Nitrogen generation control systems and methods for controlling

Details Nitrogen generation control systems and methods for controlling Nitrogen generation control systems and methods for controlling

1995-03-09

1997-07-22

Spitzer, Robert

Gas separation: processes

With control responsive to sensed condition

Concentration sensed

95 54, 96 8, 96 10, 55218, 426419, B01D 5322

Patent

active

056499957

ABSTRACT:
A nitrogen generation control system and method are provided for controlling levels of nitrogen and oxygen in a controlled atmosphere within a container for perishable goods. The nitrogen generation control system has a nitrogen generator that controllably generates an amount of nitrogen, while releasing oxygen as an off gas. The nitrogen is injected into the container to create a controlled environment. A sample analyzer subsystem is connected to the container to extract a sample of gases from the controlled environment and analyze the oxygen content. The control system further includes a cascaded, dual control loop controller coupled to the nitrogen generator and sample analyzer subsystem. The controller has a nitrogen generation control loop to control the amount of nitrogen generated by the nitrogen generator in response to variation between the oxygen released during nitrogen generation and a reference amount of oxygen. The controller also has a container atmosphere control loop to control the reference amount of oxygen used as a control input to the nitrogen generation control loop in response to variation between the actual oxygen content in the container and a preselected oxygen level desired to be present in the container.

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