1. An experimental system for carrying out performance test on methyl iodide adsorbing materials is characterized in that: the device comprises an air compressor (1), a steam supply device (2), a methyl iodide supply device (3), a steam-water separation device (4), an experimental adsorption bed (5), a control bed (6), a condenser A (7), a cooling water tank (8), a water pump (9), a condenser B (10), a steam-water separator A (11), a steam-water separator B (12), a gas chromatograph (13), a data acquisition system (14) and a temperature control system (15);

the rear part of the air compressor (1) is respectively connected with a steam supply device (2) and a methyl iodide supply device (3) through two branch pipes;

a steam-water separation device (4) is connected behind the steam supply device (2) and the methyl iodide supply device (3);

two branch pipes, namely a branch pipe A and a branch pipe B, are arranged at the rear end of the steam-water separation device (4);

the branch pipe A is connected with the experimental adsorption bed (5) and the control bed (6) through a three-way valve A, and the branch pipe B is connected with the condenser A (7);

the tail ends of the experimental adsorption bed (5) and the control bed (6) are connected with a condenser B (10) through a pipeline and a three-way valve B;

the water pump (9) is respectively connected with the condenser A (7) and the condenser B (10) through a pipeline and valve control;

supplying cooling water in a cooling water tank (8) to a condenser A (7) and a condenser B (10) by starting a water pump (9);

outlets of the condenser A (7) and the condenser B (10) are respectively connected with inlets of a steam-water separator A (11) and a steam-water separator B (12) through pipelines, and outlets of the steam-water separator A (11) and the steam-water separator B (12) are respectively communicated with atmosphere and a gas chromatograph (13) through outlet pipelines and valve control;

the data acquisition system (14) is used for acquiring experimental data;

the temperature control system (15) is used for controlling the temperature of the experimental loop to be within the range required by the experimental working condition.

2. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 1, wherein: the air compressor (1) provides high-pressure air in the experimental process, one part of the high-pressure air is supplied to the methyl iodide supply device (3), the other part of the high-pressure air enters the steam supply device (2), the proportioning relation of different steam and non-condensable gas can be realized under the conditions of different temperatures and pressures, and the high-pressure air is used for simulating multi-component gas which is generated in a containment vessel and is discharged outwards and before being filtered and is generated under different time processes after an accident occurs.

3. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 1, wherein: liquid methyl iodide in the methyl iodide supply device (3) is heated and vaporized under constant temperature control, and dry air supplied by the air compressor (1) carries methyl iodide steam to enter the steam-water separation device (4).

4. An experimental system for performing performance tests on a methyl iodide adsorbent material according to claim 3, wherein: the methyl iodide supply device (3) takes a constant temperature control box as a main body, and a tank body for storing liquid methyl iodide is arranged in the constant temperature control box.

5. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 1, wherein: deionized water is filled in the steam supply device (2), the temperature and the outlet pressure of the steam supply device (2) are controlled by electric heating, then dry air supplied by the air compressor (1) is introduced, and after the gas flow is stable, the water vapor share can be accurately controlled by controlling the temperature and the outlet pressure of the steam supply device (2).

6. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 5, wherein: the gas inlet pipeline outlet of the steam supply device (2) is provided with a gas-equalizing hole plate and fixed in the liquid phase, so that gas enters the liquid phase in a bubbling mode, the gas-liquid contact area is increased, and the mixed gas with uniform and stable steam content can be generated under the condition of stable air outlet pressure.

7. An experimental system for performing performance tests on a methyl iodide adsorbent material according to claim 6, wherein: the size of the gas bubbles can be calculated according to the following formula, the evaporation rate of water is calculated according to the size of the gas bubbles, and the size of the opening of the gas-equalizing hole plate is designed to ensure that the humidity of the gas can reach saturation after the gas bubbles rise to the liquid level;

in the formula (d)_bIs the bubble diameter, m; d_oThe diameter of the opening of the gas-homogenizing hole plate is m; rho is the liquid density, kg/m³(ii) a Sigma is the surface tension of the liquid, N/m; v is the kinematic viscosity m²/s；Q_oIs the orifice gas flow rate, m³S; g is gravity acceleration m/s²。

8. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 5, wherein: the main body of the steam supply device (2) is an electric heating boiler and is provided with a temperature sensor and a pressure sensor.

9. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 1, wherein: a water storage cavity is designed at the front end of the steam-water separation device (4), a drain valve is arranged at the bottom of the water storage cavity, hot water is stored in the water storage cavity, incoming flow gas can be preheated, and meanwhile, large liquid drops in the gas can be retained in the water storage cavity;

the steam-water separation device (4) is integrally and obliquely arranged, and the front water storage cavity is arranged below.

10. The experimental system for performing performance testing on a methyl iodide adsorbent material of claim 9, wherein: the rear end of the steam-water separation device (4) is provided with metal fibers, and micro-nano-scale liquid drops in the gas can be further filtered in a physical interception mode.

11. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 10, wherein: the rear end of the steam-water separation device (4) is provided with fixed metal fibers through a hollow flange structure, and is sealed by bolts, so that a plurality of layers of metal fibers can be stacked.

12. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 1, wherein: the experimental adsorption bed (5) is filled with a target adsorption material to be tested, and the control bed (6) is filled with a base material with the same structural parameters and does not contain any adsorption material.

13. The experimental system for performing performance testing on a methyl iodide adsorbent material according to claim 12, wherein: the experimental adsorption bed (5) and the control bed (6) are cylindrical barrel structures, and the side walls of the experimental adsorption bed and the control bed are respectively provided with a thermocouple base and a pressure sampling pipe of a pressure sensor so as to acquire and measure the temperature and the gas pressure of a bed layer in real time and can be used for comparison and verification of adsorption efficiency data.

14. An experimental system for performance testing of a methyl iodide adsorbing material as claimed in any one of claims 1 to 13, wherein: before the experiment, firstly, whether each instrument is normal or not and whether the instrument is in a verification period are checked, and then a water pump (9) is started to provide cooling water for a condenser A (7) and a condenser B (10);

then the temperature of the test loop is controlled by a temperature control system (15), and then whether the data acquisition system (14) and the related temperature and pressure measuring instrument display normal or not is verified; switching a flow path to a control bed (6) by using a three-way valve A, starting an air compressor (1), a steam supply device (2) and a methyl iodide supply device (3), adjusting the pressure, the temperature and the steam share of the system to be within the range required by the experimental working condition, measuring to obtain the methyl iodide concentration before adsorption, and switching the flow path to an experimental adsorption bed (5);

in the experiment, after the incoming flow gas enters the condenser B (10), the water vapor in the incoming flow gas is cooled, and the rest gas enters the steam-water separator B (12), is further dried and then is exhausted to the atmosphere through an outlet pipeline; then opening a valve for sampling, introducing part of the residual gas into a gas chromatograph (13), measuring the methyl iodide concentration in the sample gas after adsorption on line through the gas chromatograph (13), and comparing the methyl iodide concentration with the methyl iodide concentration before adsorption to calculate the adsorption efficiency;

after the experiment is finished, the methyl iodide supply device (3), the steam supply device (2), the air compressor (1), the temperature control system (15), the data acquisition system (14) and the water pump (9) are closed in sequence.

15. The experimental system for performing performance testing on a methyl iodide adsorbent material of claim 14, wherein: is suitable for the environment with the temperature up to 200 ℃ and the pressure of 1 MPa.

Background

The pressure in the containment vessel is gradually increased after a serious accident of the nuclear power plant, and the integrity of the containment vessel can be damaged due to overpressure under the condition that a containment vessel cooling system fails, so that radioactive substances are leaked out. The containment filtration and discharge system reduces the pressure in the containment by adopting an active pressure relief mode, so that the pressure in the containment does not exceed the bearing limit value of the pressure, and the integrity of the containment is ensured; meanwhile, in order to prevent the exhaust gas from causing radioactive damage to the environment, a filtering device is arranged on a pressure relief pipeline of the containment filtering and exhausting system to filter radioactive substances in the exhaust gas. The radioactive substances in the exhaust gas mainly exist in the forms of aerosol (CsI, CsOH), gaseous elementary iodine and gaseous organic iodine, and in the past nuclear power projects, the content of organic iodine is low and the organic iodine is not easy to measure, so quantitative experimental measurement on the filtering efficiency of the organic iodine is not required, but after the Fudao nuclear accident, the organic iodine is found to be high in content in the released radioactive substances, and the organic iodine is easily absorbed by the thyroid gland of a human body and causes harm to the human body, so that the filtering efficiency of the new generation of containment filtering and discharging system on the organic iodine needs to be improved.

At present, the research on the performance of the organic iodine adsorption material is less in China, and the experimental device and the method for the tritium adsorption performance designed in the patent 202010542892.3 aim at the research on the adsorption performance of the adsorbent under the conditions of normal temperature and normal pressure, but are not suitable for complex thermal conditions.

Foreign research on the adsorption performance of iodomethane is deep, and the document Silver-mordenite for radio logic gas capture from complex streams₃An experimental device is designed in an I composition and aims at the performance test experiment of an adsorption material under the condition of multi-component gas, a multi-adsorption-bed series-connection design is adopted, the experimental study is carried out on the influence of complex gas components under the condition of serious accidents, instruments such as an inductively coupled plasma mass spectrometer, a gas chromatography-flame ionization detector and the like are adopted for measurement, but the influence of thermal parameters is not considered, and the device is not suitable for the working condition of high temperature, high pressure and high steam content in the aspects of structure and measurement function. The literature "Effects of water vapor and temperature on the coverage of radiotoxin CH₃An experimental device is designed in an I by silver faujasite zeolites experiment aiming at the performance test experiment of the adsorption material under different temperature and steam share conditions, is used for researching the influence of accident conditions on the performance of the adsorption material, and adopts an activated carbon box to absorb gasThe device is not suitable for high-pressure experimental environment, and the measurement method based on the gas radioactive content is harsh.

Therefore, it is necessary to design an experimental system to meet the performance test requirement of the organic iodine adsorption material in the containment filtration and discharge system under a wide range of thermal conditions.

Disclosure of Invention

The invention aims to provide an experimental system for testing the performance of a methyl iodide adsorbing material, which adopts methyl iodide as an organic iodine simulant and has the advantages of simple structure, comprehensive functions and higher safety.

The technical scheme of the invention is as follows:

an experimental system for performing performance test on a methyl iodide adsorbing material comprises an air compressor, a steam supply device, a methyl iodide supply device, a steam-water separation device, an experimental adsorption bed, a control bed, a condenser A, a cooling water tank, a water pump, a condenser B, a steam-water separator A, a steam-water separator B, a gas chromatograph, a data acquisition system and a temperature control system;

the rear part of the air compressor is respectively connected with a steam supply device and a methyl iodide supply device through two branch pipes;

a steam-water separation device is connected behind the steam supply device and the methyl iodide supply device;

two branch pipes, namely a branch pipe A and a branch pipe B, are arranged at the rear end of the steam-water separation device;

the branch pipe A is connected with the experimental adsorption bed and the control bed through a three-way valve A, and the branch pipe B is connected with the condenser A;

the tail ends of the experimental adsorption bed and the control bed are connected with a condenser B through a pipeline and a three-way valve B;

the water pump is respectively connected with the condenser A and the condenser B through a pipeline and valve control;

respectively supplying cooling water in a cooling water tank to a condenser A and a condenser B by starting a water pump;

outlets of the condenser A and the condenser B are respectively connected with inlets of the steam-water separator A and the steam-water separator B through pipelines, and outlets of the steam-water separator A and the steam-water separator B are respectively communicated with the atmosphere and the gas chromatograph through outlet pipelines and valve control;

the data acquisition system is used for acquiring experimental data;

the temperature control system is used for controlling the temperature of the experimental loop to be within the range required by the experimental working condition.

The air compressor provides high-pressure air in the experimental process, one part of the high-pressure air is supplied to the methyl iodide supply device, the other part of the high-pressure air enters the steam supply device, the proportioning relation of different steam and non-condensable gas can be realized under the conditions of different temperatures and pressures, and the high-pressure air compressor is used for simulating multi-component gas before being filtered, which is generated in a containment vessel and is discharged outwards in different time courses after an accident occurs.

Liquid methyl iodide in the methyl iodide supply device is heated and vaporized under constant temperature control, and dry air supplied by an air compressor carries methyl iodide steam to enter a steam-water separation device.

The methyl iodide supply device takes a constant temperature control box as a main body, and a tank body for storing liquid methyl iodide is arranged in the constant temperature control box.

Deionized water is contained in the steam supply device, the temperature and the outlet pressure of the steam supply device are controlled by electric heating, then dry air supplied by an air compressor is introduced, and after the gas flow is stable, the water vapor share can be accurately controlled by controlling the temperature and the outlet pressure of the steam supply device.

The gas inlet pipeline outlet of the steam supply device is provided with the gas-equalizing hole plate and fixed in the liquid phase, so that gas enters the liquid phase in a bubbling mode, the gas-liquid contact area is increased, and the mixed gas with uniform and stable water vapor content can be generated under the condition of stable air outlet pressure.

The size of the gas bubbles can be calculated according to the following formula, the evaporation rate of water is calculated according to the size of the gas bubbles, and the size of the opening of the gas-equalizing hole plate is designed to ensure that the humidity of the gas can reach saturation after the gas bubbles rise to the liquid level;

in the formula (d)_bIs the bubble diameter, m; d_oThe diameter of the opening of the gas-homogenizing hole plate is m; rho is the liquid density, kg/m³(ii) a Sigma is the surface tension of the liquid, N/m; v is the kinematic viscosity m²/s；Q_oIs the orifice gas flow rate, m³S; g is gravity acceleration m/s²。

The main body of the steam supply device is an electric heating boiler and is provided with a temperature sensor and a pressure sensor.

A water storage cavity is designed at the front end of the steam-water separation device, a drain valve is arranged at the bottom of the water storage cavity, hot water is stored in the water storage cavity, incoming flow gas can be preheated, and meanwhile, large liquid drops in the gas can be retained in the water storage cavity;

the steam-water separation device is integrally and obliquely arranged, and the water storage cavity at the front end is arranged below.

The rear end of the steam-water separation device is provided with metal fibers, and micro-nano-scale liquid drops in the gas can be further filtered in a physical interception mode.

The rear end of the steam-water separation device is provided with fixed metal fibers through a hollow flange structure, and the metal fibers are sealed by bolts and can be stacked with multiple layers of metal fibers.

The experimental adsorption bed is filled with target adsorption materials to be tested, and the experimental adsorption bed is controlled to be filled with base materials with the same structural parameters and does not contain any adsorption materials.

The experimental adsorption bed and the control bed are of cylindrical barrel structures, and the side walls of the experimental adsorption bed and the control bed are respectively provided with a thermocouple base and a pressure sampling pipe of a pressure sensor so as to acquire and measure the temperature and the gas pressure of a bed layer in real time and can be used for comparison and verification of adsorption efficiency data.

Before the experiment, whether each instrument is normal or not and whether the instrument is in a verification period are checked, and then a water pump is started to provide cooling water for a condenser A and a condenser B;

then controlling the temperature of the test loop through a temperature control system, and then verifying whether the data acquisition system and the related temperature and pressure measuring instrument display normally or not;

switching a flow path to a control bed by using a three-way valve A, starting an air compressor, a steam supply device and a methyl iodide supply device, adjusting the pressure, the temperature and the steam share of the system to be within the range required by the experimental working condition, measuring the concentration of the methyl iodide before adsorption, and switching the flow path to the experimental adsorption bed;

in the experiment, after the incoming flow gas enters the condenser B, the water vapor in the incoming flow gas is cooled, and the rest gas enters the steam-water separator B and is further dried and then is discharged to the atmosphere through an outlet pipeline;

opening a valve for sampling, introducing part of residual gas into a gas chromatograph, measuring the concentration of methyl iodide in the sample gas after adsorption on line by the gas chromatograph, and comparing the concentration of methyl iodide with the concentration of methyl iodide before adsorption to calculate the adsorption efficiency;

after the experiment is finished, the methyl iodide supply device, the steam supply device, the air compressor, the temperature control system, the data acquisition system and the water pump are sequentially closed.

Is suitable for the environment with the temperature up to 200 ℃ and the pressure of 1 MPa.

The invention has the following remarkable effects:

the invention can test the performance of the methyl iodide adsorbing material to verify the methyl iodide adsorbing effect of the adsorbing material under complex thermal conditions, and the key technical points and innovation points of the invention comprise:

the gas distribution system designed based on the evaporation phenomenon and the Dalton partial pressure law can accurately control the steam share, the system temperature and the pressure, further realize the functions of mixed gas distribution, complex adsorption environment simulation and the like, realize the online measurement of the methyl iodide concentration by the arrangement of the gas pretreatment system, and greatly reduce the experimental error by the design of the double adsorption bed structure.

The invention can realize the performance test of different methyl iodide adsorbing materials under the thermal working conditions of large-scale temperature, pressure and the like, has comprehensive functions, does not need other matching devices and has high measurement precision.

Drawings

FIG. 1 is a schematic diagram of an experimental system.

In the figure: 1. an air compressor; 2. a steam supply device; 3. a methyl iodide supplier; 4. a steam-water separation device; 5. an experimental adsorption bed; 6. controlling the bed; 7. a condenser A; 8. a cooling water tank; 9. a water pump; 10. a condenser B; 11. a steam-water separator A; 12. a steam-water separator B; 13. a gas chromatograph; 14. a data acquisition system; 15. a temperature control system.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

The experimental system for performing the performance test on the methyl iodide adsorbing material shown in fig. 1 is applicable to a high-temperature and high-pressure environment with the temperature of 200 ℃ and the pressure of 1MPa, and comprises an air compressor 1, a steam supply device 2, a methyl iodide supply device 3, a steam-water separation device 4, an experimental adsorption bed 5, a control bed 6, a condenser A7, a cooling water tank 8, a water pump 9, a condenser B10, a steam-water separator A11, a steam-water separator B12, a gas chromatograph 13, a data acquisition system 14 and a temperature control system 15.

And a steam supply device 2 and a methyl iodide supply device 3 are respectively connected with the rear part of the air compressor 1 through two branch pipes.

A steam-water separator 4 is connected to the rear of the steam supply device 2 and the methyl iodide supply device 3. Two branch pipes, namely a branch pipe A and a branch pipe B, are arranged at the rear end of the steam-water separation device 4. The branch pipe A is connected with the experimental adsorption bed 5 and the control bed 6 through a three-way valve A, and the branch pipe B is connected with a condenser A7.

The tail ends of the experimental adsorption bed 5 and the control bed 6 are connected with a condenser B10 through a pipeline and a three-way valve B.

The water pump 9 is respectively connected with the condenser A7 and the condenser B10 through pipelines and valve control. The cooling water in the cooling water tank 8 is supplied to the condenser a7 and the condenser B10 by starting the water pump 9, respectively.

Outlets of the condenser A7 and the condenser B10 are respectively connected with inlets of a steam-water separator A11 and a steam-water separator B12 through pipelines, and outlets of the steam-water separator A11 and the steam-water separator B12 are respectively communicated with the atmosphere and the gas chromatograph 13 through outlet pipelines and valve control. Continuously cooling the water vapor in the sample gas through a condenser A7 and a condenser B10, continuously separating the water in the sample gas through a steam-water separator A11 and a steam-water separator B12 to avoid influencing the measurement peak shape, and finally measuring the methyl iodide concentration in the sample gas after adsorption on line through a gas chromatograph 13 and comparing the methyl iodide concentration with the methyl iodide concentration before adsorption to calculate the adsorption efficiency.

The air compressor 1 provides high-pressure air in the experimental process, one part of the high-pressure air is supplied to the methyl iodide supply device 3, the other part of the high-pressure air enters the steam supply device 2, the proportioning relation of different steam and non-condensable gas can be realized under the conditions of different temperatures and pressures, and the high-pressure air compressor is mainly used for simulating multi-component gas before being filtered, which is generated in a containment vessel and is discharged outwards in different time courses after an accident occurs.

The methyl iodide supply device 3 takes a constant temperature control box as a main body, and a tank body for storing liquid methyl iodide is arranged in the constant temperature control box. Liquid methyl iodide in the methyl iodide supply device 3 is heated and vaporized under constant temperature control, and dry air supplied by the air compressor 1 carries methyl iodide steam to enter the steam-water separation device 4.

The main body of the steam supply device 2 is an electric heating boiler and is provided with temperature and pressure sensors. Deionized water is filled in the steam supply device 2, the temperature and the outlet pressure of the steam supply device 2 are controlled by electric heating, then dry air supplied by the air compressor 1 is introduced, and after the gas flow is stable, the water vapor share can be accurately controlled by controlling the temperature and the outlet pressure of the steam supply device 2.

The gas outlet of the gas inlet pipeline of the steam supply device 2 is provided with a gas-equalizing hole plate and fixed in the liquid phase, so that gas enters the liquid phase in a bubbling mode, the gas-liquid contact area is increased, and the mixed gas with uniform and stable water vapor content can be generated under the condition of stable air outlet pressure. The size of the gas bubbles can be calculated according to the following formula, the evaporation rate of water is calculated according to the size of the gas bubbles, and the size of the opening of the gas-equalizing hole plate is designed to ensure that the humidity of the gas can be saturated after the gas bubbles rise to the liquid level.

In the formula (d)_bIs the bubble diameter, m; d_oThe diameter of the opening of the gas-homogenizing hole plate is m; rho is the liquid density, kg/m³(ii) a Sigma is the surface tension of the liquid, N/m; v is the kinematic viscosity m²/s；Q_oIs the orifice gas flow rate, m³S; g is gravity acceleration m/s²。

The front end of the steam-water separation device 4 is provided with a water storage cavity, hot water is stored in the water storage cavity, incoming air can be preheated, and meanwhile, large liquid drops in the air can be retained in the water storage cavity to remove the large liquid drops in the air. The rear end of the steam-water separation device 4 is provided with metal fibers, and micro-nano-scale liquid drops in the gas can be further filtered in a physical interception mode. The rear end of the steam-water separation device 4 is provided with fixed metal fibers through a hollow flange structure and sealed by bolts, the thickness of a gap is 5mm, and a plurality of layers of metal fibers can be stacked. A drain valve is arranged at the bottom of the water storage cavity at the front end of the steam-water separation device 4. The steam-water separation device 4 is integrally and obliquely arranged, and the front end water storage cavity is arranged at the lower part, so that liquid drops can be converged at the bottom of the water storage cavity after the metal fibers are removed, and the liquid drops are discharged through a drain valve. The structural design of the steam-water separation device 4 can achieve the removal efficiency of micro-nano and larger-sized liquid drops close to 100%.

The experimental adsorption bed 5 and the control bed 6 are cylindrical barrel structures with the diameter of 5mm and the height of 200mm, and the side wall of the experimental adsorption bed are provided with a thermocouple base and a pressure tapping pipe of a pressure sensor so as to measure the bed temperature and the gas pressure. The experimental adsorption bed 5 is filled with target adsorption materials to be tested, and the control bed 6 is filled with base materials with the same structural parameters and does not contain any adsorption materials. The experimental adsorption bed 5 and the control bed 6 are respectively provided with four temperature measuring points and two pressure measuring points, and can be used for collecting and measuring thermal parameters such as temperature, pressure and the like of an experiment in real time. In the experiment, the flow path is firstly switched to the control bed 6 by the three-way valve A, the system pressure, the temperature and the steam share are adjusted, and then the flow path is switched to the experiment adsorption bed 5 to start the experiment. Experiment adsorption bed 5 and control bed 6 are the two bed body structures of symmetrical arrangement, can be used as the contrast verification of adsorption efficiency data to get rid of the influence of base material adsorption performance, can utilize control bed 6 to carry out the operating mode simultaneously and adjust at the experiment initial stage, reduce and adjust and experiment adsorption bed 5 and control bed 6 influence of preheating stage gas flow to the adsorption material performance at initial stage operating mode.

The data acquisition system 14 is used for acquiring experimental data, including air mass flow, steam mass flow, experiment loop inlet pressure temperature, experiment bed pressure temperature, adsorption bed pressure temperature, flow of measurement gas, and methyl iodide concentration.

The temperature control system 15 is used for controlling the temperature of the experimental loop, so that the temperature of the experimental loop is within the range required by experimental working conditions, and the temperature of the steam-water separation device 4, the experimental adsorption bed 5, the control bed 6 and corresponding pipelines is included.

The air compressor 1, the steam supply device 2 and the methyl iodide supply device 3 form a gas distribution system, can realize the matching relationship between different steam and non-condensable gas under the conditions of different temperatures and pressures, and is mainly used for simulating multi-component gas before being filtered, which is generated in a containment vessel and is discharged outwards in different time courses after an accident occurs.

The steam-water separation device 4, the drain valve and the corresponding pipeline form a dehumidification system which is used for removing liquid drops in incoming flow gas and avoiding influencing the performance of the adsorption material.

The experimental bed 5, the control bed 6, corresponding inlet and outlet pipelines and bed temperature and pressure measuring equipment form a system for simulating a methyl iodide adsorption environment.

The condenser A7, the cooling water tank 8, the water pump 9, the condenser B10, the steam-water separator A11, the steam-water separator B12 and related pipeline valves form a gas pretreatment system, and the gas pretreatment system is used for removing water vapor in sample gas for measurement and reducing the measurement error of the gas chromatograph 13. By utilizing a circulating cooling system consisting of the condenser A7, the cooling water tank 8, the water pump 9 and the condenser B10, the water vapor in the sample gas can be continuously cooled, and the water in the gas can be continuously separated by the last steam-water separator A11 and the last steam-water separator B12, so that the influence on the measurement peak type is avoided.

The gas chromatograph 13, the valve and the auxiliary pipeline form a gas concentration measuring system for measuring the concentration of methyl iodide in the sample gas, and the valve and the gas chromatograph 13 are connected in series to realize the function of sampling the sample gas on line.

The data acquisition system 14, the temperature control system 15 and the related temperature and pressure measuring instrument form a temperature control and data acquisition system, which is used for controlling the temperature of each part of the system, maintaining the working condition pressure and temperature and acquiring related data.

Dynamic description of the operation process:

before the experiment, whether each instrument is normal or not and whether the instrument is in a verification period are checked, and then the water pump 9 is started to provide cooling water for the condenser A7 and the condenser B10 to form a circulating cooling system;

then the temperature of the test loop is controlled by the temperature control system 15, and then whether the data acquisition system 14 and the related temperature and pressure measuring instrument display normally is verified;

switching a flow path to a control bed 6 by using a three-way valve A, starting an air compressor 1, a steam supply device 2 and a methyl iodide supply device 3, adjusting the pressure, the temperature and the steam share of the system to be within the range required by the experimental working condition, and measuring to obtain the concentration of methyl iodide before adsorption; switching the flow path to the experimental adsorption bed 5 for experiment to measure the concentration of the adsorbed methyl iodide;

in the experiment, after the incoming gas enters the condenser B10, the water vapor therein is cooled, and the rest gas enters the steam-water separator B12 and is further dried, and then is discharged to the atmosphere through an outlet pipeline;

then opening a valve for sampling, introducing part of the residual gas into the gas chromatograph 13, measuring the methyl iodide concentration in the sample gas after adsorption on line through the gas chromatograph 13, and comparing the methyl iodide concentration with the methyl iodide concentration before adsorption to calculate the adsorption efficiency;

after the experiment is finished, the methyl iodide supply device 3, the steam supply device 2, the air compressor 1, the temperature control system 15, the data acquisition system 14 and the water pump 9 are closed in sequence.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.