Methyl iodide gas sampling system applicable to high pressure steam pipeline environment

Abstract

The invention aims at providing a methyl iodide gas sampling system applicable to a high pressure steam pipeline environment. The methyl iodide gas sampling system comprises a mixing steam depressurization part, a mixing steam cooling part, a gas sample collecting part and a waste gas recovery part. The mixing steam depressurization part comprises a sampling section, a heating section and a connecting section which are sequentially connected; the mixing steam cooling condensation part comprises a condenser and a liquid condensation tank which are communicated; the gas sample collecting part comprises a steam-water separation device, a sampling steel cylinder and a flowmeter which are sequentially connected; and the waste gas recovery part comprises a water scrubber and a fan. The methyl iodide gas sampling system is safe and reliable and can well meet requirements of system performance testing.

Description

technical field [0001] The invention relates to a gas sampling system, in particular to a gas sampling system under high pressure environment. Background technique [0002] The containment shell of a nuclear power plant is the last barrier to prevent the release of radioactive substances to the environment. In the event of a serious accident in which the core melts through the pressure vessel, the molten core reacts with the concrete floor to generate a large amount of radioactive aerosols, iodine and organic iodine. Organic iodine is mainly represented by methyl iodide. As the accident progresses, the pressure inside the containment gradually increases, and when it exceeds its safety limit, the integrity of the containment will be threatened. The containment filtration and discharge system uses active pressure relief to reduce the pressure inside the containment, and at the same time to filter the radioactive substances in the exhaust gas, one of the more important substan...

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Problems solved by technology

In the patent application number 200580035239.1, a method and a sampling system for sampling from the atmosphere in the reactor safety vessel of a nuclear device are disclosed, which can realize the collection of mixed gas samples containing steam under pressure conditions, and are especially suitable for single Gas sample collection under the requirements of point measurement, but for the use requirements of this experiment, it is necessary to ensure that the sample gas collected at the position before and after filtration is in the same physical state. In actual working conditions, the steam content of the mixed gas in the pipeline before and after filtration is not the same , but the method and system mentioned in the above patent cannot adjust and process the state parameters of the gas, and cannot meet the requirements of this experiment. In addition, the structure of the above system is relatively complicated, requiring the use of sensors, electronic units and process control devices. poor

In the patent application number 200910089514.8, a multifunctional gas sampling system and sampling method are disclosed, which can realize the drying and collection of gas samples in an environment containing a certain humidity, but it cannot be used under high-pressure steam conditions , can not meet the measurement requirements of this experiment

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