100 maintains a lower pressure state than the outside during the collection process of the dust collector, so that the outside air of the filtration member 1100 passes through the filtration member 1100 And then discharged through the through holes.

4 (b), the interior of the filtration member 1100 during the dust removal process of the dust collector maintains a higher pressure state than the outside by the injection of the compressed air, and the inside of the filtration member 1100 The injected compressed air passes through the filter member 1100 and is discharged to the outside, thereby freeing the dust adhering to the surface of the filter member 1100.

In this way, the dust adhering to the surface of the filter member 1100 can be released during the dust removing process, and a small amount of fine dust can be introduced into the filter member. This will be described below with reference to FIG.

FIG. 5 is a conceptual diagram for explaining the principle in which fine dust is introduced into the filter internal space when the pulse jet type exhaustion is performed.

Referring to FIG. 5, the inside of the filter member 1100 during the dust removal process of the dust collector maintains a higher pressure state than the outside by the injection of the compressed air, and the filter member expands momentarily due to the increased internal pressure.

 As the filtration member expands outward, small gaps existing in the filtration member become large, and external fine dust can flow into the filtration member through the gap.

The amount of dust discharged from the dust collecting apparatus tends to increase periodically due to fine dust introduced into the space inside the filter member. According to the structure of the present invention as described above, the fine dust introduced into the internal space of the filter member can be filtered again, and the amount of dust discharged to the outside of the facility can be drastically reduced.

FIG. 6 is a conceptual diagram for explaining a change in amount of dust discharged from a dust collecting apparatus to which the present invention is applied. Fig. 6 (a) shows a change in the amount of dust discharged to the outside of the dust collecting apparatus when dust is drained without driving the air passage, Fig. 6 (b) Indicates the change in the amount of dust discharged to the outside of the dust collecting facility.

According to the present invention, the dust collecting apparatus includes a plurality of filters. The number of filters can be increased depending on the size of the dust collecting apparatus, and in the case of a large dust collecting apparatus, generally, the number of the filters is 6 or more.

The plurality of filters perform the draining process and the blowing process at regular intervals. Each filter sequentially performs this process to prevent dust from accumulating in one filter, thereby degrading performance.

For example, after a certain period of time has elapsed from the time t1 when the exhausting and blowing processes have been performed in the first filter, the exhausting and blowing processes are performed in the second filter (t2), and after a certain period of time, And a blowing step are performed (t3).

According to the experimental results, the average value of the dust amount discharged to the outside of the dust collecting apparatus after the dust removing process when the dust removing operation is performed without driving the air flow path is about 5 mg (see FIG. 6A) When the fine dust in the internal space of the filtration member is re-filtered, it is confirmed that the average value of the amount of dust discharged to the outside of the dust collecting apparatus after the dust exhaustion and blowing process is reduced to about 2 mg (see FIG.

According to at least one embodiment of the present invention, dust remaining in the internal space of the filter after exhausting the exhaust gas is circulated to the inlet of the filter without being exhausted to the outside, The amount can be drastically reduced. This makes it possible to provide facilities that comply with enhanced emission control regulations. In addition, since the dust discharge amount can be reduced by adding the air flow path structure to the conventional dust collecting apparatus, it is possible to minimize the investment for reducing dust emission amount, and it is possible to permanently use the improved performance dust collecting apparatus through the flow path design Maintenance and repair costs can be reduced. In addition, since the plurality of filters are periodically drained and blown, the efficiency and reliability of the equipment can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

111: hood 110: inflow channel
112: inlet pipe 113: inlet pipe valve
120: filter 122: inner space of the filter
123: filter interior space 130: exhaust flow path
132: discharge pipe 133: discharge pipe valve
134: Suction fan 135: Stack
140: air blowing passage 141: blowing inlet pipe
142: blower pipe 143: blower
144: blowing inlet pipe valve 145: blowing outlet pipe valve
1000: filter 1100: filtration member

Claims (10)

A plurality of filter modules connected in parallel to each other and sequentially controlled by a control unit to collect dust, drain and blow process;
An inflow channel for guiding air including dust introduced into the hood to the plurality of filter modules;
An inflow pipe branched from the inflow channel and connected to each filter module;
Inlet pipe valves formed in the inlet pipes to independently block air flowing into the filter modules from the inlet channel;
A discharge duct for guiding the filtered air through the filter module to the outside;
Discharge pipes branched from the discharge passage and connected to the respective filter modules;
Discharge pipe valves formed in each discharge pipe and configured to be paired with an inlet pipe valve connected to each filter module;
A suction fan mounted on the discharge passage for applying a suction force to the air flowing through the inlet pipe;
An air blowing passage formed to return air containing fine dust introduced into the filter module to the filter module again by the dust removing process;
Blowing inlet pipes branched from the blowing passage and connected to the respective discharge pipes;
Ventilation ducts branched from the air flow passage and connected to the respective inflow pipes;
Blowing inlet pipe valves mounted on the blowing inlet pipes;
Blowing and discharging pipe valves mounted on the blowing pipes and configured to be paired with blowing pipe valves connected to the respective filter modules; And
And a blower for applying a suction force so that air can be returned through the air flow passage. The method according to claim 1,
In order to control the above processes, each filter module comprises:
A filter having a filter for filtering dust;
A compressed air injecting unit injecting compressed air into the filter space to free dust adhering to the filter;
A discharge pipe valve that is branched from the discharge passage and is attached to a discharge pipe connecting the filter to control the discharge of the filtered air in the filter internal space;
An inflow pipe valve which is branched from the inflow path and is connected to the inflow pipe connecting the filter and controls suction of dust-containing air through the hood;
A blowing inlet pipe valve mounted on a blowing inlet pipe connecting the discharge pipe and the airflow passage; And
A blowing / discharging pipe valve mounted on a blowing / discharging pipe connecting the inflow pipe and the blowing passage;
And a dust collecting device for collecting dust. 3. The method of claim 2,
Wherein,
Wherein the plurality of filter modules are controlled to perform a dust collecting process, wherein at least one filter module controls the dust removing and blowing process. The method of claim 3,
Wherein,
The inlet pipe valve and the outlet pipe valve of the plurality of filter modules are opened, the blowing inlet pipe valve and the blowing pipe valve are closed, the filtered air is sucked through the plurality of filters through the suction fan,
Closing the inlet pipe valve and the outlet pipe valve of the at least one filter module, opening the blowing inlet pipe valve and the blower pipe valve, and driving the blower to return air in the at least one filter module to control the blowing process Wherein the dust emission reduction system comprises: 5. The method of claim 4,
Wherein,
And closing the blowing inlet pipe valve and the blowing pipe valve of the at least one filter module when the blowing process of the at least one filter module is completed and opening the blowing inlet pipe valve and the blower pipe valve of the other filter module Dust Collecting Facility Dust Emission Reduction System. A dust collection facility dust reduction method comprising a plurality of filters connected in parallel,
(a) a dust collecting process step of sucking air containing dust to filter dust;
(b) a de-dusting step of spraying compressed air to the filter to remove dust adhering to the filter; And
(c) a blowing process step of returning the fine dust introduced into the filter internal space to the filter in the exhaust process,
The dust collecting apparatus includes:
A plurality of filter modules connected in parallel to each other and controlled by a control unit for dust collection, draining, and blowing processes;
An inflow channel for guiding air including dust introduced into the hood to the plurality of filter modules;
An inflow pipe branched from the inflow channel and connected to each filter module;
Inlet pipe valves formed in the inlet pipes to independently block air flowing into the filter modules from the inlet channel;
A discharge duct for guiding the filtered air through the filter module to the outside;
Discharge pipes branched from the discharge passage and connected to the respective filter modules;
Discharge pipe valves formed in each discharge pipe and configured to be paired with an inlet pipe valve connected to each filter module;
A suction fan mounted on the discharge passage for applying a suction force to the air flowing through the inlet pipe;
An air blowing passage formed to return air containing fine dust introduced into the filter module to the filter module again by the dust removing process;
Blowing inlet pipes branched from the blowing passage and connected to the respective discharge pipes;
Ventilation ducts branched from the air flow passage and connected to the respective inflow pipes;
Blowing inlet pipe valves mounted on the blowing inlet pipes;
Blowing and discharging pipe valves mounted on the blowing pipes and configured to be paired with blowing pipe valves connected to the respective filter modules; And
And a blower for applying a suction force to return the air through the air passage. The method according to claim 6,
Wherein the dust collecting step comprises:
The inlet pipe valve and the outlet pipe valve of the plurality of filters connected in parallel are opened to divide the air including the dust introduced along the inflow channel into the internal space of the plurality of filters through the inflow pipe, Wherein the air is collected through a discharge pipe and discharged along a discharge flow path. 8. The method of claim 7,
The step of draining,
Wherein at least one filter of at least one of the dust collecting process steps closes the discharge pipe valve and the compressed air is sprayed into the filter space to exhaust the dust layer attached to the filter outer surface. . 9. The method of claim 8,
Wherein the blowing step comprises:
The blowing inlet pipe valve and the blowing and blowing pipe valve of the at least one filter having completed the discharging process step are opened and the blower is driven so that air containing fine dust in the filter internal space introduced during the discharging process step is blown through the blowing passage, And returning to the dust collecting facility dust emission reducing method. 10. The method of claim 9,
Wherein the dust removing process step and the blowing process step are sequentially performed in a plurality of filters connected in parallel at predetermined intervals.

Images