Method for detecting the occurrence of surge in a centrifugal compressor
US5971712A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | May 22, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D27/001
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for detecting the occurrence of surge in a centrifugal compressor includes the step of calculating a time rate of change of a discharge pressure of the fluid discharged from the compressor. In one preferred embodiment, the time rate of change of the discharge pressure is calculated by initially setting PREV PRESS and RATE PRESS variables equal to zero (0), and commencing a RATE PRESS subroutine having a time limit for cycling therethrough. The RATE PRESS subroutine includes the steps of obtaining a discharge pressure reading for the fluid discharged from the compressor, subtracting the discharge pressure reading from the PREV PRESS variable to establish the RATE PRESS variable, and resetting the PREV PRESS variable equal to the value of the discharge pressure reading. After the RATE PRESS variable has been determined, the RATE PRESS is compared with an acceptable set time point rate of change for the discharge pressure. If the calculated value of the time rate of change of the discharge pressure is greater than or equal to the acceptable set point time rate of change for the discharge pressure, then a surge detection subroutine having a time limit for cycling therethrough …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.