The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2011
Filed:
Apr. 03, 2009
Jeremiah James Rauch, Clarence Center, NY (US);
Robert Leroy Baker, Williamsville, NY (US);
Gerald T. O'connor, West Seneca, NY (US);
Michael John Stanko, Grand Island, NY (US);
Murali Chinta, Toledo, OH (US);
Jeremiah James Rauch, Clarence Center, NY (US);
Robert Leroy Baker, Williamsville, NY (US);
Gerald T. O'Connor, West Seneca, NY (US);
Michael John Stanko, Grand Island, NY (US);
Murali Chinta, Toledo, OH (US);
Praxair Technology, Inc., Danbury, CT (US);
Abstract
The present invention provides a method and apparatus for generating refrigeration in a process operating at sub-ambient temperatures in which the refrigeration is generated by a turboexpander. The turboexpander is coupled to a generator controlled so that its speed is maintained at a setpoint through electromagnetic braking and its power output is maintained at line matching voltage and frequency. The speed control of the generator therefore, also controls the speed of the turboexpander. The setpoint is calculated to be equal to a product of an operational efficiency parameter, U/C, and a square root of twice the enthalpy drop in the flow passing through the turboexpander divided by a product of pi and a diameter of an impeller employed within the turboexpander.