Method and apparatus for the treatment of radioactive waste organic phases

Abstract

The present application relates to nuclear chemical reprocessing technical field, disclose a kind of method and device for processing radioactive waste organic phase, the method comprises: to the supergravity rotating bed is added waste organic phase liquid, and to the supergravity rotating bed is sent with heat, under the supergravity effect generated by supergravity rotating bed rotation, vapor-liquid mass transfer heat transfer is fully separated out nuclide metal complex, mixture of tributyl phosphate / kerosene and kerosene.The device includes supergravity rotating bed, heavy component tank, tributyl phosphate / kerosene product tank, reflux tank, and reflux pump connected with reflux tank, and kerosene product tank connected with reflux pump, and reflux pump is also communicated with supergravity rotating bed.The present application is when working, vapor-liquid interface renewal speed is fast under supergravity environment, generates huge phase interface, so it strengthens the transfer efficiency, mixture can be separated in short time;In addition, the process equipment volume is small, process flow is simple, and operating cost is low.

Description

Technical Field

[0001] This invention belongs to the field of nuclear chemical reprocessing, specifically relating to a method and apparatus for treating the organic phase of radioactive waste. Background Technology

[0002] Nuclear energy, as an important energy source for solving human energy problems, has been widely used in many countries around the world, and the proportion of nuclear power generation in my country is also steadily increasing. With the rapid development of my country's nuclear power industry, the importance of spent fuel reprocessing is becoming increasingly prominent. To maintain the sustainable application of nuclear energy, my country implements a closed-loop nuclear fuel cycle. Currently, the Purex spent fuel reprocessing process is mainly used. This process uses an extractant composed of a 25%-30% tributyl phosphate / kerosene (TBP / OK) mixture in a nitric acid system to extract and recover uranium and plutonium. During the uranium and plutonium extraction and recovery process, tributyl phosphate (TBP) undergoes acid-catalyzed hydrolysis and radionuclide irradiation decomposition to produce dibutyl phosphate (DBP), monobutyl phosphate (MBP), and phosphoric acid, etc. The main products of kerosene (OK) irradiation decomposition are ketones, alkyl acids, nitrosanes, nitrosamines, and nitrate esters, etc. The products of the above hydrolysis and decomposition can also polymerize to form a series of long-chain esters, as well as complex with fission nuclides to form heavy nuclide-metal complexes.

[0003] The Prex process employs an alkaline washing and regeneration process to treat used extractant, reducing the operating costs of TBP and kerosene. The alkaline washing process is effective in removing DBP, MBP, and acidic radiolysis products, but its effectiveness in removing long-chain esters and radionuclide metal complexes is limited. After prolonged operation of the reprocessing facility, the accumulation of long-chain esters and radionuclide metal complexes in the organic phase of the system gradually increases. These substances significantly retain radionuclide metals, causing a decline in the extraction efficiency of the extractant in the Prex process. Therefore, the extractant needs to be replaced after a period of use, resulting in a large amount of radioactive waste organic phase.

[0004] One of the important goals and principles of radioactive waste management is waste minimization. The main components of the waste organic phase are tributyl phosphate (TBP) and kerosene (OK). In order to reduce the volume of the radioactive waste organic phase and recover tributyl phosphate (TBP) and kerosene, the waste organic phase needs to be treated to separate radionuclides and radiolysis products, and recover tributyl phosphate (TBP) and kerosene.

[0005] Radioactive organic waste is generally treated using distillation. Distillation utilizes the differences in relative volatility between components in a mixed liquid to separate the components through vapor-liquid mass and heat transfer within the distillation unit. For example, patent CN113571223A uses a traditional distillation column to treat radioactive organic waste liquid. In traditional distillation columns (packed columns, plate columns, etc.), the vapor and liquid phases contact under gravity, resulting in slow liquid flow, a small liquid film area, slow interface renewal, and a low mass transfer coefficient. This leads to a relatively high height of the distillation column and a correspondingly high cost. Furthermore, this patent employs a two-stage distillation process, making the process flow complex. Tributyl phosphate (TBP) is a heat-sensitive substance and is prone to decomposition and deterioration when exposed to the high-temperature environment of distillation for extended periods, severely affecting the operation of the distillation column. Summary of the Invention

[0006] In view of this, the present invention provides a method and apparatus for treating radioactive waste organic phase, in order to solve the problems of complex process, high operating cost and low efficiency of traditional distillation process.

[0007] In a first aspect, the present invention provides a method for treating radioactive waste organic phase, comprising: adding waste organic phase liquid to a centrifugal rotating bed and supplying heat to the centrifugal rotating bed, wherein under the action of centrifugal force generated by the rotation of the centrifugal rotating bed, the vapor and liquid undergo sufficient mass and heat transfer, and the mixture of nuclide metal complex, tributyl phosphate / kerosene and kerosene are separated.

[0008] Beneficial effects: Under the high gravity environment generated by the rotating bed, the vapor and liquid achieve high dispersion, high mixing, and strong turbulence, resulting in rapid interface renewal and the formation of a large phase interface, which enhances the transfer efficiency and allows the mixture to be separated in a short time. It also improves the situation of TBP oxidation, deterioration, and coking during the distillation separation of waste organic phases, and is suitable for the separation of heat-sensitive radioactive waste organic phases. In addition, compared with traditional distillation columns, the volume of the rotating bed is reduced by tens of times, which reduces engineering costs and significantly shortens the process route, thus reducing operating costs.

[0009] In one optional embodiment, the nuclide-metal complex separated and collected from the bottom collection port of the supergravity rotating bed is cooled and metered before being collected into a recombinant tank. The tributyl phosphate / kerosene mixture collected from the upper middle collection port of the supergravity rotating bed is condensed and metered before being collected into a tributyl phosphate / kerosene product tank. The kerosene collected from the top collection port of the supergravity rotating bed is condensed before entering a reflux tank.

[0010] Beneficial effects: The mixture of tributyl phosphate / kerosene and kerosene are collected in the gas phase from the higher collection port, while the heavier nuclide metal complex is collected in the liquid phase from the lower collection port.

[0011] In one alternative embodiment, a portion of the kerosene entering the return tank is returned to the high-gravity rotating bed via flow control, while the remaining kerosene is fed into a kerosene product tank for storage.

[0012] Beneficial effects: By continuously refluxing the kerosene into the high-gravity rotating bed through the reflux tank, the refluxed liquid undergoes multiple mass transfers with the rising steam, which can improve the purity of the kerosene.

[0013] In one optional embodiment, when the liquid sampling result in the reflux tank meets the requirement that the tributyl phosphate content is ≤0.02% vol, the reflux ratio is set to 0.2-6, so that a portion of the kerosene is returned to the high-gravity rotating bed as reflux, and the remaining portion of the kerosene is collected in the kerosene product tank.

[0014] Beneficial effects: The higher the purity of the kerosene collected in the reflux tank, the better. In this application, the kerosene has a higher purity when the content of tributyl phosphate in the kerosene is <0.02%. The kerosene is refluxed according to the set reflux ratio, and the remainder is collected.

[0015] In one alternative embodiment, the kerosene condensation temperature is 20°C-60°C; and / or, the condensation temperature of the tributyl phosphate / kerosene mixture is 20°C-60°C; and / or, the cooling temperature of the nuclide metal complex is 20°C-60°C.

[0016] Beneficial effects: The mixture of kerosene and tributyl phosphate / kerosene becomes a liquid phase after condensation, making it easy to collect. Nuclide-metal complexes are suitable for collection after cooling.

[0017] In one optional embodiment, the supergravity rotating bed and the supergravity rotating bed reboiler are interconnected. The waste organic phase liquid entering the supergravity rotating bed reboiler from the supergravity rotating bed is partially vaporized after being heated by the supergravity rotating bed reboiler to form a vaporized phase.

[0018] The vaporized phase enters the supergravity rotating bed reboiler to provide heat for vapor-liquid mass and heat transfer. The unvaporized liquid after heating in the supergravity rotating bed reboiler is a nuclide-metal complex, which is collected after cooling.

[0019] The heating temperature of the supergravity rotating bed reboiler is 110℃-150℃.

[0020] Beneficial effects: The reboiler in a high-gravity rotating bed can provide heat for vapor-liquid mass transfer and heat transfer to the high-gravity rotating bed.

[0021] In one optional embodiment, a preheater is used to preheat the radioactive waste organic phase, and the preheated radioactive waste organic phase is input into the high gravity rotating bed for treatment, wherein the temperature of the preheater is 60℃-120℃.

[0022] And / or, the motor speed of the supergravity rotating bed is 100 r / min-2000 r / min;

[0023] And / or, a vacuum pressure is generated during the treatment of radioactive waste organic phase by a vacuum pump unit, with the pressure controlled between 200Pa and 2000Pa.

[0024] Beneficial effects: The preheater provides heat to preheat the radioactive waste organic phase, reducing heat consumption in the high-gravity rotating bed reboiler. Negative pressure distillation lowers the boiling point of the material, allowing the liquid to evaporate rapidly.

[0025] Secondly, the present invention also provides an apparatus for treating radioactive waste organic phase, comprising: a high-gravity rotating bed supplied with heat, a recombinant fraction tank connected to the bottom collection port of the high-gravity rotating bed, a tributyl phosphate / kerosene product tank connected to the upper middle collection port of the high-gravity rotating bed, a reflux tank connected to the top collection port of the high-gravity rotating bed, a reflux pump connected to the reflux tank, and a kerosene product tank connected to the reflux pump, wherein the reflux pump is also connected to the high-gravity rotating bed.

[0026] Beneficial effects: The use of a rotating bed distillation system with high gravity achieves high dispersion, high mixing, and strong turbulence in the high gravity environment generated by the rotating bed. As a result, the interface renewal rate is fast, a huge phase interface is generated, and the transfer efficiency is enhanced, allowing the mixture to be separated in a short time. It improves the situation of TBP oxidation, deterioration, and coking during the distillation and separation of waste organic phases, and is suitable for the separation of heat-sensitive radioactive waste organic phases. In addition, compared with traditional distillation columns, the volume of the rotating bed with high gravity is reduced by tens of times, which reduces engineering costs and significantly shortens the process route, thus reducing operating costs.

[0027] In one optional embodiment, the apparatus for treating radioactive waste organic phase further includes a supergravity rotating bed reboiler interconnected with the supergravity rotating bed. The recombining tank is connected to the bottom of the supergravity rotating bed via the supergravity rotating bed reboiler, which is at least used to provide heat for vapor-liquid mass transfer and heat transfer to the supergravity rotating bed.

[0028] Beneficial effects: The reboiler in a high-gravity rotating bed can provide heat for vapor-liquid mass transfer and heat transfer to the high-gravity rotating bed.

[0029] The device for treating radioactive waste organic phase also includes a waste organic phase tank, a feed metering pump, and a preheater connected in sequence, and the preheater is also connected to the ultragravity rotating bed.

[0030] Beneficial effects: The preheater provides heat to preheat the organic phase of radioactive waste, which can reduce the heat consumption of the ultragravity rotating bed reboiler.

[0031] In one alternative embodiment, the bottom of the high-gravity rotating bed reboiler is connected to the heavy component tank via a heavy component cooler.

[0032] The upper part of the high-gravity rotating bed is connected to the tributyl phosphate / kerosene product tank via a tributyl phosphate / kerosene condenser.

[0033] And / or, the top of the high gravity rotating bed is connected to the reflux tank via a kerosene condenser, which is connected to a negative pressure generating assembly for providing a negative pressure environment for the device, wherein the negative pressure generating assembly includes a vacuum pump buffer tank and a vacuum pump unit, and the kerosene condenser, the vacuum pump buffer tank and the vacuum pump unit are connected in sequence;

[0034] And / or, the supergravity rotating bed is selected from at least one of the multi-layer baffle rotating bed and the multi-layer rotating packed bed.

[0035] Beneficial effects: The mixture of kerosene and tributyl phosphate / kerosene, after condensation, becomes a liquid phase, facilitating collection. The nuclide-metal complex is ultimately collected from the bottom of the centrifugal rotating bed reboiler and, after cooling, is suitable for collection. Negative pressure distillation lowers the boiling point of the material, allowing the liquid to evaporate rapidly. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of the device for treating radioactive waste organic phase according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Waste organic phase tank; 2. Feed metering pump; 3. Preheater; 4. High gravity rotating bed reboiler; 5. Heavy component cooler; 6. Heavy component tank; 7. High gravity rotating bed; 8. Kerosene condenser; 9. Reflux tank; 10. Reflux pump; 11. Tributyl phosphate / kerosene condenser; 12. Tributyl phosphate / kerosene product tank; 13. Kerosene product tank; 14. Vacuum pump buffer tank; 15. Vacuum pump unit. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0042] According to an embodiment of the present invention, in one aspect, an apparatus for treating radioactive waste organic phase is provided, comprising: a high-gravity rotating bed 7 subjected to heat, a recombinant fraction tank 6 connected to the bottom collection port of the high-gravity rotating bed 7, a tributyl phosphate / kerosene product tank 12 connected to the upper middle collection port of the high-gravity rotating bed 7, a reflux tank 9 connected to the top collection port of the high-gravity rotating bed 7, a reflux pump 10 connected to the reflux tank 9, and a kerosene product tank 13 connected to the reflux pump 10, wherein the reflux pump 10 is also connected to the high-gravity rotating bed 7.

[0043] Distillation using a rotating bed 7 under high gravity conditions achieves high dispersion, high mixing, and strong turbulence in the vapor-liquid mixture. As a result, the interface renewal rate is fast, a huge phase interface is generated, and the transfer efficiency is enhanced, allowing the mixture to be separated in a short time.

[0044] It improves the oxidation, deterioration, and coking of tributyl phosphate (TBP) during the distillation and separation of waste organic phases, and is suitable for the separation of heat-sensitive radioactive waste organic phases;

[0045] In addition, compared with traditional distillation columns, the volume of the high gravity rotating bed 7 is reduced by tens of times, which reduces engineering costs and significantly shortens the process route, thus reducing operating costs.

[0046] By continuously refluxing the liquid from the reflux tank 9 into the high-gravity rotating bed 7, the refluxed liquid undergoes multiple mass transfers with the rising steam, which can improve the purity of the collected kerosene.

[0047] In one embodiment, the apparatus for treating radioactive waste organic phase further includes a supergravity rotating bed reboiler 4 interconnected with the supergravity rotating bed 7. The recombining tank 6 is connected to the bottom of the supergravity rotating bed 7 through the supergravity rotating bed reboiler 4, and the supergravity rotating bed reboiler 4 provides at least some heat for vapor-liquid mass transfer and heat transfer to the supergravity rotating bed 7.

[0048] The device for treating radioactive waste organic phase also includes a waste organic phase tank 1, a feed metering pump 2 and a preheater 3 connected in sequence. The preheater 3 is also connected to a high-gravity rotating bed 7.

[0049] Preheater 3 provides heat to preheat the radioactive waste organic phase, which can reduce the heat consumption of the supergravity rotating bed reboiler 4.

[0050] In one embodiment, the bottom collection port of the rotating bed 7 is connected to the heavy component tank 6 via a heavy component cooler 5. More specifically, the rotating bed 7, the rotating bed reboiler 4, the heavy component cooler 5, and the heavy component tank 6 are connected in sequence, and the rotating bed reboiler 4 and the rotating bed 7 are interconnected. The upper collection port of the rotating bed 7 is connected to the tributyl phosphate / kerosene product tank 12 via a tributyl phosphate / kerosene condenser 11.

[0051] The top collection port of the high-gravity rotating bed 7 is connected to the return tank 9 via a kerosene condenser 8. The kerosene condenser 8 is connected to a negative pressure generating component for providing a negative pressure environment for the device. The negative pressure generating component includes a vacuum pump buffer tank 14 and a vacuum pump unit 15. The kerosene condenser 8, the vacuum pump buffer tank 14, and the vacuum pump unit 15 are connected in sequence.

[0052] The high-gravity rotating bed 7 is selected from at least one of the multi-layer baffle rotating bed and the multi-layer rotating packed bed. The packing used in the rotating packed bed is structured packing, which includes corrugated metal structured packing, finned guide plate structured packing, etc. The most preferred packing is corrugated metal structured packing. The inner diameter range of the structured packing is 50mm-400mm, and the outer diameter range is 100mm-1500mm.

[0053] Kerosene and tributyl phosphate / kerosene are condensed into a liquid phase, which is easy to collect; radionuclide metal complexes are suitable for collection after cooling; negative pressure is generated by a negative pressure generating component, and distillation under negative pressure can lower the boiling point of the material and make the liquid evaporate quickly.

[0054] The working principle of this radioactive waste organic phase treatment device is as follows:

[0055] First, start the vacuum pump unit 15 to evacuate the process system and control the system pressure at 200Pa-2000Pa (e.g., 300Pa, 500Pa, 1000Pa, etc.); add the prepared waste organic phase simulation liquid (TBP content 27%, kerosene content 72%, dodecyl phosphate 1%) to the waste organic phase tank 1; use the feed metering pump 2 to deliver the simulation liquid to the preheater 3 at a set flow rate (e.g., 100L / h), and control the temperature of the preheater 3 at 60℃-120℃ (e.g., 80℃, 100℃, 110℃, etc.); start the multi-layer gravity rotation and adjust its motor speed to 100r / min-2000r / min (e.g., 800r / min, 1000r / min, 1500r / min, etc.);

[0056] The preheated waste organic phase simulated liquid enters the high gravity rotating bed 7. The high gravity rotating bed reboiler 4 gradually builds up the liquid level. The liquid level in the high gravity rotating bed reboiler 4 is controlled at 0.8 meters above the heating tube of the high gravity rotating bed reboiler 4 and the feeding stops. The heating temperature of the high gravity rotating bed reboiler 4 is controlled at 110℃-150℃ (such as 120℃, 130℃, 140℃, etc.). After being heated by the high gravity rotating bed reboiler 4, the waste organic phase liquid partially vaporizes to form a vapor phase. The vapor phase enters the high gravity rotating bed 7 from the high gravity rotating bed reboiler 4 to provide heat for vapor-liquid mass and heat transfer. The liquid that does not vaporize after being heated in the high gravity rotating bed reboiler 4 is a nuclide metal complex. The nuclide metal complex is collected after being cooled by the heavy component cooler 5.

[0057] The vaporized phase enters the high-gravity rotating bed 7, causing the waste organic phase to vaporize and generate rising steam. Part of the rising steam enters the kerosene condenser 8 for condensation. The temperature of the kerosene condenser 8 is controlled at 20℃-60℃ (e.g., 30℃, 40℃, 50℃, etc.). Part of the rising steam enters the tributyl phosphate / kerosene condenser 11 for condensation. The temperature of the tributyl phosphate / kerosene condenser 11 is controlled at 20℃-60℃ (e.g., 30℃, 40℃, 50℃, etc.). The generated condensate enters the reflux tank 9, and the non-condensable gas is drawn away by the vacuum pump unit 15 through the vacuum pump buffer tank 14.

[0058] The reflux tank 9 begins to build up its liquid level. Once the level reaches 40%-60%, the reflux pump 10 is turned on to perform a full reflux operation. The liquid in the reflux tank 9 is refluxed back to the high-gravity rotating bed 7. The steam flow rate of the high-gravity rotating bed reboiler 4 is adjusted to maintain a stable liquid level in the reflux tank 9. The full reflux operation is maintained, and the liquid in the reflux tank 9 is sampled periodically. When the liquid sampling result in the reflux tank 9 meets the requirement that the tributyl phosphate (TBP) content is ≤0.02% vol, the liquid in the reflux tank 9 is collected and transferred to the kerosene product tank 13 at a reflux ratio of 0.2-6 (e.g., 2.5, 3, 4, etc.).

[0059] Throughout the process, the temperature of the tributyl phosphate / kerosene mixture at the outlet of the rotating bed 7 was monitored. When the temperature reached 85-95℃, the extracted samples were analyzed. If the tributyl phosphate (TBP) content in the samples was ≥80% vol, the tributyl phosphate / kerosene mixture was extracted. The extracted tributyl phosphate / kerosene mixture was condensed to 30℃ and then collected into the tributyl phosphate / kerosene product tank 12.

[0060] According to an embodiment of the present invention, in another aspect, a method for treating radioactive waste organic phase is provided, comprising: adding waste organic phase liquid to a centrifugal rotating bed 7 and supplying heat to the centrifugal rotating bed 7, wherein under the action of centrifugal force generated by the rotation of the centrifugal rotating bed 7, the vapor and liquid undergo sufficient mass and heat transfer, and the mixture of nuclide metal complex, tributyl phosphate / kerosene and kerosene are separated.

[0061] In the hypergravity environment generated by the rotating bed 7, the vapor and liquid achieve high dispersion, high mixing, and strong turbulence, resulting in rapid interface renewal and the formation of a large phase interface, which enhances the transfer efficiency and allows the mixture to be separated in a short time. It also improves the situation of oxidative deterioration and coking of tributyl phosphate (TBP) during the distillation separation of waste organic phases, making it suitable for the separation of thermosensitive radioactive waste organic phases. In addition, compared with traditional distillation columns, the volume of the rotating bed 7 is reduced by tens of times, which reduces engineering costs and significantly shortens the process route, thereby reducing operating costs.

[0062] In one embodiment, the nuclide-metal complex separated and collected from the bottom collection port of the centrifugal rotating bed 7 is collected into the recombination tank 6 after cooling and metering. The tributyl phosphate / kerosene mixture collected from the middle and upper collection port of the centrifugal rotating bed 7 is collected into the tributyl phosphate / kerosene product tank 12 after condensation and flow metering. The kerosene collected from the top collection port of the centrifugal rotating bed 7 is condensed and enters the reflux tank 9.

[0063] The mixture of tributyl phosphate / kerosene and kerosene were collected in the gas phase from the higher collection port, while the heavier nuclide-metal complex was collected in the liquid phase from the lower collection port.

[0064] In one embodiment, a portion of the kerosene entering the return tank 9 is returned to the high-gravity rotating bed 7 via flow control, while the remaining kerosene is fed into the kerosene product tank 13 for storage.

[0065] By continuously refluxing the liquid from the reflux tank 9 into the high-gravity rotating bed 7, the refluxed liquid undergoes multiple mass transfers with the rising steam, which can improve the purity of the kerosene.

[0066] In one embodiment, when the liquid sampling result in the reflux tank 9 meets the requirement that the TBP content is ≤0.02% vol, the reflux ratio is set to 0.2-6 (such as 2.5, 3, 4, etc.), so that the corresponding part of the kerosene is returned to the high gravity rotating bed 7 as reflux, and the remaining part of the kerosene is collected to the kerosene product tank 13.

[0067] The higher the purity of the kerosene collected in the reflux tank 9, the better. In this application, the kerosene has a higher purity when the content of tributyl phosphate (TBP) in the kerosene is <0.02%. The kerosene is refluxed according to the set reflux ratio, and the remainder is collected.

[0068] In one embodiment, the kerosene condensation temperature is 20°C-60°C (e.g., 30°C, 40°C, 50°C, etc.); and / or, the condensation temperature of the tributyl phosphate / kerosene mixture is 20°C-60°C (e.g., 30°C, 40°C, 50°C, etc.); and / or, the cooling temperature of the nuclide metal complex is 20°C-60°C (e.g., 30°C, 40°C, 50°C, etc.).

[0069] Kerosene and tributyl phosphate / kerosene become liquid after condensation, making them easy to collect. Nuclide-metal complexes are suitable for collection after cooling.

[0070] In one embodiment, the rotating bed 7 and the rotating bed reboiler 4 are interconnected. The waste organic liquid entering the rotating bed reboiler 4 from the rotating bed 7 is partially vaporized after being heated in the rotating bed reboiler 4 to form a vaporized phase. The vaporized phase enters the rotating bed 7 from the rotating bed reboiler 4 to provide heat for vapor-liquid mass and heat transfer. The unvaporized liquid after being heated in the rotating bed reboiler 4 is a nuclide-metal complex, which is collected after cooling.

[0071] The heating temperature of the rotating bed reboiler 4 is 110℃-150℃ (e.g., 120℃, 130℃, 140℃, etc.). The rotating bed reboiler 4 can provide heat for vapor-liquid mass and heat transfer to the rotating bed 7.

[0072] In one embodiment, a preheater 3 is used to preheat the radioactive waste organic phase, and the preheated radioactive waste organic phase is input into a high-gravity rotating bed 7 for treatment. The temperature of the preheater 3 is 60℃-120℃ (e.g., 80℃, 100℃, 110℃, etc.); the motor speed of the high-gravity rotating bed 7 is 100r / min-2000r / min (e.g., 800r / min, 1000r / min, 1500r / min, etc.); and a vacuum pump unit 15 is used to generate vacuum pressure during the treatment of the radioactive waste organic phase, and the pressure is controlled at 200Pa-2000Pa (e.g., 300Pa, 500Pa, 1000Pa, etc.).

[0073] Preheater 3 provides heat to preheat the radioactive waste organic phase, which can reduce the heat consumption of the high-gravity rotating bed reboiler 4; negative pressure distillation can lower the boiling point of the material and make the liquid evaporate quickly.

[0074] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for treating the organic phase of radioactive waste, characterized in that, include: Waste organic phase liquid is added to the supergravity rotating bed (7), and heat is transferred into the supergravity rotating bed (7). Under the supergravity generated by the rotation of the supergravity rotating bed (7), the vapor and liquid are fully transferred to mass and heat, and the nuclide metal complex, the tributyl phosphate / kerosene mixture and kerosene are separated. The nuclide-metal complexes separated and collected from the bottom collection port of the supergravity rotating bed (7) are collected into the recombination tank (6) after cooling and metering. The mixture of tributyl phosphate and kerosene collected from the middle and upper collection port of the supergravity rotating bed (7) is collected into the tributyl phosphate / kerosene product tank (13) after condensation and flow metering. The kerosene collected from the top collection port of the supergravity rotating bed (7) is condensed and enters the reflux tank (9). A portion of the kerosene that enters the return tank (9) is returned to the high gravity rotating bed (7) through flow control, while the remaining kerosene is fed into the kerosene product tank (13) for storage. The supergravity rotating bed (7) is connected to the supergravity rotating bed reboiler (4). The waste organic phase liquid entering the supergravity rotating bed reboiler (4) from the supergravity rotating bed (7) is partially vaporized after being heated by the supergravity rotating bed reboiler (4) to form a vaporized phase. The vaporized phase enters the supergravity rotating bed (7) from the supergravity rotating bed reboiler (4) to provide heat for vapor-liquid mass transfer and heat transfer. The unvaporized liquid after heating in the supergravity rotating bed reboiler (4) is a nuclide-metal complex. The nuclide-metal complex is collected after cooling. The heating temperature of the supergravity rotating bed reboiler (4) is 110℃-150℃.

2. The method for treating radioactive waste organic phase according to claim 1, characterized in that, When the liquid sampling result in the reflux tank (9) meets the requirement that the tributyl phosphate content is ≤0.02%vol, the reflux ratio is set to 0.2-6, so that the corresponding part of the kerosene is returned to the supergravity rotating bed (7) as reflux, and the remaining part of the kerosene is collected to the kerosene product tank (13).

3. The method for treating radioactive waste organic phase according to claim 2, characterized in that, Kerosene condensation temperature: 20℃-60℃; And / or, the condensation temperature of the tributyl phosphate / kerosene mixture is 20℃-60℃; And / or, the cooling temperature of the nuclide-metal complex is 20℃-60℃.

4. The method for treating radioactive waste organic phase according to claim 1, characterized in that, The radioactive waste organic phase is preheated by a preheater (3), and the preheated radioactive waste organic phase is fed into the supergravity rotating bed (7) for treatment. The temperature of the preheater (3) is 60℃-120℃. And / or, the motor speed of the supergravity rotating bed (7) is 100 r / min-2000 r / min; And / or, a vacuum pressure is generated during the treatment of radioactive waste organic phase by means of a vacuum pump unit (15), and the pressure is controlled at 200Pa-2000Pa.

5. An apparatus for treating the organic phase of radioactive waste, applied to the method for treating the organic phase of radioactive waste as described in claim 1, characterized in that, include: The rotating bed (7) that supplies heat, the heavy component tank (6) connected to the bottom collection port of the rotating bed (7), the tributyl phosphate / kerosene product tank (13) connected to the middle and upper collection port of the rotating bed (7), the reflux tank (9) connected to the top collection port of the rotating bed (7), the reflux pump (10) connected to the reflux tank (9), and the kerosene product tank (13) connected to the reflux pump (10), wherein the reflux pump (10) is also connected to the rotating bed (7).

6. The apparatus for treating radioactive waste organic phase according to claim 5, characterized in that, The device for treating radioactive waste organic phase also includes a supergravity rotating bed reboiler (4) connected to the supergravity rotating bed (7). The recombinant tank (6) is connected to the bottom collection port of the supergravity rotating bed (7) through the supergravity rotating bed reboiler (4). The supergravity rotating bed reboiler (4) is used to provide heat for vapor-liquid mass transfer and heat transfer to the supergravity rotating bed (7).

7. The apparatus for treating radioactive waste organic phase according to claim 6, characterized in that, The device for treating radioactive waste organic phase also includes a waste organic phase tank (1), a feed metering pump (2) and a preheater (3) connected in sequence, and the preheater (3) is also connected to the high gravity rotating bed (7). And / or, the bottom of the supergravity rotating bed reboiler (4) is connected to the heavy component tank (6) via a heavy component cooler (5).

8. The apparatus for treating the organic phase of radioactive waste according to claim 5, characterized in that, The upper collection port of the supergravity rotating bed (7) is connected to the tributyl phosphate / kerosene product tank (13) via a tributyl phosphate / kerosene condenser (8). And / or, the top collection port of the supergravity rotating bed (7) is connected to the reflux tank (9) via a kerosene condenser (8), which is connected to a negative pressure generating assembly for providing a negative pressure environment for the device, wherein the negative pressure generating assembly includes a vacuum pump buffer tank (14) and a vacuum pump unit (15), and the kerosene condenser (8), the vacuum pump buffer tank (14) and the vacuum pump unit (15) are connected in sequence; And / or, the supergravity rotating bed (7) is selected from at least one of the multi-layer baffle rotating bed and the multi-layer rotating packing bed.

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