WO2016204516A1

WO2016204516A1 - Exhaust gas processing device

Info

Publication number: WO2016204516A1
Application number: PCT/KR2016/006368
Authority: WO
Inventors: 박정봉
Original assignee: 박정봉
Priority date: 2015-06-16
Filing date: 2016-06-15
Publication date: 2016-12-22
Also published as: KR101567746B1; CN108064187A

Abstract

The present invention relates to an exhaust gas processing device which is capable of collectively processing harmful emissions emitted during combustion, etc., the device comprising: a dust collection equipment for removing organic materials or particulate materials contained in an exhaust gas; a desulfurization equipment for reducing sulfur oxides contained in the exhaust gas; and a low-temperature plasma reactor and a high-temperature microwave plasma reactor for reducing nitrogen oxides contained in the exhaust gas.

Description

Exhaust gas treatment system

The present invention relates to an exhaust gas treating apparatus.

In general, particulate matter, sulfur oxides, and nitrogen oxides, which are harmful emissions of products generated by burning fossil fuels in a plant or a combustion device, are reduced to the maximum by various methods, and thus, it is necessary to keep the atmosphere clean. It is a reality that is emerging.

In particular, representative reduction methods of nitrogen oxides currently known employ selective catalytic reduction and selective non-catalytic reduction. Such selective catalytic reduction and selective non-catalytic reduction are well known techniques and detailed descriptions thereof are avoided.

Basically, Selective Catalytic Reduction (SCR) is designed to reduce nitrogen oxides by supplying ammonia as a reducing agent through an ammonia injector (AIG) downstream of the combustion device to cause a reduction reaction in the catalytic reaction tower. In this selective catalytic reduction method, when the combustion apparatus is in a low load state or when the temperature of the exhaust gas to be introduced into the catalytic reaction column is low, the reaction of nitrogen oxides is markedly degraded. There is a problem that can cause a bad effect on the rear end equipment.

In addition, Selective Non-Catalytic Reduction (SNCR) is designed to directly inject ammonia or urea into the combustor and reduce it by reacting with nitrogen oxides generated through the combustion of fossil fuels in the combustor. . This selective non-catalytic reduction method is designed to supply liquid ammonia or urea water into the combustor as described, which can cause unexpected large accidents when water droplets come into contact with the boiler tube as the reducing agent is injected into the combustor. Risks are always present, and in fact, some companies have experienced significant losses.

In addition, the denitrification system to which the selective non-catalytic reduction method is applied has a limitation in that the denitrification rate is lowered while high efficiency can be obtained at a low load of the combustion apparatus.

[Prior art document]

(Patent literature)

(Patent Document 1) Korean Patent Application No. 10-2007-0007369

An object of the present invention is to remove the harmful pollutants contained in the exhaust gas by using a complex process of desulfurization equipment and denitrification equipment.

The present invention relates to a treatment apparatus capable of reducing various harmful emissions contained in exhaust gas emitted from an exhaust gas generating source.

In order to achieve the above object, an exhaust gas treating apparatus according to a first embodiment of the present invention comprises: an exhaust gas generating source for exhausting exhaust gas; A dust collecting unit disposed downstream of the exhaust gas generating source; A low temperature plasma reactor disposed downstream of the dust collector and oxidizing nitrogen monoxide discharged from the exhaust gas generating source to nitrogen dioxide; A desulfurization plant disposed downstream of the low temperature plasma reactor; A storage tank for storing and storing a reducing agent; A microwave plasma reactor receiving exhaust gas containing nitrogen oxide discharged from the desulfurization facility to a transfer pipe, and converting a reducing agent provided to a storage pipe supply pipe into a hot gas phase to help dissociate nitrogen oxides; A microwave generator for generating microwaves according to the application of power; And a plasma generator disposed between the microwave generator and the microwave plasma reactor and guiding the microwaves into the microwave plasma reactor through an induction tube to generate a flame; and collecting the exhaust gas discharged from the exhaust gas generator. And, it is characterized in that it is designed to remove contaminants contained in the exhaust gas by sequentially passing through a low temperature plasma reactor, a desulfurization facility, and a high temperature microwave plasma reactor.

In an embodiment of the present invention, the dust collector may be composed of an electric dust collector. The electrostatic precipitator can be expected to partially modify the nitrogen monoxide contained in the exhaust gas to nitrogen dioxide.

The desulfurization plant may consist of a wet desulfurization system.

The supply pipe of the reservoir further includes an improved supply module, which can supply the reducing agent stored in the storage tank according to the inflow amount of nitrogen oxide to be supplied to the microwave plasma reactor. This can optimize the amount of reducing agent used.

Specifically, the microwave plasma reactor arranges the tube end of the transfer tube toward the upper portion of the microwave plasma reactor so that the exhaust gas flows upward, while injecting the tube end of the induction tube from the top of the microwave plasma reactor from the top to the bottom of the flame. The direction can be made downward. The tube end of the transfer pipe and the end of the induction pipe can be arranged on the same axis to improve the contact of the downflow reducing agent with the flame and the upstream exhaust gas. Optionally, the feed tube may be introduced from the top to the bottom of the microwave plasma reactor to supply the reducing agent downflow, or may be joined to the guide tube and guide the inside of the microwave plasma reactor through the induction tube.

An exhaust gas treating apparatus according to a second embodiment of the present invention includes: an exhaust gas generating source for exhausting exhaust gas; Desulfurization equipment disposed downstream of the exhaust gas generating source; A dust collector disposed downstream of the desulfurization facility; A low temperature plasma reactor disposed downstream of the dust collector and oxidizing nitrogen monoxide discharged from the exhaust gas generating source to nitrogen dioxide; A storage tank for storing and storing a reducing agent; A microwave plasma reactor receiving exhaust gas containing nitrogen oxide discharged from the low temperature plasma reactor to a transfer pipe, and converting a reducing agent provided to a storage pipe supply pipe into a hot gas phase to help dissociate nitrogen oxides; A microwave generator for generating microwaves according to the application of power; And a plasma generator disposed between the microwave generator and the microwave plasma reactor and guiding the microwaves into the microwave plasma reactor through an induction tube to generate a flame. And, it is characterized in that it is designed to remove contaminants contained in the exhaust gas by sequentially passing through the dust collector, low temperature plasma reactor, and high temperature microwave plasma reactor.

The desulfurization plant may consist of a dry desulfurization system.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, the terms or words used in this specification and claims are not to be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

According to the description of the present invention, in accordance with the present invention, the present invention is arranged in-line form the abatement facilities for processing harmful substances such as organic matter or particulate matter, sulfur oxides, nitrogen oxides contained in the exhaust gas It aims at reducing collectively.

The present invention can significantly reduce the amount of reducing agent and improve the denitrification rate through the low temperature plasma reactor and the high temperature microwave plasma reactor.

In particular, the present invention can use a high-temperature plasma flame as a heat source of the microwave plasma reactor, it is possible to perform the denitrification process continuously without interrupting the operation of the denitrification system according to the replacement of the igniter and the like required for the flame generation in the prior art.

1 is a schematic process diagram of an exhaust gas treating apparatus according to a first embodiment of the present invention.

2 is a schematic process diagram of an exhaust gas treating apparatus according to a second embodiment of the present invention.

Figure 3 is a longitudinal sectional view schematically showing the inside of the microwave plasma reactor to be employed in the exhaust gas treatment apparatus of the present invention.

4 is a cross-sectional view of the microwave plasma reactor taken along the line A-A of FIG.

Advantages, features, and methods of achieving the present invention will be apparent from the embodiments described below in conjunction with the accompanying drawings. In the present specification, in adding the reference numerals to the components of each drawing, the same reference numerals refer to the same or similar components throughout the specification. In addition, when the detailed description of the related art related to the present specification makes the gist of the present invention unclear, the detailed description is omitted.

The exhaust gas treating apparatus according to the present invention will now be described in detail with reference to the accompanying drawings.

1 schematically shows a process diagram of an exhaust gas treating apparatus according to a first embodiment of the present invention, for example, sulfur oxides (SO _X ) and nitrogen oxides (NO _X ) in exhaust gases generated through combustion of fossil fuels. The present invention relates to a system for reducing harmful emissions such as particulate matter.

Schematically, the exhaust gas treating apparatus 1 according to the first embodiment of the present invention collects the exhaust gas discharged from the exhaust gas generating source 1000, the low temperature plasma reactor 200, and the desulfurization facility 300. ), And it is designed to remove contaminants, ie, particulate matter, sulfur oxides, nitrogen oxides, and the like contained in the exhaust gas by passing through the high temperature microwave plasma reactor 400 sequentially.

Here, the exhaust gas generating source 1000 may be a combustion furnace, a process heating furnace, an internal combustion engine, and an apparatus for discharging harmful gases such as nitrogen oxides and / or sulfur oxides through combustion, synthesis, and decomposition of (fuel) materials. Can be.

The exhaust gas generated through the combustion of the exhaust gas generator 1000 is guided to the dust collector 100 which collects foreign substances such as particulate matter except nitrogen oxide and sulfur oxide. The dust collector 100 is arranged in front of the desulfurization facility and the denitrification facility as described above, which may prevent particulate matter from entering the desulfurization facility and / or the denitrification facility in advance. As is well known to those skilled in the art, the exhaust gas treating apparatus according to the first embodiment of the present invention can install various types of dust collecting facilities, and in particular, the electric dust collector is contained in nitrogen monoxide (NO) contained in the exhaust gas during operation. It is possible to obtain the effect of partially reforming to nitrogen dioxide (NO ₂ ).

In the first embodiment of the present invention, the low-temperature plasma reactor 200 is disposed at the rear end of the dust collector 100. The low temperature plasma reactor 200 may provide a denitrification reaction of the collected exhaust gas under a low temperature (15 ~ 200 ℃). The low temperature plasma reactor 200 is an oxidation zone for oxidizing nitrogen monoxide (NO) to nitrogen dioxide (NO ₂ ) or nitric acid (HNO ₃ ). In other words, the low temperature plasma reactor 200 reduces the concentration of nitrogen monoxide due to the oxidation reaction of nitrogen monoxide and increases the concentration of nitrogen dioxide, thereby helping to increase the NO ₂ / NO ratio. As the ratio of nitrogen dioxide in the nitrogen oxides increases, the denitrification efficiency can be increased by improving the nitrogen oxide (NO _X ) decomposition rate in the microwave plasma reactor 400, and the economic efficiency can be improved by lowering the power consumption. The low temperature plasma reactor 200 may be a micro puls corona plasma discharge reactor. By low temperature is meant a lower temperature than the plasma flame in the microwave plasma reactor.

In addition, the exhaust gas discharged through the dust collector 100 is a low temperature plasma reactor with a higher NO ₂ / NO ratio than the exhaust gas discharged from the exhaust gas generator 1000 through some reforming of the dust collector 100. It may be directed to 200. As a result, by reducing the oxidation reaction to be made in the low temperature plasma reactor 200 will be able to reduce the power consumption of the operation of the low temperature plasma reactor 200.

Exhaust gas treatment apparatus according to a first embodiment of the present invention is a separate desulfurization facility 300 downstream of the low temperature plasma reactor 200, that is, between the low temperature plasma reactor 200 and the microwave plasma reactor 400. Can be placed. The desulfurization facility 300 preferably employs a wet desulfurization system. As is well known to those skilled in the art, wet desulfurization systems utilize sulfuric acid-containing exhaust gases in aqueous solutions or slurries to reliably decompose and / or capture sulfur oxides in exhaust gases to reduce sulfur oxide emissions. You can. Water contained in the liquid reagent may be introduced into the microwave plasma reactor 400 together with the exhaust gas through the exhaust gas transfer pipe T1 extending from the desulfurization facility 300. The water introduced from the transfer pipe T1 has a hydroxyl group (OH ⁻ ), so that the chemical coupling with the reactor of different properties may be easily performed to promote a reduction reaction to be caused in the microwave plasma reactor 400.

In particular, the exhaust gas treating apparatus according to the first embodiment of the present invention decomposes nitrogen oxide contained in the exhaust gas discharged from the exhaust gas generator 1000 and the reducing agent supplied from the storage tank 600 under a high temperature plasma flame. And / or a microwave plasma reactor (400) for converting to a gas such as nitrogen, carbon dioxide, water through reduction.

The reservoir 600 is a supply source of a reducing agent to be provided to the microwave plasma reactor 400, and the reservoir 600 is provided by the improved supply module 700 based on the inflow amount of nitrogen oxide to be guided to the microwave plasma reactor 400. ), A predetermined amount of reducing agent is provided to the back end equipment, such as the microwave plasma reactor 400. The improved supply module 700 determines the flow rate required by the microwave plasma reactor 400 as described above, the amount of nitrogen oxide discharged from the low temperature plasma reactor 200 and the amount of urea (ammonia amount) required therefor. It is calculated according to the equivalent ratio to supply the reducing agent through the improved supply module 700. The reducing agent controlled through the improved feed module 700 is supplied to the microwave plasma reactor 400.

The storage tank 600 contains a reducing agent in the liquid or vapor phase in order to improve the fluidity of the reducing agent and to ensure stability, but is not limited thereto, and various compositions, such as urea water, urea (NH ₂ CONH ₂ ), and ammonia (NH) ₃ ), a reducing agent such as ammonium carbonate (NH ₄ CO ₃ ), cyanuric acid (HNCO) and the like. The reducing agent of the present invention may be urea as described above, which can be slowly hydrolyzed to ammonium carbonate in aqueous solution at room temperature, sublimed above the melting point and converted to ammonia and cyanuric acid.

The present invention may forcibly supply various reducing agents such as ammonia or urea into the microwave plasma reactor 400 to cause decomposition under high temperature atmosphere or phase conversion from liquid phase to gas phase.

The microwave plasma reactor 400, for example, after receiving a reducing agent of urea (or urea water) may not only reform such urea with ammonia through thermal hydrolysis as shown in Chemical Formula 1, but also undergo thermal decomposition as shown in Chemical Formula 2. To occur in the microwave plasma reactor 400.

After the reaction as in Chemical Formula 2, ammonia and cyanuric acid are produced. In order to realize such a thermal decomposition reaction, the microwave plasma reactor 400 requires a considerable amount of heat.

In other words, the microwave plasma reactor 400 phase-converts the liquid urea water to a reducing agent such as gaseous ammonia, which is a decomposition gas of urea, using a high temperature flame, that is, heat. For this phase conversion process, the necessary heat may be a flame made of the microwave generator 800 and the plasma generator 900 as a heat source.

The products ammonia and cyanuric acid are reacted with nitrogen oxides in a denitrification system such as a microwave plasma reactor. It is converted into a gaseous ammonia reducing agent through various reaction mechanisms so that the denitrification of nitrogen oxides takes place in the high temperature reactor 400. The gaseous reducing agent may be denitrified through a reaction of nitrogen oxide generated by combustion of fossil fuel in the exhaust gas generator 1000 and the following Chemical Formula 3 or Chemical Formula 4 below.

As shown in Formula 3, ammonia is hydrolyzed in the microwave plasma reactor 400 to cause a reaction with nitrogen oxides, thereby producing nitrogen (N ₂ ) and water (H ₂ O), which are harmless to the human body. Finally, since nitrogen and water are discharged through the chimney 500, it is possible to prevent the emission of pollutants in the air environment in advance.

The cyanuric acid supplied from the storage tank 600 or generated by Chemical Formula 2 may induce a reaction with nitrogen oxides as shown in Chemical Formula 4 above. As the chemical reaction proceeds, harmful nitrogen oxides may be reacted with nitrogen and carbon dioxide (CO ₂ ). It is converted into a material that is not related to air pollution. For reference, since the amount of carbon dioxide generated is less than a few ppm, it may be extremely small to provide a cause as an environmental pollutant.

Optionally, the reducing agent contained in the reservoir 600 is preferably composed of a water-soluble reducing agent. Water-soluble reducing agent as shown in formula (4) a hydroxyl group (OH ^-) are generated in the moisture (humidity) can be achieved here has, the easier the reactor and the chemical composition of the different properties. Specifically, the anion hydroxyl group is rapidly combined with hydrogen (H ⁺ ) is converted into water, and the contact time efficiency of the nitrogen oxide can be improved to reduce the residence time of the nitrogen oxide in the microwave plasma reactor 400.

The present invention is a reduction zone capable of converting various kinds of reducing agents into the gas phase and ammonia in the high temperature microwave plasma reactor 400 as well as inducing denitrification at the same time.

The microwave plasma reactor 400 may be supplied with a high temperature heat source in the following manner, and it is noted that in addition to the method described below, other methods for generating microwave plasma may be employed.

The microwave generator 800 is driven according to the application of power to generate microwaves. The microwave is guided to the plasma generator 900 via, for example, a waveguide, while the plasma generator 900 discharges the plasma generating gas into the reactor through an induction pipe T3 extending into the microwave plasma reactor 400. Done. As is widely known, microwaves are microwaves and are electromagnetic waves having a frequency range of 30 MHz to 30 GHz and are used to generate plasma. When the microwave is irradiated onto the dielectric, molecules of the dielectric are rotated and heat is generated due to collision between the molecules.

The plasma generator 900 may generate high heat by exposing plasma generating gases such as, for example, steam for generating plasma, fine water, and inert gas to vibrations of the microwaves guided by the microwave generator 800. In addition, flames are generated in the microwave plasma reactor 400 by the generated high heat. Flame (plasma) temperature generated in the microwave plasma reactor 400 may be 2,000 ~ 4,000 ℃. In this high temperature reactor 400, a continuous plasma is generated. Plasma is a gas that is ionized with electrons having positive charges and cations with positive charges, and the ionized electrons and / or cations may improve the resolution of harmful gases.

As is widely known, plasma generating gas may be air, nitrogen, or combustion gas, but the present invention aims to reduce nitrogen oxides in a microwave plasma reactor. That is, in order to prevent the conversion of nitrogen (N ₂ ) to nitrogen monoxide in the air in the reactor, it is preferable to use steam, fine jet water or an inert gas as the plasma generating gas.

As described above, the plasma generator 900 does not require a separate igniter because the flame may be generated due to the high temperature via the vibration of the microwave, so the structural simplification and durability of the exhaust gas treatment apparatus according to the present invention. Can improve.

As described above, the exhaust gas and the gaseous reducing agent cause denitrification through the chemical formula and the like already described in the microwave plasma reactor 400. After the nitrogen oxides are removed, the hot exhaust gas is exhausted to the chimney 500.

FIG. 2 schematically illustrates a process diagram of an exhaust gas treating apparatus according to a second exemplary embodiment of the present invention. The exhaust gas treating apparatus 1 ′ according to the second exemplary embodiment of the present invention is illustrated in FIG. As another modification of the treatment apparatus 1, except for the arrangement position of the dust collecting equipment 100 and the desulfurization equipment 300, it has a very similar structure, so that similar or identical configurations are provided for the clarity of understanding of the present invention. The description of the absence will be excluded here.

The exhaust gas treatment apparatus 1 ′ according to the second embodiment of the present invention is configured to exhaust the exhaust gas discharged from the exhaust gas generator 1000, the desulfurization facility 300, the dust collecting facility 100, the low temperature plasma reactor 200, And sequentially pass through the high temperature microwave plasma reactor 400 to remove contaminants, ie, sulfur oxides, particulate matter, nitrogen oxides, and the like contained in the exhaust gas.

Exhaust gas generated through the combustion of the exhaust gas generator 1000 is preferentially desulfurized downstream of the exhaust gas generator 1000, that is, between the exhaust gas generator 1000 and the dust collector 100 to remove sulfur oxides. The facility 300 can be arranged. The desulfurization plant 300 preferably employs a dry desulfurization system. As is well known to those skilled in the art, dry desulfurization systems can remove particles of activated carbon, carbonates and the like by adsorbing or reacting sulfur oxides, in particular sulfur dioxide, by contacting the exhaust gas. The dry desulfurization system consumes less water than the wet desulfurization system and can guide the exhaust gas to the dust collector 100 without the need to reheat the exhaust gas. The exhaust gas from which sulfur oxides are removed through the desulfurization facility 300 may employ a dust collector (filtration dust collector, cleaning dust collector) that has a low moisture content and is vulnerable to removing hydrophilic particulate matter. For example, when the bag filter is operated in a wet state, it is inevitable to reduce the collection efficiency by closing and shielding the pores of the bag filter or the filter agent.

The desulfurized exhaust gas is guided to the dust collecting facility 100 for collecting foreign matter such as particulate matter. The dust collector 100 is arranged between the desulfurization and denitrification equipment as described above, which allows particulate matter to flow into the denitrification equipment to prevent unnecessary side reactions. As is well known to those skilled in the art, the exhaust gas treating apparatus according to the second embodiment of the present invention may also install various types of dust collectors downstream of the dry desulfurization equipment, such as filter dust collectors, washing dust collectors, and the like, which are vulnerable to the treatment of hydrophilic particulate matter. Can be. In particular, in the second embodiment of the present invention, an effect of partially modifying nitrogen monoxide contained in the exhaust gas into nitrogen dioxide can be additionally obtained through an electric dust collector.

According to the second embodiment of the present invention, the low temperature plasma reactor 200 is disposed at the rear end of the dust collector 100. The low temperature plasma reactor 200 may provide a denitrification reaction of the collected exhaust gas under a low temperature (15 ~ 200 ℃). The low temperature plasma reactor 200 is an oxidation region for oxidizing nitrogen monoxide to nitrogen dioxide or nitric acid. In other words, the low temperature plasma reactor 200 reduces the concentration of nitrogen monoxide due to the oxidation reaction of nitrogen monoxide and increases the concentration of nitrogen dioxide, thereby helping to increase the NO ₂ / NO ratio. As the ratio of nitrogen dioxide in the nitrogen oxides increases, the denitrification efficiency can be increased by improving the nitrogen oxide (NO _X ) decomposition rate in the microwave plasma reactor 400, and the economic efficiency can be improved by lowering the power consumption. The low temperature plasma reactor 200 may be a microflax corona plasma reactor. By low temperature it is meant a lower temperature than the plasma flame in the microwave plasma reactor.

In addition, the exhaust gas discharged through the dust collector 100 is a low temperature plasma reactor with a higher NO ₂ / NO ratio than the exhaust gas discharged from the exhaust gas generator 1000 through some reforming of the dust collector 100. Guided to 200. This may reduce power consumption due to the operation of the low temperature plasma reactor 200 by reducing the oxidation reaction to be made in the low temperature plasma reactor 200.

The exhaust gas treating apparatus according to the second embodiment of the present invention decomposes and / or reduces nitrogen oxide contained in the exhaust gas discharged from the exhaust gas generator 1000 and the reducing agent supplied from the storage tank 600 under a high temperature plasma flame. It is characterized in that the microwave plasma reactor 400 for converting into a gas such as nitrogen, carbon dioxide, water through the rear end of the low-temperature plasma reactor (200).

The storage tank 600 contains a reducing agent in the liquid or vapor phase in order to improve the fluidity of the reducing agent and to ensure stability, but is not limited thereto, and various compositions such as urea water, urea (NH ₂ CONH ₂ ), and ammonia (NH ₃ ), a reducing agent such as ammonium carbonate (NH ₄ CO ₃ ), cyanuric acid (HNCO) and the like. The reducing agent of the present invention may be urea as described above, which can be slowly hydrolyzed to ammonium carbonate in aqueous solution at room temperature, sublimed above the melting point and converted to ammonia and cyanuric acid.

The products ammonia and cyanuric acid are reacted with nitrogen oxides in a denitrification system such as a microwave plasma reactor. It is converted into a gaseous ammonia reducing agent through various reaction mechanisms so that the denitrification of nitrogen oxides takes place in the high temperature reactor 400. Such a gaseous reducing agent may be denitrified through a reaction of the nitrogen oxide generated by the combustion of the fossil fuel in the exhaust gas generator 1000 with the formula (3) or the formula (4).

As ammonia is hydrolyzed in the microwave plasma reactor 400 as shown in Chemical Formula 3, ammonia reacts with nitrogen oxides, thereby producing nitrogen (N ₂ ) and water (H ₂ O), which are harmless to the human body. Finally, since nitrogen and water are discharged through the chimney 500, it is possible to prevent the emission of pollutants in the air environment in advance.

The microwave generator 800 is driven according to the application of power to generate microwaves. The microwave is guided to the plasma generator 900 via, for example, a waveguide, while the plasma generator 400 discharges the plasma generating gas into the reactor through an induction pipe T3 extending into the microwave plasma reactor 400. Done. As is widely known, microwaves are microwaves and are electromagnetic waves having a frequency range of 30 MHz to 30 GHz and are used to generate plasma. When the microwave is irradiated onto the dielectric, molecules of the dielectric are rotated and heat is generated due to collision between the molecules.

FIG. 3 is a longitudinal sectional view schematically showing the inside of the microwave plasma reactor shown in FIG. 1 or FIG. 2, and FIG. 4 is a cross sectional view of the microwave plasma reactor shown in FIG. 3.

As shown, the microwave plasma reactor 400 is placed on top of the plasma generator 900, the induction pipe (T3) of the plasma generator 900 is located on the axis of the microwave plasma reactor 400 Allow intrusion towards the bottom.

The reducing agent supply pipe T2 extended in the storage tank 600 is also introduced into the microwave plasma reactor 400, so that the reducing agent can be supplied into the reactor 400. The reducing agent supply pipe T2 penetrates through the upper side of the microwave plasma reactor 400 and flows downward to flow the reducing agent downward. In particular, the tube end of the reducing agent supply pipe (T2) is joined to the induction pipe (T3), so that the tube end of the induction pipe (T3) can be injected into the reactor with the flame.

In addition, the microwave plasma reactor 400 injects exhaust gas, such as nitrogen oxide, to be injected into the reactor so that it can be turned upstream in the reactor 400. To this end, the present invention injects the exhaust pipe (T1) for the exhaust gas extending from the desulfurization facility 300 of the first embodiment or the low temperature plasma reactor 200 of the second embodiment into the microwave plasma reactor 400, The tube end of the transfer pipe (T1) is to be installed toward the upper direction of the reactor (400). The exhaust gas guided to the transfer pipe T1 may be formed as a swirling airflow that rotates at high speed along the inner surface of the reactor and may move upward.

In the present invention, the microwave plasma reactor 400 may continuously supply the reducing agent guided in the downflow and the exhaust gas guided in an upflow in a counter flow manner, thereby increasing the chance of contact between the reducing agent and the exhaust gas. . As shown, the flame and the reducing agent are formed in a downflow to increase the time to contact with the exhaust gas is turned upwards to promote the reduction reaction can be expected the best denitrification effect.

The present invention is the same in accordance with the longitudinal direction of the reactor of the tube end of the inlet pipe (T3) which can be injected downward and the tube end of the upwardly open exhaust pipe (T1) to double the direct contact between the reducing agent and the exhaust gas Be placed on the axis.

Optionally, the microwave plasma reactor 400 may include a swirler 410 therein to assist in swirl gas flow movement of the exhaust gas and the reducing agent.

In the exhaust gas treating apparatus according to the present invention, nitrogen oxide can reduce nitrogen monoxide and nitrogen dioxide to a low level while continuously passing through the oxidation region of the low temperature plasma reactor 200 and the reducing region of the microwave plasma reactor 400. . As described above, the present invention can improve the denitrification rate and economic efficiency by combining the reaction process by the plasma and the reducing agent in the microwave plasma reactor (400). In addition, the present invention can significantly reduce the consumption of the reducing agent through the activation of the reducing agent.

In addition, the exhaust gas treatment apparatus according to the present invention can reduce the amount of sulfur oxides by means of the desulfurization facility (300).

Although the present invention has been described in detail with reference to specific embodiments, it is intended to describe the present invention in detail, and the exhaust gas treating apparatus according to the present invention is not limited thereto. It is obvious that modifications and improvements are possible by the knowledgeable.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

[Explanation of code]

100 ----- dust collector,

200 ----- low temperature plasma reactor,

300 ----- desulfurization equipment,

400 ----- microwave plasma reactor

500 ----- chimney,

600 ----- reservoir,

700 ----- improved supply module,

800 ---- microwave generator,

900 ----- plasma generator,

1000 ----- Source of exhaust gas.

Claims

An exhaust gas generator 1000 for exhausting exhaust gas;

A dust collector (100) disposed downstream of the exhaust gas generator (1000);

A low temperature plasma reactor (200) disposed downstream of the dust collector (100) and oxidizing nitrogen monoxide (NO) discharged from the exhaust gas generating source (1000) to nitrogen dioxide (NO 2 );

A desulfurization facility (300) disposed downstream of the low temperature plasma reactor (200);

A storage tank 600 for storing and storing a reducing agent;

Receiving the exhaust gas containing nitrogen oxide discharged from the desulfurization facility 300 to the transfer pipe (T1), converts the reducing agent provided to the supply pipe (T2) of the storage tank 600 to a high temperature gas phase to the nitrogen oxide Microwave plasma reactor 400 to help dissociation of;

A microwave generator 800 generating microwaves according to the application of power; And

Plasma generator disposed between the microwave generator 800 and the microwave plasma reactor 400, and guides the microwaves into the microwave plasma reactor 400 through the induction pipe (T3) to generate a flame 900; exhaust gas treatment device consisting of.
The method according to claim 1,

The dust collector 100 is an exhaust gas treatment device consisting of an electric dust collector.
The method according to claim 1,

The desulfurization facility 300 is an exhaust gas treatment device consisting of a wet desulfurization system.
The method according to claim 1,

Supply pipe (T2) of the reservoir 600 is an exhaust gas treatment device further comprises an improved supply module (700).
The method according to claim 1,

The tube end of the transfer pipe (T1) is installed toward the upper direction in the microwave plasma reactor 400,

The induction pipe (T3) is introduced from the top of the microwave plasma reactor 400 toward the bottom,

The supply pipe (T2) is joined to the induction pipe (T3) for exhaust gas treatment apparatus for guiding the reducing agent in the microwave plasma reactor (400) downstream.
An exhaust gas generator 1000 for exhausting exhaust gas;

A desulfurization facility (300) disposed downstream of the exhaust gas generating source (1000);

A dust collecting facility (100) disposed downstream of the desulfurization facility (300);

A low temperature plasma reactor (200) disposed downstream of the dust collector (100) and oxidizing nitrogen monoxide (NO) discharged from the exhaust gas generating source (1000) to nitrogen dioxide (NO 2 );

A storage tank 600 for storing and storing a reducing agent;

The exhaust gas containing nitrogen oxide discharged from the low temperature plasma reactor 200 is supplied to the transfer pipe T1, and the reducing agent provided to the supply pipe T2 of the storage tank 600 is converted into a high temperature gas phase to provide the nitrogen. A microwave plasma reactor 400 to assist in dissociation of oxides;

A microwave generator 800 generating microwaves according to the application of power; And

Plasma generator disposed between the microwave generator 800 and the microwave plasma reactor 400, and guides the microwaves into the microwave plasma reactor 400 through the induction pipe (T3) to generate a flame 900; exhaust gas treatment device consisting of.
The method according to claim 6,

The dust collector 100 is an exhaust gas treatment device consisting of an electric dust collector.
The method according to claim 6,

The desulfurization facility 300 is an exhaust gas treatment device consisting of a dry desulfurization system.
The method according to claim 6,

Supply pipe (T2) of the reservoir 600 is an exhaust gas treatment device further comprises an improved supply module (700).
The method according to claim 6,

The tube end of the transfer pipe (T1) is installed toward the upper direction in the microwave plasma reactor 400,

The induction pipe (T3) is introduced from the top of the microwave plasma reactor 400 toward the bottom,

The supply pipe (T2) is joined to the induction pipe (T3) for exhaust gas treatment apparatus for guiding the reducing agent in the microwave plasma reactor (400) downstream.