Iodine waste gas generation system and iodine waste gas adsorption evaluation system

Abstract

Embodiments of the present application provide a simulated iodine exhaust gas generation system. The system comprises: an air injection device configured to provide preheated air; an iodine vapor injection device configured to generate and deliver iodine vapor; a nitric oxide injection device configured to output nitric oxide; a nitrogen dioxide injection device configured to output nitrogen dioxide; a mixing container connected to the air injection device, the iodine vapor injection device, the nitric oxide injection device, and the nitrogen dioxide injection device, respectively, and configured to mix the air, the mixed gas, the nitric oxide, and the nitrogen dioxide to generate simulated iodine exhaust gas; wherein the flow rates of the air, the mixed gas, the nitric oxide, and the nitrogen dioxide are determined according to the composition of the iodine exhaust gas emitted during a nuclear fuel reprocessing process, so that the simulated iodine exhaust gas can be applied to iodine exhaust gas disposal experiments. Embodiments of the present application also provide an iodine exhaust gas adsorption evaluation system.

Description

TECHNICAL FIELD

[0001] At least one embodiment of the present application relates to the technical field of adsorption evaluation of iodine exhaust gas, and in particular to a simulated iodine exhaust gas generation system and an iodine exhaust gas adsorption evaluation system. BACKGROUND

[0002] A large amount of long-lived, radioactive iodine waste or iodine exhaust gas generated by a nuclear fuel reprocessing plant poses a potential threat of environmental pollution. Therefore, a reliable disposal method for radioactive iodine exhaust gas needs to be developed. Since iodine exhaust gas is highly radioactive, if it is used as the research object, it will impose extremely high protection requirements on the laboratory environmental conditions, test equipment and researchers. Therefore, the first problem in the process of researching or evaluating the disposal method of radioactive iodine exhaust gas is how to obtain iodine exhaust gas.

[0003] In addition, due to different sampling times, different sampling positions, different processes and working conditions of each reprocessing plant, and other reasons, the use of real radioactive iodine exhaust gas from a nuclear fuel reprocessing plant may result in a huge difference in composition or properties of the iodine exhaust gas used as the test raw material, thereby making the accuracy of the experimental results poor. SUMMARY

[0004] In view of the above problems, the present application is proposed in order to provide a simulated iodine exhaust gas generation system and an iodine exhaust gas adsorption evaluation system suitable for iodine exhaust gas disposal experiments, which can overcome the above problems or at least partially solve the above problems, and can obtain simulated iodine exhaust gas with controllable composition, content and yield to meet the demand of iodine exhaust gas disposal experiments for iodine exhaust gas raw materials.

[0005] According to a first aspect of an embodiment of the present application, a simulated iodine exhaust gas generation system for iodine exhaust gas disposal experiments is provided, comprising: an air injection device configured to provide preheated air; an iodine vapor injection device configured to generate and transport iodine vapor; a nitric oxide injection device configured to output nitric oxide; a nitrogen dioxide injection device configured to output nitrogen dioxide; and a mixing container connected with the air injection device, the iodine vapor injection device, the nitric oxide injection device and the nitrogen dioxide injection device respectively, and configured to mix the air, the mixed gas, the nitric oxide and the nitrogen dioxide to generate simulated iodine exhaust gas; wherein the flow rates of the air, the mixed gas, the nitric oxide and the nitrogen dioxide are determined according to the composition of the iodine exhaust gas discharged in the nuclear fuel reprocessing process, so that the simulated iodine exhaust gas can be applied to the iodine exhaust gas disposal experiments.

[0006] According to a second aspect of the embodiments of the present application, an iodine waste gas adsorption evaluation system is provided, comprising: a simulated iodine waste gas generation system configured to generate simulated iodine waste gas; an iodine adsorption device connected to the simulated iodine waste gas generation system and configured to adsorb the simulated iodine waste gas from the simulated iodine waste gas generation system, the iodine adsorption device being provided with a sampling port at an input end and an output end; and an iodine concentration detection and evaluation device connected to the sampling port, the iodine concentration detection and evaluation device being configured to detect iodine concentrations of the simulated iodine waste gas at the input end and the output end of the iodine adsorption device, and determine adsorption performance of the iodine adsorption device according to the two iodine concentrations.

[0007] The simulated iodine waste gas generation system provided by the embodiments of the present application can adjust flow rates of gases delivered by the air injection device, the iodine vapor injection device, the nitric oxide injection device, and the nitrogen dioxide injection device according to components of iodine waste gas discharged in a nuclear fuel reprocessing process, so that simulated iodine waste gas with controllable composition, content, and yield can be generated to meet the demand of iodine waste gas disposal experiments for iodine waste gas raw materials, reduce the difficulty of obtaining raw materials for iodine waste gas disposal experiments, and thus improve the accuracy of experimental results. BRIEF DESCRIPTION OF DRAWINGS

[0008] The above content of the present application and other purposes, features and advantages will be more apparent through the following description of the embodiments of the present application with reference to the accompanying drawings, in which:

[0009] Figure 1 FIG. 1 is a schematic diagram of a simulated iodine waste gas generation system according to an embodiment of the present application;

[0010] Figure 2 FIG. 2 is a schematic diagram of an iodine waste gas adsorption evaluation system according to an embodiment of the present application; and

[0011] Figure 3 FIG. 3 is a schematic diagram of an iodine waste gas adsorption evaluation system according to another embodiment of the present application.

[0012] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are merely shown in a schematic manner so as not to affect the understanding of the reader. DETAILED DESCRIPTION

[0013] In order to make the purposes, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are one embodiment of the present application, rather than all embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0014] It should be noted that the technical terms or scientific terms used in the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs, unless otherwise defined. If the description of "first", "second" and the like is involved throughout the text, the "first", "second" and the like are only constructed to distinguish similar objects, and cannot be understood as indicating or implying the relative importance, the order of precedence or implying the number of indicated technical features. It should be understood that the data of "first", "second" and the like description can be interchanged under appropriate circumstances. If "and / or" appears throughout the text, it means that three parallel schemes are included. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme.

[0015] The embodiments of the present application first provide a simulated iodine waste gas generation system suitable for iodine waste gas disposal experiments. Referring to Figure 1 , the simulated iodine waste gas generation system 100 includes an air injection device 10, an iodine vapor injection device 20, a nitric oxide injection device 30, a nitrogen dioxide injection device 40 and a mixing container 50.

[0016] The air injection device 10 is configured to provide preheated air, the iodine vapor injection device 20 is configured to generate and deliver iodine vapor, the nitric oxide injection device 30 is configured to output nitric oxide, and the nitrogen dioxide injection device 40 is configured to output nitrogen dioxide. The mixing container 50 is configured to mix air, mixed gas, nitric oxide and nitrogen dioxide to generate simulated iodine waste gas. Among them, the flow rates of air, mixed gas, nitric oxide and nitrogen dioxide are determined according to the composition of the iodine waste gas discharged in the nuclear fuel reprocessing process, so that the simulated iodine waste gas is applied to the iodine waste gas disposal experiment. Specifically, the flow rates of air, mixed gas, nitric oxide and nitrogen dioxide can be determined according to the composition of the iodine waste gas discharged by the nuclear fuel reprocessing plant.

[0017] In the present embodiment, the iodine vapor injection device 20 includes an iodine generator 21 and a nitrogen source 22. The iodine generator 21 is configured to contain solid iodine and heat the contained solid iodine to generate iodine vapor. The nitrogen source 22 is in communication with the iodine generator 21 and is configured to deliver nitrogen to the iodine generator 21 to carry the iodine vapor in the iodine generator 21 to the mixing container 50. Among them, a certain amount of iodine can be pre-added in the iodine generator 21 to provide corresponding iodine vapor for subsequent generation of simulated iodine waste gas. The heating temperature in the iodine generator 21 ranges from 100 to 200°C, which can sublimate the solid iodine.

[0018] In the embodiment, before the preparation of the iodine exhaust gas begins, the flow rates of the gases output by the different injection devices are first determined according to the composition of the iodine exhaust gas discharged by the nuclear fuel reprocessing process, and then a certain mass of solid iodine is placed in the iodine generator 21, and after the simulated iodine exhaust gas generation system 100 is started, the multiple injection devices synchronously perform the delivery of the gases. Among them, the air injection device 10 delivers the preheated air containing a certain amount of water vapor to the mixing container 50, the iodine generator 21 generates iodine vapor by heating the solid iodine to sublimate, the generated iodine vapor is carried by the nitrogen gas delivered by the nitrogen source 22, and the iodine vapor injection device delivers the mixed gas containing the iodine vapor to the mixing container 50. At the same time, the nitric oxide injection device 30 and the nitrogen dioxide injection device 40 respectively deliver the set flow rates of the nitric oxide and the nitrogen dioxide to the mixing container 50. The above-mentioned multiple gases are mixed in the mixing container 50 to obtain the simulated iodine exhaust gas with the same composition as the real iodine exhaust gas discharged by the nuclear fuel reprocessing process, so that the simulated iodine exhaust gas can be used to timely perform the iodine exhaust gas disposal experiment.

[0019] The simulated iodine exhaust gas generation system 100 provided by the embodiment can adjust the flow rates of the gases delivered by the air injection device 10, the iodine vapor injection device 20, the nitric oxide injection device 30 and the nitrogen dioxide injection device 40 according to the composition of the iodine exhaust gas discharged by the nuclear fuel reprocessing plant, so that the simulated iodine exhaust gas with controllable composition, content and yield can be generated to meet the demand of the iodine exhaust gas disposal experiment for the iodine exhaust gas raw material, solve the problem that the real iodine exhaust gas is not easy to obtain and the change of the physicochemical properties of the real iodine exhaust gas during the transportation process affects the accuracy of the subsequent iodine exhaust gas disposal experiment, reduce the difficulty of obtaining the raw material of the iodine exhaust gas disposal experiment, and further improve the accuracy of the experimental results of the iodine exhaust gas disposal experiment.

[0020] In some embodiments, in the process of preparing the simulated iodine exhaust gas by using the simulated iodine exhaust gas generation system, the required air content is 80% to 90%, the nitrogen gas carrying the iodine vapor content is 1% to 4% (wherein the iodine content is controlled to be 1 to 50 ppm), the nitrogen oxide (NO, NO2) content is 1% to 20%, and the water vapor (relative humidity 20% to 80%) content is 0.5% to 2%.

[0021] In the embodiment, the temperature in the containing cavity of the iodine generator 21 is controlled in the range of 25 to 200℃, and the flow rate of the nitrogen gas is controlled by the programmable logic controller to control the amount of nitrogen gas carrying iodine in the range of 5 to 50 ppm.

[0022] In the embodiment, the flow rate of the air ranges from 1 to 500 L / min, the flow rate of the nitrogen gas ranges from 3 to 30 L / min, the flow rate of the nitric oxide ranges from 3 to 30 L / min, and the flow rate of the nitrogen dioxide ranges from 3 to 30 L / min.

[0023] In one embodiment, 190 g of iodine is added to the iodine generator 21, the temperature of the iodine generator 21 is set to 130°C by the programmable logic controller, the temperature of the air injection device 10 is set to 250°C, the flow rate of the air is set to 450 L / min, the flow rate of the nitrogen gas output from the nitrogen source 22 is set to 10 L / min, the flow rate of the nitric oxide output from the nitric oxide injection device 30 is set to 10 L / min, and the flow rate of the nitrogen dioxide output from the nitrogen dioxide injection device 40 is set to 10 L / min, so that the simulated iodine exhaust gas with an iodine concentration of 50 ppm can be generated.

[0024] In another embodiment, 190 g of iodine is added to the iodine generator 21, the temperature of the iodine generator 21 is set to 120°C by the programmable logic controller, the temperature of the air injection device 10 is set to 250°C, the flow rate of the air is set to 200 L / min, the flow rate of the nitrogen gas output from the nitrogen source 22 is set to 20 L / min, the flow rate of the nitric oxide output from the nitric oxide injection device 30 is set to 10 L / min, and the flow rate of the nitrogen dioxide output from the nitrogen dioxide injection device 40 is set to 10 L / min, so that the simulated iodine exhaust gas with an iodine concentration of 32 ppm can be generated.

[0025] In this embodiment, the simulated iodine exhaust gas generation system 100 further comprises a detection unit. The detection unit is configured to detect the components of the iodine exhaust gas discharged in the nuclear fuel reprocessing process, so as to generate the simulated iodine exhaust gas according to the detected components.

[0026] In this embodiment, the detection unit can refer to a plurality of sensors for detecting the content of different gas components.

[0027] In this embodiment, since the iodine exhaust gas treatment experiment is usually carried out by collecting the real iodine exhaust gas discharged from the nuclear fuel reprocessing plant, the real radioactive iodine exhaust gas from the nuclear fuel reprocessing plant may have great differences in composition or properties due to different sampling times, different sampling positions, different reprocessing plant processes and working conditions, etc., which increases the difficulty of subsequent research. Therefore, the components of the real iodine exhaust gas can be detected by the detection unit at the required sampling position of the nuclear fuel reprocessing plant, so that the simulated iodine exhaust gas with the same components can be prepared by the simulated iodine exhaust gas generation system 100 of this embodiment to carry out the subsequent iodine exhaust gas treatment experiment, which can reduce the difficulty of subsequent research and ensure the detection accuracy of the iodine exhaust gas treatment experiment.

[0028] In this embodiment, with reference to Figure 1The iodine vapor injection device 20 further comprises a nitrogen mass flow controller 23 and / or a nitrogen rotameter 24, both of which are connected between the iodine generator 21 and a nitrogen source 22. The nitrogen mass flow controller 23 is configured to control the flow rate of the nitrogen output by the nitrogen source 22; and the nitrogen rotameter 24 is configured to count the total amount of the nitrogen output by the nitrogen source 22.

[0029] In this embodiment, in order to more accurately control the flow of nitrogen, the nitrogen mass flow controller 23 can be configured to respond to control instructions of the programmable logic controller, thereby accurately controlling the output flow of nitrogen. The nitrogen rotameter 24 is configured to facilitate control of the total amount of nitrogen output by the nitrogen source 22, thereby avoiding the composition of the finally generated simulated iodine exhaust gas being different from that of the real iodine exhaust gas.

[0030] It should be noted that the amount of nitrogen injection is small, and its main role is to carry the iodine vapor generated by the iodine generator 21.

[0031] In this embodiment, a pressure reducing valve and a pressure gauge can also be provided on the pipeline between the nitrogen source 22 and the nitrogen mass flow controller 23, to detect the pressure of the output nitrogen in real time. Since the nitrogen is transported by the action of pressure difference, the provision of the pressure reducing valve and the pressure gauge facilitates control of the flow rate of the transported nitrogen.

[0032] In this embodiment, with reference to Figure 1 The air injection device 10 comprises an air compressor 11, an air mass flow controller 13, an air rotameter 14, and an air preheating device 15. The air compressor 11 is configured to generate air; the air preheating device 15 is connected to the air compressor 11 and is configured to heat the air output by the air compressor 11; the air mass flow controller 13 is connected between the air compressor 11 and the air preheating device 15 and is configured to control the flow rate of the air; and the air rotameter 14 is connected between the air compressor 11 and the air preheating device 15 and is configured to count the total amount of the air.

[0033] The air injection device 10 in this embodiment heats the air generated by the air compressor 11 through the air preheating device 15, so that the air reaches the required temperature for simulating the exhaust gas. In some embodiments, the air injection device 10 can provide air at about 250°C. Furthermore, the air mass flow controller 13 is configured to accurately control the output flow of the air, and the air rotameter 14 is configured to facilitate control of the total amount of the air output by the nitrogen source 22, thereby avoiding the composition of the finally generated simulated iodine exhaust gas being different from that of the real iodine exhaust gas.

[0034] In some embodiments, the air injection device 10 further comprises an air buffer tank 12, which is connected downstream of the air compressor 11 and upstream of the air mass flow controller 13 and the air rotameter 14, and is configured to store the air output by the air compressor 11 to serve as a buffer for the air to prevent pressure fluctuation of the air and facilitate the provision of air with stable pressure.

[0035] In some embodiments, the air injection device 10 further comprises a steam injection device 16, which is connected downstream of the air preheating device 15 and is configured to output water to mix water vapor into the heated air so that the composition of the simulated iodine exhaust gas is the same as that of the real iodine exhaust gas.

[0036] In this embodiment, during the preparation of the simulated iodine exhaust gas, the air compressor 11 works to compress and store the external air in the air buffer tank 12, the air mass flow controller 13 responds to the control instructions of the programmable logic controller to accurately control the air flow output by the air buffer tank 12, and the air rotameter 14 is provided to facilitate the control of the total amount of the output air to avoid the composition of the finally generated simulated iodine exhaust gas being different from that of the real iodine exhaust gas. The air output after being counted is heated (e.g., to 250°C) in the air preheating device 15, and then the heated air can evaporate the liquid water in the steam injection device 16, so that the heated air carrying water vapor enters the mixing container 50.

[0037] In this embodiment, a pressure reducing valve can also be provided between the air compressor 11 and the air buffer tank 12 to control the pressure of the delivered air. At the same time, a pressure gauge is provided in the air buffer tank 12 to detect the internal pressure of the air buffer tank 12. The provision of the pressure gauge provides reference data to facilitate the control of the size of the air flow delivered by the air buffer tank 12 to the mixing container 50.

[0038] In this embodiment, the air preheating device 15 comprises at least two preheaters, which are connected to the air compressor 11 and are configured to segmentally heat the air output by the air compressor 11.

[0039] In the embodiment, in order to enable the air injection device 10 to output air meeting the temperature requirement, the air output by the air compressor 11 can be segmented heated by at least two preheaters, for example, a first preheater can heat the air to a first temperature, and a second preheater can heat the air preheated to the first temperature to a second temperature (i.e. the target temperature), so that the air injection device 10 can output preheated air. It should be noted that the first temperature can be less than or equal to the second temperature, for example, when the target temperature is 250℃, the first temperature can be 150℃, or 250℃, and when there are three or more preheaters, the air can be gradient heated by the preheaters, so that the air can realize gradient rising in temperature in the preheaters, thereby improving the uniformity of air heating.

[0040] In the embodiment, the steam injection device 16 includes a water source 17 and a liquid driver 18. The liquid driver 18 is connected with the water source 17 and is configured to transport water in the water source 17 and deliver the water downstream of the air preheating device 15. The delivered water forms water vapor under the action of the heated air output by the preheater and enters the mixing container 50. The water source 17 can be a water storage tank, and the liquid driver 18 can be a peristaltic pump.

[0041] In the embodiment, when preparing simulated iodine exhaust gas with an iodine concentration of 50ppm, the liquid driver 18 can transport water in the water source 17, wherein the flow rate of the transported water is 6.8g / min. When preparing simulated iodine exhaust gas with an iodine concentration of 32ppm, the liquid driver 18 can transport water in the water source 17, wherein the flow rate of the transported water is 2.1g / min. Therefore, the flow rate of the liquid driver 18 changes with the change of the iodine concentration in the simulated iodine exhaust gas.

[0042] In the embodiment, with reference to Figure 1 Either of the nitric oxide injection device 30 and the nitrogen dioxide injection device 40 includes a nitrogen oxide storage container, a nitrogen oxide mass flow controller and a nitrogen oxide rotameter. The nitrogen oxide storage container is configured to store nitric oxide or nitrogen dioxide; the nitrogen oxide mass flow controller is connected with the nitrogen oxide storage container and is configured to control the flow rate of the nitric oxide or nitrogen dioxide output by the nitrogen oxide storage container; and the nitrogen oxide rotameter is connected with the nitrogen oxide storage container and is configured to count the total amount of the gas output by the nitrogen oxide storage container.

[0043] In the embodiment, the nitric oxide mass flow controller 32 and the nitrogen dioxide mass flow controller 42 are controlled by the programmable logic controller, so as to precisely control the flow of the nitric oxide and the nitrogen dioxide output from the nitric oxide storage container 31 and the nitrogen dioxide storage container 41 respectively, and control the total amount of the output nitric oxide or nitrogen dioxide through the nitric oxide rotameter 33 and the nitrogen dioxide rotameter 43 respectively, so as to avoid the difference between the composition of the generated simulated iodine exhaust gas and the composition of the real iodine exhaust gas.

[0044] In some embodiments, the nitric oxide and the nitrogen dioxide can be mixed before entering the mixing container 50, and then mixed with the other components of the gas in the mixing container 50.

[0045] In the embodiment, a pressure reducing valve and a pressure gauge can be further arranged on the pipeline between the nitrogen oxide storage container and the nitrogen oxide mass flow controller, so as to detect the pressure of the output nitric oxide or nitrogen dioxide in real time. Since the delivery of the nitric oxide or nitrogen dioxide is realized by the pressure difference, the arrangement of the pressure reducing valve and the pressure gauge facilitates the control of the flow of the delivered nitric oxide or nitrogen dioxide.

[0046] In addition, in some embodiments, the mixing container 50 can be a mixing pipeline arranged at the output end of the simulated iodine exhaust gas generation system 100, so as to mix the air, the iodine vapor, the nitric oxide and the nitrogen dioxide in the mixing pipeline, thereby saving the container equipment and simplifying the process flow.

[0047] The embodiment of the present application further provides an iodine exhaust gas adsorption evaluation system, which refers to Figure 2 The iodine exhaust gas adsorption evaluation system 200 comprises the simulated iodine exhaust gas generation system 100, the iodine adsorption device 60 and the iodine concentration detection evaluation device 70 as described above. The iodine exhaust gas generation system is configured to generate simulated iodine exhaust gas; the iodine adsorption device 60 is connected with the simulated iodine exhaust gas generation system 100 and is configured to perform adsorption treatment on the simulated iodine exhaust gas from the simulated iodine exhaust gas generation system 100, and the input end and the output end of the iodine adsorption device 60 are both provided with a sampling port; the iodine concentration detection evaluation device 70 is connected with the sampling port of the iodine adsorption device 60, and the iodine concentration detection evaluation device 70 is configured to detect the iodine concentration of the simulated iodine exhaust gas at the input end and the output end of the iodine adsorption device 60, and determine the adsorption performance of the iodine adsorption device 60 according to the detected iodine concentrations at the two positions.

[0048] In one embodiment, the iodine concentration detection and evaluation device 70 is configured to detect the iodine concentration in the simulated iodine exhaust gas generated by the simulated iodine exhaust gas generation system 100 at the sampling port at the input end of the iodine adsorption device 60. For example, the simulated iodine exhaust gas can be absorbed by a sodium hydroxide solution of a certain concentration, and then titrated by a silver nitrate solution to detect the iodine concentration in the simulated iodine exhaust gas before it is input into the iodine adsorption device 60. The iodine concentration in the simulated iodine exhaust gas at the sampling port at the output end of the iodine adsorption device 60 is detected in the same way, so that the iodine concentrations of the gas at the input end and the output end of the iodine adsorption device 60 can be determined, and the adsorption performance of the iodine adsorption device 60 can be determined based on the two iodine concentrations. For example, the breakthrough time (adsorbent failure time) of the adsorbent in the iodine adsorption device 60 can be determined, as well as the composition and properties of the simulated iodine exhaust gas at the input end and the output end.

[0049] In this embodiment, the adsorption performance of the iodine adsorption device 60 is detected by adsorption evaluation of the simulated iodine exhaust gas generated by the simulated iodine exhaust gas generation system 100. Since the composition and physicochemical properties of the generated simulated iodine exhaust gas are approximately the same as those of the real iodine exhaust gas, the detected adsorption performance of the iodine adsorption device 60 is relatively accurate, avoiding the problem of poor accuracy of the detection results caused by the use of real iodine exhaust gas with a long sampling time during iodine exhaust gas adsorption evaluation.

[0050] In this embodiment, with reference to Figure 3 , the iodine exhaust gas adsorption evaluation system 200 further comprises a tail gas treatment device 81, at least two temperature transmitters 82, and at least two adsorption pressure gauges 83. The tail gas treatment device 81 is connected to the output end of the iodine adsorption device 60 and is configured to treat the iodine exhaust gas output by the iodine adsorption device 60. The at least two temperature transmitters 82 are respectively arranged at the input end and the output end of the iodine adsorption device 60 and are respectively configured to detect the temperature of the simulated iodine exhaust gas at the input end and the output end of the iodine adsorption device 60. The at least two adsorption pressure gauges 83 are respectively arranged at the input end and the output end of the iodine adsorption device 60 and are respectively configured to detect the pressure of the simulated iodine exhaust gas at the input end and the output end of the iodine adsorption device 60. The iodine concentration detection and evaluation device 70 is further configured to determine the adsorption performance of the iodine adsorption device 60 based on the iodine concentration, the temperature, and the pressure.

[0051] In this embodiment, in order to avoid pollution of the environment by the simulated iodine exhaust gas after use of the iodine exhaust gas adsorption evaluation system 200, the simulated iodine exhaust gas after the experiment can be adsorbed and treated by the tail gas treatment device 81. For example, the tail gas treatment device 81 can be an adsorption tank containing an adsorbent to absorb the iodine exhaust gas.

[0052] In the embodiment, in order to more accurately evaluate the adsorption performance, the temperature and pressure can be assisted, for example, when the pressures of the simulated iodine exhaust gas at the input end and the output end of the iodine adsorption device 60 are the same, it can be determined that the iodine adsorption device 60 loses the adsorption capacity, and the time when the iodine adsorption device 60 loses the adsorption capacity can also be predicted through the change of the pressure.

[0053] In the embodiment, the iodine adsorption device 60 includes an adsorption box and an adsorption column. The adsorption column is arranged in the adsorption box, wherein the adsorption column is filled with silver-attached silica gel, and the silver-attached silica gel is configured to perform the adsorption treatment on the iodine.

[0054] In the embodiment, after the simulated iodine exhaust gas enters the adsorption box, the iodine in the simulated iodine exhaust gas can be absorbed by the silver-attached silica gel in the adsorption column, so that the iodine exhaust gas after the adsorption treatment is output from the output end of the adsorption box.

[0055] In the embodiment, in order to prepare the silver-attached silica gel for adsorbing iodine, a predetermined mass of silica gel can be soaked in a silver nitrate solution with a predetermined concentration; the silica gel after the soaking is completed is subjected to a drying treatment to obtain the silver-attached silica gel.

[0056] In the embodiment, when the silver-attached silica gel is prepared, a certain mass of silica gel can be soaked in a silver nitrate solution with a predetermined concentration, the soaking time is about 12h (the soaking time changes with the concentration of the silver nitrate solution), and then the silica gel after the soaking is completed is placed in an oven, the temperature is set to 130℃, and the drying is performed for 3h, so that the silver-attached silica gel is obtained.

[0057] In the embodiment, when the silver-attached silica gel is prepared, the silver-attached silica gel can also be subjected to a screening treatment to screen out the silica gel broken during the soaking, so that the silver-attached silica gel with better quality after the screening is obtained.

[0058] In the embodiment, since part of the silica gel is broken during the soaking, the broken silica gel has poor adsorption performance during the adsorption, and therefore the silver-attached silica gel after the drying can be screened to screen out the silica gel broken during the soaking, so that the silver-attached silica gel with better adsorption performance is obtained.

[0059] The application has been described in detail in combination with the drawings and the embodiments, but the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application. The contents not described in detail in the application can adopt the prior art.

Claims

1. A simulated iodine off-gas generation system for iodine off-gas disposal experiments, wherein, The system comprises: an air injection device configured to provide preheated air; an iodine vapor injection device configured to generate and deliver iodine vapor; a nitric oxide injection device configured to output nitric oxide; a nitrogen dioxide injection device configured to output nitrogen dioxide; a mixing container connected to the air injection device, the iodine vapor injection device, the nitric oxide injection device, and the nitrogen dioxide injection device, respectively, and configured to mix the air, the mixed gas, the nitric oxide, and the nitrogen dioxide to generate simulated iodine exhaust gas; wherein the flow rates of the air, the mixed gas, the nitric oxide, and the nitrogen dioxide are determined according to the composition of the iodine exhaust gas emitted during the nuclear fuel reprocessing process; wherein the air injection device, the iodine vapor injection device, the nitric oxide injection device, and the nitrogen dioxide injection device are configured to simultaneously deliver the gases after the simulated iodine exhaust gas generation system is started; wherein the mixing container is a mixing pipeline provided at the output end of the simulated iodine exhaust gas generation system, so that the air, the iodine vapor, the nitric oxide, and the nitrogen dioxide are mixed in the mixing pipeline.

2. The simulated iodine waste generation system of claim 1, wherein, The iodine vapor injection device comprises: an iodine generator configured to contain solid iodine and heat the solid iodine to generate iodine vapor; and a nitrogen source in communication with the iodine generator and configured to deliver nitrogen gas to the iodine generator to carry the iodine vapor in the iodine generator from the iodine generator to the mixing container.

3. The simulated iodine waste generation system of claim 1, wherein, Further comprising: a detection unit configured to detect the composition of the iodine exhaust gas emitted during the nuclear fuel reprocessing process.

4. The simulated iodine exhaust generation system of claim 2, wherein, The iodine vapor injection device further comprises: a nitrogen mass flow controller connected between the iodine generator and the nitrogen source and configured to control the flow rate of the nitrogen gas output by the nitrogen source; and / or a nitrogen rotameter connected between the iodine generator and the nitrogen source and configured to count the total amount of the nitrogen gas output by the nitrogen source.

5. The simulated iodine exhaust generation system of claim 1, wherein, The air injection device comprises: an air compressor configured to generate air; an air preheating device connected to the air compressor and configured to heat the air output by the air compressor; an air mass flow controller connected between the air compressor and the air preheating device and configured to control the flow rate of the air; an air rotameter connected between the air compressor and the air preheating device and configured to count the total amount of the air.

6. The simulated iodine exhaust gas generating system according to claim 5, wherein, The air injection device further comprises: an air buffer tank connected downstream of the air compressor and upstream of the air mass flow controller and the air rotameter and configured to store the air output by the air compressor.

7. The simulated iodine exhaust generation system of claim 5, wherein, The air injection device further comprises: a steam injection device connected downstream of the air preheating device and configured to output water to mix water vapor into the heated air.

8. The simulated iodine exhaust gas generating system according to claim 7, wherein, The air preheating device comprises: at least two preheaters connected to the air compressor and configured to heat the air output by the air compressor in stages; wherein the steam injection device comprises: a water source; A liquid driver, connected to the water source, configured to deliver water in the water source to downstream of the air preheater, the delivered water entering the mixing vessel under the action of the heated air output by the preheater.

9. The simulated iodine exhaust generation system of claim 1, wherein, Either of the nitric oxide injection device and the nitrogen dioxide injection device comprises: A nitric oxide storage container configured to store nitric oxide or nitrogen dioxide; A nitric oxide mass flow controller connected to the nitric oxide storage container and configured to control the flow rate of nitric oxide or nitrogen dioxide output by the nitric oxide storage container; A nitric oxide rotameter connected to the nitric oxide storage container and configured to count the total amount of gas output by the nitric oxide storage container.

10. An iodine exhaust gas adsorption evaluation system, wherein, Comprising: The simulated iodine exhaust gas generation system according to any one of claims 1-9, wherein the iodine exhaust gas generation system is configured to generate simulated iodine exhaust gas; An iodine adsorption device connected to the simulated iodine exhaust gas generation system and configured to perform adsorption treatment on the simulated iodine exhaust gas from the simulated iodine exhaust gas generation system, the input end and the output end of the iodine adsorption device being provided with a sampling port; An iodine concentration detection and evaluation device connected to the sampling port, the iodine concentration detection and evaluation device being configured to detect the iodine concentration of the gas at the input end and the output end of the iodine adsorption device, and determine the adsorption performance of the iodine adsorption device according to the iodine concentration.

11. The iodine exhaust gas adsorption evaluation system according to claim 10, wherein Further comprising: An exhaust gas treatment device connected to the output end of the iodine adsorption device and configured to treat the gas output by the iodine adsorption device; At least two temperature transmitters respectively arranged at the input end and the output end of the iodine adsorption device and respectively configured to detect the temperature of the gas at the input end and the output end of the iodine adsorption device; At least two adsorption pressure gauges respectively arranged at the input end and the output end of the iodine adsorption device and respectively configured to detect the pressure of the gas at the input end and the output end of the iodine adsorption device; Wherein, the iodine concentration detection and evaluation device is further configured to determine the adsorption performance of the iodine adsorption device according to the iodine concentration, the temperature and the pressure.

12. The iodine exhaust gas adsorption evaluation system according to claim 10, wherein, The iodine adsorption device comprises: An adsorption box; An adsorption column arranged in the adsorption box, wherein the adsorption column is filled with silver-attached silica gel, and the silver-attached silica gel is configured to perform adsorption treatment on iodine.

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