CN110689978B - Iodine steam generation and online detection recovery system for mandrel test - Google Patents
Iodine steam generation and online detection recovery system for mandrel test Download PDFInfo
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- CN110689978B CN110689978B CN201910923337.2A CN201910923337A CN110689978B CN 110689978 B CN110689978 B CN 110689978B CN 201910923337 A CN201910923337 A CN 201910923337A CN 110689978 B CN110689978 B CN 110689978B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/06—Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses an iodine vapor generation and online detection recovery system for a mandrel test, wherein iodine particles are arranged in an oval cavity of a negative-angle groove, the cavity is arranged in a constant-temperature water tank with a preset temperature, and the iodine particles are sublimated into iodine vapor; introducing iodine vapor into the flowing cuvette through argon, and allowing a tungsten light source to penetrate through the flowing cuvette and pass through the absorbance of the iodine vapor measured by a spectrophotometer; and after the iodine vapor flows through the furnace body, introducing sodium sulfite solution to absorb the iodine vapor, and finally judging whether the recovery is complete or not through ethanol solution. The system can change the equilibrium state of iodine sublimation and desublimation by setting the temperature of the water tank, the current working condition concentration is calculated by detecting the absorbance of iodine vapor on line, the sodium sulfite solution is used for absorbing the iodine vapor, and the ethanol solution is used for detecting whether the iodine vapor is completely recovered. The system is simple and safe to operate, is used for the working condition that iodine vapor is needed to corrode in the mandrel test, and realizes efficient and safe treatment of iodine waste gas.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel and material mechanical property testing, and particularly relates to an iodine vapor generation and on-line detection recovery system for a mandrel test.
Background
The fuel element is a core component of a nuclear fission source in the reactor, so that the fuel element has extremely high performance requirements on an element cladding containing a fuel core and a fission product, and the detection of the mechanical property outside the reactor is indispensable to the design of the nuclear fuel element of the reactor.
The reactor fuel pellet is UO2Generation of fission gases I in nuclear reactions2Iodine vapor is corrosive and acts on the inner surface of the envelope. Along with the increase of burnup, the increase of fission gas generated by fissile nuclide, the diffusion and the migration occur under the action of temperature gradient in the pellet, so that the irradiation swelling of the pellet is caused, the interaction between the pellet and the cladding causes the bar-shaped fuel element to present bamboo-shaped deformation, and the position with the maximum stress is ring ridge-shaped deformation.
Iodine-induced stress corrosion of zirconium alloys has been a major engineering concern in reactors, particularly at high burnup conditions due to reduced cladding material performance and increased amounts of fission products. Therefore, a mandrel test of a system capable of generating iodine vapor and monitoring and recovering on line needs to be designed to complete the out-of-stack mechanical property test, and the method has important practical significance for researching iodine induced stress corrosion.
At present, in the technical field of nuclear fuel and material mechanical property testing, a testing device is lacked at home and abroad to realize an iodine vapor generation and on-line detection and recovery system for a mandrel test. The working condition of iodine vapor generated in most of the existing tests is determined by approximate calculation of heating temperature, and the concentration of iodine cannot be accurately detected on line.
For example, the mechanical behavior of the NZ2 zirconium alloy plate under iodine vapor with different temperatures and different concentrations is described in detail in the document "Shiminghua, Li Zhongqu, Tianfeng, Dai, Zhang Jianjun, Zhongjun, Wangsheng.ZN 2 zirconium alloy iodine causes stress corrosion [ J ] rare metal materials and engineering, 2013,42(08): 1722-. The system has simple measurement principle, can realize different working conditions of iodine through the heating temperature of the oil bath, but has lower precision, can not realize the online detection of the iodine vapor concentration, and can only approximately calculate the partial pressure of the iodine through the temperature of the oil bath.
Also, for example, the literature "Isabelle Schuster, element Lemaignan, Jacques Joseph, testing and modifying the flowing of irradiation on iodine-induced stress corrosion cracking of zirconium alloy-4 [ J ], Nuclear Engineering and Design,1995,156:343-349, describes the effect of stress corrosion caused by irradiation iodine on zirconium alloys, and the condition for simulating iodine corrosion in the article is to directly put 60mg of iodine particles into the test section. The iodine vapor is generated on the inner surface of the cladding, so that the inner surface of the zirconium alloy cladding tube can be fully contacted with the iodine vapor and fully exposed in the iodine atmosphere, but the system is lack of on-line detection of iodine concentration and absorption and treatment of iodine waste gas, and causes certain harm to the environment.
Further, as disclosed in the patent "Yan sprout, Yi Qi Wei, Penqian, Zhao Wen jin, Liang bo, Wang Pengfei and Yan fai Wai an iodine pressure divider [ P ] for zirconium alloy I-SCC test, China: 201620372675.3,2016.04.28", an iodine vapor generating device is disclosed, the oil bath is not closed, the actual temperature of heating is determined only by a heating system, and a thermocouple is not added for measuring the temperature. When the test airflow is large, the iodine particles are easily brought to a gas outlet by inlet gas to be blocked, and the concentration of iodine cannot be accurately measured in real time.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide an iodine vapor generation and online detection recovery system for a mandrel test, iodine particles are placed in an oval cavity containing a negative-angle groove, and the iodine particles are sublimated into iodine vapor by heating a constant-temperature water tank; introducing iodine vapor into a flowing cuvette through argon, and calculating the concentration of the iodine vapor according to the absorbance of the iodine vapor measured by a spectrophotometer; and after the iodine vapor flows through the furnace body, introducing sodium sulfite solution to absorb the iodine vapor, and finally judging whether the recovery is complete or not through ethanol solution. The system can change the equilibrium state of iodine sublimation and desublimation by setting the temperature of the water tank, and the concentration of iodine vapor is detected on line through the absorbance of the iodine vapor.
The purpose of the invention is realized by the following technical scheme:
an iodine vapor generation and online detection recovery system for a mandrel test comprises a constant temperature water tank 2, an oval cavity 5 which is positioned in the constant temperature water tank 2 and contains a negative-angle groove, a gas inlet pipe 1 which is connected with the oval cavity 5 containing the negative-angle groove, a solid particle inlet pipe 3 which is connected with the oval cavity 5 containing the groove, a thermocouple 4 which is positioned on the upper surface of the outer part of the constant temperature water tank 2, a gas outlet pipe 7 which is connected with the oval cavity 5 containing the negative-angle groove, and a section of round visual glass 6 which is positioned on the front side of the constant temperature water tank 2 and is positioned on the gas outlet pipe 7; a fluidity cuvette 9 connected with the gas outlet pipe 7, and a light source 8 and a spectrophotometer 10 which are positioned at two sides of the fluidity cuvette 9; a furnace body 11 connected with a built-in mandrel of the fluidity cuvette 9, a water tank 12 connected with the furnace body 11, and a gas washing bottle 13 connected with the water tank 12;
when iodine-induced stress corrosion needs to be carried out on the inner surface of a mandrel in a furnace body 11, iodine vapor under different working conditions is generated and recovered through the system through on-line detection, iodine particles are added into an oval cavity 5 containing a negative-angle groove through a solid particle inlet pipe 3, argon is introduced into a gas inlet pipe 1, a constant-temperature water tank 2 is opened for heating, after the temperature measured by a thermocouple 4 is stabilized at a preset temperature, the generation of the iodine vapor is observed in real time through visual glass 6, a light source 8 is opened, the absorbance of the iodine vapor in a flowing cuvette 9 is detected through a spectrophotometer 10, the concentration of the iodine vapor under the current working condition can be known through calculation, the balance of sublimation and sublimation of iodine in the oval cavity 5 containing the negative-angle groove is changed by changing the heating temperature of the constant-temperature water tank 2, the working condition of the preset iodine vapor concentration is further reached, and waste gas passing through the mandrel in the furnace, finally, whether the iodine vapor is completely recovered is detected through the gas washing bottle 13.
An acute angle is processed at the bottom of the oval cavity 5 with the negative-angle groove and used for storing iodine particles, and the particles are prevented from being brought to a gas outlet by gas of the gas inlet pipe 1 to cause blockage.
After the flowing cuvette 9 is irradiated by the light source 8, the absorbance can be measured in the spectrophotometer 10, the concentration of the iodine vapor under the current working condition can be calculated, and the online detection is realized.
The water tank 12 contains sodium sulfite solution to absorb iodine vapor, and the gas washing bottle 13 contains ethanol solution to detect whether the iodine vapor is completely recovered.
The invention has the following advantages and beneficial effects:
1. the invention has the advantages of simple installation, higher precision, simple operation and high reliability.
2. The invention can detect the absorbance of the iodine vapor on line, and can calculate the concentration of the current iodine vapor through the absorbance of the iodine vapor in the fluidity cuvette.
3. The invention can recover iodine vapor in real time through sodium sulfite solution.
4. The invention can judge whether the iodine vapor is completely recovered or not through the ethanol solution.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the invention relates to an iodine vapor generation and online detection recovery system for a mandrel test, which comprises a constant temperature water tank 2, an oval cavity 5 which is positioned in the constant temperature water tank 2 and contains a negative-angle groove, a gas inlet pipe 1 which is connected with the oval cavity 5 containing the negative-angle groove, a solid particle inlet pipe 3 which is connected with the oval cavity 5 containing the groove, a thermocouple 4 which is positioned on the upper surface of the outer part of the constant temperature water tank 2, a gas outlet pipe 7 which is connected with the oval cavity 5 containing the negative-angle groove, and a section of round visual glass 6 which is positioned on the front side of the constant temperature water tank 2 and is positioned; a fluidity cuvette 9 connected with the gas outlet pipe 7, and a light source 8 and a spectrophotometer 10 which are positioned at two sides of the fluidity cuvette 9; a furnace body 11 connected with a built-in mandrel of the fluidity cuvette 9, a water tank 12 connected with the furnace body 11, and a gas washing bottle 13 connected with the water tank 12;
the working principle of the embodiment is as follows: add the oval cavity 5 that contains the negative angle recess with the iodine granule through solid particle import pipe 3, let in gas import pipe 1 with argon gas, open the heating of thermostatic water tank 2, treat that the thermocouple 4 measured temperature is stable after presetting the temperature, through the generation of visual glass 6 real-time observation iodine vapour, open light source 8, detect the absorbance of iodine vapour in mobility cell 9 by spectrophotometer 10, can know the concentration of iodine vapour under the current operating mode through calculating, through the heating temperature who changes thermostatic water tank 2, make the sublimation of iodine and the balanced change of desublimation in the oval cavity 5 that contains the negative angle recess, and then reach the operating mode of presetting iodine vapour concentration, the waste gas that will pass through the inner core axle of furnace body 11 lets in water tank 12 and retrieves, finally detect whether to retrieve completely through gas washing bottle 13.
As a preferred embodiment of the invention, the bottom of the oval chamber 5 with the negative-angle groove is processed with an acute angle for storing iodine particles, so as to prevent the particles from being brought to a gas outlet by the gas of the gas inlet pipe 1 to cause blockage, and the constant-temperature water tank 2 comprises a round visual glass 6; after the fluidity color comparison 9 is irradiated by the light source 8, the absorbance can be measured in a spectrophotometer 10, the concentration of the iodine vapor under the current working condition can be calculated, and the online detection is realized; the water tank 12 contains sodium sulfite solution to absorb iodine vapor, and the gas washing bottle 13 contains ethanol solution to detect whether the recovery is complete.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. The utility model provides an iodine vapour generates and on-line measuring recovery system for dabber is experimental which characterized in that: the device comprises a constant temperature water tank (2), an oval cavity (5) which is arranged in the constant temperature water tank (2) and contains a negative-angle groove, a gas inlet pipe (1) which is connected with the oval cavity (5) containing the negative-angle groove, a solid particle inlet pipe (3) which is connected with the oval cavity (5) containing the negative-angle groove, a thermocouple (4) which is arranged on the outer upper surface of the constant temperature water tank (2), and a gas outlet pipe (7) which is connected with the oval cavity (5) containing the negative-angle groove, wherein a section of round visual glass (6) is arranged on the gas outlet pipe (7) and is positioned on the front side of; a fluidity cuvette (9) connected with the gas outlet pipe (7), and a light source (8) and a spectrophotometer (10) which are positioned at two sides of the fluidity cuvette (9); a furnace body (11) connected with a built-in mandrel of the fluidity cuvette (9), a water tank (12) connected with the furnace body (11), and a gas washing bottle (13) connected with the water tank (12);
when iodine stress corrosion needs to be carried out on the inner surface of a mandrel in a furnace body (11), iodine vapor under different working conditions is generated and recovered through the system in an online detection mode, iodine particles are added into an oval cavity (5) with a negative-angle groove through a solid particle inlet pipe (3), argon is introduced into a gas inlet pipe (1), a constant temperature water tank (2) is opened for heating, after the temperature measured by a thermocouple (4) is stabilized at a preset temperature, the generation of the iodine vapor is observed in real time through visual glass (6), a light source (8) is opened, the absorbance of the iodine vapor in a flowing colorimetric dish (9) is detected through a spectrophotometer (10), the concentration of the iodine vapor under the current working condition can be known through calculation, the balance between sublimation and sublimation of iodine in the oval cavity (5) with the negative-angle groove is changed by changing the heating temperature of the constant temperature water tank (2), and the working condition of the concentration of the preset iodine vapor is further reached, introducing waste gas passing through an inner core shaft of the furnace body (11) into a water tank (12) for recycling, and finally detecting whether iodine vapor is completely recycled or not through a gas washing bottle (13);
the bottom of the oval chamber (5) with the negative-angle groove is machined into an acute angle for storing iodine particles, so that the particles are prevented from being brought to a gas outlet by gas of the gas inlet pipe (1) to cause blockage.
2. The iodine vapor generation and on-line detection recovery system for mandrel testing of claim 1, wherein: the water tank (12) is used for containing sodium sulfite solution to absorb iodine vapor, and the gas washing bottle (13) is used for containing ethanol solution to detect whether the iodine vapor is completely recovered.
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| CN201910923337.2A CN110689978B (en) | 2019-09-27 | 2019-09-27 | Iodine steam generation and online detection recovery system for mandrel test |
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| CN201910923337.2A CN110689978B (en) | 2019-09-27 | 2019-09-27 | Iodine steam generation and online detection recovery system for mandrel test |
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| CN110689978B true CN110689978B (en) | 2020-12-22 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2546873Y (en) * | 2001-12-29 | 2003-04-23 | 中盐制盐工程技术研究院 | Iodometering instrument |
| KR20120124301A (en) * | 2011-05-03 | 2012-11-13 | 한국원자력연구원 | Pellet-Cladding Interaction testing mandrel cell and System comprising Thereof |
| CN203299069U (en) * | 2013-07-01 | 2013-11-20 | 中国核动力研究设计院 | Stress corrosion cracking test device |
| CN205049410U (en) * | 2015-11-03 | 2016-02-24 | 中国核动力研究设计院 | Take bull mechanical test device of atmosphere environment |
| CN205582511U (en) * | 2016-04-28 | 2016-09-14 | 中国核动力研究设计院 | A iodine gas bleeder mechanism for zircaloy I -SCC is experimental |
| CN109000577A (en) * | 2018-07-02 | 2018-12-14 | 西安交通大学 | Cladding nuclear fuels caliber is to deformation measuring system under a kind of high temperature iodine steam environment |
-
2019
- 2019-09-27 CN CN201910923337.2A patent/CN110689978B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2546873Y (en) * | 2001-12-29 | 2003-04-23 | 中盐制盐工程技术研究院 | Iodometering instrument |
| KR20120124301A (en) * | 2011-05-03 | 2012-11-13 | 한국원자력연구원 | Pellet-Cladding Interaction testing mandrel cell and System comprising Thereof |
| CN203299069U (en) * | 2013-07-01 | 2013-11-20 | 中国核动力研究设计院 | Stress corrosion cracking test device |
| CN205049410U (en) * | 2015-11-03 | 2016-02-24 | 中国核动力研究设计院 | Take bull mechanical test device of atmosphere environment |
| CN205582511U (en) * | 2016-04-28 | 2016-09-14 | 中国核动力研究设计院 | A iodine gas bleeder mechanism for zircaloy I -SCC is experimental |
| CN109000577A (en) * | 2018-07-02 | 2018-12-14 | 西安交通大学 | Cladding nuclear fuels caliber is to deformation measuring system under a kind of high temperature iodine steam environment |
Non-Patent Citations (2)
| Title |
|---|
| NZ2锆合金碘致应力腐蚀;石明华 等;《稀有金属材料与工程》;20130831;第42卷(第8期);1722-1725 * |
| Testing and modelling the influence of irradiation on iodine-induced stress corrosion cracking of Zircaloy-4;Isabelle Schuster 等;《Nuclear Engineering and Design》;19950630;第156卷(第3期);343-349 * |
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