KR20200066457A - Apparatus for treating contaminant gas - Google Patents

Abstract

According to an embodiment of the present invention, provided is an apparatus of treating polluted gas, capable of increasing operating stability of the apparatus. The apparatus of treating polluted gas comprises a separation supply unit, a storage unit, a pulse discharge unit, a cleaning unit and an electric dust collection unit. Polluted gas is introduced into the separation supply unit, and reaction gas for promoting decomposition reaction of the polluted gas is stored in the storage unit. In addition, the pulse discharge unit receives the polluted gas and the reaction gas through the separation supply unit and makes the supplied polluted gas into plasma so as to reform nitrogen monoxide contained in the polluted gas into nitrogen dioxide and to reduce sulfur oxides contained in the polluted gas. The cleaning unit provides cleaning water for inducing absorption reduction treatment of nitrogen dioxide, and the electric dust collection unit collects particulate matters. The separation supply unit separates particulate reaction matters generated by reaction between the polluted gas and the reaction gas from the polluted gas and the reaction gas, which are in a gas state, and allows only the polluted gas and the reaction gas, which are separated and in the gas state, to be moved to the pulse discharge unit.

Description

Pollution gas treatment system {APPARATUS FOR TREATING CONTAMINANT GAS}

The present invention relates to a pollutant gas treatment device, and more particularly, to a pollutant gas treatment device capable of increasing the operational stability of the device.

In general, power plants with large-scale combustion facilities, steel mills, incinerators, etc. may generate precursors that generate secondary fine dust such as nitrogen oxides (NOx) and sulfur oxides (SOx) together with particulate matter.

In particular, since most of the fine dust of PM2.5, which is known to be harmful to the human body, consists of secondary fine dust, the treatment method for nitrogen oxides and sulfur oxides is becoming more important. Pollution gas treatment devices are installed in steelworks and incinerators.

In the case of nitrogen oxides, selective catalytic reduction (SCR) is used for nitrogen oxides, and sulfur oxides are widely commercialized by treating particulate matter with an electrostatic precipitator followed by flue gas desulfurization (FGD).

1 is an exemplary view showing an example of a conventional pollution gas treatment apparatus.

As shown in FIG. 1, a pollutant gas treatment apparatus that has been recently used has a plasma reaction unit 10 and an electrostatic precipitator 20.

The plasma reaction unit 10 has a high voltage applied discharge electrode and a corresponding ground electrode, and when a high voltage pulse voltage is applied between the discharge electrode and the ground electrode, and when an additive gas such as ammonia (NH ₃ ) or HC gas is supplied, nitrogen in the pollution gas (G) Oxide (NOx) is converted to nitrate and sulfur oxide (SOx) is converted to sulfate. The converted nitrate and sulfate are converted into particulate matter such as ammonium nitrate and ammonium sulfate, and collected and removed by the electrostatic precipitator 20 installed at the rear end.

However, in the conventional pollutant gas treatment apparatus, at the inlet end of the plasma reaction unit, the polluted gas and the additive gas react in advance to generate particulate matter, and when these particulate matter is accumulated in the supply pipe, there is a problem that the supply pipe is blocked. In this case, there is a problem in that the operation of the processing device is stopped and the particulate material blocking the supply pipe must be removed and restarted.

Republic of Korea Patent Publication No. 2010-0136607 (2010.12.29. public)

In order to solve the above problems, a technical problem to be achieved by the present invention is to provide a pollutant gas treatment device capable of increasing the operational stability of the device.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. There will be.

In order to achieve the above technical problem, an embodiment of the present invention is a separate supply unit to which the polluted gas flows; A storage unit in which reaction gas for accelerating the decomposition reaction of the polluted gas is stored; The pollutant gas and the reaction gas are supplied through the separation supply unit, and the supplied pollutant gas is plasmad to reform nitrogen monoxide contained in the pollutant gas into nitrogen dioxide, and to reduce sulfur oxides contained in the pollutant gas. A pulse discharge unit; A washing unit provided with washing water for inducing absorption reduction treatment of nitrogen dioxide discharged from the pulse discharge unit; And it includes an electric dust collecting unit for collecting particulate matter discharged from the washing unit by generating an electric field, the separation supply unit is a gaseous pollutant and the particulate reactant generated by the reaction of the polluted gas and the reaction gas and Provided is a pollutant gas treatment apparatus characterized in that it is separated from the reaction gas and only the separated gaseous pollutant gas and the reaction gas are moved to the pulse discharge unit.

In an embodiment of the present invention, the separation supply unit is provided with a main chamber in which an orbiting space is formed inside, and an eccentrically provided and supplied contaminant gas on one side of an outer circumferential surface of the main chamber to the orbiting space A first port discharged in the direction, a second port provided eccentrically in the center of the main chamber on the other side of the outer circumferential surface of the main chamber, and a second port discharged in a tangential direction to the turning space, and the main chamber It is provided at the lower end of the, the collection chamber in which the particulate reactant produced by the reaction of the contaminant gas and the reaction gas in the pivot space is provided, and the upper end of the main chamber, the inlet end of the pulse discharge unit It may have a discharge port that is connected to the gaseous pollutant gas and the reaction gas in which the particulate reactant is separated is supplied to the inlet end of the pulse discharge unit.

In an embodiment of the present invention, the second port includes a first pipe through which the supplied reaction gas is discharged to the turning space, and an outlet end of the first pipe after the reaction gas is discharged from the first pipe In order to prevent the reaction gas from reacting with the polluted gas, a sheath air surrounding the outer side of the reaction gas discharged from the first tube is provided so as to surround the first tube with a concentric shaft with the first tube. You can have a second tube to make it possible.

In an embodiment of the present invention, the first port and the second port may be provided to be opposite to each other based on the center of the main chamber.

According to an embodiment of the present invention, a separate supply unit is provided, and the particulate reactant is separated using a centrifugal force generated by the swirling flow of the polluted gas and the reactant gas, and only the gaseous polluted gas and the reactant gas are pulsed discharge units. Can be moved. Through this, since the amount of the particulate reactant generated at the inlet end of the pulse discharge portion can be made small, it is possible to effectively prevent clogging and improve the operational stability of the device.

In addition, according to an embodiment of the present invention, the second port is composed of a double pipe having the same axis, the reaction gas is discharged to the first pipe inside, and the sheath air is discharged from the second pipe outside. It is possible to prevent the reaction gas from reacting with the polluted gas at the outlet end of the first tube immediately after the reaction gas is discharged from the tube. Through this, the outlet end of the second port can be effectively prevented from being blocked by particulate reactants generated by the reaction of the polluted gas and the reactive gas, and it is possible to increase the operational stability of the device.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be deduced from the configuration of the invention described in the detailed description or claims of the invention.

1 is an exemplary view showing an example of a conventional pollution gas treatment apparatus.
2 is an exemplary view schematically showing a pollutant gas treatment apparatus according to an embodiment of the present invention.
Figure 3 is a perspective view showing a separate supply of the pollutant gas treatment apparatus according to an embodiment of the present invention.
Figure 4 is a plan view showing a cross-section of a separate supply unit of the pollution gas treatment apparatus according to an embodiment of the present invention.
5 is an exemplary front cross-sectional view showing a separate supply unit of a pollution gas treatment apparatus according to an embodiment of the present invention.
6 is an exemplary cross-sectional view showing a second port of a separate supply part of a pollution gas processing apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and thus is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is “connected (connected, contacted, coupled)” with another part, it is not only “directly connected”, but also “indirectly connected” with another member in between. It also includes the case where it is. Also, when a part “includes” a certain component, this means that other components may be further provided, not excluding other components, unless otherwise stated.

The terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms “include” or “have” are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

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

2 is an exemplary view schematically showing a pollutant gas treatment apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the pollutant gas treatment apparatus may include a separate supply unit 200, a storage unit 300, a pulse discharge unit 500, a cleaning unit 600, and an electric dust collecting unit 700.

Hereinafter, for convenience of description, it will be described as the front end/front end/entrance/entrance end, rear end/rear end/outlet/outlet end based on the gas flow direction. That is, when the gas is moved from the first point to the second point, the first point will be described as the front end/front end/entrance/entrance end and the second point as the rear end/rear end/outlet/outlet end.

The first supply flow path 100 may supply polluted gas.

The separation supply unit 200 may be connected to the rear end of the first supply channel unit 100, and the polluted gas supplied through the first supply channel unit 100 may be introduced into the separation supply unit 200.

The storage unit 300 may store a reaction gas for promoting a decomposition reaction of the polluted gas.

The reaction gas can be introduced into the pulse discharge unit 500 through the separation supply unit 200 to promote the decomposition reaction of the polluted gas, and the reaction gas is ammonia (NH ₃ ), carbon monoxide (CO), urea (CO( HC consisting of aliphatic hydrocarbons including NH ₂ ) ₂ ), water vapor (H ₂ O) and methane (CH ₄ ), ethylene (C ₂ H ₄ ), propylene (C ₃ H ₆ ), butane (C ₄ H ₁₀ ) At least one gas group may be selected.

The storage unit 300 may have a plurality of storage containers, and different reaction gases may be stored in each storage container.

For example, ammonia (NH ₃ ) may be stored in the first storage container 310, and HC gas may be stored in the second storage container 320.

The second supply channel 400 may supply the reaction gas stored in the storage unit 300 to the separation supply unit 200. When the storage unit 300 has a plurality of storage containers, the second supply channel 400 may be provided to correspond to the storage container. That is, the second supply flow path part 400 separates any one of the second supply flow path parts 401 and the second storage container 320 that connects the first storage container 310 to the separate supply part 200. It may have another second supply flow path portion 402 to connect with (200).

The pulse discharge part 500 may be connected to the separation supply part 200 through the guide flow passage 511, and the guide flow passage 511 may be connected to the inlet end 510 of the pulse discharge part 500.

The pulse discharge unit 500 receives pollutant gas and reaction gas through the separation supply unit 200, plasmas the supplied pollutant gas, and reforms nitrogen monoxide (NO) contained in the pollutant gas into nitrogen dioxide (NO ₂ ). , It can reduce the sulfur oxides (SOx) contained in the polluted gas.

The pulse discharge unit 500 may generate a high pressure pulse, for example, a nanosecond pulse discharge.

The washing unit 600 may provide washing water 601 for inducing absorption reduction treatment of nitrogen dioxide discharged from the pulse discharge unit 500.

When a high pressure pulse is generated in the pulse discharge unit 500, nitrogen monoxide (NO) contained in the contaminant gas may be oxidized to become nitrogen dioxide. Since nitrogen dioxide has hydrophilicity, the washing water passes through the washing unit 600. 601.

If nitrogen dioxide is continuously absorbed in the washing water, the washing water is acidified, and the capture performance of nitrogen dioxide may be deteriorated. To prevent this, a reducing agent may be included in the washing water.

The reducing agent may induce the absorption reduction treatment of nitrogen dioxide absorbed in the washing water to neutralize the washing water, and through this, nitrogen dioxide may be continuously absorbed in the washing water to maintain the capture performance.

The reducing agent may include one or more of sodium hydroxide (NaOH), sodium hydrogen sulfide (NaHS), sodium sulfide (Na ₂ S), sodium sulfite (Na ₂ SO ₃ ), and sodium thiosulfate (Na ₂ S ₂ O ₃ ). .

The washing water of the washing unit 600 may be circulated to the pulse discharge unit 500 through the pump 610 and the circulation passage 620. By circulating the washing water to the pulse discharge unit 500, it is possible to extend the time that nitrogen dioxide generated in the pulse discharge unit 500 can be absorbed in the washing water.

The electrostatic precipitator 700 may be connected to the cleaning unit 600 through a movement passage 710. The electrostatic precipitator 700 may generate an electric field and may collect particulate matter discharged from the rinse 600.

For example, the electric dust collecting unit 700 may be applied with a high voltage to generate an electric field between the dust collecting plates (not shown), and the mist included in the polluted gas moved in the washing unit 600 by the electric field thus formed, Particulate Matters (PM) such as fine particles may be collected in a dust collecting plate.

Gas through which the particulate matter has been removed while passing through the electrostatic precipitator 700 may be discharged through the discharge passage 720.

Hereinafter, the separation supply unit 200 will be described in detail.

Figure 3 is a perspective view showing a separate supply of the pollutant gas treatment apparatus according to an embodiment of the present invention, Figure 4 is a plan view showing a cross-section of a separate supply of a pollutant gas treatment apparatus according to an embodiment of the present invention, 5 is an exemplary front cross-sectional view showing a separate supply unit of a pollutant gas treatment apparatus according to an embodiment of the present invention.

3 to 5, the separation supply unit 200 may have a main chamber 210, a first port 220, a second port 230, a collection chamber 240 and a discharge port 250 have.

A turning space 211 may be formed inside the main chamber 210.

The first port 220 may be provided eccentrically in the center of the main chamber 210 on one side of the outer circumferential surface of the main chamber 210. The first port 220 may be connected to the first supply channel portion 100, and the first port 220 may turn the polluted gas 1 supplied through the first supply channel portion 100 into a turning space 211. It can be discharged in the tangential direction.

The second port 230 may be provided eccentrically in the center of the main chamber 210 on the other side of the outer circumferential surface of the main chamber 210. The second port 230 may be connected to the second supply channel portion 400, and the second port 230 may rotate the reaction gas 2 supplied through the second supply channel portion 400 to the turning space 211. It can be discharged in the tangential direction.

The first port 220 and the second port 230 may be formed above the main chamber 210.

In addition, as shown in FIG. 4, the first port 220 and the second port 230 may be provided to be opposite to each other based on the center of the main chamber 210. Accordingly, the turning direction of the pollutant gas 1 discharged from the first port 220 and the turning direction of the reaction gas 2 discharged from the second port 230 may be the same. That is, the contaminant gas 1 and the reaction gas 2 may respectively flow into the turning space 211 in a tangential direction and then become downward turning flows and move spirally.

The collection chamber 240 may be provided at the lower end of the main chamber 210, and the collection chamber 240 has a particulate form generated by the reaction of the polluted gas 1 and the reaction gas 2 in the orbiting space 211. Reactant 3 may be collected.

That is, in the turning space 211, the pollutant gas 1 and the reactant gas 2 are reacted with each other while turning, and the particulate reactants 3 generated by gravity fall down by gravity, and are collected in the collecting chamber 240. Can be.

A stopper 241 may be further fastened to the lower end portion of the collection chamber 240, and the stopper 241 may open and close the lower end portion of the capture chamber 240. The particulate reactant 3 collected in the collection chamber 240 can be easily removed after separating the stopper 241 from the collection chamber 240.

Alternatively, the lower end of the collection chamber 240 may be formed to be blocked, and in this case, the collection chamber 240 is configured to be detachably coupled to the main chamber 210, and the collection chamber 240 is the main chamber 210. After being separated from, it may be to remove the particulate reactant (3) collected in the collection chamber 240.

The turning flow of the polluted gas 1 and the reaction gas 2 in the turning space 211 may be an upward turning flow by reversing the flow direction at the pointed ends of the collecting chamber 240.

The discharge port 250 may be provided at the upper end of the main chamber 210, and the discharge port 250 is an inlet end of the pulse discharge unit 500 (see FIG. 2) through a guide flow path 511 (see FIG. 2). 510, see FIG. 2).

The discharge port 250 is a gaseous pollutant gas (1) and a reaction gas (2) with a particulate reactant (3) is separated and having an upward turning flow to the inlet end (510) of the pulse discharge unit (500) Can be supplied.

As such, the separation supply unit 200 may be a cyclone that separates and collects particulate reactants 3 by using centrifugal force generated by swirling flows of the contaminant gas 1 and the reaction gas 2.

If there is no separation supply unit 200 according to the present invention, the first supply channel unit 100 (refer to FIG. 2) and the second supply channel unit 400 (refer to FIG. 2) have an inlet end 510 of the pulse discharge unit 500. ), the reaction gas and the contaminant gas react at the outlet end of the second supply flow path 400 to generate and accumulate particulate reactants. The inlet end 510 of the whole 500 may be clogged.

However, as in the present invention, the separation supply unit 200 is provided, and the particulate reactant is separated using centrifugal force generated by the swirling flow of the contaminant gas 1 and the reaction gas 2, and the gaseous contamination When only the gas and the reaction gas are moved to the pulse discharge unit 500, the amount of particles of the reactant produced at the inlet end 510 of the guide flow path 511 and the pulse discharge unit 500 decreases, and thus clogging phenomenon This can be effectively prevented.

A plurality of second ports 230 may be formed in the height direction of the main chamber 210, and different types of reaction gases may be supplied through each second port.

For example, ammonia is supplied to the second port 230 provided on the top side, and HC gas is supplied to the second port 230a provided on the next highest side, and the second port provided on the bottom side. Another reaction gas may be supplied to 230b.

On the other hand, Figure 6 is an exemplary cross-sectional view showing a second port of the separation supply of the pollutant gas treatment apparatus according to an embodiment of the present invention.

As shown in FIG. 6, the second port 230 may have a first tube 231 and a second tube 232.

The first pipe 231 may be connected to the second supply flow path 400, and the first pipe 231 may have a reaction gas 2 supplied through the second feed flow path 400 to the turning space 211. Can be discharged.

The second pipe 232 may be provided to surround the first pipe 231 with a concentric shaft with the first pipe 231, and accordingly, the second port 230 may be formed in a double pipe shape. In addition, the second pipe 232 may allow the sheath air 4 to be discharged.

Since the sheath air 4 discharged from the second pipe 232 may be discharged while surrounding the outside of the reaction gas 2 discharged from the first pipe 231, the first pipe in the turning space 211 ( In the region 212 adjacent to the outlet end of 231), the reaction gas 2 may be prevented from reacting with the polluted gas.

That is, since the reaction gas 2 is discharged from the first pipe 231 and the sheath air 4 is discharged from the outlet end of the second pipe 232, the polluted gas introduced into the turning space 211 is It can be pushed out by the sheath air 4, and the region 212 adjacent to the outlet end of the first pipe 231 does not have a contaminant gas, or it can be made to have an extremely small amount.

Therefore, it is possible to prevent the reaction gas 2 from reacting with the polluted gas at the outlet end of the first tube 231 immediately after the reaction gas 2 is discharged from the first tube 231. Through this, the outlet end of the second port 230 can be effectively prevented from being blocked by particulate reactants produced by the reaction of the polluted gas and the reaction gas, and it is possible to increase the operational stability of the device.

The above description of the present invention is for illustration only, and a person having ordinary knowledge in the technical field to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present invention.

1: Pollution gas 2: Reaction gas
3: Particulate reactants 4: Sheath air
100: first supply channel 200: separate supply
210: main chamber 211: turning space
220: Port 1 230: Port 2
231: Building 1 232: Building 2
240: collection chamber 250: discharge port
300: storage unit 400: second supply channel
500, pulse discharge unit 600: cleaning unit
700: electrostatic precipitator

Claims (4)

Separated supply unit to which the polluted gas flows;
A storage unit in which reaction gas for accelerating the decomposition reaction of the polluted gas is stored;
The pollutant gas and the reaction gas are supplied through the separation supply unit, and the supplied pollutant gas is plasmad to reform nitrogen monoxide contained in the pollutant gas into nitrogen dioxide, and to reduce sulfur oxides contained in the pollutant gas. A pulse discharge unit;
A washing unit provided with washing water for inducing absorption reduction treatment of nitrogen dioxide discharged from the pulse discharge unit; And
And an electrostatic precipitator that collects particulate matter discharged from the cleaning unit by generating an electric field.
The separation supply unit separates the pollutant gas and the particulate reactant produced by the reaction of the reaction gas from the gaseous pollutant gas and the reaction gas, and only the separated gaseous pollutant gas and reaction gas are transferred to the pulse discharge unit. Pollution gas treatment device characterized in that to be moved. According to claim 1,
The separation supply unit
A main chamber in which a turning space is formed inside,
A first port provided eccentrically in the center of the main chamber on one side of the outer circumferential surface of the main chamber and discharging supplied pollutant gas in a tangential direction to the turning space;
A second port provided eccentrically in the center of the main chamber on the other side of the outer circumferential surface of the main chamber, and discharging the supplied reaction gas tangentially to the turning space;
It is provided at the lower end of the main chamber, the collecting chamber in which the particulate matter produced by the reaction of the polluted gas and the reaction gas in the pivot space is collected,
The discharge port is provided at the upper end of the main chamber and is connected to the inlet end of the pulse discharge part to supply the gaseous polluted gas and reaction gas separated from the particulate reactant to the inlet end of the pulse discharge part. Pollution gas treatment apparatus characterized by having. According to claim 2,
The second port
A first pipe through which the supplied reaction gas is discharged to the turning space;
After the reaction gas is discharged from the first tube, it is provided to surround the first tube with a concentric axis with the first tube so that the reaction gas does not react with the polluted gas at the outlet end of the first tube. A contaminant gas treatment apparatus comprising a second pipe through which sheath air surrounding the outside of the reaction gas discharged from the first pipe is discharged. According to claim 2,
The first port and the second port are polluted gas treatment apparatus characterized in that provided to be opposite to each other based on the center of the main chamber.

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