Artificial radionuclide adsorption system

Abstract

The utility model provides an artificial radionuclide adsorption system, and belongs to the technical field of radionuclide separation. According to the utility model, the artificial radionuclide stock solution is firstly conveyed to the primary filter through the pulse pump, and is primarily filtered through a multi-layer structure in the primary filter, so that the problems of blockage or excessive loss of an adsorption layer and the like when radionuclides are directly separated are avoided; the filtrate obtained after preliminary filtration is introduced into an evaporator to be evaporated and then introduced into a carbon-14 adsorption fixed bed, carbon-14 is separated in a reaction chamber in the carbon-14 adsorption fixed bed through the method that carbon-14 reacts with oxygen and then is adsorbed through a catalytic bed, the method is simple and efficient, meanwhile, the carbon-14 is adsorbed through an adsorption layer, and the separation efficiency is improved. The used adsorption layer is convenient to replace after failure, the desorption process is simple, and high-temperature or other complex treatment processes are not needed again.

Description

Technical Field

[0001] The utility model relates to the technical field of radioactive nuclide separation, and particularly relates to an artificial radioactive nuclide adsorption system. Background Technique

[0002] The treatment and management of radioactive nuclides are important links in the development and application of nuclear energy. As an effective treatment method, the adsorption method has the advantages of simple operation, strong pertinence, wide material sources, etc., and is widely used in the treatment of radioactive nuclides. Radioactive nuclide adsorption refers to the transfer of radioactive nuclides from the liquid phase or gas phase to the surface of solid substances.

[0003] CN209246097U discloses a waste treatment device containing organic tritium carbon-14, which includes a gas supply system, a first-stage high-temperature combustion furnace, a second-stage high-temperature catalytic furnace, a water vapor separation device, and a CO 2 absorption tower. The gas supply system, the first-stage high-temperature combustion furnace, the second-stage high-temperature catalytic furnace, the water vapor separation device, and the CO 2 absorption tower are connected in sequence. In this technical solution, it is necessary to burn through a high-temperature combustion furnace and then catalyze through a high-temperature catalytic furnace to remove organic tritium carbon-14, which is relatively dangerous and has high energy consumption.

[0004] CN111879793A discloses a tritium gas adsorption performance experimental device and method for measuring the tritium gas adsorption performance of a sample to be tested. The device includes a test chamber (1) with a sealed space inside and several interfaces on the box body, and a dry air input device (2), a standard tritium gas input device (3), a vacuum pump (4), a circulation pump (5), an ionization chamber (6), a first ethylene glycol bubbler (7), a temperature and humidity meter (9), and a pressure gauge (10) detachably arranged on the test chamber (1) through the interfaces. The present invention integrates the sample tritium adsorption device and the measurement device, so that the adsorption of tritium by the sample to be tested reaches equilibrium in the sealed test chamber (1), and the gas in the test chamber (1) after equilibrium is directly measured. In this technical solution, the accuracy requirements for the equipment are relatively high, and the adsorption capacity is single.

[0005] CN114307651A discloses a device and method for separating colloids adsorbed with radionuclides of different particle sizes, belonging to the technical field of radioactive colloid separation. The device includes a colloidal solution bottle and a silica gel tube. The colloidal solution bottle contains colloidal solutions of different particle sizes adsorbed with radionuclides. One end of the silica gel tube is inserted into the colloidal solution, passes through the rollers of a peristaltic pump, and the other end of the silica gel tube is connected to the feed port of an ultrafiltration membrane separation module for separating colloids of different particle sizes. The discharge port of the ultrafiltration membrane separation module is connected to a tail liquid collection bottle through a silica gel tube. In this technical solution, colloids in water need to be separated by membranes of different particle sizes to adsorb radionuclides of different particle sizes. Since the required membrane has a high precision, the cost of the membrane is also relatively high, and there are limitations for colloids of radionuclides with different particle sizes that can be separated, and different nuclides with similar particle sizes cannot be separated.

[0006] In summary, the separation process of radionuclides has a high degree of fineness, requires high standards for operators or separation materials, and the cost of materials is relatively high. At the same time, the separation form is relatively single and dangerous, which is still an urgent problem to be solved. Utility Model Content

[0007] In view of the above problems, the present utility model proposes an artificial radionuclide adsorption system. By setting different adsorption fixed beds, different radionuclides are separated, improving the separation effect of radionuclides. At the same time, specific nuclides can be separated, and the subsequent desorption process is also simple to operate, without the need to separate different radionuclides again.

[0008] The present utility model provides an artificial radionuclide adsorption system, characterized in that, according to the flow direction of the artificial radionuclide stock solution, the system successively includes a stock solution unit, a primary filtration unit, a fine filtration unit, a detection unit, and a recovery unit;

[0009] The stock solution unit includes a stock solution tank and a pulse pump;

[0010] The primary filtration unit includes a primary filter;

[0011] The fine filtration unit includes an evaporator, a carbon-14 adsorption fixed bed, a compressor, a tritium adsorption fixed bed, and a uranium dioxide ion adsorption fixed bed;

[0012] The detection unit includes a nuclide identifier;

[0013] The recovery unit includes a recovery tank.

[0014] Furthermore, a silica gel tube is connected between the stock solution tank and the primary filter, and a flow control valve is installed on the silica gel tube.

[0015] Furthermore, the stock solution tank is connected to the pulse pump through a silica gel tube.

[0016] Further, the pulse pump is connected to the liquid inlet of the primary filter through a silica gel tube.

[0017] Further, the liquid inlet of the primary filter is arranged at its bottom, and the liquid outlet of the primary filter is arranged at the top.

[0018] The primary filter is of a straight cylinder type. Inside the primary filter, from bottom to top, there are respectively arranged a fine sand layer, a first filter cotton layer, an activated carbon layer, a second filter cotton layer and an ion resin layer, and the fine sand layer, the first filter cotton layer, the activated carbon layer, the second filter cotton layer and the ion resin layer fill the inside of the primary filter.

[0019] Further, the liquid outlet at the top of the primary filter is connected to the liquid inlet of the evaporator through a silica gel tube.

[0020] Further, the steam outlet of the evaporator is connected to the steam inlet of the carbon-14 adsorption fixed bed through a silica gel tube.

[0021] Further, the steam inlet of the carbon-14 adsorption fixed bed is arranged at its bottom, the steam outlet of the carbon-14 adsorption fixed bed is arranged at the top, and an oxygen inlet is also arranged at the bottom of the carbon-14 adsorption fixed bed.

[0022] The carbon-14 adsorption fixed bed is of a straight cylinder type. The carbon-14 adsorption fixed bed is equally divided into three parts according to its height. From bottom to top, they are respectively a reaction chamber, a catalytic bed and a gas collection chamber, and the reaction chamber, the catalytic bed and the gas collection chamber are separated by breathable partition plates respectively.

[0023] Further, the catalytic bed in the carbon-14 adsorption fixed bed is filled with carbon-14 catalytic materials.

[0024] Further, the steam outlet at the top of the carbon-14 adsorption fixed bed is connected to the air inlet of the compressor through a silica gel tube, and the liquid outlet of the compressor is connected to the liquid inlet of the tritium adsorption fixed bed.

[0025] Further, the liquid inlet of the tritium adsorption fixed bed is arranged at the top of the tritium adsorption fixed bed, and the bottom of the tritium adsorption fixed bed is the liquid outlet.

[0026] The tritium adsorption fixed bed is of a straight cylinder type. The inside of the tritium adsorption fixed bed is filled with a tritium adsorption layer, and the tritium adsorption layer fills the inside of the tritium adsorption fixed bed.

[0027] Further, baffles are equidistantly and alternately installed on both sides of the inner wall of the tritium adsorption fixed bed. The baffle includes a fixed side and a movable side. The fixed side of the baffle is welded to the inner wall of the tritium adsorption fixed bed, and the movable side of the baffle is suspended in the tritium adsorption fixed bed. The number of the baffles is 5 - 8;

[0028] The height of the movable side of the baffle in the tritium adsorption fixed bed is lower than that of the fixed side. The baffle is in a downward - inclined structure. The included angle between the upper surface of the baffle and the horizontal is 0 - 30°, and the ratio of the length of the baffle to the inner diameter of the tritium adsorption fixed bed is 4:5.

[0029] Further, the liquid outlet of the tritium adsorption fixed bed is connected to the liquid inlet of the uranium dioxide ion adsorption fixed bed through a silica gel tube.

[0030] Further, the liquid inlet of the uranium dioxide ion adsorption fixed bed is arranged at the top of the uranium dioxide ion adsorption fixed bed, and the bottom of the uranium dioxide ion adsorption fixed bed is the liquid outlet;

[0031] The uranium dioxide ion adsorption fixed bed is of a straight - tube type, and the inside of the uranium dioxide ion adsorption fixed bed is filled with a uranium dioxide ion adsorption layer, and the uranium dioxide ion adsorption layer fills the inside of the uranium dioxide ion adsorption fixed bed.

[0032] Further, baffles are equidistantly and alternately installed on both sides of the inner wall of the uranium dioxide ion adsorption fixed bed. The baffle includes a fixed side and a movable side. The fixed side of the baffle is welded to the inner wall of the uranium dioxide ion adsorption fixed bed, and the movable side of the baffle is suspended in the uranium dioxide ion adsorption fixed bed. The number of the baffles is 5 - 8;

[0033] The height of the movable side of the baffle in the uranium dioxide ion adsorption fixed bed is lower than that of the fixed side. The baffle is in a downward - inclined structure. The included angle between the upper surface of the baffle and the horizontal is 0 - 30°, and the ratio of the length of the baffle to the inner diameter of the uranium dioxide ion adsorption fixed bed is 4:5.

[0034] Further, the liquid outlet of the uranium dioxide ion adsorption fixed bed is connected to the liquid inlet of the nuclide identifier through a silica gel tube and is also connected to the liquid inlet of the recovery tank.

[0035] Further, the thickness ratio of the fine sand layer, the first filter cotton layer, the activated carbon layer, the second filter cotton layer and the ion resin layer is 1:1:1:1:2.

[0036] The beneficial effects of the present utility model:

[0037] 1. In the present utility model, first, the artificial radioactive nuclide stock solution is transported by a pulse pump and sent to a primary filter. Preliminary filtration is carried out through the multi-layer structure in the primary filter, avoiding problems such as blockage or excessive loss of the adsorption layer during the direct separation of radioactive nuclides. The filtrate after preliminary filtration is evaporated in an evaporator and then sent to a carbon-14 adsorption and fixation bed. In the reaction chamber of the carbon-14 adsorption and fixation bed, carbon-14 is separated by reacting with oxygen and then adsorbed through a catalytic bed. This method is simple and efficient, and the operation during the separation process is simple without any danger.

[0038] 2. After the separation of carbon-14 from the artificial radioactive nuclide stock solution in the present utility model, it is compressed by a compressor. The temperature of the compressed filtrate is relatively high, and then it passes through the tritium adsorption and fixation bed and the uranium dioxide ion adsorption and fixation bed in a timely manner. The adsorption separation is carried out by utilizing the self-gravity of the filtrate, improving the adsorption efficiency of the tritium adsorption and fixation bed and the uranium dioxide ion adsorption and fixation bed. There is no need to use a preheater to preheat the filtrate. In the present utility model, baffle plates are provided in both the tritium adsorption and fixation bed and the uranium dioxide ion adsorption and fixation bed, increasing the contact time between the filtrate and the tritium adsorption layer and the uranium dioxide ion adsorption layer, and improving the separation efficiency of tritium and uranium dioxide ions.

[0039] 3. During the separation process in the present utility model, an adsorption layer is used for adsorption. The used adsorption layer is convenient to replace after it fails, and the desorption process is simple without the need to go through high temperature or other complex treatment processes again. Finally, the content of radioactive nuclides in the filtrate is detected by a nuclide identifier, and then recovered by a recovery tank. The overall separation process is simple, convenient, and efficient. The adsorption layer is also convenient to replace during use, ensuring the continuity of the separation process and having a wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of the artificial radioactive nuclide adsorption system in the present utility model;

[0041] Figure 2 is a schematic structural diagram of the primary filter in the present utility model;

[0042] Figure 3 is a schematic structural diagram of the carbon-14 adsorption and fixation bed in the present utility model;

[0043] The names of the reference numerals in the figure are as follows: 1, stock solution tank; 2, pulse pump; 3, primary filter; 4, evaporator; 5, carbon-14 adsorption fixed bed; 6, compressor; 7, tritium adsorption fixed bed; 8, uranium dioxide ion adsorption fixed bed; 9, nuclide identifier; 10, recovery tank; 11, flow control valve; 31, fine sand layer; 32, first filter cotton layer; 33, activated carbon layer; 34, second filter cotton layer; 35, ion resin layer; 51, reaction chamber; 52, catalytic bed; 53, gas collection chamber. Specific Embodiment

[0044] The following describes the invention in detail with reference to embodiments:

[0045] The present utility model provides an artificial radionuclide adsorption system with high adsorption efficiency for carbon-14, tritium and uranium dioxide ions in the system, and greatly reduces the energy consumption during the adsorption process.

[0046] Embodiment 1

[0047] This embodiment provides an artificial radionuclide adsorption system. According to the flow direction of the artificial radionuclide stock solution, the system sequentially includes a stock solution unit, a primary filtration unit, a fine filtration unit, a detection unit and a recovery unit;

[0048] The stock solution unit includes a stock solution tank 1 and a pulse pump 2;

[0049] The primary filtration unit includes a primary filter 3;

[0050] The fine filtration unit includes an evaporator 4, a carbon-14 adsorption fixed bed 5, a compressor 6, a tritium adsorption fixed bed 7 and a uranium dioxide ion adsorption fixed bed 8;

[0051] The detection unit includes a nuclide identifier 9;

[0052] The recovery unit includes a recovery tank 10.

[0053] In this embodiment, a silica gel tube is connected between the stock solution tank 1 and the primary filter 3, and a flow control valve 11 is installed on the silica gel tube. The stock solution tank 1 is connected to the pulse pump 2 through a silica gel tube, and the pulse pump 2 is connected to the liquid inlet of the primary filter 3 through a silica gel tube;

[0054] The liquid inlet of the primary filter 3 is arranged at the bottom thereof, and the liquid outlet of the primary filter 3 is arranged at the top; the primary filter 3 is of a straight cylinder type. Inside the primary filter 3, from bottom to top, there are also arranged a fine sand layer 31, a first filter cotton layer 32, an activated carbon layer 33, a second filter cotton layer 34 and an ion resin layer 35, wherein the fine sand layer 31, the first filter cotton layer 32, the activated carbon layer 33, the second filter cotton layer 34 and the ion resin layer 35 fill the inside of the primary filter 3;

[0055] The liquid outlet at the top of the primary filter 3 is connected to the liquid inlet of the evaporator 4 through a silica gel tube; the steam outlet of the evaporator 4 is connected to the steam inlet of the carbon-14 adsorption and fixation bed 5 through a silica gel tube. The steam inlet of the carbon-14 adsorption and fixation bed 5 is arranged at its bottom, and the steam outlet of the carbon-14 adsorption and fixation bed 5 is arranged at the top. An oxygen inlet is also arranged at the bottom of the carbon-14 adsorption and fixation bed 5;

[0056] The carbon-14 adsorption and fixation bed 5 is of a straight cylinder type. The carbon-14 adsorption and fixation bed 5 is equally divided into three parts according to the height of the carbon-14 adsorption and fixation bed 5. From bottom to top, they are a reaction chamber 51, a catalytic bed 52, and a gas collection chamber 53 respectively. The reaction chamber 51, the catalytic bed 52, and the gas collection chamber 53 are separated by breathable partitions respectively. The catalytic bed in the carbon-14 adsorption and fixation bed 5 is filled with carbon-14 catalytic materials;

[0057] The steam outlet at the top of the carbon-14 adsorption and fixation bed 5 is connected to the air inlet of the compressor 6 through a silica gel tube. The liquid outlet of the compressor 6 is connected to the liquid inlet of the tritium adsorption and fixation bed 7. The liquid inlet of the tritium adsorption and fixation bed 7 is arranged at the top of the tritium adsorption and fixation bed 7, and the bottom of the tritium adsorption and fixation bed 7 is the liquid outlet;

[0058] The tritium adsorption and fixation bed 7 is of a straight cylinder type. The inside of the tritium adsorption and fixation bed 7 is filled with a tritium adsorption layer, and the tritium adsorption layer fills the inside of the tritium adsorption and fixation bed 7; Baffle plates are also equidistantly and alternately installed on both sides of the inner wall of the tritium adsorption and fixation bed 7. The baffle plates include a fixed side and a movable side. The fixed side of the baffle plate is welded to the inner wall of the tritium adsorption and fixation bed 7, and the movable side of the baffle plate is suspended inside the tritium adsorption and fixation bed 7. The number of baffle plates is 5;

[0059] The height of the movable side of the baffle plate in the tritium adsorption and fixation bed 7 is lower than that of the fixed side. The baffle plate is in a downward inclined structure. The included angle between the upper surface of the baffle plate and the horizontal is 25°. The ratio of the length of the baffle plate to the inner diameter of the tritium adsorption and fixation bed 7 is 4:5;

[0060] The liquid outlet of the tritium adsorption and fixation bed 7 is connected to the liquid inlet of the uranium dioxide ion adsorption and fixation bed 8 through a silica gel tube. The liquid inlet of the uranium dioxide ion adsorption and fixation bed 8 is arranged at the top of the uranium dioxide ion adsorption and fixation bed 8, and the bottom of the uranium dioxide ion adsorption and fixation bed 8 is the liquid outlet;

[0061] The uranium dioxide ion adsorption fixed bed 8 is of a straight cylinder type, and the interior of the uranium dioxide ion adsorption fixed bed 8 is filled with a uranium dioxide ion adsorption layer, where the uranium dioxide ion adsorption layer fills the interior of the uranium dioxide ion adsorption fixed bed 8; on both sides of the inner wall of the uranium dioxide ion adsorption fixed bed 8, baffle plates are alternately installed at equal intervals. The baffle plates include a fixed side and a movable side. The fixed side of the baffle plate is welded to the inner wall of the uranium dioxide ion adsorption fixed bed 8, and the movable side of the baffle plate is suspended inside the uranium dioxide ion adsorption fixed bed 8. The number of baffle plates is 5;

[0062] The height of the movable side of the baffle plate in the uranium dioxide ion adsorption fixed bed 8 is lower than that of the fixed side. The baffle plate is in a downward inclined structure. The included angle between the upper surface of the baffle plate and the horizontal is 25°. The ratio of the length of the baffle plate to the inner diameter of the uranium dioxide ion adsorption fixed bed 8 is 4:5;

[0063] The liquid outlet of the uranium dioxide ion adsorption fixed bed 8 is connected to the liquid inlet of the nuclide identifier 9 through a silica gel tube and is also connected to the liquid inlet of the recovery tank 10.

[0064] Furthermore, the thickness ratio of the fine sand layer 31, the first filter cotton layer 32, the activated carbon layer 33, the second filter cotton layer 34, and the ion resin layer 35 is 1:1:1:1:2.

[0065] In this embodiment, the removal rate of carbon-14 in the stock solution tank 1 is 98.1%, the removal rate of tritium is 99.6%, and the removal rate of uranium dioxide ions is 98.9%.

[0066] Embodiment 2

[0067] This embodiment provides an artificial radionuclide adsorption system. According to the flow direction of the artificial radionuclide stock solution, the system sequentially includes a stock solution unit, a primary filtration unit, a fine filtration unit, a detection unit, and a recovery unit;

[0068] The stock solution unit includes a stock solution tank 1 and a pulse pump 2;

[0069] The primary filtration unit includes a primary filter 3;

[0070] The fine filtration unit includes an evaporator 4, a carbon-14 adsorption fixed bed 5, a compressor 6, a tritium adsorption fixed bed 7, and a uranium dioxide ion adsorption fixed bed 8;

[0071] The detection unit includes a nuclide identifier 9;

[0072] The recovery unit includes a recovery tank 10.

[0073] In this embodiment, a silica gel tube is connected between the stock solution tank 1 and the primary filter 3, and a flow regulating valve 11 is installed on the silica gel tube. The stock solution tank 1 is connected to the pulse pump 2 through a silica gel tube, and the pulse pump 2 is connected to the liquid inlet of the primary filter 3 through a silica gel tube;

[0074] The liquid inlet of the primary filter 3 is arranged at its bottom, and the liquid outlet of the primary filter 3 is arranged at the top. The primary filter 3 is of a straight cylinder type. Inside the primary filter 3, from bottom to top, there are also arranged a fine sand layer 31, a first filter cotton layer 32, an activated carbon layer 33, a second filter cotton layer 34 and an ion resin layer 35 respectively, wherein the fine sand layer 31, the first filter cotton layer 32, the activated carbon layer 33, the second filter cotton layer 34 and the ion resin layer 35 fill the inside of the primary filter 3;

[0075] The liquid outlet at the top of the primary filter 3 is connected to the liquid inlet of the evaporator 4 through a silica gel tube. The steam outlet of the evaporator 4 is connected to the steam inlet of the carbon-14 adsorption fixed bed 5 through a silica gel tube. The steam inlet of the carbon-14 adsorption fixed bed 5 is arranged at its bottom, and the steam outlet of the carbon-14 adsorption fixed bed 5 is arranged at the top. An oxygen inlet is also arranged at the bottom of the carbon-14 adsorption fixed bed 5;

[0076] The carbon-14 adsorption fixed bed 5 is of a straight cylinder type. The carbon-14 adsorption fixed bed 5 is equally divided into three parts according to the height of the carbon-14 adsorption fixed bed 5. From bottom to top, they are a reaction chamber 51, a catalytic bed 52 and a gas collection chamber 53 respectively. The reaction chamber 51, the catalytic bed 52 and the gas collection chamber 53 are separated by breathable partition plates respectively. The catalytic bed in the carbon-14 adsorption fixed bed 5 is filled with carbon-14 catalytic materials;

[0077] The steam outlet at the top of the carbon-14 adsorption fixed bed 5 is connected to the air inlet of the compressor 6 through a silica gel tube. The liquid outlet of the compressor 6 is connected to the liquid inlet of the tritium adsorption fixed bed 7. The liquid inlet of the tritium adsorption fixed bed 7 is arranged at the top of the tritium adsorption fixed bed 7, and the bottom of the tritium adsorption fixed bed 7 is the liquid outlet;

[0078] The tritium adsorption fixed bed 7 is of a straight cylinder type. The inside of the tritium adsorption fixed bed 7 is filled with a tritium adsorption layer, and the tritium adsorption layer fills the inside of the tritium adsorption fixed bed 7. Baffle plates are also equidistantly and alternately installed on both sides of the inner wall of the tritium adsorption fixed bed 7. The baffle plates include a fixed side and a movable side. The fixed side of the baffle plate is welded to the inner wall of the tritium adsorption fixed bed 7, and the movable side of the baffle plate is suspended inside the tritium adsorption fixed bed 7. The number of the baffle plates is 5;

[0079] The height of the movable side of the baffle plate in the tritium adsorption fixed bed 7 is lower than that of the fixed side. The baffle plate is in a downward-sloping structure. The angle between the upper surface of the baffle plate and the horizontal is 25°. The ratio of the length of the baffle plate to the inner diameter of the tritium adsorption fixed bed 7 is 4:5.

[0080] The liquid outlet of the tritium adsorption fixed bed 7 is connected to the liquid inlet of the uranium dioxide ion adsorption fixed bed 8 through a silica gel tube. The liquid inlet of the uranium dioxide ion adsorption fixed bed 8 is arranged at the top of the uranium dioxide ion adsorption fixed bed 8, and the bottom of the uranium dioxide ion adsorption fixed bed 8 is the liquid outlet.

[0081] The uranium dioxide ion adsorption fixed bed 8 is of a straight cylinder type. The inside of the uranium dioxide ion adsorption fixed bed 8 is filled with a uranium dioxide ion adsorption layer, and the uranium dioxide ion adsorption layer fills the inside of the uranium dioxide ion adsorption fixed bed 8. On both sides of the inner wall of the uranium dioxide ion adsorption fixed bed 8, baffle plates are alternately installed at equal distances. The baffle plate includes a fixed side and a movable side. The fixed side of the baffle plate is welded to the inner wall of the uranium dioxide ion adsorption fixed bed 8, and the movable side of the baffle plate is suspended inside the uranium dioxide ion adsorption fixed bed 8. The number of baffle plates is 5.

[0082] The height of the movable side of the baffle plate in the uranium dioxide ion adsorption fixed bed 8 is lower than that of the fixed side. The baffle plate is in a downward-sloping structure. The angle between the upper surface of the baffle plate and the horizontal is 25°. The ratio of the length of the baffle plate to the inner diameter of the uranium dioxide ion adsorption fixed bed 8 is 4:5.

[0083] The liquid outlet of the uranium dioxide ion adsorption fixed bed 8 is connected to the liquid inlet of the radionuclide identifier 9 through a silica gel tube and is also connected to the liquid inlet of the recovery tank 10.

[0084] Furthermore, the thickness ratio of the fine sand layer 31, the first filter cotton layer 32, the activated carbon layer 33, the second filter cotton layer 34, and the ion resin layer 35 is 1:1:1:1:2.

[0085] In this embodiment, the removal rate of carbon-14 in the stock solution tank 1 is 99.0%, the removal rate of tritium is 98.3%, and the removal rate of uranium dioxide ions is 98.5%.

[0086] Example 3

[0087] This embodiment provides an artificial radionuclide adsorption and catalysis system. According to the flow direction of the artificial radionuclide stock solution, the system sequentially includes a stock solution unit, a primary filtration unit, a fine filtration unit, a detection unit, and a recovery unit.

[0088] The stock solution unit includes a stock solution tank 1 and a pulse pump 2.

[0089] The primary filtration unit includes a primary filter 3;

[0090] The fine filtration unit includes an evaporator 4, a carbon-14 adsorption fixed bed 5, a compressor 6, a tritium adsorption fixed bed 7, and a uranium dioxide ion adsorption fixed bed 8;

[0091] The detection unit includes a nuclide identifier 9;

[0092] The recovery unit includes a recovery tank 10.

[0093] In this embodiment, a silica gel tube is connected between the stock solution tank 1 and the primary filter 3, and a flow regulating valve 11 is installed on the silica gel tube. The stock solution tank 1 is connected to the pulse pump 2 through a silica gel tube, and the pulse pump 2 is connected to the liquid inlet of the primary filter 3 through a silica gel tube;

[0094] The liquid inlet of the primary filter 3 is arranged at its bottom, and the liquid outlet of the primary filter 3 is arranged at the top. The primary filter 3 is of a straight cylinder type. Inside the primary filter 3, from bottom to top, there are also arranged a fine sand layer 31, a first filter cotton layer 32, an activated carbon layer 33, a second filter cotton layer 34, and an ion resin layer 35. The fine sand layer 31, the first filter cotton layer 32, the activated carbon layer 33, the second filter cotton layer 34, and the ion resin layer 35 fill the inside of the primary filter 3;

[0095] The liquid outlet at the top of the primary filter 3 is connected to the liquid inlet of the evaporator 4 through a silica gel tube. The steam outlet of the evaporator 4 is connected to the steam inlet of the carbon-14 adsorption fixed bed 5 through a silica gel tube. The steam inlet of the carbon-14 adsorption fixed bed 5 is arranged at its bottom, and the steam outlet of the carbon-14 adsorption fixed bed 5 is arranged at the top. An oxygen inlet is also arranged at the bottom of the carbon-14 adsorption fixed bed 5;

[0096] The carbon-14 adsorption fixed bed 5 is of a straight cylinder type. The carbon-14 adsorption fixed bed 5 is equally divided into three parts according to its height. From bottom to top, they are a reaction chamber 51, a catalytic bed 52, and a gas collection chamber 53 respectively. The reaction chamber 51, the catalytic bed 52, and the gas collection chamber 53 are separated by breathable partitions respectively. The catalytic bed in the carbon-14 adsorption fixed bed 5 is filled with carbon-14 catalytic materials;

[0097] The steam outlet at the top of the carbon-14 adsorption fixed bed 5 is connected to the air inlet of the compressor 6 through a silica gel tube. The liquid outlet of the compressor 6 is connected to the liquid inlet of the tritium adsorption fixed bed 7. The liquid inlet of the tritium adsorption fixed bed 7 is arranged at the top of the tritium adsorption fixed bed 7, and the bottom of the tritium adsorption fixed bed 7 is the liquid outlet;

[0098] The tritium adsorption fixed bed 7 is of a straight cylinder type, and the inside of the tritium adsorption fixed bed 7 is filled with a tritium adsorption layer, where the tritium adsorption layer fills the inside of the tritium adsorption fixed bed 7; on both sides of the inner wall of the tritium adsorption fixed bed 7, baffle plates are alternately installed at equal intervals. The baffle plates include a fixed side and a movable side. The fixed side of the baffle plate is welded to the inner wall of the tritium adsorption fixed bed 7, and the movable side of the baffle plate is suspended inside the tritium adsorption fixed bed 7. The number of the baffle plates is 5;

[0099] The height of the movable side of the baffle plate in the tritium adsorption fixed bed 7 is lower than that of the fixed side. The baffle plate is in a downward inclined structure. The included angle between the upper surface of the baffle plate and the horizontal is 25°. The ratio of the length of the baffle plate to the inner diameter of the tritium adsorption fixed bed 7 is 4:5;

[0100] The liquid outlet of the tritium adsorption fixed bed 7 is connected to the liquid inlet of the uranium dioxide ion adsorption fixed bed 8 through a silica gel tube. The liquid inlet of the uranium dioxide ion adsorption fixed bed 8 is arranged at the top of the uranium dioxide ion adsorption fixed bed 8, and the bottom of the uranium dioxide ion adsorption fixed bed 8 is the liquid outlet;

[0101] The uranium dioxide ion adsorption fixed bed 8 is of a straight cylinder type, and the inside of the uranium dioxide ion adsorption fixed bed 8 is filled with a uranium dioxide ion adsorption layer, where the uranium dioxide ion adsorption layer fills the inside of the uranium dioxide ion adsorption fixed bed 8; on both sides of the inner wall of the uranium dioxide ion adsorption fixed bed 8, baffle plates are alternately installed at equal intervals. The baffle plates include a fixed side and a movable side. The fixed side of the baffle plate is welded to the inner wall of the uranium dioxide ion adsorption fixed bed 8, and the movable side of the baffle plate is suspended inside the uranium dioxide ion adsorption fixed bed 8. The number of the baffle plates is 5;

[0102] The height of the movable side of the baffle plate in the uranium dioxide ion adsorption fixed bed 8 is lower than that of the fixed side. The baffle plate is in a downward inclined structure. The included angle between the upper surface of the baffle plate and the horizontal is 25°. The ratio of the length of the baffle plate to the inner diameter of the uranium dioxide ion adsorption fixed bed 8 is 4:5;

[0103] The liquid outlet of the uranium dioxide ion adsorption fixed bed 8 is connected to the liquid inlet of the nuclide identifier 9 through a silica gel tube and is also connected to the liquid inlet of the recovery tank 10.

[0104] Further, the thickness ratio of the fine sand layer 31, the first filter cotton layer 32, the activated carbon layer 33, the second filter cotton layer 34, and the ion resin layer 35 is 1:1:1:1:2.

[0105] In this embodiment, the removal rate of carbon-14 in the stock solution tank 1 is 98.5%, the removal rate of tritium is 98.1%, and the removal rate of uranium dioxide ions is 98.2%.

[0106] Table 1 shows the removal rates of carbon-14, tritium, and uranium dioxide ions in Examples 1-3 of this embodiment.

[0107]

[0108] From the above, it can be seen that the artificial radionuclide adsorption system described in this patent has a very wide range of applications, low costs, and extremely high market prospects.

[0109] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope claimed by the present invention.

Claims

1. An artificial radionuclide adsorption system, characterized in that: According to the flow direction of the artificial radionuclide stock solution, the system includes a stock solution unit, a primary filtration unit, a fine filtration unit, a detection unit and a recovery unit in sequence; The raw liquid unit comprises a raw liquid tank (1) and a pulse pump (2); The primary filtration unit comprises a primary filter (3); The fine filtration unit comprises an evaporator (4), a carbon-14 adsorption fixed bed (5), a compressor (6), a tritium adsorption fixed bed (7) and a uranium dioxide ion adsorption fixed bed (8); The detection unit comprises a nuclide identifier (9); The recovery unit comprises a recovery tank (10).

2. The artificial radionuclide adsorption system according to claim 1, characterized in that: A silicone tube is connected between the raw liquid tank (1) and the primary filter (3), and a flow regulating valve (11) is installed on the silicone tube.

3. The artificial radionuclide adsorption system according to claim 1, characterized in that: The liquid inlet of the primary filter (3) is arranged at the bottom thereof, and the liquid outlet of the primary filter (3) is arranged at the top; The primary filter (3) is of a straight cylindrical type, and a fine sand layer (31), a first filter cotton layer (32), an activated carbon layer (33), a second filter cotton layer (34) and an ion resin layer (35) are respectively arranged inside the primary filter (3) from bottom to top, wherein the fine sand layer (31), the first filter cotton layer (32), the activated carbon layer (33), the second filter cotton layer (34) and the ion resin layer (35) completely fill the interior of the primary filter (3).

4. The artificial radionuclide adsorption system according to claim 1, characterized in that: The steam inlet of the carbon-14 adsorption fixed bed (5) is arranged at the bottom thereof, the steam outlet of the carbon-14 adsorption fixed bed (5) is arranged at the top, and the bottom of the carbon-14 adsorption fixed bed (5) is also provided with an oxygen inlet; The carbon-14 adsorption fixed bed (5) is of a straight cylindrical type. The carbon-14 adsorption fixed bed (5) is equally divided into three parts according to the height of the carbon-14 adsorption fixed bed (5), which are respectively a reaction chamber (51), a catalyst bed (52) and a gas collecting chamber (53) from bottom to top. The reaction chamber (51), the catalyst bed (52) and the gas collecting chamber (53) are separated by air-permeable partitions.

5. The artificial radionuclide adsorption system according to claim 1, characterized in that: The steam outlet at the top of the carbon-14 adsorption fixed bed (5) is connected to the air inlet of the compressor (6) through a silicone tube, and the liquid outlet of the compressor (6) is connected to the liquid inlet of the tritium adsorption fixed bed (7).

6. The artificial radionuclide adsorption system according to claim 1, characterized in that: The liquid inlet of the tritium adsorption fixed bed (7) is arranged at the top of the tritium adsorption fixed bed (7), and the bottom of the tritium adsorption fixed bed (7) is a liquid outlet; The tritium adsorption fixed bed (7) is of a straight cylindrical type, and the interior of the tritium adsorption fixed bed (7) is filled with a tritium adsorption layer, wherein the tritium adsorption layer completely fills the interior of the tritium adsorption fixed bed (7).

7. The artificial radionuclide adsorption system according to claim 1, characterized in that: Baffles are also alternately installed at equal intervals on both sides of the inner wall of the tritium adsorption fixed bed (7), the baffles comprising a fixed side and a movable side, the fixed side of the baffles being welded to the inner wall of the tritium adsorption fixed bed (7), the movable side of the baffles being suspended in the tritium adsorption fixed bed (7), and the number of the baffles being 5-8; The height of the movable side of the baffle in the tritium adsorption fixed bed (7) is lower than that of the fixed side, the baffle is in a downwardly inclined structure, the angle between the upper surface of the baffle and the horizontal is 0-30°, and the ratio of the length of the baffle to the inner diameter of the tritium adsorption fixed bed (7) is 4:

5.

8. The artificial radionuclide adsorption system according to claim 1, characterized in that: The liquid inlet of the uranium dioxide ion adsorption fixed bed (8) is arranged at the top of the uranium dioxide ion adsorption fixed bed (8), and the bottom of the uranium dioxide ion adsorption fixed bed (8) is a liquid outlet; The uranium dioxide ion adsorption fixed bed (8) is of a straight cylindrical type, and the interior of the uranium dioxide ion adsorption fixed bed (8) is filled with a uranium dioxide ion adsorption layer, wherein the uranium dioxide ion adsorption layer completely fills the interior of the uranium dioxide ion adsorption fixed bed (8).

9. The artificial radionuclide adsorption system according to claim 1, characterized in that: Baffles are also alternately and equidistantly mounted on both sides of the inner wall of the uranium dioxide ion adsorption fixed bed (8), wherein the baffles include a fixed side and a movable side, the fixed side of the baffles being welded to the inner wall of the uranium dioxide ion adsorption fixed bed (8), and the movable side of the baffles being suspended in the uranium dioxide ion adsorption fixed bed (8), and the number of the baffles being 5-8; The height of the movable side of the baffle in the uranium dioxide ion adsorption fixed bed (8) is lower than the fixed side, the baffle is in a downwardly inclined structure, the angle between the upper surface of the baffle and the horizontal is 0-30 degrees, and the ratio of the length of the baffle to the inner diameter of the uranium dioxide ion adsorption fixed bed (8) is 4:

5.

10. The artificial radionuclide adsorption system according to claim 1, characterized in that: The liquid outlet of the uranium dioxide ion adsorption fixed bed (8) is connected to the liquid inlet of the nuclide identification instrument (9) through a silicone tube, and is also connected to the liquid inlet of the recovery tank (10).

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