A method for treating radioactive waste tail gas using plasma technology

Abstract

The present invention relates to a method for treating radioactive waste tail gas by using plasma technology, comprising the steps of: performing plasma gasification and melting treatment on radioactive waste in a combustion chamber; solidifying the glass body, and desulfurizing and denitrifying the flue gas in a dry and water-free high-temperature catalytic ceramic filter; fully burning the unburned combustible materials in the flue gas in the second combustion chamber; the flue gas enters the SNCR denitrification device for denitrification; the flue gas enters the G-L heat exchanger for heat exchange; the flue gas enters the semi-dry quenching tower for heat exchange; the flue gas enters the bag filter for dust removal; the flue gas at the bag filter outlet is filtered through a high-efficiency combined filter. The beneficial effects of the present invention are: in the high-temperature section, most of the dust and ash are filtered out by the high-temperature catalytic ceramic filter, and then through the bag filter, most of the nuclides in the dust and fly ash are solidified by the glass body or intercepted in the fly ash, and the remaining small amount of I-129 and Tc-99 are purified by the high-efficiency combined filter; clean and qualified flue gas is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive waste treatment and disposal, and in particular relates to a method for treating radioactive waste tail gas by adopting plasma technology. Background Art

[0002] With the continuous development of nuclear power in my country, the total amount of radioactive waste generated during the operation and decommissioning of nuclear power plants will continue to increase in the future, and the requirements for nuclear safety will gradually increase. The research and development of high-volume and volume reduction treatment technologies for nuclear waste is urgent and challenging.

[0003] Compared with traditional treatment technologies, plasma gasification incineration volume reduction and solidification technology has a wider range of applications, faster reaction speed, less secondary pollution, small amount of tail gas and compact equipment; plasma gasification incineration volume reduction and solidification technology can achieve decomposition and gasification combustion of organic waste, high-temperature melting of inorganic waste and solidification of radioactive nuclides in one system, which can greatly reduce the volume of waste and the final waste obtained is relatively stable.

[0004] Plasma high temperature melting technology can be used in the treatment of nuclear power plants, nuclear facility operations and decommissioning waste; in the process of treating radioactive waste, plasma high temperature melting treatment technology has a very small flue gas volume compared to other incineration technologies, a large number of harmful heavy metals and radionuclides are solidified into the vitreous body, dioxins are very low, and secondary pollution is small. However, plasma high temperature melting technology also has NO X Therefore, the conventional SNCR+SCR technology is still used in the prior art, but the denitrification efficiency of this technology is not high enough, which will cause problems such as catalyst poisoning and ammonia escape;

[0005] In addition, for the treatment of dioxins, the traditional method mainly uses activated carbon to remove dioxins from exhaust gas, which requires the configuration of expensive injection devices; the removal efficiency of dioxins is affected by the fluctuation of feeding work; activated carbon adsorbs dioxins, but only transfers them to fly ash, and the total amount of dioxins does not decrease. The adsorption efficiency of activated carbon is closely related to factors such as the surface area of ​​activated carbon and the degree of mixing of flue gas. It is difficult to stabilize and completely control the adsorption efficiency of activated carbon. Fly ash contains dioxins and needs to be sent to the secondary treatment unit for further treatment to prevent dioxins from escaping again. The use of activated carbon will increase the risk of spontaneous combustion in the dust collector. The working principle of activated carbon is to adsorb rather than decompose dioxins, and the staff will also be in a dangerous environment.

[0006] Nuclear power plants have very high requirements for the final emission of flue gas pollutants: the dust concentration is required to be 8mg / m 3 Below, No x Emission concentration is 120mg / m 3The following: This requirement is too high for the current exhaust gas treatment system's disposal capacity; in addition, nuclear power plants also have very high requirements for the reliability and durability of equipment for long-term continuous and stable operation.

[0007] For the treatment process of low-level radioactive waste, there are still problems of high corrosiveness and high nuclide concentration: in nuclear power plants, more than 80% of radioactive nuclides (Cs, Sr, Co, etc.) exist in vitreous bodies and fly ash. The chlorine content in low-level radioactive waste resin is as high as 20%, which is extremely corrosive. At the same time, the nuclide concentration in the waste resin is also very high, which has a greater impact on the equipment. Therefore, higher requirements are placed on the safety, reliability and durability of the flue gas treatment system. The national standard stipulates that desulfurization wastewater is also radioactive waste because it is in contact with radioactive smoke and contains a large amount of radioactive nuclides. This part still needs secondary treatment under normal conditions. Summary of the invention

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for treating radioactive waste tail gas using plasma technology.

[0009] The method for treating radioactive waste tail gas using plasma technology comprises the following steps:

[0010] Step 1: After the radioactive waste is crushed, mixed and packaged, the feeding device transports the radioactive waste into a combustion chamber, where the radioactive waste is subjected to plasma gasification and melting treatment: the organic matter in the radioactive waste is decomposed to form X and H2 after gasification; inorganic substances in radioactive waste are melted by plasma to form glass;

[0011] Step 2: Use cement to solidify the glass body formed in step 1; the flue gas after gasification in step 1 enters the high-temperature catalytic ceramic filter, and the desulfurization agent and denitrification agent are sprayed into the high-temperature catalytic ceramic filter to desulfurize and denitrify the flue gas in the dry and water-free high-temperature catalytic ceramic filter to remove SO2 and part of NO in the flue gas. X , and dust removal is carried out on the flue gas at the same time;

[0012] Step 3, the flue gas obtained after the treatment in step 2 enters the secondary combustion chamber, and the unburned combustible substances in the flue gas are fully burned in the secondary combustion chamber;

[0013] Step 4: The flue gas discharged from the secondary combustion chamber outlet enters the SNCR denitrification device, and the ammonia water of the SNCR denitrification device is added to the residual NO in the flue gas discharged from the secondary combustion chamber. x Reaction, generating N2;

[0014] Step 5: Remove NO through step 4 xThe flue gas enters the GL heat exchanger, and the flue gas exchanges heat with the cooling water through the inner wall of the GL heat exchanger to reduce the temperature of the flue gas;

[0015] Step 6, the flue gas after heat exchange and cooling in step 5 enters the top of the semi-dry quenching tower through the flue, and is sprayed with cooling water through a double-fluid spray gun arranged on the top of the semi-dry quenching tower, and the flue gas exchanges heat with the cooling water droplets atomized by the double-fluid spray gun; the secondary waste in the semi-dry quenching tower is regularly cleaned and collected;

[0016] Step 7: The flue gas after the temperature is reduced by the semi-dry quenching tower enters the bag filter, and the bag filter performs secondary dust removal to remove dust and heavy metal particles in the flue gas;

[0017] Step 8: The flue gas at the bag filter outlet first passes through a high-efficiency combined filter to filter out particulate matter and dioxins with a particle size of 0.1 μm to 100 μm in the flue gas; the flue gas at the outlet of the high-efficiency combined filter is heated by a flue gas heater; the heated flue gas is drawn to the chimney through an induced draft fan for discharge.

[0018] Preferably, in step 2, the diameter of the ceramic fibers in the high-temperature catalytic ceramic filter is 2 to 3 microns; the ceramic fibers in the high-temperature catalytic ceramic filter are loaded with a denitration catalyst, and the denitration catalyst is a vanadium-based catalyst.

[0019] Preferably, in step 4, aqueous ammonia is sprayed into the SNCR denitrification device through a denitrification spray gun matched with the SNCR denitrification device.

[0020] Preferably, the bag filter in step 7 is a double dust removal redundant structure of bag and ceramic filter.

[0021] Preferably, the high-efficiency combined filter in step 8 is a three-stage filter consisting of an activated carbon adsorption carbon bed, a primary filter and a high-efficiency filter; the high-efficiency combined filter is provided with filter cotton and an activated carbon layer made of fireproof material inside to filter dust and aerosols in the exhaust gas and adsorb other pollutants, and the device has a good removal effect on radioactive nuclides.

[0022] Preferably, in step 8, a continuous online flue gas detection device and a radioactivity detection device are provided at the front end of the chimney to ensure that the pollutant concentration and radioactive substances in the flue gas leading to the chimney meet the emission standards.

[0023] The beneficial effects of the present invention are:

[0024] The method adopted by the present invention has high denitration efficiency and low ammonia escape, which solves the problem of NO XThe high concentration of NOx is high, and there are problems of high corrosion and high nuclide concentration. According to the data of the projects that have been put into operation, the equipment of the present invention is simple. The basic material of the high-temperature catalytic ceramic filter is ceramic fiber. The high-temperature catalytic ceramic filter has good high temperature resistance, corrosion resistance and wear resistance, and can well cope with the high-temperature and high-corrosive dust collection environment. It can operate stably and continuously for a long time, and the process reliability is extremely high. The denitration catalyst is evenly distributed in the ceramic fiber catalyst layer, and the loading capacity per unit volume is 5 times that of the traditional honeycomb SCR catalyst, and the catalytic activity is higher. NOx x The removal amount can meet 120mg / m 3 The following are the emission standards for nuclear power projects.

[0025] The present invention uses a high-temperature catalytic ceramic filter to carry out desulfurization and denitrification, which can achieve the separation of dust particles, acidic gases (SO2, HCL, HF) and NO X Synchronous control and coordinated management; desulfurization and denitrification operations can be realized simultaneously at 350-400℃; it can adapt to fluctuations in the operating environment; the desulfurization and denitrification dust removal efficiency is high, which can ensure that the dust emission concentration is less than 5mg / Nm 3 , ensuring that the treated tail gas emissions meet the standards; eliminating the conventional scrubber desulfurization equipment, making the overall process more concise and efficient. The most important thing is that no desulfurization wastewater is generated, and there is no need to consider the radionuclides inside the wastewater, which greatly solves the problem of secondary wastewater discharge.

[0026] The present invention adopts a jacketed GL heat exchanger, and utilizes the flue gas in the interlayer to exchange heat with the flue gas in the inner tube. At the same time, the heavier particles in the flue gas are settled under the action of gravity; soft water enters the heat exchanger jacket from the lower part of the heat exchanger, and then discharges the heat exchanger from the upper part to achieve the heat exchange effect; under the premise of ensuring the heat exchange effect, it is not easy to be blocked and dust is accumulated, and the operation of the equipment is more stable and reliable.

[0027] The present invention first filters out most of the dust and ash in the high temperature section through a high temperature catalytic ceramic filter, and then processes the dust and fly ash for a second time through a bag filter. Most of the nuclides in the dust and fly ash are solidified by the glass produced by the high temperature melting of the plasma or are intercepted in the fly ash. The remaining small amount of I-129 and Tc-99 can be further purified by a high efficiency combined filter. The present invention sets a continuous online flue gas detection device and a radioactivity detection device at the front end of the chimney; the present invention ensures that the pollutant concentration and radioactivity meet the standards through these three treatment methods, and finally the clean and qualified flue gas is drawn out by the induced draft fan and discharged into the chimney.

[0028] The method of the present invention has a short process flow, and dust removal, filtration and denitrification are carried out under high temperature conditions at the front end of the flue gas system, which greatly reduces the disposal pressure of subsequent equipment. The method of the present invention has low energy consumption and obvious comprehensive advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a flow chart of the tail gas treatment method of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0031] Example 1

[0032] like Figure 1 As shown, a method for treating radioactive waste tail gas using plasma technology specifically comprises the following steps:

[0033] Step 1: After the radioactive waste is crushed, mixed and packaged, the feeding device transports the radioactive waste into a combustion chamber, where the radioactive waste is subjected to plasma gasification and melting treatment: the organic matter in the radioactive waste is decomposed to form X and H2 after gasification; inorganic substances in radioactive waste are treated by plasma melting to form glass (most of the heavy metals (cadmium, lead, arsenic, etc.) and nuclides (Cs, Sr, Co, etc.) are solidified in the glass); the outlet temperature of a combustion chamber is about 400°C, and the amount of flue gas generated by the plasma gasification and melting treatment of the present invention is only about one third of the amount of flue gas generated by conventional incineration technology;

[0034] Step 2: Use cement to solidify the glass body formed in step 1, so that the radioactive waste in the glass body is reduced in volume and solidified; the flue gas after gasification in step 1 enters the high-temperature catalytic ceramic filter, and the desulfurizer and denitrifier are sprayed into the high-temperature catalytic ceramic filter. The flue gas at 400°C is desulfurized and denitrified in the dry and water-free high-temperature catalytic ceramic filter through a high-temperature desulfurization, dust removal and denitrification integrated process (existing technology). The basic material of the high-temperature catalytic ceramic filter is ceramic fiber, which is pressed by a mold under high temperature and high pressure. The diameter of the ceramic fiber in the high-temperature catalytic ceramic filter is 2 to 3 microns, and the extremely fine ceramic fiber can enhance the filtration and removal efficiency; the denitrification catalyst (vanadium-based catalyst) is evenly distributed in the ceramic fiber catalytic layer to remove SO2 and part of NO in the flue gas. X , and dust removal is carried out on the flue gas at the same time;

[0035] As the flue gas flows through the ceramic fiber, the Ca(OH)2 carried by the flue gas is evenly distributed on the surface of the ceramic fiber, forming a large desulfurization reaction surface area. The acidic gas molecules such as SO2 carried by the flue gas are more easily adsorbed and removed on the surface of the powder layer of the ceramic filter tube, so that the SO2 in the flue gas reacts with Ca(OH)2 to generate CaSO3 and CaSO4, which has a higher desulfurization efficiency; NO in the flue gas X When NH3 passes through the fine ceramic fiber catalyst layer, it directly contacts the denitration catalyst to produce N2 and H2O. During this reaction, the exhaust gas passes through the denitration catalyst for about 2 to 5 times longer than the traditional SCR. The contact time is very long, which can more effectively reduce NO in the flue gas. X ; In actual engineering applications, it is found that after the desulfurizer is sprayed into the flue, it reacts with SO2 in the flue. At the same time, the unreacted desulfurizer deposited on the surface of the ceramic fiber of the high-temperature catalytic ceramic filter reacts with the residual SO2 in the flue gas, and the desulfurization rate is extremely high. Since the flue gas must pass through the surface of the ceramic fiber, the ceramic fiber can be regarded as a fixed bed reactor.

[0036] Denitrification catalyst in removing NO from flue gas X At the same time, dioxins can also be removed: dioxins react with oxygen and are decomposed into non-toxic substances such as CO2, H2O, HCL and discharged; the high-temperature catalytic ceramic filter also removes HF contained in the flue gas, and the dust removal treatment removes the desulfurization ash and dust particles in the flue gas, and can remove most of the dust in the high-temperature flue gas; the high-temperature catalytic ceramic filter used in the present invention is used as a high-temperature flue gas purification equipment, which overcomes the shortcomings that traditional bag dust collectors cannot be used in high-temperature environments and traditional electrostatic precipitators cannot control stable ultra-low dust emissions; extremely fine ceramic fibers can enhance filtering and removal efficiency; the high-temperature catalytic ceramic filter is resistant to high temperature, corrosion and wear, and its resistance to high temperature and corrosive chemicals is better than that of traditional bag dust collectors; the high-temperature catalytic ceramic filter has a simple process for desulfurization and dust removal of flue gas, a fast reaction speed, and a high desulfurization, denitrification and dust removal efficiency (can ensure that the dust emission concentration is less than 5mg / Nm 3 ), the system has low energy consumption and no wastewater, which is very suitable for flue gas purification processes with small flue gas flow;

[0037] Step 3: The flue gas obtained after the treatment in step 2 enters the secondary combustion chamber, and the unburned combustible substances (such as H2) in the flue gas are fully burned in the secondary combustion chamber; the outlet flue gas temperature of the secondary combustion chamber is about 1100°C;

[0038] Step 4: The flue gas (completely burned flue gas) discharged from the outlet of the secondary combustion chamber enters the SNCR denitrification device, which is equipped with a denitrification spray gun. The denitrification spray gun sprays ammonia water into the SNCR denitrification device, and the ammonia water added to the SNCR denitrification device and the residual NO in the flue gas discharged from the secondary combustion chamber xReaction, generating N2 which is harmless to the atmosphere, consuming part of the NO in the flue gas x , solving the NO generated by plasma technology x The problem of higher concentrations;

[0039] Step 5: Remove NO through step 4 x The flue gas enters the GL heat exchanger. The inlet flue gas temperature of the GL heat exchanger is 1000℃. The flue gas exchanges heat with the cooling water through the inner wall of the GL heat exchanger. While increasing the cooling water temperature, the flue gas temperature is reduced to 550℃. The GL heat exchanger is a jacketed type. The cooling water enters the jacket of the GL heat exchanger from the bottom of the GL heat exchanger and then discharges the GL heat exchanger from the top. The jacketed GL heat exchanger uses the flue gas in the interlayer to exchange heat with the flue gas in the inner tube to achieve the heat exchange effect. At the same time, the heavier particles in the flue gas settle under the action of gravity.

[0040] Step 6, the flue gas (about 550°C) after heat exchange and cooling in step 5 enters the top of the semi-dry quench tower through the flue, and is sprayed with cooling water through a dual-fluid spray gun arranged on the upper part of the semi-dry quench tower. The flue gas fully exchanges heat with the cooling water droplets atomized by the dual-fluid spray gun, and the droplets quickly absorb heat and evaporate in a short time, and the flue gas temperature is instantly reduced to below 200°C. The flue gas temperature after cooling quickly crosses the low-temperature resynthesis zone of dioxins within 1 second; the secondary waste in the semi-dry quench tower is regularly cleaned and collected;

[0041] Step 7: The flue gas after the temperature is reduced by the semi-dry quenching tower enters the bag filter, which performs secondary dust removal to remove dust and heavy metal particles in the flue gas; the bag filter has a double dust removal redundant structure of bag and ceramic filter, which ensures that most of the dust in the flue gas is removed and the flue gas meets the emission standards;

[0042] Step 8. The flue gas at the bag filter outlet first passes through a high-efficiency combined filter to filter out particulate matter with a particle size of 0.1μm to 100μm and harmful substances such as dioxins in the flue gas, so as to meet the process waste gas emission standards; the high-efficiency combined filter is a three-stage filter composed of an activated carbon adsorption carbon bed, a primary filter and a high-efficiency filter; in order to meet the flue gas inlet temperature requirements and prevent the plume phenomenon, the outlet flue gas of the high-efficiency combined filter is heated by a flue gas heater (electric heating method); the heated flue gas is drawn to the chimney through the induced draft fan for discharge; a filter cotton and an activated carbon layer made of fireproof material are arranged inside the high-efficiency combined filter to filter dust and aerosols in the exhaust gas and adsorb other pollutants, and the equipment has a good removal effect on radioactive nuclides; a flue gas continuous online detection device (CEMS) and a radioactivity detection device are arranged at the front end of the chimney to ensure that the pollutant concentration and radioactive substances in the flue gas leading to the chimney can meet the emission standards.

[0043] Example 2

[0044] Since plasma technology is used to treat radioactive waste, it has only been put into use in the Hainan Nuclear Power Plant, which is the first nuclear power project in China. There is no successful radioactive waste engineering application case. Therefore, this embodiment uses the Shandong Biomass 130t Boiler Power Plant as a case for explanation:

[0045] The original process route of Shandong biomass 130t boiler power plant is: boiler (SNCR) -> economizer -> air preheater -> long flue -> cyclone + bag filter - induced draft fan -> wet desulfurization tower -> chimney;

[0046] The process route obtained by combining the modification of the present invention in this embodiment is: boiler (SNCR) -> baking soda dry desulfurization (flue injection) -> reserved ammonia injection device -> high temperature catalytic ceramic filter -> economizer -> air preheater -> induced draft fan -> chimney; this embodiment cancels the wet desulfurization tower in the original process and adopts a high temperature catalytic ceramic filter; the pilot data obtained are: the dust concentration at the outlet is 1.3 mg / Nm 3 , NO X Removal efficiency>87.7%.

[0047] It can be seen that this embodiment uses a high-temperature catalytic ceramic filter to perform desulfurization and denitrification, which can achieve the separation of dust particles, acidic gases and NO X Synchronous control and coordinated management; desulfurization and denitrification operations can be realized simultaneously; it can adapt to fluctuations in the operating environment; the desulfurization and denitrification dust removal efficiency is high, which can ensure that the dust emission concentration is less than 5mg / Nm 3 , ensuring that the treated tail gas emissions meet the standards; eliminating the conventional scrubbing tower desulfurization equipment, making the overall process more simple and efficient, and most importantly, no desulfurization wastewater is produced, completely solving the problem of desulfurization wastewater treatment difficulties.

[0048] Example 3

[0049] Since the plasma technology is used to treat radioactive waste, it has only been put into use in the Hainan Nuclear Power Plant, which is the first nuclear power project. There is no successful radioactive waste engineering application case. Therefore, this embodiment uses a hazardous waste incineration plant as a case for explanation:

[0050] A hazardous waste incineration plant added a high-temperature ceramic filter at the outlet of the secondary combustion chamber and connected it in series to the flue gas treatment circuit; after comparative testing, the highest initial concentration of dioxins before the transformation was 7.5ngTEQ / Nm 3 After modification and adding high-temperature ceramic filters, the emission concentration is 0.004ngTEQ / Nm 3 , the emission concentration is only 1 / 25 of the EU standard. The dioxin removal effect has been greatly improved.

[0051] From the above, it can be seen that the denitrification catalyst sprayed into the high-temperature ceramic filter is effective in removing NO from the flue gas. X At the same time, it can also remove dioxins.

Claims

1. A method for treating radioactive waste tail gas using plasma technology, characterized in that: The following steps are involved: Step 1: After the radioactive waste is crushed, mixed and packaged, the feeding device transports the radioactive waste into a combustion chamber, where the radioactive waste is subjected to plasma gasification and melting treatment: the organic matter in the radioactive waste is decomposed to form X and H2 after gasification; inorganic substances in radioactive waste are melted by plasma to form glass; Step 2: Use cement to solidify the glass body formed in step 1; the flue gas after gasification in step 1 enters the high-temperature catalytic ceramic filter, and the desulfurization agent and denitrification agent are sprayed into the high-temperature catalytic ceramic filter to desulfurize and denitrify the flue gas in the dry and water-free high-temperature catalytic ceramic filter to remove SO2 and part of NO in the flue gas. X , and dust removal is carried out on the flue gas at the same time; Step 3, the flue gas obtained after the treatment in step 2 enters the secondary combustion chamber, and the unburned combustible substances in the flue gas are fully burned in the secondary combustion chamber; Step 4: The flue gas discharged from the secondary combustion chamber outlet enters the SNCR denitrification device, and the ammonia water of the SNCR denitrification device is added to the residual NO in the flue gas discharged from the secondary combustion chamber. x Reaction, generating N2; Step 5: Remove NO through step 4 x The flue gas enters the GL heat exchanger, and the flue gas exchanges heat with the cooling water through the inner wall of the GL heat exchanger to reduce the temperature of the flue gas; Step 6, the flue gas after heat exchange and cooling in step 5 enters the top of the semi-dry quenching tower through the flue, and is sprayed with cooling water through a double-fluid spray gun arranged on the top of the semi-dry quenching tower, and the flue gas exchanges heat with the cooling water droplets atomized by the double-fluid spray gun; the secondary waste in the semi-dry quenching tower is regularly cleaned and collected; Step 7: The flue gas after the temperature is reduced by the semi-dry quenching tower enters the bag filter, and the bag filter performs secondary dust removal to remove dust and heavy metal particles in the flue gas; Step 8: The flue gas at the bag filter outlet first passes through a high-efficiency combined filter to filter out particulate matter and dioxins with a particle size of 0.1 μm to 100 μm in the flue gas; the flue gas at the outlet of the high-efficiency combined filter is heated by a flue gas heater; the heated flue gas is drawn to the chimney through an induced draft fan for discharge.

2. The method for treating radioactive waste tail gas using plasma technology according to claim 1, characterized in that: In step 2, the diameter of the ceramic fibers in the high-temperature catalytic ceramic filter is 2 to 3 microns; the ceramic fibers in the high-temperature catalytic ceramic filter are loaded with a denitration catalyst, and the denitration catalyst is a vanadium-based catalyst.

3. The method for treating radioactive waste tail gas using plasma technology according to claim 1, characterized in that: In step 4, ammonia water is sprayed into the SNCR denitrification device through a denitrification spray gun matched with the SNCR denitrification device.

4. The method for treating radioactive waste tail gas using plasma technology according to claim 1, characterized in that: The bag filter in step 7 is a double dust removal redundant structure of bag and ceramic filter.

5. The method for treating radioactive waste tail gas using plasma technology according to claim 1, characterized in that: In step 8, the high-efficiency combined filter is a three-stage filter consisting of an activated carbon adsorption carbon bed, a primary filter and a high-efficiency filter; filter cotton and an activated carbon layer made of fireproof material are arranged inside the high-efficiency combined filter.

6. The method for treating radioactive waste tail gas using plasma technology according to claim 1, characterized in that: In step 8, a continuous online flue gas detection device and a radioactivity detection device are provided at the front end of the chimney.

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