KR20020000659A - Apparatus for purifying harmful gas in a reactor using streamer corona discharge driven by high voltage impulse power supply - Google Patents

Abstract

The present invention causes a streamer corona discharge in a special electric field to discharge harmful gases emitted from an industrial facility, so that gases containing dioxins, furans and similar compounds as well as sulfur oxides (SOx), nitrogen oxides (NOx) and organic compounds are produced. It relates to a device for purification. The device according to the invention comprises a reactor (1) consisting of a hopper (19) in which the first stage (4) and the second stage (5) are connected in series and for collecting dust collection material, and the hazardous discharges from industrial facilities. A high voltage impulse for generating plasma using an inlet duct 2 for introducing gas, an outlet duct 3 for discharging the purified gas, and a streamer corona discharge that is energized in the first stage 4 of the reactor 1. A high voltage pulse generator (P _G ) having an impulse frequency characteristic for generating and supplying a high voltage, a high voltage pulse generator controller (C ₁ ) for controlling pulse power supplied to the first stage (4) of the reactor (1); Two high voltage power supplies (P1, P2) for supplying a high voltage to the first stage (4) of the reactor (1) through the high voltage pulse generator (P _G ) to generate a high voltage impulse, Another high voltage power supply P3 for supplying a high voltage to the second stage 5, and The high voltage power supply (P1, P2, P3) for controlling the high voltage control device (C2).

Description

Apparatus for purifying harmful gas in a reactor using streamer corona discharge driven by high voltage impulse power supply}

The present invention relates to a gas purifying apparatus for removing noxious gases emitted from various industrial facilities. In particular, the harmful gases emitted from industrial facilities cause streamer corona discharge in a special reactor to form sulfides (SOx) and nitrogen oxides ( NOx) and complex organic compounds as well as devices for purifying gases containing dioxins, furans and similar compounds thereof.

In order to treat harmful substances emitted from industrial facilities that cause serious pollution problems in recent years, a dust collector, a sulfur oxide (SOx) treatment device, a nitrogen oxide (NOx) treatment device, a volatile organic compound (VOC) treatment device, and a dioxin or furan, etc. Similar devices for treating hazardous materials are used, and these devices are composed of separate devices and purify the hazardous materials by various treatment methods.

11 shows a general configuration of a treatment apparatus for removing harmful substances discharged from a conventional industrial facility.

The treatment apparatus includes a nitrogen oxide treatment apparatus (A), an organic compound treatment apparatus (B) such as volatile organic compounds and dioxins, a dust collector (C), and a sulfur oxide treatment apparatus (D). Each of these devices is individually installed, and the harmful substances discharged to various industrial facilities are purified in various stages and discharged through the chimney F to prevent environmental pollution.

The prior art described above treats hazardous substances selectively using treatment methods such as dry, semi-dry, and wet, and chemicals, and the arrangement and configuration of the devices are different because the operating conditions are different according to each device and treatment method. Therefore, the process of cooling or heating the discharged gas is required, and additionally, complicated special equipment for supplying a cooling device, a pre-heater, and a chemical is required. In addition, due to the problem of using chemicals, etc. in the process of purifying the toxic substances, the purified product generates a secondary pollutant has a problem that requires a separate waste water treatment device or waste treatment device.

In particular, in the conventional technology, since the apparatus for removing harmful substances is configured and operated as separate independent apparatuses, there is a problem that the facilities are excessive and large in size, and each hazardous substance treatment apparatus as described above. Due to the different operating conditions, the necessary auxiliary equipment, expensive catalyst materials such as chemicals or neutralizing agents must be used, and wastewater treatment equipment for treating the secondary products generated inevitably. There is a problem in that the installation cost and operating cost is high.

Further, in the conventional technology, since the catalysts such as chemicals used in the chemical treatment method for each hazardous substance to be treated are different from each other, according to the hazardous substances to be treated as shown in FIG. In the process of installing a process or device, a complex arrangement must be determined according to the process to be processed because the device in front affects the device in the back.

In addition, examples of technologies directly related to the present invention include plasma harmful gas treatment technology using an electron-beam and harmful gas treatment technology using pulse corona discharge. First of all, the well-known harmful gas treatment technology using electron beam has been attempted mainly in some developed countries. In this technology, a device that generates an electron beam is expensive and difficult to be applied to an actual industry. In the process of generating an electron beam, radiation is emitted, which requires a separate device that must be protected from the danger. As a result, in the method using the electron beam, it is difficult to construct a gas purifier in the basement through a special design, and it is not economical because its installation and manufacturing cost is high.

In addition, in the gas purifier using pulse corona, it is difficult to form a stable pulse high voltage in a method of generating sharp high voltage impulse which is effective in pulse discharge, and it is not economical because of low efficiency, and generates effective streamer corona discharge. In the structure of a reactor which is essential for forming a special electric field for the purpose, a circular circular discharger, generally a circular discharger, is not able to form sufficient streamer corona at the end of the discharge forming portion due to the radial discharge, It is not efficient because there is a loss area of the energy supplied because the empty space of the reaction part is formed. In addition, there is generally a problem that it is difficult to form a constant electric density for generating a strong streamer corona throughout the reactor.

Therefore, the present invention uses a plasma generated by the streamer corona discharge in a special electric field to solve the conventional problems as described above, harmful gases such as sulfur oxides (SOx), nitrogen oxides (NOx) and dioxin, furan, etc. An object of the present invention is to provide a method and apparatus for treating air pollutants, which can simultaneously treat harmful substances and organic compounds such as volatile organic compounds (VOCs).

In order to achieve the above object, according to the present invention, in the harmful gas purification method for purifying the harmful gas by entering the reactor through the inlet duct and discharge the purified gas through the outlet duct, the high voltage supplied from the high voltage power supply device Converting the high voltage impulse into a characteristic and feeding the reactor; A reaction step of removing the noxious gas through a physical chemical reaction by radicals generated by the plasma generated by the streamer corona discharge in the first stage of the reactor by the supplied high voltage impulse; An integration step of collecting and accumulating the reaction product obtained in the reaction step by using an electric field in the second stage of the reactor; There is provided a gas purification method comprising a discharge step of collecting and discharging the reaction products accumulated in the accumulation step.

In addition, according to the present invention, in the gas purifying apparatus for purifying harmful gas containing various harmful substances discharged from an industrial facility, a high voltage power supply for supplying a high voltage in order to generate a high voltage impulse, and is supplied from the high voltage power supply A high voltage impulse generator converting a high voltage into a high voltage having an adjustable base voltage and a frequency operating characteristic, and a high voltage impulse having an adjustable frequency characteristic supplied from the high voltage impulse generator, and generating a plasma through a streamer corona discharge to generate a noxious gas. A reactor comprising a first stage for removing the reaction through a physicochemical reaction, an electrostatic precipitator for accumulating the reaction product generated by the harmful gas removed from the reactor first stage, and the reactor in the second stage. Do not collect and release the reaction product. The gas purification system is provided consisting of a hopper.

In particular, in the embodiment of the present invention, a plurality of flat plate collecting electrodes (Collecting Electrode) provided with a cooling means in the first stage of the reactor is installed in parallel, between 1 to ⁵ per 1 m ^{3 of} harmful gas flow rate to be purified between them It characterized in that the tooth-shaped discharge electrode (Discharge Electrode) having two teeth.

In addition, a plurality of planar dust collecting electrodes which are not cooled are provided in parallel in the second stage of the reactor, and discharge electrodes having a saw-toothed plate shape are provided between them. In this case, the number of collecting electrodes should be at least two and the number of discharge electrodes should be at least one.

In the first stage of the reactor, when the impulse high voltage supplied from the high voltage pulse generator is supplied between the discharge electrode and the dust collecting electrode, the streamer corona in the special electric field is generated from the sawtooth discharge electrode and the harmful gas flows into the reactor through the inlet duct. Reach to the plasma state formed by the streamer corona to decompose harmful gases to form a reactive reactive radicals to induce an electrochemical reaction to purify the harmful gases.

In the second stage of the reactor, by-products generated from the noxious gas purified in the first stage are integrated into the dust collecting electrode due to the electric field of the electrostatic precipitator structure, thereby eventually purifying the noxious gas in the reactor. The purified gas is discharged through the chimney through the outlet duct of the reactor, and by-products of the purified material accumulated in the collecting electrode are collected in the hopper and discharged through the product discharge pipe to treat all the harmful gases generated from the industrial facilities. It becomes possible.

1 is a schematic diagram showing the system configuration of the harmful gas purifying apparatus of the present invention.

Figure 2 is a partial cutaway front view showing the reactor body of the harmful gas purification apparatus according to the present invention.

Figure 3 is a longitudinal sectional view showing the inside of the reactor body of Figure 2;

4 is a side view of FIG. 3;

FIG. 5 is a front view of the first stage discharge electrode installed in the reactor body of FIG. 2; FIG.

FIG. 6 is a front view of a second stage discharge electrode installed in the reactor body of FIG. 2; FIG.

7 is a front view of the first stage dust collecting electrode installed in the reactor body of FIG.

8 is a front view of a second stage dust collecting electrode installed inside the reactor body of FIG. 2;

Figure 9a is a waveform diagram of the discharge voltage characteristic of the reactor first stage 2;

Figure 9b is an impulse voltage and current waveform applied to the discharge electrode of the reactor of Figure 2;

Figure 10 is a photograph showing a streamer corona discharge state showing the electrical discharge characteristics inside the harmful gas purification apparatus of the present invention.

11 is a view for explaining the treatment process of the conventional harmful gas treatment device.

* Explanation of symbols for main parts of the drawings

1: Reactor Body 2: Inlet Duct

3: outlet duct 4: reactor 1st stage

5: Reactor 2nd stage 6: Discharge electrode DE of 1st stage

7: dust collecting electrode CE of first stage 8: discharge electrode DE of second stage

9: dust collecting electrode of second stage 10: discharge electrode hanger support

11: discharge electrode hanger frame 12: insulation support

13: insulated support protective box 14: insulated support

15, 25: discharge electrode set frame 16: coolant connection pipe

17 gas distribution unit 18 gas induction furnace

19: Hopper 20: product outlet

21: product discharge pipe 22: injection nozzle

23: water supply pipe 24: water supply header

26, 28: discharge electrode holder 27, 29: discharge electrode holder

30: ground electrode frame 31: cooling water inlet and outlet

C ₁ , C ₂ : controller P ₁ , P ₂ , P ₃ : high voltage power supply

P _G : High Voltage Pulse Generator

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

1 is a simplified diagram showing the overall configuration of the gas purifying apparatus of the present invention, the control apparatus (C ₁ , C ₂ ), high voltage power supply (P ₁ , P ₂ , P ₃ ), high voltage pulse generator (P _G ), Reactor body 1 composed of the first stage (4) and second stage (5), gas inlet duct (2), outlet duct (3), the control device (C ₁ , C ₂ ) is a separate Installed in the room or control room (Control Room) and controlled by the microprocessor or computer to control the operation of the high voltage power supply (P ₁ , P ₂ , P ₃ ) and high voltage pulse generator (P _G ) is optimal in the reactor (1) Will cause the streamer corona discharge.

A description of the high voltage power supply (P1, P _2, P ₃₎ and a high-voltage pulse generator (P _G), the detailed construction and the reactor (1) a streamer corona discharge phenomenon of the gas in the filed by the present applicant that date "high voltage Discharging device in impulse using gas "," high-voltage impulse discharger (trial-gap switch) of three-pole electrode characteristics with an adjustable control electrode "are described in detail in the patent application specification here, with reference to the contents Detailed description will be omitted.

Briefly describing the high voltage power supply (P ₁ , P ₂ , P ₃ ) and high voltage pulse generator (P _G ), the high voltage power supply (P ₁ , P ₂ , P ₃ ) for controlling the DC or AC voltage A voltage controller, a high voltage transformer for boosting an AC voltage, a high voltage rectifier for converting the boosted AC voltage to a DC high voltage, a high voltage detector for detecting an output DC voltage and a current to control an output DC high voltage, and a DC high voltage Consists of a condenser to remove and store the ripple and simultaneously act as a filter.

The high voltage pulse generator (P _G ) is a high-voltage impulse discharge (Spark-gap Switch) of the three-pole electrode structure having an adjustable control electrode, and an iron core (Core) for amplifying without a loss the impulse high voltage generated by using the discharge ) By an impulse control circuit including an airless Tesla transformer, an impulse charging capacitor and an inductance coil used for resonance charging and discharging to generate high voltage impulses, and a high voltage power supply (P ₂ ). A filter provided for synthesizing the impulse and the DC high voltage in order to use the supplied DC high voltage as a base voltage for discharge formation, an impedance matching circuit for impedance matching according to the load variation on the output high voltage impulse; Consists of a separate control device (C ₁ ) for controlling the operation in connection with the high voltage power supply (P ₁ , P ₂ , P ₃ ) do.

The first stage 4 of the reactor receives an impulse high voltage having adjustable base voltage and frequency characteristics from a high voltage impulse generator P _G and is installed to generate a plasma chemical reaction by a powerful streamer corona through the formation of discharge in gas. As described in detail below with reference to the drawings, a plurality of plate-shaped first stage collecting electrodes (CE; 7) installed in parallel along the longitudinal direction of the reactor body 1 and having a cooling function And a serrated discharge electrode (DE) 6 disposed between the first stage dust collecting electrodes 7.

In addition, the second stage 5 of the reactor communicating with the lower portion of the reactor first stage 4 for accumulating and removing the product generated through the plasma chemistry reaction is installed in parallel with the second plate dust collecting electrode 9 And a discharge electrode 8 having a toothless plate shape provided between the second stage dust collecting electrodes 9, an inlet duct 2 for introducing a gas to be treated, and an outlet duct for discharging the purified gas. 3) and hopper 19.

Thus, the high voltage power supply _{(P 1, P 2, P} 3) High-voltage pulse generator (P _G) to a high voltage supplied from the supplying high-voltage and high-voltage power supply device _{(P 1, P 2, P} 3) using Generates a high voltage impulse having an adjustable base voltage and frequency characteristics, and supplies it to the reactor 1, and receives an impulse high voltage from the high voltage pulse generator P _G and discharge electrode ( 6) and the streamer corona is generated in the gas by the impulse high voltage between the dust collecting electrode (7) to purify by reacting the harmful gas flowing into the reactor (1) through the inlet duct through the plasma electrochemical reaction, The reaction product is collected by the second stage 5 of the reactor and collected in the hopper 19 to be discharged through the product discharge pipe 21, and only the purified gas is discharged to the chimney through the outlet duct 3 to purify the harmful gas. Is achieved.

In the reactor 1, the number of the collecting electrodes 7 and 9 should be at least two and the number of the discharge electrodes 6 and 8 should be at least one for each stage. In the first stage 4 of the reactor, when the impulse high voltage supplied from the high voltage pulse generator P _G is supplied between the discharge electrode 6 and the dust collecting electrode 7, the discharge of the toothed discharge electrode 6 in the special electric field is generated. Trimmer corona is generated and the harmful gas introduced into the reactor 1 through the inlet duct 3 is decomposed in the physicochemical plasma state formed by the streamer corona to form highly reactive radicals to induce electrochemical reactions. The gas is purified, and in the second stage 5, by-products generated from the harmful gas purified in the first stage 4 are integrated into the dust collecting electrode 9 due to the electric field of the electrostatic precipitator structure. Will purify.

The purified gas is discharged through the chimney through the outlet duct 3 of the reactor 1 and purifies the harmful gas accumulated in the dust collecting electrodes 7 and 9 of the first stage 4 and the second stage 5. By collecting the by-products of a material in the hopper 19, it is possible to efficiently handle various harmful gases discharged from the industrial facilities at the same time.

2 to 4 show the internal structure of the reactor 1 of the harmful gas purifying apparatus according to the present invention.

The reactor 1 has a structure in the form of an electrostatic precipitator having a collecting plate 7 and 9 of a parallel plate, in which two stages of a rectangular cross section are connected in series. Based on the structure of the reactor (1), reactors having such a structure can be arranged in series or in parallel, and can be applied horizontally or vertically even in a two-stage arrangement. However, when arranged horizontally, there is a region where the streamer corona discharge region cannot be formed in the upper and lower portions of the reactor 1 depending on the characteristics of the reactor structure that must maintain high voltage insulation. It is more effective to vertically arrange in order to minimize the proportion of the regions that cannot cause the reaction and do not cause the reaction with respect to the entire treatment region. However, in the case where the flow rate of the gas containing the harmful gas to be treated is large, the cross-sectional area of the reactor is increased in proportion to the treatment flow rate so that even in the case of arranging in parallel, a dead zone cannot cause a reaction between the top and the bottom. Since may be neglected, depending on the mechanical structure, the construction may be arranged in parallel, which is advantageous in construction.

In the above configuration, the first stage 4 of the reactor is arranged in parallel with the electrically grounding collecting electrode 7 having an electrically cathode characteristic of the parallel plate shape which can be cooled in parallel. The discharge electrodes 6 having serrated electrically anode characteristics are disposed between the dust collecting electrodes 4 arranged in parallel to each other by the discharge electrode fixing frame 27. A discharge electrode 6 composed of a tooth plate having 1 to 5 teeth per cubic meter (m ³ ) is provided.

This configuration of the reactor first stage 4 uses the high voltage supplied from the high voltage power supplies P ₁ and P ₂ to convert the high voltage of the high voltage power supply P ₂ into the discharge electrodes of the reactor first stage 4. The high voltage supplied from the high voltage power supply device P1 is applied between the 6) and the dust collecting electrode 7 as the base voltage of the discharge excitation state, and the high voltage of the impulse type having the frequency characteristics is applied using the high voltage pulse generator PG. By superimposing at a low voltage, a strong streamer corona discharge is formed between the discharge electrode 6 and the dust collecting electrode 7 of the first stage 4 of the discharger, and the physicochemical reaction of the gas to be introduced into the reactor 1 by plasma is performed. It is characterized by causing the.

In this process, the serrated discharge electrode 6 is effective to chemically react in the entire region of the reactor 1 only when the streamer corona generated at each tooth end portion is uniformly distributed throughout the reactor first stage 4. Can cause. Therefore, in order to obtain an effective purification efficiency without loss of energy due to the distribution of streamer corona evenly distributed throughout the reactor, the number of teeth of the discharge electrode 6 has an important correlation to generate the streamer corona according to the amount of gas to be treated. . This is substantially related to the flow rate of the gas flowing inside the reactor 1 and considering the reaction time, the discharge electrode 6 of the reactor first stage 4 per cubic meter (m ³ ) of the gas to be treated. It is characterized by having 1-5 teeth.

In the second stage 5 of the reactor, planar dust collecting electrodes 9 which are not cooled are arranged in parallel, and discharge electrodes 8 having a sawless plate shape are provided between the dust collecting electrodes 9. At this time, the plate-shaped discharge electrode 8 may have another structure, such as a wire. This configuration is possible because it is used by the same principle as the electrostatic precipitator.

In addition, the second stage 4 of the reactor receives a high voltage from the high voltage power supply P3, electrically applies the negative voltage to the discharge electrode 8 to the cathode (Cathode Electrode), and the dust collecting electrode 9 Dust particles and gases contained in aerosols and gases formed through chemical reactions in the first stage 4 in the second stage 5 through electrical connection using ground as the cathode electrode. And other condensed particles are charged by the negative ion (Negative Discharge) between the discharge electrode (8) and the dust collection electrode (9) by an electric field of a uniform distribution to charge the particles with negative ions to accumulate in the dust collection electrode (9) It is characterized by having a configuration of.

Therefore, in the harmful gas purifying apparatus of the present invention, the streamer corona discharge is generated by a high voltage having an adjustable base voltage and an impulse frequency characteristic supplied from the reactor first stage 4 through the high voltage pulse generator PG. Heterogeneous reactions of plasma phase change reactions allow sulfur oxides (SOx), nitrogen oxides (NOx), and complex organic compounds to react and combine with water contained in the gas through oxidation or decomposition reactions. Conversion into aerosol form and particles results in a material that is readily integrated in the second stage 5 of the reactor having an electrostatic precipitator structure.

As described above, the material converted in the first stage 4 of the reactor is collected in the second stage 5 of the dust collecting electrode 9 by an electric field caused by electric discharge between the discharge electrode 7 and the dust collecting electrode 9 by the direct current high voltage. ), Flows down into the hopper 19 in a continuous thin film form and is discharged out of the purification apparatus through the product outlet 20 to be accumulated in a separate container, and the purified gas is discharged through the outlet duct 3.

Detailed configurations of the discharge electrode and the dust collecting electrode installed inside the reactor body 1 are shown in FIGS. 5 to 8.

Referring to FIG. 5, the discharge electrode 6 of the first stage of the reactor includes a discharge electrode 6 having a serrated plate, a discharge electrode holder 26 for fixing the discharge electrodes 6 in a constant arrangement; The discharge electrode fixing frame 27 for forming the discharge electrodes 6 fixed by the discharge electrode holder 26 into one set, and the discharge electrode fixing frames 27 formed of the set of the discharge electrodes 6 are all harmful gases. It consists of a discharge electrode set frame 15 for assembling into one component of the purification device.

The discharge electrode 8 of the second stage 5 of the reactor is similar to the configuration of the discharge electrodes 6 of the first stage of the reactor as shown in FIG. The discharge electrode 8, the discharge electrode fixing frame 28, the discharge electrode fixing frame 29, and the discharge electrode set frame 25 are arranged.

In addition, the dust collecting electrode 7 of the first stage 4 of the reactor has a flat rectangular cylindrical dust collecting electrode 7 having a water circulation passage through which cooling water can flow, and the reaction body 1 as shown in FIG. 7. A dust collecting electrode frame 30 for arranging and fixing the dust collecting electrodes at regular intervals, and a cooling water inlet / outlet 31 for flowing the cooling water into the dust collecting electrode 7.

In addition, the collecting electrode 9 of the second stage 5 of the reactor is composed of a flat plate which is not cooled as shown in FIG. 8.

3 and 4, the reactor body 1 of the harmful gas purifying apparatus according to the present invention to distribute the gas flowing into the reactor body 1 through the inlet duct 2 evenly distributed throughout the reactor. A gas distribution unit 17 for discharging, a gas induction path 18 for inducing discharge of purified gas, and a discharge electrode hanger for suspending and supporting the discharge electrodes 6 and 8 of the first and second stages. A discharge electrode hanger frame 11 for hanging and fixing the support electrodes 10, the discharge electrodes 6 and 8 disposed at each end of the reactor through the discharge electrode hanger supports 10, and the discharge electrode hanger frame An insulating support 12 for installing the discharge electrodes 6 and 8 through the high voltage insulation from the reaction body 1 to supply the high voltages to the discharge electrodes 6 and 8 in the reactor through 11; To protect the insulation support consisting of the high voltage insulator and Insulation support protection box 13 having a sealed box structure for safety against voltage, insulation support check 14 provided for the safety check of the insulation support 12, and dust collection of the first stage 4 of the reactor Cooling water connecting pipe (16) for supplying cooling water to the electrode (7), a spray nozzle (22) installed for cleaning inside the reactor, and a water supply pipe (23) for supplying water to the spray nozzles (22) And a water supply header 24 for maintaining and adjusting an appropriate amount of cooling water and water to be supplied, and a product discharge pipe 21 for discharging the product accumulated in the hopper 19 to the outside through the discharge port 20. do.

Hereinafter, the operation of the above-described harmful purifying apparatus will be described in detail.

9A is a graph showing the characteristics of the discharge voltage supplied to the first stage 4 of the reactor. In addition, the impulse voltage and the current curve applied to the discharge electrode of the reactor are shown in the waveform diagram of FIG.

The total number of teeth of the discharge electrode 6 of the first stage 4 of the reactor requires 1 to 5 streamer corona discharge points per volume of 1 cubic meter of gas flow rate depending on the components of the gas to be purified. This is closely related to the passage speed and reaction time of the gas in the reactor which is determined by the cross-sectional area of the gas passing through the reactor for purifying the noxious gas and the gas flow rate to be purified. It is also conceived that streamer corona should be evenly distributed throughout the reactor. If the streamer corona discharge points are located too far relative to one discharge point, the gases passing between the discharge points cannot be efficiently reacted because they do not receive enough electrical energy from the streamer corona. Is caused. Therefore, the distribution of the streamer corona discharge point for delivering energy to the entire gas passing through the reactor is important according to the gas flow rate to be purified.

In addition, the cooling dust collecting electrodes 7 of the first stage 4 of the reactor are used to prevent deterioration of the electrodes and the energy transmitted by the streamer corona for the purpose of preventing wear due to the deterioration of the electrodes by the powerful streamer corona discharge. It is delivered to the molecule to prevent the consumption of energy due to the rise of the temperature of the gas, and to induce it to act only on the ions of the gas molecules to increase the reaction efficiency through the generation of radicals by the plasma to be used only in the reaction, while the dust is cooled Induces condensate through energy exchange with gas passing through the reactor on the surface of electrode 7 to promote heterogeneous reaction and total plasma phase change reaction with moisture in gas The reaction product is removed by forming a film on the surfaces of the dust collecting electrodes 7.

In Figure 10, it can be seen the discharge state of the streamer corona showing the electrical discharge characteristics inside the harmful gas purifying apparatus according to the present invention.

Complex organics, including compounds such as dioxins, furans, and volatile organic compounds, purge gases containing vapor water, sulfur oxides (SOx), nitrogen oxides (NOx), and other constituents may contain inlet ducts (2). The corona discharge region in the electric field by flowing into the reaction body 1 through the plasma region in the electric field formed by the streamer corona discharge of the reactor first stage 4 and by the direct current high voltage of the second stage 5 of the reactor. Purified as it passes through the outlet duct (3).

In this series of processes, sulfur oxides and nitrogen oxides are oxidized to the acid and other hydrate levels under the action of streamer corona discharge in the region of the first stage 4 of the reactor, and complex organic compounds are momentarily induced by strong streamer corona. Receiving electrical energy, organic decomposition proceeds as a relatively simple compound. Thus, the aerosol-shaped fine particles formed by the reaction of the reactor first stage (4) and the simple substance are introduced into the reactor second stage (5) together with the gas, the reactor second stage having a member of the electrostatic precipitator ( Particles are charged and electrically charged by corona discharge using high voltage direct current in the region of 5), and a direct current is applied between the discharge electrodes 8 and the dust collecting electrodes 9 of the second stage 5 of the reactor. Particles, dust, gas and other condensed particles, such as aerosols, are accumulated in the dust collecting electrode 9 by the electric field formed by the electric field, and through the purification of the continuous gas into the hopper 19 in the form of a thin film on the surface of the dust collecting electrodes 9. Through the product outlet 20, the product is discharged into a special product discharge pipe 21 in which gas leakage is prevented and collected in a separate container for disposal.

In addition, in the reactor stage 1 consisting of two stages connected in series, a strong streamer corona discharge first converts sulfur oxides, nitrogen oxides into acids and other hydrates, and organic compounds into simple compounds. In the second stage (5), these aerosol-type conversion products are recovered so that the process of ultimately purifying and discharging the gas can be continuously processed. Separate additives may be used for the purpose of further promoting the reaction of the reactor first stage 4 or for converting it into specific substances such as oil and draft. However, depending on the efficiency of the gas purification and the purpose of recovery of the reaction product according to the use of additives, the purification conditions of the harmful gas can be set in consideration of economic aspects. Even without using such a separate additive, sulfur oxides and nitrogen oxides may be recovered as an acid or a hydrate using moisture contained in the gas, and may be recycled.

In the discharge electrode 6 of the gas purifying apparatus of the present invention, the number of teeth is set to 1 to 5 when the number of teeth is 1 or less per cubic meter of purification gas, so that the strength of the streamer corona discharge in the reactor is lowered and the purification efficiency is lowered. In the case where the number of teeth is 5 or more, 1 to 5 per cubic meter of gas to be purified is preferable because the discharge power is increased to bring unnecessary energy consumption.

In addition, in the arrangement of the discharge electrodes 6 and 8 and the dust collection electrodes 7 and 9, the area of the dust collection electrodes 7 and 9 is increased in such a manner as to increase the conduction voltage reaching the spark or the arc due to insulation breakdown. Compared with the set frame of the discharge electrodes 6 and 8, the conduction voltage at the end of the electrode is increased by the same value as the distance between the two electrodes between the discharge electrodes 6 and 8 and the relative dust collecting electrodes 7 and 9. It is possible to increase the consumption of the electrode material.

As described above, the present invention provides a gas purifier that can simultaneously and simultaneously process sulfur oxides (SOx), nitrogen oxides (NOx), and complex organic compounds in a gas purification apparatus discharged from various industrial facilities. By providing a comprehensive level of gas treatment, reducing energy consumption, and significantly reducing the size of the device, the installation space is reduced, and the manufacturing and operation are simple, so it is economically effective.

In addition, the hazardous gas can be recovered as an acid or a hydrate without additional additives, and can be recycled. It can also be recovered as another substance using an additive.

In particular, the device proposed in the present invention is a gas purifying apparatus capable of simultaneously treating sulfur oxides and nitrogen oxides emitted from various industrial boilers, and can purify various harmful gases emitted from incinerators, smelting plants, chemical plants, and power plants. have.

Claims (10)

A device for purifying gases containing dioxins, furans and similar compounds as well as sulfur oxides (SOx), nitrogen oxides (NOx) and organic compounds by causing the streamer corona discharge in a special electric field from harmful gases emitted from industrial facilities To Reactor main body 1 having a rectangular cross section including an inlet duct 2 for introducing harmful gas and an outlet duct 3 for discharging the purified gas, and having two stages of first and second stages as basic elements. )Wow, Reactor first stage (4) for reacting the gas introduced into the reactor body (1) by the impulse frequency streamer corona discharge in a special electric field, Reactor second stage (5) for integrating the reaction product generated in the reactor first stage (4) using the electric field of the electrostatic precipitator structure, A high voltage pulse generator P _G having an impulse frequency characteristic for generating and supplying a high voltage impulse to the first stage 4 of the reactor 1, First and second high voltage power supplies P1 and P2 for supplying a high voltage to the first stage 4 of the reactor 1 through a high voltage pulse generator P _G to generate the high voltage impulse; And a third high voltage power supply (P3) for supplying a high voltage to the second stage (5) of the reactor (1). The method of claim 1, A gas distribution unit 17 installed at the lower portion of the inlet duct 2 to distribute the inflowing gas evenly throughout the reactor; A gas induction furnace 18 installed at the front end of the outlet duct 3 for inducing the discharge of the purified gas; A cooling water connector 16 for supplying cooling water to the dust collecting electrode 7 of the reactor first stage 4, A spray nozzle 22 installed for cleaning the inside of the reactor, A water supply pipe 23 for supplying water to the injection nozzles 22, A water supply header 24 for adjusting and maintaining an appropriate amount of cooling water and water to be supplied, Hazardous gas purification device further comprises a hopper (19) for collecting and discharging the reaction product accumulated in the second stage (5) of the reactor. The method according to claim 1 and 2, Said reactor first stage (4); A first stage dust collecting electrode 7 to be cooled in the form of a plate installed in parallel; Discharge electrode 6 of the sawtooth-shaped first stage disposed between the dust collecting electrodes (7), A discharge electrode fixing frame 27 for fixing the discharge electrodes 6, A discharge electrode set frame 15 for constituting a set of discharge electrodes 6 corresponding to the gas flow rate to be purified by using the discharge electrode fixing frame 27 fixing the discharge electrodes 6 as a unit block, A discharge electrode hanger support (10) for suspending and supporting the set of discharge electrodes (6); A discharge electrode hanger frame 11 for installing the sets of discharge electrodes 6, It includes an insulating support 12 for installing the discharge electrodes 6 through the high voltage insulation from the reactor body in order to supply a high voltage to the discharge electrodes 6 in the reactor through the discharge electrode hanger frame (11) Toxic gas purification device characterized in that. The method of claim 3, The discharge electrode (6) is a noxious gas purification device, characterized in that it has a number of 1 to 5 teeth per cubic meter (m3) of the gas to be purified. The method of claim 3, The dust collecting electrode 7 of the first stage is composed of a flat rectangular tube so that heat exchange capable of cooling in the form of a parallel plate is possible, and the cooling material flows through the cooling water inlet and outlet 31. Gas purifier. The method according to claim 1 and 2, The second stage 5 of the reactor includes a second stage dust collecting electrode 9 which is not cooled, a second stage discharge electrode 8 having a toothless flat plate or an external shape, and a lower portion of the hopper 19. And a product discharge pipe (21) connected to the discharge port (20) and a product discharge port (20) installed. The method according to claim 1 and 2, The area of the dust collection electrodes 7 and 9 may be increased by the distance of the relative electrode gap between the discharge electrodes 6 and 8 and the dust collection electrodes 7 and 9 so as to efficiently increase the conduction voltage between the electrodes to generate an optimum discharge. Hazardous gas purification device, characterized in that. In the noxious gas purification method of purifying the noxious gas into the reactor through the inlet duct and discharges the purified gas through the outlet duct, Converting a high voltage supplied from a high voltage power supply into a high voltage impulse having a frequency characteristic and supplying the same to the reactor; A reaction step of removing the harmful gas through a physicochemical reaction by radicals generated by the plasma generated by the streamer corona discharge at the first stage of the reactor by the supplied high voltage impulse; and Hazardous gas purification method comprising the accumulation step of collecting and accumulating the reaction product obtained in the reaction step by using an electric field in the second stage of the reactor. The method of claim 8, Hazardous gas purification method further comprising a discharge step of collecting and discharging the reaction product accumulated in the accumulation step. In the gas purifying apparatus for purifying harmful gas containing various harmful substances discharged from industrial facilities, A high voltage power supply (P ₁ , P ₂ , P ₃ ) for supplying a high voltage to generate a high voltage impulse, A high voltage impulse generator (P _G ) for converting the high voltage supplied from the high voltage power supplies (P ₁ , P ₂ , P ₃ ) into a high voltage having an adjustable base voltage and a frequency operating characteristic; Reactor first stage (4) receiving a high voltage impulse of adjustable frequency characteristics supplied from the high voltage impulse generator (P _G ) to generate a plasma through the streamer corona discharge to remove the harmful gas through a physicochemical reaction, Reactor second stage (5) consisting of an electrostatic precipitator for accumulating the reaction product generated by the harmful gas removed in the reactor first stage (4), The toxic gas purification device consisting of a hopper (19) provided to collect and discharge the reaction product accumulated in the second stage (5) of the reactor.