What is anti-surge in compressor?

What is anti-surge in compressor?

The anti-surge controller protects the compressor from surge by continuously calculating the distance between the compressor’s operating point and its surge limit line.

What causes surge in compressor?

Surge occurs when there is no forward flow of gas through the compressor and a reversal of flow occurs. The gas that is being compressed gets pushed backward through the centrifugal compressor. When this surge (flow reversal) occurs, which can happen in milliseconds, the rotor is affected.

What is used to protect a compressor from surging?

Anti-Surge Control Systems It is normally achieved by opening a control valve in a recycle line (Anti-Surge Control Valve or ASCV), returning the discharge gas to the inlet of the compressor via a suction cooler. The resulting increase in compressor inlet volume flow moves the operating point away from surge.

What is an anti-surge?

The basic function of anti-surge control is to maintain a minimum flow during extreme conditions. Using measurements from suction and discharge pressure, discharge pressure and temperature, and either suction or discharge flow, the anti-surge controller determines the flow at which the condition of surge will occur.

What is choking in compressor?

Choking is the condition which occurs in the compressor in which it operates at a very high mass flow rate and flows through the compressor can’t be further increased as mach number at some part of the compressor reach to unity i.e. to sonic velocity and the flow is said to be choked.

What are anti-surge valves?

The anti-surge valve is a surge relief valve which is a kind of valve that can be used to do the surge control. Anti-surge valve can be considered as a dedicated control system which is capable to act as a surge controlled with great response time.

What is the surge pressure?

Surge pressure, or “water hammer,” is a short-term increase in pressure due to a change in fluid velocity in a pipeline.

What is surge in compressors How do you detect and control it?

Compressor surge is a form of aerodynamic instability in axial compressors or centrifugal compressors. The term describes violent air flow oscillating in the axial direction of a compressor, which indicates the axial component of fluid velocity varies periodically and may even become negative.

How do you calculate surge pressure?

The maximum surge pressure that occurs in a liquid pipeline when a valve is suddenly closed may be quickly determined by using the simple rule of thumb: Line pressure equals 0.8 times the weight per cubic foot of liquid times its velocity in feet per second.

What is surge in axial compressor?