CN107702950B - Working method of iodine sampler - Google Patents

Working method of iodine sampler Download PDF

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Publication number
CN107702950B
CN107702950B CN201710772774.XA CN201710772774A CN107702950B CN 107702950 B CN107702950 B CN 107702950B CN 201710772774 A CN201710772774 A CN 201710772774A CN 107702950 B CN107702950 B CN 107702950B
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valve
iodine
pipeline
flow
opening
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CN107702950A (en
Inventor
程翀
许浒
王益元
颜伏伍
卢炽华
邹斌
郭晓彬
陈祥磊
廖武
万新峰
蔺常勇
袁泉
冯昊文
余升林
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Wuhan University of Technology WUT
719th Research Institute of CSIC
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Wuhan University of Technology WUT
719th Research Institute of CSIC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2273—Atmospheric sampling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/167—Measuring radioactive content of objects, e.g. contamination

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Molecular Biology (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Immunology (AREA)
  • Combustion & Propulsion (AREA)
  • Biomedical Technology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measurement Of Radiation (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention belongs to the technical field of nuclear radiation protection, and provides an iodine sampler and a working method thereof. The method of the invention enables the gas flow flowing through the iodine box to accord with the set value by adjusting the opening degree of the first valve and the second valve. The invention can effectively improve the measurement precision.

Description

Working method of iodine sampler
Technical Field
The invention belongs to the technical field of nuclear radiation protection, and particularly relates to a working method of an iodine sampler.
Background
With the development of the technology, the application of nuclear technology is more and more extensive in the global scope, the number of nuclear power stations and nuclear equipment is increased year by year, and the detection of radioactive nuclides in the atmosphere is more and more important in life. In order to achieve the purpose of detection, the radiation in the environment must be sampled, so that it is important to adopt which method to accurately collect and obtain the content of the radiation in the atmosphere.
At present, a commonly used iodine sampler structure is shown in fig. 1, and includes a housing 10, an iodine box 11, a first pipeline 15, a valve 13, an air blower 14, and a second pipeline 12, after the air blower 14 sucks air, a certain flow of air enters the iodine box 11 from the second pipeline 12 below the iodine box, and the rest enters the first pipeline 15, an opening is formed in the upper portion of the housing 10, and a filter paper for collecting aerosol is arranged at the opening. The conventional iodine sampler calculates whether radioactive substances in the atmosphere exceed standards or not according to the measured gas flow volume flowing through the iodine box and the measured iodine content in the iodine box. Therefore, it is critical whether the volume of gas flow through the iodine box can be accurately measured.
In the prior art, the valve 13 connected to the second pipeline 12 below the iodine box is a manual valve, and needs to be opened and closed manually, which is troublesome. The first pipeline 15 is not provided with a valve, and the diameter of the pipeline is larger, so that the pressure in the second pipeline 12 below the iodine box is larger, particularly, the condition is more obvious when the air inflow is large, and the air pressure in the two pipelines is different, so that the flow passing through the iodine box is smaller and cannot reach a flow set value, and the concentration of iodine in the atmosphere cannot be accurately calculated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a working method of an iodine sampler, can effectively solve the problem of inaccurate atmospheric radiometer concentration measurement of the existing iodine sampler due to the fact that the air pressure of a pipeline below an iodine box is larger than that of an air inlet pipeline on the other side, and improves the measurement accuracy.
The purpose of the invention is realized by the following technical scheme.
The working method of the iodine sampler comprises a shell, an iodine box, a first pipeline, a first valve, a first flowmeter, a second pipeline, a second valve, a second flowmeter and an air blower, wherein an opening above the shell is communicated with the outside atmosphere, filter paper used for collecting aerosol is arranged at the opening of the shell, one end of the first pipeline is communicated with the air blower, the other end of the first pipeline extends into the shell, the first valve is arranged on the first pipeline, the first flowmeter is arranged at the first valve, one end of the second pipeline is communicated with the air blower, the other end of the second pipeline extends into the shell and is connected with the iodine box, the second valve is arranged on the second pipeline, the second flowmeter is arranged at the second valve, and the working method of the iodine sampler comprises the following steps:
(1) in the initial state, a flow value I through the iodine box is set0Starting the air blower, wherein the air blower keeps fixed air inlet amount, the upper limit of the opening degree of the first valve and the lower limit of the opening degree of the second valve; wherein the desired set value I0For artificially set target values, e.g. the flow through the iodine box is now expected to be 50, then I0=50；
(2) The second flow meter records the instantaneous flow I through the second valve2The first flowmeter records the instantaneous flow I of the first valve1Total flow I in the two ducts because the blower maintains a fixed air intakeGeneral assemblyConstant, IGeneral assembly= I1+ I2In this state, the flow rate through the iodine box is changed and regulatedRegulating the opening of the second valve from a lower limit to an upper limit, during which the instantaneous flow I, as recorded by the second flowmeter2Has reached the desired set point I0I.e. when I2= I0When the control is finished, stopping the control and keeping running;
(3) if the upper limit of the second valve opening still does not reach the required set value I0Stopping the control of the second valve, changing the opening of the first valve, increasing the pressure in the first pipe, and the total flow I’ General assemblyThe rotation speed of the blower is adjusted to make the total flow in the pipeline reach the previous total flow value I’ General assembly= IGeneral assemblyContinuously changing the opening of the first valve, adjusting the rotation speed of the blower and keeping I’ General assembly=IGeneral assemblyAdjusting the reading of the second flowmeter to a desired set value, I2= I0Until then, the operation is finished and the operation is kept;
(4) the collected aerosol is attached to the filter paper above the shell, the collected iodine is attached to the iodine box, and the flow rate is set according to the flow rate set value I0The concentration of the radioactive substance in the atmosphere at this time is calculated.
The working method of the iodine sampler can adjust the flow passing through the iodine box under the fixed total flow volume, effectively solves the problem of inaccurate atmospheric radiometer concentration measurement of the existing iodine sampler due to the fact that the air pressure of a pipeline below the iodine box is larger than that of an air inlet pipeline on the other side, and improves the measurement accuracy through accurate control of the flow.
Drawings
FIG. 1 is a schematic diagram of a prior art iodine sampler.
Wherein: the device comprises a shell 10, an iodine box 11, a second pipeline 12, a valve 13, a blower 14 and a first pipeline 15.
FIG. 2 is a schematic diagram of the structure of the iodine sampler of the present invention.
Wherein: the iodine box comprises a shell 1, an iodine box 2, a second pipeline 3, a second valve 4, a second flowmeter 5, a blower 6, a first valve 7, a first flowmeter 8 and a first pipeline 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 2, an embodiment of the present invention provides an iodine sampler, including a housing 1, an iodine box 2, a first pipeline 9, a first valve 7, a first flow meter 8, a second pipeline 3, a second valve 4, a second flow meter 5, and a blower 6, wherein an opening above the housing 1 is communicated with the outside atmosphere, a filter paper for collecting aerosol is disposed at the opening of the housing, one end of the first pipeline 9 is communicated with the blower 6, and the other end extends into the housing 1, the first pipeline 9 is provided with the first valve 7, the first valve 7 is provided with the first flow meter 8, one end of the second pipeline 3 is communicated with the blower 6, and the other end extends into the housing 1 and is connected with the iodine box 2, the second pipeline 3 is provided with the second valve 4, and the second flow meter 5 is disposed at the second valve 4.
The embodiment further provides a working method of the iodine sampler, which comprises the following steps:
(1) in the initial state, a flow value I through the iodine box 2 is set0Starting the blower 6, keeping the fixed air intake quantity, the upper opening limit of the first valve 7 and the lower opening limit of the second valve 4 of the blower 6; wherein the desired set value I0For artificially set target values, e.g. the flow through the iodine box is now expected to be 50, then I0=50；
(2) The second flow meter 5 records the instantaneous flow I through the second valve 42The first flow meter 8 records the instantaneous flow I of the first valve 71Because the blower 6 maintains a fixed air intake, the total flow I in the two ducts isGeneral assemblyConstant, IGeneral assembly= I1+ I2In this state, the flow rate through the iodine chamber 2 is changed, and the opening of the second valve 4 is adjusted from the lower limit to the upper limit, during which the instantaneous flow rate I is recorded as the second flow meter 52Has reached the desired set point I0I.e. when I2= I0When the control is finished, stopping the control and keeping running;
(3) if the upper limit of the opening of the second valve 4 still does not reach the desired set value I0The control of the second valve is stopped and the opening of the first valve 7 is changed, whereupon the pressure in the first conduit 9 increases and the total flow I is now established’ General assemblyThe rotation speed of the blower 6 is adjusted to reduce the total flow in the pipeline to the previous total flow value I’ General assembly= IGeneral assemblyContinuously changing the opening degree of the first valve 7, adjusting the rotating speed of the blower 6 and keeping I’ General assembly=IGeneral assemblyAdjusted to the desired setting I of the reading of the second flow meter 52= I0Until then, the operation is finished and the operation is kept;
(4) the collected aerosol is attached to the filter paper above the shell, the collected iodine is attached to the iodine box, and the flow rate is set according to the flow rate set value I0The concentration of the radioactive substance in the atmosphere at this time is calculated. This step is a conventional step.
In the above embodiment, the first valve 7, the second valve 4 and the blower 6 are all connected to a PID controller, and the opening of the two valves and the rotation speed of the blower can be automatically controlled by PID (proportional-integral-derivative controller), so as to control the flow rate of the iodine box to reach the desired set value, and no manual operation is required to control the flow rate.
Details not described in the present specification belong to the prior art known to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (2)

1. The working method of the iodine sampler is characterized in that: the iodine sampler comprises a shell, an iodine box, a first pipeline, a first valve, a first flowmeter, a second pipeline, a second valve, a second flowmeter and an air blower, wherein an opening above the shell is communicated with the outside atmosphere, filter paper for collecting aerosol is arranged at an opening of the shell, one end of the first pipeline is communicated with the air blower, the other end of the first pipeline extends into the shell, the first pipeline is provided with the first valve, the first flowmeter is arranged at the first valve, one end of the second pipeline is communicated with the air blower, the other end of the second pipeline extends into the shell and is connected with the iodine box, the second pipeline is provided with the second valve, and the second flowmeter is arranged at the second valve; the working method of the iodine sampler comprises the following steps:
(1) in the initial state, a flow value I through the iodine box is set0Starting the air blower, wherein the air blower keeps fixed air inlet amount, the upper limit of the opening degree of the first valve and the lower limit of the opening degree of the second valve; wherein the desired set value I0A target value set artificially;
(2) the second flow meter records the instantaneous flow I through the second valve2The first flowmeter records the instantaneous flow I of the first valve1Total flow I in the two ducts because the blower maintains a fixed air intakeGeneral assemblyConstant, IGeneral assembly= I1+ I2In this state, the flow rate through the iodine box is changed, and the opening of the second valve is adjusted from the lower limit to the upper limit, in the process, as the instantaneous flow rate I recorded by the second flowmeter2Has reached the desired set point I0I.e. when I2= I0When the control is finished, stopping the control and keeping running;
(3) if the upper limit of the second valve opening still does not reach the required set value I0Stopping the control of the second valve, changing the opening of the first valve, increasing the pressure in the first pipe, and the total flow I’ General assemblyThe rotation speed of the blower is adjusted to make the total flow in the pipeline reach the previous total flow value I’ General assembly= IGeneral assemblyContinuously changing the opening of the first valve, adjusting the rotation speed of the blower and keeping I’ General assembly=IGeneral assemblyAdjusting the reading of the second flowmeter to a desired set value, I2= I0Until then, the operation is finished and the operation is kept;
(4) the collected aerosol is attached to the filter paper above the shell, the collected iodine is attached to the iodine box, and the flow rate is set according to the flow rate set value I0The concentration of the radioactive substance in the atmosphere at this time is calculated.
2. The method of operating an iodine sampler as claimed in claim 1, wherein: the first valve, the second valve and the air blower are all connected with the PID controller, and the flow of the iodine box is remotely and automatically controlled through the PID controller to reach a required set value.
CN201710772774.XA 2017-08-31 2017-08-31 Working method of iodine sampler Active CN107702950B (en)

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Publication number Priority date Publication date Assignee Title
CN109752751B (en) * 2019-01-23 2020-11-24 成都理工大学 In the air131I dynamic balance monitoring device and monitoring method
CN111220428A (en) * 2020-02-25 2020-06-02 中国辐射防护研究院 Multi-channel test device for sampling radioactive aerosol and gaseous iodine

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Publication number Priority date Publication date Assignee Title
JP2599979B2 (en) * 1988-10-25 1997-04-16 三菱電機株式会社 Iodine measuring device
CN2231798Y (en) * 1994-07-30 1996-07-24 上海仪器仪表成套厂吴县分厂 Sampler for radiation monitoring system
CN101769832B (en) * 2010-01-29 2012-06-06 北京华瑞核安科技有限公司 Radiation environment iodine automatic sampling device
CN101825529B (en) * 2010-01-29 2012-10-31 北京华瑞核安科技有限公司 Integrated super-flow automatic sampler
CN201637649U (en) * 2010-04-15 2010-11-17 武汉市天虹仪表有限责任公司 Measuring instrument for atmospheric particulate matter
CN103076208B (en) * 2013-01-08 2015-04-15 中国工程物理研究院核物理与化学研究所 Automatic sampling system for radioactive gas-carrying discharge substances
CN103063483A (en) * 2013-01-10 2013-04-24 厦门大学 Sampling device for mercury in atmosphere
CN203824807U (en) * 2013-12-23 2014-09-10 上海新漫传感技术研究发展有限公司 Portable type iodine sampling device
CN105842016A (en) * 2016-06-02 2016-08-10 阳江核电有限公司 Portable radioactive gas sampling device
CN205808479U (en) * 2016-06-16 2016-12-14 北京放射性核素实验室 V cone flow meter system for sampling ultrahigh flow aerosol

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