CN219245780U - System for collecting Kr-85 in gaseous effluent under high acid condition - Google Patents
System for collecting Kr-85 in gaseous effluent under high acid condition Download PDFInfo
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- CN219245780U CN219245780U CN202223283848.9U CN202223283848U CN219245780U CN 219245780 U CN219245780 U CN 219245780U CN 202223283848 U CN202223283848 U CN 202223283848U CN 219245780 U CN219245780 U CN 219245780U
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Abstract
The utility model relates to a system for collecting Kr-85 in gaseous effluent under high acid conditions. The system for collecting Kr-85 in gaseous effluent under high acid condition is characterized in that an external filter, an acid removal and water removal component, a mass flowmeter, a sampling pump, an activated carbon spiral adsorption column arranged in a cold trap, a rotameter and a plurality of control valves are sequentially connected through pipelines according to the flowing direction of the gaseous effluent, and all pipelines in the system are set to be corrosion-resistant polytetrafluoroethylene tubes, so that the problems of an acid corrosion system and an adsorption column blocked by water can be solved, continuous sampling can be carried out for 24 hours under the low temperature condition, and the sampling volume is not less than 1m 3 Ensuring the preparation effect of the Kr-85 sample,meets the requirement of the subsequent Kr-85 measurement.
Description
Technical Field
The utility model belongs to the technical field of radiation monitoring, and particularly relates to a system for collecting Kr-85 in gaseous effluent under a high-acid condition.
Background
Of the amount of fission products in the spent fuel element of the power stack, krypton represents about 378g/t (U), of which about 93% is nonradioactive krypton and about 1.5% is the fission yield of Kr-85. Most of radioactive gas splinter element krypton and xenon in the spent fuel are released in the element dissolution process and enter dissolution tail gas.
Besides krypton and xenon, the dissolved tail gas also contains a large amount of nitrogen oxides, empty carbon oxides and the like, and the gaseous effluent of the dissolved tail gas is discharged after a series of purification measures, and the Kr-85 in the gaseous effluent is monitored, so that whether the emission condition of the dissolved tail gas is abnormal or not can be reflected, and the overall emission condition of the dissolved tail gas can be comprehensively reflected after continuous collection for 24 hours.
Considering that the melting point of the inert gas krypton is-156 ℃ and the boiling point is-153 ℃, the most preferred method is to adsorb all of the Kr-85 in the gaseous effluent using a cold trap of activated carbon at low temperature if it is desired to adsorb all of the Kr-85 in the gaseous effluent as much as possible. However, the gaseous effluent may contain high concentrations of acid and significant amounts of moisture, and adsorption using low temperature activated carbon cold traps can present problems of acid corrosion and moisture plugging of the adsorption column.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model aims to provide a system for collecting Kr-85 in gaseous effluent under the condition of high acid, solves the problems of an acid corrosion system and adsorption column blockage caused by moisture, and samples for 24 hours continuously under the condition of low temperature, wherein the sampling volume is larger than 1m 3 Ensuring the preparation effect of the Kr-85 sample and meeting the subsequent Kr-85 measurement requirement.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a system for collecting Kr-85 in gaseous effluent under high acid condition comprises an external filter, an acid and water removing component, a mass flowmeter, a sampling pump, an activated carbon spiral adsorption column and a rotameter which are sequentially connected through pipelines according to the flowing direction of the gaseous effluent, wherein:
the gas inlet of the external filter is connected with the inlet interface of the gaseous effluent pipeline;
the acid and water removal component comprises a five-stage organic glass column, wherein the five-stage organic glass column comprises a first-stage deionized water column, a second-stage deionized water column, a color-changing silica gel column, a calcium chloride column and a molecular sieve/color-changing silica gel column which are sequentially connected according to the flowing direction of gaseous effluent;
the activated carbon spiral adsorption column is arranged in the cold trap;
the system further includes a plurality of control valves: the first control valve, the second control valve, the third control valve and the fourth control valve; the first pipeline end of the first control valve is connected with the gas outlet of the external filter, and the second pipeline end of the first control valve is connected with the gas inlet of the first-stage deionized water column; the second control valve and the third control valve are respectively arranged on a gas inlet pipeline and a gas outlet pipeline of the activated carbon spiral adsorption column; the first pipeline end of the fourth control valve is connected with the rotameter, and the second pipeline end of the fourth control valve is connected with the gaseous effluent outlet pipeline interface.
Further, the pipelines are all polytetrafluoroethylene tubes.
Further, the vacuum degree of the sampling pump is not less than-80 kPa.
Further, the shell of the activated carbon spiral adsorption column is made of stainless steel.
Further, 10-24 meshes of activated carbon is arranged in the shell of the activated carbon spiral adsorption column.
Further, the molecular sieve/allochroic silica gel column is filled with molecular sieve and allochroic silica gel.
Further, the first control valve, the second control valve, the third control valve and the fourth control valve are two-way valves.
The beneficial effects of the utility model are as follows: the system for collecting Kr-85 in the gaseous effluent under the high acid condition provided by the utility model is characterized in that an external filter, an acid removal and water removal part, a mass flowmeter, a sampling pump, an activated carbon spiral adsorption column arranged in a cold trap, a rotameter and a plurality of control valves are sequentially connected through pipelines according to the flowing direction of the gaseous effluent, and all pipelines in the system are arranged as corrosion-resistant polytetrafluoroethylene tubes, so that the problems of an acid corrosion system and an adsorption column blocking by water can be solved, continuous sampling can be performed for 24 hours under the low temperature condition, and the sampling volume is not less than 1m 3 Ensuring the preparation effect of the Kr-85 sample and meeting the subsequent Kr-85 measurement requirement.
Drawings
FIG. 1 is a schematic diagram of a system for collecting Kr-85 in gaseous effluent under high acid conditions according to an embodiment of the present utility model.
In the figure, V1-first control valve, V2-second control valve, V3-third control valve, and V4-fourth control valve.
Detailed Description
The technical solutions of the embodiments of the present utility model will be further clearly and completely described below with reference to the accompanying drawings and examples, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other examples obtained by those skilled in the art without making any inventive effort based on the examples in the present utility model are within the scope of protection of the present utility model.
As shown in fig. 1, the system for collecting Kr-85 in gaseous effluent under high acid condition provided by the embodiment of the utility model mainly comprises the following components sequentially connected by pipelines according to the flowing direction of the gaseous effluent: external filter, deacidification dewatering part, mass flowmeter, sampling pump, active carbon spiral adsorption column, rotameter etc..
Wherein the gas inlet of the external filter is connected with the inlet interface of the gaseous effluent pipeline; the external filter is used for removing particulate matters in the gaseous effluent.
The pipelines are all polytetrafluoroethylene tubes.
The acid and water removal component comprises a five-stage organic glass column, wherein the five-stage organic glass column comprises a first-stage deionized water column, a second-stage deionized water column, a color-changing silica gel column, a calcium chloride column and a molecular sieve/color-changing silica gel column which are sequentially connected according to the flowing direction of gaseous effluent;
the first-stage deionized water column and the second-stage deionized water column can be used for dissolving soluble acid gas in gaseous effluent; the allochroic silica gel column can be used for removing moisture in gaseous effluent; the calcium chloride may be used to further remove moisture from the gaseous effluent.
The molecular sieve/allochroic silica gel column is filled with a molecular sieve and a small amount of allochroic silica gel, and the molecular sieve can be used for further removing moisture in gaseous effluent; the small amount of allochroic silica gel can be convenient for observation and judgment whether the molecular sieve needs to be replaced or not.
The vacuum degree of the sampling pump is not less than-80 kPa;
the activated carbon spiral adsorption column is arranged in the cold trap; in a specific embodiment, the cold trap contains liquid nitrogen. The shell of the activated carbon spiral adsorption column is made of stainless steel, and 45g of 10-24 meshes of activated carbon is filled in the shell of the activated carbon spiral adsorption column and is used for adsorbing Kr-85 in gaseous effluent.
The system further includes a plurality of control valves: a first control valve V1, a second control valve V2, a third control valve V3, a fourth control valve V4; the first pipeline end of the first control valve V1 is connected with the gas outlet of the external filter, and the second pipeline end of the first control valve V1 is connected with the gas inlet of the first-stage deionized water column. The first pipeline end of the fourth control valve V4 is connected with the rotameter, and the second pipeline end of the fourth control valve V4 is connected with a gaseous effluent outlet pipeline interface. The second control valve V2 and the third control valve V3 are respectively arranged on a gas inlet pipeline and a gas outlet pipeline of the activated carbon spiral adsorption column and are used as safety valves.
The first control valve V1, the second control valve V2, the third control valve V3, and the fourth control valve V4 are two-way valves.
In this embodiment, there is also provided a method for collecting Kr-85 in a gaseous effluent under high acid conditions, which is carried out based on the system for collecting Kr-85 in a gaseous effluent under high acid conditions, the method comprising the steps of:
s1, preparation before acquisition: verifying the air tightness of the whole system; and drying and activating the activated carbon spiral adsorption column for standby, and placing the activated carbon spiral adsorption column in a cold trap.
Specifically, the air tightness of the whole system is verified in a pressurizing mode, so that the system is ensured to be airtight.
The method for drying and activating the activated carbon spiral adsorption column for standby comprises the following steps: and (3) purging the activated carbon spiral adsorption column by adopting high-purity helium gas to realize drying and activation.
S2, collecting gaseous effluent: setting the mass flowmeter to a desired value; the first control valve V1, the second control valve V2, the third control valve V3 and the fourth control valve V4 are opened, and the sampling pump is closed. And filling liquid nitrogen in the cold trap, opening a sampling pump, opening a fourth control valve V4, and continuously collecting for 24 hours. Liquid nitrogen needs to be added when the liquid nitrogen is not full.
Specifically, the mass flowmeter is set at (0.7-1.0) L/min.
When the cold trap is filled with liquid nitrogen, the sampling pump is turned on after the flow of the mass flowmeter is observed to be 0.
In a specific embodiment, after the sampling pump is turned on, observing the flow rate displayed by the rotameter, and when the rotameter displays a number, slowly opening a part of the fourth control valve V4, so that the fourth control valve V4 cannot be completely opened; after the flow displayed by the mass flowmeter is stable and the flow displayed by the rotameter is stable, the fourth control valve V4 is completely opened, so that the gas is prevented from being sucked back into the activated carbon spiral adsorption column.
S3, ending sampling: firstly, closing the second control valve V2 and the third control valve V3, and then closing the sampling pump and the first control valve V1; taking out half of the activated carbon spiral adsorption column from the cold trap, and slowly opening a third control valve V3; and then taking out the activated carbon spiral adsorption column from the cold trap, opening all the third control valve V3, and closing the third control valve V3 and the fourth control valve V4 after the rotameter indication is 0.
It is to be understood that both the general principles, the principal features, and the advantages of the present utility model are illustrated and described herein. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. The system for collecting Kr-85 in gaseous effluent under high acid condition is characterized by comprising an external filter, an acid and water removing component, a mass flowmeter, a sampling pump, an activated carbon spiral adsorption column and a rotameter which are sequentially connected through pipelines according to the flowing direction of the gaseous effluent, wherein:
the gas inlet of the external filter is connected with the inlet interface of the gaseous effluent pipeline;
the acid and water removal component comprises a five-stage organic glass column, wherein the five-stage organic glass column comprises a first-stage deionized water column, a second-stage deionized water column, a color-changing silica gel column, a calcium chloride column and a molecular sieve/color-changing silica gel column which are sequentially connected according to the flowing direction of gaseous effluent;
the activated carbon spiral adsorption column is arranged in the cold trap;
the system further includes a plurality of control valves: a first control valve (V1), a second control valve (V2), a third control valve (V3), a fourth control valve (V4); the first pipeline end of the first control valve (V1) is connected with the gas outlet of the external filter, and the second pipeline end of the first control valve (V1) is connected with the gas inlet of the first-stage deionized water column; the second control valve (V2) and the third control valve (V3) are respectively arranged on a gas inlet pipeline and a gas outlet pipeline of the activated carbon spiral adsorption column; the first pipeline end of the fourth control valve (V4) is connected with the rotameter, and the second pipeline end of the fourth control valve (V4) is connected with the gaseous effluent outlet pipeline interface.
2. A system for collecting Kr-85 in a gaseous effluent under high acid conditions as claimed in claim 1, wherein: the pipelines are all polytetrafluoroethylene tubes.
3. A system for collecting Kr-85 in a gaseous effluent under high acid conditions as claimed in claim 1, wherein: the vacuum degree of the sampling pump is not less than-80 kPa.
4. A system for collecting Kr-85 in a gaseous effluent under high acid conditions as claimed in claim 1, wherein: the shell of the activated carbon spiral adsorption column is made of stainless steel.
5. A system for collecting Kr-85 in a gaseous effluent under high acid conditions as claimed in claim 1, wherein: the shell of the activated carbon spiral adsorption column is filled with 10-24 meshes of activated carbon.
6. A system for collecting Kr-85 in a gaseous effluent under high acid conditions as claimed in claim 1, wherein: the molecular sieve/allochroic silica gel column is filled with molecular sieve and allochroic silica gel.
7. A system for collecting Kr-85 in a gaseous effluent under high acid conditions as claimed in any one of claims 1 to 6, wherein: the first control valve (V1), the second control valve (V2), the third control valve (V3) and the fourth control valve (V4) are two-way valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223283848.9U CN219245780U (en) | 2022-12-07 | 2022-12-07 | System for collecting Kr-85 in gaseous effluent under high acid condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223283848.9U CN219245780U (en) | 2022-12-07 | 2022-12-07 | System for collecting Kr-85 in gaseous effluent under high acid condition |
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| CN219245780U true CN219245780U (en) | 2023-06-23 |
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| CN202223283848.9U Active CN219245780U (en) | 2022-12-07 | 2022-12-07 | System for collecting Kr-85 in gaseous effluent under high acid condition |
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| CN (1) | CN219245780U (en) |
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