The VPSA nitrogen generating system works on the pressure change principle. Containers filled with carbon granulate separate the oxygen and thus reduce the oxygen content in the air. The granulate consists of specially treated active carbon which enables the separation of oxygen and nitrogen.
The compressed ambient air enters an adsorption tank via an energy-efficient low-pressure compressor. The tank contains the carbon granulate which retains the smaller oxygen molecules from the air in its pores. The nitrogen can thus flow past and is thereby separated from the oxygen. One cycle lasts approx. 60 seconds and includes the nitrogen separation in a tank (adsorption) and the removal by vacuum pump of the bound oxygen in a second tank (resorption). As this process is continuously, alternately repeating itself, nitrogen is permanently available for introduction into the protected area.
Thanks to low process pressures the VPSA nitrogen reduction system is very energy-efficient. The reduction of system pressure immediately leads to an effective lowering of energy consumption. In direct comparison with conventional oxygen reduction systems the energy costs can be reduced by up to 70%. In addition to this, the lower process pressure protects components and carbon granulate, thereby reducing component wear.
The modest dimensions of the VPSA make it possible to implement the entire oxygen reduction system as a container solution. This saves valuable space in buildings.
The scalable design allows individual quantities to be supplied. From quantities upwards , the modular design offers built-in partial redundancy. If a module is being serviced or is possibly completely out of service, part of the quantity supplied will still be available. Often this is sufficient to maintain fire protection or if necessary to gain enough time to restore complete fire protection.