Gas separation: processes – With control responsive to sensed condition – Concentration sensed
Patent
1997-12-19
1999-11-23
Spitzer, Robert
Gas separation: processes
With control responsive to sensed condition
Concentration sensed
95 11, 95 12, 95 15, 95 21, 95 22, 95 23, 95 96, 95121, 95139, 95143, 96111, 96112, 96113, 96130, B01D 53047
Patent
active
059893133
ABSTRACT:
A pressure swing adsorber (PSA) air prepurifier includes at least a first adsorber and a second adsorber and a controller for controlling air feed to the first adsorber and the second adsorber. The invention is a "realtime" method for controlling cycle times for each adsorber and includes the following steps. During a determined time period, flow is measured to an adsorber that is coupled to an air inlet. An actual totalized flow to the on-line adsorber is accumulated, based upon the measured flow values. During this time, air feed conditions (e.g., temperature, pressure, relative humidity) are monitored and periodically, a maximum totalized flow to the adsorber is calculated, determined, at least in part, based upon the monitored air feed conditions. Periodically, the actual totalized flow value is compared to a current calculated maximum totalized flow value and upon a predetermined relationship therebetween being reached, the on-line adsorber is decoupled from the air inlet and another adsorber is coupled thereto. The method for controlling cycle times for each adsorber also will take into consideration: variations in load demand, purge to feed ratio and upsets which occur on switching of adsorber beds.
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Follett Robert J.
Praxair Technology Inc.
Spitzer Robert
LandOfFree
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