Wet-type electric dust collection device for preventing fire, and operation method therefor

Abstract

The present invention relates to a wet-type electric dust collection device for preventing a fire, comprising: a dust-containing gas inlet; a charge housing including a charge inlet, in through which dust-containing gas flows, at one side surface thereof, a charge outlet, through which dust is discharged, at the other side surface thereof, and an ion generation part for ionizing the dust-containing gas that flows in through the charge inlet; a dust collection housing including a dust collection inlet, communicating with the charge outlet, at one side surface thereof, and a dust collection outlet, through which clean gas from which dust is removed is discharged, at the other side surface thereof; a device connection part provided at one end surface of the dust collection housing; a flow division part disposed between the device connection part and the dust collection housing so as to divide the dust collection housing from the device connection part; and a dust collection hopper disposed at the bottom of the dust collection housing to communicate therewith.

Description

Wet electrostatic precipitator for fire prevention and its operating method

[0001] The present invention relates to a wet type electrostatic precipitator, and more particularly, to a wet type electrostatic precipitator capable of preventing fire by insulating an electrode to which a high voltage is applied using an insulator, thereby blocking an electrical short that may occur during the process of washing and treating high-moisture exhaust gas, and blocking the spread of fire due to arc discharge through control of the applied power.

[0002] A wet electrostatic precipitator is a type of electrostatic precipitator. Its dust collection principle is the same as a dry electrostatic precipitator in that it charges dust in a dust gas using corona discharge and collects dust in the dust gas using a strong electric field. However, there is a difference in that when removing dust accumulated on the collecting electrode, it is washed with a cleaning solution rather than a physical impact such as wrapping.

[0003] In conventional wet electrostatic precipitator technology, a method is used to continuously wash the collecting plate by forming a water film on the surface of the collecting electrode to remove dust deposited on the collecting electrode, and to intermittently spray a cleaning solution using a spray or the like between the discharge electrode and the collecting electrode.

[0004] The formation of a film of cleaning solution on the surface of the collecting electrode has the advantage of not causing problems such as electrical short-circuits even if a film of cleaning solution is continuously formed on the surface of the collecting electrode during the operation of the electrostatic precipitator because the cleaning solution does not directly contact the discharge electrode, which is constantly subjected to high voltage, so the surface of the collecting electrode can be kept clean at all times. However, this method cannot remove dust attached to the discharge electrode, so an intermittent cleaning method using a spray is also used to clean the discharge electrode. When cleaning the discharge electrode using a spray, an electrical short-circuit may occur due to the cleaning solution droplets and water stream between the discharge electrode and the collecting electrode. To prevent this, the power applied to the discharge electrode is cut off before cleaning. This has the disadvantage that the electric field between the discharge electrode and the collecting electrode disappears during the cleaning of the discharge electrode using spray cleaning, making dust collection impossible.

[0005] When wet electrostatic precipitators are used to treat exhaust gases containing combustible substances such as oil vapor, spark discharges and arc discharges within the precipitator can cause fires. Textile dyeing plants, where exhaust gases contain large amounts of combustible substances such as oil vapor and fiber dust, are a representative high-fire risk industry. According to a report by the Korea Fire Insurance Association, in 2014, an average of two fires occurred per month in the Daegu Dyeing Industrial Complex due to ignition of flammable oil-based dust in the precipitator.

[0006] In conventional wet electrostatic precipitators, dust-laden gas containing oil vapor and moisture flows between the discharge electrodes and the dust collector electrodes, which are spaced apart and facing each other at regular intervals, thus increasing the risk of sparks. Furthermore, since power is continuously supplied to the discharge electrodes, an arc can be generated due to overcurrent if a spark occurs. The sparks generated by the arc can spread to combustible materials accumulated in the hopper, etc., potentially causing a fire.

[0007] Therefore, in order to stably treat exhaust gas containing flammable substances such as oil vapor using a wet electrostatic precipitator; (1) selectively remove substances that can cause spark discharge, such as relatively large water droplets, and combustible substances that can spread fire, from the front of the space where electrostatic precipitation is performed, (2) prevent sparks from occurring even when over-humidification conditions are formed between the discharge electrode and the dust collector electrode, such as by spraying a cleaning solution onto the discharge electrode to which high voltage is applied, and (3) develop a technology to block the flow of overcurrent caused by spark generation, thereby blocking the spread of fire caused by arc discharge.

[0008] The purpose of the present invention is to provide a wet type electric dust collector capable of preventing fire by preventing sparks from occurring even in a situation where the dust gas is excessively humid and contains flammable / inflammable dust, and by allowing for periodic cleaning of the discharge electrode and dust collecting electrode, thereby stably maintaining dust collection.

[0009] The purpose of the present invention is to provide a wet electric precipitator that can block the spread of fire caused by arc discharge by maintaining a high-intensity electric field between a discharge electrode and a dust collecting electrode even when power is cut off and blocking the flow of overcurrent when a spark occurs.

[0010] According to one embodiment of the present invention, a wet type electric dust collector includes a dust gas inlet through which dust gas flows in, a charging housing having a space therein and including a charging inlet through which dust gas flows in on one side, a charging outlet through which electrically charged dust is discharged on the other side, and an ion generator for ionizing the dust gas flowing in through the charging inlet, a dust collecting housing having a space therein and including a dust collecting inlet communicated with the charging outlet on one side, and a dust collecting outlet through which clean gas from which dust has been removed is discharged on the other side, a device connection part provided on one side of the dust collecting housing, a flow partition part arranged between the device connection part and the dust collecting housing to divide the dust collecting housing and the device connection part, and a dust collecting hopper arranged in communication with the lower part of the dust collecting housing, wherein the dust collecting housing includes a plurality of power supply parts including high voltage electrodes made of a conductive material and having a dielectric layer formed on the surface, a plurality of dust collecting electrodes made of a conductive material and being electrically grounded, a plurality of A cleaning device comprising: a plurality of spray nozzles arranged between dust collectors to spray a cleaning solution; a control unit for controlling the flow of the cleaning solution into the plurality of spray nozzles; and a first direct current power supply unit for applying high voltage to the plurality of power supply units. The plurality of power supply units and the plurality of dust collectors are arranged to be spaced apart from each other at regular intervals and alternately arranged, and the cleaning device may be characterized in that, even when the cleaning solution is sprayed from the plurality of spray nozzles while the high voltage is applied to the plurality of power supply units by the first direct current power supply unit, no electrical short circuit occurs between the plurality of power supply units and the plurality of dust collectors.

[0011] According to another embodiment of the present invention, a wet type electric dust collector comprises: a dust gas inlet through which dust gas flows in; a charging housing having a space therein and having a charging inlet through which dust gas flows in on one side; a charging outlet through which electrically charged dust is discharged on the other side; and an ion generator for ionizing the dust gas flowing into the charging inlet; a dust collecting housing having a space therein and having a dust collecting inlet communicated with the charging outlet on one side; and a dust collecting outlet through which clean gas from which dust has been removed is discharged on the other side; a charging duct communicating the dust collecting outlet with the charging inlet; a charging pump disposed in the charging duct and sucking a portion of the clean gas discharged from the dust collecting outlet and discharging it to the charging inlet; a device connection portion disposed on one side of the dust collecting housing; a flow partition portion disposed between the device connection portion and the dust collecting housing and dividing the dust collecting housing and the device connection portion, respectively; A dust collecting housing includes a dust collecting hopper that is connected to and arranged at the bottom thereof, and the dust collecting housing includes a plurality of power supply units including a high-voltage electrode made of a conductive material and having a dielectric layer formed on the surface, a plurality of dust collecting electrodes made of a conductive material and electrically grounded, a plurality of spray nozzles arranged between the plurality of dust collecting electrodes for spraying a cleaning liquid, a control unit that controls the inflow of the cleaning liquid into the plurality of spray nozzles, and a first DC power supply unit that applies a high voltage to the plurality of power supply units, wherein the plurality of power supply units and the plurality of dust collecting electrodes are arranged to be spaced apart from each other at a predetermined interval and alternately arranged, and even when the cleaning liquid is sprayed from the plurality of spray nozzles in a state where the high voltage is applied to the plurality of power supply units by the first DC power supply unit, no electrical short circuit occurs between the plurality of power supply units and the plurality of dust collecting electrodes.

[0012] In one embodiment, the charging housing may further include a second direct current power supply unit that supplies power to the ion generator unit.

[0013] In one embodiment, a pre-treatment dust collector may be further included, which is disposed between the dust gas inlet and the charging housing.

[0014] In one embodiment, by spraying a cleaning solution through a plurality of spray nozzles while power is applied from a first direct current power source, the dielectric is polarized, and dust in the dust gas can be captured by an electric field generated due to the polarization of the dielectric.

[0015] In one embodiment, at least one of a first heat exchanger for changing the temperature of the exhaust gas between the exhaust gas inlet and the pre-treatment dust collector or a second heat exchanger for changing the temperature of the exhaust gas between the pre-treatment dust collector and the charging housing may be further included.

[0016] In one embodiment, a third heat exchanger for changing the temperature of the exhaust gas may be further included between the charging discharge port of the charging housing and the dust collection inlet port of the dust collection housing.

[0017] In one embodiment, a fluidized bed may be included between the charging discharge port of the charging housing and the dust collection inlet port of the dust collection housing.

[0018] According to another embodiment of the present invention, a wet type electrostatic precipitator comprises a charging housing including a dust gas inlet through which dust gas flows in, a charging inlet having a space therein and through which dust gas flows in on one side thereof, a charging outlet through which electrically charged dust is discharged on the other side thereof, and an ion generator for ionizing the dust gas flowing in through the charging inlet, a plurality of dust collecting modules including the charging housing, each of the plurality of dust collecting modules including a dust inlet having a space therein and through which dust gas flows in on one side thereof and is connected to the charging outlet, a dust collecting outlet through which dust-removed gas is discharged on the other side thereof, a plurality of power supply units including high voltage electrodes made of a conductive material and having a dielectric layer formed on the surface thereof, a plurality of dust collecting electrodes made of a conductive material and electrically grounded, a dust collecting housing including a plurality of spray nozzles disposed between the plurality of dust collecting electrodes and spraying a cleaning liquid, a device connection unit provided on one side of the dust collecting housing, and disposed between the device connection unit and the dust collecting housing. It includes a fluid compartment that divides a dust collecting housing and a device connection section, and a dust collecting hopper that is arranged in communication with the lower part of the dust collecting housing, and may include one or more control sections that individually control a plurality of spray nozzles or a plurality of power supply sections included in a plurality of dust collecting modules, and one or more direct current power supply sections that apply high voltage to the plurality of power supply sections.

[0019] According to another embodiment of the present invention, a wet type electrostatic precipitator comprises a charging housing including a dust gas inlet through which dust gas flows in, a charging inlet having a space therein and through which dust gas flows in on one side thereof, a charging outlet through which electrically charged dust is discharged on the other side thereof, and an ion generator for ionizing the dust gas flowing in through the charging inlet, a plurality of dust collecting modules communicating with the charging housing, each of the plurality of dust collecting modules including a dust inlet having a space therein and through which dust gas flows in on one side thereof, a dust collecting outlet through which dust-removed gas is discharged on the other side thereof, a plurality of power supply units including high voltage electrodes made of a conductive material and having a dielectric layer formed on the surface thereof, a plurality of dust collecting electrodes made of a conductive material and electrically grounded, and a dust collecting housing including a plurality of spray nozzles disposed between the plurality of dust collecting electrodes for spraying a cleaning liquid, a device connection portion provided on one side of the dust collecting housing, and disposed between the device connection portion and the dust collecting housing. It includes a fluid compartment that divides a dust collecting housing and a device connection section, and a dust collecting hopper that is arranged in communication with the lower part of the dust collecting housing, and may include one or more control sections that individually control a plurality of spray nozzles or a plurality of power supply sections included in a plurality of dust collecting modules, and one or more direct current power supply sections that apply high voltage to the plurality of power supply sections.

[0020] In one embodiment, a plurality of dust collection modules are configured to be connected in series or parallel, and when a plurality of dust collection modules are connected in parallel, each of the plurality of dust collection modules may include a flow opening / closing unit that opens / closes the flow of the fluid.

[0021] In one embodiment, the device may further include a charging duct that connects the dust collection outlet and the charging inlet, and a charging pump that is disposed within the charging duct and sucks in a portion of the clean gas discharged from the dust collection outlet and discharges it to the charging inlet.

[0022] According to another embodiment of the present invention, a wet electrostatic precipitation method using a wet electrostatic precipitator may include a step of applying voltage to a power supply unit by a control unit and spraying a cleaning liquid from a plurality of spray nozzles by the control unit, a step of polarizing the dielectric by allowing the cleaning liquid to flow on a dielectric surface, a step of cutting off power supply to the power supply unit by the control unit and cutting off spraying of the cleaning liquid from the plurality of spray nozzles by the control unit, a step of collecting dust in a dust-containing gas by passing between the plurality of power supply units and the plurality of dust collecting electrodes and collecting dust by an electric field formed between the plurality of power supply units and the plurality of dust collecting electrodes due to the polarization of the dielectric, a step of repeating the spraying step, the polarizing step, the spraying blocking step, and the dust collecting step at a predetermined cycle.

[0023] According to another embodiment of the present invention, a wet electrostatic precipitation method using a wet electrostatic precipitator including a plurality of dust collecting modules may include a step of applying voltage to a plurality of power supply units by a control unit and spraying a cleaning solution from a plurality of spray nozzles by the control unit, a step of polarizing the dielectric by allowing the cleaning solution to flow on the dielectric surface, a step of cutting off power supply to the plurality of power supply units by the control unit and cutting off spraying of the cleaning solution from the plurality of spray nozzles by the control unit, a step of collecting dust in a dust-containing gas by passing between the plurality of power supply units and the plurality of dust collecting electrodes and collecting dust by an electric field formed between the plurality of power supply units and the plurality of dust collecting electrodes due to the polarization of the dielectric, a step of repeatedly performing the spraying step, the polarizing step, the spraying blocking step, and the dust collecting step alternately for the plurality of dust collecting modules.

[0024] According to another embodiment of the present invention, a wet electrostatic precipitation method using a wet electrostatic precipitator including a plurality of dust collecting modules comprises the steps of: blocking the flow of dusty gas flowing into the plurality of dust collecting modules by a flow switching unit; applying voltage to a plurality of power supply units by a control unit, and spraying a cleaning liquid from a plurality of spray nozzles by the control unit; allowing the cleaning liquid to flow on a dielectric surface to polarize the dielectric; cutting off the power supply to the plurality of power supply units by the control unit, and cutting off the spraying of the cleaning liquid from the plurality of spray nozzles by the control unit; forming a flow of dusty gas flowing into the dust collecting module by the flow switching unit; collecting dust in the dusty gas by passing between the plurality of power supply units and the plurality of dust collecting electrodes by an electric field formed between the plurality of power supply units and the plurality of dust collecting electrodes due to the polarization of the dielectric; spraying, polarizing, blocking the spraying, forming the flow, and collecting the dust; the steps of alternatingly repeating for each dust collecting module. It may include steps.

[0025] According to the present invention, sparks do not occur even in situations where the dust gas is excessively humid and contains flammable / inflammable dust, and the discharge electrode and dust collection electrode can be cleaned periodically, thereby enabling stable dust collection and fire prevention.

[0026] According to the present invention, a high-intensity electric field is maintained between a discharge electrode and a dust collecting electrode even when power is cut off, and an overcurrent flow is blocked when a spark occurs, thereby having the effect of blocking the spread of fire due to arc discharge.

[0027] FIG. 1(a) is a drawing showing a wet electrostatic precipitator according to one embodiment of the present invention.

[0028] Fig. 1(b) is a drawing showing a wet electrostatic precipitator according to another embodiment of the present invention.

[0029] FIG. 1(c) is a drawing showing a wet electrostatic precipitator according to another embodiment of the present invention.

[0030] FIG. 2(a) to FIG. 2(c) are drawings showing a charging housing (120) according to one embodiment of the present invention.

[0031] FIG. 3(a) is a drawing showing a dust collecting housing including a rod-shaped power supply unit according to one embodiment of the present invention.

[0032] FIG. 3(b) is a drawing showing a dust collecting housing including a plate-shaped power supply unit according to another embodiment of the present invention.

[0033] FIG. 4 is a drawing showing the operation of a dust collecting housing according to one embodiment of the present invention.

[0034] Figure 5 is a graph showing the results of a dust collection performance experiment according to the present invention.

[0035] Figure 6 is a flowchart showing a control method using a single dust collection module in one embodiment of the present invention.

[0036] FIGS. 7(a) and 7(b) are drawings showing a wet electrostatic precipitator including a plurality of dust collecting modules connected in series according to one embodiment of the present invention.

[0037] Figure 8 is a flowchart showing a control method for multiple dust collection modules connected in series.

[0038] FIGS. 9(a), 9(b), and 9(c) are drawings showing a wet electrostatic precipitator including a plurality of parallel-connected dust collecting modules according to another embodiment of the present invention.

[0039] Figure 10 is a flowchart showing a control method for multiple dust collection modules connected in parallel.

[0040] Figure 11 is a graph showing the amount of dust emitted according to the spray conditions.

[0041] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components will be given identical or similar drawing reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used in the following description for components are given or used interchangeably only for the convenience of writing the specification, and do not in themselves have distinct meanings or roles. In addition, when describing the embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, a detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0042] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0043] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0044] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0045] In the present invention, it should be understood that terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0046] In the present invention, the device, all or part of the device, or all or part of the functional blocks of the block diagram may be controlled by one or more electronic circuits or computing devices including a semiconductor device, a semiconductor integrated circuit (IC), or an LSI (large scale integration). The LSI or IC may be integrated into a single chip or may be configured by combining multiple chips. For example, functional blocks other than memory elements may be integrated into a single chip. Although referred to herein as an LSI or IC, the nomenclature may change depending on the degree of integration, and may be referred to as a system LSI, a VLSI (very large scale integration), or an ULSI (ultra large scale integration).

[0047] Additionally, all or part of the functions or operations of a unit, device, or part of a device may be executed by software processing. In this case, the software is recorded on one or more non-transitory storage media such as a ROM, an optical disk, a hard disk drive, etc., and when the software is executed by a processing device (processor), the software causes the processing device (processor) and peripheral devices to execute specific functions within the software. A system or device may include one or more non-transitory storage media on which software is recorded, a processing device (processor), and necessary hardware devices, such as an interface.

[0048] Hereinafter, with reference to the attached drawings, a preferred embodiment of the present invention will be described in more detail.

[0049] Fig. 1(a) is a drawing showing a wet electric precipitator (100a) according to one embodiment of the present invention.

[0050] Referring to FIG. 1(a), the wet type electric dust collector (100a) of the present invention comprises a dust gas inlet (110) through which dust gas flows in, a charging housing (120) having a space inside and including a charging inlet (121) through which dust gas flows in on one side and a charging outlet (122) through which electrically charged dust is discharged on the other side, a dust collecting housing (130) having a space inside and including a dust collecting inlet (131) connected to the charging outlet (122) on one side and a dust collecting outlet (132) through which clean gas from which dust has been removed is discharged on the other side, a dust collecting hopper (140) connected to and arranged at the lower part of the dust collecting housing (130), a device connection part (150) provided on one side of the dust collecting housing (130), and a device connection part (150) arranged between the device connection part (150) and the dust collecting housing (130). It may include a flow partition (160) that divides the dust collection housing (130) and the device connection part (150), and one or more spray nozzles (161) installed in the flow partition (160) so that the cleaning liquid can be sprayed toward the space where the dust gas flows.

[0051] Specifically, the dust gas is introduced into the wet electrostatic precipitator (100a) through the dust gas inlet (110), and the dust gas inlet (110) can be directly or indirectly connected to the charging inlet (121) located in the charging housing (120). The connection method can vary depending on the usage environment or design requirements, and for example, it can be connected to the charging inlet (121) through a duct, or can be connected by including an additional pretreatment device and / or a heat exchanger. This connection structure allows the dust gas to be introduced efficiently into the device, thereby improving the overall dust collection efficiency.

[0052] Within the charging housing (120), the dust gas introduced through the charging inlet (121) undergoes an ionization process. This ionization process imparts an electric charge to dust particles, thereby enhancing the dust removal efficiency during the subsequent dust collection process. The ionization process will be described in detail in FIGS. 2(a) to 2(c) .

[0053] The interior of the dust collecting housing (130) is spatially structured, and on one side there is a dust collecting inlet (131) that is connected to a charging discharge port (122), and on the other side there is a dust collecting outlet (132) through which clean gas after dust has been removed is discharged. In addition, on the other side of the dust collecting housing (130), a device connection part (150) is positioned, and the device connection part (150) is designed to prevent the inflow of dusty gas through a partition wall. The device connection part (150) can be separated from the dust collecting housing (130) through a flow partition part (160).

[0054] The flow compartment (160) is located between the device connection portion (150) and the dust collection housing (130), and one or more spray nozzles (161) can spray a cleaning liquid into the dust gas flow path. This cleaning liquid is used to clean the interior of the dust collection housing (130), and this process will be described in detail in FIG. 3 below.

[0055] The dust collection hopper (140) may be installed on one side or the bottom of the dust collection housing (130). The dust collection hopper (140) is typically made of a durable, corrosion-resistant material suitable for the type of dust to be collected. Common materials include stainless steel, carbon steel with a protective coating, or special alloys for handling corrosive or high-temperature dust. The shape of the dust collection hopper (140) is usually conical or pyramidal, tapering towards the bottom, allowing the collected dust to easily flow by gravity towards a discharge point.

[0056] In the wet electric precipitator (100a) according to the embodiment of Fig. 1(a), dust in the dust gas introduced through the dust gas inlet (110) is electrically charged as it passes through the charging housing (120), and the charged dust is captured as it passes through the dust collecting housing (130), so that clean gas with the dust removed can be exhausted. The dust captured in the dust collecting housing can be cleaned by the spray nozzle (161) and deposited in the dust collecting hopper (140).

[0057] Fig. 1(b) is a drawing showing a wet electrostatic precipitator (100b) according to another embodiment of the present invention.

[0058] Referring to Fig. 1(b), a wet type electric dust collector (100b) includes a dust gas inlet (110) through which dust gas flows in, a charging housing (120) having a space inside and including a charging inlet (121) through which dust gas flows in on one side and a charging outlet (122) through which electrically charged dust is discharged on the other side, a dust collecting housing (130) having a space inside and including a dust collecting inlet (131) connected to the charging outlet (122) on one side and a dust collecting outlet (132) through which clean gas from which dust has been removed is discharged on the other side, a dust collecting hopper (140) connected to and arranged at the bottom of the dust collecting housing (130), a device connection part (150) provided on one side of the dust collecting housing (130), and a device connection part (150) arranged between the device connection part (150) and the dust collecting housing (130). It includes a flow partition (160) that divides a dust collection housing (130) and a device connection part (150), and one or more spray nozzles (161) installed in the flow partition (160) so that a cleaning liquid can be sprayed toward a space where dust gas flows, and further includes a pretreatment dust collection device (180), a first heat exchange part (191), and a second heat exchange part (192) between the dust gas inlet (110) and the charging housing (120), and may further include a fluid stirring part (183), a motor (184), and a third heat exchange part (193) between the charging housing (120) and the dust collection housing (130). Additionally, it may further include a pretreatment hopper (181) connected to a pretreatment dust collector (180), a dust measurement unit (182) for measuring dust accumulated in the pretreatment hopper (181), a pretreatment duct (171) connecting the dust collector hopper (140) and the pretreatment hopper (181), an opening / closing device (172) for opening / closing the pretreatment duct (171), and an opening / closing control unit (173) for controlling the opening / closing device (172).

[0059] The dust gas inlet (110), charging housing (120), dust collecting housing (130), device connection part (150), and flow compartment (160) illustrated in Fig. 1(b) correspond to the configuration described in Fig. 1(a), so a detailed description of these configurations will be omitted below, and the description will focus on the configuration added in Fig. 1(b).

[0060] As illustrated in Fig. 1(b), the pre-treatment dust collector (180) may be placed upstream of the charging inlet (121) in the direction of flow of the exhaust gas. The pre-treatment dust collector (180) may be a dust collector of a dust collection method other than an electric dust collector, for example, an inertial dust collector such as a cyclone, or a filtration dust collector such as a filter or a demister. When the pre-treatment dust collector (180) is installed, relatively large droplets or combustible substances that may flow into the charging housing (120) and the dust collecting housing (130) together with the dust-containing gas can be collected in advance. As a result, the occurrence of spark discharge due to the flow of droplets into the charging housing (120) and the dust collecting housing (130) can be suppressed. In addition, by isolating combustible materials that can be transferred to sparks from areas with a high possibility of spark generation, such as the dust collecting housing (130) or the charging housing (120), it is possible to prevent fire from spreading even if sparks occur in the charging housing (120) or the dust collecting housing (130).

[0061] In order to process the liquid droplets and combustible substances accumulated in the pretreatment dust collector (180), the pretreatment dust collector (180) may further include a separate pretreatment hopper (181). The pretreatment hopper (181) may be installed in communication with the dust collector hopper (140) of the dust collector housing (130). In addition, an opening / closing device (172) capable of opening / closing the connection part and an opening / closing control unit (173) capable of controlling the same may be installed in any part of the connecting passage (hereinafter, “pretreatment duct (171)”) between the pretreatment hopper (181) and the dust collector hopper (140) of the dust collector housing (130). A dust accumulation measurement unit (182) capable of measuring the amount of dust accumulated in the pretreatment hopper (181) may further be installed on one side of the pretreatment hopper (181). Typically, an electric precipitator has a blower installed at the rear end to form a flow, and due to the suction power of the blower, the static pressure inside the pretreatment precipitator (180) becomes lower than the static pressure inside the dust collecting housing (130). Therefore, if the pretreatment hopper (181) and the dust collecting hopper (140) of the dust collecting housing (130) are connected and installed, the liquid droplets and combustible materials deposited in the pretreatment hopper (181) can be transferred to the dust collecting hopper (140) without a separate driving unit, thereby facilitating the treatment of the sediment. At this time, if sufficient sediment is not deposited in the pretreatment hopper (140), a bypass flow may occur from the pretreatment hopper (181) to the dust collection hopper (140). This can be resolved by installing an opening / closing device (172) and an opening / closing control unit (173) to open the pretreatment duct (171) only when the sediment in the pretreatment hopper (181) is to be transferred to the dust collection hopper (140). In addition, by installing a sediment dust measurement unit (182) in the pretreatment hopper (181) and operating it in conjunction with the opening / closing control unit (173), the sediment treatment in the pretreatment hopper (181) can be made easier.

[0062] However, since the pretreatment hopper (181) is an optional component of the pretreatment dust collector (180), it can be omitted, and if the pretreatment hopper (181) is not provided, the pretreatment dust collector (180) and the dust collector hopper (140) can be directly connected through the pretreatment duct (171).

[0063] A heat exchanger may be installed upstream of the dust collection inlet (131) in the direction of exhaust gas flow. The heat exchanger may be connected to an exhaust gas line flowing into the wet electrostatic precipitator (100b) or an external heat source, etc., to change the temperature of the dust-containing gas flowing into the wet electrostatic precipitator (100b).

[0064] For example, if a heat exchange unit (first heat exchange unit) (191) is installed upstream of a pretreatment dust collector (180) to lower the temperature of the dust gas, moisture and gaseous pollutants in the dust gas can be condensed, allowing more pollutants in the dust gas to be captured through the pretreatment dust collector (180). If a heat exchange unit (second heat exchange unit) (192) is installed between the pretreatment dust collector (180) and the charging housing (120) to increase the temperature of the dust gas, fine droplets that were not processed in the pretreatment dust collector (180) can be vaporized, thereby suppressing the occurrence of sparks and arc discharges due to droplets entering the charging housing (120) or the dust collecting housing (130). When a heat exchanger (third heat exchanger) (193) is installed between the charging housing (120) and the dust collecting housing (130) to lower the temperature of the dust gas, moisture and gaseous pollutants in the dust gas can be condensed and captured inside the dust collecting housing (130), thereby reducing the amount of white smoke and gaseous pollutants emitted from the rear end of the wet electric precipitator (100b).

[0065] A fluidized bed stirring unit (183) may be installed downstream of the charging housing (120) in the direction of the exhaust gas flow. The fluidized bed stirring unit (183) may have a propeller shape including a rotating mechanism such as a motor (184) or a shape in which a plurality of baffles are arranged in an alternating manner. When the fluidized bed stirring unit (183) is installed at the rear end of the charging housing (120), the contact time between the electrons (or ions) generated by the corona discharge in the charging housing (120) and the dust in the exhaust gas is increased, thereby increasing the charging amount of the dust, and thereby increasing the dust collection efficiency in the dust collecting housing (130).

[0066] The charging housing (120) and the dust collecting housing (130) can be arranged close to each other, but preferably, they are arranged so that the flow directions of the charging discharge port (122) and the dust collecting inlet port (131) are not parallel, and a fluid stirring part (183) and a third heat exchange part (193) are arranged between the charging housing (120) and the dust collecting housing (130), so that the charging housing (120) and the dust collecting housing (130) are spaced apart from each other by a certain distance.

[0067] When the flow directions of the charging housing (120) and the dust collecting housing (130) are not parallel or are spaced apart from each other by a certain distance, it is possible to suppress the occurrence of spark discharge due to the inflow of cleaning liquid into the charging housing (120) that may occur during the process of cleaning the inside of the dust collecting housing (130) using the spray nozzle (161).

[0068] FIG. 1(c) is a drawing showing a wet electrostatic precipitator (100c) according to another embodiment of the present invention.

[0069] As shown in Fig. 1(c), a wet electric dust collector (100c) according to another embodiment of the present invention comprises: a dust gas inlet (110) into which dust gas flows in; a charging housing (120) having a space therein, the charging housing including a charging inlet (121) into which dust gas flows in on one side, and a charging outlet (122) through which electrically charged dust is discharged on the other side; a dust collecting housing (130) having a space therein, the dust collecting inlet (131) communicating with the charging outlet (122) on one side, and a dust collecting outlet (132) through which clean gas from which dust has been removed is discharged on the other side; a charging duct (201) connecting the dust collecting outlet (132) and the charging inlet (121); and a part of the clean gas discharged from the dust collecting outlet (132) is sucked in by being disposed in the charging duct (201). It may include a charging pump (202) that discharges to a charging inlet (121), a device connection part (150) arranged on one side of a dust collecting housing (130), a flow partition part (160) arranged between the device connection part (150) and the dust collecting housing (130) to divide the dust collecting housing (130) and the device connection part (150), one or more spray nozzles (161) installed in the flow partition part (160) so that a cleaning liquid can be sprayed toward a space where a dust-containing gas flows, and a dust collecting hopper (140) that is arranged in communication with the lower part of the dust collecting housing (130).

[0070] Dust in the dust gas that flows into the wet electrostatic precipitator (100c) through the dust gas inlet (110) is electrically charged by electrons (or ions) that flow upstream of the dust collection inlet (131) from the charging outlet (122), and the charged dust can be collected while passing through the dust collection housing (130). The clean gas from which the dust has been removed is exhausted through the dust collection outlet (132), and some of the clean gas can be introduced into the charging housing (120) by the charging pump (202), be ionized, and flow upstream of the dust collection inlet (131) through the charging outlet (122). The dust collected in the dust collection housing (120) can be cleaned by the spray nozzle (161) and deposited in the dust collection hopper (140).

[0071] The wet type electrostatic precipitator (100c) illustrated in Fig. 1(c) may have a pretreatment dust collector (180) installed upstream of the intersection of the charging outlet (122) and the dust collection inlet (131) in the direction of exhaust gas flow. The pretreatment dust collector (180) according to Fig. 1(c) may further have a pretreatment hopper (181), a pretreatment duct (171), an opening / closing device (172), an opening / closing control unit (173), and a sedimentation dust measurement unit (182), through which the functions of the wet type electrostatic precipitator (100b) according to Fig. 1(b) described above can be implemented in the same manner.

[0072] A heat exchanger may be installed upstream of the dust collection inlet (131) in the direction of exhaust gas flow. The heat exchanger may be connected to the exhaust gas line flowing into the wet electrostatic precipitator (100c) or an external heat source, etc., to change the temperature of the dust-containing gas flowing into the wet electrostatic precipitator (100c). When a heat exchanger (first heat exchanger) (191) is installed upstream of the pretreatment dust collector (180) to lower the temperature of the dust-containing gas, moisture and gaseous pollutants in the dust-containing gas may be condensed, allowing the pretreatment dust collector (180) to capture more pollutants in the dust-containing gas. When a heat exchanger is installed upstream (second heat exchanger) (192) or downstream (third heat exchanger) (193) of the intersection of the discharge port (122) and the dust inlet (131) downstream of the pretreatment dust collector (180) to lower the temperature of the dust-containing gas, moisture and gaseous pollutants in the dust-containing gas can be condensed and captured inside the dust collecting housing (130), thereby reducing the amount of white smoke and gaseous pollutants emitted from the rear end of the wet electric dust collector (100c). A fluidized bed agitator (183) can be installed upstream of the dust inlet (131) in the direction of the flue gas flow, and the operation method, structure, and function of the fluidized bed agitator (183) are the same as those of the fluidized bed agitator (183) in FIG. 1(b) described above.

[0073] FIG. 2(a) to FIG. 2(c) are drawings showing a charging housing (120) according to one embodiment of the present invention.

[0074] As illustrated in FIGS. 2(a) to 2(c), the charging housing (120) may include an ion generator (210). The ion generator (210) functions to ionize gas within the charging housing (120), and technically, a method of forming an unequal electric field using high voltage, a method using a flame, a method using a light source such as a UV lamp, etc. may be used. In the method of forming an unequal electric field using high voltage, the ion generator (210) may be composed of a discharge electrode (211), an ion generator housing (212), and a DC power supply (213) that applies a high voltage to the discharge electrode (211) (FIG. 2(a)). The discharge electrode (211) may have a shape capable of forming an unequal electric field, such as a pin or wire with multiple peaks, and a part or all of the ion generating housing (212) may be made of an insulator for electrical insulation between the discharge electrode (211) and the inner wall of the grounded charging housing (120).

[0075] The charging housing (120) of FIGS. 2(a) to 2(c) may correspond to the charging housing (120) illustrated in FIGS. 1(a) and 1(b). The charging housing (120) illustrated in FIGS. 1(a) and 1(b) is located upstream of the dust collecting housing (130), and dust contained in the dust gas may be electrically charged as it passes through the charging housing (120).

[0076] The charging housing (120) illustrated in Fig. 1(c) can be placed within the charging duct (201) or combined with the charging duct (201), and generates electrons (or ions) using the clean gas passing through the dust collecting housing (130), and injects the generated electrons (or ions) into the dust collecting duct (174) connected to the dust collecting housing (130) to electrically charge dust contained in the dust gas.

[0077] This configuration can further suppress the occurrence of fire due to sparks within the charging housing (120) by preventing the discharge electrode (211) to which high voltage is applied from being directly exposed to a gas containing flammable substances and droplets.

[0078] Referring to FIG. 2(b), the ion generator (210) according to one embodiment of the present invention may further include a perforated ground electrode (214) that is spaced apart from the discharge electrode (211) by a certain distance in the direction of the flow of the dust gas and has a potential difference with the discharge electrode (211). The perforated ground electrode (214) may have one or more perforations formed therein to allow the dust gas to flow into the discharge electrode (211).

[0079] Referring to Fig. 2(c), the ion generator (120) has a potential difference with the discharge electrode (211) and may further include a ground electrode (215) that is arranged alternately with the plurality of discharge electrodes (211) at a certain interval.

[0080] As shown in Fig. 2(a), when a conductive structure having a potential difference with respect to the discharge electrode (211), such as a perforated ground electrode (214) or a ground electrode (215), is not installed around the discharge electrode (211) of the ion generator (210), the gas ions (or electrons) generated around the discharge electrode (211) move together with the dust according to the flow of gas and can charge the dust by diffusion (diffusion charging), and as shown in Figs. 2(b) to 2(c), when a conductive structure having a potential difference with respect to the discharge electrode (211), such as a perforated ground electrode (214) or a ground electrode (215), is installed around the discharge electrode (211) of the ion generator (210), the gas ions (or electrons) generated around the discharge electrode (211) can move between the discharge electrode (211) and the perforated ground electrode (214) (in the case of Fig. 2(b)) or between the discharge electrode (211) and the perforated ground electrode (214). The dust can be charged by moving to the perforated ground electrode (214) or the ground electrode (215) by the electric field generated between the ground electrodes (215) (in the case of Fig. 2(c)) (field charging).

[0081] FIG. 3(a) is a drawing showing a dust collecting housing (130) including a rod-shaped power supply unit (310a) according to one embodiment of the present invention, and FIG. 3(b) is a drawing showing a dust collecting housing (130) including a plate-shaped power supply unit (310b) according to another embodiment of the present invention.

[0082] Referring to FIG. 3(a) and FIG. 3(b), a plurality of power supply units (310a, 310b) and dust collectors (320) may be installed inside the dust collection housing (130). The power supply units (310a, 310b) may be formed of a high-voltage electrode (330) made of a conductive material and a dielectric (340) which is an insulating material covering the surface of the high-voltage electrode (330). As an example, a Teflon coating may be used for the dielectric (340), or a tube made of an insulating material such as a Teflon tube or a silicone tube, or an insulating sheet, etc. may be used. In general, the thickness of the Teflon coating may vary from several micrometers (μm) to several hundred micrometers. The thickness of the Teflon coating may be determined depending on the size of the applied voltage, the required insulation performance, etc.

[0083] In FIG. 3(a) and FIG. 3(b), the power supply unit (310a, 310b) is exemplified as a cylinder shape and a plate shape, but it can have various other shapes depending on the design. That is, a polygonal rod or plate, for example, a square rod or a pentagonal plate, can also be used as the power supply unit (310a, 310b), and the shape of the power supply unit (310a) can be determined by the environment in which the dust collector is installed, the processing flow rate of the dust collector, etc.

[0084] The dust collector (320) may be made of a conductive material, and a high voltage may be applied to the high voltage collector (330) and the dust collector (320) may be electrically grounded. The power supply unit (310a, 310b) and the dust collector (320) may be installed at a certain distance from each other.

[0085] The high voltage applied to the high voltage electrode (330) may be applied using the DC power supply (213) of the ion generator (210), or a separate DC power supply may be additionally provided. The strength and polarity of the high voltage applied to the high voltage electrode (330) may be the same as the voltage applied to the ion generator (210).

[0086] When a high voltage is applied to the high voltage electrode (330), an electric field is formed between the high voltage electrode (330) and the dust collecting electrode (320), and the charged dust may be attached to the surface of the high voltage electrode (330) or the dust collecting electrode (320) through the charging housing. At this time, when the polarity of the voltage applied to the ion generating unit (210) and the voltage applied to the high voltage electrode (330) are the same, the dust is mainly attached to the surface of the dust collecting electrode (320), so that contamination of the power supply unit (310a, 310b) due to the attachment of the charged dust to the surface of the power supply unit (310a, 310b) can be minimized.

[0087] When dust is sufficiently attached to the surface of the power supply unit (310a, 310b) and the surface of the dust collector (320), cleaning can be performed by spraying a cleaning solution between the power supply unit (310a, 310b) and the dust collector (320) using a spray nozzle (161). At this time, since the surface of the power supply unit (310a, 310b) to which high voltage is applied is surrounded by a dielectric, spark discharge due to the spraying of the cleaning solution does not occur even if the high voltage applied to the high-voltage electrode (330) is not cut off. This can reduce the risk of fire due to spark discharge.

[0088] In addition, since the high voltage applied to the high-voltage electrode (330) during cleaning is not blocked, the electric field between the power supply unit (310a, 310b) and the dust collection electrode (320) can be maintained even during cleaning, thereby maintaining dust collection efficiency even during cleaning. In addition, since water washing is possible at any time, the surfaces of the power supply unit (310a, 310b) and the dust collection electrode (320) can be kept clean at all times.

[0089] FIG. 4 is a drawing showing the operation of a dust collecting housing according to one embodiment of the present invention.

[0090] As illustrated in FIG. 4, if a separate first DC power supply unit (410) is connected to the high voltage electrode (330), and a control unit (420) capable of turning ON / OFF the power applied from the first DC power supply unit (410) to the high voltage electrode (330) and controlling the spray nozzle (161) is provided, the dust collection performance can be maintained even when the high voltage application to the high voltage electrode (330) is cut off by using an electro-wetting phenomenon. The control unit (420) can control to turn ON / OFF the power applied from an external power source to the first DC power supply unit (410) by using a switch or the like, or can control to turn ON / OFF the electrical connection between the first DC power supply unit (410) and the high voltage electrode (330).

[0091] Electrowetting is a phenomenon in which, when power is applied to a conductor in a system consisting of a 'grounded liquid - insulator - conductor', the liquid adheres to the surface of the insulator and the contact angle decreases. When electrowetting occurs, the insulator is polarized by the potential difference between the grounded liquid and the conductor, and can charge electric energy equal to the strength of the potential applied to the conductor. By utilizing the energy charged in the insulator, a high-intensity electric field can be maintained even when external power is cut off. This phenomenon can be applied to an electric dust collector as follows.

[0092] Referring to (a) of Fig. 4, when power is applied to the high voltage electrode (330) using the first DC power supply unit (410), a potential difference is generated between the power supply unit (310a, 310b) and the dust collecting electrode (320) by the external power source, and dust collection is performed as a result.

[0093] Referring to (b) of Fig. 4, when a cleaning solution is sprayed between the power supply unit (310a, 310b) and the dust collection electrode (320) through the control unit (420) in a state where dust collection is performed, the dielectric (340) of the power supply unit (310a, 310b) is polarized and charged with electric energy due to the electrowetting phenomenon.

[0094] Referring to (c) of Fig. 4, when the spraying of the cleaning solution is stopped using the control unit (420) and the power applied to the high-voltage electrode (330) is cut off, an electric field is generated between the power application unit (310a, 310b) and the dust collecting electrode (320) by the electric energy charged by the polarization of the dielectric (340), and dust collection is performed using this.

[0095] By repeating the above process at regular intervals, continuous dust collection becomes possible while the external power is cut off. In this case, the cleaning solution periodically sprayed between the power supply unit (310a, 310b) and the dust collecting electrode (320) not only cleans the dust on the surface of the dust collecting electrode, but can also induce polarization of the dielectric (340) of the power supply unit (310a, 310b). At this time, the electric energy charged by the dielectric polarization can be reduced as dust adheres to the surface of the power supply unit (310a, 310b), and this can be minimized by making the polarity of the voltage applied to the ion generating unit (210) and the voltage applied to the high-voltage electrode (330) the same.

[0096] By utilizing the electrowetting phenomenon, power does not need to be constantly supplied to the high voltage electrode (330), so not only can the power consumption of the wet electrostatic precipitator be significantly reduced, but also, even if a spark discharge occurs between the high voltage electrode (330) and the dust collecting electrode (320), the overcurrent is fundamentally blocked (because the power supply to the high voltage electrode is blocked), so the series of fire occurrence processes in which the spark discharge develops into an arc discharge, a spark is generated, and the spark is transferred to a combustible material and the fire spreads can be suppressed.

[0097] Figure 5 is a graph showing the results of a dust collection performance experiment according to the present invention.

[0098] In Fig. 5, the x-axis represents the collection time, and the y-axis represents the collection efficiency after a certain period of time (the collection efficiency at time t after the power is cut off) compared to the initial collection efficiency (the collection efficiency immediately before the power applied to the high-voltage electrode is cut off). At this time, if the y-axis value is 1, it means that the collection efficiency due to the electrowetting phenomenon is the same as the efficiency when the power is continuously applied to the high-voltage electrode. The experiment was conducted by applying power to the high-voltage electrode (330) for 1 minute from the start of the experiment to spray a cleaning solution to induce the electrowetting phenomenon, and then cutting off the cleaning solution and the high voltage applied to the high-voltage electrode (330) after 1 minute, and observing the change in the collection efficiency of the test device for 30 minutes without additional power application. No significant decrease in the efficiency of the test device was observed during the 30-minute experiment. In other words, it was confirmed that the initial dust collection efficiency was maintained for at least 30 minutes with only 1 minute of power used at the beginning of the test, and through this, it was confirmed that polarization using the electrowetting phenomenon and dust collection using it were possible.

[0099] Figure 6 is a flowchart showing a control method using a single dust collection module in one embodiment of the present invention.

[0100] Referring to FIG. 6, in step S610, the first DC power supply is operated by the control unit to supply power to the high voltage pole.

[0101] In step S620, when power is applied, the control unit causes the spray nozzle to spray the cleaning solution between the power application unit and the dust collector.

[0102] In step S630, when sufficient cleaning solution is sprayed to clean dust from the surface of the power supply unit and the dust collecting electrode, the spraying of cleaning solution from the spray nozzle is blocked by the control unit.

[0103] In step S640, the power of the first DC power supply may be cut off by the control unit.

[0104] In step S650, the dielectric of the power supply unit is polarized, so that even if the power of the first DC power supply unit is cut off, a high-intensity electric field is generated between the power supply unit and the dust collector, which can be used to collect dust. At this time, if a timer or a sensor (e.g., a dust sensor) is additionally installed to repeat the operation of the above-described control unit at a regular cycle, it is possible to suppress the occurrence of fire, keep the power supply unit and the dust collector surface clean, and collect dust while minimizing energy consumption.

[0105] FIGS. 7(a) and 7(b) are drawings showing a wet electrostatic precipitator including a plurality of dust collecting modules connected in series according to one embodiment of the present invention.

[0106] Referring to FIGS. 7(a) and 7(b), a wet electrostatic precipitator (700a, 700b) according to another embodiment of the present invention may include a plurality of dust collecting modules (710a, 710b, 710c) connected in series with respect to the direction of flow of the fluid. In FIG. 7, three dust collecting modules are illustrated for convenience of explanation, but the number of dust collecting modules may be expanded to two or three or more depending on the design purpose. Each of the plurality of dust collection modules (710a, 710b, 710c) may include a dust collection housing (130) including a dust collection inlet (131), a dust collection outlet (132), a plurality of power supply units (310a, 310b), a plurality of dust collection poles (320), and a plurality of spray nozzles (161) as shown in FIGS. 3(a), 3(b), and 4, a device connection unit (150) provided on one surface of the dust collection housing (130), a flow partition unit (160) arranged between the device connection unit (150) and the dust collection housing (130), and may further include a dust collection hopper (140a, 140b, 140c).

[0107] When a wet electric dust collector (700a, 700b) is configured by connecting multiple dust collection modules (710a, 710b, 710c) in series, each module may include both a control unit (420) and a first DC power supply unit (410), but preferably, one or more control units (420) and a first DC power supply unit (410) may be configured to control multiple dust collection modules (710a, 710b, 710c) internally and / or externally.

[0108] In other words, each dust collection module (710a, 710b, 710c) can be electrically connected to one control unit (420) and a first DC power supply unit (410) and controlled integrally, and each dust collection module (710a, 710b, 710c) can be electrically connected to a control unit (420) and a first DC power supply unit (410) individually provided and controlled individually.

[0109] For example, in a case where constant power is supplied (when the possibility of fire is relatively low and power cut-off is not necessary, or when the economy of the dust collector is to be increased), the control unit (420) does not need to include a power control function, and one or more first DC power supply units (410) are installed, and each control unit (420) can be electrically connected to one or more dust collection modules (710a, 710b, 710c).

[0110] As another example, when utilizing the electrowetting phenomenon, one or more control units (420) may be installed inside and / or outside the dust collection modules (710a, 710b, 710c). In this case, the control unit (420) controls one or more first DC power units (410) and spray nozzles (161), and the first DC power unit (410) may be configured to be connected to one or more dust collection modules (710a, 710b, 710c) and apply a high voltage to the high voltage electrode.

[0111] Here, the dust collection housing (130), power supply unit (310a, 310b), dust collection pole (320), spray nozzle (161), first DC power supply unit (410), control unit (420), device connection unit (150), and flow compartment unit (160) are described through Fig. 3(a), Fig. 3(b), and Fig. 4, so a detailed description of these components will be omitted below.

[0112] Figure 8 is a flowchart showing a control method for multiple dust collection modules connected in series.

[0113] If the plurality of dust collection modules illustrated in FIG. 7 are divided into a first dust collection module (710a), a second dust collection module (710b), and a third dust collection module (710c) according to the flow of the dust gas, each dust collection module (710a, 710b, 710c) can be sequentially operated by the control method of FIG. 8.

[0114] Referring to FIG. 8, step S810 represents a control method of the first dust collection module, step S820 represents a control method of the second dust collection module, and step S830 represents a control method of the third dust collection module.

[0115] First, step S810 describes the control method of the first dust collection module.

[0116] In step S811, the DC power supply is operated by the control unit to supply power to the high voltage pole.

[0117] In step S812, when power is applied, the control unit causes the spray nozzle to spray the cleaning solution between the power application unit and the dust collector.

[0118] In step S813, when sufficient cleaning solution is sprayed to clean dust from the surface of the power supply unit and the dust collecting electrode, the spraying of cleaning solution from the spray nozzle is blocked by the control unit.

[0119] In step S814, the power of the DC power supply is cut off by the control unit.

[0120] After step S814, the dielectric of the power supply part of the first dust collection module is polarized, so that even if the power of the DC power supply part is cut off, a high-intensity electric field is generated between the power supply part and the dust collection electrode, and dust collection can be performed through this.

[0121] Next, step S820 describes a control method for the second dust collection module. As with the first dust collection module, the control unit operates the DC power supply unit in step S821 to supply power to the high-voltage electrode.

[0122] In step S822, when power is applied, the control unit causes the spray nozzle to spray the cleaning solution between the power application unit and the dust collector.

[0123] In step S823, when sufficient cleaning solution is sprayed to clean dust from the surface of the power supply unit and the dust collecting electrode, the spraying of cleaning solution from the spray nozzle is blocked by the control unit.

[0124] In step S824, the power of the DC power supply is cut off by the control unit.

[0125] After step S824, the dielectric of the power supply part of the second dust collection module is polarized, so that even if the power of the DC power supply part is cut off, a high-intensity electric field is generated between the power supply part and the dust collection electrode, and dust collection can be performed through this.

[0126] Finally, step S830 describes a control method for the third dust collection module. As with the first and second dust collection modules, the control unit operates the DC power supply unit in step S831 to supply power to the high-voltage electrode.

[0127] In step S832, when power is applied, the control unit causes the spray nozzle to spray the cleaning solution between the power application unit and the dust collector.

[0128] In step S833, when sufficient cleaning solution is sprayed to clean dust from the surface of the power supply unit and the dust collecting electrode, the spraying of cleaning solution from the spray nozzle is blocked by the control unit.

[0129] In step S834, the power of the DC power supply is cut off by the control unit.

[0130] After step S834, the dielectric of the power supply part of the third dust collection module is polarized, so that even if the power of the DC power supply part is cut off, a high-intensity electric field is generated between the power supply part and the dust collection electrode, and dust collection can be performed through this.

[0131] That is, in steps S810 to S830, when the first dust collection module is cleaned and polarized, the second dust collection module may be cleaned and polarized next, and when the second dust collection module is cleaned and polarized, the third dust collection module may be cleaned and polarized. This sequential control for each dust collection module can adjust the timing of the cleaning solution spraying, thereby reducing the size of the cleaning solution water tank capacity or the pump for spraying the cleaning solution, thereby saving the installation space of the dust collection device.

[0132] In Fig. 8, the dust collection modules are described as being operated and controlled sequentially, but the control of the individual dust collection modules can be controlled in any order as needed. Since the first dust collection module is the module through which the dust gas passes first, the most dust is collected after the same amount of time, and the third dust collection module installed at the rear may have relatively less dust collected. For this reason, the first, second, and third dust collection modules may have different cleaning cycles. For example, while step S810 may be repeated three times, step S820 may be repeated twice, step S830 may be repeated once, and so on. By controlling each module in different cycles in this way, power consumption can be reduced and the efficiency of the entire system can be increased. In addition, even if a single dust collection module fails to function due to a malfunction, the minimum dust collection performance can be stably maintained. In addition, by minimizing the cleaning of the dust collection module located at the rearmost end, it is possible to minimize external emissions such as cleaning liquid droplets generated by cleaning liquid spray.

[0133] If the sequential control of each dust collection module is performed as one cycle and a timer or sensor (e.g., a dust sensor) is additionally installed to repeat the sequential control of the dust collection module at a certain cycle, dust collection can be performed while suppressing the occurrence of fire and keeping the power supply unit and the surface of the dust collection electrode clean, and minimizing energy consumption. FIGS. 9(a) and 9(b) are drawings showing a wet electric dust collector including a plurality of dust collection modules connected in parallel according to another embodiment of the present invention.

[0134] Referring to FIGS. 9(a), 9(b), and 9(c), a wet electrostatic precipitator (900a, 900b, 900c) according to another embodiment of the present invention may include a plurality of dust collection modules (910a, 910b, 910c) connected in parallel with respect to the direction of flow of the flow. In FIGS. 9(a), 9(b), and 9(c), three dust collection modules are illustrated for convenience of explanation, but the number of dust collection modules may be expanded to two or three or more depending on the design purpose. Each of the plurality of dust collection modules (910a, 910b, 910c) may include a dust collection housing (130) including a dust collection inlet (131), a dust collection outlet (132), a plurality of power supply units (310a, 310b), a plurality of dust collection poles (320), and a plurality of spray nozzles (161) as shown in FIGS. 3(a), 3(b), and 4, a device connection unit (150) provided on one surface of the dust collection housing (130), a flow partition unit (160) arranged between the device connection unit (150) and the dust collection housing (130), and may further include a dust collection hopper (140a, 140b, 140c). A plurality of dust collecting modules connected in parallel can be operated by themselves as in the control method of Fig. 8, but preferably, each dust collecting module may further include a flow opening / closing unit (911a, 911b, 911c) that can open / close the flow of fluid.

[0135] When a wet electric dust collector (900a, 900b) is configured by connecting multiple dust collection modules (910a, 910b, 910c) in parallel, each module may include both a control unit (420) and a first DC power supply unit (410), but preferably, one control unit (420) and a first DC power supply unit (410) may be configured to control multiple dust collection modules (910a, 910b, 910c) internally and / or externally.

[0136] In other words, each dust collection module (910a, 910b, 910c) can be electrically connected to one control unit (420) and a first DC power supply unit (410) and controlled integrally, and each dust collection module (910a, 910b, 910c) can be electrically connected to a control unit (420) and a first DC power supply unit (410) individually provided and controlled individually.

[0137] As an example, when constant power is applied, the control unit (420) does not need to include a power control function, and one or more first DC power supply units (410) are installed, and each control unit (420) can be electrically connected to one or more dust collection modules (910a, 910b, 910c).

[0138] As another example, when utilizing the electrowetting phenomenon, one or more control units (420) may be installed inside and / or outside the dust collection module. In this case, the control unit (420) controls one or more first DC power units (410), and the first DC power units (410) may be configured to be connected to one or more dust collection modules (910a, 910b, 910c) and to apply a high voltage to the high voltage electrode.

[0139] Here, the dust collection housing (130), power supply unit (310a, 310b), dust collection pole (320), spray nozzle (161), control unit (420), first DC power supply unit (410), device connection unit (150), and flow compartment unit (160) are described through Fig. 3(a), Fig. 3(b), and Fig. 4, so their descriptions will be omitted below.

[0140] Each of the dust collection modules (910a, 910b, 910c) and the fluid opening / closing unit (911a, 911b, 911c) illustrated in FIGS. 9(a), 9(b), and 9(c) can be sequentially operated by the control method of FIG. 10.

[0141] Figure 10 is a flowchart showing a control method for multiple dust collection modules connected in parallel.

[0142] Referring to FIG. 10, step S1010 represents a control method of the first dust collection module, step S1020 represents a control method of the second dust collection module, and step S1030 represents a control method of the third dust collection module.

[0143] Specifically, in step S1011, the flow of dust gas flowing into the first dust collection module is blocked by the first flow opening / closing unit.

[0144] In step S1012, the DC power supply is operated by the control unit to supply power to the high voltage pole.

[0145] In step S1013, when power is applied, the control unit causes the spray nozzle to spray the cleaning solution between the power application unit and the dust collector.

[0146] When the cleaning solution is sufficiently sprayed in step S1014 to clean the dust from the surface of the power supply unit and the dust collecting electrode, the spraying of the cleaning solution from the spray nozzle is blocked by the control unit.

[0147] In step S1015, the power of the DC power supply is cut off by the control unit.

[0148] After step S1015, the dielectric of the power supply part of the first dust collection module is polarized, so that even if the power of the DC power supply part is cut off, a high-intensity electric field is generated between the power supply part and the dust collection electrode, and dust collection can be performed through this.

[0149]

[0150] *In step S1016, the flow blocking of the first flow opening / closing unit is turned OFF, so that the dust gas flows back into the first dust collection module.

[0151] Next, step S1020 shows a control method for the second dust collection module.

[0152] In step S1021, the flow of dust gas flowing into the second dust collection module is blocked by the second flow opening / closing unit.

[0153] In step S1022, the DC power supply is operated by the control unit to supply power to the high voltage pole.

[0154] In step S1023, when power is applied, the control unit causes the spray nozzle to spray the cleaning solution between the power application unit and the dust collector.

[0155] In step S1024, when sufficient cleaning solution is sprayed to clean dust from the surface of the power supply unit and the dust collecting electrode, the spraying of cleaning solution from the spray nozzle is blocked by the control unit.

[0156] In step S1025, the power of the DC power supply is cut off by the control unit.

[0157] After step S1025, the dielectric of the power supply part of the second dust collection module is polarized, so that even if the power of the DC power supply part is cut off, a high-intensity electric field is generated between the power supply part and the dust collection electrode, and dust collection can be performed through this.

[0158] In step S1026, the flow blocking of the second flow opening / closing unit is turned OFF, so that the dust gas flows back into the second dust collection module.

[0159] Finally, step S1030 describes a method for controlling the third dust collection module. In step S1031, the flow of dust gas flowing into the third dust collection module is blocked by the third flow opening / closing unit.

[0160] In step S1032, the DC power supply is operated by the control unit to supply power to the high voltage pole.

[0161] In step S1033, when power is applied, the control unit causes the spray nozzle to spray the cleaning solution between the power application unit and the dust collector.

[0162] In step S1034, when the cleaning solution is sufficiently sprayed to clean the dust from the surface of the power supply unit and the dust collecting electrode, the spraying of the cleaning solution from the spray nozzle is blocked by the control unit.

[0163] In step S1035, the power of the DC power supply is cut off by the control unit.

[0164] After step S1035, the dielectric of the power supply part of the third dust collection module is polarized, so that even if the power of the DC power supply part is cut off, a high-intensity electric field is generated between the power supply part and the dust collection electrode, and dust collection can be performed through this.

[0165]

[0166] *In step S1036, the flow blocking of the third flow opening and closing unit is turned OFF, so that the dust gas flows back into the third dust collection module.

[0167] That is, after the flow of the dust gas flowing into the first dust collection module is blocked by the first flow opening, cleaning and polarization of the first dust collection module are performed, and when the cleaning and polarization of the first dust collection module are completed, the dust gas is re-introduced into the first dust collection module by the first flow opening. Thereafter, the flow of the dust gas flowing into the second dust collection module is blocked by the second flow opening, cleaning and polarization of the second dust collection module are performed, and when the cleaning and polarization of the second dust collection module are completed, the dust gas can be re-introduced into the second dust collection module by the second flow opening.

[0168] If the sequential control of each dust collection module is performed as one cycle and a timer or sensor (e.g., dust sensor) is additionally installed to repeat the sequential control of the dust collection module at a certain cycle, dust collection can be performed while minimizing energy consumption and keeping the power supply and dust collection electrode surface clean while suppressing fire occurrence.

[0169] The parallel connection method of the dust collection module as above can also be configured to include a charging housing as shown in Fig. 9(b), in which case there is an advantage in that the amount of dust gas to be processed per charging housing is reduced.

[0170] The parallel connection of dust collection modules can reduce the flow rate of dust gas flowing into each module and block the flow of dust gas into the dust collection module where cleaning is performed, thereby removing dust with high efficiency.

[0171] Although Fig. 10 illustrates that each of the plurality of dust collection modules is sequentially operated and controlled, the individual dust collection modules may be controlled in any order as needed. Furthermore, the dust collection modules may be operated individually. By operating the dust collection modules individually, even if a single dust collection module fails to function properly due to a malfunction, a minimum dust collection performance can be stably maintained, and external emissions such as cleaning solution droplets generated by spraying the cleaning solution can be minimized.

[0172] Figure 11 is a graph showing the amount of dust emitted according to the spray conditions.

[0173] Referring to the graph in Fig. 11, the spray conditions are such that the time for which the cleaning solution is sprayed is approximately 3 seconds, and the time for which the cleaning solution spray is blocked is approximately 57 seconds. This demonstrates that the wet electrostatic precipitator of the present invention maintains its dust collection performance even when the cleaning solution spray is blocked and the power is turned off.

[0174] Although the embodiments described above have been described by way of limited examples and drawings, those skilled in the art will appreciate that various modifications and variations can be made based on the above teachings. For example, appropriate results can still be achieved even if the described techniques are performed in a different order than described, and / or components of the described systems, structures, devices, circuits, etc. are combined or combined in a different manner than described, or are replaced or substituted with other components or equivalents.

[0175] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims described below.

Claims

1. Gas inlet through which gas flows in; A charging housing having a space inside, a charging inlet through which dust gas flows in on one side, a charging outlet through which electrically charged dust is discharged on the other side, and an ion generator for ionizing the dust gas flowing in through the charging inlet; A dust collecting housing having a space inside, a dust collecting inlet connected to the discharge port on one side, and a dust collecting outlet through which clean gas from which dust has been removed is discharged on the other side; A device connection part provided on one side of the above dust collecting housing; A fluid compartment arranged between the device connection portion and the dust collecting housing to partition the dust collecting housing and the device connection portion; and It includes a dust collecting hopper that is connected to and arranged at the bottom of the above dust collecting housing. The above dust collecting housing includes a plurality of power supply units including high-voltage electrodes made of a conductive material and having a dielectric layer formed on the surface, a plurality of dust collecting electrodes made of a conductive material and electrically grounded, a plurality of spray nozzles arranged between the plurality of dust collecting electrodes to spray a cleaning solution, a control unit that controls the inflow of the cleaning solution into the plurality of spray nozzles, and a first direct current power supply unit that applies a high voltage to the plurality of power supply units, wherein the plurality of power supply units and the plurality of dust collecting electrodes are arranged to be spaced apart at regular intervals and alternately disposed, A wet electric precipitator for preventing fire, characterized in that an electrical short circuit does not occur between the plurality of power supply units and the plurality of dust collecting electrodes even when a cleaning liquid is sprayed from the plurality of spray nozzles while a high voltage is applied to the plurality of power supply units by the first DC power supply unit.

2. Gas inlet through which gas flows in; A charging housing having a space inside, a charging inlet through which dust gas flows in on one side, a charging outlet through which electrically charged dust is discharged on the other side, and an ion generator for ionizing the dust gas flowing in through the charging inlet; A dust collecting housing having a space inside, a dust collecting inlet connected to the discharge port on one side, and a dust collecting outlet through which clean gas from which dust has been removed is discharged on the other side; A charging duct that connects the above dust collection outlet and the above charging inlet; A charging pump disposed within the charging duct that sucks in some of the clean gas discharged from the dust collection outlet and discharges it through the charging inlet; A device connection part arranged on one side of the above dust collecting housing; A fluid compartment arranged between the device connection portion and the dust collecting housing to partition the dust collecting housing and the device connection portion; and It includes a dust collecting hopper that is connected to and arranged at the bottom of each of the above dust collecting housings, The above dust collecting housing includes a plurality of power supply units including a high-voltage electrode made of a conductive material and having a dielectric layer formed on the surface, a plurality of dust collecting electrodes made of a conductive material and electrically grounded, a plurality of spray nozzles arranged between the plurality of dust collecting electrodes to spray a cleaning solution, a control unit that controls the inflow of the cleaning solution into the plurality of spray nozzles, and a first direct current power supply unit that applies a high voltage to the plurality of power supply units, wherein the plurality of power supply units and the plurality of dust collecting electrodes are arranged to be spaced apart at regular intervals and alternately disposed, A wet electric precipitator for preventing fire, characterized in that an electrical short circuit does not occur between the plurality of power supply units and the plurality of dust collecting electrodes even when a cleaning liquid is sprayed from the plurality of spray nozzles while a high voltage is applied to the plurality of power supply units by the first DC power supply unit.

3. In paragraph 1 or 2, A wet electrostatic precipitator for preventing fire, wherein the above-mentioned charging housing further includes a second direct current power supply unit that supplies power to the ion generator unit.

4. In paragraph 1 or 2, A wet electrostatic precipitator for preventing fire, further comprising a pre-treatment dust collector arranged between the above-mentioned dust gas inlet and the above-mentioned charging housing.

5. In paragraph 1 or 2, A wet electric precipitator for preventing fire, which polarizes the dielectric by spraying a cleaning solution through the plurality of spray nozzles while power is applied from the first DC power supply, and causes dust in the dust gas to be captured by an electric field generated by the polarization of the dielectric.

6. In paragraph 4, A wet electrostatic precipitator for preventing fire, further comprising at least one of a first heat exchanger for changing the temperature of exhaust gas between the dust gas inlet and the pretreatment dust collector, or a second heat exchanger for changing the temperature of exhaust gas between the pretreatment dust collector and the charging housing.

7. In paragraph 1 or 2, A wet electric precipitator for preventing fire, further comprising a third heat exchanger for changing the temperature of exhaust gas between the charging discharge port of the charging housing and the dust collection inlet port of the dust collection housing.

8. In paragraph 1 or 2, A wet electric dust collector for preventing fire, comprising a fluidized stirring unit between the charging discharge port of the charging housing and the dust collection inlet port of the dust collection housing.

9. Gas inlet through which gas flows in; A charging housing having a space inside, a charging inlet through which dust gas flows in on one side, a charging outlet through which electrically charged dust is discharged on the other side, and an ion generator for ionizing the dust gas flowing in through the charging inlet; It comprises a plurality of dust collection modules including the above charging housing, Each of the above plurality of dust collection modules: A dust collecting housing having a space inside, a dust collecting inlet connected to the discharge port on one side, a dust collecting outlet through which dust-removed gas is discharged on the other side, a plurality of power supply units including high-voltage electrodes made of a conductive material and having a dielectric layer formed on the surface, a plurality of dust collecting electrodes made of a conductive material and electrically grounded, and a plurality of spray nozzles disposed between the plurality of dust collecting electrodes for spraying a cleaning liquid; A device connection part provided on one side of the above dust collecting housing; A fluid compartment arranged between the device connection portion and the dust collecting housing to partition the dust collecting housing and the device connection portion; and A dust collecting hopper is disposed in communication with the lower part of the dust collecting housing, and at least one control unit individually controls the plurality of spray nozzles or the plurality of power supply units included in the plurality of dust collecting modules; and A wet electrostatic precipitator for preventing fire, comprising one or more direct current power supply units for applying high voltage to the above-mentioned plurality of power supply units.

10. Gas inlet through which gas flows in; A charging housing having a space inside, a charging inlet through which dust gas flows in on one side, a charging outlet through which electrically charged dust is discharged on the other side, and an ion generator for ionizing the dust gas flowing in through the charging inlet; It includes a plurality of dust collection modules that are connected to the above charging housing, Each of the above plurality of dust collection modules: A dust collecting housing having a space inside, a dust collecting inlet connected to the discharge port on one side, a dust collecting outlet through which dust-removed gas is discharged on the other side, a plurality of power supply units including high-voltage electrodes made of a conductive material and having a dielectric layer formed on the surface, a plurality of dust collecting electrodes made of a conductive material and electrically grounded, and a plurality of spray nozzles disposed between the plurality of dust collecting electrodes for spraying a cleaning liquid; A device connection part provided on one side of the above dust collecting housing; A fluid compartment arranged between the device connection portion and the dust collecting housing to partition the dust collecting housing and the device connection portion; and It includes a dust collecting hopper that is connected to and arranged at the bottom of the above dust collecting housing, One or more control units individually controlling the plurality of spray nozzles or the plurality of power supply units included in the plurality of dust collection modules; and A wet electrostatic precipitator for preventing fire, comprising one or more direct current power supply units for applying high voltage to the above-mentioned plurality of power supply units.

11. In paragraph 9 or 10, The above plurality of dust collection modules are configured to be connected in series or parallel, A wet electric precipitator for preventing fire, wherein when the plurality of dust collecting modules are connected in parallel, each of the plurality of dust collecting modules includes a flow opening / closing part that opens / closes the flow of the fluid.

12. In paragraph 10, A charging duct that connects the above dust collection outlet and the charging inlet; and A wet electrostatic precipitator for preventing fire, further comprising a charging pump disposed within the charging duct to suck in a portion of the clean gas discharged from the dust collection outlet and discharge it through the charging inlet.

13. In a wet electrostatic precipitation method using a wet electrostatic precipitator, A step in which voltage is applied to a power supply unit by a control unit, and a cleaning solution is sprayed from a plurality of spray nozzles in the control unit; A step of polarizing the dielectric by allowing the above cleaning solution to flow on the dielectric surface; A step in which power supply to the power supply unit is cut off by the control unit, and spraying of the cleaning liquid from the plurality of spray nozzles is cut off by the control unit; A step in which dust in a dust-containing gas passes between the plurality of power supply units and the plurality of dust collecting electrodes and is collected by an electric field formed between the plurality of power supply units and the plurality of dust collecting electrodes due to polarization of the dielectric; A wet electrostatic precipitation method comprising steps in which the spraying step, the polarizing step, the spraying blocking step, and the dust collecting step are repeated at a certain cycle.

14. In a wet electrostatic precipitation method using a wet electrostatic precipitator including a plurality of dust collection modules, A step in which voltage is applied to a plurality of power supply units by a control unit, and a cleaning solution is sprayed from a plurality of spray nozzles by the control unit; A step of polarizing the dielectric by allowing the above cleaning solution to flow on the dielectric surface; A step in which power supply to the plurality of power supply units is cut off by the control unit, and spraying of the cleaning liquid from the plurality of spray nozzles is cut off by the control unit; A step in which dust in a dust-containing gas passes between the plurality of power supply units and the plurality of dust collecting electrodes and is collected by an electric field formed between the plurality of power supply units and the plurality of dust collecting electrodes due to polarization of the dielectric; The above-mentioned step of spraying, the above-mentioned step of polarizing, the above-mentioned step of blocking the spraying; and A wet electrostatic precipitation method, comprising a step of cross-repeating the above dust collecting step for the plurality of dust collecting modules.

15. In a wet electrostatic precipitation method using a wet electrostatic precipitator including a plurality of dust collection modules, A step of blocking the flow of dust gas flowing into the plurality of dust collection modules by a fluid opening / closing unit; A step in which voltage is applied to a plurality of power supply units by a control unit, and a cleaning solution is sprayed from a plurality of spray nozzles by the control unit; A step of polarizing the dielectric by allowing the above cleaning solution to flow on the dielectric surface; A step in which power supply to the plurality of power supply units is cut off by the control unit, and spraying of the cleaning liquid from the plurality of spray nozzles is cut off by the control unit; A step in which a flow of dust-containing gas flowing into a dust collection module is formed by the above-mentioned fluid opening and closing unit; A step in which dust in a dust-containing gas passes between the plurality of power supply units and the plurality of dust collecting electrodes and is collected by an electric field formed between the plurality of power supply units and the plurality of dust collecting electrodes due to polarization of the dielectric; A wet electrostatic precipitator method comprising steps in which the spraying step, the polarizing step, the spraying blocking step, the polarizing step, the spraying blocking step, the flow forming step, and the dust collecting step are alternately repeated for each dust collecting module.

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