JP4064654B2 - Iodine filter performance evaluation apparatus and operation method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an iodine filter performance evaluation apparatus for use in nuclear facilities.
[0002]
[Prior art]
Radioactive iodine released into the air at the time of an accident at a nuclear facility is in the form of iodine gas or methyl iodide, both in the gaseous state. In order not to release it to the public environment, a filter for removing this radioactive iodine, that is, an iodine filter is generally installed in the exhaust system. The iodine filter captures and removes iodine by adsorption, isotope exchange reaction, or chemical reaction, and is generally filled with activated carbon impregnated with iodine in a form such as KI or zeolite impregnated with silver. . Hereinafter, these activated carbons and zeolites are simply referred to as “adsorbents”.
The adsorbent is exposed to the atmosphere or exhaust even at normal times other than the time of the accident, and iodine removal performance deteriorates due to trace components contained therein. For this reason, it is necessary to periodically confirm that the predetermined performance is maintained, and a part of the used adsorbent is taken out and tested.
[0003]
Such an element removal performance test apparatus is as shown in FIG. In this figure, freon is used instead of iodine, but the basic configuration of the apparatus is the same. Since iodine removal performance is affected by temperature, humidity, flow rate, etc., it is indispensable to carry out under test conditions such as determined temperature, humidity, flow rate, etc., but in the apparatus shown in FIG. There was a problem.
(1) Humidity cannot be adjusted because the atmosphere is used as it is, and the humidity is in line with atmospheric conditions.
(2) It takes a considerable amount of time for the amount of Freon (which corresponds to iodine to be described below) to stabilize, but all iodine generated during that period passes through the adsorbent. Accurate evaluation was difficult.
(3) Since the temperature of the test adsorbent is adjusted by input to the heater 129 wound around the duct 101 upstream of the test adsorbent, it is difficult to make fine adjustments and is also affected by the environmental temperature. It was. Further, since the flow rate is slow, the inside of the duct 101 is not sufficiently mixed, and the vicinity of the outer wall around which the heater 129 is wound becomes high in temperature.
(4) In recent years, it has been reported that the iodine removal efficiency deteriorates at lower temperatures, but it has no cooling function and can only perform tests above ambient temperature, making it impossible to test at low temperatures. there were.
[0004]
[Problems to be solved by the invention]
In view of the above problems, the present inventors can perform evaluation under test conditions such as a predetermined temperature, humidity, and flow rate, and can operate with a stable iodine amount. In order to develop a device for evaluating the performance of elementary filters so that the temperature can be adjusted, the temperature unevenness is small, and the humidity can be adjusted.
As a result, for the gas supplied to the specimen, after passing through the filter, the present inventors once branched the gas to perform stable iodine generation and humidification, and mixed them. It has been found that the above problems can be solved by supplying the specimen. The present invention has been completed from such a viewpoint.
[0005]
[Means for Solving the Problems]
That is, according to the present invention, a pre-filter and a particulate filter (HEPA filter: High Efficiency Particulate Air filter) are installed in one system gas flow path, and a gas regulating system is provided downstream of the particulate filter (HEPA filter). The gas flow path is branched into three systems, an iodine generation system, a humidification system, and a bypass system, in the downstream of the gas regulation system, and the three systems are joined again in the mixing system in the downstream of each system. Further, the present invention provides an element filter performance evaluation apparatus that is connected to a downstream sample system as a single gas flow path, and a backup system is installed in the downstream of the sample system.
Here, in the humidification system, a water vapor generating device is installed, and air and water are contacted in a laminar flow in the water vapor generating device to prepare high-humidity air that does not generate water mist, and the water vapor generating device It is preferable to perform air heating in consideration of the latent heat of vaporization upstream and to heat high-humidity air downstream of the water vapor generator to prevent generation of water mist.
Further, in the humidification system, two bubble generation bubble towers with a built-in demister are installed in series, a HEPA filter is provided downstream of the water vapor generation bubble tower, and a heater is provided downstream of the HEPA filter. The aspect provided is also suitable. In that case, it is preferable to install in the thermostatic chamber from the inlet temperature measurement point of the second tower of the second steam generating bubble tower to the specimen system among the steam generating bubble tower.
[0006]
In the present invention, in the mixer body provided in the mixing system, the humidified air from the humidifying system and the inlet of the dry air from the bypass system, and the outlet of the mixed air are respectively different ends, An aspect in which an inflow position of gas containing iodine from the iodine generation system is provided between the inflow port and the outflow port is arranged so as to face in the opposite direction toward the outside of the main body. It is done.
Further, in the iodine generation system, an iodine generation container is installed in a thermostatic bath to maintain a predetermined iodine concentration, and iodine crystals and glass wool are alternately stacked inside the iodine generation container. Thus, an embodiment in which air is passed between the iodine crystals to generate gaseous iodine is preferable. At this time, it is preferable that a line for bypassing the iodine generating container is provided.
[0007]
Further, in the iodine generation system, an iodine generator is installed in a thermostatic chamber together with a part of an air inflow / outflow pipe connected to the generator, and an iodine generation container is provided inside the iodine generator. The iodine generating container preferably has a configuration in which the inside of the upper part is thin and the upper part is opened.
In the apparatus of the present invention, it is preferable that a bypass line is provided in each of the specimen system and the backup system.
[0008]
Further, the present invention allows a gas that has been dehumidified and flow-adjusted through a pre-filter and then passed through a HEPA filter to flow down into three systems, an iodine generation system, a humidification system, and a bypass system, After the three systems of gas are merged again at the above, the operation method of the elementary filter performance evaluation apparatus is provided so that the gas flows into the specimen system and the outflowed gas is further supplied to the downstream backup system. is there.
Here, for example, after circulating the total amount of gas through the bypass system and the bypass line of the specimen system and the bypass line of the backup system, the gas is circulated through the iodine generation system and the humidification system, An operation in which the gas is circulated through the specimen system and the backup system, and after a predetermined time has elapsed, the gas is returned to the bypass line of the specimen system and the backup system, and the gas is circulated again to the bypass system. A method is mentioned. The pressure loss of the bypass line is preferably substantially the same as the pressure loss of the main line of the specimen system or the backup system.
[0009]
In the present invention, when evaluating the iodine filter performance using the iodine filter performance evaluation apparatus described above, the iodine collection efficiency is collected by the specimen system and the backup system. It can be calculated from the elementary amount.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of an iodine filter performance evaluation apparatus and an operation method thereof according to the present invention will be described with reference to the accompanying drawings.
Embodiment (Part 1)
FIG. 1 is a flow sheet according to the present embodiment and shows a basic system.
In the present embodiment, the air is sucked in by the blower 20 through the pre-filter 10, passes through the HEPA filter 30, the gas adjustment system (air adjustment system 40), and enters the iodine generation system 50, the humidification system 60, and the bypass system 70. After being divided into three, they are merged in the mixed system 75, flow into the specimen system 80, and are discharged to the test facility installation building exhaust system (not shown) through the backup system 90. When supplying the mixed gas to the specimen system 80, it flows under the specified test conditions. More specific description will be given below.
[0011]
Dust in the atmosphere is generally removed by the pre-filter 10, the dust load of the HEPA filter 30 installed downstream can be reduced, and the usable period of the HEPA filter 30 can be extended. Since the HEPA filter 30 is more expensive than the pre-filter 10 that is generally called a flat filter or a rough filter, the cost can be reduced by reducing the replacement frequency.
The blower 20 supplies air to be used in this test, and may be a compressor with a pressure regulator instead of the blower.
[0012]
The air sent by the blower 20 is dehumidified and the flow rate is adjusted by the air adjustment system 40, and then divided into three parts to be divided into an iodine generation system 50, a humidification system 60, and a bypass system 60. Since the flow rate is measured and the flow rate is adjusted after dehumidification, the flow rate can be adjusted very accurately without being affected by fluctuations in moisture (water vapor) concentration (humidity).
In the iodine generation system 50, iodine is generated in a prescribed chemical form and concentration, and is placed on the diverted air flow. The humidification system 60 is a system through which most air flows. The iodine generation system 50, the humidification system 60, and the bypass system 70 have temperature and flow rate adjustment functions. By dividing into three systems in this way, it becomes possible to secure an optimal flow rate for iodine generation and humidity adjustment, and it becomes easy to set test conditions, thereby reducing the burden on the operator. Note that the flow rate adjustment function of the bypass system 70 can be replaced by the flow rate adjustment function of the air adjustment system 40.
[0013]
In the mixed system 75, the three gas systems again merge and flow into the specimen system 80 under the specified test conditions. The humidity of the specimen system can be adjusted to a set value by adjusting the flow rate ratio of the humidification system 60 and the bypass system 70 since the gas amount of the iodine generation system 50 is constant.
By providing the mixed system 75, the iodine concentration, temperature, and humidity become uniform, the reliability of the test results is improved, the number of repeated tests can be reduced, the test period and operator working hours can be reduced, and the cost It leads to reduction.
In particular, in the case of an adsorbent that removes iodine using an isotope exchange reaction, radioactive iodine is used as iodine, so that the gas flowing out of the specimen system 80 leaks in the backup system 90. After removing the radioactive iodine coming in, it is released to the test equipment installation building exhaust system.
[0014]
In this case, from the amount of radioactive iodine A collected by the adsorbent tested in the specimen system 80 and the amount of radioactive iodine B adsorbed by the iodine adsorbent installed in the backup system 90, The iodine collection efficiency η is obtained by the following equation.
η = A / (A + B) × 100%
Thus, the backup system 90 is not only necessary for calculating the performance of the test adsorbent (iodine collection efficiency η), but also greatly reducing the amount of radioactivity released from the facility, thereby contributing to the reduction of public exposure. Is.
Even when non-radioactive iodine is used, the iodine collection efficiency η can be obtained in the same manner. There is also a method of sampling the gas before and after the adsorbent and obtaining the iodine collection efficiency η from the iodine concentration in the gas, but from the viewpoint of accuracy and detection limit, compared to the above method It is inferior.
[0015]
Embodiment (2)
FIG. 2 is a cross-sectional view showing the structure of the water vapor generator 63 which is the main device of the humidifying system 60. 2a is a plan view and b is an elevational view.
The air 61 divided into the humidification system 60 flows while turning back along the upper part of the narrow flow path partitioned by the internal partition plate 64 of the water vapor generating device 63. On the other hand, the water 68 whose temperature and flow rate are adjusted flows in a counterflow with the air. Heaters 62 and 66 for heating the incoming air 61 and the outlet air 611 and temperature regulators 65 and 67 for adjusting their temperatures are provided.
[0016]
The shape and dimensions of the flow path are set so that the flow of both air and water is laminar. By flowing in a laminar flow, no water mist is generated here. If water mist is generated and reaches the specimen system 80, it adheres to the surface of the adsorbent, significantly impairs iodine collection performance, and makes it impossible to evaluate true collection performance. For this reason, it is necessary to strictly control the arrival of water mist.
Since the water vapor generator 63 takes away the latent heat of vaporization accompanying the evaporation of water, the temperature of the inflowing air 61 needs to be higher than the set temperature, and an air heater 62 is provided for this purpose. By this heater output, the outlet temperature of the steam generator 63 is adjusted via the temperature controller 65.
[0017]
As described above, since water mist is strictly prohibited to be brought into the specimen system 80, if the water vapor pressure at the outlet of the steam generator 63 is very close to the saturated water vapor pressure, a minute amount is required in the flow path to the specimen system 80. Since there is a risk of generating water mist if there is a low temperature drop or a very low temperature wall part, a heater 66 is installed to avoid this.
As a result, the water mist is not brought into the specimen system 80, the erroneous performance evaluation due to the adhesion of the water mist is eliminated, the reliability is improved, and the test period and cost can be reduced by re-testing.
[0018]
Embodiment (Part 3)
FIG. 3 is a cross-sectional view showing another structure of the water vapor generator 63 which is the main device of the humidifying system 60.
The air 61 divided into the humidification system 60 is first led from the lower part of the first steam generating bubble column 631, passes through the introduced water 68 by adjusting the temperature and flow rate, and the mist mist 641 removes the water mist. Then, after being guided to the lower part of the second tower for generating water vapor 632 and removing water mist by the demister 642, the same procedure as in Example 2 was performed.
As in the second embodiment, the heaters 62 and 66 for heating the inflowing air 61 and the outlet air 611 and the temperature controllers 65 and 67 for adjusting the temperature thereof are provided. A part from the temperature detection end of the temperature controller 65 to the specimen system 80 is installed in the thermostatic chamber 651.
[0019]
In the first bubble generating bubble column 631, it takes away the latent heat of evaporation accompanying the evaporation of water, so the temperature of the inflowing air 61 needs to be higher than the set temperature, and an air heater 62 is installed for that purpose. ing. The outlet temperature of the steam generating bubble column 631 is adjusted via the temperature controller 65 by the output of the heater.
At the outlet of the first steam generation bubble tower 631, there is no need to strictly eliminate water mist, but a demister 641 is installed so that no drain is generated in the pipe to the second tower steam generation bubble tower 632. Yes.
In the first bubble generating bubble column 631, the amount of water evaporated is large, so it is necessary to replenish water at all times to compensate for the evaporated water, and the outlet water amount is kept constant by keeping the temperature constant. In order to do this, water 68 is supplied at a constant flow rate and temperature. This supply amount is larger than the amount of evaporated water, and surplus water that has not been evaporated and consumed flows out by a method of maintaining the water level of the first tower steam generation bubble column 631, such as overflow. Therefore, the evaporation amount of water in the first tower steam generating bubble column 631 is constant, that is, the moisture at the outlet of the first tower steam generating bubble column 631 is constant.
The humidified air exiting the first steam generation bubble column 631 then flows into the second steam generation bubble column 632 having the same structure as the first tower.
[0020]
The relative humidity at the outlet of the bubble tower 631 for generating steam in the first tower has been empirically found to be about 97%. Also, it has been empirically found that the relative humidity at the outlet of the second tower steam generating bubble column 632 is 99% or more.
Therefore, the amount of evaporated water in the second tower for generating water vapor bubble column 632 is very small, and the temperature of the air here hardly changes. The bubble tower 632 for generating the second water vapor after the temperature measuring point of the temperature controller 65 is installed in the thermostatic bath 651 to further suppress the temperature change by eliminating the influence of disturbance. The replenishing water 685 for replenishing the slightly evaporated water in the second tower steam generating bubble column 632 is of course brought to the same temperature as the thermostat 651 and then guided into the thermostat 651 for generating the second tower steam. The bubble column 632 is replenished. In the second bubble generation bubble column 632, since there is almost no temperature change as described above, the makeup water 685 does not need to flow more than the amount of evaporated water in order to maintain the temperature, and overflow is not necessary, but the water level maintaining function (A water level meter and a function for controlling the inflow of makeup water 685 linked to it) are necessary.
[0021]
In the second bubble generating bubble column 632, a demister 642 is provided, and about 98% of the mist is removed, but since it is not completely removed, a mist separator 633 is further provided. The mist separator 633 is filled with a silica wool layer 643 having a sub-μm diameter, or a HEPA filter is installed. Here, more than 99.9% of the mist is removed, and air with a saturation humidity with almost no mist. Become. Further, in order to avoid generation of mist due to a slight temperature drop, the temperature is raised by the heater 66 and controlled to the temperature of the test condition by the temperature regulator 67.
By installing the mixed system 75 and the specimen system 80 in the thermostat 651, the test temperature condition can be accurately set. Although not shown in FIG. 3, the fluids of the iodine generation system 50 and the bypass system 70 that have been adjusted in temperature join in the mixing system 75.
[0022]
Embodiment (part 4)
FIG. 4 is a cross-sectional structure diagram of the mixer of the mixing system 75.
In the mixer main body 751, the humidified air 611 from the humidifying system 60, the air 51 containing iodine from the iodine generating system 50, and the dry air 71 from the bypass system 60 flow in the arrangement shown in FIG. It has a structure with piping through which air 81 flows out.
[0023]
The piping port is opened so that the humidified air 611 from the humidifying system 60 having the highest flow rate is discharged toward one end of the mixer main body 751, and the dry air 71 from the bypass system 60 is also the same. The piping opening of the outflowing mixed air 81 is just facing the opposite side, and the piping opening of the air 51 containing iodine from the iodine generation system 50 is located between them, and the opening direction is humid air. 611 and the direction of the dry air 71 from the bypass system 60.
By adopting this structure, the composition of the outflowing mixed air 81 is mixed and uniform, and even if mist flows in, the streamline faces in the opposite direction, preventing mist from flowing out. Can lead to reliable data acquisition, which in turn reduces the number of tests and reduces costs.
[0024]
Embodiment (Part 5)
FIG. 5 is a system diagram of an iodine generation system 50 for generating single iodine.
In the iodine generating container 52, iodine crystals and glass wool are alternately stacked, and air flows between the iodine crystals. The iodine generating container 52 and the upstream pipe are accommodated in the thermostat 54. A line for bypassing these is also provided.
[0025]
Iodine crystals and glass wool are alternately stacked inside the iodine generation container 52, air is passed between the iodine crystals, iodine is sublimated into a gaseous state, and air 51 containing iodine is entrained in the air. Spill as. By alternately stacking iodine crystals and glass wool, the iodine crystals and the air are sufficiently in contact so that air drift is eliminated, and the vapor pressure of iodine in the contacted air reaches the saturated vapor pressure.
The vapor pressure of iodine is a function of temperature, and the iodine partial pressure in the air 51 containing iodine, that is, the iodine concentration, is set by installing the iodine generation vessel 52 and the upstream pipe inside the thermostatic chamber 54. Can be set.
[0026]
When it is not necessary to flow iodine, that is, from the start-up of the device until the temperature and humidity of the entire device, the flow rate condition is set to the set value, the temperature / humidity retention period specified by the specimen, and the period after the end of the test. Causes air to flow through the bypass line with the valve 57 by operating the valves 55-57. At this time, it goes without saying that the iodine concentration (vapor pressure) in the iodine generating container 52 is determined by the vapor pressure with respect to the temperature of the thermostat 54 and is constant and does not exceed the vapor pressure.
[0027]
Embodiment (No. 6)
FIG. 6 is a system diagram of an iodine generation system 50 for generating methyl iodide.
Methyl iodide is placed inside the iodine (methyl iodide) generation vessel 521. The upper part 522 of the iodine generating container 521 is thin and the upper part is open. The iodine generation container 521 is installed inside the iodine generator 523. The iodine generator 523 is provided with an air inflow / outflow pipe, and is housed in the thermostatic chamber 54 together with the upstream pipe thereof. A line for bypassing these is also provided.
[0028]
Methyl iodide is placed inside the iodine (methyl iodide) generation vessel 521. Methyl iodide has a vapor pressure depending on the temperature, and the vapor pressure is too high near the performance test temperature of the adsorbent. Therefore, if the upper part 522 of the iodine generation container 521 is made thin, the amount of iodine transferred from the iodine generation container 521 to the inside of the iodine generator 523 is controlled by the diffusion speed, diffusion distance, and diffusion area in the upper part 522. Is done. The diffusion rate is determined by the temperature and iodine concentration at the upper end of the upper part 522. Therefore, if the iodine generator 523 is installed in the thermostatic chamber 54 so that the temperature becomes constant, the iodine generator 523 It depends only on the amount of air inflow.
[0029]
Conversely, the amount of air flowing into the iodine generator 523 is determined by the setting conditions of the specimen system 80, so the shape (length and thickness) and temperature of the upper part 522 of the iodine generator 521 must be adjusted. Thus, the iodine concentration from the iodine generating container 521 into the iodine generator 523, that is, the air inflow amount is constant, so that the iodine concentration can be adjusted to a predetermined value.
As in the case of the embodiment (No. 5), when it is not necessary to flow iodine, that is, the period from the start of the apparatus to the temperature and humidity of the entire apparatus and the flow rate conditions set to the set values, and the temperature and humidity determined by the specimen During the holding period and a period such as after the end of the test, air is caused to flow through the bypass line with the valve 57 by operating the valves 55 to 57. At this time, it goes without saying that the iodine concentration (vapor pressure) in the iodine generating container 52 is determined by the vapor pressure with respect to the temperature of the thermostat 54 and is constant and does not exceed the vapor pressure.
[0030]
Embodiment (Part 7)
FIG. 7 is an operation flowchart of the iodine filter performance evaluation apparatus, and FIG. 8 is a system diagram of the specimen system 80 and the backup system 90.
In FIG. 8, the air 751 set as the test condition passes through the test adsorbent 81 and the backup adsorbent 91 and is discharged out of the system and discharged into the test facility building exhaust system. The air flowing during the setting of the test conditions and after the completion of the adsorption test flows through the bypass lines of the respective systems, that is, 84 valve lines and 95 installation lines.
[0031]
The operation procedure of FIG. 7 will be described.
(1) Set the temperature of the system through which air passes and wait for it to settle.
(2) All systems with a bypass line allow air to flow through this line.
(3) Gradually raise the water temperature of the steam generation system to the set value.
(4) Check that the temperature, humidity, and flow rate of each line are set values.
(5) Switch the humidification system (steam generation system) to the main line.
(6) Switch the iodine generation system to the main line.
(7) Switch the specimen system and backup system to the main line.
(8) After a predetermined test time, switch the specimen system and the backup system to the bypass line.
(9) Switch the iodine generation system to the bypass line.
(10) Switch the humidification system (steam generation system) to the bypass line.
(11) End of test [0032]
First, according to (1), by setting the temperature of each part of the apparatus to a predetermined condition, it is possible to prevent overshoot when the fluid is circulated and shorten the settling time. According to (10) of the previous test, the system is in a dry state, and in (2), the state is maintained and temperature is stabilized in a state where fluid (dry air) flows.
If the temperature of the steam generation system is suddenly increased, in the event of overshoot, mist generation is unavoidable when returning to the set value next time, so the temperature of the steam generation system is gradually increased to the set value. .
At first, it is inconvenient to use the bypass line in all systems even if the above phenomenon occurs (the mist jumps to the test adsorbent 81, resulting in underestimation of iodine adsorption performance) Therefore, it is preferable that each system is provided with a bypass line.
[0033]
After that, switch to the main line and switch to the bypass line again after the performance test. This operation eliminates the possibility of water remaining as a liquid in the system, and hence the possibility of mist generation, so that the reliability of the test results can be maintained. These operations can be automatically performed using an electronic computer, a sequencer, or the like.
In addition, the pressure loss of the bypass line is made to be the same as that of the main line, thereby avoiding flow rate fluctuations when switching between the bypass line and the main line.
[0034]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the scope of the present invention. is there.
[0035]
【The invention's effect】
According to the iodine filter performance evaluation apparatus according to the present invention, it is possible to perform evaluation under test conditions such as a predetermined temperature, humidity, and flow velocity, and it is possible to operate with a stable iodine amount and Therefore, it is possible to evaluate the performance of the elementary filter so that the temperature can be adjusted, the temperature unevenness is small, and the humidity can be adjusted.
[Brief description of the drawings]
FIG. 1 is a flow sheet of an embodiment (No. 1), and shows a gas distribution system that is the basis of the present invention.
FIGS. 2A and 2B are cross-sectional views showing an example of the structure of a water vapor generator used in the humidifying system of the present invention, wherein FIG. 2A is a plan view and FIG. 2B is an elevation view.
FIG. 3 is a cross-sectional view showing another example of the water vapor generator used in the humidifying system according to the present invention.
FIG. 4 is a diagram showing an example of a cross-sectional structure of a mixer used in a mixing system according to the present invention.
FIG. 5 is a system diagram including an iodine generating container used in the iodine generating system according to the present invention.
FIG. 6 is a system diagram showing an example of an iodine generation system for generating methyl iodide.
FIG. 7 is an operation flowchart of the iodine filter performance evaluation apparatus of the present invention.
FIG. 8 is a system diagram of a specimen system and a backup system in the present invention.
FIG. 9 is a block diagram showing an example of a conventional iodine removal performance test apparatus.
[Explanation of symbols]
10 Pre-filter 20 Blower 30 H E PA filter 40 Air adjustment system (gas adjustment system)
50 Iodine generation system 60 Humidification system 70 Bypass system 75 Mixing system 80 Specimen system 90 Backup system

Claims (12)

The pre-filter and the fine particle filter are installed in one gas flow path, and a gas adjustment system is provided in the downstream of the fine particle filter. After dehumidification by the gas adjustment system, the flow measurement and the flow adjustment are performed, and the gas The gas flow path is branched into three systems, an iodine generation system, a humidification system, and a bypass system, in the downstream of the adjustment system. An elementary filter performance evaluation apparatus, wherein the gas filter is further connected to a downstream specimen system as one gas flow path, and a backup system is installed in the downstream of the specimen system.   A steam generator is installed in the humidification system, and air and water are contacted in a laminar flow in the steam generator to prepare high-humidity air that does not generate water mist, and upstream of the steam generator. The iodine filter performance evaluation apparatus according to claim 1, wherein air is heated and high-humidity air is heated downstream of the water vapor generator. In the humidifying system, set up a steam generating bubble column with a built-in demister to two towers in series, downstream of the water vapor generating bubble column, provided with a particulate filter, in that it comprises a heater downstream of the particulate filter The iodine filter performance evaluation apparatus according to claim 1, wherein:   4. The water vapor generating bubble column, wherein a point from the inlet temperature measurement point of the second vapor generating bubble column, which is the downstream, to the specimen system is installed in a thermostatic chamber. Iodine filter performance evaluation device.   In the mixer main body provided in the mixing system, the inlet of the humidified air from the humidifying system and the inlet of the dry air from the bypass system, and the outlet of the mixed air are different from each other, and are directed to the outside of the main body. 2. An inflow position of a gas containing iodine from the iodine generation system is provided between the inflow port and the outflow port. The iodine filter performance evaluation apparatus described.   In the iodine generation system, an iodine generation container is installed in a thermostat, and iodine crystals and glass wool are alternately stacked inside the iodine generation container, and the iodine generation container is bypassed. The iodine filter performance evaluation apparatus according to claim 1, wherein a line is provided.   In the iodine generation system, an iodine generator is installed in a thermostatic chamber together with a part of an air inflow / outflow pipe connected to the generator, and an iodine generation container is provided inside the iodine generator. The iodine filter performance evaluation apparatus according to claim 1, wherein the iodine generating container has a thin upper portion and an open upper portion.   The iodine filter performance evaluation apparatus according to claim 1, wherein a bypass line is provided in each of the specimen system and the backup system. After dehumidifying the gas that has passed through the pre-filter after passing through the pre-filter , the flow rate is measured and adjusted, and then divided into three systems, an iodine generation system, a humidification system, and a bypass system, and the mixed system After the three systems of gas are merged again in step 3, the gas flows into the specimen system, and the outflowed gas is further supplied to the back-up backup system. . The total gas amount is circulated through the bypass system, the bypass line of the specimen system and the bypass line of the backup system, and then the gas is circulated through the iodine generation system and the humidification system. The gas is circulated through the backup system, and after a predetermined time has elapsed, the gas is returned to the specimen system and the bypass line of the backup system, and the bypass system again, and the total amount of gas is circulated. The operation method of the iodine filter performance evaluation apparatus of Claim 9 . Pressure loss of the bypass line of the bypass line or the backup system of the specimen strain, as claimed in claim 10, wherein the pressure loss of the main line of each of said specimen grid or said backup system and substantially the same Operation method of elementary filter performance evaluation apparatus. In performing the iodine filter performance evaluation using the iodine filter performance evaluation apparatus according to any one of claims 1 to 8, the iodine collection efficiency is collected by the specimen system and the backup system. A method for evaluating iodine filter performance, comprising calculating from the amount of iodine.

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