On-line helium recycling method and device for optical fiber drawing system

Abstract

The invention discloses an on-line helium recycling method and a device for an optical fiber drawing system. The method comprises the steps of drying and filtering helium-rich gas collected in the optical fiber drawing system, performing preliminary purification on filtered dry chlorine to a first purity standard, returning part of the helium meeting the first purity standard to a cooling tube in the optical fiber drawing system for reuse, performing deep freezing purification on the rest part of the helium to a second purity standard, and returning the helium to a drawing furnace of the optical fiber drawing system for reuse. According to the method and the device, the purified helium is conveyed and purified separately due to the fact that the drawing furnace and the cooling tube in the optical fiber drawing system have different helium purity requirements; equipment requirements are reduced; at the same time, a utilization ratio of the helium is increased; the helium in the drawing furnace and the cooling tube is recovered; a recovery rate is increased; and the production cost of an optical fiber is lowered.

Description

technical field [0001] The invention relates to the field of optical fiber drawing, in particular to an online helium recycling method and device for an optical fiber drawing system. Background technique [0002] Helium is an inert gas, colorless, odorless, non-toxic and non-flammable at normal pressure and temperature. It has the characteristics of small molecular weight and good thermal conductivity. In the optical fiber drawing furnace, in order to protect the graphite parts in the furnace from being oxidized, and the high temperature in the furnace can be effectively transmitted into the interior of the optical fiber preform, a certain amount of helium is generally injected into the furnace during the optical fiber drawing process. It is about 35L / min. In the process of optical fiber drawing, in order to cool the optical fiber just out of the drawing furnace, a cooling tube is generally used to cool the optical fiber under the drawing furnace, and the heat exchange med...

AI Technical Summary

Problems solved by technology

If the helium in the furnace is not recovered and reused, it will cause waste, which will lead to an increase in manufacturing costs

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