A hybrid nitrogen gas generation system includes a membrane nitrogen gas generator and a pressure swing absorption nitrogen generator. A gas comprising nitrogen is purified to a first nitrogen purity using one of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator. The gas is either bypassed around the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator to provide the gas having the first nitrogen purity or the gas is purified to a second nitrogen purity using the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator.

A closed-loop nitrogen transport system including a first transfer line configured for nitrogen pressure conveyance of a polymer fluff from at least one upstream vessel to at least one downstream vessel, a second transfer line configured to return a nitrogen gas stream comprising primarily nitrogen from the at least one downstream vessel to the at least one upstream vessel, a conveyor blower operable to provide flow throughout the closed loop, and a treatment unit operable to remove hydrocarbons from at least a portion of the nitrogen gas stream comprising primarily nitrogen, to provide a purified nitrogen stream.

An apparatus/system for generating a high-purity nitrogen gas using a fuel cell includes; a fuel cell that operates by taking in air or a gas containing nitrogen and oxygen, and a fuel gas; a dehumidification mechanism that reduces moisture or water vapor content in an exhaust gas that is extracted from the fuel cell and has a lower oxygen concentration than air; and a filtering mechanism which includes a filter using fibers having different degrees of permeation for nitrogen and oxygen and converts the exhaust gas having a reduced moisture or water vapor content into a gas having an increased nitrogen concentration. The filter recovery ratio is higher when an oxygen concentration of a gas to be filtered is lower. The dehumidification mechanism is a pump unit including a water seal pump to provide an adiabatic expansion chamber in which the exhaust gas extracted from the fuel cell expands adiabatically.

A hybrid nitrogen gas generation system includes a membrane nitrogen gas generator and a pressure swing absorption nitrogen generator. A gas comprising nitrogen is purified to a first nitrogen purity using one of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator. The gas is either bypassed around the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator to provide the gas having the first nitrogen purity or the gas is purified to a second nitrogen purity using the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator.

An apparatus and method for nitrogen production from compressed air. The apparatus is a portable compact unit including a compressed air input, a nitrogen generator configured to receive compressed air from a compressor through the compressed air input, a nitrogen storage vessel configured to store pressurized nitrogen, and a compressor failure monitor disposed between the compressed air input and the nitrogen generator. The compressor failure monitor can be in combination with an air dryer device, wherein the compressor failure monitor is configured to monitor a change in air pressure and/or air temperature at or from the air dryer, which can indicate compressor issues.

A system for recovering nitrogen during regeneration of a treater, the system including an adsorbent bed downstream of the treater, wherein the adsorbent bed comprises an adsorbent operable to adsorb at least one impurity from a treater bed regeneration effluent stream comprising nitrogen to provide a nitrogen product having a higher nitrogen purity than a nitrogen purity of the treater bed regeneration effluent stream. A method for recovering nitrogen during regeneration of a treater is also provided.

A closed-loop nitrogen transport system including a first transfer line configured for nitrogen pressure conveyance of a polymer fluff from at least one upstream vessel to at least one downstream vessel, a second transfer line configured to return a nitrogen gas stream comprising primarily nitrogen from the at least one downstream vessel to the at least one upstream vessel, a conveyor blower operable to provide flow throughout the closed loop, and a treatment unit operable to remove hydrocarbons from at least a portion of the nitrogen gas stream comprising primarily nitrogen, to provide a purified nitrogen stream.

Systems and processes for use of concentric adsorbent beds with rotary valve assemblies are provided.

A system for recovering nitrogen during regeneration of a treater, the system including an adsorbent bed downstream of the treater, wherein the adsorbent bed comprises an adsorbent operable to adsorb at least one impurity from a treater bed regeneration effluent stream comprising nitrogen to provide a nitrogen product having a higher nitrogen purity than a nitrogen purity of the treater bed regeneration effluent stream. A method for recovering nitrogen during regeneration of a treater is also provided.

An apparatus/system for generating a high-purity nitrogen gas using a fuel cell includes; a fuel cell that operates by taking in air or a gas containing nitrogen and oxygen, and a fuel gas; a dehumidification mechanism that reduces moisture or water vapor content in an exhaust gas that is extracted from the fuel cell and has a lower oxygen concentration than air; and a filtering mechanism which includes a filter using fibers having different degrees of permeation for nitrogen and oxygen and converts the exhaust gas having a reduced moisture or water vapor content into a gas having an increased nitrogen concentration. The filter recovery ratio is higher when an oxygen concentration of a gas to be filtered is lower. The dehumidification mechanism is a pump unit including a water seal pump to provide an adiabatic expansion chamber in which the exhaust gas extracted from the fuel cell expands adiabatically.