What are the leak prevention detection methods for helium flow meters in thermal systems

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1. A helium gas recovery system that can improve purification recovery rate and purity. The system is mainly implemented through the following technical solutions: the system includes a flow meter, a primary filter, a vacuum pump, a compressor, a precision filter, a first buffer tank, an adsorption system, a second buffer tank, and a low-temperature tower that are connected in a targeted manner. This series of devices work together to efficiently recover and purify helium gas from industrial helium exhaust. Flow meter: As the inlet of the system, a mass flow meter is used to accurately control and regulate the flow of raw gas, ensuring the stability and efficiency of subsequent processing. Primary filter: Preliminarily filters large particulate impurities in the raw gas to protect subsequent equipment from damage. Vacuum pump: Creating the necessary vacuum environment in the system to facilitate subsequent gas separation and purification processes. Compressor: A piston compressor is used to compress the raw gas, increase the gas pressure, and facilitate subsequent processing. Precision filter: Parallel two-stage precision filters are used to further remove small impurities from the raw gas, ensuring the quality of the gas entering the adsorption system. A buffer tank: As a gas buffer and storage device, it balances system pressure and stabilizes gas flow. Adsorption system: The core part of the system, which includes at least two sets (in this case, four sets) of adsorption columns connected in series. These adsorption columns use specific adsorption materials to remove carbon dioxide, halogen gases, and water from the raw gas, reducing the carbon dioxide content to 0.2 ppm and water content to 1 ppm in the purified gas, and effectively removing halogen gases. In addition, the adsorption system also includes a nitrogen heater, nitrogen flow meter, and muffler to assist the adsorption process and reduce noise. CO catalytic system (optional): A CO catalytic system added between the first buffer tank and the adsorption system, used to convert CO in the feed gas into carbon dioxide and further purify the gas. The system includes a heat exchanger, heater, catalytic bed, and cooler to ensure the stability and efficiency of the catalytic process. Second buffer tank: Once again serving as a gas buffer and storage device, it provides a stable gas supply for the low-temperature tower. Low temperature tower: the final step in purifying helium gas within the system. At least three sets of heat exchangers connected in series are installed inside the low-temperature tower, and through low-temperature separation technology, the purity of purified helium gas reaches over 99.999%. At the same time, a vacuum pump is also installed on the low-temperature tower in the state to extract light component impurity gases and further purify helium gas. System advantage: High purification recovery rate: By optimizing equipment configuration and process flow, the system can achieve a purification recovery rate of over 99%, far exceeding the 85-90% of conventional membrane separator systems. High purity: The low-temperature separation technology inside the low-temperature tower, combined with the accurate purification of the adsorption system, enables the final helium gas purity to reach over 99.999%, meeting the requirements of high-precision applications. Wide applicability: This system has a wide range of raw gas sources and can be used for industrial helium

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