Helium-rich tail gas recovering and purifying online circulating system for optical fiber production

Abstract

The invention discloses a helium-rich tail gas recovering and purifying online circulating system for optical fiber production. The system comprises a helium recovery unit, an initial membrane separating unit, a low-temperature purifying unit and a gas supply unit, wherein the recovery unit comprises a gas collecting tank, a pressurizing pump, a flowmeter and the like; the initial membrane separating unit comprises a precise filter, a membrane separator, a buffer tank and a purity detector; the low-temperature purifying unit comprises a pressurizing pump, a low-temperature purifier and a purity detector; the gas supply unit comprises a pressure adjusting valve and a pressure stabilizing tank; the low-temperature purifier consists of a refrigerator, a liquid collecting tank and a freezer. By adopting a mode of combining a single level membrane separation technology and a low-temperature purifying technology, online recovery and purification of helium-rich tail gas of an optical fiber cooling tube are realized. The purity of purified helium can reach over 99%, and purified helium can be secondarily fed to the user side for use, so that helium is recycled.

Description

technical field

[0001] The invention relates to the field of helium recovery systems in optical fiber production, in particular to an on-line circulation system for recovery and purification of helium-rich tail gas used in optical fiber production. Background technique

[0002] Helium is a scarce strategic resource. As one of the helium-poor countries, China has long relied on imports, so the rational allocation and application of helium resources is particularly important.

[0003] Helium has been widely used in aerospace, military, scientific research and other fields. With the development and growth of my country's industry, the consumption of helium in some industrial fields is also considerable, such as air conditioners, optical fiber cables, semiconductors and other industries. Industrial helium is generally directly consumed and discharged into the atmosphere, and the helium in the exhaust gas is not recovered, purified or post-treated. The reasons are generally th...

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