Method for fixing carbon dioxide in exhaust gas, plasma catalyst generating apparatus for collection of carbon dioxide in exhaust gas, and apparatus comprising same for fixing carbon dioxide in exhaust gas

Abstract

Disclosed in the present invention are a method for fixing carbon dioxide in exhaust gas, a plasma catalyst generating apparatus for collection of carbon dioxide in exhaust gas, and an apparatus comprising same for fixing carbon dioxide in exhaust gas. The method for fixing carbon dioxide in exhaust gas comprises: a first step of spraying an alkali metal compound into plasma to form a plasma catalyst; and a second step of discharging the plasma catalyst into exhaust gas containing carbon dioxide to collect carbon dioxide in the exhaust gas.

Description

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

[0001] The present invention relates to a method for fixing carbon dioxide in exhaust gas, a plasma catalyst generating device for capturing carbon dioxide in exhaust gas, and a carbon dioxide fixation device for exhaust gas including the same; more specifically, it relates to a method and device for fixing carbon dioxide contained in large-capacity exhaust gas, such as that from a marine engine.

[0002] Carbon dioxide in exhaust gases is known as a major greenhouse gas causing environmental problems such as global warming, and technologies are required to effectively reduce it. One existing carbon dioxide reduction technology involves capturing and removing carbon dioxide through catalytic reactions. This method fixes carbon dioxide by passing exhaust gas through a catalytic reactor; while generally suitable for treating small volumes of exhaust gas, it has limitations when dealing with large volumes, such as those from marine engines. Furthermore, existing catalytic systems consume a significant amount of energy to raise the temperature of the reaction chamber, resulting in low energy efficiency and difficulties in large-scale application.

[0003] The present invention aims to provide a technology capable of efficiently fixing carbon dioxide even in large volumes of exhaust gas by overcoming the limitations of existing carbon dioxide fixation methods. To this end, a plasma catalytic injection device for reducing carbon dioxide is developed by combining plasma technology with an alkali metal compound catalyst. The present invention aims to efficiently remove carbon dioxide from large volumes of exhaust gas and minimize energy consumption by reacting the carbon dioxide contained in the exhaust gas with an alkali metal compound activated in a plasma state.

[0004] In one aspect, the present invention provides a method for fixing carbon dioxide in exhaust gas, comprising: a first step of forming a plasma catalyst by spraying an alkali metal compound into a plasma; and a second step of collecting carbon dioxide in the exhaust gas by discharging the plasma catalyst into an exhaust gas containing carbon dioxide.

[0005] In the context of this specification, alkali metal compounds refer to compounds containing alkali metals of Group 1, such as sodium and potassium, as non-limiting examples. The alkali metal compounds serve to capture and fix carbon dioxide in exhaust gas.

[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 a carbonate compound or a bicarbonate compound, thereby helping to reduce carbon dioxide in the exhaust gas.

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

[0008] The alkali metal compound of the present invention is characterized by supplying a solid or liquid alkali metal compound in powder form or as an aqueous solution.

[0009] The alkali metal compound of the present invention is characterized as being an alkali metal hydroxide. In this case, it is highly environmentally friendly as the product becomes water, and the hydroxide has the advantage of being easily soluble in water as hydroxide ions and alkali metal ions, allowing it to be supplied as an aqueous solution to acidic wastewater generated in a scrubber to induce a neutralization reaction.

[0010] The alkali metal hydroxide of the present invention is characterized as being one or more solids or aqueous solutions selected from the group comprising NaOH and KOH.

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

[0012] The plasma of the present invention is characterized as being a plasma of a plasma source gas including steam (H2O). In the case of steam plasma, it is characterized by the presence of substances such as OH, H*, and O*, which can act as catalysts, at a density more than 10 times higher than that of conventional gasifiers. In addition, it can prevent ionized alkali metal compounds from recombining and induce conversion to H2O through the generation of additional molecules such as H and O.

[0013] The plasma source gas of the present invention is characterized by further including oxygen (O2). In the case of oxygen plasma, steam can be further added to prevent the recombination of ionized alkali metal compounds and to induce conversion to H2O through the generation of additional molecules such as H and O.

[0014] Depending on the volume of exhaust gas or the concentration of CO2, additional steam can be supplied using exhaust gas containing carbon dioxide. This can help improve the reactivity for carbon dioxide fixation by generating more OH radicals. Furthermore, the additionally supplied steam is advantageous when using a solid-phase catalyst. This is because, since the liquid-phase catalyst is dissolved in water, the aqueous solution itself can also function as steam.

[0015] The present invention is characterized by forming a compound comprising a bicarbonate compound or a carbonate compound in the second step. The compound comprising the bicarbonate compound or the carbonate compound is a byproduct generated as a result of mixing and reacting a plasma catalyst with exhaust gas containing carbon dioxide, thereby fixing carbon dioxide in the exhaust gas and reducing the concentration of carbon dioxide in the exhaust gas. In addition to the compound comprising the bicarbonate compound or the carbonate compound, H2O may be formed.

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

[0017] The above method of the present invention is characterized by fixing carbon dioxide contained in large-volume exhaust gas, such as that from marine engines. Conventional catalytic methods involve passing exhaust gas containing carbon dioxide through a catalytic reactor to fix it on a catalyst; however, this method has the problem of consuming a large amount of electrical energy to raise the temperature of the catalytic reaction section for catalyst activation. While conventional methods are feasible when the amount of exhaust gas is small, they are very difficult to use for large-volume exhaust gas, such as that from marine engines. The present invention, by the method described above, allows for a minimum exhaust gas volume of approximately 100,000 Nm³ 3 It has the advantage of being usable for large-capacity exhaust gases, such as those from marine engines with a flow rate of 1 hr.

[0018] In another aspect, the present invention provides a plasma catalyst generating device for capturing carbon dioxide in exhaust gas, comprising: an electromagnetic wave guide for transmitting electromagnetic waves; a quartz discharge tube penetrating the electromagnetic wave guide and including a discharge port that forms plasma by the electromagnetic waves and discharges a plasma torch; the quartz discharge tube including a discharge port side where the discharge port is located with the electromagnetic wave guide in between and a discharge gas injection side opposite to the discharge port, and a discharge gas injection unit for injecting plasma discharge gas into the quartz discharge tube located on the discharge gas injection side; and an alkali metal compound injection unit located on the discharge port side for spraying an alkali metal compound into the plasma.

[0019] The plasma source gas of the present invention is characterized by comprising one or more gases among steam (H2O) and oxygen.

[0020] The alkali metal compound injection unit of the present invention is characterized by including a carrier gas injection line and an alkali metal compound injection line branched from the carrier gas injection line in order to inject the alkali metal compound through a carrier gas.

[0021] The carrier gas of the present invention is characterized as being steam. When injecting an alkali metal compound, it can be strongly injected with high-pressure steam to penetrate into the plasma.

[0022] The present invention is characterized by including one or more additional gas supply units at the discharge side that supply a gas containing steam to the plasma by penetrating the quartz discharge tube. This generates more OH radicals to help fix carbon dioxide.

[0023] In another aspect, the present invention provides a carbon dioxide fixation device for exhaust gas, comprising: an exhaust gas duct through which exhaust gas containing carbon dioxide passes; and a plasma catalyst generating device for capturing carbon dioxide in the exhaust gas described above, wherein the discharge port penetrates the exhaust gas duct.

[0024] The carbon dioxide fixation device for exhaust gas according to the present invention comprises two or more plasma catalyst generating devices, and the two or more plasma catalyst generating devices are characterized by being radially arranged to discharge a plasma torch toward the center of the exhaust gas duct.

[0025] The carbon dioxide fixation device for exhaust gas according to the present invention comprises two or more plasma catalyst generating devices, and the plasma catalyst generating devices are characterized by being sequentially arranged diagonally along the exhaust gas movement path of the exhaust gas duct.

[0026] The carbon dioxide fixation device for exhaust gas according to the present invention comprises two or more plasma catalyst generating devices, wherein the discharge portion of the plasma catalyst generating device penetrates the exhaust gas duct so that the plasma torch thereof is discharged in a forward diagonal direction along the exhaust gas movement path of the exhaust gas duct.

[0027] According to the present invention, the carbon dioxide fixation method using a plasma catalyst offers significantly improved energy efficiency compared to conventional catalytic reaction methods and is applicable to large-scale exhaust gas treatment. Alkali metal compounds ionized into a plasma state effectively react with carbon dioxide to produce carbonates or bicarbonates, thereby fixing carbon dioxide within the exhaust gas. Furthermore, by utilizing both steam plasma and oxygen plasma, the catalytic reaction rate can be increased, and the effect of reducing harmful substances in the exhaust gas can be expected. In particular, by using alkali metal hydroxides such as NaOH and KOH as catalysts, environmentally friendly byproducts can be generated, and the method has the advantage of being applicable to large-scale exhaust gases, such as those from marine engines.

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

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

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

[0031] FIG. 4 is a diagram of a carbon dioxide fixation system according to one embodiment of the present invention.

[0032] FIG. 5 is a schematic diagram showing a plasma catalyst generating device for capturing carbon dioxide in exhaust gas according to an embodiment of the present invention and a carbon dioxide fixation device for exhaust gas including the same.

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

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

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

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

[0037] FIG. 10 is a perspective view of a carbon dioxide fixation device for exhaust gas according to an embodiment of the present invention.

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. Since the present invention is susceptible to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Similar reference numerals have been used for similar components in the description of each drawing. In the attached drawings, the dimensions of the structures are shown enlarged compared to the actual dimensions for the clarity of the present invention.

[0039] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention.

[0040] In addition, the description of one aspect of the present invention may be applied identically or similarly to the description of other aspects for identical or similar configurations or terms.

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

[0042] The embodiments of the present invention are described below. However, the embodiments described below are merely partial embodiments of the present invention, and the scope of the present invention is not limited to the following embodiments.

[0043] Example 1

[0044] The minimum flow rate of a marine engine is 100,000 Nm 3 A mock test was conducted using / hr.

[0045] Preparation of exhaust gas containing carbon dioxide

[0046] The CO2 concentration in the exhaust gas of a boiler equipped with an LPG gas burner was measured while conducting a CO2 removal test using a plasma catalytic injection device.

[0047] The gas consumption of the LPG burner is 295,000 kcal / hr, and calculating the heat of LPG at 12,000 kcal / kg, it consumes approximately 24.6 kg / hr of gas. Dividing by the boiler's efficiency of 87%, the total amount of fuel used in the boiler is approximately 28 kg / hr.

[0048] If we calculate the amount of air required for the complete combustion of LPG fuel,

[0049] C3H8 + 5O2 → 3CO2 + 4H2O

[0050] In the above equation, the mass of propane (C3H8) is 44g, and since 160g of oxygen is required for complete combustion, 102kg of oxygen is required to completely combust 28kg of LPG. 102kg of oxygen is 3,182mol, and since 1mol is 22.4L, a flow rate of 71,273L of oxygen is required.

[0051] Assuming the oxygen content in the air is 20%, the combustion air volume is calculated to be 356.4 Nm 3 A theoretical air volume of / hr is required, and since 1.3 times the amount of supercharged air is generally supplied for safety, the total airflow is approximately 463 Nm³. 3 am.

[0052] Preparation of plasma catalyst

[0053] The frequency of the electromagnetic plasma was 915 MHz and the power was 10 kW, and the plasma diameter was about 100 mm and the length was about 600 mm.

[0054] Plasma is discharged with a plasma power of 10kW and O2 150LPM, and after discharge, steam is produced at approximately 25kg / hr (33Nm²). 3 Approximately / hr) was added. Figure 1 is a photograph of a plasma power monitor.

[0055] The NaOH used as a catalyst was a 60% aqueous solution sprayed through a nozzle with a capacity of 60 L / hr. The reaction equation between CO2 and NaOH is as follows.

[0056] CO2 + NaOH → NaHCO3

[0057] CO2 + NaOH → Na2CO3

[0058] According to the above reaction equation, CO2 in the exhaust gas reacts with NaOH ionized by plasma and is discharged as a byproduct.

[0059] Check results

[0060] Exhaust gas was analyzed using a measuring instrument before, after, and after the injection of the plasma catalyst in the boiler, and the results are as follows.

[0061] Figure 2 shows exhaust gas measurement data before boiler operation, after operation, and after plasma catalyst injection. The oxygen concentration before boiler operation was 20.85%, confirming it to be within the normal range. After boiler operation, the CO2 concentration in the exhaust gas was approximately 6.72%. Exhaust gas 463 Nm³ 3 CO2 per hr is 31 Nm 3 / hr. The weight per mole of CO2 is 44g, so the weight of CO2 in the exhaust gas is approximately 60.1kg / hr.

[0062] An aqueous NaOH solution with a concentration of 60% was directly injected into the plasma through a nozzle of 60 L / hr, and the weight of the NaOH at this time was 36 kg / hr.

[0063] After plasma catalyst injection, it was confirmed that the CO2 concentration in the exhaust gas decreased by approximately 40% to 4.17%. In addition, the CO concentration in the exhaust gas also decreased by 45%.

[0064] The increase in the concentrations of oxygen and NO in the exhaust gas is presumed to be due to the synthesis of unreacted oxygen reacting with nitrogen and oxygen in the exhaust gas while using oxygen plasma.

[0065] Example 2

[0066] The experiment was conducted in the same manner as in Example 1 described above, except that an aqueous KOH solution was used as the catalyst. As a result, KHCO 3, It was confirmed that byproducts such as K2CO3 were emitted and the CO2 concentration in the exhaust gas decreased.

[0067] Example 3

[0068] The experiment was conducted in the same manner as in the above-described Examples 1 and 2, except that the plasma source gas was H2O. As a result, it was confirmed that the CO2 concentration in the exhaust gas decreased.

[0069] Figure 3 is a schematic diagram illustrating the principle of a plasma catalyst for decarbonization.

[0070] FIG. 4 is a diagram (400) of a carbon dioxide fixation system according to one embodiment of the present invention. A system such as FIG. 4 can be implemented using a device or method according to one embodiment of the present invention.

[0071] Referring to Fig. 4, a plasma catalyst is discharged into the exhaust gas containing carbon dioxide to fix carbon dioxide emitted from a ship engine. At this time, the plasma catalyst reacts with the carbon dioxide in the exhaust gas to fix the carbon dioxide. The exhaust gas, with carbon dioxide reduced through this reaction, is discharged into the atmosphere through a scrubber that removes NOx and SOx. Additionally, the Na2CO generated from the carbon dioxide fixation reaction 3, NaHCO 3,K2CO 3, By-products such as KHCO3, and NOx and SOx removed by the scrubber, are stored as wastewater and then discharged separately.

[0072] Additionally, referring to Fig. 4, a plasma catalyst is formed by generating plasma using steam as a discharge gas and injecting NaOH or KOH, which acts as a catalyst into the plasma, through the steam.

[0073] FIG. 5 is a schematic diagram showing a plasma catalyst generating device (500) for capturing carbon dioxide in exhaust gas according to an embodiment of the present invention and a carbon dioxide fixation device for exhaust gas including the same.

[0074] Referring to FIG. 5, a plasma catalyst generating device (500) for capturing carbon dioxide in exhaust gas comprises: an electromagnetic wave guide (510) for transmitting electromagnetic waves; a quartz discharge tube (520) that penetrates the electromagnetic wave guide (510) and includes a discharge port that forms plasma by the electromagnetic waves and discharges a plasma torch; the quartz discharge tube (520) includes a discharge port side (521) where the discharge port is located with the electromagnetic wave guide (510) in between and a discharge gas injection side (522) opposite to the discharge port, and a discharge gas injection part (530) that injects plasma discharge gas into the quartz discharge tube (520) located on the discharge gas injection side (522); and an alkali metal compound injection part (540) located on the discharge port side (521) that sprays an alkali metal compound with the plasma.

[0075] The plasma source gas injected into the discharge gas injection unit (530) is one or more gases among steam (H2O) and oxygen.

[0076] The alkali metal compound injection unit (540) includes a carrier gas injection line (541) and an alkali metal compound injection line (542) branched from the carrier gas injection line to inject an alkali metal compound through a carrier gas. At this time, the carrier gas injected through the carrier gas injection line (541) is steam, and the steam acting as the carrier gas helps to inject the alkali metal compound, which acts as a catalyst for plasma, into the plasma. It is advantageous if the catalyst is in a solid state. The alkali metal compound injected through the alkali metal compound injection line (542) may be NaOH or KOH. Through this, the NaOH or KOH acting as a catalyst can be strongly injected with high-pressure steam to penetrate into the plasma.

[0077] At the discharge side (521), one or more additional gas supply units (550) are included to supply gas containing steam to the plasma by penetrating the quartz discharge tube (520). The additional steam supplied at this time helps improve 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, and more OH radicals facilitate the reaction between CO2 and Na and K, thereby helping to fix carbon dioxide.

[0078] FIG. 6 is a cross-sectional view of a plasma catalyst generation device for capturing carbon dioxide in exhaust gas according to an embodiment of the present invention. Referring to FIG. 6, a catalyst is injected with plasma, and additional steam is introduced to enhance reactivity; this is advantageous when the catalyst is in a solid state. In the case where only a catalyst injection nozzle is applied (middle figure of FIG. 6), the liquid catalyst is dissolved in water, and the aqueous solution itself can also act as steam, which is advantageous. In the case where multiple catalyst and steam injection nozzles are applied as shown in FIG. 6, additional catalyst and steam can be introduced when the CO2 concentration in the exhaust gas is high or when a reaction with more CO2 is desired.

[0079] Referring to FIG. 5, the exhaust gas carbon dioxide fixation device includes an exhaust gas duct through which exhaust gas containing carbon dioxide passes; and a plasma catalyst generating device (500) for capturing carbon dioxide in the exhaust gas described above, and the discharge port penetrates the exhaust gas duct.

[0080] FIG. 7 is a cross-sectional view of a carbon dioxide fixation device for exhaust gas according to an embodiment of the present invention. FIG. 8 is a cross-sectional view of a carbon dioxide fixation device for exhaust gas according to an embodiment of the present invention. FIG. 9 is a perspective view of a carbon dioxide fixation device for exhaust gas according to an embodiment of the present invention. FIG. 10 is a perspective view of a carbon dioxide fixation device for exhaust gas according to an embodiment of the present invention.

[0081] One or more plasma catalyst generators may be arranged according to the exhaust gas flow rate. When multiple plasma catalyst generators are included, the arrangement positions may be facing each other (left side of FIG. 7), arranged sequentially diagonally in steps along the exhaust gas path of the exhaust gas duct (middle of FIG. 7, FIG. 9), or arranged so that the discharge portion penetrates the exhaust gas duct so that the plasma torch of the plasma catalyst generator is discharged diagonally in the forward direction of the exhaust gas path of the exhaust gas duct (right side of FIG. 7, FIG. 10).

[0082] Referring to FIG. 8, the carbon dioxide fixation device for exhaust gas includes two or more plasma catalyst generating devices, and the two or more plasma catalyst generating devices may be radially formed to discharge a plasma torch toward the center of the exhaust gas duct.

[0083] Referring to FIGS. 7 and 9, the carbon dioxide fixation device for exhaust gas includes two or more plasma catalyst generating devices, and the plasma catalyst generating devices can be arranged diagonally in stages along the exhaust gas movement path of the exhaust gas duct.

[0084] Referring to FIGS. 7 and FIGS. 10, the carbon dioxide fixation device for exhaust gas includes two or more plasma catalyst generating devices, and the discharge portion of the plasma catalyst generating device can penetrate the exhaust gas duct so that its plasma torch is discharged in a forward diagonal direction along the exhaust gas travel path of the exhaust gas duct.

[0085] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as set forth in the following claims.

Claims

1. A first step of forming a plasma catalyst by spraying an alkali metal compound into the plasma; and A second step comprising discharging the plasma catalyst into an exhaust gas containing carbon dioxide to capture carbon dioxide in the exhaust gas, Method for fixing carbon dioxide in exhaust gas.

2. In Paragraph 1, The above plasma is an electromagnetic plasma torch that discharges plasma by injecting a plasma source gas into a discharge tube penetrating an electromagnetic waveguide, Method for fixing carbon dioxide in exhaust gas.

3. In Paragraph 1, The above alkali metal compound is characterized by being supplied in the form of a solid or liquid alkali metal compound powder or an aqueous solution. Method for fixing carbon dioxide in exhaust gas.

4. In Paragraph 1, The above alkali metal compound is an alkali metal hydroxide, Method for fixing carbon dioxide in exhaust gas.

5. In Paragraph 4, The above alkali metal hydroxide is one or more solids or aqueous solutions selected from the group including NaOH and KOH, Method for fixing carbon dioxide in exhaust gas.

6. In Paragraph 5, The injection of the above alkali metal compound is configured to be injected through a carrier gas, Method for fixing carbon dioxide in exhaust gas.

7. In Paragraph 6, The above carrier gas is characterized as being steam, Method for fixing carbon dioxide in exhaust gas.

8. In Paragraph 1, The above plasma is characterized as being a plasma of a plasma source gas including steam (H2O), Method for fixing carbon dioxide in exhaust gas.

9. In Paragraph 8, The above plasma source gas is characterized by further including oxygen (O2), Method for fixing carbon dioxide in exhaust gas.

10. In Paragraph 1, Characterized by forming a compound containing a bicarbonate compound or a carbonate compound in the second step above. Method for fixing carbon dioxide in exhaust gas.

11. In Paragraph 10, The above bicarbonate compound or carbonate compound may be one or more selected from the group including NaHCO3, Na2CO3, KHCO3, and K2CO3. Method for fixing carbon dioxide in exhaust gas.

12. In Paragraph 1, The above method is characterized by fixing carbon dioxide contained in large-capacity exhaust gas, such as from a marine engine. Method for fixing carbon dioxide in exhaust gas.

13. Electromagnetic wave guide for transmitting electromagnetic waves; A quartz discharge tube including a discharge port that penetrates the electromagnetic wave guide, forms plasma by the electromagnetic wave, and discharges a plasma torch; The above quartz discharge tube includes a discharge port side where the discharge port is located with the electromagnetic waveguide in between, and a discharge gas injection side opposite to the discharge port, and a discharge gas injection unit for injecting plasma discharge gas into the quartz discharge tube located on the discharge gas injection side; and Alkali metal compound injection unit located on the discharge port side, which sprays an alkali metal compound with the plasma, Plasma catalyst generator for capturing carbon dioxide in exhaust gas.

14. In Paragraph 13, The above plasma source gas comprises one or more gases selected from steam (H2O) and oxygen. Plasma catalyst generator for capturing carbon dioxide in exhaust gas.

15. In Paragraph 13, The above alkali metal compound injection part In order to inject the alkali metal compound through a carrier gas, Characterized by including the above-mentioned carrier gas injection line and the above-mentioned alkali metal compound injection line branched from the above-mentioned carrier gas injection line, Plasma catalyst generator for capturing carbon dioxide in exhaust gas.

16. In Paragraph 15, The above carrier gas is characterized as being steam, Plasma catalyst generator for capturing carbon dioxide in exhaust gas.

17. In Paragraph 13, A gas supply unit comprising one or more additional gas supply units that supply a gas containing steam to the plasma by penetrating the quartz discharge tube at the discharge port side, Plasma catalyst generator for capturing carbon dioxide in exhaust gas.

18. An exhaust gas duct through which exhaust gas containing carbon dioxide passes; and It includes a plasma catalyst generator for capturing carbon dioxide in exhaust gas according to claim 13, and The above discharge port penetrates the above exhaust gas duct, Exhaust gas carbon dioxide fixation device.

19. In Paragraph 18, It includes two or more plasma catalyst generating devices, and The above two or more plasma catalyst generating devices are characterized by being radially arranged to discharge a plasma torch toward the center of the exhaust gas duct. Exhaust gas carbon dioxide fixation device.

20. In Paragraph 18, It includes two or more plasma catalyst generating devices, and The above plasma catalyst generating device is characterized by being sequentially arranged diagonally in stages along the exhaust gas movement path of the exhaust gas duct. Exhaust gas carbon dioxide fixation device.

21. In Paragraph 18, It includes two or more plasma catalyst generating devices, and The above plasma catalyst generating device has a discharge portion that penetrates the exhaust gas duct so that its plasma torch is discharged in a forward diagonal direction along the exhaust gas movement path of the exhaust gas duct. Exhaust gas carbon dioxide fixation device.

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