Home > Valves > Valve System
File size: 2.1 MB
File type: pdf
Last download on: Sat May 25, 2013 03:23:46 PM
Surge is an aerodynamic flow instability which can lead to the catastrophic failure of the compressor system. One way to cope with this compressor flow instability is active control. For a laboratory-scale gas turbine installation, an active surge control system is proposed which consists of a plenum pressure sensor and a bleedhecycle valve. This work focuses on the selection of a control valve. More specifically, the required bandwidth and capacity of the valve are specified.
To study the influence of the control valve on system behavior, simulations are done with the Greitzer model which describes the behavior of the nonlinear compression system during surge. This model is extended with a control valve model which accounts for the control valve dynamics and the effect of valve saturation. A linear static output feedback controller is used to stabilize the compression system around its nominal operating point. The main contributions of this study are the following. First, a systematic approach is presented to determine the required bandwidth and capacity of a control valve for active surge control. Second, an efficient control strategy is applied: one-sided control. In this control strategy, the control valve is nominally closed and only opens to stabilize the system in its nominal operating point. Third, a stability analysis of the constrained linearized compression system is presented. Using the bounded static output feedback controller, surge limit cycles are stabilized in the nominal operating point. Stable operation can be sustained in this point with zero control valve mass flow if disturbances are absent. From simulations, the minimal bandwidth and capacity of the control valve needed for stabilization are determined. Surge point mass flow is seen to reduce by approximately 15% with the applied one-sided control strategy. Furthermore, it is concluded that nonlinear flow curves of the control valve are unfavorable for active surge control.
Bookmark or share this info on Google+ and leave comment at below :
People who downloaded this also viewed in this sites:
Valves are the most common single piece of equipment found in DOE facilities. Although there are many types, shapes, and sizes of valves, they all...
A Control Valve performs a special task, controlling the flow of fluids so a process variable such as fluid pressure, fluid level or temperature can...
Obj 9. Five types of directional control valves. Check valves; Rotary Valves; Pilot Operated Poppet Valves; Electro-hydraulic Valves; Spool Valves ...
Leave comment :
"Valve Selection for Compressor Surge Control"
Related Free Files
Valve Sizing Calculations... - Download: 337 times
VALVE SIZING SELECTION TECHNICAL REFERENCE... - Download: 386 times
Valve Selection Guide... - Download: 466 times
Valve Symbols ... - Download: 619 times
VALVE FUNCTIONS AND BASIC PARTS... - Download: 600 times
Hydraulic Valves... - Download: 470 times