JP2003251146A - Method for removing dioxins and dust by using high temperature plasma and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for removing dioxins and dust by using high temperature plasma capable of removing various kinds of contaminants from an exhaust gas, and a device therefor. <P>SOLUTION: The method for removing the dioxins and the dust by using the high temperature plasma is provided with; a decomposition step for thermochemically destroying the exhaust gas produced at a calcinator in a calcining facility and containing dioxins, soot, dust and an incompletely burned substance by using the high temperature plasma; a cooling/washing step for rapidly cooling the exhaust gas of high temperature generated from the decomposition step and simultaneously washing the contaminants contained in the exhaust gas; a moisture content removal step for removing a moisture content contained in the exhaust gas cooled in the cooling/washing step; and a cooling waste water drain step for discharging the cooling water used in the cooling/ washing step and the cooling waste water condensed in the moisture content removal step. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dioxin removal device, and more specifically, it exhausts exhaust gas from a waste incineration facility by completely burning it with high-temperature plasma and then spraying cooling and washing water to rapidly discharge the exhaust gas. By cooling the dioxin in the subsequent step, it is possible to prevent the re-synthesis of dioxin and the production of nitric oxide, and to clean the various environmental substances contained in the exhaust gas. Regarding

[0002]

2. Description of the Related Art Along with the rapid industrialization and urbanization, the amount of industrial waste and municipal solid waste is increasing. As a result, various technologies have been developed to treat waste in a more environmentally friendly manner, and incineration is a desirable waste treatment method in that the amount of landfilled waste can be significantly reduced and energy can be recovered. Is recognized as However, when incinerating waste, the exhaust gas generated contains various pollutants such as dioxin, nitric oxide, sulfates, and dust, and in particular, the production of dioxin, which is a carcinogen and an environmental hormone, is a waste product. The current situation is that it is a major obstacle to the installation and operation of incineration facilities.

In general, dioxins are PCDDs (polychlorinated dibs).
enzo-p-dioxins) and PCDFs (pol
ychlorinated dibenzofuran
s) refers to organic compounds, whose molecular structure is so stable that it is difficult to decompose in the natural state, and once it enters the body, it cannot be excreted and accumulated, causing cancer induction, or having a hormone-regulating function. It is a very harmful substance that damages the reproductive system and immune system.

Dioxins are produced through various routes, but in incinerators that incinerate municipal waste, they are mainly contained in wastes or chlorophenols and benzene chlorides generated during incomplete combustion. It is known that chlorine-based precursors such as polychlorinated biphenyls (PVC) react with each other in an incinerator to generate dioxin, or by a substitution reaction from a chloride capable of appropriately providing chlorine with an organic substance. . However, when the combustion temperature of the waste incinerator exceeds 900 ° C, dioxin is destroyed by the high temperature of the incinerator, so the amount of dioxin observed at the outlet of the incinerator operating at a substantially high temperature is a percentage. There are not many.

On the other hand, the fly ash (fly ash) contained in the combustion gas at a temperature of 250 to 350 ° C. after the hydrocarbon compound which could not be completely oxidized from the waste incinerator was discharged from the incinerator together with the combustion gas. ) It was found that the amount of dioxin formed on the surface by reacting with the chlorine donor was relatively large. That is, since dioxin existing in the incinerator is destroyed in the combustion process, dioxin should not be detected in the chimney of the incineration facility, but the fact that a substantial amount of dioxin is detected causes dioxin to burn as combustion gas. It can be seen that after leaving the incinerator it is virtually synthesized. In addition, the combustion gas is 250
Economizer operated at ~ 350 ℃
It has already been confirmed from the fact that a large amount of dioxins are produced through an ionizer) or an electric dust collector.

[0006] As described above, dioxin has a temperature range of 25.
The active generation at 0 to 300 ° C. is because chlorine is actively generated from the chloride by the catalytic action of copper or the like in this temperature range. Therefore, in order to reduce the amount of dioxin emitted from the waste incineration facility, firstly, the operation of the incinerator should be directed toward complete combustion to maximize the destruction of organic substances and minimize the production of various dioxin precursors. Secondly, it is necessary to avoid the temperature zone where dioxin can be produced in the subsequent step, or to minimize the residence time when operating in that temperature zone.

On the other hand, the dioxin removing device which has been mainly used in the waste incineration facility until now is SDA (Spr).
ay Dryer Absorption), SCR,
A method combining an SNCR and a dust collector and an adsorption method using activated carbon are used. (For example, refer to Patent Document 1.)

Particularly, SDA (Spray Dryer Absor) capable of removing the acidic gas and heavy metal components in the exhaust gas
It is known that the method of additionally installing a dust collector in the pion) is also excellent in removing dioxins, and SNCR (Selective No.), which is a technique for injecting ammonia as a means for controlling NOx from the incinerator.
It is known that a method in which a dust collector is combined with n-Catalytic Reduction is also effective in suppressing the generation of dioxin. In addition, SCR (Sel
When a dust collector is combined with the Active Catalyst Reactor, there is a 90% or more dioxin removal effect when operated in the proper temperature range. However, since all such methods are combined with a dust collector, the collected pollutants should be treated as industrial waste, and when a catalyst is used, the catalyst activity (catalyst activity)
There is a problem that installation costs and operating costs are high, such as the fact that lytic activity may drop sharply due to heavy metals, so it should be installed after a post-treatment facility that can remove even heavy metals and extremely fine particles. It was

Almost two types are used as a method for adsorbing dioxins by using a substance mixed with activated carbon, coke or small lime, one of which is a gas in a solid-phase activated carbon adsorption layer. The second method is to pass dioxin through the filter layer of the bag filter and then to adsorb dioxin. It was designed to be collected in.

[0010]

[Patent Document 1] Japanese Patent Laid-Open No. 05-220338

[0011]

However, in the adsorption method using such activated carbon, the dust collector is overloaded by the activated carbon that is introduced, and the replacement cycle of the filtration bag is shortened.
There are various problems such as the limit of performance improvement of the reduction device and lack of space due to the addition of the improvement device.

Therefore, the present invention has been made in view of the problems in the conventional method and apparatus for removing dioxin and dust, and the present invention is applied to the dioxin formation process and the waste incinerator in a waste incinerator. In consideration of the actual operating conditions, exhaust gas discharged from a waste incinerator is completely combusted using high-temperature plasma, after which the dioxin precursor contained in the exhaust gas is resynthesized or acid substances such as nitric oxide are included. It is an object of the present invention to provide a dioxin and dust removal method using high-temperature plasma and a device therefor, which can remove various pollutants from exhaust gas by rapidly cooling and washing at the same time so as to prevent the generation of And

[0013]

A method for removing dioxin and dust using high temperature plasma according to the present invention, which has been made in order to achieve the above object, provides a method for removing dioxin and dust in a waste incinerator.
Produced in the incinerator of the incineration facility, dioxin, soot,
Decomposition stage in which exhaust gas containing dust and incompletely combusted substances is thermochemically destroyed by using high temperature plasma, and high temperature exhaust gas generated from the decomposition stage is rapidly cooled, and at the same time, pollution contained in the exhaust gas In the cooling and washing step for washing the substance, in the water removing step for removing the water contained in the exhaust gas cooled in the cooling and washing step, in the cooling water used in the cooling and washing step and the water removing step. And a cooling wastewater drainage stage for discharging the condensed cooling wastewater.

The decomposition step is performed by using a high temperature plasma.
It is characterized in that the temperature is maintained at 00 ° C or higher. The cooling and washing step is characterized by rapidly lowering the temperature to 200 ° C. or lower using sprayed cooling water.

Further, the dioxin and dust removing apparatus using high temperature plasma according to the present invention made to achieve the above object is a dioxin and a dioxin precursor generated from an incinerator of the incineration facility in a waste incineration facility. A reaction chamber into which the exhaust gas containing fly ash and incompletely combusted substances is introduced, and a high temperature provided on one side of the reaction chamber to completely burn the exhaust gas introduced into the reaction chamber using high temperature plasma. Plasma torch and exhaust gas discharged from the reaction chamber are rapidly cooled to re-synthesize dioxin or prevent formation of nitrogen oxides, and at the same time, hydrogen sulfide, sulfate and Included in the cooling and cleaning chamber where a large number of cooling water nozzles are formed so that dust can be cleaned, and the exhaust gas discharged from the cooling and cleaning chamber. Is a demister for removing moisture and, characterized in that it is constituted by a cooling waste water discharge means for discharging the cooling waste water generated from the said cooling and washing chamber demister.

The high temperature plasma torch is characterized in that a nitrogen gas (N ₂ ) is ionized by using a DC arc discharge or a high frequency inductively coupled discharge to form a high temperature plasma flame of 900 ° C. or higher. The high temperature plasma torch includes a torch body formed of a hollow tube, a cathode rod provided inside the torch body, a nitrogen gas inlet formed so that nitrogen gas can be injected into the torch body, and It is characterized in that the cooling water circulated inside the hollow tube of the main body and the torch main body and a power supply means for supplying power to the cathode rod are provided.

The dioxin and dust removing apparatus using high temperature plasma according to the present invention, which has been made to achieve the above object, is a dioxin and a dioxin precursor generated from an incinerator of the incineration facility in a waste incineration facility. In order to allow the inflow of exhaust gas containing fly ash and incompletely combusted substances, it is provided in-line in the duct of the incineration facility for wastes, etc. A reaction chamber provided with a large number of high-temperature plasma torches as possible and adjacent to the reaction chamber to rapidly cool the exhaust gas discharged from the reaction chamber, and at the same time clean the pollutants contained in the exhaust gas. Cooling and cleaning chamber in which a large number of cooling water nozzles are formed, and water contained in the exhaust gas discharged from the cooling and cleaning chamber. And demister for taking, characterized in that it is constituted by a cooling waste water discharge means for discharging the cooling waste water generated from the said cooling and washing chamber demister.

The reaction chamber is maintained at a temperature of 900 ° C. or higher. A large number of plasma torches provided in the reaction chamber are installed in a crossed manner so that the temperature inside the reaction chamber is uniform, and the plurality of plasma torches are installed in a tilted manner to stir the inflowing exhaust gas. . The reaction chamber is made of a heat-resistant material that can withstand high temperatures, and a cooling device for protecting the inner wall of the reaction chamber is provided outside the reaction chamber. The exhaust gas is rapidly lowered to 200 ° C. or lower by finely jetting cooling water from a large number of cooling water nozzles provided in the cooling and cleaning chamber.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, specific examples of embodiments of a dioxin and dust removing method using high temperature plasma and an apparatus therefor according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic process diagram showing a method for removing dioxin and dust using high temperature plasma according to the present invention. As shown in FIG. 1, the present invention comprises a decomposition step 100 for thermochemically decomposing exhaust gas containing dioxin, dust and incompletely combusted substances using high temperature plasma, and a high temperature generated by the decomposition step 100. Cooling and cleaning step 200 for rapidly cooling the exhaust gas and at the same time cleaning contaminants contained in the exhaust gas, and water removal step 3 for removing the water contained in the exhaust gas cooled in the cooling and cleaning step 200
00, the cooling water used in the cooling and washing step 200 and the cooling waste water draining step 400 for discharging the cooling waste water generated in the water removal step 300.

In the decomposition step 100 according to the present invention, an exhaust gas containing dioxins and dioxin precursors, fly ash, and incompletely combusted substances generated from an incinerator of a waste incinerator is used in a reaction chamber of a predetermined size. At the same time, the dioxin and the dioxin precursor and fly ash using high temperature plasma emitted from at least one high temperature plasma torch provided in the reaction chamber,
Then, the incompletely burned substance is completely burned and decomposed. That is, dioxin begins to decompose at 800 ° C or higher and 12
When the temperature reaches 00 ° C, the fly ash is completely decomposed, and the fly ash is re-burned at a high temperature to decompose the adsorbed dioxin precursor, and the fly ash structure is destroyed to lose the adsorptive power. Therefore, the high temperature plasma is maintained at a high temperature of 900 ° C. or higher, and more preferably 1500 ° C. or higher.

As described above, the first step of the method for removing dioxin and dust according to the present invention is to re-combust exhaust gas to a high temperature to inevitably generate dioxin and a dioxin precursor and dioxin resynthesis in the post-treatment step. This is a process for producing exhaust gas from which harmful substances have been removed by removing fly ash related to.

The hot exhaust gas discharged from the reaction chamber of the decomposition stage 100 flows into the cooling and cleaning stage 200.
That is, the exhaust gas emitted from the decomposition stage 100 is 100
Although the temperature is higher than 0 ° C, when such a high temperature state continues for a certain time or longer, NO reacts with oxygen to form nitrogen oxides (NOx), so the exhaust gas should be cooled below the reaction temperature. . Further, even dioxins or dioxin precursors decomposed in the decomposition step 100 are re-synthesized to form dioxins if they stay in a suitable temperature range, for example, 250 to 300 ° C. for a certain time or longer. Therefore,
It is necessary to reduce the temperature of the exhaust gas to 200 ° C or lower. When the temperature of the decomposition step 100 is cooled to a temperature of 200 ° C. or lower, it passes through a temperature range where nitrogen oxides and dioxins are generated. Therefore, the temperature should be rapidly cooled to shorten the residence time at the reaction temperature as much as possible. Is essential.

As described above, in the second step of the method for removing dioxin and dust according to the present invention, the high-temperature exhaust gas is rapidly cooled to 200 ° C. or lower, more preferably 70 ° C. or lower.
In the cooling and cleaning step 200, a large number of cooling water nozzles are provided in a cooling and cleaning chamber of a predetermined size for cooling, so not only the latent heat of the cooling water is used for rapid cooling, but also the sulphate contained in the exhaust gas. (SOx), hydrogen chloride gas (HCl), etc. are effective in cleaning acidic contaminants and dust.

In the cooling and washing step 200, a large amount of water is generated because the cooling water is directly sprayed on the hot exhaust gas in order to quickly cool the hot exhaust gas. Therefore, a water removing step 300 for removing water is provided downstream of the cooling and washing step 200, and the water removing step 300 is performed.
The cooling wastewater generated in the cooling and washing step 200 and the water removal step 300 is discharged to the outside through another drainage step 400, and is preferably transferred to a wastewater treatment device for purification treatment.
It is discharged or recycled as cooling water.

As described above, the process of removing dioxin and dust using the high temperature plasma according to the present invention is simpler than the conventional process of adsorbing activated carbon or combining SDA or SNCR with a dust collector, and the cooling process is simple. Other than treating wastewater, there is no need for another post-treatment and maintenance is easy. Also. The conventional exhaust gas removing apparatus using low-temperature plasma is large-scale and complicated, and another post-treatment process is necessarily required, but the present invention can have a small and relatively simple structure.

Next, FIG. 2 is a schematic sectional view showing an embodiment of a high temperature plasma torch used in the dioxin and dust removing apparatus using high temperature plasma according to the present invention. Such a high temperature plasma torch 20 uses an inert gas such as Ar or He, N ₂ , H ₂ , air or O ₂ , water vapor, by using a direct current arc discharge or a high frequency inductively coupled discharge.
A strong electric field is generated in a working gas such as a hydrocarbon gas, and charged particles are generated by continuous collision of accelerated electrons to generate high temperature plasma. Such high-temperature plasma (or thermal plasma) has a local thermal equilibrium in which all ionized particles maintain the same temperature, so heavy ions and neutral particles have a small heat capacity that is not in equilibrium at room temperature. The temperature is extremely higher than that of the low temperature plasma (or cold plasma) having

As shown in FIG. 2, a high temperature plasma torch 2
Reference numeral 0 denotes a torch body 23 formed of a cylindrical hollow tube, a cathode rod 25 provided inside the torch body 23, and a power supply for applying a predetermined voltage between the cathode rod 25 and the torch body 23. It is composed of a supply means. Therefore, the cathode rod 2
When a working gas such as N ₂ is injected into the torch body 23 provided with 5, the arc discharge occurs at the end of the cathode rod 25, and the high temperature plasma flame 27 is radiated. On the other hand, the hollow tube of the torch body 23 is provided with a cooling water inlet port 28 and an outlet port 31 to circulate the cooling water to protect the torch body 23 from high temperatures.

FIG. 3 shows a high temperature plasma torch 20.
FIG. 3 is a schematic cross-sectional view showing a place where the gas is provided at an exhaust port of an incineration facility, in which a reaction chamber 24 is formed in a lower portion of a torch body 23 and exhaust gas generated from an incinerator is a high temperature plasma flame
It is designed to be reburned by. Therefore, the pollutants contained in the exhaust gas flowing into the reaction chamber 24 are decomposed by the high temperature plasma and exhausted through the exhaust port 37.

Next, FIGS. 4 and 5 are schematic cross-sectional views showing an embodiment of a dioxin and dust removing apparatus using high temperature plasma according to the present invention. That is, as shown in FIG. 4, a direct current or high frequency power source is connected between the plasma torch body 23 and the cathode rod 25, and the nitrogen gas inlet 29
If nitrogen is supplied through, nitrogen molecules are decomposed into electrons and cations to create high temperature plasma. And torch body 2
When the exhaust gas containing pollutants such as dioxins and dioxin precursors flows into the reaction chamber 24 formed in the lower part of 3, through the exhaust gas inlet 26, the above-mentioned high temperature plasma flame 27 decomposes these organic compounds. Then, the high-temperature exhaust gas discharged from the reaction chamber 24 is cooled by the cooling water sprayed from the cooling water nozzle 33 installed adjacent to the plasma torch 20. Therefore, the plasma torch 20
The exhaust gas discharged from the tank is rapidly cooled to 200 ° C or lower, more preferably 100 ° C or lower. Therefore, the present invention prevents the generation of dioxins and nitrogen oxides that may be generated by the exhaust gas staying in a high temperature in a specific temperature range for a predetermined time or longer.

On the other hand, FIG. 5 shows a partition plate separately provided with a reaction chamber 24 in which exhaust gas containing pollutants is decomposed by plasma gas and a cooling and washing chamber 30 in which high-temperature exhaust gas is cooled and washed with cooling water. It shows the case of partitioning by. The dioxin and dust removing apparatus 10 using high temperature plasma according to the present invention shown in FIG. 5 is thermochemically composed of a high temperature plasma torch 20 for generating high temperature plasma and a reaction chamber 24 provided under the high temperature plasma torch 20. The exhaust gas discharged to a high temperature after being decomposed into water is quickly cooled, and at the same time, a cooling and cleaning chamber 30 provided with a cooling water nozzle 33 for cleaning contaminants is generated, and the cooling and cleaning chamber 30 is generated. Demister for removing water
r) 40, a cooling and washing chamber 30, and a storage tank 50 for primarily storing the cooling wastewater generated from the demister 40. That is, the high-temperature exhaust gas thermally decomposed in the reaction chamber 24 quickly flows into the cooling and cleaning chamber 30 and is cooled by the cooling water. At this time, since the exhaust gas is forcibly transferred by a blower (not shown), the cooling and cleaning chamber 30
The water generated in step 2 will not flow into the reaction chamber 24.

6 and 7 are sectional views showing another embodiment of the dioxin and dust removing device using high temperature plasma according to the present invention. As shown in FIGS. 6 and 7, in this embodiment, the reaction chamber 60 for decomposing pollutants by using high temperature plasma and the cooling and washing chamber 90 for cooling and washing exhaust gas by using cooling water are waste incineration. The case where the duct of the facility is provided in-line is shown.

That is, the reaction chamber 60 is provided so that the exhaust gas generated from the incinerator can flow in, and at least one high temperature plasma torch 20 is provided. Therefore, the reaction chamber 60 is maintained at at least 900 ° C. or higher, and more preferably 1500 ° C. or higher. In particular, since the reaction chamber 60 of this embodiment is provided outside the high temperature plasma torch 20, a large number of plasma torches 20 are suitable so that the exhaust gas passing through the reaction chamber 60 can make sufficient contact with the high temperature plasma flame. Distribute to. For example, in FIG. 6, a large number of plasma torches 20 are installed in a crossed manner so that the temperature inside the reaction chamber 60 is uniform, and in FIG. The thermal decomposition reaction is promoted by stirring the exhaust gas and causing a cyclone phenomenon.

The reaction chamber 60 is made of a heat-resistant material that can withstand a high temperature of 1500 ° C. or higher, and in FIG. 7, another cooling device 63 for protecting the inner wall of the reaction chamber 60 is provided outside the reaction chamber 60. Further, the size and shape of the reaction chamber 60 can be appropriately selected by an expert in the relevant field according to the emission amount of the incinerator exhaust gas to be treated. Then, the cooling and cleaning chamber 90 is installed adjacent to the reaction chamber 60 so that the hot exhaust gas can be rapidly moved and cooled. The exhaust gas is transferred by a blower and a suction fan (not shown). The cooling and cleaning chamber 90 cools high-temperature exhaust gas by using latent heat when liquid is vaporized into gas, and a large number of cooling water nozzles 33 for ejecting cooling water as fine water droplets are provided. It is provided. Therefore, the exhaust gas discharged at 900 ° C. or higher is rapidly cooled to 200 ° C. or lower, more preferably 100 ° C. or lower while passing through the cooling and cleaning chamber 90.

On the other hand, contaminants such as sulfates and dust contained in the exhaust gas are washed by the cooling water sprayed from the cooling water nozzle 33 while passing through the cooling and washing chamber 90. That is, since inorganic pollutants such as sulfates are not decomposed in the reaction chamber 60, all the pollutants contained in the exhaust gas can be removed by washing and removing them. Since the exhaust gas discharged from the cooling and cleaning chamber 90 contains a large amount of water, a demister 40 is provided at the rear end of the cooling and cleaning chamber 90 to separate the water. Then, the cooling wastewater generated from the cooling and washing chamber 90 and the demister 40 is discharged through the cooling wastewater recovery unit 53 and the discharge pipe 55 provided in the lower part.

Experimental examples of the dioxin and dust removing device using high temperature plasma according to the present invention will be described below. (1) Structure of Experimental Device In this experimental example, a plasma gas generated while passing a plasma emission region at 18 l / min using the dioxin and dust removing device using high temperature plasma according to the present invention shown in FIG. The exhaust gas containing dioxin was mixed. Nitrogen (N ₂ ) is used as a gas to be used, and cooling water is used to cool the electrodes in the plasma emission region with water. Exhaust gas passing through the plasma emission region generates nitrogen oxides due to high temperature and dioxins are resynthesized. Cooling water was sprayed through the nozzle to prevent spillage.

(2) Experimental method In order to measure the dioxin efficiency of the high temperature plasma reactor, the flow rate of the exhaust gas containing dioxin in the incineration facility is 2
It was sampled at a flow rate of 100 l / min and allowed to flow into the high temperature plasma reaction chamber, and the dioxin concentration was measured twice at the rear end of the reaction chamber when plasma was activated (on) and when plasma was not activated (off). The power used when operating the plasma was 7.1 kw. And the measuring method of the dioxin concentration was implemented based on "Air pollution process test method Paragraph 29".

(3) Experimental Results The following table shows the dioxin measurement results. Measurement efficiency is 9
Appeared at 7.2%.

[Table 1]

Generally, the temperature of the high temperature plasma emission region is 1
Since the temperature becomes 2,000 K or higher, the high temperature plasma processing apparatus can completely destroy dioxin decomposed at about 900 ° C. or higher. Moreover, since the unburned dust contained in the exhaust gas is completely burned at high temperature, the amount of by-products generated is small.

As described above, the device for removing dioxin and dust using high temperature plasma according to the present invention can remove 92% or more of dioxin, dust and various environmental pollutants generated in the incomplete combustion process. Not only incineration facilities that incinerate but also various industrial facilities, such as industrial waste incinerators, waste plastic pyrolysis facilities, steel mills,
It can also be applied to treat exhaust gas discharged from refinery facilities.

[0041]

As described above, the method and apparatus for removing dioxin and dust using high temperature plasma according to the present invention uses high temperature plasma to remove contaminants such as dioxin contained in the exhaust gas of a waste incinerator. In addition to complete combustion, the exhaust gas is rapidly cooled and washed so that the dioxin precursor contained in the exhaust gas is prevented from being resynthesized and nitrogen oxides are generated. It has the effect of removing various pollutants such as sulfates and dust.

Further, unlike the prior art, the present invention does not use limestone, activated carbon, etc., but completely burns dust contained in the exhaust gas by using high temperature plasma, and produces a very small amount of by-products. Therefore, a post-treatment process such as a dust collector can be omitted, so that there is an effect that installation cost is reduced and operation and maintenance are facilitated.

[Brief description of drawings]

FIG. 1 is a schematic process diagram showing a method for removing dioxins and dust using high temperature plasma according to the present invention.

FIG. 2 is a schematic sectional view showing an embodiment of a high temperature plasma torch according to the present invention.

FIG. 3 is a schematic sectional view showing a high temperature plasma torch according to the present invention provided at an exhaust port of an incineration facility.

FIG. 4 is a sectional view showing an embodiment of a dioxin and dust removing device using high temperature plasma according to the present invention.

FIG. 5 is a cross-sectional view showing a case where a reaction chamber and a cooling / cleaning chamber are partitioned in an embodiment of the dioxin and dust removing device using high temperature plasma according to the present invention.

FIG. 6 is a schematic cross-sectional view showing a case where a large number of plasma torches are cross-installed in another embodiment of the dioxin and dust removing apparatus using high temperature plasma according to the present invention.

FIG. 7 is a schematic cross-sectional view showing a case where a large number of plasma torches are installed in an inclined manner in another embodiment of the dioxin and dust removing apparatus using high temperature plasma according to the present invention.

[Explanation of symbols]

10 Dioxin and Dust Removal Device Using High Temperature Plasma 20 High Temperature Plasma Torch 23 Torch Body 24 Reaction Chamber 25 Cathode Rod 26 Exhaust Gas Inlet 27 Plasma Flame 28 Cooling Water Injecting Port 29 Nitrogen Gas Injecting Port 30 Cooling and Cleaning Chamber 33 Cooling Water Nozzle 37 Exhaust Port 40 Demister 50 Storage Tank 53 Cooling Wastewater Recovery Section 55 Exhaust Pipe 60 Reaction Chamber 63 Cooling Device 90 Cooling and Washing Room 100 Decomposition Stage 200 Cleaning Stage 300 Moisture Removal Stage 400 Cooling Wastewater Drainage Stage

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 53/68 B01D 53/34 134E 53/77 134B B01J 19/08 ZAB 125K H05H 1/30 127A 1/32 (72) Inventor Liu Ai, Korea 155, Seongbok-dong, Seongbuk-dong, Gyeonggi-do, Republic of Korea Elgy Village Primary 115 Building 1802 F term (reference) 4D002 AA02 AA03 AA19 AA21 AC04 BA02 BA05 BA07 BA13 BA14 BA16 CA01 CA13 DA35 GA01 GB03 4D032 AC01 BA06 4D058 JA12 KC04 QA05 RA11 SA15 SA20 TA02 UA03 4G075 AA03 AA37 BA05 CA03 CA48 DA01 EA02 EB21 EC21 FC06

Claims (11)

[Claims] 1. In a waste incineration facility, dioxin, soot, produced in an incinerator of the incinerator,
A decomposition step in which exhaust gas containing dust and incompletely combusted substances is thermochemically destroyed using high temperature plasma, and the high temperature exhaust gas generated from the decomposition step is rapidly cooled, and at the same time, pollution contained in the exhaust gas A cooling and washing step of washing the substance, a moisture removing step of removing the moisture contained in the exhaust gas cooled in the cooling and washing step, a cooling water used in the cooling and washing step and the moisture removing step. A method for removing dioxin and dust using high temperature plasma, comprising: a cooling wastewater drainage stage for discharging condensed cooling wastewater. 2. The method for removing dioxin and dust using high temperature plasma according to claim 1, wherein the decomposition step is maintained at 900 ° C. or higher using high temperature plasma. 3. The method for removing dioxin and dust using high temperature plasma according to claim 1, wherein in the cooling and cleaning step, the sprayed cooling water is used to rapidly lower the temperature to 200 ° C. or lower. 4. In a waste incineration facility, a reaction chamber into which exhaust gas containing dioxins and dioxin precursors, fly ash and incompletely combusted substances generated from the incinerator of the incinerator is introduced, and the reaction chamber. A high temperature plasma torch provided on one side of the reaction chamber in order to completely burn the exhaust gas that has flowed into the high temperature plasma, and the exhaust gas discharged from the reaction chamber is rapidly cooled to re-synthesize dioxin. A cooling and washing chamber in which a large number of cooling water nozzles are formed so as to prevent the formation of nitrogen oxides and at the same time wash hydrogen sulfide, sulfates and dust contained in the exhaust gas; A demister for removing the water contained in the exhaust gas discharged from the cleaning chamber, and a cooling wastewater generated from the cooling and cleaning chamber and the demister. Dioxins and dust removing device using a high temperature plasma, characterized in that it is constituted by a cooling waste water draining means for. 5. The high temperature plasma torch uses a direct current arc discharge or a high frequency inductively coupled discharge to ionize nitrogen gas (N ₂ ) to produce a high temperature plasma flame at 900 ° C. or higher. Dioxin and dust removal device using high temperature plasma of. 6. The high temperature plasma torch comprises a torch body made of a hollow tube, a cathode rod provided inside the torch body, and a nitrogen gas formed so that nitrogen gas can be injected into the torch body. The cooling water circulated inside the hollow tube of the main body, and a power supply means for supplying power to the torch main body and the cathode rod. A dioxin and dust removing device using the high temperature plasma described in 1. 7. In a waste incineration facility, waste, etc., so that exhaust gas containing dioxin and dioxin precursors, fly ash, and incompletely burned substances generated from the incinerator of the incinerator can flow in. A reaction chamber provided in a duct of an incineration facility in-line and provided with a number of high-temperature plasma torches so that the inflowing exhaust gas can be completely burned, and is installed adjacent to the reaction chamber, The exhaust gas discharged from the reaction chamber is rapidly cooled, and at the same time, the cooling and cleaning chamber is formed with a number of cooling water nozzles for cleaning contaminants contained in the exhaust gas; and the cooling and cleaning chamber is discharged. A demister for removing the water contained in the generated exhaust gas, and for discharging the cooling wastewater generated from the cooling and washing chamber and the demister Dioxins and dust removing device using a high temperature plasma, characterized in that it is constituted by a 却廃 water discharge means. 8. The device for removing dioxin and dust using high temperature plasma according to claim 7, wherein the reaction chamber is maintained at a temperature of at least 900 ° C. or higher. 9. A plurality of plasma torches provided in the reaction chamber are cross-installed to make the temperature inside the reaction chamber uniform, and the plurality of plasma torches are tilted to stir the inflowing exhaust gas. The dioxin and dust removing device using the high temperature plasma according to claim 7. 10. The reaction chamber is made of a heat-resistant material capable of withstanding high temperatures, and a cooling device for protecting the inner wall of the reaction chamber is provided outside the reaction chamber.
A dioxin and dust removing device using the high temperature plasma described in 1. 11. The high temperature plasma according to claim 7, wherein the exhaust gas is rapidly lowered to 200 ° C. or lower by finely injecting cooling water from a plurality of cooling water nozzles provided in the cooling and cleaning chamber. Dioxin and dust removing device using.