CN114295301A - Tracer gas injection device and method - Google Patents
Tracer gas injection device and method Download PDFInfo
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- CN114295301A CN114295301A CN202111411457.8A CN202111411457A CN114295301A CN 114295301 A CN114295301 A CN 114295301A CN 202111411457 A CN202111411457 A CN 202111411457A CN 114295301 A CN114295301 A CN 114295301A
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- 238000002347 injection Methods 0.000 title claims abstract description 98
- 239000007924 injection Substances 0.000 title claims abstract description 98
- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000010998 test method Methods 0.000 claims abstract description 21
- 238000004401 flow injection analysis Methods 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000002955 isolation Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention belongs to the technical field of field tests of the sealing performance of important habitability areas of nuclear facilities, and particularly relates to a tracer gas injection device and a tracer gas injection method. The tracer gas injection device comprises a tracer gas cylinder (1) provided with an injection pipeline (2), wherein a high-precision flow meter (3) is arranged on the injection pipeline (2), and tracer gas in the tracer gas cylinder (1) can be injected into a tested area through the injection pipeline (2) by a set test method under the control of the high-precision flow meter (3). When the concentration attenuation method or the constant flow injection method is adopted to measure the leakage rate in the habitability area of the nuclear power station main control room, the invention can provide accurate control on the injection flow of the tracer gas and meet the measurement requirement.
Description
Technical Field
The invention belongs to the technical field of field tests of the sealing performance of important habitability areas of nuclear facilities, and particularly relates to a tracer gas injection device and a tracer gas injection method.
Background
An important habitability area of a nuclear facility refers to an area in the nuclear facility (e.g., a nuclear power plant) where it is necessary to provide a habitability atmosphere (air temperature, humidity, cleanliness, etc. satisfying the habitability requirements) necessary for the watchmen under abnormal conditions (nuclear leakage, biochemical attack, etc.). Under the abnormal state, the staff guard in the important habitability area can delay or stop the development of the abnormal state of the nuclear facility, and alleviate or eliminate the consequences caused by the abnormal state, so the important habitability area has important significance, especially the main control room habitability area of the nuclear power station, and more important key area in the habitability area.
The leakage rate measurement in a habitability area of a nuclear power station main control room is generally tested by using a tracer gas method, and generally comprises three methods: concentration decay method, constant flow injection method and constant concentration method. The concentration attenuation method is characterized in that after a certain amount of tracer gas is injected into the habitability area of the main control room, the injection is stopped, and the internal leakage rate of the habitability area of the main control room is calculated by testing the change rate of the tracer gas after the concentration is balanced along with the time; the constant flow injection method is characterized in that tracer gas is injected into the habitability area of the main control room at a constant flow, and the inner leakage rate of the habitability area of the main control room is calculated by testing the maximum total equilibrium concentration of the tracer gas in the habitability area of the main control room; the constant concentration method is characterized in that after a certain amount of tracer gas is injected into the habitability area of the main control room, the concentration of the tracer gas in the area is kept constant by adjusting the flow of the tracer gas injected into the habitability area of the main control room, so that the internal leakage rate of the habitability area of the main control room is calculated. Because the constant concentration method has extremely high requirements on the precision and the response speed of the instrument, the engineering is not generally adopted.
When a concentration attenuation method is used for measuring the leakage rate in a habitability area of a nuclear power station main control room, the injection amount of tracer gas needs to be accurately controlled; when the constant flow injection method is used for measuring the leakage rate in the habitability area of the nuclear power station main control room, the injection flow of the tracer gas needs to be accurately controlled.
Disclosure of Invention
The invention aims to provide an automatic tracer gas injection device applied to a leak rate measurement test in a habitability area of a nuclear power station main control room, which can meet the requirement of accurately controlling the injection flow rate of tracer gas when a concentration attenuation method or a constant flow injection method is adopted to measure the leak rate in the habitability area of the nuclear power station main control room.
In order to achieve the above purpose, the technical scheme adopted by the invention is a tracer gas injection device, which comprises a tracer gas cylinder provided with an injection pipeline, wherein the injection pipeline is provided with a high-precision flow meter, and tracer gas in the tracer gas cylinder can be injected into a tested area through the injection pipeline by a set test method under the control of the high-precision flow meter.
Further, the device also comprises a flow controller connected with the high-precision flow meter, wherein the flow controller can control the high-precision flow meter to inject the tracer gas into the tested area according to the set test method; the test method comprises a concentration decay method and a constant flow injection method.
Further, the flow controller is also provided with control software for calculating the free volume, the target concentration, the injection amount and the injection flow of the measured area.
Furthermore, an isolating valve is arranged at the joint of the tracer gas cylinder and the injection pipeline.
Further, a pressure reducing valve is further arranged on the injection pipeline and located between the isolation valve and the high-precision flowmeter.
Further, still include the flatbed, the tracer gas cylinder with flow controller sets up on the flatbed.
In order to achieve the above object, the present invention also discloses a trace gas injection method using the above trace gas injection device, comprising the steps of:
step S1, determining the test method;
step S2, determining the injection mode of the tracer gas, and selecting a quantitative injection mode when the test method is the concentration attenuation method; when the test method is the constant flow injection method, selecting a constant flow injection mode;
step S3, calculating the free volume, the target concentration, the injection amount and the injection flow rate of the measured area by using the control software;
step S4, determining the control mode of the flow controller to the high-precision flow meter according to the injection mode selected in the step S2; inputting the injection amount into the flow controller when the quantitative injection mode is selected; when a fixed flow injection mode is selected, inputting injection flow into the flow controller;
step S5, connecting the injection pipeline with the injection interface of the tested area;
step S6, opening the tracer gas cylinder;
step S7, click "start injection" on the flow controller;
step S8, beginning to inject the trace gas into the detected area;
and step S9, the high-precision flowmeter automatically stops injecting after the injection time of the tracer gas reaches a set value.
Further, after the step S9, the method further includes a step S10 of disconnecting the trace gas injection device from the area under test, removing the trace gas injection device, and placing the site in a safe state.
The invention has the beneficial effects that: when the concentration attenuation method or the constant flow injection method is adopted to measure the leakage rate in the habitability area of the nuclear power station main control room, the accurate control of the injection flow of the tracer gas can be provided, and the measurement requirement is met.
Drawings
FIG. 1 is a schematic view of a trace gas injection apparatus according to an embodiment of the present invention;
in the figure: the device comprises a tracer gas bottle 1, an injection pipeline 2, a high-precision flowmeter 3, a flow controller 4, an isolation valve 5, a pressure reducing valve 6, a flat car 7, an injection interface 8 and a power plug 9.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the tracer gas injection device provided by the invention comprises a tracer gas cylinder 1 provided with an injection pipeline 2, wherein a high-precision flow meter 3 is arranged on the injection pipeline 2, and the tracer gas in the tracer gas cylinder 1 can be injected into a tested area through the injection pipeline 2 by a set test method under the control of the high-precision flow meter 3.
The flow controller 4 is connected with the high-precision flowmeter 3 for data interaction, and the flow controller 4 can control the high-precision flowmeter 3 to inject trace gas into a tested area by a set test method; the test methods include concentration decay method and constant flow injection method.
The flow controller 4 is also provided with control software for calculating the free volume, target concentration, injection amount, injection flow rate, etc. of the measured region.
An isolation valve 5 is arranged at the connection of the tracer gas cylinder 1 and the injection pipeline 2.
A pressure relief valve 6 is also provided on the injection line 2, the pressure relief valve 6 being located between the isolation valve 5 and the high accuracy flow meter 3.
The device also comprises a flat car 7, and the tracer gas cylinder 1 and the flow controller 4 are arranged on the flat car 7.
The invention also discloses a tracer gas injection method adopting the tracer gas injection device, which comprises the following steps:
step S1, determining a test method for leakage measurement of the tested area;
step S2, determining the injection mode of the tracer gas, and selecting a quantitative injection mode when the test method is a concentration attenuation method; when the test method is a constant flow injection method, selecting a constant flow injection mode;
step S3, calculating parameters such as free volume, target concentration, injection amount and injection flow of the measured area by using control software;
step S4, determining the control method of the flow controller 4 for the high-precision flow meter 3 according to the injection method selected in step S2; when the quantitative injection method is selected (the test method is a concentration decay method), the injection amount is input to the flow controller 4; when a constant flow injection mode is selected (the test method is a constant flow injection method), the injection flow is input into the flow controller 4;
step S5, connecting the injection pipeline 2 with the injection interface 8 of the tested area;
step S6, opening the tracer gas cylinder 1;
step S7, click "start injection" on the flow controller 4;
step S8, injecting trace gas into the detected area;
step S9, after the injection time of the tracer gas reaches a set value, the high-precision flowmeter 3 automatically stops injecting;
and step S10, disconnecting the tracer gas injection device from the detected area, detaching the tracer gas injection device, and placing the site in a safe state.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (8)
1. A tracer gas injection device is characterized in that: the device comprises a tracer gas cylinder (1) provided with an injection pipeline (2), wherein a high-precision flow meter (3) is arranged on the injection pipeline (2), and tracer gas in the tracer gas cylinder (1) can be injected into a tested area through the injection pipeline (2) by a set test method under the control of the high-precision flow meter (3).
2. A tracer gas injection device according to claim 1, further comprising: the flow controller (4) is connected with the high-precision flow meter (3), and the flow controller (4) can control the high-precision flow meter (3) to inject the tracer gas into the tested area in the set test method; the test method comprises a concentration decay method and a constant flow injection method.
3. A tracer gas injection device according to claim 2, further comprising: the flow controller (4) is also provided with control software for calculating the free volume, the target concentration, the injection amount and the injection flow of the measured area.
4. A tracer gas injection device according to claim 3, wherein: an isolating valve (5) is arranged at the joint of the tracer gas cylinder (1) and the injection pipeline (2).
5. A tracer gas injection device according to claim 4, wherein: and a pressure reducing valve (6) is further arranged on the injection pipeline (2), and the pressure reducing valve (6) is positioned between the isolation valve (5) and the high-precision flowmeter (3).
6. A tracer gas injection device according to claim 5, wherein: still include flatbed (7), tracer gas cylinder (1) with flow controller (4) set up on flatbed (7).
7. A trace gas injection method using a trace gas injection apparatus as claimed in claim 6, comprising the steps of:
step S1, determining the test method;
step S2, determining the injection mode of the tracer gas, and selecting a quantitative injection mode when the test method is the concentration attenuation method; when the test method is the constant flow injection method, selecting a constant flow injection mode;
step S3, calculating the free volume, the target concentration, the injection amount and the injection flow rate of the measured area by using the control software;
step S4, determining the control mode of the high-precision flowmeter (3) by the flow controller (4) according to the injection mode selected in the step S2; when a quantitative injection mode is selected, the injection amount is input into the flow controller (4); when a fixed flow injection mode is selected, the injection flow is input into the flow controller (4);
step S5, connecting the injection pipeline (2) with an injection interface (8) of the tested area;
step S6, opening the tracer gas cylinder (1);
step S7, clicking 'start injection' on the flow controller (4);
step S8, beginning to inject the trace gas into the detected area;
and step S9, after the injection time of the tracer gas reaches a set value, the high-precision flowmeter (3) automatically stops injecting.
8. A trace gas injection method as claimed in claim 7, wherein: after the step S9, the method further includes a step S10 of disconnecting the trace gas injection device from the area under test, removing the trace gas injection device, and placing the site in a safe state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111411457.8A CN114295301A (en) | 2021-11-25 | 2021-11-25 | Tracer gas injection device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111411457.8A CN114295301A (en) | 2021-11-25 | 2021-11-25 | Tracer gas injection device and method |
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| CN114295301A true CN114295301A (en) | 2022-04-08 |
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| CN202111411457.8A Pending CN114295301A (en) | 2021-11-25 | 2021-11-25 | Tracer gas injection device and method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043200A (en) * | 1988-11-30 | 1990-06-20 | 西屋电气公司 | The quantitative air leak detection system and the method for steam turbine-condenser system |
| KR200191426Y1 (en) * | 2000-02-24 | 2000-08-16 | 주식회사사이언스리서치서비스 | Equipment for leak test with tracer gas |
| CN102288263A (en) * | 2011-07-25 | 2011-12-21 | 中国计量学院 | Device for calibrating gas flow meter in pipeline on line |
| WO2015171821A1 (en) * | 2014-05-06 | 2015-11-12 | The Regents Of The University Of California | Tracer gas airflow measurement system with high turndown ratio |
| CN107132006A (en) * | 2016-02-26 | 2017-09-05 | 中国辐射防护研究院 | Leakage quantity measuring method in a kind of master control room |
| KR101840677B1 (en) * | 2017-02-09 | 2018-03-22 | 한전케이피에스 주식회사 | Leakage rate test equipment of isolation valve and test method thereof |
| CN113375870A (en) * | 2021-05-18 | 2021-09-10 | 国核电站运行服务技术有限公司 | Tracer gas detection method for semiconductor processing equipment |
-
2021
- 2021-11-25 CN CN202111411457.8A patent/CN114295301A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043200A (en) * | 1988-11-30 | 1990-06-20 | 西屋电气公司 | The quantitative air leak detection system and the method for steam turbine-condenser system |
| KR200191426Y1 (en) * | 2000-02-24 | 2000-08-16 | 주식회사사이언스리서치서비스 | Equipment for leak test with tracer gas |
| CN102288263A (en) * | 2011-07-25 | 2011-12-21 | 中国计量学院 | Device for calibrating gas flow meter in pipeline on line |
| WO2015171821A1 (en) * | 2014-05-06 | 2015-11-12 | The Regents Of The University Of California | Tracer gas airflow measurement system with high turndown ratio |
| CN107132006A (en) * | 2016-02-26 | 2017-09-05 | 中国辐射防护研究院 | Leakage quantity measuring method in a kind of master control room |
| KR101840677B1 (en) * | 2017-02-09 | 2018-03-22 | 한전케이피에스 주식회사 | Leakage rate test equipment of isolation valve and test method thereof |
| CN113375870A (en) * | 2021-05-18 | 2021-09-10 | 国核电站运行服务技术有限公司 | Tracer gas detection method for semiconductor processing equipment |
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