A Sampling and Analysis System for Measuring Hydrogen Concentration in Containment Vessel

Abstract

A sampling analysis system for measuring the concentration of hydrogen in the containment vessel, comprising: a sampling pipeline, a transmission pipeline, a water vapor analysis sensor, a gas pretreatment unit, a hydrogen analysis sensor, a booster pump, a microprocessor, and a display unit; The gas in the containment is extracted by the sampling pipeline with thermal insulation treatment function, and the gas is processed to normal temperature and pressure by the pretreatment unit after passing through the water vapor analysis sensor, and the hydrogen volume in the pretreated gas is measured by the hydrogen analysis sensor Concentration, the microprocessor determines the current hydrogen volume concentration in the containment according to the measurement results of the sensor and outputs and displays it. It adapts to the use requirements of common gas analysis sensors and eliminates the influence of water vapor on the gas extraction measurement method in the containment by preprocessing the measured gas and combining with the preset algorithm program in the microprocessor. It is especially suitable for accurate measurement of the volume concentration of hydrogen or other explosive gas components in the containment under accident conditions of nuclear power plants.

Description

A Sampling and Analysis System for Measuring Hydrogen Concentration in Containment Vessel technical field The invention relates to a sampling analysis system for measuring hydrogen concentration, belonging to the technical field of gas concentration analysis and measurement. Background technique The gas composition in the containment of the nuclear power plant beyond the benchmark accident conditions and severe accidents is mainly air and water vapor, containing hydrogen and other gases, high-temperature and high-humidity mixed gas. Sources of hydrogen: 1) In the early stage of the accident, zirconium-water reaction produced hydrogen at a high rate; 2) In the middle and late stages of the accident, a large amount of hydrogen was also produced by the radiation decomposition of water, the reaction of core melt and concrete. Under accident conditions, the reactor emits a large amount of heat, and the temperature inside the containment vessel can reach as high as 180°C, and a ...

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Problems solved by technology

The 225CM hydrogen monitor adopts the "dry state" concentration measurement after cooling the gas in the containment vessel. Although the device has many advantages, with the deepening of research, the shortcomings of dry measurement are gradually exposed, that is, as mentioned in the previous analysis, The "dry" hydrogen concentration deviates from the real hydrogen concentration in the containment under high temperature and high humidity conditions

Nuclear power plants will only continuously monitor the hydrogen content in the containment under accident conditions. If accurate and reliable hydrogen concentration signals cannot be provided, it will increase the difficulty and time for nuclear power plant operators to make correct judgments and control, and even make wrong decisions. decision, it is very dangerous

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