Preparation equipment for radioactive iodine adsorber

Abstract

The utility model relates to preparation equipment for a radioactive iodine adsorber, and belongs to the technical field of radioactive waste gas treatment. Comprising a circulating pipeline which comprises an air inlet pipeline, an air outlet pipeline and a mounting pipeline, and the two ends of the mounting pipeline are connected to one end of the air inlet pipeline and one end of the air outlet pipeline respectively; the other end of the air inlet pipeline is connected to the air inlet end of the fan, and the other end of the air outlet pipeline is connected to the air outlet end of the fan; the modifier volatilizer is connected to the air outlet pipeline; and the adsorption frame is mounted in the mounting pipeline and is used for supporting an adsorption material. According to the utility model, the problems of high energy consumption, complex process, long period and low efficiency in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to a preparation device for a radioactive iodine adsorber, belonging to the technical field of radioactive waste gas treatment. Background Art

[0002] In nuclear power plants, spent fuel reprocessing plants, and nuclear scientific research experiments, radioactive iodine is a by-product of nuclear fission. Radioactive iodine is harmful to human health and the environment, especially to the human thyroid gland. Therefore, it is necessary to handle radioactive iodine.

[0003] The main components of radioactive iodine are elemental iodine and methyl iodide. The treatment of radioactive gas iodine is mainly through adsorption treatment by activated carbon modified materials with a large specific surface area. In related technologies, radioactive iodine adsorbers are divided into Type I, Type II, and Type III iodine adsorbers. No matter which type of iodine adsorber, the adsorption material used is impregnated coconut shell activated carbon, that is, nuclear activated carbon.

[0004] The modification of activated carbon materials is mainly carried out by impregnating activated carbon with impregnants, which mainly utilizes the physical adsorption of the micropores of activated carbon and the chemical adsorption of the impregnants to treat radioactive iodine.

[0005] After searching, a Chinese patent with publication number CN113070034A discloses an iodine adsorption material and a preparation method thereof, and its technical key points are: comprising the following steps: preparing a treatment liquid: mixing and dispersing water, a modifier and an activator to obtain a treatment liquid; hydrothermal treatment: placing the treatment liquid and activated carbon fiber into a reactor, and keeping the temperature at 60-120°C for 8-20 hours, and increasing the specific surface area of ​​the activated carbon fiber and the adsorption amount of the modifier by hydrothermal treatment; post-treatment: taking out the activated carbon fiber after the hydrothermal treatment, washing, and drying it, and then keeping the dried activated carbon fiber in a protective atmosphere to obtain an iodine adsorption material.

[0006] The preparation method adopted in the above scheme prepares the iodine adsorption material through the steps of impregnation, heat preservation, washing, drying, etc., and a large amount of energy is required in the drying process, especially for activated carbon fibers, which can absorb water several times their own weight, requiring huge energy consumption, and the overall preparation process is complex, long cycle, and low efficiency.

[0007] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a preparation device for a radioactive iodine adsorber, which solves the problems of high energy consumption, complex process, long cycle and low efficiency in the prior art.

[0009] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:

[0010] A preparation device for a radioactive iodine adsorber, comprising:

[0011] The circulation duct comprises an air inlet duct, an air outlet duct and an installation duct, wherein two ends of the installation duct are respectively connected to one end of the air inlet duct and one end of the air outlet duct;

[0012] A fan, wherein the other end of the air inlet duct is connected to the air inlet end of the fan, and the other end of the air outlet duct is connected to the air outlet end of the fan;

[0013] A modifier volatilizer connected to the air outlet duct;

[0014] The adsorption rack is installed inside the installation pipe and is used to support the adsorption material.

[0015] The utility model is further configured as follows: the modifier volatilizer comprises a modifier storage tank, a purge pump connected to the modifier storage tank, and a heater arranged in the modifier storage tank; one end of the modifier storage tank is connected to the air outlet duct.

[0016] The utility model is further configured as follows: a flow meter is provided on the circulation pipeline, and the flow meter is located at the air outlet end of the fan.

[0017] The utility model is further configured as follows: a temperature sensor is provided on the circulation pipeline.

[0018] The utility model is further configured as follows: the adsorption rack includes a plurality of partitions which are stacked and arranged parallel to each other in the installation pipe, the gap between two adjacent partitions extends along the air flow direction, and the adsorption material is S-shaped and passes around the partitions in sequence.

[0019] The utility model is further configured as follows: the installation pipeline is a variable diameter pipeline with small ends and a large middle portion, and flow equalizing plates respectively located on both sides of a plurality of the partitions are arranged in the installation pipeline.

[0020] The utility model is further configured as follows: a plurality of the installation pipes are provided, the plurality of the installation pipes are connected in parallel, and the adsorption racks are all provided in the installation pipes.

[0021] The utility model is further configured as follows: the circulation pipeline is coated with heat-insulating cotton.

[0022] The utility model is further configured as follows: an electric heating wire is arranged on the circulation pipeline.

[0023] The utility model is further configured as follows: the fan is an electric heating fan.

[0024] The beneficial effects of the utility model are:

[0025] 1. By setting a circulation pipeline, a fan, a modifier volatilizer, and an adsorption rack, when the iodine adsorber is prepared, the adsorption material is assembled on the adsorption rack in an S shape, and the assembled adsorption rack is placed in the installation pipeline, and the modifier is injected into the modifier storage tank. At this time, the fan and the purge pump are turned on, and the airflow in the circulation pipeline is circulated by the fan, and the heating temperature of the heater is set, and the modifier in the modifier storage tank is heated to a certain temperature and volatilized, and the volatilized modifier is blown into the circulation pipeline by the purge pump and flows with the airflow in the circulation pipeline. When passing through the adsorption rack, the gaseous modifier is uniformly adsorbed by the adsorption material in the micropores of the activated carbon fiber. After a certain period of attachment, the modification of the adsorption material is completed. The overall preparation process omits the process of impregnation and drying, shortens the preparation cycle, and greatly reduces the energy consumption required for drying. At the same time, through the hot air circulation, the modifier adsorption can be made more uniform, the finished product effect is better, and the process is simple, the preparation cost is reduced, and the efficiency is higher;

[0026] 2. By arranging the adsorption material in an S shape on the adsorption frame, and arranging flow equalizing plates on both sides of the adsorption frame, the modifier can be evenly adsorbed on the adsorption material during the flow process, and the permeability is better and the efficiency is higher;

[0027] 3. By setting an electric heating wire on the circulation pipeline or designing the fan as an electric heating fan, the gaseous modifier can maintain its phase during the circulation process to avoid condensation, making the overall preparation process more stable and efficient.

[0028] 4. By laying out flow meters and temperature sensors on the circulation pipeline, the temperature and flow inside the circulation pipeline can be controlled in real time, and the temperature of the heater, electric heating wire and the air volume of the fan can be adjusted according to the temperature and flow conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the first embodiment.

[0030] Figure 2 yes Figure 1 A partial enlarged view of part A.

[0031] Figure 3 It is a schematic diagram of the overall structure of the second embodiment.

[0032] In the figure: 1. circulation duct; 2. fan; 3. modifier volatilizer; 4. adsorption rack; 5. air inlet duct; 6. air outlet duct; 7. installation duct; 8. thermal insulation cotton; 9. modifier storage tank; 10. purge pump; 11. flow equalizing plate; 12. partition; 13. adsorption material; 14. flow meter; 15. temperature sensor. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific illustrations.

[0034] Embodiment 1

[0035] like Figure 1-Figure 2 As shown, a preparation device for a radioactive iodine adsorber includes a circulation pipeline 1, a fan 2, a modifier volatilizer 3 and an adsorption rack 4, wherein the circulation pipeline 1 includes an air inlet pipeline 5, an air outlet pipeline 6 and an installation pipeline 7, two ends of the installation pipeline 7 are respectively connected to one end of the air inlet pipeline 5 and one end of the air outlet pipeline 6, the other end of the air inlet pipeline 5 is connected to the air inlet end of the fan 2, and the other end of the air outlet pipeline 6 is connected to the air outlet end of the fan 2.

[0036] In order to ensure the stability of the whole system, the circulation pipe 1 is coated with heat-insulating cotton 8. And the fan 2 is set as an electric heating fan 2. In this way, the gaseous modifier can maintain its phase during the circulation process to avoid condensation, making the whole preparation process more stable and efficient.

[0037] The modifier volatilizer 3 is connected to the air outlet duct 6 and is located at the front end of the installation duct 7. The modifier volatilizer 3 includes a modifier storage tank 9, a purge pump 10 connected to the modifier storage tank 9, and a heater (not shown in the figure) arranged in the modifier storage tank (9). One end of the modifier storage tank 9 is connected to the air outlet duct 6.

[0038] The installation pipe 7 is a variable diameter pipe with small ends and large middle part. The installation pipe 7 is provided with flow equalizing plates 11 respectively located on both sides of the adsorption rack 4. The adsorption rack 4 is installed inside the installation pipe 7 to support the adsorption material 13. The adsorption rack 4 includes a plurality of partitions 12 arranged in layers and arranged parallel to each other in the installation pipe 7. The gap between two adjacent partitions 12 extends along the air flow direction, and the adsorption material 13 bypasses the partitions 12 in an S shape.

[0039] By arranging the adsorption material 13 in an S shape on the adsorption frame 4 and arranging flow equalizing plates 11 on both sides of the adsorption frame 4, the modifier can be uniformly adsorbed on the adsorption material 13 during the flow process, and the permeability is better and the efficiency is higher.

[0040] The circulation duct 1 is provided with a flow meter 14, which is located at the outlet end of the fan 2, that is, located on the outlet duct 6. The circulation duct 1 is provided with a temperature sensor 15, which is located at the inlet end of the fan 2, that is, located on the inlet duct 5. By arranging the flow meter 14 and the temperature sensor 15 on the circulation duct 1, the temperature and flow inside the circulation duct 1 can be controlled in real time, and the temperature of the heater and the air volume of the fan 2 can be adjusted according to the temperature and flow conditions.

[0041] Embodiment 2

[0042] like Figure 3 As shown, the difference from the first embodiment is that there are multiple installation pipes 7. In this embodiment, there are two installation pipes 7, and the multiple installation pipes 7 are connected in parallel. Adsorption racks 4 are provided in the installation pipes 7.

[0043] Embodiment 3

[0044] The difference from the first embodiment is that an electric heating wire (not shown in the figure) is arranged outside the circulation pipe 1. By setting the electric heating wire, the temperature difference between different areas in the circulation pipe 1 can be ensured to be small, and the temperature control effect is better.

[0045] The implementation principle of the utility model is:

[0046] By arranging the circulation pipeline 1, the fan 2, the modifier volatilizer 3, and the adsorption rack 4 in coordination, when the iodine adsorber is prepared, the adsorption material 13 is tested by the Freon method, and the qualified and leak-free adsorption material 13 is selected.

[0047] Then, the adsorption material 13 is assembled in an S shape on the adsorption frame 4, and the assembled adsorption frame 4 is placed in the installation pipe 7, and the modifier is injected into the modifier storage tank 9. The modifier is preferably a volatile organic or inorganic substance, such as triethylenediamine, hexamethylenetetramine, mercury, etc.

[0048] Subsequently, the fan 2 and the heater are turned on, and the airflow in the circulation pipe 1 is circulated by the fan 2 . The heating temperature of the heater is set, and the modifier in the modifier storage tank 9 is heated to a certain temperature to volatilize it and flow with the airflow in the circulation pipe 1 .

[0049] When the gaseous modifier passes through the adsorption rack 4, the modifier is uniformly adsorbed in the micropores of the activated carbon fiber by the adsorption material 13. After a certain period of attachment, the modification of the adsorption material 13 is completed.

[0050] The overall preparation process omits the impregnation and drying processes, shortens the preparation cycle, and greatly reduces the energy consumption required for drying. At the same time, through hot air circulation, the modifier can be adsorbed more evenly, the finished product effect is better, and the process is simple, the preparation cost is reduced, and the efficiency is higher.

[0051] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A preparation device for a radioactive iodine adsorber, characterized in that: include: A circulation duct (1) comprises an air inlet duct (5), an air outlet duct (6) and an installation duct (7), wherein two ends of the installation duct (7) are respectively connected to one end of the air inlet duct (5) and one end of the air outlet duct (6); The fan (2), the other end of the air inlet duct (5) is connected to the air inlet end of the fan (2), and the other end of the air outlet duct (6) is connected to the air outlet end of the fan (2); A modifier volatilizer (3) connected to the air outlet duct (6); The adsorption frame (4) is installed inside the installation pipe (7) and is used to support the adsorption material (13).

2. The preparation device for a radioactive iodine adsorber according to claim 1, characterized in that: The modifier volatilizer (3) comprises a modifier storage tank (9), a purge pump (10) connected to the modifier storage tank (9), and a heater arranged in the modifier storage tank (9); one end of the modifier storage tank (9) is connected to the air outlet duct (6).

3. The preparation device for a radioactive iodine adsorber according to claim 1, characterized in that: The circulation pipeline (1) is provided with a flow meter (14), and the flow meter (14) is located at the air outlet end of the fan (2).

4. The preparation device for a radioactive iodine adsorber according to claim 1, characterized in that: The circulation pipeline (1) is provided with a temperature sensor (15).

5. The preparation device for a radioactive iodine adsorber according to claim 1, characterized in that: The adsorption rack (4) comprises a plurality of partitions (12) which are stacked and arranged parallel to each other in the installation pipe (7), the gap between two adjacent partitions (12) extending along the air flow direction, and the adsorption material (13) passes around the partitions (12) in an S-shape.

6. The preparation device for a radioactive iodine adsorber according to claim 5, characterized in that: The installation pipe (7) is a variable diameter pipe with small ends and a large middle portion. The installation pipe (7) is provided with flow equalizing plates (11) located on both sides of a plurality of partitions (12).

7. The preparation device for a radioactive iodine adsorber according to claim 1, characterized in that: A plurality of the installation pipes (7) are provided, and the plurality of the installation pipes (7) are connected in parallel, and the adsorption rack (4) is provided in each of the installation pipes (7).

8. The preparation device for a radioactive iodine adsorber according to claim 1, characterized in that: The circulation pipe (1) is coated with thermal insulation cotton (8).

9. The preparation device for a radioactive iodine adsorber according to claim 8, characterized in that: The circulation pipeline (1) is provided with an electric heating wire.

10. The preparation device for a radioactive iodine adsorber according to claim 8, characterized in that: The fan (2) is an electric heating fan.

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