KR20210081477A - Apparatus for treating harmful gas and method of treating harmful gas - Google Patents

Abstract

One embodiment of the present invention provides an apparatus for processing harmful gas to increase processing efficiency of the harmful gas and a harmful gas processing method using the same. According to the present invention, the apparatus for processing harmful gas comprises: an additive supply unit signal an additive to the inside of a flow path to allow the additive to come in contact with harmful gas moving inside the flow path; a spray unit spraying water on the inside of the flow path to allow the water to be mixed with the harmful gas; a mixing guide unit provided at the rear end of the additive supply unit and the spray unit in the flow path, and inducing contact between the harmful gas and the additive and mixing of the harmful gas and the sprayed water; an ion generation unit provided at the rear end of the mixing induction unit in the flow path unit and generating ions by causing a corona discharge; a salt particle generation unit provided at the rear end of the ion generation unit in the flow path and causing a pulse discharge to mix the harmful gas and the ions to generate salt particles of noxious gas; and an electric dust collection unit provided at the rear end of the salt particle generation unit the flow path and collecting the salt particles.

Description

Hazardous gas treatment device and harmful gas treatment method {APPARATUS FOR TREATING HARMFUL GAS AND METHOD OF TREATING HARMFUL GAS}

The present invention relates to a noxious gas treatment apparatus and a noxious gas treatment method, and more particularly, to a noxious gas treatment device and a noxious gas treatment method capable of increasing the treatment efficiency of the noxious gas.

In general, precursors for generating secondary fine dust, such as nitrogen oxides (NOx) and sulfur oxides (SOx), together with particulate matter, may be generated in power plants, steel mills, and cauldrons equipped with large-scale combustion facilities.

In particular, since most of PM2.5, which is known to be harmful to the human body, consists of secondary fine dust, treatment methods for nitrogen oxides and sulfur oxides are becoming more important, and to treat them, power plants equipped with large-scale combustion facilities, Exhaust gas treatment devices are installed in steel mills and slaughterhouses.

In the case of exhaust gas treatment equipment, selective catalytic reduction (SCR) is used for nitrogen oxides, and for sulfur oxides, it is widely used after treating particulate matter with an electrostatic precipitator and then treating them with flue gas desulfurization (FGD). has been commercialized.

On the other hand, selective catalytic reduction (SCR) requires maintaining a high temperature of 300° C. or higher, and performance degradation may occur due to catalyst poisoning. In addition, flue gas desulfurization (FGD) has a problem in that the device is very large and mist is discharged to the rear end to contaminate the heat exchanger.

Therefore, there is a demand for a new process treatment technology to improve the nitrogen oxide and sulfur oxide treatment efficiency.

Republic of Korea Patent Publication No. 2010-0136607 (published on December 29, 2010)

In order to solve the above problems, the technical problem to be achieved by the present invention is to provide a harmful gas treatment apparatus and a noxious gas treatment method capable of increasing the treatment efficiency of the noxious gas.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

In order to achieve the above technical object, an embodiment of the present invention is an additive supply unit for supplying an additive to the inside of the flow path so as to be in contact with the harmful gas moving inside the flow path part; a spraying unit for spraying water inside the flow path to be mixed with the harmful gas; a mixing inducing unit provided at the rear end of the additive supply unit and the spraying unit in the flow path and inducing contact between the harmful gas and the additive and mixing of the harmful gas and the sprayed water; an ion generating unit provided at a rear end of the mixing induction unit in the flow path unit to generate ions by generating a corona discharge; a salt particle generating unit provided at a rear end of the ion generating unit in the flow path and generating a pulse discharge so that the noxious gas and the ions are mixed to generate salt particles of the noxious gas; And it is provided at the rear end of the salt particle generating unit in the flow path, it provides a harmful gas treatment device, characterized in that it comprises an electric dust collector for collecting the salt particles.

In an embodiment of the present invention, it may include a heating part provided between the flow path part and the additive supply part and raising the temperature of the additive supplied from the additive supply part.

In an embodiment of the present invention, the ion generating unit includes a plurality of first grounding electrodes extending in the longitudinal direction of the flow passage inside the flow passage, and having a hollow tube shape, and the first ground electrode inside the first ground electrode. It may have a first discharge electrode extending in the longitudinal direction of the first ground electrode, and a first voltage applying unit for applying a voltage to the first discharge electrode.

In an embodiment of the present invention, a receiving tank provided under the salt particle generating unit and the electrostatic precipitating unit, in which washing water is accommodated, and the washing water in the receiving tank are supplied to the salt particle generating unit and the electrostatic precipitating unit. It includes a washing water supply unit having a supply pump, and the washing water accommodated in the receiving tank may be washing water received by flowing downward while absorbing the salt particles in the electric dust collecting unit.

In an embodiment of the present invention, the salt particle generating unit is formed extending vertically on the inside of the flow path part, and a plurality of second grounding electrodes having a guide flow path inside for guiding the movement of the harmful gas and the ions, and the It has a second discharge electrode extending in the longitudinal direction of the second ground electrode inside the second ground electrode, and a second voltage applying unit that applies a pulse voltage to the second discharge electrode, and is supplied by the washing water supply unit. The washing water used may flow along the inner circumferential surface of the guide passage.

In an embodiment of the present invention, the electric dust collecting part extends vertically inside the flow path part, and includes a plurality of third grounding electrodes having a collecting flow path through which the salt particles moving inward are collected, and the third grounding electrode has a third discharge electrode extending in the longitudinal direction of the third ground electrode on the inside of the and a third voltage applying unit for applying a voltage to the third discharge electrode, and the washing water supplied by the washing water supply unit is It can flow along the inner circumferential surface of the collection passage.

On the other hand, in order to achieve the above technical problem, an embodiment of the present invention is an additive supply step of supplying an additive to the inside of the flow path portion so as to be in contact with the harmful gas moving inside the flow passage; a spraying step of spraying water inside the flow path to be mixed with the harmful gas; a mixing induction step of inducing contact between the harmful gas and the additive and mixing of the noxious gas and the sprayed water; An ion generating step of generating ions by causing a corona discharge; a salt particle generation step of generating salt particles of the noxious gas by mixing the noxious gas and the ions by generating a pulse discharge; And it provides a harmful gas treatment method comprising the electrostatic precipitation step of collecting the salt particles.

In an embodiment of the present invention, a heating step of increasing the temperature of the additive before it is introduced into the flow passage may be included.

According to an embodiment of the present invention, since harmful particles in the gas phase included in the harmful gas can be generated as salt particles and electrostatically collected, the dust collection efficiency can be increased. That is, the dust collection can be easier and more effective when the harmful particles are in the gaseous state than in the gaseous state. In the present invention, since the harmful particles are generated and collected as salt particles, the processing efficiency of the harmful gas can be increased.

In addition, according to an embodiment of the present invention, by preheating the supplied additive and supplying moisture and ions, the size of the salt particles produced can be increased and the growth of the salt particles can be promoted to increase the dust collection efficiency. In addition, the concentration of the additive can be reduced, and the problem of ammonia slip can be reduced.

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 inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is an exemplary view showing a harmful gas processing apparatus according to a first embodiment of the present invention.
2 is an exemplary view showing an ion generating unit of the harmful gas processing apparatus according to the first embodiment of the present invention.
3 is an exemplary view showing a salt particle generation unit of the harmful gas processing apparatus according to the first embodiment of the present invention.
4 is an exemplary view showing an electric dust collector of the harmful gas processing apparatus according to the first embodiment of the present invention.
5 is a graph showing changes in water concentration and particle size according to humidity in the harmful gas processing apparatus according to the first embodiment of the present invention.
6 is a graph showing changes in water concentration and particle size according to the presence or absence of pulse discharge and ion generation processes in the harmful gas processing apparatus according to the first embodiment of the present invention.
7 is a graph showing the change in the concentration of the additive according to the presence or absence of moisture supply, ion generation, and additive preheating process in the harmful gas processing apparatus according to the first embodiment of the present invention.
8 is an exemplary view showing a harmful gas processing apparatus according to a second embodiment of the present invention.
9 is a flowchart illustrating a harmful gas treatment method according to a first embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached 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. “Including cases where it is In addition, when a part "includes" a certain component, this means that other components may be further provided without excluding other components unless otherwise stated.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

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

1 is an exemplary view showing a harmful gas processing apparatus according to a first embodiment of the present invention.

As shown in FIG. 1 , the harmful gas processing apparatus includes an additive supply unit 200 , a spray unit 300 , a mixing induction unit 400 , an ion generation unit 500 , a salt particle generation unit 600 and an electric dust collector 700 . may include.

In this embodiment, the flow path part 100 may have a first flow path part 110 provided in a horizontal direction and a second flow path part 120 provided in a vertical direction. The first flow path part 110 may be connected to the lower end of the second flow path part 120 . The noxious gas (G) may move in the horizontal direction along the first flow path part 110 and then may be introduced into the second flow path part 120 to move upward.

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

The additive supply unit 200 may supply the additive 201 to the inside of the flow path part 100 so as to be in contact with the harmful gas G moving inside the flow path part 100 . Specifically, the additive supply unit 200 may be provided at the inlet end of the first flow path unit 110 .

The noxious gas G may include a gaseous noxious substance such as nitrogen oxide (NOx) or sulfur oxide (SOx). And, the additive 201 may include ammonia (NH ₃ ) or propylene (C ₃ H ₆ ).

When the additive 201 is supplied to the flow path part 100 , the contact between the harmful gas (G) and the hydrogen (H) is further promoted, so that the mixing effect with the harmful gas can be improved.

The spray unit 300 may spray water on the inside of the flow path unit 100 to be mixed with the harmful gas (G). Specifically, the spray unit 300 may be provided at the inlet end of the first flow path unit 110 . The spray unit 300 may supply water 303 to the flow path unit 100 in the form of mist by mixing the supplied water 301 and air 302 . The moisture 303 supplied to the flow passage 100 may be mixed with the harmful gas G to help increase the reaction effect to be carried out later.

For example, when water 303 is supplied from the spray unit 300 to the first flow path unit 110 , sulfuration of sulfur dioxide (SO ₂ ) may be induced (SO ₃ +H ₂ O -> H ₂ SO ₄ ). have.

On the other hand, the harmful gas processing apparatus may include a heating unit (800). The heating unit 800 may be provided between the flow path unit 100 and the additive supply unit 200 . By increasing the temperature of the additive 201 supplied from the additive supply unit 200 , the additive 201 having an increased temperature may be introduced into the flow path unit 100 .

The heating unit 800 may increase the temperature of the additive 201 to 50-100° C. or more, and the preheated additive 201 may have a higher diffusion power, so that the mixing effect with the harmful gas may be increased in the mixing induction unit 400 .

The mixing guide unit 400 may be provided at the rear end of the additive supply unit 200 and the spray unit 300 in the flow path unit 100 . The mixing induction unit 400 may induce contact between the harmful gas G and the additive 201 . In addition, the mixing guide unit 400 may induce mixing of the harmful gas (G) and the sprayed moisture (303).

The mixing guide unit 400 may have a mixing rib 410 that allows the moving harmful gas G, the additive 201 and the moisture 303 to be effectively mixed.

The ion generating unit 500 may be provided at the rear end of the mixing inducing unit 400 in the flow path unit 100 . The ion generating unit 500 may generate a large amount of ions (I) by generating a corona discharge.

2 is an exemplary view showing an ion generating unit of the harmful gas processing apparatus according to the first embodiment of the present invention.

2 , the ion generating unit 500 may include a first ground electrode 510 , a first discharge electrode 520 , and a first voltage applying unit 530 .

The first ground electrode 510 may be formed to extend inside the first flow path part 110 in the longitudinal direction of the first flow path part 110 . The first ground electrode 510 may be formed in a hollow tube shape. In addition, a plurality of first ground electrodes 510 may be provided along the cross-sectional direction of the first flow path part 110 .

The first discharge electrode 520 may be provided inside the first ground electrode 510 to extend in the longitudinal direction of the first ground electrode 510 . The first discharge electrode 520 may be formed in a wire shape. The first voltage applying unit 530 may apply a voltage to the first discharge electrode 520 .

A positive (+) voltage may be applied to the first discharge electrode 520 from the first voltage applying unit 530 , and the first ground electrode 510 may be grounded. Alternatively, a negative (-) voltage may be applied to the first ground electrode 510 from the first voltage applying unit 530 . Through this, corona discharge may occur between the first ground electrode 510 and the first discharge electrode 520 , and a large amount of radical ions such as _{oxygen (O), hydroxide (OH), water (H 2 O), etc.} can be created.

The first discharge electrode 520 may be a carbon fiber discharge electrode, and may have a diameter of 5 to 10 μm. Through this, the first discharge electrode 520 may generate a corona discharge at a relatively low voltage. That is, even when the applied voltage is low, it is possible to generate ions with a high concentration.

The salt particle generating unit 600 may be provided at the rear end of the ion generating unit 500 in the flow path unit 100, and by generating a pulse discharge, harmful gas (G) and ions (I) are mixed to produce harmful gas (G) of salt particles.

3 is an exemplary view showing a salt particle generation unit of the harmful gas processing apparatus according to the first embodiment of the present invention.

3 , the salt particle generation unit 600 may have a second ground electrode 610 , a second discharge electrode 620 , and a second voltage application unit 630 .

The second ground electrode 610 may be vertically extended inside the flow path part 100 , specifically, the second flow path part 120 . The second ground electrode 610 may have a guide flow path 611 for guiding the movement of harmful gases (G) and ions (I) inside. The guide passage 611 may be formed through the upper end and lower end of the second ground electrode 610 . In addition, a plurality of second ground electrodes 610 may be provided along the cross-sectional direction of the second flow path part 120 , and each adjacent second ground electrode 610 may be provided to be in close contact with each other. Accordingly, the harmful gas (G) and ions (I) moving upward from the lower side of the second flow path part 120 may both pass through the guide flow path 611 and move upward.

The second discharge electrode 620 may be provided inside the second ground electrode 610 to extend in the longitudinal direction of the second ground electrode 610 . The second discharge electrode 620 may be formed in a wire shape.

The second voltage applying unit 630 may apply a pulse voltage to the second discharge electrode 620 .

A positive (+) voltage may be applied to the second discharge electrode 620 from the second voltage applying unit 630 , and the second ground electrode 610 may be grounded. Alternatively, a negative (-) voltage may be applied to the second ground electrode 610 from the second voltage applying unit 630 . Through this, a pulse discharge may occur between the second ground electrode 610 and the second discharge electrode 620 .

By the pulse discharge, a reaction as shown in Equation (1) below may be induced to promote particle conversion.

Formula (1) --- SO ₂ +2NH ₃ +H ₂ O → (NH ₄ ) ₂ SO ₃ and SO ₂ +2NH ₃ +2H ₂ O → (NH ₄ ) ₂ SO ₃ H ₂ O

In addition, salt particles (SP) of a gaseous harmful substance included in the harmful gas (G) may be generated through such a collector conversion.

When the ions (I) generated by the ion generating unit 500 move to the salt particle generating unit 600 , ion induced nucleation may be induced in the pulse discharge. That is, condensation nuclei are required in order for water droplets to not be condensed, and salt particles (SP) can be better generated by ions (I) serving as condensation nuclei.

Meanwhile, the salt particle generating unit 600 may further have a housing 601 . The housing 601 may have a shape corresponding to the second flow path part 120 and may be formed of an electrically conductive material.

When the second flow path part 120 is formed of an insulating material, the housing 601 may be provided between the second flow path parts 120 , and the second ground electrode 610 is located inside the housing 601 . can be provided. Also, since the housing 601 is grounded, the second grounding electrode 610 may be grounded as well. Alternatively, a negative (-) voltage may be applied to the housing 601 from the second voltage applying unit 630 , and through this, a negative (-) voltage may be applied to the second ground electrode 610 as well. Through this, a pulse discharge may occur between the second ground electrode 610 and the second discharge electrode 620 .

Of course, the second flow path part 120 is formed of an electrically conductive material, and the second ground electrode 610 is provided in contact with the second flow path part 120 in a state where the configuration of the housing 601 is omitted. The second flow path unit 120 may be grounded, or a negative (-) voltage may be applied from the second voltage applying unit 630 to the second flow path unit 120 . However, when a negative (-) voltage is applied from the second voltage applying unit 630 to the second flow path unit 120 , there is a risk of a safety accident when the operator comes into contact with the second flow path unit 120 , and the second Since the voltage applied to the flow passage 120 can also be applied to the electric dust collector 700 , the second flow passage 120 is preferably formed of an insulating material.

The electrostatic precipitation unit 700 is provided at the rear end of the salt particle generating unit 600 in the flow path unit 100 , and may collect the salt particles SP. In this embodiment, the electrostatic precipitation unit 700 may be provided above the salt particle generating unit 600 .

4 is an exemplary view showing an electric dust collector of the harmful gas processing apparatus according to the first embodiment of the present invention.

4 , the electric dust collecting unit 700 may include a third ground electrode 710 , a third discharge electrode 720 , and a third voltage applying unit 730 .

The third ground electrode 710 may be vertically extended inside the flow passage 100 , specifically, the second flow passage 120 . The third ground electrode 710 may have a collection passage 725 in which the salt particles SP moving inward are collected. The collection passage 725 may be formed through the upper end and the lower end of the third ground electrode 710 . In addition, a plurality of third ground electrodes 710 may be provided along the cross-sectional direction of the second flow passage part 120 , and each of the third ground electrodes 710 adjacent thereto may be provided to be in close contact with each other. Accordingly, all of the salt particles SP moving upward from the lower side of the second flow passage 120 may pass through the collection passage 725 and move upward.

The third discharge electrode 720 may be provided inside the third ground electrode 710 to extend in the longitudinal direction of the third ground electrode 710 . The third discharge electrode 720 may be formed in a wire shape.

The third voltage applying unit 730 may apply a DC voltage to the third discharge electrode 720 .

A positive (+) voltage may be applied to the third discharge electrode 720 from the third voltage applying unit 730 , and the third ground electrode 710 may be grounded. Alternatively, a negative (-) voltage may be applied to the third ground electrode 710 from the third voltage applying unit 730 .

The salt particles SP moving through the collection passage 725 may be positively charged by the third discharge electrode 720 . Since the positive (+) charged salt particles (SP) generate a repulsive force that repels the positive (+) poles, the salt particles SP spread widely as they move upward. In addition, the positively charged salt particles SP may be effectively attached to the third grounding electrode 710 by attraction with the grounded third grounding electrode 710 . Since the salt particles SP move away from each other by the repulsive force, the salt particles SP may be thinly and widely collected by the third ground electrode 710 . In addition, the harmless gas (PG) in which the salt particles (SP) of the harmful substances are collected and removed may be discharged to the upper side.

The third discharge electrode 720 may further include a plurality of branch electrodes 721 extending in a direction perpendicular to the longitudinal direction inside the third ground electrode 710 . The branch electrode 721 may increase the charge rate of the salt particles SP by increasing the surface area of the third discharge electrode 720 .

Meanwhile, the electric dust collector 700 may further include an insulating pad 740 .

If the second flow path part 120 is formed of an electrically conductive material and the insulating pad 740 is omitted, the second flow path part 120 is grounded so that the third ground electrode 710 is also grounded. .

However, when a negative (-) voltage is applied from the third voltage applying unit 730 to the second flow path unit 120 , there is a risk of a safety accident when the operator comes into contact with the second flow path unit 120 , and the second A voltage applied to the flow path unit 120 may also be applied to the salt particle generation unit 600 . As described above, since a pulse voltage is applied to the salt particle generating unit 600 while a DC voltage is applied to the electric dust collecting unit 700, the salt particle generating unit 600 and the electric dust collecting unit 700 are electrically insulated from each other. It is preferable to be

The insulating pad 740 insulates the second flow path part 120 and the third ground electrode 710 so that even if the second flow path part 120 is formed of an electrically conductive material, the salt particle generator 600 and the electric dust collector 700 ) can be electrically isolated from each other. When the second flow path part 120 is formed of an insulating material, the insulating pad 740 may be omitted.

Since the insulating pad 740 may be provided on the inner circumferential surface of the second flow path part 120 , the flow path cross-sectional area of the insulating pad 740 may be smaller than the flow path cross-sectional area of the second flow path part 120 , which is the flow resistance. can act as Accordingly, an inclined inlet guide 741 may be formed at the lower end of the insulating pad 740 to reduce the flow resistance.

Meanwhile, the harmful gas treatment apparatus may include a washing water supply unit 900 , and the washing water supply unit 900 may have an accommodation tank 910 and a supply pump 920 .

1, 3 and 4, the receiving tank 910 may be provided below the salt particle generating unit 600 and the electric dust collecting unit 700, and the receiving tank 910 contains the washing water 901 ) can be accepted.

The supply pump 920 may supply the washing water 901 of the receiving tank 910 to the salt particle generating unit 600 and the electric dust collecting unit 700 . The receiving tank 910 and the supply pump 920 may be connected by a first connection pipe 931 , and the second ground electrode 610 of the supply pump 920 and the salt particle generating unit 600 is connected to a second connection. may be connected by a tube 932 . The washing water 901 supplied by the supply pump 920 is supplied to the upper portion of the second ground electrode 610 through the second connection pipe 932 , and flows down along the inner circumferential surface of the second ground electrode 610 . can

The salt particles SP generated by the pulse discharge in the salt particle generating unit 600 have high viscosity and may be attached to the inner circumferential surface of the second ground electrode 610 , and when the attached salt particles SP increase, the second The function of the ground electrode 610 may be deteriorated. The washing water 901 supplied through the second connection pipe 932 flows down while forming a water film on the inner circumferential surface of the guide passage 611 , and at this time, the salt particles SP are washed by the washing water 901 . As it exits, the surface of the guide passage 611 may be maintained in a clean state. In addition, the additive 201 remaining after the reaction may also be washed away by the washing water 901 .

In addition, the supply pump 920 and the third ground electrode 710 of the electric dust collector 700 may be connected by a third connection pipe 933 . The washing water 901 supplied by the supply pump 920 is supplied to the upper portion of the third ground electrode 710 through the third connection pipe 933 , and the collection passage 725 of the third ground electrode 710 . It can flow down along the inner periphery of

The salt particles (SP) collected on the surface of the third grounding electrode 710 in the electric dust collector 700 are supplied through the third connecting pipe 933 to form a water film on the inner peripheral surface of the third grounding electrode 710 while forming a water film below. It is washed out by the washing water (901) flowing down. Accordingly, the surface of the collection passage 725 may be maintained in a clean state.

Therefore, the washing water 901 accommodated in the receiving tank 910 flows downward while absorbing the salt particles (SP) in the electrostatic precipitation unit 700 and the washing water received therein, and the salt particles (SP) in the salt particle generating unit 600 . ) may be the washing water received by flowing downward while absorbing.

The washing water supply unit 900 is provided between the receiving tank 910 and the supply pump 920 to remove the salt particles SP absorbed in the washing water 901 moving through the first connection pipe 931 . It may have a filter 940 for Through this, the washing water containing the salt particles (SP) may be supplied to the salt particle generating unit 600 and the electrostatic precipitation unit 700 .

5 is a graph showing changes in water concentration and particle size according to humidity in the harmful gas processing apparatus according to the first embodiment of the present invention.

The experiment shown in FIG. 5 was carried out by using ammonia (NH ₃ ) as an additive, and supplying a pulse voltage of 10 kV to the salt particle generator.

Graph A1 shows the salt particles of _{sulfur dioxide (SO 2} ) contained in the harmful gas when the relative humidity is 40% by controlling the spraying part. And, graph A2 shows the salt particles _{of sulfur dioxide (SO 2} ) when the relative humidity is 80%.

Referring to FIG. 5 , it can be confirmed that the particles are grown into a 1㎛ class particulate material with a higher number concentration and a larger salt particle size at high humidity.

6 is a graph showing changes in water concentration and particle size according to the presence or absence of pulse discharge and ion generation processes in the harmful gas processing apparatus according to the first embodiment of the present invention.

The experiment shown in FIG. 6 was conducted with ammonia (NH ₃ ) as an additive, and at the same relative humidity.

Graph B1 shows the salt particles _{of sulfur dioxide (SO 2} ) when the subscript is in contact with sulfur dioxide (SO _{2 ) contained in the harmful gas. And, graph B2 shows salt particles of sulfur dioxide (SO 2} ) when pulse discharge is performed by supplying a pulse voltage of 10 kV to the salt particle generator in addition to the conditions of graph B1. And graph B3 shows the salt particles _{of sulfur dioxide (SO 2} ) when the ions are generated by supplying a voltage of 20 kV to the ion generating unit in addition to the conditions of the B2 graph.

Referring to FIG. 6 , it can be seen that when ions are implanted and pulsed discharge is performed, the particles have a higher concentration and the growth of particles in the 1 μm area is promoted.

7 is a graph showing the change in the concentration of the additive according to the presence or absence of moisture supply, ion generation, and additive preheating process in the harmful gas processing apparatus according to the first embodiment of the present invention.

The experiment shown in FIG. 7 was conducted using ammonia (NH ₃ ) as an additive.

Graph C1 is a graph in the case where moisture and ions are not supplied, and the additive is not preheated. Graph C2 is a graph when moisture and ions are not supplied and the additive is preheated to 60°C. Graph C3 is a graph when moisture and ions are supplied and the additive is also preheated to 60°C.

Referring to FIG. 7 , it can be seen that the concentration ratio of _{ammonia (NH 3} )/sulfur dioxide (SO ₂ ) is the smallest when moisture and ions are supplied and the additive is preheated. That is, when moisture and ions are supplied and the additive is preheated, the ammonia input concentration is reduced to reduce the ammonia slip problem, which is a phenomenon in which only a part of the supplied ammonia interacts with the harmful gas and the unacted ammonia is discharged.

8 is an exemplary view showing a harmful gas processing apparatus according to a second embodiment of the present invention. In this embodiment, the shape of the flow path part and the positional relationship of each component may be different according to it, and other contents are the same as in the first embodiment described above. Therefore, the same numbers are assigned to the same components, and repeated contents are omitted as much as possible.

As shown in FIG. 8 , in the present embodiment, the first flow path part 1110 of the flow path part 1100 may be formed in a vertical direction, and the second flow path part 1120 is a lower portion of the first flow path part 1110 . It may be connected to and formed in a horizontal direction.

In addition, the harmful gas (G) may be introduced into the upper portion of the first flow path part 1110 and move downward, and then may be moved in the horizontal direction through the second flow path part 1120 .

Accordingly, the additive supply unit 200 , the spray unit 300 , and the heating unit 800 are provided on the upper portion of the first flow path unit 110 , and the mixing induction unit 400 in the downward direction of the first flow path unit 110 , An ion generating unit 500 , a salt particle generating unit 600 , an electrostatic precipitation unit 700 , and a receiving tank 910 may be located.

According to this embodiment, the size of the horizontal space occupied by the harmful gas processing apparatus may be smaller than in the first embodiment described above.

Hereinafter, a harmful gas treatment method will be described.

9 is a flowchart illustrating a harmful gas treatment method according to a first embodiment of the present invention.

9, the harmful gas treatment method is an additive supply step (S2100), a spray step (S2200), a mixing induction step (S2400), an ion generation step (S2500), a salt particle generation step (S2600) and an electrostatic precipitation step (S2700) may be included.

The additive supply step ( S2100 ) may be a step of supplying the additive to the inside of the flow passage so as to be in contact with the harmful gas moving inside the flow passage. When the additive is supplied, the contact between the harmful gas and hydrogen can be further promoted, and the mixing effect with the harmful gas can be improved.

The harmful gas treatment method may include a heating step (S2300) of increasing the temperature of the additive before it is introduced into the flow passage. The preheated additive may have a higher diffusivity, which may increase the mixing effect with harmful gases.

The spraying step (S2200) may be a step of spraying water on the inside of the flow path to be mixed with the harmful gas. The moisture supplied to the flow passage may be mixed with the harmful gas to help increase the reaction effect to proceed later.

The process of heating and supplying the additive to the flow passage through which the harmful gas moves and supplying moisture may be performed simultaneously, rather than sequentially.

The mixing induction step (S2400) may induce the contact of the harmful gas and the additive and the mixing of the harmful gas and the sprayed water.

The ion generation step ( S2500 ) may be a step of generating ions by generating a corona discharge. In addition, the salt particle generation step (S2600) may be a step of generating a pulse discharge to mix the harmful gas and ions to generate the salt particles of the harmful gas.

In the electrostatic precipitation step (S2700), salt particles may be electrocollected.

According to the present invention, since harmful particles in the gas phase included in the harmful gas can be generated as salt particles and electrostatically collected, the dust collection efficiency can be increased. That is, dust collection may be easier and more effective when the harmful particles are in the gaseous state than in the gaseous state. In the present invention, since the harmful particles are generated and collected as salt particles, the processing efficiency of the harmful gas can be increased.

In particular, by preheating the supplied additive and supplying moisture and ions, it is possible to increase the size of the produced salt particles and promote the growth of the salt particles, thereby increasing dust collection efficiency. In addition, the concentration of the additive can be reduced, and the problem of ammonia slip can be reduced.

The above description of the present invention is for illustration, and those of ordinary skill in the art 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 embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise 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 changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

100,1100: Euro
200: additive supply unit
300: spray unit
400: mixing induction unit
500: ion generating unit
600: salt particle generation unit
700: electric dust collector
800: heating unit
900: washing water supply unit

Claims (8)

an additive supply unit for supplying additives to the inside of the flow path so as to be in contact with the harmful gas moving inside the flow path;
a spraying unit for spraying water inside the flow path to be mixed with the harmful gas;
a mixing inducing unit provided at the rear end of the additive supply unit and the spraying unit in the flow path and inducing contact between the harmful gas and the additive and mixing of the harmful gas and the sprayed water;
an ion generating unit provided at a rear end of the mixing induction unit in the flow path unit to generate ions by generating a corona discharge;
a salt particle generating unit provided at a rear end of the ion generating unit in the flow path and generating a pulse discharge so that the noxious gas and the ions are mixed to generate salt particles of the noxious gas; And
Noxious gas treatment apparatus, which is provided at a rear end of the salt particle generating unit in the flow path, and includes an electric dust collector for collecting the salt particles. According to claim 1,
and a heating part provided between the flow path part and the additive supply part and increasing the temperature of the additive supplied from the additive supply part. According to claim 1,
The ion generating unit
a plurality of first grounding electrodes extending in the longitudinal direction of the flow passage inside the flow passage and having a hollow tube shape;
a first discharge electrode extending in the longitudinal direction of the first grounding electrode inside the first grounding electrode;
Harmful gas processing apparatus, characterized in that it has a first voltage applying unit for applying a voltage to the first discharge electrode. According to claim 1,
a storage tank provided under the salt particle generating unit and the electrostatic precipitation unit, the washing water being accommodated;
and a washing water supply unit having a supply pump for supplying the washing water of the receiving tank to the salt particle generating unit and the electric dust collecting unit,
The washing water accommodated in the accommodating tank is a hazardous gas treatment apparatus, characterized in that the washing water flows downward while absorbing the salt particles in the electrostatic precipitator. 5. The method of claim 4,
The salt particle generating unit
a plurality of second ground electrodes extending vertically inside the flow passage and having guide passages inside for guiding the movement of the harmful gas and the ions;
a second discharge electrode extending in the longitudinal direction of the second ground electrode inside the second ground electrode;
and a second voltage applying unit for applying a pulse voltage to the second discharge electrode;
The washing water supplied by the washing water supply unit flows along the inner circumferential surface of the guide passage. 5. The method of claim 4,
The electric dust collector
a plurality of third ground electrodes extending vertically inside the flow passage and having a collection passage in which the salt particles moving inward are collected;
a third discharge electrode extending in the longitudinal direction of the third ground electrode inside the third ground electrode;
and a third voltage applying unit for applying a voltage to the third discharge electrode,
The washing water supplied by the washing water supply unit flows along the inner circumferential surface of the collection passage. an additive supply step of supplying an additive to the inside of the flow passage so as to be in contact with the harmful gas moving inside the flow passage;
a spraying step of spraying water inside the flow path to be mixed with the harmful gas;
a mixing induction step of inducing contact between the harmful gas and the additive and mixing of the noxious gas and the sprayed water;
An ion generating step of generating ions by causing a corona discharge;
a salt particle generation step of generating salt particles of the noxious gas by mixing the noxious gas and the ions by generating a pulse discharge; And
Harmful gas treatment method comprising the electrostatic precipitation step of collecting the salt particles electrically. 8. The method of claim 7,
Noxious gas treatment method comprising a heating step of increasing the temperature of the additive before it is introduced into the flow passage.

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