초록 ▼

A PSA (pressure swing adsorber) system for producing high purity nitrogen from compressed air containing a pressure swing dryer to dry the compressed air arranged for regeneration by oxygen enriched desorption effluent gasses from the PSA towers. A product nitrogen purge assists in desorption of the

A PSA (pressure swing adsorber) system for producing high purity nitrogen from compressed air containing a pressure swing dryer to dry the compressed air arranged for regeneration by oxygen enriched desorption effluent gasses from the PSA towers. A product nitrogen purge assists in desorption of the PSA towers and leads to improved yield. The system is characterized by capability for yields of 99.5% nitrogen plus argon to exceed about 25% and an efficiency of about 60 volumes of the 99.5% product per volume of adsorbent per hour.

대표청구항 ▼

In a process for generating high purity nitrogen from compressed air by a pressure swing multi-tower adsorption system operated through successive adsorption and desorption cycles the improvements which comprise purging the tower undergoing desorption with from 5-30% of the high purity nitrogen offt

In a process for generating high purity nitrogen from compressed air by a pressure swing multi-tower adsorption system operated through successive adsorption and desorption cycles the improvements which comprise purging the tower undergoing desorption with from 5-30% of the high purity nitrogen offtake from the tower producing nitrogen through adsorption and drying the compressed air in a pressure swing solid desiccant twin tower air dryer, employing oxygen enriched gas effluent from desorption of the multi-tower adsorption system at ambient pressures for desiccant regeneration purposes in the twin tower air dryer. In an apparatus for producing high purity nitrogen including a pressure swing multi-tower adsorption system with a length to diameter ratio of the towers in said adsorption system from 3.5:1 to 10:1, operated through successive adsorption and desorption cycles and a source of compressed air therefor, the improvements which comprise: a cross-connection bleed line between the towers of said adsorption system adapted to pass from 5-30% of the high purity nitrogen leaving the tower producing nitrogen through adsorption into the top of the tower undergoing desorption; and a twin tower pressure swing solid desiccant air dryer between the compressed air source and said multi-tower adsorption system connected so as to feed dried compressed air to said multi-tower adsorption system for recovery of high purity nitrogen therefrom, and to receive ambient pressure oxygen enriched gas effluent therefrom for regenerating the desiccant in the air dryer.