Nitrogen production by PSA
The technology of pressure swing adsorption (PSA) allows to supply nitrogen at a purity of up to 6.0 / 1.0 ppm (residual oxygen) by quantity of 0,5 – 10.000 Nm³/h. The PSA technology is based on the separation of nitrogen and oxygen molecules from compressed dry air in an adsorption column filled by carbon molecular sieve (CMS).
The PSA process for nitrogen generation can be divided into two phases: pressurization/adsorption of oxygen and depressurization/desorption of oxygen. In the initial phase, the CMS adsorbs oxygen under high-pressure conditions and pure nitrogen leaves the column outlet as a product gas. In the second phase, the adsorber is depressurized to atmospheric pressure and oxygen molecules release the column. Typical PSA line consists of two adsorption columns, which are alternately charged with compressed air and de-pressurized. Thus the quasi-continuous process of nitrogen generation can be achieved.
Continuous measurement of temperature and pressure of compressed air as well as pressure and purity of nitrogen guarantees the required quality of product. Every PSA column is equipped by INMATEC touch control panel, which displays the measured values and allows operator to control the process directly at the unit or distantly.
Technical Data PSA*
| 1 Air compressor | |
|---|---|
| Inlet pressure | atm. |
| Inlet temperature | 30 °C |
| Relative Humidity | 70 % |
| Cooling water temperture | 27 °C |
| Outlet pressure | 9 bar |
| Productivity | 161,2 Nm³/h |
| Power consumption | 1028 kWh |
| 2 Puffer tanks for wet and dry compressed air | |
| Volume | 10.000 l |
| Max. pressure | 11 bar |
| Filtration of compressed air | |
| Max. temperature | 120 °C |
| Max. pressure | 16 bar |
| Particle removal | 0,01 micron |
| Max. oil carryover at 20°C | 0,01 mg/m³ |
| Compressed air dryer | |
| Dew point | 3 °C |
| Refrigerant | R407C |
| Nominal absorbed power | 14,23 kWh |
| 6 Buffer tanks before and after N2 generator | |
| Volume | 20.000 l |
| Max. pressure | 11 bar |
| 3 N2 generators | |
| Max. pressure of inlet compressed air | 10 bar |
| Purity | 99,99% |
| Productivity | 600 Nm³/h |
| *data based on the nitrogen generator with total nitrogen capacity of 1800 Nm³/h | |
References
| Company name / City | Country |
|---|---|
| Valcom Volgograd |  Russian Federation |
| Stroytransgaz Moscow | Russian Federation |
| Kuzocm Moscow | Russian Federation |
| Atlas Copco Moscow | Russian Federation |
| OAO Pigment Tambov | Russian Federation |
| Universal Pribor St. Petersburg | Russian Federation |
| DL Dannöhl Moscow | Russian Federation |
| Stroytransgaz II Moscow | Russian Federation |
| RHE Ivatsevichi | Russian Federation |
| Gazprom Izhevsk | Russian Federation |
| Gazprom Vladimir | Russian Federation |
| Gazprom Novogorko | Russian Federation |
| Gazprom Akademits | Russian Federation |
