WO2020013575A1

WO2020013575A1 - Dust emission reduction system for dust collection equipment

Info

Publication number: WO2020013575A1
Application number: PCT/KR2019/008428
Authority: WO
Inventors: 서명조; 정철; 문영실; 황상연
Original assignee: 주식회사 마이크로원
Priority date: 2018-07-09
Filing date: 2019-07-09
Publication date: 2020-01-16
Also published as: KR101973473B1

Abstract

The present invention provides a dust emission reduction system for dust collection equipment, the system comprising a plurality of filtering apparatuses connected in parallel. The dust emission reduction system for dust collection equipment comprises: a dust collection process step for suctioning air containing dust, and filtering the dust; a dust removal process step for removing dust attached to filters by spraying the filters with compressed air; and a blowing process step for returning, to the filtering apparatuses, fine dust introduced into the inner spaces of the filters in the dust removal process.

Description

Dust collection system dust emission reduction system

The present invention relates to a system for reducing dust emissions of dust collection equipment, and more particularly, dust collection that can reduce the amount of dust discharged by returning the dust introduced into the filter when the filter is exhausted back to the inside of the filter through the blower. The present invention relates to a facility dust emission reduction system.

The dust collector is a device that separates dust, mist, and the like from the processing gas, and includes a pretreatment and auxiliary equipment required for this purpose. Types of dust collectors include gravitational dust collectors, inertial dust collectors, centrifugal dust collectors, sonic dust collectors, cleaning dust collectors, filtration by the effective forces for dust collection such as gravity, inertia, centrifugal force, adhesion, hydrophilicity and electric force acting on the particles. Dust collector, electric dust collector and the like. .

In recent years, in order to prevent air pollution and improve the working environment, a filter dust collecting device is often used, and fine dust particles and the like have been filtered by installing a filter.

In the case of using a filter, there is an advantage of increasing the dust collection efficiency by increasing the particle capture rate, but if the dust layer is excessively formed on the surface of the filter, the pressure loss rises, so periodic exhaustion is necessary.

There is a reverse type and a pulse jet type in the exhaust type, and the pulse jet type is a method of spraying compressed air instantaneously from the upper part of the filter through a solenoid valve and a blow pipe. In the case of pulse jet type dust extraction, when the high-pressure air is injected, the filter expands momentarily and the pores of the filter expand instantly. Thus, fine dust flows into the filter, thereby increasing the dust emission of the dust collector.

Regarding the method for treating dust discharged from the dust collecting facility, Korean Patent No. 10-1532336 'Collecting Facility and Dust Treatment Method' (hereinafter referred to as 'Patent Document 1') smoothly transports dust to a treatment site. Dust collection facilities and dust treatment methods are proposed.

Referring to FIG. 1, in Patent Document 1, a filter 20 for filtering dust-containing gas collected in a dust generating area to separate dust and gas, and a lower portion of the filter 20 and an upper portion of the filter 20. Inlet is formed in the inlet for the dust is separated from the inlet, the housing is formed in the discharge outlet is discharged on the lower side, and the transporter 40 for transporting the inlet dust is provided in the housing to the outlet side, etc. Including the 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 in that dust remaining in the filter cannot be processed.

Regarding the technology for controlling the dust discharged to the outside of the dust collector, the Republic of Korea Patent No. 10-0743026 'abnormal closing prevention device of the dust collector outlet damper' (hereinafter referred to as 'Patent Document 2') for the damper driving of the dust collector When the supply pressure is lowered due to the abnormality of the air line that operates the operation cylinder, it automatically senses it and prevents the damper from falling down to block the flow path of the clean gas, thereby preventing the emission of air from the exhaust gas and preventing environmental pollution. do.

However, Patent Document 2 discloses only a technique for blocking the exhaust gas when an abnormality occurs in the dust collector, and does not disclose a technique for treating residual dust inside the filter.

Therefore, the present invention is to propose a method that can improve the performance of the facility by preventing the dust remaining inside the filter is discharged to the outside of the installation.

Dust collection system dust emission reduction system according to the present invention has been devised to solve the conventional problems as described above, proposes the problem to be solved as follows.

First, a system is provided to reduce the amount of dust discharged to the outside of the facility by adding a blow passage to the dust collecting facility and returning the dust remaining in the filter space to be refiltered.

Secondly, a plurality of filters are periodically exhausted and blown to maintain the performance of the connected filters and to reduce the dust emission concentration of the facility.

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

Dust collection equipment dust emission reduction system according to the present invention has the following problem solving means for the problem to be solved above.

According to the present invention, an inflow passage for guiding air including dust introduced into the hood at one end of the hood, and an exhaust passage for guiding the sucked air to the outside by applying suction to the hood with a suction fan And a plurality of filter modules connected in parallel between the inflow passage and the discharge passage and controlled by a control unit for collecting, dedusting, and blowing air, and air including fine dust introduced into the filter module by the dedusting process. It provides a dust collection system dust emission reduction system having a ventilation flow path that is formed to return back to the filter module.

According to an embodiment of the present invention, in order to control the above processes, each filter module includes a filter having a filter for collecting dust, and compressed air for releasing dust adhered to the filter by spraying compressed air into the filter inner space. A discharge pipe valve mounted on an injection pipe, a discharge pipe branched from the discharge flow path and connecting the filter, and controlling a discharge of filtered air in the internal space of the filter, and an inlet pipe branched from the inflow flow path and connected to the filter. An inlet pipe valve mounted to control the intake of dust-containing air through the hood, a blower inlet pipe valve mounted to a blower inlet pipe connecting the outlet pipe and the blower flow path, and a blower outlet pipe connecting the inlet pipe and the blower flow path. And a blower exhaust valve mounted.

According to an embodiment of the present invention, the control unit controls the plurality of filter modules to perform the dust collecting process, and at this time, the at least one filter module controls to perform the dedusting and blowing process.

According to an embodiment of the present invention, the control unit opens the inlet and outlet pipe valves of the plurality of filter modules, closes the air inlet pipe valve and the air outlet pipe valve, and filters the air filtered through the plurality of filters through the suction fan. Intake is controlled to control the dust collection process, the inlet and outlet pipe valves of the at least one filter module are closed, the blower inlet pipe valve and the blower pipe valve are opened, and the blower is driven to operate the air inside the at least one filter module. To control the blowing process performance.

According to an embodiment of the present invention, the control unit closes the blower inlet pipe valve and the blower discharge pipe valve of the at least one filter module when the blowing process of the at least one filter module is completed, and the blower inlet pipe valve of the other filter module. And the blower discharge pipe is formed to open the valve.

In addition, the present invention is a dust collection method dust reduction method comprising a plurality of filters connected in parallel, (a) a dust collecting process step of filtering the dust by sucking the air containing the dust, and (b) compressed air to the filter It provides a dust collection process dust reduction process comprising a dust extraction step of removing the dust attached to the filter by spraying, and (c) a blowing process step of returning the fine dust introduced into the filter in the dust removal process to the filter.

According to one embodiment of the present invention, the dust collecting step is the inlet pipe of the plurality of filters connected in parallel and the discharge pipe valve is open air containing dust introduced along the inlet flow path through the plurality of filters through the inlet pipe After splitting into the interior space of the air, the air from which the dust is removed by the filter is collected through the discharge pipe and discharged along the discharge flow path.

According to one embodiment of the present invention, the dust removal process step is that the inlet and outlet pipe valves of at least one filter of the dust collection process step is closed and the compressed air is injected into the filter inner space is the dust layer adhering to the filter outer surface is exhausted Steps.

According to one embodiment of the present invention, the blowing step is an air inlet pipe valve and a blower discharge pipe valve of the at least one filter in which the dedusting step is completed, and the blower is driven, the filter internal space introduced during the dedusting step The air containing the fine dust of the return to the interior space of the filter through the air flow passage.

According to an embodiment of the present invention, the dedusting process step and the blowing process step are performed sequentially with a predetermined period in the plurality of filters connected in parallel.

The dust collecting system dust emission reduction system according to the present invention having the above configuration provides the following effects.

First, the dust remaining in the inner space of the filter after exhaustion is circulated to the filter inlet without being discharged to the outside can significantly reduce the amount of dust detected in the facility outlet. This makes it possible to provide equipment that meets tougher dust emission regulations.

Second, it is possible to minimize the investment to reduce the dust emissions because it can reduce the dust emissions by adding a blow passage structure to the conventional dust collector.

Third, it is possible to permanently use the dust collector with improved performance through the flow path design, thereby reducing maintenance and repair costs.

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

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

1 is a conceptual diagram showing the structure of a conventional dust collector.

Figure 2 is a conceptual diagram showing the structure of the dust collector according to an embodiment of the present invention.

3 is a flow chart showing a process for removing residual dust in the filter interior space of the dust collector according to an embodiment of the present invention.

4 is a conceptual diagram illustrating the structure of a filter according to an embodiment of the present invention.

FIG. 5 is a conceptual view illustrating a principle in which fine dust flows into a filter internal space when pulse jet exhaustion is performed.

6 is a conceptual view for explaining a change in the amount of dust discharged from the dust collector to which the present invention is applied.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar components in different embodiments, and the description thereof is replaced with the first description. As used herein, the singular forms "a", "an" and "the" include plural forms unless the context clearly indicates otherwise.

In addition, the suffixes "module" and "unit" for the components used in the following description are given or mixed in consideration of ease of specification, and do not have distinct meanings or roles from each other.

According to FIG. 1, a conventional dust collecting facility includes a collecting unit for sucking dust-containing gas from the dust generating place into the dust collecting hood 10 and the inlet duct 12 by the attraction pressure of the suction fan 34, and the collected dust-containing material. And a filtration unit for filtering the gas to separate the gas and dust, and an exhaust unit for discharging the filtered gas into the atmosphere.

The dust collection hood 10 may be installed at 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 collection hood 10 is connected to a filtration unit through an inlet duct 12, It is connected to the suction fan 34 which is connected to the filtration unit, and sucks the dust-containing gas by the attraction pressure of the suction fan 34 and transfers it to the filtration unit through the inlet duct 12.

The filter unit may include a filter 20 for separating dust and gas by filtering the dust-containing gas transferred through the inlet duct 12. The filter 20 includes a filtration chamber in which the dust-containing gas is accommodated, and a filter provided in the filtration chamber to filter the dust-containing gas to separate the gas and the dust.

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

The structure of the conventional dust collector may be partially or fully reflected in the dust collector of the present invention described below.

2 is a conceptual diagram showing the structure of the dust collector according to an embodiment of the present invention, Figure 3 shows a process for removing residual dust in the filter 1000, the inner space 123 of the dust collector according to an embodiment of the present invention. 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 structure of the conventional dust collector.

In detail, the dust collecting facility may include an inflow passage 110, a plurality of filters 120, a discharge passage 130, a blowing passage 140, and the like.

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

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

Inlet pipe valve 113 is connected to the connection portion of the filter 120 and the inlet pipe (112). Inlet pipe valve 113 may be opened or closed in conjunction with the discharge pipe valve (133). In other words, when the inlet valve 113 is opened, the outlet pipe valve 133 is also opened to suck in gas, and when the inlet pipe valve 113 is closed, the outlet pipe valve 133 is also closed together to discharge dust when the filter 120 is exhausted. To prevent.

The plurality of filters 120 includes 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 dedusting process and the circulation process to prevent dust from accumulating on any one filter 120 and deteriorating performance. The internal structure of the filter 120 will be described in detail with reference to FIG. 4 below.

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.

Discharge pipe valve 133 is connected to the connection portion of the filter 120 and the discharge pipe (132). The discharge pipe valve 133 may 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 in gas, and when the discharge pipe valve 133 is closed, the inlet pipe valve 113 is also closed to discharge dust when the filter 120 is exhausted. To prevent.

The blowing passage 140 may include a blowing inlet pipe 141, a blowing discharge pipe 142, a blower, a blowing inlet pipe valve 144, a blowing discharge pipe valve 145, and the like.

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

The blowing inlet pipe 141 is formed with a blowing inlet pipe valve 144 and the blowing discharge pipe 142 is formed with a blowing discharge pipe valve 145.

The blower discharge pipe valve 145 may be opened or closed in conjunction with the blower inlet pipe valve 144. In other words, when the blower discharge valve valve 145 is opened, the blower inlet pipe valve 144 is also opened to suck the gas (residual dust) in the filter internal space 122 and the blower inlet pipe valve when the blower discharge pipe valve 145 is closed. 144 is also closed together to prevent the gas from circulating inside the filter 120 during dust collection.

Referring to FIG. 3, in order to remove residual dust in the filter 1000, the dust collecting facility of the present invention opens an inlet valve so that dust is introduced into the filter internal space 122 (S110). The dust introduced into the inner space 122 is filtered by the filter 1000 (S120), the step of spraying compressed air to remove the dust attached to the filter 1000 (S130), and the blower valve valve is opened filter (1000) The internal space 123 may perform the process of step (S140) to return the residual dust to the filter internal space (122).

The dust collecting process includes a step (S110) of opening the inlet pipe valve to introduce dust into the filter internal space 122 and filtering the dust introduced into the filter internal space 122 by the filter 1000 (S120). .

In the dust collecting process, the inlet pipe valve and the discharge 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. The blower inlet pipe valve 144 and the blower discharge pipe valve 145 are kept closed during the dust collection process.

The dedusting process and the blowing process are sequentially performed for each filter 120, and are repeated at regular intervals.

In the dedusting process, compressed air is injected to remove dust stuck to the filter 1000 (S130).

During the dedusting process, the inlet pipe valve and the discharge pipe valve 133 are closed and compressed air is injected into the filter 1000 to release the dust adhered to the surface of the filter 1000.

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

During the blowing process, the blowing inlet pipe valve and the blowing discharge 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 flow path 140. . The returned gas is again discharged through the filter 1000 to the discharge pipe 132 and the dust present in the gas returned by the filter 1000 is refiltered. During the blowing process, the inlet pipe valve 113 and the outlet pipe valve 133 are kept closed.

By the structure of the present invention, it is possible to prevent the dust is discharged to the outside of the dust collector by re-filtering the fine dust flowing into the filter 1000 when the dust is exhausted (see Figs. 5 and 6).

Dust collection equipment dust emission reduction system according to an embodiment of the present invention may be provided with a control unit for controlling the above process. 4 is a conceptual diagram illustrating an embodiment of a filter that may be applied to the present invention. In FIG. 4, (a) shows the moving direction of air during the dust collecting process and (b) shows the moving direction of the air during the dust collecting process of the dust collecting facility.

As shown in Figure 4 (a), during the dust collection process of the dust collecting equipment, the interior of the filtering member 1100 maintains a lower pressure than the outside, so the outside air of the filtering member 1100 is the filtering member 1100 After passing through), it is filtered and discharged through the passage hole.

On the other hand, as shown in Figure 4 (b), during the dedusting process of the dust collector, the interior of the filtration member 1100 maintains a higher pressure than the outside by the injection of compressed air, into the filtration member 1100 The injected compressed air is discharged outward through the filtering member 1100 to liberate dust attached to the surface of the filtering member 1100.

As such, the dust attached to the surface of the filtration member 1100 may be released during the dust collection process and at the same time, a small amount of fine dust may be introduced into the filtration member. This will be described below with reference to FIG. 5.

Referring to FIG. 5, the inside of the filtration member 1100 is maintained at a higher pressure than the outside by the injection of compressed air during the dedusting process of the dust collecting facility, and the filtration member is momentarily expanded by the increased internal pressure.

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

Conventionally, the amount of dust discharged from the dust collection equipment has tended to increase periodically because of the fine dust introduced into the inner space of the filtration member. According to the structure of the present invention as described above it is possible to re-filter the fine dust flowing into the inner space of the filtering member and it is possible to significantly reduce the amount of dust discharged to the outside of the facility.

6 is a conceptual view for explaining a change in the amount of dust discharged from the dust collector to which the present invention is applied. In FIG. 6, (a) shows a change in the amount of dust discharged to the outside of the dust collecting facility when the dust is exhausted without driving the air flow passage, and (b) refilters the fine dust in the inner space of the filtration member by driving the air flow passage after exhaustion In this case, the amount of dust emitted to the outside of the dust collector is changed.

According to the present invention, the dust collector is provided with a plurality of filters. The number of filters can increase depending on the size of the dust collector, and large dust collectors usually have six or more strainers.

The plurality of filters performs the dedusting process and the blowing process at regular intervals. Each filter performs this process sequentially to prevent dust from accumulating and degrading in either filter.

For example, after a predetermined time passes from the time point t1 at which the dedusting and blowing process is performed in the first filter, the dedusting and blowing process is performed in the second filter (t2), and after a predetermined time passes, the dedusting is performed in the third filter. And a blowing step (t3).

According to the test results, when the dust is exhausted without driving the air flow passage, the average amount of dust discharged to the outside of the dust collecting facility after the dust removal process is about 5 mg (see FIG. 6 (a)). When re-filtering the fine dust in the inner space of the filter member it can be seen that the average value of the amount of dust discharged to the outside of the dust collector after the dedusting and blowing process is reduced to about 2mg (see Fig. 6 (b)).

According to at least one embodiment of the present invention, the dust collection system dust emission reduction system, dust remaining in the filter inner space after the dust is discharged to the filter inlet without being discharged to the outside of the dust detected by the facility discharge unit The amount can be significantly reduced. This makes it possible to provide equipment that meets tougher dust emission regulations. In addition, it is possible to minimize the investment to reduce the dust emissions by adding a blow passage structure to the conventional dust collector, it is possible to permanently use the dust collector with improved performance through the flow path design Maintenance and repair costs can be reduced. In addition, since the plurality of filters are periodically exhausted and blown, the efficiency and reliability of the installation can be improved.

The present invention described above is not limited to the configuration and method of the above-described embodiments, the embodiments may be configured by selectively combining all or part of the embodiments so that various modifications can be made.

Claims

An inflow passage for mounting air at one end and guiding air including dust introduced into the hood;

A discharge passage having a suction fan to apply suction to the hood and to guide the sucked air to the outside;

A plurality of filter modules connected in parallel between the inflow passage and the discharge passage and controlled by a control unit for collecting, dedusting and blowing air;

Dust collecting facility dust emission reduction system characterized in that it comprises a blowing flow path is formed to return the air containing the fine dust introduced into the filter module by the dedusting process back to the filter module.
The method of claim 1,

In order to control the above processes each filter module,

A filter having a filter for filtering dust;

Compressed air injection unit for injecting compressed air into the filter inner space to release the dust adhered to the filter;

A discharge pipe valve branched from the discharge flow path and mounted to a discharge pipe connecting the filter to control discharge of filtered air in a filter internal space;

An inlet pipe valve branched from the inlet flow path and mounted to an inlet pipe connecting the filter to control intake of dust-containing air through a hood;

A blowing inlet pipe valve mounted to the blowing inlet pipe connecting the discharge pipe and the blowing flow path; And

A blower discharge pipe valve mounted to the blower discharge pipe connecting the inlet pipe and the blower flow path;

Dust collection equipment dust emission reduction system comprising a.
The method of claim 2,

The control unit,

A plurality of filter modules are controlled to perform a dust collecting process, wherein at least one filter module is controlled to perform a dust removal and blowing process.
The method of claim 3,

The control unit,

Controlling the dust collection process by opening the inlet and outlet pipe valves of the plurality of filter modules, closing the blower inlet pipe valves and the blower pipe valves, and sucking the filtered air through the plurality of filters through the suction fan,

Closing the inlet and outlet pipe valves of the at least one filter module, opening the blower inlet pipe valve and the blower pipe valve, and driving the blower to return the air inside the at least one filter module to control performance of the blowing process. Dust collecting system dust emission reduction system, characterized in that.
The method of claim 4, wherein

The control unit,

When the blowing process of the at least one filter module is completed, the blower inlet pipe valve and the blower discharge valve of the at least one filter module is closed, characterized in that it is formed to open the blower inlet valve and blower discharge valve valve of the other filter module. Dust collection system to reduce dust emissions.
In the dust collector dust emission reduction method comprising a plurality of filters connected in parallel,

A dust collecting process step of filtering dust by sucking air containing dust;

A dedusting process of spraying compressed air to the filter to remove dust adhering to the filter; And

And a blowing process step of returning the fine dust introduced into the filter inner space in the dust removal process to a filter.
The method of claim 6,

The dust collecting process step,

The inlet pipe and outlet pipe valves of the plurality of filters connected in parallel are opened, and the air containing the dust introduced along the inflow passage is split into the internal spaces of the plurality of filters through the inlet pipe and dust is removed by the filter. Dust collecting facility dust emission reduction method comprising the step of collecting air is discharged along the discharge passage through the discharge pipe.
The method of claim 7, wherein

The dust removal process step,

Dust collecting facility dust reduction method comprising the step of closing the inlet and outlet pipe valves of at least one filter of the dust collecting process step and the compressed air is injected into the filter inner space to dedust the dust layer attached to the filter outer surface. .
The method of claim 8,

The blowing process step,

The air inlet pipe valve and the air outlet pipe valve of the at least one filter in which the dust removal process step is completed are opened, and the blower is driven so that air including fine dust in the filter internal space introduced during the dust removal process step passes through the air filter passage. Dust collecting facility dust emission reduction method comprising the step of returning to.
The method of claim 9,

The dust extraction process step and the blowing step is dust collection equipment dust emission reduction method characterized in that it is made sequentially in a plurality of filters connected in parallel with a predetermined period.