Hydrogen concentration measuring device resistant to high temperature, high pressure, high humidity and radiation and hydrogen measuring probe

Abstract

The invention discloses a hydrogen concentration measuring device resistant to resistant to high temperature, high pressure, high humidity and radiation and a hydrogen measuring probe. The hydrogen measuring probe comprises a probe shell, a hydrogen measuring element and a fixing assembly, wherein the probe shell is provided with a hydrogen measuring inlet covered with a filter screen, the fixingassembly is used for fixing the hydrogen measuring element in the probe shell; and the hydrogen measuring element adopts a catalytic electrochemical mode to measure the hydrogen concentration, and comprises a measuring element shell internally provided with an insulating layer, a filtration permeable membrane, a measuring electrode, a counter electrode, a reference electrode, an electrolyte layer,an oxygen storage layer and a hydrogen measuring element lead, and the oxygen storage layer adopts a metal oxygen storage and oxygen release production material and can continuously release oxygen. The hydrogen concentration measuring device adopts the hydrogen measuring probe to measure the hydrogen partial pressure. The device is suitable for hydrogen concentration measurement in high-temperature, high-pressure, high-humidity and high-radiation environments of a nuclear power plant, and is also suitable for hydrogen concentration measurement in other severe environments.

Description

technical field [0001] The invention belongs to the field of hydrogen concentration measurement, and more specifically, the invention relates to a hydrogen concentration measurement device and a hydrogen measurement probe resistant to high temperature, high pressure and high humidity radiation. Background technique [0002] When a serious accident occurs in a nuclear power plant, a large amount of hydrogen will be produced in the containment, and the explosion of hydrogen will threaten the integrity of the safety barrier of the nuclear power plant. The sources of a large amount of hydrogen produced under the accident conditions of nuclear power plants are as follows: in the early stage of the accident, zirconium-water reaction produced hydrogen at a high rate; Lots of hydrogen. The accumulation of a large amount of hydrogen may cause the hydrogen concentration in the containment vessel to exceed the explosion limit of 4%, and there is a danger of explosion. In order to pre...

AI Technical Summary

Problems solved by technology

Therefore, nuclear power plants need to have a set of devices for measuring hydrogen concentration in severe accidents, but the environmental conditions in the containment are usually harsh during severe accidents, such as high temperature, high pressure, high radiation and other harsh environments, which are not conducive to the continuous monitoring of accidents by operators, making it difficult Use an effective method to monitor the hydrogen concentration, which has extremely high requirements for the equipment in the containment vessel

[0005] The first existing serious accident hydrogen concentration monitoring device uses the principle of catalytic reaction to indirectly measure the hydrogen concentration by measuring the heat of reaction, but this device can only be used in an aerobic environment, and the heat loss, reaction parts and catalytic reaction parts The distance affects the measurement accuracy, the hydrogen concentration measurement accuracy cannot be guaranteed, and the water droplets entering the catalytic unit under high humidity will also cause its measurement failure

[0006] The second existing serious accident hydrogen concentration monitoring device is to extract the gas out of the containment for measurement, but the measured parameters are difficult to accurately represent the inside of the containment after the radioactive gas is drawn out of the containment and then measured. The concentration of hydrogen gas will increase, and when the radioactive gas is pumped out of the containment, there will be a rupture of the sampling pipeline, which will further increase the leak point of the containment, and will also increase the risk of exposure of personnel outside the containment, and the safety is not high.

[0007] The third existing serious accident hydrogen concentration monitoring device uses a hydrogen concentration sensor based on the electrochemical principle of catalytic reaction to measure the hydrogen concentration, but the hydrogen concentration sensor based on the electrochemical principle of catalytic reaction has a high sensitivity to its semipermeable membrane and electrolyte. Due to the existence of liquid medium, it cannot withstand higher temperatures, and if concentrated sulfuric acid leaks, it will affect the surrounding environment

In addition, the hydrogen semi-permeable membrane used will affect the response time of the hydrogen concentration sensor, resulting in a slower response speed

[0008] The fourth existing severe accident hydrogen concentration monitoring device uses a hydrogen sensor based on the hydrogen absorption principle of a palladium-based alloy to measure the hydrogen concentration, but this device can only be measured under a given condition of temperature and pressure, and the non-continuous detection space In addition, the hydrogen concentration probe is exposed to high temperature and humid steam environment, and the steam may short-circuit its resistance measurement circuit or fail the measurement. The reliability of this measurement method is low

[0009] The existing fifth serious accident hydrogen concentration monitoring device uses electrochemical principles to measure the hydrogen concentration in high-temperature environments, but the PEEK material and diffusion film used have weak radiation resistance, so they cannot be directly used in high-irradiation environments , and the oxygen storage capacity is insufficient, after the oxygen is consumed during operation, it will affect the service life

Images