CN114689793A - System and method for monitoring concentration of gas in containment vessel - Google Patents
System and method for monitoring concentration of gas in containment vessel Download PDFInfo
- Publication number
- CN114689793A CN114689793A CN202210125472.4A CN202210125472A CN114689793A CN 114689793 A CN114689793 A CN 114689793A CN 202210125472 A CN202210125472 A CN 202210125472A CN 114689793 A CN114689793 A CN 114689793A
- Authority
- CN
- China
- Prior art keywords
- sampling
- module
- pipeline
- containment
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 148
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000005259 measurement Methods 0.000 claims abstract description 50
- 238000009833 condensation Methods 0.000 claims abstract description 9
- 230000005494 condensation Effects 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 127
- 238000010438 heat treatment Methods 0.000 claims description 69
- 239000002131 composite material Substances 0.000 claims description 58
- 230000000149 penetrating effect Effects 0.000 claims description 52
- 238000010926 purge Methods 0.000 claims description 47
- 238000012545 processing Methods 0.000 claims description 24
- 239000001257 hydrogen Substances 0.000 claims description 23
- 229910052739 hydrogen Inorganic materials 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 20
- 239000001301 oxygen Substances 0.000 claims description 20
- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- 230000035515 penetration Effects 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 10
- 239000000443 aerosol Substances 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- XMBWDFGMSWQBCA-RNFDNDRNSA-M iodine-131(1-) Chemical compound [131I-] XMBWDFGMSWQBCA-RNFDNDRNSA-M 0.000 claims description 4
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 2
- 239000000941 radioactive substance Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- 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
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
-
- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/005—H2
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the technical field of containment vessel gas concentration monitoring, and particularly relates to a containment vessel gas concentration monitoring system and method. The in-containment gas concentration monitoring system comprises a sampling module (2) arranged in a containment (1) and a measuring module (7) arranged outside the containment (1), wherein the sampling module (2) is used for collecting sample gas in the containment (1), the measuring module (7) is used for measuring and analyzing the sample gas, and the sampling module (2) and the measuring module (7) can prevent water vapor in the sample gas from condensing. The invention can monitor the concentration of the gas at different positions in the containment (1) on the premise of preventing the radioactive substance from leaking out, simultaneously prevent the measurement error caused by the condensation of the water vapor in the sample gas and solve the fidelity problem of the sample gas.
Description
Technical Field
The invention belongs to the technical field of containment vessel gas concentration monitoring, and particularly relates to a containment vessel gas concentration monitoring system and method.
Background
After the fukushima nuclear power station accident, the national nuclear safety administration organizes large inspection of under-construction and in-service nuclear power plants and then issues corresponding improvement requirements. The improvement requirement specifies that the risk of hydrogen combustion/explosion in the containment vessel under a serious accident needs to be controlled, and the monitoring of the gas concentration in the containment vessel under the serious accident is a precondition for controlling the hydrogen risk.
At present, a system for monitoring the concentration of gas in a containment vessel after a serious accident in a nuclear power plant is mainly divided into an in-shell monitoring system and an out-shell monitoring system.
The in-shell monitoring system has the advantage that the measuring device is relatively simple, and only the sensor needs to be installed in the containment vessel, and then the measured signal is transmitted to the cabinet outside the shell through the cable. But the defects of the in-shell monitoring system are obvious, firstly, the performance of the in-shell sensor is not easy to be ensured under the high-temperature, high-pressure, high-radiation and high-aerosol environments under serious accidents; secondly, its signal transmission is limited by the cable, requiring the use of cables certified for severe accident environmental conditions.
The out-of-shell monitoring system is used for guiding out the gas in the containment to the outside of the containment and monitoring the concentration of the gas through a sensor arranged outside the containment. The out-of-shell monitoring system avoids the influence of high temperature, high pressure, high radiation and high aerosol environment in the containment on the performance of the sensor under serious accidents.
Currently, an out-of-shell monitoring system has been patented (patent application No. 201710425110.6). There are still some problems with the design of this solution. Firstly, the problem of fidelity of the sampled gas is solved, the containment is in a high-temperature and high-pressure environment after an accident, a large amount of water vapor is filled in the containment, and the water vapor is easy to condense in the process of sampling to the outside of the containment, so that the measurement precision is seriously influenced. Secondly, the gas concentrations at different positions in the containment vessel are measured in sequence, time intervals exist in the measurement at each position, and the real-time performance of the monitoring is problematic.
In summary, it is desirable to design a monitoring system and method to meet the requirement of monitoring the concentration of the gas in the containment and solve the problems of fidelity and real-time of the sampled gas, so as to control the risk of hydrogen combustion/explosion.
Disclosure of Invention
The invention aims to provide a containment gas concentration monitoring system and method, which can synchronously monitor the concentration of gas at different positions in a containment vessel on the premise of preventing radioactive substances from leaking out, prevent measurement errors caused by condensation of water vapor and solve the problem of fidelity of sampled gas.
In order to achieve the above object, the present invention adopts a technical solution that is a containment gas concentration monitoring system, including a sampling module disposed in a containment and a measurement module disposed outside the containment, wherein the sampling module is configured to collect a sample gas in the containment, the measurement module is configured to perform measurement and analysis on the sample gas, and the sampling module and the measurement module are capable of preventing the water vapor in the sample gas from condensing.
Further, in the present invention,
the sampling module is connected with the measuring module through a penetrating piece and a composite pipeline, the penetrating piece penetrates through the containment vessel, the composite pipeline is located outside the containment vessel, the top end of the composite pipeline is connected with the penetrating piece, and the tail end of the composite pipeline is connected with the measuring module;
the containment is characterized by further comprising a backflow module arranged outside the containment, the backflow module is connected with the measurement module, the sample gas in the measurement module returns to the containment through the backflow module, and the containment, the sampling module, the penetration piece, the compound pipeline, the measurement module and the backflow module form a closed loop;
the device also comprises a purging module arranged outside the containment, wherein the purging module is connected with the composite pipeline and used for purging and cleaning the sampling module.
Further, in the present invention,
the sampling module comprises a plurality of sampling pipelines, the top ends of the sampling pipelines are provided with sampling heads, and the sampling heads are arranged on measuring points at different positions in the containment vessel;
the sampling pipeline penetrates through the penetrating piece to enter the composite pipeline, and the tail end of the sampling pipeline is connected with the measurement module in the composite pipeline;
the sampling head is equipped with aerosol filter equipment, radioiodine adsorption equipment, buckler and throttle pressure reduction means, aerosol filter equipment with radioiodine adsorption equipment is used for gas filtration and radioactivity to get rid of, the buckler is used for preventing water entering the sampling head, throttle pressure reduction means is used for preventing to get into the vapor condensation of sampling head.
Further, in the present invention,
the measuring module consists of a plurality of measuring units which are connected in parallel, and the measuring units correspond to the sampling pipelines one by one;
each measuring unit comprises a measuring pipeline, the top end of the measuring pipeline is connected with the tail end of the sampling pipeline in the composite pipeline, and the tail end of the measuring pipeline is connected with the backflow module;
the sampling valve group is sequentially connected with the pressure reducing valve, the gas concentration sensor and the flow controller in series, and the sampling valve group is close to the top end of the measuring pipeline; the pressure reducing valve and the flow controller are used for maintaining the sample gas passing through the measuring module within set pressure and flow; the gas concentration sensor adopts a high-temperature resistant design;
the measuring module is internally provided with heating, heat-preserving and temperature-controlling equipment which can monitor the internal environment temperature of the measuring module, automatically turn on or turn off the heating function, prevent the water vapor in the sample gas entering the measuring module from being condensed and ensure the good operating environment and measuring precision of the gas concentration sensor;
the sampling valve groups in the measuring units can be simultaneously opened in the sampling and measuring process so as to realize the function of simultaneously sampling and measuring a plurality of measuring points.
Further, in the present invention,
the gas concentration sensor comprises a hydrogen analyzer, a water vapor analyzer and an oxygen analyzer which are arranged in series, and can measure the concentrations of hydrogen, water vapor and oxygen in real time;
the hydrogen analyzer is connected with a hydrogen analyzer signal processing module, the water vapor analyzer is connected with a water vapor analyzer signal processing module, and the oxygen analyzer is connected with an oxygen analyzer signal processing module;
the hydrogen analyzer, the water vapor analyzer and the oxygen analyzer are concentration measuring devices of the corresponding analyzers and output electric signals related to concentration;
the hydrogen analyzer signal processing module, the water vapor analyzer signal processing module and the oxygen analyzer signal processing module are signal processing devices of corresponding analyzers, convert output electric signals into concentration signals and remotely transmit the concentration signals.
Further, in the present invention,
the backflow module comprises a return pipeline, and a buffer tank, a compressor and a stop valve which are sequentially arranged on the return pipeline;
the buffer tank is arranged at the top end of the return pipeline, the tail end of the measurement pipeline in the measurement module is connected with the buffer tank, and the tail end of the return pipeline extends into the containment through the composite pipeline;
the compressor is used for sending the sample gas back to the containment;
the buffer tank plays a buffering role in the sampling and measuring process, assists in stabilizing the measured pressure and flow, and the bottom of the buffer tank is used for collecting condensed water of the water vapor component in the sample gas.
Further, the purging module comprises a high-pressure nitrogen tank and a plurality of purging pipelines, the purging pipelines correspond to the sampling pipelines one by one, the top ends of the purging pipelines are connected with the high-pressure nitrogen tank, the tail ends of the purging pipelines are connected with the sampling pipelines in the composite pipeline, a reverse purging valve group is arranged on the purging pipelines, and high-pressure nitrogen is injected into the sampling pipelines through switches of the reverse purging valve group to clean the sampling pipelines; the purge module is capable of back purging the sample line before and during sample measurement to prevent clogging of the sample line.
Further, in the present invention,
the outermost layer of the composite pipeline is an outer sheath, a second heat insulation layer is arranged on the inner surface of the outer sheath, a heating cable is arranged at the central position of an inner cavity of the composite pipeline, and the sampling pipeline and the return pipeline are arranged around the heating cable;
the heating cable is used for preventing the water vapor in the sample gas from condensing; the sample gas refers to the sample gas in the sampling line and the return line in the composite line during sampling.
Further, in the present invention,
the top end of the penetrating piece is positioned on one side of the inner surface of the containment vessel, a seal head is arranged for sealing the penetrating piece, and the tail end of the penetrating piece is positioned on one side of the outer surface of the containment vessel; the top end of the composite pipeline is connected to the tail end of the penetrating piece;
the penetrating piece is cylindrical, the outermost layer of the penetrating piece is a horizontal sleeve, a first heat-insulating layer is arranged on the inner surface of the horizontal sleeve, and the length of the first heat-insulating layer is consistent with that of the penetrating piece;
a heating device is arranged in the center of the inner cavity of the penetrating piece, and the sampling pipeline and the return pipeline are arranged around the heating device and are not in contact with the first heat preservation layer; the heating device is used for preventing the water vapor in the sample gas from condensing; the sample gas is the sample gas in the sampling line and the return line in the penetration during sampling;
the heating device comprises a heating sleeve and a heating rod arranged in the heating sleeve, the heating sleeve and the heating rod are equal in length, and the heating sleeve extends to the position of the end socket;
a plurality of pipeline supports are arranged in the inner cavity of the penetrating piece at intervals, and the sampling pipeline and the return pipeline are fixedly arranged in the inner cavity of the penetrating piece through the pipeline supports and are not in contact with each other;
the temperature control device is arranged inside the penetrating piece and used for measuring the internal environment temperature of the penetrating piece, if the temperature is lower than the requirement, the heating is automatically started, and if the temperature exceeds the requirement, the heating is automatically stopped.
In order to achieve the above object, the present invention further discloses a containment gas concentration monitoring method for the containment gas concentration monitoring system, which includes the following steps:
step S1, cleaning the sampling line of the sampling module through the purging module; the penetration piece and the composite pipeline are subjected to preheating treatment;
step S2, sampling the gas in the containment by the sampling module, and sending the sample gas into the measurement module for measurement through the penetration piece and the composite pipeline; in the process, the water vapor in the sample gas is prevented from condensing through the throttling and pressure reducing device in the sampling module, the penetrating piece, the composite pipeline and the heating, heat-preserving and temperature-controlling equipment in the measuring module, so that the fidelity problem of the sample gas is solved, and the measuring precision is improved;
and step S3, after concentration measurement is finished, the sample gas is conveyed back to the containment by the backflow module to form closed circulation.
The invention has the beneficial effects that:
1. the throttling and pressure reducing device of the sampling module 2 reduces the pressure of the sample gas to overheat, and prevents the water vapor in the sample gas from condensing in the sampling head 3 in the containment 1.
2. Through the through-part 5 of redesigning, make through-part 5 inside obtain whole heating and heat preservation, prevent that the vapor in the sample gas from taking place the condensation when passing through-part 5 to the maintenance and the change of follow-up heating rod have been made things convenient for in the design of the heating jacket pipe of through-part 5.
3. The design of the composite pipeline 6 effectively reduces the heating power while meeting the heating and heat-preserving requirements and preventing the condensation of water vapor.
4. The sample gas is sent back to the containment 1 through the backflow module 12, so that the loop is closed, and radioactive substances are prevented from leaking.
5. The purging module 17 purges the system, so that the cleanness of the system pipeline (the sampling pipeline 4) is ensured.
6. The system can run a plurality of groups of modules in parallel, and realizes the synchronous monitoring of the gas concentration at different positions in the containment vessel 1.
7. The system realizes the fidelity of the sample gas, ensures the measurement precision and improves the measurement efficiency and the real-time property.
Drawings
Fig. 1 is a schematic diagram of the components of an in-containment gas concentration monitoring system according to an embodiment of the present invention (the number of sampling lines 4 is 3, which is only schematic).
Fig. 2 is a schematic diagram of a gas concentration sensor 10 according to an embodiment of the present invention.
FIG. 3 is a schematic view (in axial cross-section) of a through-member 5 according to an embodiment of the invention;
FIG. 4 is a schematic view (in radial cross-section) of a through-member 5 according to an embodiment of the invention;
FIG. 5 is a schematic representation (in radial cross-section) of a composite pipeline 6 according to an embodiment of the present invention;
in the figure: 1-containment vessel, 2-sampling module, 3-sampling head, 4-sampling pipeline, 5-penetrating piece, 6-composite pipeline, 7-measuring module, 8-sampling valve group, 9-pressure reducing valve, 10-gas concentration sensor, 11-flow controller, 12-reflux module, 13-buffer tank, 14-compressor, 15-stop valve, 16-return pipeline, 17-purging module, 18-back-purging valve group, 19-high-pressure nitrogen tank, 20-seal head, 21-containment vessel inner shell (the containment vessel 1 is of double-layer structure), 22-pipeline bracket, 23-horizontal sleeve, 24-containment vessel outer shell (the containment vessel 1 is of double-layer structure), 25-temperature control device, 26-heating device (comprising heating sleeve and heating rod), 27-a first heat preservation layer, 28-a second heat preservation layer, 29-a heating cable, 30-an outer sheath, 31-a reactor core, 32-a hydrogen analyzer, 33-a water vapor analyzer, 34-an oxygen analyzer, 35-a hydrogen analyzer signal processing module, 36-a water vapor analyzer signal processing module and 37-an oxygen analyzer signal processing module.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the in-containment gas concentration monitoring system provided by the present invention includes a sampling module 2 disposed in a containment 1 and a measurement module 7 disposed outside the containment 1, where the sampling module 2 is used to collect sample gas containing water vapor in the containment 1, the measurement module 7 is used to perform measurement and analysis on the sample gas, and the sampling module 2 and the measurement module 7 can prevent the water vapor in the sample gas from condensing.
The sampling module 2 is connected with the measuring module 7 through a penetrating piece 5 and a composite pipeline 6, the penetrating piece 5 penetrates through the containment vessel 1, the composite pipeline 6 is positioned outside the containment vessel 1, the top end of the composite pipeline 6 is connected with the penetrating piece 5, and the tail end of the composite pipeline 6 is connected with the measuring module 7;
the containment vessel comprises a containment vessel 1 and is characterized by further comprising a backflow module 12 arranged outside the containment vessel 1, wherein the backflow module 12 is connected with a measurement module 7, sample gas in the measurement module 7 enters the backflow module 12 after concentration measurement is completed and returns to the containment vessel 1 through the backflow module 12, and the containment vessel 1, a sampling module 2, a penetrating piece 5, a composite pipeline 6, the measurement module 7 and the backflow module 12 form a closed loop, so that the measured sample gas returns to the containment vessel 1 again after measurement is completed, and radioactive substances are prevented from leaking; the penetration piece 5, the composite pipeline 6 and the measuring module 7 are all designed with heating, heat preservation and temperature control equipment, so that the heat tracing temperature exceeds the saturation temperature of water, and the sample gas in the penetration piece 5, the composite pipeline 6 and the measuring module 7 is prevented from being condensed by water vapor in the sampling process;
the device further comprises a purging module 17 arranged outside the containment vessel 1, wherein the purging module 17 is connected with the compound pipeline 6 and used for purging and cleaning the sampling module 2.
The sampling module 2 comprises a plurality of sampling pipelines 4, the top ends of the sampling pipelines 4 are provided with sampling heads 3, and the sampling heads 3 are arranged on measuring points at different positions in the containment 1 to simultaneously sample the gas in the containment 1;
the sampling pipeline 4 passes through the penetrating piece 5 to enter the composite pipeline 6 (the part of the sampling pipeline 4 outside the containment 1 is completely arranged in the composite pipeline 6), and the tail end of the sampling pipeline 4 is connected with the measurement module 7 in the composite pipeline 6;
sampling head 3 is equipped with aerosol filter equipment, radioactive iodine adsorption equipment, buckler and throttle pressure reduction means, aerosol filter equipment and radioactive iodine adsorption equipment are used for gas filtration and radioactivity to get rid of (filtering aerosol and radioactive substance among the sampling gas), the buckler is used for preventing that water from getting into sampling head 3 (filtering the water among the sampling gas), throttle pressure reduction means is used for stepping down sampling gas, make sampling gas be in overheated state, prevent to get into the vapor condensation among the sampling gas of sampling head 3.
The measuring module 7 consists of a plurality of measuring units which are connected in parallel, and the measuring units correspond to the sampling pipelines 4 one by one;
each measuring unit comprises a measuring pipeline, the top end of the measuring pipeline is connected with the tail end of the sampling pipeline 4 in the composite pipeline 6, and the tail end of the measuring pipeline is connected with the backflow module 12;
the device also comprises a sampling valve group 8, a pressure reducing valve 9, a gas concentration sensor 10 and a flow controller 11 which are sequentially arranged on the measuring pipeline in series, wherein the sampling valve group 8 is close to the top end of the measuring pipeline; the pressure reducing valve 9 and the flow controller 11 are used for maintaining the sample gas passing through the measuring module 7 within the set pressure and flow; the gas concentration sensor 10 adopts a high temperature resistant design;
the heating, heat preservation and temperature control equipment is arranged in the measuring module 7, the internal environment temperature of the measuring module 7 can be monitored, the heating function can be automatically turned on or off, the condensation of water vapor in the sample gas entering the measuring module 7 is prevented, and the good operation environment and the measuring precision of the gas concentration sensor 10 are ensured;
the sampling valve groups 8 in each measuring unit can be opened simultaneously in the sampling and measuring process so as to realize the function of simultaneously sampling and measuring a plurality of measuring points.
The gas concentration sensor 10 (shown in fig. 2) includes a hydrogen analyzer 32, a water vapor analyzer 33, and an oxygen analyzer 34 arranged in series, and is capable of measuring the concentrations of hydrogen, water vapor, and oxygen in real time;
the hydrogen analyzer 32 is connected with a hydrogen analyzer signal processing module 35, the water vapor analyzer 33 is connected with a water vapor analyzer signal processing module 36, and the oxygen analyzer 34 is connected with an oxygen analyzer signal processing module 37;
the hydrogen analyzer 32, the water vapor analyzer 33, and the oxygen analyzer 34 are concentration measuring devices of the respective analyzers, and output electric signals related to the concentrations;
the hydrogen analyzer signal processing module 35, the water vapor analyzer signal processing module 36, and the oxygen analyzer signal processing module 37 are signal processing devices of respective analyzers, convert output electrical signals into concentration signals, and remotely transmit the concentration signals.
The return module 12 comprises a return line 16 and a buffer tank 13, a compressor 14 and a stop valve 15 which are arranged on the return line 16 in sequence;
the buffer tank 13 is arranged at the top end of the return pipeline 16, the tail end of the measurement pipeline in the measurement module 7 is connected with the buffer tank 13, and the tail end of the return pipeline 16 extends into the containment 1 through the composite pipeline 6;
a compressor 14 for returning the sample gas to the containment 1;
buffer tank 13 plays the cushioning effect in the sampling measurement process, supplementary stable measuring pressure and flow, and the bottom of buffer tank 13 is used for collecting the comdenstion water of the steam component in the sample gas.
The purging module 17 comprises a high-pressure nitrogen tank 19 and a plurality of purging pipelines, the purging pipelines correspond to the sampling pipelines 4 one by one, the top ends of the purging pipelines are connected with the high-pressure nitrogen tank 19, the tail ends of the purging pipelines are connected with the sampling pipelines 4 in the composite pipeline 6, a reverse purging valve group 18 is arranged on the purging pipelines, and high-pressure nitrogen is injected into the sampling pipelines 4 through a switch of the reverse purging valve group 18, so that the cleaning of the sampling pipelines 4 is realized; the purge module 17 is capable of back purging the sample line 4 before and during sample measurement to prevent clogging of the sampling head 3.
As shown in fig. 5, the composite pipeline 6 adopts a multiple-in-one design, and the outermost layer of the composite pipeline 6 is an outer sheath 30 for preventing the pipeline from being worn; the inner surface of the outer sheath 30 is provided with a second insulating layer 28 for preventing heat dissipation; a heating cable 29 is arranged at the central position of the inner cavity of the composite pipeline 6, and the sampling pipeline 4 and the return pipeline 16 are closely arranged around the heating cable 29;
the heating cable 29 enables the heat tracing temperature to exceed the saturation temperature of water, is used for preventing the water vapor in the sample gas from condensing, meets the fidelity requirement of the sample gas and reduces the heating power to the maximum extent; sample gas refers to the sample gas in the sample line 4 and return line 16 within the composite line 6 during sampling.
As shown in fig. 3 and 4, the top end of the penetrating member 5 is located on one side of the inner surface of the containment vessel 1, and a sealing head 20 is provided for sealing the penetrating member 5, and the sealing head 20 is used for isolating the inside and the outside of the containment vessel, so as to ensure that the penetrating member 5 can be heated in the whole process; the tail end of the penetrating piece 5 is positioned on one side of the outer surface of the containment vessel 1; the top end of the composite pipeline 6 is connected to the tail end of the penetrating piece 5;
the penetrating piece 5 is cylindrical, the outermost layer is a horizontal sleeve 23, the horizontal sleeve 23 penetrates through the containment vessel 1 to realize communication between the inside and the outside of the containment vessel (the containment vessel 1 in fig. 3 is a double-layer structure, and the horizontal sleeve 23 penetrates through the inner containment vessel shell 21 and the outer containment vessel shell 24); a first heat-insulating layer 27 is arranged on the inner surface of the horizontal sleeve 23, and the length of the first heat-insulating layer 27 is consistent with that of the penetrating piece 5;
a heating device 26 is arranged in the center of the inner cavity of the penetrating piece 5, and the sampling pipeline 4 and the return pipeline 16 are arranged around the heating device 26 and are not in contact with the first heat-preservation layer 27; the heating device 26 makes the tracing temperature exceed the saturation temperature of water for preventing the water vapor in the sample gas from condensing; sample gas refers to the sample gas in the sampling line 4 and return line 16 within the penetration 5 during sampling;
the heating device 26 comprises a heating sleeve and a heating rod arranged in the heating sleeve, the heating sleeve and the heating rod are equal in length, and the heating sleeve extends to the position of the end socket 20; the heating rod is inserted from the outside of the containment vessel 1 along the heating sleeve, and can be directly pulled out for maintenance or replacement during maintenance
A plurality of pipeline brackets 22 are arranged in the inner cavity of the penetrating piece 5 at intervals, and the sampling pipeline 4 and the return pipeline 16 are fixedly arranged in the inner cavity of the penetrating piece 5 through the pipeline brackets 22 and are not mutually contacted (are respectively and independently installed);
the temperature control device 25 is arranged in the penetrating piece 5 and used for measuring the internal environment temperature of the penetrating piece 5, if the temperature is lower than the requirement, the heating is automatically started, and if the temperature exceeds the requirement, the heating is automatically stopped.
The preheating mode is started before the containment gas concentration monitoring system operates, the heating rod in the heating device 26 of the penetration piece 5 is started, the penetration piece 5 is integrally heated in a heat radiation mode, and the temperature inside the penetration piece 5 is measured and controlled through the temperature control device 25. On the other hand, heat dissipation is prevented by the first heat-insulating layer 27, ensuring that during operation no condensation of water vapour occurs in the sample gas in the sampling line 4 in the penetration 5. The composite line 6 also needs to be preheated before operation.
The invention also discloses a containment gas concentration monitoring method for the containment gas concentration monitoring system, which comprises the following steps:
step S1, cleaning the sampling pipeline 4 of the sampling module 2 by the purge module 17; the penetration piece 5 and the composite pipeline 6 are subjected to preheating treatment;
step S2, sampling the gas in the containment 1 through the sampling module 2, and sending the sample gas to the measuring module 7 through the penetration piece 5 and the composite pipeline 6 for measurement; in the process, the water vapor in the sample gas is prevented from condensing through the throttling and pressure reducing device in the sampling module 2, the penetrating piece 5, the composite pipeline 6 and the heating, heat-preserving and temperature-controlling equipment in the measuring module 7, so that the fidelity problem of the sample gas is solved, and the measuring precision is improved;
step S3, after the concentration measurement is completed, the sample gas is sent back to the containment 1 by the backflow module 12, forming a closed cycle.
The containment gas concentration monitoring system can realize high-precision synchronous monitoring of gas concentrations at different positions in the containment 1 by arranging a plurality of groups of modules to run in parallel.
The invention provides a practical application of a containment gas concentration monitoring system, which comprises the following steps:
when a serious accident of a nuclear power station occurs, the monitoring system is put into operation, firstly, the sampling module 2 in the containment 1 is reversely purged through the purging module 17 so as to clean the sampling pipeline 4; then, a sampling valve group 8 in a measurement module 7 outside the containment vessel 1, a compressor 14 and a stop valve 15 in a backflow module 12 are simultaneously opened, and sampling measurement is simultaneously started by a plurality of sampling pipelines 4; the measured sampling gas is pumped back into the containment vessel 1 through the compressor 14 in the backflow module 12, so that closed circulation is guaranteed, and leakage of radioactive materials is prevented.
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 (10)
1. A containment gas concentration monitoring system is characterized in that: the device comprises a sampling module (2) arranged in a containment (1) and a measuring module (7) arranged outside the containment (1), wherein the sampling module (2) is used for collecting sample gas in the containment (1), the measuring module (7) is used for measuring and analyzing the sample gas, and the sampling module (2) and the measuring module (7) can prevent water vapor in the sample gas from condensing.
2. The in-containment gas concentration monitoring system of claim 1, wherein:
the sampling module (2) is connected with the measuring module (7) through a penetrating piece (5) and a composite pipeline (6), the penetrating piece (5) penetrates through the containment (1), the composite pipeline (6) is located outside the containment (1), the top end of the composite pipeline (6) is connected with the penetrating piece (5), and the tail end of the composite pipeline (6) is connected with the measuring module (7);
the device is characterized by further comprising a backflow module (12) arranged outside the containment vessel (1), wherein the backflow module (12) is connected with the measurement module (7), the sample gas in the measurement module (7) returns to the containment vessel (1) through the backflow module (12), and the containment vessel (1), the sampling module (2), the penetrating piece (5), the composite pipeline (6), the measurement module (7) and the backflow module (12) form a closed loop;
the device is characterized by further comprising a purging module (17) arranged outside the containment vessel (1), wherein the purging module (17) is connected with the composite pipeline (6) and is used for purging and cleaning the sampling module (2).
3. The in-containment gas concentration monitoring system of claim 2, wherein:
the sampling module (2) comprises a plurality of sampling pipelines (4), the top end of each sampling pipeline (4) is provided with a sampling head (3), and the sampling heads (3) are arranged on measuring points at different positions in the containment (1);
the sampling pipeline (4) passes through the penetrating piece (5) and enters the composite pipeline (6), and the tail end of the sampling pipeline (4) is connected with the measuring module (7) in the composite pipeline (6);
sampling head (3) are equipped with aerosol filter equipment, radioiodine adsorption equipment, buckler and throttle pressure reduction means, aerosol filter equipment with radioiodine adsorption equipment is used for gas filtration and radioactivity to get rid of, the buckler is used for preventing water entering sampling head (3), throttle pressure reduction means is used for preventing to get into the vapor condensation of sampling head (3).
4. The in-containment gas concentration monitoring system of claim 3, wherein:
the measuring module (7) consists of a plurality of measuring units which are connected in parallel, and the measuring units correspond to the sampling pipelines (4) one by one;
each measuring unit comprises a measuring pipeline, the top end of the measuring pipeline is connected with the tail end of the sampling pipeline (4) in the compound pipeline (6), and the tail end of the measuring pipeline is connected with the backflow module (12);
the device also comprises a sampling valve group (8), a pressure reducing valve (9), a gas concentration sensor (10) and a flow controller (11) which are sequentially arranged on the measuring pipeline in series, wherein the sampling valve group (8) is close to the top end of the measuring pipeline; the pressure reducing valve (9) and the flow controller (11) are used for maintaining the sample gas passing through the measuring module (7) within set pressure and flow; the gas concentration sensor (10) adopts a high-temperature resistant design;
the heating, heat preservation and temperature control equipment is arranged in the measuring module (7), the internal environment temperature of the measuring module (7) can be monitored, the heating function is automatically turned on or off, the water vapor in the sample gas entering the measuring module (7) is prevented from being condensed, and the good operation environment and the measuring precision of the gas concentration sensor (10) are ensured;
the sampling valve group (8) in each measuring unit can be opened simultaneously in the sampling and measuring process so as to realize the function of simultaneously sampling and measuring a plurality of measuring points.
5. The in-containment gas concentration monitoring system of claim 4, wherein:
the gas concentration sensor (10) comprises a hydrogen analyzer (32), a water vapor analyzer (33) and an oxygen analyzer (34) which are arranged in series, and can measure the concentrations of hydrogen, water vapor and oxygen in real time;
the hydrogen analyzer (32) is connected with a hydrogen analyzer signal processing module (35), the water vapor analyzer (33) is connected with a water vapor analyzer signal processing module (36), and the oxygen analyzer (34) is connected with an oxygen analyzer signal processing module (37);
the hydrogen analyzer (32), the water vapor analyzer (33) and the oxygen analyzer (34) are concentration measuring devices of the corresponding analyzers and output electric signals related to the concentrations;
the hydrogen analyzer signal processing module (35), the water vapor analyzer signal processing module (36) and the oxygen analyzer signal processing module (37) are signal processing devices of corresponding analyzers, convert output electric signals into concentration signals and remotely transmit the concentration signals.
6. The in-containment gas concentration monitoring system of claim 5, wherein:
the backflow module (12) comprises a return pipeline (16), and a buffer tank (13), a compressor (14) and a stop valve (15) which are sequentially arranged on the return pipeline (16);
the buffer tank (13) is arranged at the top end of the return pipeline (16), the tail end of the measurement pipeline in the measurement module (7) is connected with the buffer tank (13), and the tail end of the return pipeline (16) extends into the containment (1) through the composite pipeline (6);
the compressor (14) is used for sending the sample gas back into the containment vessel (1);
the buffer tank (13) plays a role in buffering in the sampling and measuring process, the pressure and the flow rate of measurement are assisted to be stabilized, and the bottom of the buffer tank (13) is used for collecting condensed water of the water vapor component in the sample gas.
7. The in-containment gas concentration monitoring system of claim 6, wherein: the purging module (17) comprises a high-pressure nitrogen tank (19) and a plurality of purging pipelines, the purging pipelines correspond to the sampling pipelines (4) one by one, the top ends of the purging pipelines are connected with the high-pressure nitrogen tank (19), the tail ends of the purging pipelines are connected with the sampling pipelines (4) in the composite pipeline (6), a back purging valve group (18) is arranged on the purging pipelines, and high-pressure nitrogen is injected into the sampling pipelines (4) through the switch of the back purging valve group (18) to clean the sampling pipelines (4); the purge module (17) is capable of back-purging the sampling line (4) before and during a sample measurement to prevent a blockage of the sampling head (3).
8. The in-containment gas concentration monitoring system of claim 7, wherein:
the outermost layer of the composite pipeline (6) is an outer sheath (30), a second insulating layer (28) is arranged on the inner surface of the outer sheath (30), a heating cable (29) is arranged in the central position of the inner cavity of the composite pipeline (6), and the sampling pipeline (4) and the return pipeline (16) are arranged around the heating cable (29);
the heating cable (29) is used for preventing the water vapor in the sample gas from condensing; the sample gas is the sample gas in the sampling line (4) and the return line (16) within the composite line (6) during sampling.
9. The in-containment gas concentration monitoring system according to claim 8, wherein:
the top end of the penetrating piece (5) is located on one side of the inner surface of the containment vessel (1), a sealing head (20) is arranged for sealing the penetrating piece (5), and the tail end of the penetrating piece (5) is located on one side of the outer surface of the containment vessel (1); the top end of the composite pipeline (6) is connected to the tail end of the penetrating piece (5);
the penetrating piece (5) is cylindrical, the outermost layer of the penetrating piece is a horizontal sleeve (23), a first heat-insulating layer (27) is arranged on the inner surface of the horizontal sleeve (23), and the length of the first heat-insulating layer (27) is consistent with that of the penetrating piece (5);
a heating device (26) is arranged in the center of the inner cavity of the penetrating piece (5), and the sampling pipeline (4) and the return pipeline (16) are arranged around the heating device (26) and are not in contact with the first heat-preservation layer (27); the heating device (26) is used for preventing the water vapor in the sample gas from condensing; the sample gas is the sample gas in the sampling line (4) and the return line (16) within the penetration (5) during sampling;
the heating device (26) comprises a heating sleeve and a heating rod arranged in the heating sleeve, the heating sleeve and the heating rod are equal in length, and the heating sleeve extends to the position of the end socket (20);
a plurality of pipeline brackets (22) are arranged in the inner cavity of the penetrating piece (5) at intervals, and the sampling pipeline (4) and the return pipeline (16) are fixedly arranged in the inner cavity of the penetrating piece (5) through the pipeline brackets (22) and are not in contact with each other;
the temperature control device (25) is arranged in the penetrating piece (5) and used for measuring the internal environment temperature of the penetrating piece (5), if the temperature is lower than the requirement, the heating is automatically started, and if the temperature exceeds the requirement, the heating is automatically closed.
10. An in-containment gas concentration monitoring method for an in-containment gas concentration monitoring system according to claim 9, comprising the steps of:
a step S1 of cleaning the sampling line (4) of the sampling module (2) by means of the purge module (17); the penetration piece (5) and the composite pipeline (6) are subjected to preheating treatment;
step S2, sampling the gas in the containment (1) through the sampling module (2), and sending the sample gas into the measurement module (7) through the penetration piece (5) and the composite pipeline (6) for measurement; the process prevents the water vapor in the sample gas from condensing through a throttling depressurization device in the sampling module (2) and a heating, heat preservation and temperature control device in the penetration piece (5), the compound pipeline (6) and the measurement module (7), solves the fidelity problem of the sample gas and improves the measurement precision;
and step S3, after concentration measurement is finished, the sample gas is conveyed back into the containment (1) by using the backflow module (12) to form closed circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210125472.4A CN114689793A (en) | 2022-02-10 | 2022-02-10 | System and method for monitoring concentration of gas in containment vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210125472.4A CN114689793A (en) | 2022-02-10 | 2022-02-10 | System and method for monitoring concentration of gas in containment vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114689793A true CN114689793A (en) | 2022-07-01 |
Family
ID=82137717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210125472.4A Pending CN114689793A (en) | 2022-02-10 | 2022-02-10 | System and method for monitoring concentration of gas in containment vessel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114689793A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118642552A (en) * | 2024-08-14 | 2024-09-13 | 成都高真科技有限公司 | Temperature and humidity control device and method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378072A (en) * | 2001-03-30 | 2002-11-06 | 袁建波 | Anti-corrosive heat sampling composite tube |
| CN102323295A (en) * | 2011-09-30 | 2012-01-18 | 中广核工程有限公司 | System for monitoring concentration of hydrogen in containment vessel |
| CN204027882U (en) * | 2014-07-31 | 2014-12-17 | 安徽环瑞电热器材有限公司 | A kind of instrument is with analyzing anti-corrosive sample-taking tracing composite pipes |
| CN105513654A (en) * | 2016-01-18 | 2016-04-20 | 中国工程物理研究院材料研究所 | Device for rapidly measuring hydrogen at plurality of points after containment accident of nuclear power plant and realization method of device |
| WO2016091146A1 (en) * | 2014-12-08 | 2016-06-16 | 中广核工程有限公司 | Method, apparatus and system for measuring hydrogen concentration in containment vessel of nuclear power station |
| CN206310148U (en) * | 2016-12-16 | 2017-07-07 | 西安克罗格测控技术有限公司 | A kind of low-temperature resistance heat tracing sampling compound pipe |
| CN207052304U (en) * | 2017-06-07 | 2018-02-27 | 中国核电工程有限公司 | Gas concentration monitoring system in containment after a kind of reactor disaster |
| CN107967952A (en) * | 2017-10-27 | 2018-04-27 | 中国核电工程有限公司 | Gas concentration monitoring system and monitoring method in containment after reactor disaster |
| CN107993731A (en) * | 2017-11-06 | 2018-05-04 | 中国核电工程有限公司 | Gas flammability monitors system in containment after a kind of reactor disaster |
-
2022
- 2022-02-10 CN CN202210125472.4A patent/CN114689793A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378072A (en) * | 2001-03-30 | 2002-11-06 | 袁建波 | Anti-corrosive heat sampling composite tube |
| CN102323295A (en) * | 2011-09-30 | 2012-01-18 | 中广核工程有限公司 | System for monitoring concentration of hydrogen in containment vessel |
| CN204027882U (en) * | 2014-07-31 | 2014-12-17 | 安徽环瑞电热器材有限公司 | A kind of instrument is with analyzing anti-corrosive sample-taking tracing composite pipes |
| WO2016091146A1 (en) * | 2014-12-08 | 2016-06-16 | 中广核工程有限公司 | Method, apparatus and system for measuring hydrogen concentration in containment vessel of nuclear power station |
| CN105513654A (en) * | 2016-01-18 | 2016-04-20 | 中国工程物理研究院材料研究所 | Device for rapidly measuring hydrogen at plurality of points after containment accident of nuclear power plant and realization method of device |
| CN206310148U (en) * | 2016-12-16 | 2017-07-07 | 西安克罗格测控技术有限公司 | A kind of low-temperature resistance heat tracing sampling compound pipe |
| CN207052304U (en) * | 2017-06-07 | 2018-02-27 | 中国核电工程有限公司 | Gas concentration monitoring system in containment after a kind of reactor disaster |
| CN107967952A (en) * | 2017-10-27 | 2018-04-27 | 中国核电工程有限公司 | Gas concentration monitoring system and monitoring method in containment after reactor disaster |
| CN107993731A (en) * | 2017-11-06 | 2018-05-04 | 中国核电工程有限公司 | Gas flammability monitors system in containment after a kind of reactor disaster |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118642552A (en) * | 2024-08-14 | 2024-09-13 | 成都高真科技有限公司 | Temperature and humidity control device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110068428B (en) | Iodine adsorber leakage rate on-line measuring system and measuring method thereof | |
| CN114689793A (en) | System and method for monitoring concentration of gas in containment vessel | |
| CN106342210B (en) | A kind of for measuring the sampling analytical system of concentration of hydrogen in containment vessel | |
| CN107967952B (en) | System and method for monitoring gas concentration in containment after serious accident of reactor | |
| Mulvaney et al. | A commercial system for automated nitrogen isotope‐ratio analysis by the Rittenberg technique | |
| CN110867263A (en) | Experimental device and method for researching failure behavior of fuel element in severe accident of nuclear reactor | |
| CN102323295A (en) | System for monitoring concentration of hydrogen in containment vessel | |
| CN103383377A (en) | Testing and calibrating device for gas-dissolved-in-transformer-oil online monitoring system | |
| US11881321B2 (en) | Device for measuring total gas content of primary circuit of PWR nuclear power | |
| CN106226504B (en) | A kind of oil sample calibration device of Gases Dissolved in Transformer Oil on-Line Monitor Device | |
| CN108956440B (en) | Corrosion test device and method for liquid lead or liquid lead bismuth alloy | |
| CN202870044U (en) | Testing and calibrating device for online monitoring system of dissolved gas in transformer oil | |
| CA1134073A (en) | Failed element detection and location system and method for use in a nuclear reactor | |
| CN114113384A (en) | Power transformer body and on-load tap-changer integrated chromatographic on-line monitoring device | |
| US5235624A (en) | Method and device for detecting a leak from a fuel element of an assembly for a nuclear reactor | |
| CN211779063U (en) | Coal tar pitch sampling valve and online sampling system | |
| CN117405809A (en) | Real-time fault positioning and diagnosing method and system for oil chromatography on-line monitoring system | |
| CN111188920A (en) | Coal tar pitch sampling valve and online sampling system | |
| CN218180761U (en) | Automatic accurate preparation device of insulating standard oil | |
| CN111610545B (en) | High-range acid-proof I-129 radiation monitoring system and method | |
| CN203870989U (en) | Multi-point thermocouple bundle measuring acquisition device on basis of nuclear power station accident simulation system | |
| CN110931141B (en) | Passive containment heat export system debugging method | |
| CN112525623A (en) | Sampling device for gas concentration measurement | |
| CN204346773U (en) | Detect the sulfur hexafluoride sampler that pre reduction gathers gas and low absorbability | |
| CN218298008U (en) | Oil gas online monitoring equipment for oil-filled casing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |