China PSA Nitrogen Generators technology assures quick returns on your investment and stable year-to-year gas costs.
When selecting the most appropriate nitrogen-production process, several parameters should be considered. Purity and capacity are the most important factors that can affect the choice of production methodology, and hence, have a direct impact on the unit cost of the nitrogen produced. The use of a PSA nitrogen-generation system, which can be designed to meet all types and patterns of nitrogen flow — steady, periodic and erratic — has grown in popularity during the last several decades, thanks to the simplicity, performance, flexibility, reliability and relatively low capital and operating costs of this production route.
However, the optimal nitrogen-production rate using a PSA system based on CMS pellets is around 3,000 Nm3/h of N2 produced (>95% purity). Within that range, PSA is a more economical option than O2/N2-separation by air liquefaction and cryogenic separation, or by membrane-based separation.
A vessel containing carbon molecular sieve, or CMS, is filled with compressed air. The smaller oxygen molecules are adsorbed by the sieve material while the larger nitrogen molecules drift past and are collected in a nitrogen receiver.
Pressure is then released from the vessel, and the oxygen molecules are vented to the atmosphere. At the same time, the cycle is repeated in a second ves.