Differences between nitrogen produced by a nitrogen generator and bottled nitrogen
Release time:
2018-11-05
Differences between nitrogen produced by a nitrogen generator and bottled nitrogen
There are two main sources of nitrogen: liquid nitrogen from cylinders and nitrogen generated by a nitrogen generator (directly extracting nitrogen from the air).
Liquid nitrogen from cylinders (one ton of liquid nitrogen is equivalent to 780 m³ of effective nitrogen gas at normal temperature and pressure): Gaseous nitrogen is produced using large-scale nitrogen generation equipment, then processed under ultra-high pressure and ultra-low temperature (usually: 500 MPa, -180°C), converting it into liquid nitrogen; what we use {that is, inputting nitrogen into the furnace} is gaseous nitrogen, so before using liquid nitrogen, a gasification process is necessary: depressurization and heating. The several curved pipes connected to the liquid nitrogen storage tank are covered with ice and accompanied by a continuous white mist, which is the liquid nitrogen absorbing the surrounding temperature during gasification. However, in northern areas or colder regions, in winter, other facilities are needed to assist with liquid nitrogen gasification. In addition, the liquid nitrogen in the storage tank needs to be frequently replenished, which also creates trouble and pressure for procurement and transportation. At the same time, the overall investment is very large for long-term and large-scale use of liquid nitrogen.
There are three types of nitrogen generators: membrane separation nitrogen generators, PSA + purification device nitrogen generators, and PSA nitrogen generators:
Membrane separation nitrogen generator: The gas production per unit time is small (only suitable for single furnace), and the achievable nitrogen purity is relatively low (99.9%).
PSA + purification device nitrogen generator(i.e., "two-step method"): First, low-purity nitrogen (99.9%) is produced using PSA, then "hydrogen deoxygenation" (i.e., continuously inputting hydrogen and burning it to react with oxygen in low-purity nitrogen to obtain high-purity nitrogen: H2 + O2 = H2O) is used. This nitrogen generation method has a higher failure rate: PSA failure + "hydrogen deoxygenation" failure. The main failure points of "hydrogen deoxygenation": ignition device, cannot be interrupted, and hydrogen gas must maintain a stable flow rate.
PSA nitrogen generator (i.e., "one-step method"): Using different process technologies to directly produce high-purity nitrogen to fill the furnace. Different manufacturers have different technologies, the main differences are:
1. The achievable purity differs greatly: 99.9% - 99.999%;
2. The equipment failure rate differs greatly;
3. The difficulty of later maintenance and repair differs greatly;
4. There is also a difference in pressure drop (0.1-0.05 MPa);
Comparing the two nitrogen sources in terms of economy and convenience, nitrogen generators have obvious advantages; the "one-step" PSA nitrogen generator is the preferred choice.
Key words:
Related Support
Ruibang Nitrogen Purification Equipment Co., Ltd.
Telephone: 08613729920993
E-mail：ruibang@ruibang-n2.com
Address: No.5, Huaide Yayao Industrial Zone, Humen Town, Dongguan City, Guangdong Province
Sweep code attention
