Introduction to the application of nitrogen in various industries

Oil and gas industry: nitrogen filling anti-oxidation or nitrogen purging of pipeline containers in petroleum refining systems, storage tank nitrogen filling, replacement, leak detection, flammable gas protection, etc. Gas purity: 99.9%, gas pressure 0.75MPa.

Oil recovery and refining: increasing recovery efficiency and maintaining pressure on oil depots and gas storages; Inert gas protection storage tanks and loading/unloading products; purging pipelines; G as purity: ≥99.9%, gas pressure 0.75MPa.

Oil exploitation, gas production: oil extraction by injecting nitrogen into the oil layer can improve oil recovery and create significant economic benefits; injecting nitrogen into the coal seam and collecting methane gas (gas) can increase methane production and extend coal seam production life. Gas purity: 99.9%, pressure 0.6 to 0.85MPa.

Chemical industry: nitrogen blanketing, replacement, cleaning, pressure transport, chemical reaction agitation, chemical fiber production protection; synthetic fiber nitrogen-filled binder, wiring and oxidation prevention. Gas purity: 98 ~ 99.99%, gas pressure 0.5 ~ 0.7MPa.

Chemical process: Used for inert protective containers and oxygen-sensitive chemicals to reduce safety hazards by creating an oxygen-deficient environment; driving liquids through pipes; and manufacturing ammonia. Gas purity: 99.9 ~ 99.99%, gas pressure 0.5 ~ 0.7MPa.

Polyester fiber: using pure nitrogen blowing, measuring the liquid level of the ethylene glycol raw material in the high temperature and low temperature reaction kettle, measuring the pressure difference between the high pressure end and the low pressure end, and then conveying the standard signal, and converting into the liquid level height. Pure nitrogen is used to measure the pressure of the vacuum system and the filter is backflushed in the PPA process. Gas purity: 99.9 ~ 99.9995%, gas pressure 0.5 ~ 0.55MPa.

Rubber tires: high-pressure molding anti-oxidation, using pure nitrogen instead of water vapor to pressurize the capsules in the production process, which can effectively improve the service life of the capsules and greatly reduce manufacturing cost. Gas purity is 99.9 to 99.999%, and the gas pressure is 2. 5 MPa after pressure compression.

Float glass: gas protection during production, anti-tin bath oxidation; used to cool the electrode of the furnace and prevent oxidation during manufacturing; also used to reduce air temperature to achieve optimal cooling efficiency.

Coal industry: Underground explosion-proof and coal-fired fire-fighting, injecting a certain amount of nitrogen into the oxidation zone or the fire zone to reduce oxygen content to 10% or less, to achieve the purpose of fire prevention. Its function is to eliminate the danger of gas explosion; prevent natural heat and spontaneous combustion of coal; reduce combustion intensity; Gas purity: 97% ~ 98%, gas pressure 0. 6MPa.

Flammable and explosive product protection: to prevent the dust explosion in warehouses and wells, transportation and storage of ammunition; Gas purity: 97 ~ 98%, the gas pressure 0. 6MPa.

Heat treatment: In the heat treatment process of bright annealing, bright quenching, bright tempering, etc., protective gas and safety gas are provided for the industrial furnace to prevent the oxidation of the product; in carburizing and nitriding process, nitrogen is usually used for the furnace to be purged. Gas purity is generally 99.5 to 99.9995%, and gas pressure is 0.1 to 0.6 MPa.

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