Cabinet Nitrogen Generator

Bigger Size Nitrogen Generator, used in oil field and other portable situation.

Process Description of the Nitrogen Generator
Ambient air is compressed by an air compressor, after preliminary cleaning in the pre-filter, the compressed air is subsequently dried by refrigeration dryer and purified by a secondary filter, and thirdly carbon activated filter to ensure a qualified air for the adsorption.
The purified compressed air is then send to the air buffer to compensate the air flow and the pressure fluctuation, compressed air then goes from the air buffer to the adsorption tower filled with carbon molecular sieve (CMS). To obtain a continuous product gas flow one nitrogen generator with two adsorption vessels filled with carbon molecular sieve (CMS) are provided.
Before the equilibrium load is reached at the top of the adsorption bed, the air supply is interrupted and, thus a nitrogen break-through is prevented. The vessels of each generator are alternatively loaded, thus producing nitrogen. If one adsorber is loaded, simultaneously the other adsorber is regenerated by pressure decrease (desorbing). Prior to both adsorption and desorption, a pressure equalization opposite to the flow direction takes place, thereby, the regenerated vessel is preloaded by a gas poor in nitrogen.
After the subsequent pressure equalization, the vessel will be regenerated (desorbed). The pressure decrease (depressurisation) required for regeneration is obtained by venting to the atmosphere.
The Nitrogen coming out of the adsorbers passes via a control valve to the nitrogen receiver, which compensates the varying flow during changeover in order to allow a continuous supply of Nitrogen. Furthermore, the nitrogen purity which is changing during the adsorption step is equalized in this nitrogen receiver.
The purity of the produced Nitrogen will be monitored continuously by means of a residual oxygen analyser. As soon as the residual oxygen content exceeds a preset threshold, the production line will be shut off and the produced Nitrogen will be blown off to the atmosphere. In the meantime the system will try to get restore the original process conditions.
Change-over of the adsorbers as well as the complete automatic control of the PLANT is effected by electric control systems, enclosed in the Control Panel of the nitrogen generator. Nitrogen production will be switched on and off automatically according to BUYERs nitrogen consumption profile.