Method and apparatus for preventing surge in a dynamic...

Details Method and apparatus for preventing surge in a dynamic... Method and apparatus for preventing surge in a dynamic...

F - Mech Eng,Light,Heat,Weapons

04

D

230/34

F04D 27/02 (2006.01)

Patent

CA 1291737

Abstract A method is disclosed for efficiently protecting dy- namic compressors from surge under changing inlet condi- tions and in response to flow disturbances of varying size and speed. An antisurge control system based on this disclosed method will compute the relative proximity of the compressor operating point to its surge limit as a multi-variable parameter which is self-compensated for changes in gas composition, inlet temperature and pres- sure, compressor efficiency, guide-vane position, and rotational speed. A combination of adaptive closed- and open-loop control responses is used to maintain a margin of safety between the operating point and the surge limit. Both the safety margin and the magnitude of the open-loop response are proportional to the rate at which the operating point approaches the surge limit, thus maximizing process efficiency.

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