Method for fixing carbon dioxide in exhaust gas, plasma catalyst generating device for capturing carbon dioxide in exhaust gas, and carbon dioxide fixing device of exhaust gas comprising the same

Abstract

Disclosed are a method for fixing carbon dioxide in exhaust gas, a plasma catalyst generation device for capturing carbon dioxide in exhaust gas, and a carbon dioxide fixing device for exhaust gas including the same. The method for fixing carbon dioxide in exhaust gas includes a first step of jetting a plasma with an alkali metal compound to form a plasma catalyst, and a second step of discharging the plasma catalyst to exhaust gas including carbon dioxide to capture the carbon dioxide in the exhaust gas.

Description

Technical Field

[0001] This invention relates to a method for fixing carbon dioxide in exhaust gas, a plasma catalyst generator for capturing carbon dioxide in exhaust gas, and a carbon dioxide fixing apparatus for exhaust gas containing the same, and more specifically to a method and apparatus for fixing carbon dioxide contained in large-volume exhaust gas from marine engines, etc. Background Technology

[0002] As is well known, carbon dioxide in exhaust gases is a major greenhouse gas contributing to environmental problems such as global warming, necessitating technologies to effectively mitigate these issues. One existing carbon dioxide reduction technology involves capturing and removing carbon dioxide through catalytic reactions. This method fixes carbon dioxide by passing exhaust gases through a catalytic reactor, generally suitable for treating small volumes of exhaust gas, but has limitations in treating large volumes of exhaust gas, such as from marine engines. Furthermore, existing catalytic systems consume significant energy to raise the temperature of the reaction section, resulting in low energy efficiency and making them difficult to apply on a large scale. Summary of the Invention

[0003] The purpose of this invention is to overcome the limitations of existing carbon dioxide fixation methods and provide a technology that can effectively fix carbon dioxide even in large-volume waste gases. To this end, a plasma catalyst injection device combining plasma technology and alkali metal compound catalysts to reduce carbon dioxide has been developed. The objective of this invention is to effectively remove carbon dioxide from large-scale waste gases by reacting carbon dioxide contained in the waste gas with alkali metal compounds activated in a plasma state, thereby minimizing energy consumption.

[0004] On one hand, the present invention provides a method for fixing carbon dioxide in exhaust gas, comprising: a first step of injecting an alkali metal compound into a plasma to form a plasma catalyst; and a second step of discharging the plasma catalyst as exhaust gas containing carbon dioxide to capture carbon dioxide in the exhaust gas.

[0005] In the context of this specification, alkali metal compounds, by way of non-limiting example, refer to compounds containing group 1 alkali metals such as sodium and potassium. These alkali metal compounds serve to capture and fix carbon dioxide in exhaust gases.

[0006] In the context of this specification, the plasma catalyst comprises the alkali metal compound activated in a plasma state, which reacts with carbon dioxide in the exhaust gas to be converted into carbonic or bicarbonate compounds, thereby helping to reduce carbon dioxide in the exhaust gas.

[0007] The plasma of the present invention is characterized by being an electromagnetic wave plasma torch that discharges plasma by injecting plasma source gas into a discharge tube that passes through an electromagnetic waveguide.

[0008] The alkali metal compound of the present invention is characterized in that the alkali metal compound in solid or liquid phase is supplied in powder form or aqueous solution.

[0009] The alkali metal compound of the present invention is characterized in that it is an alkali metal hydroxide. In this case, since the product becomes water, it is very environmentally friendly, and the hydroxide is readily soluble in water as hydroxide ions and alkali metal ions, thus having the advantage of being able to supply the acidic wastewater generated in the scrubbing tower as an aqueous solution to induce a neutralization reaction.

[0010] The alkali metal hydroxide of the present invention is characterized in that it is a solid or aqueous solution selected from one or more of the group consisting of NaOH and KOH.

[0011] The alkali metal compound injection of the present invention is characterized by being configured to be injected via a carrier gas. The carrier gas of the present invention is characterized by being steam. When injecting the alkali metal compound, high-pressure steam can be used to forcefully inject it, allowing it to penetrate into the plasma.

[0012] The plasma of the present invention is characterized in that it is a plasma containing a plasma source gas of vapor (H2O). In the case of vapor plasma, it is characterized by the presence of OH, which can act as a catalyst. , These substances exist at densities more than 10 times higher than those in existing vaporizers. Furthermore, it can prevent the recombination of ionized alkali metal compounds and induce the conversion to H₂O by generating additional H and O molecules.

[0013] The plasma source gas of the present invention is characterized by further containing oxygen (O2). In the case of oxygen plasma, by further adding vapor, it is possible to prevent the recombination of ionized alkali metal compounds and induce conversion to H2O by generating additional H, O, and other molecules.

[0014] Depending on the volume of waste gas or the concentration of CO2, steam can be additionally supplied to the waste gas containing carbon dioxide. This generates more OH radicals, thereby helping to improve the reactivity of carbon dioxide fixation. Furthermore, the additionally supplied steam is advantageous when using solid-phase catalysts. This is because the liquid-phase catalyst is dissolved in water, and therefore the aqueous solution itself can also act as steam.

[0015] The second step of the present invention is characterized by forming a compound containing bicarbonate or carbonic acid. The compound containing bicarbonate or carbonic acid is a byproduct of mixing and reacting a plasma catalyst with waste gas containing carbon dioxide, thereby fixing carbon dioxide in the waste gas and reducing its concentration. In addition to the compound containing bicarbonate or carbonic acid, H₂O may also be formed.

[0016] The bicarbonate or carbonic acid compound of the present invention may be one or more selected from the group consisting of NaHCO3, Na2CO3, KHCO3 and K2CO3.

[0017] The method of the present invention is characterized by fixing carbon dioxide contained in the large-volume exhaust gas of marine engines, etc. Existing catalytic methods involve passing exhaust gas containing carbon dioxide through a catalytic reactor and fixing it to the catalyst, but these methods consume a large amount of electrical energy to activate the catalyst by raising the temperature of the catalyst reaction section. Existing methods are feasible for small exhaust gas volumes, but are very difficult to use for large-volume exhaust gas from marine engines, etc. The present invention, through the above method, achieves this even for a minimum exhaust gas volume of approximately 100,000 Nm³. 3 The advantage is that it can also be used for large-capacity exhaust gases such as those from marine engines with a capacity of / hr.

[0018] On the other hand, the present invention provides a plasma catalyst generating device for capturing carbon dioxide in exhaust gas, comprising: an electromagnetic waveguide for transmitting electromagnetic waves; a quartz discharge tube penetrating the electromagnetic waveguide, forming plasma through the electromagnetic waves, and including a discharge outlet for discharging a plasma torch; a discharge gas injection section, wherein the quartz discharge tube sandwiches the electromagnetic waveguide in the middle, including a discharge outlet side where the discharge outlet is located and a discharge gas injection side opposite to the discharge outlet, for injecting plasma discharge gas into the quartz discharge tube located on the discharge gas injection side; and an alkali metal compound injection section located on the discharge outlet side for spraying alkali metal compounds into the plasma.

[0019] The plasma source gas of the present invention is characterized in that it comprises one or more gases selected from vapor (H2O) and oxygen.

[0020] The alkali metal compound injection unit of the present invention is characterized in that, in order to inject the alkali metal compound by means of a carrier gas, it includes a carrier gas injection line and an alkali metal compound injection line branching off from the carrier gas injection line.

[0021] The carrier gas of the present invention is characterized in that it is steam. When injecting alkali metal compounds, high-pressure steam can be used to forcefully inject them and allow them to penetrate into the plasma.

[0022] The invention is characterized in that, on the outlet side, there is one or more additional gas supply sections that extend through the quartz discharge tube to supply a gas containing vapor to the plasma. This generates more OH radicals, which helps to fix carbon dioxide.

[0023] In another aspect, the present invention provides a carbon dioxide fixation device for waste gas, comprising: a waste gas duct for through which waste gas containing carbon dioxide passes; and a plasma catalyst generator for capturing carbon dioxide in the waste gas, wherein the outlet is connected to the waste gas duct.

[0024] The carbon dioxide fixation device for waste gas of the present invention is characterized in that it includes two or more plasma catalyst generating devices, the two or more plasma catalyst generating devices being arranged radially so that the plasma torch is emitted toward the center of the waste gas pipe.

[0025] The carbon dioxide fixation device for waste gas of the present invention is characterized in that it includes two or more plasma catalyst generating devices, wherein the plasma catalyst generating devices are arranged in sections along the waste gas movement path of the waste gas pipeline and are arranged in a diagonal line in sequence.

[0026] The carbon dioxide fixation device for waste gas of the present invention is characterized in that it includes two or more plasma catalyst generating devices, wherein the discharge part of the plasma catalyst generating device passes through the waste gas pipeline, so that its plasma torch is discharged obliquely along the direction of the waste gas movement path of the waste gas pipeline. Invention Effects

[0027] According to the present invention, the carbon dioxide fixation method using plasma catalysts significantly improves energy efficiency compared to existing catalytic reaction methods, making it suitable for large-volume waste gas treatment. Alkali metal compounds ionized in a plasma state react effectively with carbon dioxide to generate carbonates or bicarbonates, thereby fixing carbon dioxide in the waste gas. Furthermore, by utilizing both steam plasma and oxygen plasma, it is expected to increase the catalytic reaction rate and reduce harmful substances in the emitted gas. In particular, by using alkali metal hydroxides such as NaOH and KOH as catalysts, environmentally friendly byproducts can be generated, offering the advantage of applicability to large-scale waste gas treatment, such as that from marine engines. Attached Figure Description

[0028] Figure 1 This is a photo of a plasma power monitor.

[0029] Figure 2 These are exhaust gas measurement data before and after boiler operation, and after plasma catalyst injection.

[0030] Figure 3 This is a schematic diagram illustrating the principle of a plasma catalyst used for decarbonization.

[0031] Figure 4 This is a diagram of a carbon dioxide fixation system according to an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram illustrating a plasma catalyst generating apparatus for capturing carbon dioxide in exhaust gas and a carbon dioxide fixing apparatus for the exhaust gas containing the plasma catalyst generating apparatus according to an embodiment of the present invention.

[0033] Figure 6 This is a cross-sectional view of a plasma catalyst generator for capturing carbon dioxide in exhaust gas according to an embodiment of the present invention.

[0034] Figure 7 This is a cross-sectional view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention.

[0035] Figure 8 This is a cross-sectional view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention.

[0036] Figure 9 This is a perspective view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention.

[0037] Figure 10 This is a perspective view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention. Detailed Implementation

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can be modified in various ways and has various forms, specific embodiments will be shown in the drawings and described in detail herein. However, this is not intended to limit the invention to the specific forms disclosed, and it should be understood that the invention includes all modifications, equivalents, and substitutions falling within the spirit and scope of the invention. Similar reference numerals are used for similar constituent elements in the description of the drawings. In the drawings, for clarity of the invention, the actual dimensions of the structures are shown as enlarged versions.

[0039] The terminology used in this application is for describing specific embodiments only and is not intended to limit the invention.

[0040] Furthermore, the description of one aspect of the invention may be applied in the same or similar manner to the description of other aspects.

[0041] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary knowledge in the art to which this invention pertains. Terms identical to those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be construed as having an ideal or overly formal meaning unless expressly defined in this application.

[0042] The following describes embodiments of the present invention. However, the embodiments described below are only a part of the implementation of the present invention, and the scope of the present invention is not limited to the embodiments described below.

[0043] Example 1 The minimum flow rate of the marine engine is set to 100,000 Nm. 3 / hr, a simulation test was performed.

[0044] Prepare exhaust gas containing carbon dioxide CO2 removal tests were conducted using a boiler equipped with an LPG burner and a plasma catalyst injection device to measure CO2 concentration in the exhaust gas and to determine CO2 concentration.

[0045] The LPG burner consumes 295,000 kcal / hr. Assuming LPG has a calorific value of 12,000 kcal / kg, this translates to approximately 24.6 kg / hr of gas consumption. Dividing this by the boiler's efficiency of 87%, the total fuel consumption is approximately 28 kg / hr.

[0046] To calculate the amount of air required for the complete combustion of LPG fuel, C3H8 + 5O2 → 3CO2 + 4H2O In the above formula, the mass of propane (C3H8) is 44g, and 160g of oxygen is required for complete combustion. Therefore, 102kg of oxygen is needed for the complete combustion of 28kg of LPG. 102kg of oxygen is 3,182mol, and 1mol is 22.4L. Therefore, the required oxygen flow rate is 71,273L.

[0047] Assuming the oxygen content in the air is 20%, the required combustion air volume is 356.4 Nm³. 3 The theoretical air volume is 1.3 times the normal volume per hr, but for safety reasons, an excess of 1.3 times the normal volume is typically used, resulting in a total air volume of approximately 463 Nm³. 3 .

[0048] Preparation of plasma catalyst The electromagnetic plasma has a frequency of 915MHz, and when a power of 10kW is applied, the plasma diameter is approximately 100mm and the length is approximately 600mm.

[0049] The plasma was discharged at a plasma power of 10 kW and an O2 of 150 LPM, resulting in an additional charge of approximately 25 kg / hr (33 Nm). 3 Steam ( / hr). Figure 1 This is a photo of a plasma power monitor.

[0050] NaOH, used as a catalyst, is sprayed as a 60% aqueous solution through a nozzle with a capacity of 60 L / hr. The reaction formula between CO2 and NaOH is as follows.

[0051] CO2 + NaOH → NaHCO3 CO2 + NaOH → Na2CO3 According to the above reaction formula, CO2 in the exhaust gas reacts with NaOH ionized by plasma and is discharged as a byproduct.

[0052] Confirmation result The exhaust gas before boiler operation, after operation, and after plasma catalyst injection was analyzed using a measuring instrument, and the corresponding results are as follows.

[0053] Figure 2 These are exhaust gas measurement data before, after, and after plasma catalyst injection of the boiler. The oxygen concentration before boiler operation was 20.85%, confirmed to be within the normal range. The CO2 concentration in the exhaust gas after boiler operation was approximately 6.72%. The exhaust gas concentration was 463 Nm³. 3 CO2 in / hr is 31 Nm 3 / hr. The weight of 1 mole of CO2 is 44g, and the weight of CO2 in the exhaust gas is approximately 60.1kg / hr.

[0054] A 60% NaOH aqueous solution was directly injected into the plasma through a nozzle with a flow rate of 60 L / hr, at which point the weight of NaOH was 36 kg / hr.

[0055] It can be confirmed that after the plasma catalyst injection, the CO2 concentration in the exhaust gas was 4.17%, a reduction of approximately 40%. In addition, the CO concentration in the exhaust gas was also reduced by 45%.

[0056] The increased concentrations of oxygen and NO in the exhaust gas are presumably due to the use of oxygen plasma, where unreacted oxygen reacts with nitrogen and oxygen in the exhaust gas to form a composite.

[0057] Example 2 In addition to using KOH aqueous solution as a catalyst in Example 1 above, the same experiment was conducted. The results confirmed that by emitting byproducts such as KHCO3 and K2CO3, the CO2 concentration in the exhaust gas was reduced.

[0058] Example 3 Except that the plasma source gas was H2O in Examples 1 and 2 above, the same experiments were conducted. The results confirmed that the CO2 concentration in the exhaust gas was reduced.

[0059] Figure 3 This is a schematic diagram illustrating the principle of a plasma catalyst used for decarbonization.

[0060] Figure 4 Figure 400 shows a carbon dioxide fixation system according to an embodiment of the present invention. The following can be achieved using the apparatus or method according to an embodiment of the present invention: Figure 4 The system shown.

[0061] Reference Figure 4 To fix carbon dioxide in the exhaust gas emitted from ship engines, a plasma catalyst is released into the carbon dioxide-containing exhaust gas. The plasma catalyst reacts with the carbon dioxide in the exhaust gas, thus fixing the carbon dioxide. The exhaust gas, with its carbon dioxide reduced through this reaction, is then discharged into the atmosphere through a scrubbing tower to remove NOx and SOx. Furthermore, byproducts such as Na₂CO₃, NaHCO₃, K₂CO₃, and KHCO₃ produced in the carbon dioxide fixation reaction, along with the NOx and SOx removed from the scrubbing tower, are stored as wastewater and discharged separately.

[0062] In addition, refer to Figure 4 Plasma catalysts are formed by using steam as a discharge gas to generate plasma, and then injecting NaOH or KOH, which acts as a catalyst, into the plasma through steam.

[0063] Figure 5 This is a schematic diagram illustrating a plasma catalyst generator 500 for capturing carbon dioxide in exhaust gas according to an embodiment of the present invention, and a carbon dioxide fixing device for the exhaust gas containing the plasma catalyst generator 500.

[0064] Reference Figure 5 A plasma catalyst generator 500 for capturing carbon dioxide in exhaust gas includes: an electromagnetic waveguide 510 for transmitting electromagnetic waves; a quartz discharge tube 520 that passes through the electromagnetic waveguide 510 and generates plasma through the electromagnetic waves, and includes an outlet for emitting a plasma torch; a discharge gas injection section 530, in which the quartz discharge tube 520 sandwiches the electromagnetic waveguide 510, including an outlet side 521 where the outlet is located and a discharge gas injection side 522 opposite to the outlet, and injects plasma discharge gas into the quartz discharge tube 520 located on the discharge gas injection side 522; and an alkali metal compound injection section 540, located on the outlet side 521, for injecting alkali metal compounds into the plasma.

[0065] The plasma source gas of the injection discharge gas injection unit 530 is any one or more gases selected from steam (H2O) and oxygen.

[0066] The alkali metal compound injection unit 540 includes a carrier gas injection line 541 and an alkali metal compound injection line 542 branching off from the carrier gas injection line, for injecting alkali metal compounds via a carrier gas. In this case, the carrier gas in the carrier gas injection line 541 is steam, which helps to inject the alkali metal compound, which acts as a catalyst into the plasma, into the plasma. This is advantageous when the catalyst is in a solid state. The alkali metal compound in the alkali metal compound injection line 542 can be NaOH or KOH. Thus, NaOH or KOH, which acts as a catalyst, can be forcefully injected with high-pressure steam, thereby penetrating into the plasma.

[0067] On the discharge port side 521, there is one or more additional gas supply sections 550 that supply gas containing vapor to the plasma through the quartz discharge tube 520. The additional vapor supplied at this time helps to increase the reactivity of the carbon dioxide fixation reaction. In other words, it reacts with water and carbon dioxide in the exhaust gas to generate more OH radicals. More OH radicals make the reaction of CO2 with Na and K easier, thereby helping to fix carbon dioxide.

[0068] Figure 6 This is a cross-sectional view of a plasma catalyst generator for capturing carbon dioxide in exhaust gas according to an embodiment of the present invention. (Refer to...) Figure 6 Catalyst is injected into the plasma, and additional steam is introduced to improve reactivity; this is advantageous when the catalyst is in a solid state. This applies only to the case of a catalyst injection nozzle. Figure 6 In the middle diagram, the catalyst in the liquid phase is dissolved in water, and the aqueous solution itself can also act as vapor, which is advantageous. Figure 6 The scenario shown, which applies to multiple catalysts and steam injection nozzles, is a solution where additional catalysts and steam can be added when the CO2 concentration in the exhaust gas is high or when it is desired to react with more CO2.

[0069] Reference Figure 5 A carbon dioxide fixation device for waste gas includes: a waste gas duct for passing through waste gas containing carbon dioxide; and a plasma catalyst generator 500 for capturing carbon dioxide in the waste gas, the outlet of which is connected to the waste gas duct.

[0070] Figure 7 This is a cross-sectional view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention. Figure 8 This is a cross-sectional view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention. Figure 9This is a perspective view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention. Figure 10 This is a perspective view of a carbon dioxide fixation device for waste gas according to an embodiment of the present invention.

[0071] Depending on the exhaust gas flow rate, one or more plasma catalyst generators can be configured. In the case of multiple plasma catalyst generators, their configuration positions can be relatively (…). Figure 7 (on the left side), sections are set along the exhaust gas movement path of the exhaust gas duct and arranged in diagonal lines in sequence ( Figure 7 In the middle Figure 9 Alternatively, the plasma torch of the plasma catalyst generator may be configured such that the discharge section extends through the waste gas duct in a diagonal line along the waste gas movement path of the waste gas duct. Figure 7 The right side Figure 10 ).

[0072] Reference Figure 8 The carbon dioxide fixation device for the exhaust gas includes two or more plasma catalyst generators, which can be arranged radially so that the plasma torch is directed toward the center of the exhaust gas duct.

[0073] Reference Figure 7 and Figure 9 The carbon dioxide fixation device for the exhaust gas includes two or more plasma catalyst generating devices. The plasma catalyst generating devices can be set along the exhaust gas movement path of the exhaust gas pipeline and arranged in a diagonal line.

[0074] Reference Figure 7 and Figure 10 The carbon dioxide fixation device for the exhaust gas includes two or more plasma catalyst generating devices. The discharge part of the plasma catalyst generating device can be connected to the exhaust gas pipeline so that its plasma torch is discharged diagonally along the exhaust gas movement path of the exhaust gas pipeline.

[0075] The present invention has been described above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the present invention without departing from the spirit and scope of the invention as set forth in the claims.

Claims

1. A method for carbon dioxide fixation in exhaust gas, wherein, include: The first step of injecting alkali metal compounds into plasma to form a plasma catalyst; as well as The second step involves ejecting the plasma catalyst into the exhaust gas containing carbon dioxide to capture the carbon dioxide within the exhaust gas.

2. The method for carbon dioxide fixation in exhaust gas according to claim 1, wherein, The plasma is an electromagnetic plasma torch that discharges plasma by injecting plasma source gas into a discharge tube that passes through an electromagnetic waveguide.

3. The method for carbon dioxide fixation in exhaust gas according to claim 1, characterized in that, The alkali metal compound is supplied in solid or liquid phase as a powder or in an aqueous solution.

4. The method for carbon dioxide fixation in exhaust gas according to claim 1, wherein, The alkali metal compound is an alkali metal hydroxide.

5. The method for carbon dioxide fixation in exhaust gas according to claim 4, wherein, The alkali metal hydroxide is one or more solids or aqueous solutions selected from the group consisting of NaOH and KOH.

6. The method for carbon dioxide fixation in exhaust gas according to claim 5, wherein, The alkali metal compound is injected via a carrier gas.

7. The method for carbon dioxide fixation in exhaust gas according to claim 6, characterized in that, The carrier gas is steam.

8. The method for carbon dioxide fixation in exhaust gas according to claim 1, characterized in that, The plasma is a plasma source gas containing vapor (H2O).

9. The method for carbon dioxide fixation in exhaust gas according to claim 8, characterized in that, The plasma source gas also contains oxygen (O2).

10. The method for carbon dioxide fixation in exhaust gas according to claim 1, characterized in that, In the second step, a compound containing bicarbonate or carbonic acid is formed.

11. The method for carbon dioxide fixation in exhaust gas according to claim 10, wherein, The bicarbonate or carbonate compound may be one or more selected from the group consisting of NaHCO3, Na2CO3, KHCO3 and K2CO3.

12. The method for carbon dioxide fixation in exhaust gas according to claim 1, characterized in that, The method described above removes carbon dioxide contained in the large-volume exhaust gas from marine engines and the like.

13. A plasma catalyst generator for capturing carbon dioxide in exhaust gas, wherein, include: Electromagnetic waveguide, used to transmit electromagnetic waves; A quartz discharge tube, through which the electromagnetic waveguide is connected, forms plasma through the electromagnetic waves, and includes an outlet for emitting a plasma torch. A discharge gas injection section, wherein the quartz discharge tube sandwiches the electromagnetic waveguide in the middle, includes an outlet side where the outlet is located and a discharge gas injection side opposite to the outlet, into which plasma discharge gas is injected; and An alkali metal compound injection section, located on the discharge port side, is used to inject alkali metal compounds into the plasma.

14. The plasma catalyst generator for capturing carbon dioxide in exhaust gas according to claim 13, wherein, The plasma source gas includes one or more gases selected from steam (H2O) and oxygen.

15. The plasma catalyst generator for capturing carbon dioxide in exhaust gas according to claim 13, characterized in that, The alkali metal compound injection unit, for injecting the alkali metal compound by means of a carrier gas, includes a carrier gas injection line and an alkali metal compound injection line branching off from the carrier gas injection line.

16. The plasma catalyst generator for capturing carbon dioxide in exhaust gas according to claim 15, characterized in that, The carrier gas is steam.

17. The plasma catalyst generator for capturing carbon dioxide in exhaust gas according to claim 13, wherein, On the outlet side, there is one or more additional gas supply sections that supply gas containing vapor to the plasma through the quartz discharge tube.

18. A carbon dioxide fixation device for waste gas, wherein, include: Exhaust duct for the passage of exhaust gas containing carbon dioxide; and A plasma catalyst generator is used to capture carbon dioxide in the exhaust gas as described in claim 13. The outlet is connected to the exhaust gas pipeline.

19. The carbon dioxide fixation device for waste gas according to claim 18, characterized in that, Includes two or more plasma catalyst generating devices, The two or more plasma catalyst generating devices are arranged radially so that the plasma torch is directed toward the center of the exhaust gas duct.

20. The carbon dioxide fixation device for waste gas according to claim 18, characterized in that, Includes two or more plasma catalyst generating devices, The plasma catalyst generator is arranged in sections along the exhaust gas movement path of the exhaust gas pipeline, and is arranged in a diagonal pattern.

21. The carbon dioxide fixation device for waste gas according to claim 18, wherein, Includes two or more plasma catalyst generating devices, The discharge section of the plasma catalyst generator extends through the waste gas pipe, so that its plasma torch is discharged diagonally along the waste gas movement path of the waste gas pipe.

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