The operating principle of a Liquid nitrogen production plant is as follows:
Atmospheric air is drawn in and pre-treated, passing through filters to remove dust and other particulate matter. The air then enters a compression system, where it is compressed to a certain pressure (typically 5-7 bar) and cooled by cooling equipment. The compressed air then enters a purification stage, where molecular sieves and other purification equipment remove impurities such as moisture, carbon dioxide, and hydrocarbons to prevent these substances from freezing and clogging equipment in the subsequent low-temperature environment. The purified air then enters a heat exchanger, where it exchanges heat with the cryogenic gas generated in subsequent processes, gradually cooling it to near its liquefaction temperature. The air then enters an expander or liquefier, where it is further cooled through processes such as adiabatic expansion, reaching its liquefaction point (approximately -196°C, the boiling point of nitrogen), converting it into cryogenic liquid air. The liquid air is then fed into a distillation column (typically a dual-pressure, high- and low-pressure system), where it undergoes distillation separation through repeated evaporation and condensation. Since the boiling point of nitrogen (-196°C) is lower than that of oxygen (-183°C), nitrogen evaporates more easily and rises to the top of the tower. After being collected and further cooled, it forms liquid nitrogen and is finally stored in a low-temperature insulated storage tank, completing the entire production process.
Nitrogen Applications:
In the chemical industry:
Nitrogen is a vital raw material gas. It is a key component in the production of fertilizers (such as nitrogen fertilizer), providing sufficient nutrients for agricultural production. It is also used in the production of nitric acid, a fundamental raw material for synthetic nylon, dyes, explosives, and other chemical products, driving the expansion and development of the chemical industry chain.
In the food industry:
Nitrogen's inertness makes it an ideal food preservative. Injecting nitrogen into food packaging isolates oxygen, preventing oxidation and bacterial growth, thereby effectively extending the shelf life of the food. It is particularly suitable for preserving puffed foods such as potato chips and biscuits, as well as meat and pastries, while maintaining the original texture, flavor, color, and moisture of the food. Furthermore, as mentioned above, liquid nitrogen (the liquid form of nitrogen) is also widely used in food rapid freezing.
Why choose us?
Choosing NEWTEK stems from nearly 40 years of expertise and comprehensive service capabilities. Since our founding in 1987, we have specialized in air separation and cryogenic technology. This dedication has enabled us to accumulate technical experience spanning four generations of equipment, from early basic separation units to today's intelligent gas systems, and establish a comprehensive solution portfolio covering oxygen, nitrogen, argon, carbon dioxide, and specialty gases.
As a leading global integrated gas company, we offer customized designs for high-purity oxygen systems required for steelmaking, ultra-high-purity nitrogen plants for the electronics industry, and integrated specialty gas solutions for the chemical industry. Our core competency is "one-stop turnkey engineering"-from initial site surveys and capacity planning to equipment R&D, manufacturing, installation, and commissioning, and ultimately, personnel training and ongoing maintenance-without requiring clients to rely on third parties.
FAQ
1. What gas solutions can be customized?
We offer a full range of customized solutions for oxygen, nitrogen, argon, carbon dioxide, and specialty gases.
2. Can we meet the customization needs of different industries?
Yes, we can precisely match the needs of various industries, including steelmaking, electronics, and chemicals.
3. What processes does our customization service include?
A: We provide a one-stop service from site survey and capacity planning to equipment R&D, manufacturing, installation, commissioning, and lifelong maintenance.
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