A radioactive exhaust gas treatment system and a treatment method

Abstract

This invention relates to a radioactive waste gas treatment system and method. The waste gas treatment system includes a retention device, a humidification device, an electrolysis device, and a carbon dioxide removal device. The retention device has an inlet for introducing the waste gas to be treated, and its outlet is connected to the inlet of the humidification device for removing inert gases from the waste gas. The outlet of the humidification device is connected to the gas phase inlet of the electrolysis device, and the humidified gas enters between the anode plate and the anode electrode. The gas phase outlet of the electrolysis device is connected to the inlet of the carbon dioxide removal device for completely oxidizing hydrogen and methane in the waste gas. The carbon dioxide removal device removes carbon dioxide from the gas output from the electrolysis device. This invention is based on the oxidation and removal of methane and hydrogen from the waste gas using an electrolysis device, thereby avoiding the safety hazards associated with high-temperature reactions or the introduction of oxygen. Furthermore, the electrolytic oxidation method for removing methane and hydrogen has the advantage of a high reaction rate.

Description

Technical Field

[0001] This invention relates to the field of nuclear industry waste gas treatment technology, and in particular to a radioactive waste gas treatment system and treatment method. Background Technology

[0002] Atoms of elements such as carbon, nitrogen, and oxygen present in the moderator / coolant, nuclear fuel, and primary loop materials of a nuclear power plant reactor will produce radioactive carbon-14 under high-energy neutron bombardment. In pressurized water reactors, gaseous carbon-14 mainly originates from hydrogen-containing exhaust gases in the primary loop during unit overhauls, and primarily includes... 14 CO2 (5-25%) and 14 CH4 (75-95%). 14 CO2 is highly reactive and can be eliminated by absorption by alkaline substances; however... 14 CH4 molecules possess high symmetry and weak polarity, making efficient removal through adsorption difficult. The International Atomic Energy Agency (IAEA) recommends removing CH4 molecules from waste gases. 14 CH4 first transforms into the more chemically reactive form. 14 CO2 is then processed further.

[0003] The existing ones 14 CH4 is converted to 14 The main methods for controlling CO2 oxidation include direct combustion, plasma oxidation, thermocatalytic oxidation, and photocatalytic oxidation. Combustion is suitable for high concentrations of CO2. 14 CH4, while the hydrogen-containing exhaust gas from pressurized water reactors 14 Since the CH4 concentration is less than 1%, direct combustion is not suitable for this scenario. Plasma oxidation can be used for low concentrations. 14 The oxidation of CH4 requires the introduction of oxygen into the reaction system; data indicate that hydrogen accounts for approximately 30%-80% of the hydrogen-containing exhaust gas from pressurized water reactors (covering the explosive limits of hydrogen), with the remaining components being... 14 CO2 (5-25%) and 14 CH4 (75-95%), therefore the introduction of oxygen could lead to a hydrogen explosion. Furthermore, plasma can convert oxygen into harmful ozone; thermocatalytic oxidation requires high temperatures (>300°C) and the presence of oxygen to achieve high conversion rates, however, the high temperatures could ignite a fire, and similarly, the introduction of oxygen increases the risk of a hydrogen explosion. Photocatalysis can be used for low concentrations of... 14 While CH4 oxidation can be achieved, the low reaction rate results in a slow processing speed, which cannot meet the needs of practical engineering applications. Therefore, how to safely and efficiently remove low concentrations of methane from waste gas has become an urgent problem to be solved. Summary of the Invention

[0004] This invention discloses a radioactive waste gas treatment system and method, aiming to solve the technical problems existing in the prior art.

[0005] The present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a radioactive waste gas treatment system, characterized in that it includes a retention device, a humidification device, an electrolysis device, and a carbon dioxide removal device; the retention device has an inlet for introducing the waste gas to be treated, the outlet of the retention device is connected to the inlet of the humidification device, and is used to remove inert gases from the waste gas; the outlet of the humidification device is connected to the gas phase inlet of the electrolysis device, and the humidified gas enters between the anode plate and the anode electrode; the gas phase outlet of the electrolysis device is connected to the inlet of the carbon dioxide removal device, and is used to completely oxidize hydrogen and methane in the waste gas; the carbon dioxide removal device is used to remove carbon dioxide from the gas output by the electrolysis device.

[0007] In a radioactive waste gas treatment system of the present invention, the retention device is a long tubular structure with an inlet and an outlet at both ends, and is filled with an adsorbent material; the adsorbent material is used to adsorb inert gases in the waste gas.

[0008] In a radioactive waste gas treatment system of the present invention, the retention device includes an arc-shaped tube.

[0009] In a radioactive waste gas treatment system of the present invention, the humidification device includes an inlet main pipe, a first branch pipe, a second branch pipe, and a water tank; the inlet main pipe is connected to the outlet of the retention device; one end of the first branch pipe and the second branch pipe are respectively connected to the inlet main pipe, and the other end of the first branch pipe is connected to the gas phase inlet of the electrolysis device; the other end of the second branch pipe is connected to the inlet of the water tank; the inlet of the water tank is located below the water surface, and the gas phase outlet of the water tank is connected to the first branch pipe.

[0010] In a radioactive waste gas treatment system of the present invention, the humidification device further includes a first flow meter, a second flow meter, and a control valve; the first flow meter is installed on the main inlet pipe and is used to measure the gas flow rate in the main inlet pipe; the second flow meter is installed on the first branch pipe or the second branch pipe and is used to measure the gas flow rate in the first branch pipe or the second branch pipe; the control valve is installed on the first branch pipe or the second branch pipe and is used to adjust the gas flow rate in the first branch pipe or the second branch pipe.

[0011] In a radioactive waste gas treatment system of the present invention, the electrolysis device includes an anode plate, an anode electrode, an ion exchange membrane, a cathode electrode, and a cathode plate; the anode plate and the anode electrode are spaced apart to form a space for gas to pass through; the ion exchange membrane is disposed between the anode electrode and the cathode electrode; the cathode electrode and the ion exchange membrane are spaced apart to form a space for electrolyte to pass through; the cathode plate is attached to the surface of the cathode electrode opposite to the ion exchange membrane.

[0012] In a radioactive waste gas treatment system of the present invention, a plurality of electrolysis devices are included; the plurality of electrolysis devices are stacked among each other.

[0013] In a radioactive waste gas treatment system of the present invention, a monitoring device and a conveying device are also included; the monitoring device is used to monitor the gas composition at the gas outlet of the electrolysis device; the inlet of the conveying device is connected to the gas outlet of the electrolysis device, and the outlet is connected to the inlet of the humidification device.

[0014] In a second aspect, the present invention also provides a method for treating waste gas using any of the above-described treatment systems, the method comprising:

[0015] The waste gas is introduced into the treatment system and then into a retention device to remove the inert gas from the waste gas.

[0016] Then, a humidification device is introduced to humidify the exhaust gas;

[0017] Then, an electrolysis device is introduced to oxidize the methane and hydrogen in the waste gas into carbon dioxide and water;

[0018] Then, after passing through the carbon dioxide removal equipment, it is discharged externally.

[0019] In the processing method of the present invention, the relative humidity of the exhaust gas after being humidified by the humidification device is 60-80%.

[0020] In the processing method of the present invention, the electrolyte in the electrolysis device is a potassium salt or sodium salt solution.

[0021] The processing method of the present invention further includes a gas detection step;

[0022] The exhaust gas from the outlet of the electrolysis unit is monitored by monitoring equipment.

[0023] If the monitoring results are satisfactory, the waste gas will be sent to the subsequent carbon dioxide removal equipment for treatment.

[0024] If the monitoring result is unqualified, the conveying equipment will circulate the exhaust gas to the air inlet of the humidification device for rehumidification.

[0025] The technical solution adopted in this invention can achieve the following beneficial effects:

[0026] This invention mainly provides a radioactive waste gas treatment system. Based on the use of an electrolysis device to oxidize and remove methane and hydrogen from the waste gas, it avoids the safety hazards associated with high-temperature reactions or the introduction of oxygen. Moreover, the removal of methane and hydrogen by electrolytic oxidation has a high reaction rate. Furthermore, by using a humidification device to humidify the waste gas entering the electrolysis device, the methane and hydrogen in the waste gas can exist in the gas phase within the electrolysis device and undergo oxidation, thereby improving the reaction efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a radioactive waste gas treatment system according to the present invention;

[0029] Figure 2 This is one of the structural schematic diagrams of the humidification device of the present invention;

[0030] Figure 3 This is a schematic diagram of the retention device of the present invention;

[0031] Figure 4 This is a schematic diagram of the electrolysis apparatus of the present invention;

[0032] Figure 5 This is a second schematic diagram of the humidification device of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Retention device; 2. Humidification device; 21. Main air inlet pipe; 22. First branch pipe; 23. Second branch pipe; 24. Water tank; 25. Ejector; 26. First flow meter; 27. Second flow meter; 28. Control valve; 3. Electrolysis device; 31. Anode plate; 32. Anode electrode; 33. Ion exchange membrane; 34. Cathode electrode; 35. Cathode plate; 4. Carbon dioxide removal equipment; 5. Monitoring equipment; 6. Conveying equipment. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0037] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] To address the problems existing in the prior art, this application provides a radioactive waste gas treatment system and treatment method.

[0039] Example 1

[0040] This embodiment provides a radioactive waste gas treatment system, such as Figure 1 As shown, it includes a retention device 1, a humidification device 2, an electrolysis device 3, and a carbon dioxide removal device 4. The retention device 1 has an inlet for introducing external waste gas to be treated. The outlet of the retention device 1 is connected to the inlet of the humidification device 2 for removing inert gases, such as trace amounts of krypton and xenon, from the waste gas. The outlet of the humidification device 2 is connected to the gas phase inlet of the electrolysis device 3, and the humidified gas enters between the anode plate 31 and the anode electrode 32. The gas phase outlet of the electrolysis device 3 is connected to the inlet of the carbon dioxide removal device 4 and is used to completely oxidize hydrogen and methane in the waste gas. The carbon dioxide removal device 4 is used to remove carbon dioxide from the gas output from the electrolysis device 3.

[0041] The radioactive waste gas treatment system of the present invention eliminates methane and hydrogen in the waste gas by oxidizing and removing them using an electrolysis device 3. This avoids the safety hazards associated with high-temperature reactions or the introduction of oxygen. Furthermore, the elimination of methane and hydrogen through electrolytic oxidation achieves an elimination rate greater than 1 m³ / s. 3 / h; Based on the humidification of the exhaust gas entering the electrolysis unit 3 by the humidification device 2, the methane and hydrogen in the exhaust gas can exist in the gas phase within the electrolysis unit 3 and undergo oxidation reactions, thereby improving diffusion efficiency and catalytic efficiency, and thus enhancing... 14The process significantly improves the safety and reliability of hydrogen-containing waste gas treatment by eliminating CH4 efficiently and eliminating any risk of hydrogen explosion.

[0042] In some preferred embodiments, such as Figure 1 and 3 As shown, the retention device 1 is a long tubular structure with good pressure resistance, with an air inlet and an air outlet at both ends, and is filled with adsorption materials such as activated carbon or molecular sieves; the adsorption material is used to adsorb inert gases in the waste gas.

[0043] In some preferred embodiments, the retention device 1 includes an arc-shaped tube; by adopting an arc-shaped tube, space can be saved; and channeling phenomena can be reduced.

[0044] Preferably, the retention device 1 is a spiral tubular structure; based on this, the space utilization can be maximized and the channeling phenomenon can be reduced to the greatest extent.

[0045] In some preferred embodiments, the humidifying device 2 is a water tank or a spray humidifying device. Preferably, the humidifying device 2 is a humidifying device with temperature control function to adjust the relative humidity of the gas at the outlet; specifically, such as... Figure 5 As shown, the humidification device 2 includes a water tank 201, a heating element 202, a humidity measuring element 203, and a control element 204. The heating element 202 is used to heat the liquid in the water tank 201, such as a heating tape. The air inlet of the water tank 201 is connected to the outlet of the retention device 1. The humidity measuring element 203 is used to measure the humidity of the gas at the air outlet of the water tank 201. The control element 204 is connected to the humidity measuring element 203 and the heating element 202 to control the heating power of the heating element 202 based on the humidity value measured by the humidity measuring element 203. For example, when the humidity value is lower than the required value, the heating power of the heating element 202 is increased, thereby achieving humidity control. The control element 204 can be a PLC controller or a DCS control system.

[0046] In some preferred embodiments, such as Figure 2 As shown, the humidification device 2 includes an air inlet main pipe 21, a first branch pipe 22, a second branch pipe 23, and a water tank 24; the air inlet main pipe 21 is connected to the air outlet of the retention device 1; one end of the first branch pipe 22 and the second branch pipe 23 are respectively connected to the air inlet main pipe 21, and the other end of the first branch pipe 22 is connected to the gas phase inlet of the electrolysis device 3; the other end of the second branch pipe 23 is connected to the air inlet of the water tank 24; the air inlet of the water tank 24 is located below the water surface, and the gas phase outlet of the water tank 24 is connected to the first branch pipe 22; based on humidifying a portion of the exhaust gas, compared with the method of humidifying all the exhaust gas into the water tank 24, the pressure drop is lower, thereby reducing energy loss; preferably, the relative humidity of the gas at the outlet of the water tank 24 is 80%.

[0047] Preferably, the humidification device 2 further includes an ejector 25, the inlet of which is connected to the other end of the first branch pipe 22, the outlet of which is connected to the gas phase inlet of the electrolysis device 3, and the ejector fluid inlet of the ejector 25 is connected to the gas phase outlet of the water tank 24; by adding the ejector 25, the two gases can be mixed by the ejector 25, which can improve the uniformity of humidification.

[0048] In some preferred embodiments, the humidification device 2 further includes a first flow meter 26, a second flow meter 27, and a control valve 28; the first flow meter 26 is installed on the main air inlet pipe 21 to measure the gas flow rate in the main air inlet pipe 21; the second flow meter 27 is installed on the first branch pipe 22 or the second branch pipe 23 to measure the gas flow rate in the first branch pipe 22 or the second branch pipe 23; the control valve 28 is installed on the first branch pipe 22 or the second branch pipe 23 to adjust the gas flow rate in the first branch pipe 22 or the second branch pipe 23; based on the measurement of the gas flow rate in the first branch pipe 22 and the second branch pipe 23 by the first flow meter 26 and the second flow meter 27, the relative humidity of the gas at the outlet of the final ejector 25 can be calculated, and the flow rate can be adjusted by the control valve 28, thereby controlling the relative humidity of the exhaust gas entering the electrolysis device 3 to maintain the electrolysis efficiency of the electrolysis device 3.

[0049] In some preferred embodiments, such as Figure 4 As shown, the electrolysis device 3 includes an anode plate 31, an anode electrode 32, an ion exchange membrane 33, a cathode electrode 34, and a cathode plate 35. The anode plate 31 and the anode electrode 32 are spaced apart, forming a space for gas to pass through. The ion exchange membrane 33 is disposed between the anode electrode 32 and the cathode electrode 34 to isolate them and prevent short circuits, such as on the surface of the anode electrode 32 away from the anode plate 31. The cathode electrode 34 and the ion exchange membrane 33 are spaced apart, forming a space for electrolyte to pass through. The cathode plate 35 is attached to the surface of the cathode electrode 34 away from the ion exchange membrane 33. There is no electrolyte between the anode plate 31 and the anode electrode 32; instead, water vapor in the waste gas condenses on the surface of the anode electrode 32 to form a water film, thereby realizing the oxidation reaction of methane and hydrogen. Specifically, the space for electrolyte to pass through formed between the cathode electrode 34 and the ion exchange membrane 33 has an inlet and an outlet for electrolyte transportation.

[0050] The reactions at the anode and cathode in electrolysis unit 3 are as follows:

[0051] Cathode reaction: 10H₂O + 10e - →10OH - +5H2;

[0052] Anode reaction formula 1: 14 CH4+8OH - -8e - → 14CO2 + 6H2O;

[0053] Anode reaction formula 2: H2 + 2OH - -2e - →2H2O;

[0054] Overall reaction: 4H2O+ 14 CH4→4H2+ 14 CO2.

[0055] Preferably, the gas flow rate of the electrolysis device 3 is 0-100 m³ / h. 3 / h; Working voltage is greater than 0 and less than or equal to 100V; Working current is greater than 0 and less than or equal to 100A; During operation, it can be based on 14 The conversion rate of CH4 is used to adjust the input voltage, current, and gas flow rate of the electrolysis unit. When the conversion rate is below 99.9%, the anode voltage and current are increased, or the inlet flow rate of the electrolysis unit is reduced.

[0056] In some preferred embodiments, a plurality of electrolysis devices 3 are included; the plurality of electrolysis devices 3 are stacked among each other; the amount of waste gas treated can be increased by setting multiple stacked electrolysis devices 3; for example, the stacking arrangement is greater than 0 and less than or equal to 100 layers.

[0057] In some preferred embodiments, such as Figure 1 As shown, it also includes monitoring equipment 5 and conveying equipment 6; monitoring equipment 5 is used to monitor the gas composition at the gas outlet of electrolysis unit 3, and monitor... 14 The concentration and content of CH4; the inlet of the conveying equipment 6 is connected to the gas outlet of the electrolysis device 3, and the outlet is connected to the inlet of the humidification device 2.

[0058] Specifically, monitoring device 5 is a gas chromatograph, a high-precision gas detector, or a gas chromatography-mass spectrometry (GC-MS) instrument.

[0059] Specifically, valves are installed on the inlet pipe of the carbon dioxide removal equipment 4 and the inlet pipe of the conveying equipment 6 to control their opening and closing. Preferably, the valves are program-controlled valves.

[0060] Specifically, the conveying device 6 is an air pump.

[0061] In some preferred embodiments, the carbon dioxide removal device 4 is an absorption removal or adsorption removal device; when adsorption removal is selected, a dehydration device should also be provided to remove moisture between carbon dioxide removal processes to avoid affecting the adsorption performance of the carbon dioxide adsorbent.

[0062] Example 2

[0063] This embodiment provides a waste gas treatment method using the treatment system described in Embodiment 1 above, the method comprising:

[0064] The waste gas is introduced into the treatment system and then into the retention device 1 to remove the inert gas from the waste gas.

[0065] Then, humidification device 2 is introduced to humidify the exhaust gas;

[0066] Then, the gas is passed into the electrolysis device 3 to oxidize the methane and hydrogen in the waste gas into carbon dioxide and water; optionally, the electrolyte in the electrolysis device 3 is an inorganic salt solution, such as an aqueous solution of lithium, sodium, potassium, cesium sulfate, chloride, phosphate and nitrate.

[0067] Then, after passing through carbon dioxide removal equipment 4, it is discharged externally.

[0068] The treatment method of the present invention is based on the oxidation and removal of methane and hydrogen in the waste gas by the electrolysis device 3, which avoids the safety hazards that exist when high temperature reaction or oxygen is introduced, and the removal of methane and hydrogen by electrolytic oxidation has a high reaction rate; based on the humidification of the waste gas entering the electrolysis device 3 by the humidification device 2, the waste gas can exist in the gas phase in the electrolysis device 3 and undergo oxidation reaction, which improves the reaction efficiency.

[0069] In some preferred embodiments, the relative humidity of the exhaust gas after humidification by the humidification device 2 is 60-80%. Too low a relative humidity will result in insufficient wetting of the catalyst on the surface of the anode electrode 32, leading to a decrease in the electrolysis rate. Too high a relative humidity will result in excessive water on the catalyst surface, which is not conducive to the diffusion of CH4 and H2 gases, and thus also not conducive to the electrolysis. Optionally, the anode electrode 32 is a catalyst coating of a material with electrocatalytic oxidation of methane and hydrogen, including but not limited to nickel-based, iron-based, cobalt-based, and noble metals (platinum, gold, palladium, etc.). The cathode electrode 34 is a catalyst coating of a material with electrocatalytic hydrogen evolution activity, including but not limited to nickel-based, iron-based, cobalt-based, molybdenum-based, noble metals (platinum, palladium, ruthenium, etc.), and carbon materials.

[0070] In some preferred embodiments, the electrolyte in the electrolysis device 3 is a potassium salt or sodium salt solution; selecting an aqueous solution of potassium salt or sodium salt as the electrolyte can achieve high oxidation efficiency and economy.

[0071] In some preferred embodiments, a gas detection step is also included;

[0072] The exhaust gas from the outlet of electrolysis unit 3 is monitored by monitoring equipment 5.

[0073] If the monitoring results are satisfactory (e.g., methane activity in the gas < 1 Bq / g), then the waste gas will be sent to the subsequent carbon dioxide removal equipment 4 for treatment.

[0074] If the monitoring result is unqualified, the conveying equipment 6 will circulate the exhaust gas to the air inlet of the humidification device 2 for humidification again.

[0075] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A radioactive waste gas treatment system, characterized in that, This includes retention devices, humidification devices, electrolysis devices, and carbon dioxide removal equipment; The retention device has an air inlet for introducing the waste gas to be treated, and the air outlet of the retention device is connected to the air inlet of the humidification device and is used to remove inert gases from the waste gas. The outlet of the humidification device is connected to the gas phase inlet of the electrolysis device, and the humidified gas enters between the anode plate and the anode electrode. The gas phase outlet of the electrolysis device is connected to the inlet of the carbon dioxide removal device and is used to completely oxidize the hydrogen and methane in the waste gas. The carbon dioxide removal equipment is used to remove carbon dioxide from the gas output from the electrolysis device.

2. The radioactive waste gas treatment system according to claim 1, characterized in that, The retention device is a long tubular structure with an air inlet and an air outlet at each end, and is filled with adsorbent material. The adsorbent material is used to adsorb inert gases in the waste gas.

3. The radioactive waste gas treatment system according to claim 2, characterized in that, The retention device includes an arc-shaped tube.

4. The radioactive waste gas treatment system according to claim 1, characterized in that, The humidification device includes an air inlet main pipe, a first branch pipe, a second branch pipe, and a water tank; The main air intake pipe is connected to the air outlet of the retention device; One end of the first branch pipe and one end of the second branch pipe are respectively connected to the main air inlet pipe, and the other end of the first branch pipe is connected to the gas phase inlet of the electrolysis device; The other end of the second branch pipe is connected to the air inlet of the water tank; The air inlet of the water tank is located below the water surface, and the gas phase outlet of the water tank is connected to the first branch pipe.

5. A radioactive waste gas treatment system according to claim 4, characterized in that, The humidification device also includes a first flow meter, a second flow meter, and a control valve; The first flow meter is installed in the main intake pipe and is used to measure the gas flow rate in the main intake pipe; The second flow meter is installed in the first branch pipe or the second branch pipe to measure the gas flow rate in the first branch pipe or the second branch pipe; The control valve is installed on the first branch pipe or the second branch pipe and is used to adjust the gas flow rate in the first branch pipe or the second branch pipe.

6. The radioactive waste gas treatment system according to claim 1, characterized in that, The electrolysis device includes an anode plate, an anode electrode, an ion exchange membrane, a cathode electrode, and a cathode plate; The anode plate and the anode electrode are spaced apart, forming a space between them for gas to pass through; The ion exchange membrane is disposed between the anode electrode and the cathode electrode; The cathode electrode and the ion exchange membrane are spaced apart, forming a space through which the electrolyte can pass; The cathode plate is attached to the surface of the cathode electrode that is away from the ion exchange membrane.

7. The radioactive waste gas treatment system according to claim 1, characterized in that, It includes multiple electrolysis devices; the multiple electrolysis devices are stacked together.

8. The radioactive waste gas treatment system according to claim 1, characterized in that, It also includes monitoring equipment and conveying equipment; The monitoring equipment is used to monitor the gas composition at the gas outlet of the electrolysis unit. The inlet of the conveying equipment is connected to the gas outlet of the electrolysis device, and the outlet is connected to the inlet of the humidification device.

9. A method for treating waste gas using the treatment system described in any one of claims 1-8, characterized in that, The method includes: The waste gas is introduced into the treatment system and then into a retention device to remove the inert gas from the waste gas. Then, a humidification device is introduced to humidify the exhaust gas; Then, an electrolysis device is introduced to oxidize the methane and hydrogen in the waste gas into carbon dioxide and water; Then, after passing through the carbon dioxide removal equipment, it is discharged externally.

10. The processing method according to claim 9, characterized in that, The relative humidity of the exhaust gas after being humidified by the humidification device is 60-80%.

11. The processing method according to claim 9, characterized in that, The electrolyte in the electrolysis device is a potassium salt or sodium salt solution.

12. The processing method according to claim 9, characterized in that, It also includes a gas detection step; The exhaust gas from the outlet of the electrolysis unit is monitored by monitoring equipment. If the monitoring results are satisfactory, the waste gas will be sent to the subsequent carbon dioxide removal equipment for treatment. If the monitoring result is unqualified, the conveying equipment will circulate the exhaust gas to the air inlet of the humidification device for rehumidification.

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