Peripheral Air Supply System

There are various types of gases required for fiber optic preform factories, which can be divided according to their different uses: providing power (compressed air), reaction gases (high-purity oxygen, hydrogen, chlorine), combustion and combustion support (ordinary hydrogen and ordinary oxygen), blowing and cleaning (nitrogen), process gases (argon and helium), etc. The main quality requirements of each gas should comply with the provisions of Table 2.3.2-1.
Among them, compressed air directly utilizes the atmosphere, and through the compressor, it outputs high-pressure air with stable pressure through cooling, drying, dust removal, oil discharge, and pressure reduction processes. The gas supply system for other ordinary gases or high-purity gases can be divided into three ways according to the different usage:
On site gas production, transported by pipelines to gas consumption points;
Purchase liquid gas externally and supply gas after gasification;
Purchase gas cylinders or containerized cylinder sets for gas supply after depressurization.

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For the selection of ordinary gas or high-purity gas supply methods, a specific industrial enterprise should be determined based on factors such as the scale of the factory, gas consumption and quality requirements, as well as the local or surrounding gas conditions, after careful technical and economic comparison. In addition, various rod making processes inevitably generate a large amount of waste gas containing gas, hydrogen chloride, etc., which cannot be directly discharged into the atmosphere. A waste gas environmental protection treatment system should be equipped. This section will introduce the various gas supply methods mentioned above, as well as accessories such as pipelines and joints.

 

Table 2.3.2-1 Main Quality Requirements for Each Gas
Name Quality Requirements Application
Compressed Air Content ≤ 25mg/m
Particles (>0.25 μ m)<20pes/sef
Pressure 0.6MP
Normal pressure setting point -20 ℃		 Provide power
Nitrogen Purity 4N
Particles (≥ 0,25gm)<15pcs/sc
Pressure 0.5MPa~0.6MPa		 Washing and drying protection
Hydrogen Purity 4.5N
Particles (>0.25 μ m)<15pes/scf
Pressure 0.3MPa		 Maintain positive pressure or use ammonia as a protective gas
Nitrogen Purity 4.5N
Particles (>0.25 μ m)<15pes/scf
Pressure 0.3MPa		 Enhance heat conduction and improve deposition efficiency
Ordinary Hydrogen Gas Purity 3.5N
Pressure 0.4MPa~0.6MPa		 Burning provides energy
Ordinary Oxygen Purity 3.5N
Pressure 0.4MPa~0.6MPa		 Boosting combustion
High Purity Nitrogen Gas Purity 6N Carrier gas
High Purity Hydrogen Gas Bluntness 6N Provide energy and react with carrier gas
High Purity Oxygen Purity 6N Participate in oxidation reaction and carry gas
Oxygen Bluntness 5N Dehydration drying

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