CN209880176U - System for tritium removal from high humidity air - Google Patents
System for tritium removal from high humidity air Download PDFInfo
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- CN209880176U CN209880176U CN201920536419.7U CN201920536419U CN209880176U CN 209880176 U CN209880176 U CN 209880176U CN 201920536419 U CN201920536419 U CN 201920536419U CN 209880176 U CN209880176 U CN 209880176U
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Abstract
The utility model discloses a system for be used for high humid air to remove tritium, include: the tritium removing unit comprises a gas booster pump, a flow controller, an inner pipe of a drying pipe, a catalytic reactor, an adsorber and a dew-point instrument which are sequentially connected through pipelines; the water collecting unit comprises a rotor flow meter, an outer sleeve of a drying pipe and a water collector which are sequentially connected with the outlet of the absorber; the tritium-containing air containing more moisture enters the tritium removing unit, is discharged after sequentially passing through a gas booster pump, a flow controller, an inner pipe of a drying pipe, a catalytic reactor, an absorber and a dew-point instrument, and the field air discharged from the outlet of the absorber is collected after sequentially passing through a rotor flow meter, an outer sleeve of the drying pipe and a water collector. The utility model adopts tritium-oxygen catalysis and gas-liquid separation technology to realize the on-site cleaning of tritium; under the condition of high-humidity background air, the tritium component in the high-humidity air can be removed in time, and the tritium-involved environment is effectively protected.
Description
Technical Field
The utility model belongs to the technical field of radioactivity "three wastes" administer, concretely relates to a system for high humid air removes tritium. The system can be applied to high-humidity air tritium removal occasions, and can timely remove tritium components in high-humidity air, so that the tritium-involved environment is effectively protected.
Background
Tritium is the only radioactive isotope of hydrogen, the maximum energy of beta rays emitted by the decay of tritium is 18.6keV, and the average energy is 5.65 keV. Tritium may cause corrosion of the containment material or degradation of the material properties (embrittlement, aging). Moreover, tritium can also enter human body through inhalation, ingestion and permeation through intact skin, and is absorbed by human tissue and subject to internal radiation damage. The removal of high-concentration tritium in gas is realized by adopting a catalytic oxidation method.
The tritium removing technology of the high-humidity air adopted by the utility model combines the catalytic oxidation tritium removing technology, the gas drying technology and the gas cleaning technology, and the catalytic oxidation tritium removing technology is adopted to convert all tritium in the tritium into tritiated water; the gas-water separation in the airflow is realized efficiently by adopting a drying tube drying technology; and (3) cleaning water vapor in the air flow by adopting a gas bubbling technology, and collecting the tritium component in the air flow to the greatest extent, thereby realizing high-efficiency radon-tritium separation and environmental protection.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve the problem of tritium removal in a tritium-involving environment and to provide at least the advantages that will be explained later.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a system for tritium removal from high humidity air, comprising:
the tritium removing unit comprises a gas booster pump, a flow controller, an inner pipe of a drying pipe, a catalytic reactor, an adsorber and a dew-point instrument which are sequentially connected through pipelines;
the water collecting unit comprises a rotor flow meter, an outer sleeve of a drying pipe and a water collector which are sequentially connected with the outlet of the absorber;
the tritium-containing air containing more moisture enters the tritium removing unit, is discharged after sequentially passing through a gas booster pump, a flow controller, an inner pipe of a drying pipe, a catalytic reactor, an absorber and a dew-point instrument, and the field air discharged from the outlet of the absorber is collected after sequentially passing through a rotor flow meter, an outer sleeve of the drying pipe and a water collector.
Preferably, the catalytic reactor is a stainless steel pipe with the inner diameter DN150mm multiplied by 1200mm, and the catalyst is filled in the catalytic reactor; the catalyst is Al plated with 1% Pd2O3。
Preferably, an electric heating rod is arranged in the catalytic reactor; an aluminum silicate fiber heat-insulating layer is arranged outside the catalytic reactor; an armored thermocouple is inserted in the catalytic reactor.
Preferably, the drying tube is a stainless steel outer sleeve type drying tube, tritium water from ambient air is transferred to an outer sleeve of the drying tube by an inner tube of the drying tube, and the gas output from the inner tube is only dry tritium-containing gas.
Preferably, the inlet of the flow controller is connected to the gas outlet of the gas booster pump through a pipeline, and the outlet of the flow controller is connected to the inlet of the inner pipe of the drying pipe through a pipeline; the inlet of the water collector is connected with the outlet of the outer sleeve of the drying tube through a pipeline.
Preferably, the outlet of the adsorber is connected with a three-way pipe, the first outlet of the three-way pipe is connected with a discharge pipeline, and the discharge pipeline is connected with a dew point instrument; and a second outlet of the three-way pipe is connected with a rotor flow meter.
Preferably, a first stop valve is arranged on a pipeline connecting the inner pipe of the drying pipe and the catalytic reactor; a second stop valve and a third stop valve are arranged on a pipeline connecting the catalytic reactor and the adsorber; a fourth stop valve is arranged on a pipeline connecting the adsorber and the three-way pipe; a fifth stop valve is arranged on a pipeline at the tail end of the tritium removal unit; and a sixth stop valve is arranged on the pipeline at the tail end of the water collecting unit.
Preferably, the gas booster pump further comprises a gas filter connected to the pipe and located upstream of the gas booster pump.
The utility model discloses at least, include following beneficial effect: the utility model adopts tritium-oxygen catalysis and gas-liquid separation technology to realize the on-site cleaning of tritium; the tritium removing device has the advantages that the electric control technology is adopted for automatic control, manual intervention is reduced, tritium removing efficiency is improved, working quality is guaranteed, tritium components in high-humidity air can be removed in time under the condition of high-humidity background air, and effective protection of a tritium-involved environment is achieved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the high humidity air tritium removal system of the present invention;
FIG. 2 is a schematic diagram of a test system.
The specific implementation mode is as follows:
the present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Fig. 1 shows a system for tritium removal from highly humid air according to the present invention, comprising:
the tritium removing unit comprises a gas booster pump 3, a flow controller 4, an inner pipe of a drying pipe 5, a catalytic reactor 8, an absorber 11 and a dew-point instrument 14 which are sequentially connected through pipelines;
the water collecting unit comprises a rotor flow meter 13, an outer sleeve of the drying tube 5 and a water collector 6 which are sequentially connected with the outlet of the absorber 11;
wherein, tritium-containing air containing more moisture enters the tritium removing unit from the gas inlet 1, and is discharged after passing through a pump (gas booster pump 3), a gas flow controller (flow controller 4), atmosphere drying (inner tube of the drying tube 5), catalytic oxidation (catalytic reactor 8), water vapor absorption (adsorber 11) and dryness measurement (dew point instrument 14) in sequence, and on-site air discharged from the outlet of the adsorber 11 is collected after passing through a rotor flow meter 13, an outer sleeve of the drying tube 5 and a water collector 6 in sequence in the other path.
In the technical scheme, the principle of tritium removal of high-humidity air is that an air gas sample containing more water vapor and tritium is used as the power for gas flow by a gas booster pump, water is removed forcibly through an inner tube of a drying tube, tritium gas is fully oxidized to form tritium water, an adsorber fully absorbs the tritium water, dryness of gas at a dew point instrument monitoring terminal is monitored, and the tritium water is discharged from a pipeline, and the moisture in the air separated out from the drying tube is collected into a water collector by another auxiliary loop (water collection unit), the pressure of the system after the main path is dried is used as the power for gas flowing, and the water vapor of the outer sleeve of the drying tube is forced to be brought into the water collector to be collected through the display control of the rotor flow meter and then is conveyed to the discharge pipeline through the carrier gas.
In the technical scheme, the catalytic reactor is a stainless steel pipe with the inner diameter DN150mm multiplied by 1200mm, and is filled with a catalyst; the catalyst is Al plated with 1% Pd2O3(ii) a The catalyst is used for converting gaseous tritium into liquid tritium by catalytic oxidation, and the conversion efficiency can reach more than 99%.
In the technical scheme, an electric heating rod is arranged in the catalytic reactor; an aluminum silicate fiber heat-insulating layer is arranged outside the catalytic reactor; an armored thermocouple is inserted in the catalytic reactor; considering the long-term use of the catalyst of the system, the regeneration condition of the catalyst needs to be provided, namely a matched electric heating furnace needs to be configured, a rod type internal heating mode is adopted, the insulation resistance is more than 5 MOmega, and the heating power is about 1.5 kw; the center in the catalytic tube is inserted with an armored thermocouple, so that the working temperature of the catalyst is convenient to measure and control, and the working temperature of the catalytic reactor is automatically controlled by a temperature controller; the heating is mainly to prevent the catalyst surface from covering a water film to influence the catalytic efficiency, so the heating temperature of the center of the catalyst is only required to be maintained at about 100 ℃.
In the above technical solution, the drying tube 5 is a stainless steel jacket type drying tube, which is a PD-200 stainless steel jacket type drying tube manufactured by bopure corporation of america; the inner tube of the drying tube transfers tritium water from the catalytic reactor to the outer sleeve of the drying tube, and the gas output from the inner tube is dry gas without water.
In the above technical solution, the inlet of the flow controller 4 is connected to the gas outlet of the gas booster pump 3 through a pipeline, and the outlet of the flow controller 4 is connected to the inlet of the inner pipe of the drying pipe 5 through a pipeline; after the gas is dried by the drying tube, the water content of the gas is extremely low, and the gas coming out of the inner tube of the drying tube 5 can be used as back flushing gas to take away water vapor in the outer sleeve of the drying tube;
the front end of the water collector 6 is connected with an outer sleeve outlet of the drying pipe 5 and the rotameter 13; the outlet of the water collector is connected to the discharge pipe of the system through a pipe; in this way, the gas flow speed in the pipeline is controlled by the rotameter, and the gas pressure of the main path is used as the power for the gas flow of the auxiliary system; the water vapor of the outer sleeve of the drying tube is sent into the water collector for collection, the condenser is arranged outside the water collector in advance, the moisture in the background air is collected efficiently, and the catalytic efficiency and the service life of the catalytic reactor are effectively improved.
In the technical scheme, the outlet of the adsorber 11 is connected with a three-way pipe, the first outlet of the three-way pipe is connected with a discharge pipeline, and the discharge pipeline is connected with a dew point instrument 14; and the second outlet of the three-way pipe is connected with a rotor flow meter 13.
In the technical scheme, a first stop valve 7 is arranged on a pipeline connecting an inner pipe of the drying pipe and the catalytic reactor; a second stop valve 8 and a third stop valve 9 are arranged on a pipeline connecting the catalytic reactor and the adsorber; a fourth stop valve 12 is arranged on a pipeline connecting the adsorber 11 and the three-way pipe; a fifth stop valve 15 is arranged on a pipeline at the tail end of the tritium removal unit; a sixth stop valve 16 is arranged on the pipeline at the tail end of the water collecting unit.
In the technical scheme, the device also comprises a gas filter which is connected to the pipeline and is positioned at the upstream of the gas booster pump, and a gas inlet of the booster pump is connected with an outlet of the gas filter; the gas outlet of the booster pump is connected with the inlet of the flow controller; the power is used as the power of the gas flow of the main tritium removal system; the gas booster pump adopts GWSPC series oilless vortex vacuum compressor produced by Shenyang Jiwei application technology company Limited; the filter is used for filtering dust in air, and the service life of the booster pump is effectively prolonged.
In the utility model, tritium is cleaned in situ by adopting tritium-oxygen catalysis and gas-liquid separation technology; the working temperature of the catalytic reactor is controlled by the temperature controller, so that manual intervention is reduced, tritium removal efficiency is improved, working quality is guaranteed, tritium components in high-humidity air can be removed in time under the condition of high-humidity background air, and the tritium-involved environment is effectively protected.
It is right below respectively the utility model discloses a high humid air removes efficiency of catalytic reactor and drying tube of tritium system and tests:
catalytic efficiency testing of the catalytic reactor:
will be provided with 103The HT gas container with Bq/L magnitude is connected in series in front of an electric heating furnace with a built-in catalytic reactor, the effective volume of the container is 1L, the electric heating furnace can continuously heat the catalytic reactor, room air is used as flushing gas, the flow is controlled to be 1L/min, the carried HT enters the catalytic reactor to be catalyzed into HTO, and enters a bubbler after passing through a drying tube to be collected by bubbling liquid. Filling 30mL of purified water bubbling liquid in the bubbler, operating for 60min, stopping the bubbler, taking 1mL of the bubbling liquid, and measuring by using a liquid scintillation analyzer to calculate the catalytic efficiency, wherein the table 1 shows the test result of the catalytic efficiency;
TABLE 1
As can be seen from Table 1, the catalytic efficiency of the catalyst at room temperature (20 ℃) was 32%, and when the catalyst was heated to 50 ℃, the catalytic efficiency reached 95%, which began to rise. At 100 deg.C, the catalytic efficiency is close to 100%, so that the catalytic temperature is preferably controlled in the range of 50-110 deg.C.
Testing the separation performance of tritium vapor in a drying tube:
the principle of the test system is shown in FIG. 2, wherein 50mL of tritium water is added into a bubbler 111, argon is introduced from a gas carrying tank 116, and relative humidity is generated at room temperature of 20 ℃ by bubblingTritiated water vapor with concentration of 90-98% as experimental gas source, and tritium concentration value of the tritiated water vapor is stabilized at 1.6 × 106Bq/m3. Introducing tritiated vapor into a drying tube 112, controlling the flow rate to be 1L/min by a flow meter 115, connecting an outlet of the drying tube to a No. 1 ionization chamber 113, introducing the measured gas into a drying tube flushing gas circuit, taking away the vapor penetrating through the tube wall, and connecting an outlet of the drying tube flushing gas circuit to a No. 2 ionization chamber 114 for tritiated vapor monitoring to serve as comparison; table 2 shows the drying tube separation Performance test (Bq/m)3)
TABLE 2
| Serial number | Test time (min) | 2# ionization chamber | 1# ionization chamber |
| 1 | 0 | 1.6×105 | 1.62×105 |
| 2 | 20 | 7.4×105 | 1.63×105 |
| 3 | 40 | 9.7×105 | 1.58×105 |
| 4 | 60 | 1.1×106 | 1.49×105 |
| 5 | 120 | 1.1×106 | 1.61×105 |
The test result shows that the drying tube has better tritium water vapor separation effect.
It can also be seen from table 2 that tritiated water vapor cannot reach the outlet of the tube in the drying tube, and the reading of the ionization chamber # 1 is always at the background level within 60min, which indicates that no tritiated water vapor exists at the outlet of the tube in the drying tube.
Testing tritium permeation performance of a drying tube:
as shown in FIG. 2, the bubbler was not charged with the bubbling liquid, and the sampling flow rate was 1L/min. Argon is used as a flushing gas of the drying tube, the flow is controlled to be 1L/min, the test time is 140min, and the results are shown in the table 3 for tritium permeability test (Bq/m) of the drying tube3)；
TABLE 3
Test results show that in the drying tube flushing air flow, the concentration of tritium does not exceed the background, and HT cannot pass through the inner tube of the drying tube.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (8)
1. A system for high humidity air tritium removal, comprising:
the tritium removing unit comprises a gas booster pump, a flow controller, an inner pipe of a drying pipe, a catalytic reactor, an adsorber and a dew-point instrument which are sequentially connected through pipelines;
the water collecting unit comprises a rotor flow meter, an outer sleeve of a drying pipe and a water collector which are sequentially connected with the outlet of the absorber;
the tritium-containing air containing more moisture enters the tritium removing unit, is discharged after sequentially passing through a gas booster pump, a flow controller, an inner pipe of a drying pipe, a catalytic reactor, an absorber and a dew-point instrument, and the field air discharged from the outlet of the absorber is collected after sequentially passing through a rotor flow meter, an outer sleeve of the drying pipe and a water collector.
2. A system for high humidity air tritiation removal as claimed in claim 1, wherein the catalytic reactor is a stainless steel tube with an internal diameter DN150mm x 1200mm, with catalyst inside.
3. A system for high humidity air tritiation removal according to claim 2, characterized in that an electrical heating rod is provided inside the catalytic reactor; an aluminum silicate fiber heat-insulating layer is arranged outside the catalytic reactor; an armored thermocouple is inserted in the catalytic reactor.
4. A system for tritium removal from highly humid air as claimed in claim 1 wherein the drying tube is a stainless steel outer jacket type drying tube with an inner tube that migrates tritium water from ambient air to the outer jacket of the drying tube and the only gas output from the inner tube is dry tritium containing gas.
5. A system for high humidity air tritiation removal according to claim 1,
the inlet of the flow controller is connected with the gas outlet of the gas booster pump through a pipeline, and the outlet of the flow controller is connected with the inlet of the inner pipe of the drying pipe through a pipeline;
the inlet of the water collector is connected with the outlet of the outer sleeve of the drying tube through a pipeline.
6. A system for high humidity air tritiation removal according to claim 1,
the outlet of the adsorber is connected with a three-way pipe, the first outlet of the three-way pipe is connected with a discharge pipeline, and a dew point instrument is connected on the discharge pipeline; and a second outlet of the three-way pipe is connected with a rotor flow meter.
7. A system for high humidity air detritiation as claimed in claim 6, wherein the conduit connecting the inner tube of the drying tube with the catalytic reactor is provided with a first shut-off valve; a second stop valve and a third stop valve are arranged on a pipeline connecting the catalytic reactor and the adsorber; a fourth stop valve is arranged on a pipeline connecting the adsorber and the three-way pipe; a fifth stop valve is arranged on a pipeline at the tail end of the tritium removal unit; and a sixth stop valve is arranged on the pipeline at the tail end of the water collecting unit.
8. A system for high humidity air detritiation as in claim 1 further comprising a gas filter connected to the conduit and located upstream of the gas booster pump.
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| CN201920536419.7U CN209880176U (en) | 2019-04-19 | 2019-04-19 | System for tritium removal from high humidity air |
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| CN201920536419.7U CN209880176U (en) | 2019-04-19 | 2019-04-19 | System for tritium removal from high humidity air |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109887632A (en) * | 2019-04-19 | 2019-06-14 | 江油联合氚碳仪器有限责任公司 | System for highly humid air detritiation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109887632A (en) * | 2019-04-19 | 2019-06-14 | 江油联合氚碳仪器有限责任公司 | System for highly humid air detritiation |
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