WO2016013759A1

WO2016013759A1 - Method for treating waste by using plasma pyrolysis

Info

Publication number: WO2016013759A1
Application number: PCT/KR2015/005761
Authority: WO
Inventors: 박재형
Original assignee: 주식회사 창원이앤이; 박재형
Priority date: 2014-07-21
Filing date: 2015-06-09
Publication date: 2016-01-28
Also published as: KR101456258B1

Abstract

A method for treating waste by using plasma pyrolysis, of the present invention, comprises the steps of: supplying a plasma heat source into a reaction chamber in which a material to be treated is accommodated; generating carbon monoxide and oxygen by supplying a gasification agent into the reaction chamber; and pyrolyzing the generated oxygen and the material to be treated, wherein the material to be treated contains carbon, the inner temperature of the reaction chamber is maintained at approximately 950°C or higher, and the gasification agent comprises carbon dioxide, nitrogen and argon in a ratio of approximately 1 : 0.1-1 : 0.1-0.5 by volume.

Description

Waste treatment method using plasma pyrolysis

The present invention relates to a waste treatment method using plasma pyrolysis. More particularly, the present invention relates to a waste treatment method using plasma pyrolysis that can stably pyrolyze a material to be treated in a pyrolysis reaction chamber by applying a plasma and a specific gasification agent.

In general, the thermal treatment method is used to treat the waste, the incineration method is the most used. This type of incineration risks the release of toxic substances (dioxin, furan, chlorine, sulfuric acid and mercury) into the atmosphere due to the disadvantage that the incineration temperature cannot be raised too high due to environmental regulations and costs. In addition, there is a problem of causing secondary pollution in soil and groundwater during reclamation because harmful substances such as heavy metals remain among unburned inorganic materials. Recently, research on pyrolysis and melting system has been actively conducted to solve such problems. ought.

Plasma is a state of a material obtained at a high temperature of several thousand degrees or more by an electric discharge method, and means a state in which molecules or valent ions and electrons are separated. Since the plasma is an ionized gas state, particle acceleration by electric field or the like is easy, so that heating to a high temperature is easy and ultra-high temperatures of hundreds of millions or more can be obtained. In particular, a plasma torch that generates plasma at atmospheric pressure is an apparatus that generates high-temperature plasma by ionizing gas at an arc or high frequency, and thus, a system using a plasma torch has to be treated among various pyrolysis melting systems. Since the amount of emitted gas is only one seventh of the existing incinerator, it is possible to drastically reduce the size of the facility. The temperature inside the flame generated by the plasma torch is at least 10,000 ° C, and the temperature outside the flame is also at least about 3,000 ° C. Due to such a high temperature, a gas having a very high enthalpy is obtained, which is very effective for heating the pyrolysis reaction chamber, and is used for treating various wastes. On the other hand, if the pyrolysis gasification reaction chamber does not supply any oxygen source from the outside, oxygen contained in the target material inside the reaction chamber reacts with carbon, hydrogen, and other substances in the target material, thereby reducing carbon monoxide (CO) or water vapor (H ₂ O). It is consumed as it is converted to lamps, and eventually depleted, leaving only carbon content. Therefore, an appropriate oxygen source is needed to prevent the phenomenon of charcoal and to induce a smooth gasification reaction. At this time, the gasifier supplied from the outside is injected from the outside to act as an oxygen source.

As such an oxygen source, until now, the industry mainly uses air, steam (pyrolyzed and decomposed into H ₂ and O ₂ ), or oxygen. If oxygen is directly supplied, the target material of the reaction chamber is explosive or highly oxidizing. In the case of metal, serious safety problems may occur. If the object has a very high affinity with oxygen, it reacts with the metal before the carbon monoxide is formed and reacts with the metal before it is converted into metal oxide.

On the other hand, the Republic of Korea Patent Publication No. 2012-0033682 relates to a waste polymer insulator processing apparatus and method, according to the present invention is a device for thermal decomposition of the waste polymer insulator; A plasma apparatus connected to the pyrolysis apparatus to supply plasma to the pyrolysis gas generated in the pyrolysis apparatus; A gasification reaction device connected to the plasma apparatus to generate a gasification reaction of the pyrolysis gas; A cooling device connected to the gasification reaction device to cool the gas obtained by the gasification reaction; A cleaning device connected to the cooling device to purify the cooled gas; And a gas recovery device connected to the cleaning device to recover the purified gas.

An object of the present invention is to provide a waste disposal method using plasma pyrolysis, which is excellent in stability and can easily control the waste disposal rate.

Another object of the present invention is to provide a waste disposal method excellent in environmentally friendly effects.

Still another object of the present invention is to provide a waste treatment method using plasma pyrolysis capable of preventing oxidation of metal components contained in the waste.

Still another object of the present invention is to provide a waste treatment method using plasma pyrolysis having excellent recovery of metals contained in the waste.

One aspect of the present invention relates to a waste treatment method using plasma pyrolysis. In the embodiment, the waste treatment method using plasma pyrolysis may include supplying a plasma heat source into a reaction chamber containing a material to be treated; Supplying a gasifying agent into the reaction chamber to generate carbon monoxide and oxygen; And pyrolyzing the generated oxygen and the material to be treated, wherein the material to be treated includes carbon, the internal temperature of the reaction chamber is maintained at about 950 ° C. or more, and the gasifier is carbon dioxide, And nitrogen and argon in a volume ratio of about 1: 0.1 to 1: 0.1 to 0.5.

In one embodiment, the gasifier is supplied into the reaction chamber at a pressure of about 1 bar to about 50 bar and a flow rate of about 5 slpm to about 60 slpm (standard liters per minute).

In one embodiment, the gasifier is supplied into the reaction chamber through a gasifier delivery pipe.

In one embodiment, the carbon dioxide included in the gasification agent is characterized in that to reuse the carbon dioxide generated by the reaction of the carbon monoxide and oxygen in the reaction chamber in the thermal decomposition step.

In one embodiment, the material to be treated further includes one or more of aluminum, magnesium, zinc, titanium, and oxides thereof.

When applying the waste treatment method using the plasma pyrolysis according to the present invention, it is excellent in stability by minimizing the risk that the material to be treated rapidly reacts with oxygen and explodes in the reaction chamber, and uses carbon dioxide as a gasifier, It is possible to recycle carbon dioxide generated in the waste treatment process, so it is excellent in eco-friendly effect, can easily control the waste disposal rate, prevents oxidation of the metal components included in the material to be treated, and has excellent recovery rate of metal contained in the waste. Excellent economic effect.

1 shows a plasma pyrolysis apparatus according to an embodiment of the present invention.

In the following description of the present invention, when it is determined that detailed descriptions of related well-known technologies or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

The terms to be described below are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators, and the definitions should be made based on the contents throughout the present specification for describing the present invention.

In the present specification, the "subject material" may mean "waste".

One aspect of the present invention relates to a waste treatment method using plasma pyrolysis. In one embodiment the waste treatment method using the plasma pyrolysis (a) pretreatment step; (b) inflow of the substance to be treated; (c) a plasma heat source supplying step; (d) gasification reaction step; And (e) a pyrolysis step.

In one embodiment, a waste treatment method using plasma pyrolysis may include supplying a plasma heat source into a reaction chamber containing a material to be treated; Supplying a gasifying agent into the reaction chamber to generate carbon monoxide and oxygen; And pyrolyzing the generated oxygen with the treatment target material.

1 shows a plasma pyrolysis apparatus according to an embodiment of the present invention. Referring to FIG. 1, the plasma pyrolysis apparatus 1000 includes an inlet 20 through which an object to be treated 40 is introduced, and an object to be introduced into the reaction chamber 30 through an inlet pipe 22; A reaction chamber 30 which thermally decomposes the treatment target material 40 introduced through the inlet pipe 22 using a plasma and a gasifier; A gasifier supply unit 50 for supplying a gasifier into the reaction chamber 30 through the gasifier supply pipe 52; And a gas collecting unit 60 collecting gas generated in the reaction chamber 30 during the thermal decomposition through a gas discharge pipe 62. The reaction chamber 30 includes a plasma torch 10 for supplying plasma. ; A solid treatment material generated after the thermal decomposition treatment of the treatment target material 40 with the treatment material outlet 32; And a thermometer 34 measuring an internal temperature of the reaction chamber 30.

Hereinafter, the waste treatment method using plasma pyrolysis according to the present invention will be described in detail step by step.

(a) pretreatment step

The step is a step of pretreating the material 40 to be treated before entering the inlet 20. In embodiments, the pretreatment step includes the steps of: cleaning the material to be treated; Drying the cleaned material; And pulverizing the dried material to be treated.

In an embodiment, the substance to be treated is introduced into a washing machine (not shown) to remove foreign substances using water and a detergent, and the substance to be removed is transferred to a dryer (not shown) and dried to remove moisture. Remove and transfer the dried object to a pulverizer (not shown) to pulverize (chop) it into a predetermined size and pretreat it to the inlet 20 and the pretreated treatment through the inlet pipe 22. The target material may be introduced into the reaction chamber 30.

In embodiments, the treatment material may be ground to a size of about 0.1mm to about 5mm. In the present specification, "size" of the material to be treated is defined as meaning "longest length".

As described above, when pretreatment of the material to be treated, including the cleaning step, the drying step, and the crushing step, foreign substances contained in the material to be treated are easily removed, and the weight per unit volume of the material to be treated is more efficient. Processing can be performed. In another embodiment, foreign matter attached to the material to be treated may be removed using magnetic or rotational force at the inlet.

(b) Inflow stage of treatment material

In this step, the material to be treated is introduced into the reaction chamber 30 included in the plasma pyrolysis apparatus 1000.

In one embodiment, the material to be treated includes carbon, and the gasification agent to be described below is treated by reacting with oxygen generated by decomposition of the plasma in the reaction chamber. In another embodiment, the material to be treated may include at least one metal component among aluminum, magnesium, zinc, titanium, and oxides thereof.

When pyrolysis treatment of the treatment target material 40 including the metal component as described above, oxygen is not generated in the initial stage of the reaction, and thus the metal components included in the treatment target material 40 in the reaction chamber 30 are initially separated from oxygen. The reaction may be prevented from being oxidized, and carbon and oxygen may react to easily recover the metal component during thermal decomposition of the material 40 to be treated, and thus may have an excellent economic effect.

In a specific embodiment, a package including synthetic resin containing carbon, aluminum (Al), and aluminum oxide (Al ₂ O ₃ , Al ₂ O ₄ ) may be used as the material 40 to be treated. The synthetic resin may include polypropylene (polyprophylene) and polyethylene (polyethylene). On the other hand, the packaging material, such as packaging for snacks and coffee mixes laminated aluminum of about 10 ㎛ to about 50 ㎛ thickness on a synthetic resin substrate such as polypropylene or polyethylene of about 100 ㎛ to about 500 ㎛ thick, An oxide film, that is, an aluminum oxide (alumina) layer formed by contact with air is formed on the surface, and is formed by using a dense surface structure and an antioxidant layer.

(c) plasma heat source supply step

The step is injecting a plasma heat source through the plasma torch 10 into the reaction chamber 30 containing the material to be treated 40.

In the present invention, the plasma torch 10 may be a conventional one. The plasma torch 10 generates electrical energy as an arc and converts the thermal energy into thermal energy, thereby continuously supplying thermal energy into the reaction chamber 30 due to plasma generation, thereby raising the temperature inside the reaction chamber 30 to a temperature of about 950 ° C. or more. It serves to advance the pyrolysis reaction.

The gas supplied to the plasma torch 10 depends on the structure of the plasma torch forming the DC arc, but in one embodiment, one or more selected from inert gas, nitrogen, air and steam may be used. In other embodiments, one or more of helium and argon may be selected and used. When using helium and argon gas can generate a higher temperature.

(d) gasifier supply stage

In this step, the gasification agent is supplied into the reaction chamber 30 in which the treatment target material 40 is accommodated to generate carbon monoxide and oxygen. In the present invention, the carbon dioxide included in the gasifier generates carbon monoxide and oxygen by a reaction as shown in Equation 1 below at a temperature of about 950 ° C. or higher:

[Equation 1]

In the present invention, the gasifier comprises carbon dioxide, nitrogen and argon in a volume ratio of about 1: 0.1 to 1: 0.1 to 0.5. When included in the volume ratio, it is possible to easily control the reaction treatment speed, to maintain a stable inside the reaction chamber is more excellent in the stability during treatment, if the material to be treated with a highly oxidizing metal, to minimize the formation of metal oxide Therefore, the recovery rate of the metal may be excellent and the economic effect may be excellent. With respect to the carbon dioxide, when the nitrogen is contained in less than about 0.1 volume ratio relative to the carbon dioxide volume, the inside of the reaction chamber is unstable to increase the explosion risk, the nitrogen is greater than about 1 volume ratio relative to the carbon dioxide volume When included, the waste treatment reaction is difficult to proceed easily. In addition, when the argon is contained in less than about 0.1% by volume relative to the carbon dioxide volume, the inside of the reaction chamber is unstable to increase the explosion risk, the argon is about 0.5% by volume relative to the carbon dioxide volume When included in excess, the reaction chamber internal temperature is excessively increased so that the recovery rate may be lowered when the metal component is included.

For example, the gasification agent may include carbon dioxide, nitrogen, and argon in a volume ratio of about 1: 0.5 to 1: 0.1 to 0.3. When included in the volume ratio to maintain a stable inside the reaction chamber, the recovery rate of the metal may be excellent.

The reaction chamber 30 in which the waste treatment reaction of the present invention proceeds maintains the internal temperature at about 950 ° C. or more during the waste treatment reaction. When the internal temperature of the reaction chamber 30 is less than about 950 ° C, the reaction of Equation 1 does not occur. For example, the temperature inside the reaction chamber 30 may be maintained at about 950 ° C to about 1,900 ° C. In embodiments, it may be maintained from about 1,350 ℃ to about 1,800 ℃. Carbon monoxide and oxygen generated in the gasifier at the temperature range of the above range is generated by the reaction of the formula 1 to facilitate the pyrolysis reaction of the waste, the pyrolysis reaction containing the above-described carbon and metal components easily Can be done. When the internal temperature of the reaction chamber 30 is less than about 950 ° C, the reaction of Equation 1 does not occur.

When carbon dioxide is included in the gasification agent as described above, oxygen may rapidly react with the material to be treated and explode at the initial stage of the pyrolysis reaction, and thus it may be stably treated during thermal decomposition of the material to be exploded. In particular, the existing gasification agent mainly used oxygen and steam. When using such a gasification agent, the initial reaction is performed when the material to be treated contains carbon and one or more oxidizing metal components among aluminum, magnesium, zinc and titanium. Since oxygen and metal components react to form metal oxides, the metal recovery rate contained in the material to be treated has been greatly reduced. However, when carbon dioxide is used as a gasification agent, oxygen and metal components do not react from the beginning of the reaction. It is possible to increase the metal recovery rate, so the stability and economic effect of the reaction are excellent.

In one embodiment, the gasifier may be supplied at a temperature of about 350 ° C or more. For example, it may be supplied at a temperature of about 350 ℃ to about 800 ℃. When supplied at the temperature, it is possible to easily proceed with the pyrolysis reaction by preventing a sudden temperature drop inside the reaction chamber (30).

In addition, the gasifier may be supplied into the reaction chamber at a pressure of about 1 bar to about 50 bar and a flow rate of about 5 slpm to about 60 slpm (standard liters per minute). When the gasification agent is supplied under the pressure and flow rate conditions, it is possible to easily control the pyrolysis rate while preventing the gasification agent from rapidly reacting and exploding.

In embodiments, the gasifier may further comprise one or more inert gases from nitrogen, argon and helium. When further comprising the gas of the kind, to prevent the rapid initial reaction of the oxygen and the target material 40 generated from the carbon dioxide of the gasifier, the stability during the pyrolysis reaction is more excellent, the target material 40 The reaction rate of pyrolysis of and oxygen can also be easily controlled.

In another embodiment the gasifier may further comprise helium. In embodiments, carbon dioxide, carbon, nitrogen, argon, and helium may be included in a volume ratio of about 1: 0.1 to 1: 0.1 to 0.5: 0.01 to 0.1. When included in the volume ratio, it is possible to easily control the reaction treatment rate, the reaction stability is more excellent, the recovery rate of the metal can be excellent and the economic effect can be excellent. For example, it may be included in a volume ratio of about 1: 0.5 to 1: 0.1 to 0.3: 0.01 to 0.5.

Referring to FIG. 1, in one embodiment, the gasifier is supplied from the gasifier supply unit 50, and may be supplied into the reaction chamber 30 through the gasifier transfer pipe 52. In another embodiment, the gasifier may be supplied into the reaction chamber 30 together with the plasma through the plasma torch 10.

(e) pyrolysis step

The step is to thermally decompose the material to be treated in the reaction chamber using oxygen generated in the plasma and gasifier reaction steps.

In an embodiment, the material 40 to be treated with carbon reacts with the generated oxygen as shown in Equation 2 to generate a partial combustion reaction to generate a gasification reaction, thereby pyrolyzing:

[Equation 2]

That is, the injected treatment target material may be thermally decomposed by oxygen as in Equation 2 to generate a synthesis gas and a treatment material. The treatment material may be in a liquid state or a solid state. For example, carbon-containing components (eg, cellulose or olefin-based high molecular compounds) in the object to be treated are thermally decomposed to form molecules (molecular dissociation), and thus, carbon monoxide (CO) and hydrogen (H ₂ ) at high temperatures. Reducing syngas, including the like, and liquid or solid impurities may be generated.

Referring to FIG. 1, the generated syngas is transferred to a gas collecting unit 60 through a gas discharge pipe 62 and recovered, and the generated processed material remains at the lower end of the reaction chamber 30. It may be recovered through the treatment material outlet 32 located at the lower end of the reaction chamber (30).

In embodiments, when the material to be treated includes synthetic resin, aluminum (Al) and aluminum oxide (Al ₂ O ₃ , Al ₂ O ₄ ), the synthetic resin is thermally decomposed to carbon monoxide (CO) and hydrogen (H ₂ ), etc. Reducing syngas is produced. The aluminum is thermally decomposed by the generated oxygen and disposed below the inside of the reaction chamber 30. That is, while the temperature of the reaction chamber 30 is maintained at a temperature of about 950 ° C. or more, for example, about 950 ° C. to about 1,900 ° C. by the continuous heat source, the aluminum is melted to the bottom of the reaction chamber 30. It is accommodated and discharged to the treatment material outlet 32 so that it can be easily recovered.

In addition, the aluminum oxide is formed by the synthesis gas, such as carbon monoxide (CO) and hydrogen (H ₂ ) generated during the pyrolysis of the synthetic resin is formed in the reducing atmosphere in the reaction chamber 30, the plasma heat source is continuously supplied By the endothermic reaction is formed, it is reduced to aluminum through a reaction process such as the following Equation 3 or 4, to produce gases such as carbon dioxide (CO ₂ ) and water vapor (H ₂ O):

[Equation 3]

[Equation 4]

All of the above reaction processes are endothermic, and the enthalpy of formation of each material is Al ₂ O ₃ = -387.1865 Kcal / mol, Al ₂ = 0 Kcal / mol, H ₂ = 0 Kcal / mol, CO = -26.407 Kcal / mol, CO ₂ = -94.1 kcal / mol, H ₂ O = -57.8 kcal / mol, the molecular weight of Al ₂ O ₃ is 101.96 g / mol, the molecular weight of Al ₂ is 53.96 g / mol, E1 = -193.98 kcal / mol, and E2 of the formula (4) is -203.87 kcal / mol. The reaction process represented by Equation 3 and Equation 4 is proportional to the concentrations of carbon monoxide (CO) and hydrogen (H ₂ ), and under the same environment, each reaction is approximately 50:50 because they have the same to similar values. This can be seen as done. Therefore, for these endothermic reactions, an average E = -198.925 kcal / mol can be calculated, and an energy of approximately 198.925 kcal is required to reduce aluminum oxide to aluminum per mol, so considering the molecular weight of each alumina (Al ₂ O ₃ ) Approximately 2000 kcal of energy is required per kilogram, which can recover about 0.529 kg of aluminum (Al). That is, by appropriately adjusting the volume ratio of CO and H ₂ generated through the plasma pyrolysis gasification process included in the material to be treated, the reduction process of aluminum oxide under a predetermined reducing atmosphere may be performed and the thermal decomposition of aluminum oxide may be smoothly performed. . Through such a reduction melting process, while maximizing the recovery of aluminum from the packaging material containing aluminum while supplying excessive energy, the efficiency of resource recovery can be increased.

Synthetic gas such as CO ₂ and H ₂ O generated during thermal decomposition of the metal oxide such as aluminum oxide is also transferred to the gas collection unit 60 through the gas discharge pipe 62 and recovered as described above. The treatment material including the remains at the lower end of the reaction chamber 30, it may be recovered through the treatment material outlet 32 located at the lower end of the reaction chamber (30).

In embodiments, the carbon dioxide (CO ₂ ), water vapor (H ₂ O), carbon monoxide (CO) and hydrogen (H ₂ ) syngas may cool the temperature below about 200 ° C. before being used for gas engine or turbine power generation, and the like. . Cooling to this temperature allows, for example, the partially combusted components of carbon monoxide to be burned completely and efficiently. In another embodiment, further comprising a heat exchanger (not shown) connected to the gas collecting unit 60, if the heat of the syngas is transferred to another type of gas and cooled, the gas receiving the heat of the syngas May be used to heat a steam turbine or the like for additional power production.

On the other hand, the carbon dioxide included in the gasifier may reuse the carbon dioxide generated by the reaction of the carbon monoxide and oxygen present in the reaction chamber in the thermal decomposition step.

In the pyrolysis step, by the reaction as shown in Equation 5, carbon monoxide included in the reaction chamber may react with the oxygen to generate carbon dioxide:

[Equation 5]

In this case, the carbon monoxide reacting with the oxygen may be generated from carbon dioxide included in the above-described gasification agent, or may be generated by reaction of carbon and oxygen during the thermal decomposition.

The carbon dioxide generated as shown in Equation 2 is transferred to the gas collecting unit 60 through the gas discharge pipe 62 and recovered as described above, and is purified by using a conventional method, and then the gasifier supply unit 50. Is transferred to the gasification feed pipe (52) to be fed back into the reaction chamber can be recycled. As described above, the economic effect of recycling carbon dioxide may be excellent.

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.

In addition, simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Examples and Comparative Examples

Example

The inlet 20 for introducing the treatment target material 40 as shown in FIG. 1 and introducing the treatment target material into the reaction chamber 30 through the inlet pipe 22; A gasifier supply unit 50 for supplying a gasifier into the reaction chamber 30 through the gasifier supply pipe 52; A gas collecting unit 60 collecting gas generated in the reaction chamber 30 during the thermal decomposition through a gas discharge pipe 62; And a plasma torch 10 for supplying plasma; A solid treatment material generated after the thermal decomposition treatment of the treatment target material 40 with the treatment material outlet 32; Reaction chamber 30 includes a thermometer (34) for measuring the internal temperature; the reaction chamber 30 for thermally decomposing the treatment target material 40 introduced through the inlet pipe 22 using a plasma and gasifier The pyrolysis reaction was performed using the plasma pyrolysis apparatus 1000 including the same.

1 kg of a packaging material containing 30 wt% of aluminum (Al), 15 wt% of aluminum oxides (Al ₂ O ₃ and Al ₂ O ₄ ) and 55 wt% of polyethylene as the material 40 to be treated is introduced into the inlet 20. , Was placed in the reaction chamber 30 through the inlet pipe 22 to accommodate. Using a plasma generated by supplying nitrogen gas to the plasma torch 10 forming the DC arc, the internal temperature of the reaction chamber 30 is maintained at 1,600 ° C while controlling the internal temperature of carbon dioxide, nitrogen, and argon as a gasification agent. The mixture was mixed at a volume ratio of: 0.3: 0.5 and supplied into the reaction chamber 30 at a temperature of 700 ° C., a pressure of 5 bar, and a flow rate of 30 slm. In the reaction chamber 30, the gasifier produced carbon monoxide and oxygen by the reaction of the following Equation 1:

[Equation 1]

By using the generated oxygen to thermally decompose the material to be treated 40 contained in the reaction chamber 30 by the following equation (2):

[Equation 2]

The polyethylene component of the material to be treated was pyrolyzed to produce reducible syngas such as carbon monoxide (CO) and hydrogen (H ₂ ). In addition, the aluminum included was thermally decomposed by the generated oxygen and accommodated in the bottom of the reaction chamber 30 to recover the treated material outlet 32.

In addition, the aluminum oxide is formed by a reducing atmosphere in the reaction chamber 30 formed by a synthesis gas such as carbon monoxide (CO) and hydrogen (H ₂ ) generated during the pyrolysis of the synthetic resin, and a plasma heat source continuously supplied. As the endothermic reaction was formed, aluminum and gases such as CO ₂ and H ₂ O were generated through a reaction process as in Equation 3 or 4 below. The aluminum was accommodated in the bottom of the reaction chamber 30 and recovered to the treatment material outlet 32. In addition, the generated gases such as CO ₂ , H ₂ O were transferred to the gas collecting unit 60 through the gas discharge pipe 62:

[Equation 3]

[Equation 4]

In addition, in the pyrolysis process, carbon monoxide in the reaction chamber 30 reacts with oxygen in the reaction chamber 30 to generate carbon dioxide, and the carbon dioxide is gas through the gas discharge pipe 62. After transported to the collecting unit 60, the collected and purified in the usual manner, and again supplied to the gasifier supply unit 50 and introduced into the reaction chamber 30 through the gasifier supply pipe 52 and reused:

[Equation 5]

Comparative Example 1

The material to be treated was pyrolyzed in the same manner as in Example 1 except that carbon dioxide, nitrogen, and argon were used in a gas ratio of 1: 2: 0.5.

Comparative Example 2

The material to be treated was pyrolyzed in the same manner as in Example 1 except that carbon dioxide, nitrogen, and argon were used in a volume ratio of 1: 0.3: 1 as the gasifier.

Comparative Example 3

The material to be treated was pyrolyzed in the same manner as in Example 1 except that steam (H ₂ 0) was used as the gasifier.

Comparative Example 4

The material to be treated was pyrolyzed in the same manner as in Example 1 except that oxygen (O ₂ ) was used as the gasifier.

The material to be thermally decomposed in Examples and Comparative Examples 1 to 4 was evaluated as follows, and is shown in Table 1 below.

(1) Recovered aluminum (g): The total weight of recovered aluminum (Al) in the pyrolyzed treatment target material was measured and shown in Table 1 below.

(2) Reaction stability: The reaction stability was evaluated by observing the inside of the reaction chamber during the reaction. When the reaction chamber was stably generated in the reaction chamber during the pyrolysis reaction, it was evaluated as ○, unstable △, and extremely unstable x.

Table 1

division	Example	Comparative example
division	Example	One	2	3	4
Recovered Aluminum (g)	193	131	134	138	139
Reaction Stability	○	△	△	×	×

Referring to Table 1 above, in the case of Comparative Examples 1 to 4 using the gasifier outside the mixing volume ratio of the present invention or using steam and oxygen, the recovery rate of the metal and the metal oxide contained in the waste compared to the embodiment of the present invention It was found that the deterioration and the explosion risk increased due to the instability of the inside of the reaction chamber during the pyrolysis reaction.

Claims

Supplying a plasma heat source into a reaction chamber containing a material to be treated;

Supplying a gasifying agent into the reaction chamber to generate carbon monoxide and oxygen; And

And pyrolyzing the generated oxygen with the treatment target material.

The material to be treated includes carbon,

The internal temperature of the reaction chamber is maintained at about 950 ℃ or more,

The gasification agent is a waste treatment method using plasma pyrolysis, characterized in that the carbon dioxide, nitrogen and argon in a volume ratio of about 1: 0.1 ~ 1: 0.1 ~ 0.5.
The plasma pyrolysis of claim 1, wherein the gasifier is supplied into the reaction chamber at a pressure of about 1 bar to about 50 bar and a flow rate of about 5 slpm to about 60 slpm (standard liters per minute). Waste treatment method using.
The method of claim 1, wherein the gasifier is supplied into the reaction chamber through a gasifier delivery tube.
The method of claim 1, wherein the carbon dioxide included in the gasification agent reuses carbon dioxide generated by reacting carbon monoxide and oxygen in the reaction chamber in the pyrolysis step.
The method of claim 1, wherein the treatment target material further comprises at least one of aluminum, magnesium, zinc, titanium, and oxides thereof.