CN-122017115-A - Method for detecting performance of catalytic plate of passive hydrogen compounder of nuclear power plant

CN122017115ACN 122017115 ACN122017115 ACN 122017115ACN-122017115-A

Abstract

The invention discloses a performance detection method of a catalytic plate of a nuclear power plant passive hydrogen compound device, which comprises the following steps of S1, constructing a multifunctional simulation experiment platform, S2, carrying out pre-experiment characterization on a catalytic plate sample to obtain pre-experiment characterization data, S3, placing the catalytic plate sample in the multifunctional simulation experiment platform, carrying out normal operation environment simulation and serious accident environment simulation in sequence, S4, taking out the catalytic plate sample after the normal operation environment simulation is finished, carrying out multi-dimensional performance index detection to obtain a first-stage detection result, taking out the catalytic plate sample again after the serious accident environment simulation is finished, carrying out multi-dimensional performance index detection to obtain a second-stage detection result, and S5, carrying out comprehensive performance evaluation on the catalytic plate sample based on the detection result. The invention can comprehensively simulate the complex service environment of the full life cycle of the catalytic plate, and simultaneously verify the accident emergency capability and long-term durability of the catalytic plate, thereby providing more reliable equipment performance guarantee for the safe operation of the nuclear power plant.

Inventors

TIAN YAO
ZHOU SHUAI
Sun Jidie
WU JIANHUI
LIANG BIN
Zhan Huian
CHANG WEI
ZHAO GAOXIN
ZHU FUHENG
YUAN ZHIQIANG
NIU LIHONG
HE TINGYUAN

Assignees

阳江核电有限公司
中国船舶集团有限公司第七一八研究所

Dates

Publication Date: 20260512
Application Date: 20260121

Claims (10)

1. The method for detecting the performance of the catalytic plate of the passive hydrogen compounder of the nuclear power plant is characterized by comprising the following steps of: S1, building a multifunctional simulation experiment platform; s2, carrying out pre-experiment characterization on the catalytic plate sample to obtain pre-experiment characterization data; s3, placing the catalytic plate sample in the multifunctional simulation experiment platform, and sequentially performing normal operation environment simulation and severe accident environment simulation; S4, taking out the catalytic plate sample to perform multi-dimensional performance index detection to obtain a first-stage detection result after the normal operation environment simulation is finished; And S5, carrying out comprehensive performance evaluation on the catalytic plate sample based on the first-stage detection result and the second-stage detection result.
2. The method for detecting the performance of the passive hydrogen compounder catalytic board of the nuclear power plant according to claim 1, wherein the multifunctional simulation experiment platform in the step S1 comprises a reaction vessel, a compound environment control system and a multidimensional detection system; The composite environment control system is used for independently or cooperatively regulating and controlling the temperature, the relative humidity and the hydrogen concentration, and can generate concentration-controllable volatile organic compounds and dust aerosol; The multidimensional detection system is used for monitoring gas components, aerosol concentration, temperature, humidity and catalytic activity on line.
3. The method for detecting performance of a catalytic plate of a passive hydrogen recombiner in a nuclear power plant according to claim 2, wherein the composite environmental control system maintains the stability of the environmental state in the reaction vessel by adjusting the state parameters of the inlet gas and feeding back by using the sensors of the multi-dimensional detection system.
4. The method for detecting performance of a nuclear power plant passive hydrogen compounder catalytic plate according to claim 1, wherein the pre-experimental characterization in step S2 comprises at least one of the following analyses: Analyzing the types and the contents of the organic matters by adopting a gas chromatography-mass spectrometer; Characterizing the microscopic surface morphology by adopting a scanning electron microscope; adopting an X-ray diffractometer to analyze the phase composition and the crystal structure; the specific surface area was measured by BET nitrogen adsorption.
5. The method for detecting the performance of the catalytic plate of the passive hydrogen recombiner in the nuclear power plant according to claim 1, wherein the parameters of the normal operation environment simulation meet the conditions that the temperature is 30-50 ℃, the relative humidity is 50-80%, and the simulation duration is 30-90 days after the volatile organic compounds and dust aerosol are introduced; The parameters of the severe accident environment simulation meet the conditions that the temperature is 150-250 ℃, the relative humidity is 85-95%, the hydrogen concentration is 2-4%, and the volatile organic compounds and dust aerosol are introduced, wherein the simulation time is 24-72 hours.
6. The method for detecting performance of a catalytic plate of a passive hydrogen recombiner in a nuclear power plant according to claim 1, wherein the multi-dimensional performance index detection in step S4 includes: The detection of basic catalytic performance, namely evaluating catalytic activity by calculating hydrogen removal efficiency, wherein the hydrogen removal efficiency is not less than 25% and is qualified; Analyzing the adsorption type and content of the organic matters by a gas chromatography-mass spectrometer, and comprehensively evaluating the pollutant resistance and environmental adaptability of the catalytic plate sample by combining a scanning electron microscope to characterize microscopic surface morphology, the analyte phase composition of an X-ray diffractometer, a crystal structure and a BET nitrogen adsorption method to determine specific surface area to obtain experimental characterization data; And (3) detecting long-term stability, namely evaluating the long-term stability by carrying out continuous hydrogen catalytic cycle experiments on the catalytic plate sample for a plurality of times and calculating efficiency deviation, wherein the deviation value is less than or equal to 5% and is qualified.
7. The method for detecting performance of a catalytic plate of a passive hydrogen recombiner in a nuclear power plant according to claim 6, wherein the basic catalytic performance detection and the long-term stability detection are performed by introducing hydrogen with a concentration of 1% into the catalytic plate and monitoring the concentration change thereof after the normal operation environment simulation and after the severe accident environment simulation are completed.
8. The method for detecting performance of a catalytic plate of a passive hydrogen recombiner in a nuclear power plant according to claim 6, wherein the comprehensive performance evaluation in the step S5 is to establish a quantitative evaluation system, respectively assign weights to the three indexes of the basic catalytic performance, the anti-pollution performance and the long-term stability, and perform weighted calculation to obtain a comprehensive evaluation score.
9. The method for detecting performance of a nuclear power plant passive hydrogen recombiner catalytic plate according to claim 8, wherein in the quantitative evaluation system, the weight of the basic catalytic performance is 40%, the weight of the anti-pollution performance is 45%, and the weight of the long-term stability is 15%.
10. The method for detecting performance of a catalytic plate of a passive hydrogen recombiner in a nuclear power plant according to claim 8 or 9, wherein when the comprehensive evaluation score is equal to or more than 60, the catalytic plate sample is judged to meet the use requirement.

Description

Method for detecting performance of catalytic plate of passive hydrogen compounder of nuclear power plant Technical Field The invention relates to the technical field of performance detection of safety equipment of a nuclear power plant, in particular to a performance detection method of a catalytic plate of a passive hydrogen compounder of the nuclear power plant. Background The passive hydrogen recombiner is used as a core safety facility for ensuring the safe operation of the nuclear power plant, and a core component catalytic plate of the passive hydrogen recombiner is directly exposed to the atmosphere of the containment. During normal operation of a nuclear power plant, the environmental atmosphere in the containment is extremely complex and contains substances such as water vapor, volatile organic compounds, dust aerosols and the like in addition to air. The long-term contact of the catalytic plate with such complex environments is subject to the combined effect of multiple factors, namely, condensation of water vapor on the surface of the catalytic plate to form a liquid film which may cover the catalytically active components and reduce the ability to adsorb reactant molecules. Volatile organics may compete for adsorption or deposition of decomposition products on the catalytic surface. The soot aerosols may then clog the catalytically active sites or form a physical coating. These effects can gradually lead to the decrease of the catalytic activity and stability of the catalytic plate on hydrogen, and the hydrogen removal capability can be lost when serious, thus hidden danger is brought to the safe operation of the nuclear power plant. At present, the performance detection method for the passive hydrogen compounder catalytic plate has obvious limitations. The prior art focuses on simulating extreme environments such as high temperature, high humidity, high hydrogen concentration and the like under serious accidents so as to verify emergency response capability. Meanwhile, the existing detection index is single, and only the final result of hydrogen removal efficiency is usually focused, so that the performance attenuation rule and long-term durability of the catalytic plate in the actual service environment cannot be comprehensively and truly reflected. Disclosure of Invention The invention aims to solve the technical problem of providing a method for detecting the performance of a catalytic plate of a passive hydrogen compounder of a nuclear power plant. The technical scheme adopted for solving the technical problems is that a method for detecting the performance of a catalytic plate of a passive hydrogen compounder of a nuclear power plant is constructed and comprises the following steps: S1, building a multifunctional simulation experiment platform; s2, carrying out pre-experiment characterization on the catalytic plate sample to obtain pre-experiment characterization data; s3, placing the catalytic plate sample in the multifunctional simulation experiment platform, and sequentially performing normal operation environment simulation and severe accident environment simulation; S4, taking out the catalytic plate sample to perform multi-dimensional performance index detection to obtain a first-stage detection result after the normal operation environment simulation is finished; And S5, carrying out comprehensive performance evaluation on the catalytic plate sample based on the first-stage detection result and the second-stage detection result. Further, the multifunctional simulation experiment platform in the step S1 comprises a reaction container, a composite environment control system and a multidimensional detection system; The composite environment control system is used for independently or cooperatively regulating and controlling the temperature, the relative humidity and the hydrogen concentration, and can generate concentration-controllable volatile organic compounds and dust aerosol; The multidimensional detection system is used for monitoring gas components, aerosol concentration, temperature, humidity and catalytic activity on line. Further, the composite environment control system maintains the stability of the environment state in the reaction vessel by adjusting the state parameters of the inlet gas and feeding back by using the multi-dimensional detection system. Further, the pre-experimental characterization in step S2 includes at least one of the following analyses: Analyzing the types and the contents of the organic matters by adopting a gas chromatography-mass spectrometer; Characterizing the microscopic surface morphology by adopting a scanning electron microscope; adopting an X-ray diffractometer to analyze the phase composition and the crystal structure; the specific surface area was measured by BET nitrogen adsorption. Further, parameters of the normal operation environment simulation meet the conditions that the temperature is 30-50 ℃, the relative humidity is 50-80%, vola