Refrigeration compressor anti-surge control

摘要

In a 'normal' gas compression circuit, the fluid that is compressed in the compressor, flowing in the immediate upstream and downstream process lines and vessels, is all in a gaseous phase without any change of state from liquid to vapour or from vapour to liquid. In this 'normal' gas compression circuit, the compressor could experience surge-inducing events due to changes in the process conditions downstream of the compressor (for instance, sudden increase in process resistance), due to changes in the suction of the compressor (such as changes to gas composition or inlet pressure and temperature), or sudden changes in the driver performance (sudden drop in shaft power or speed, for instance).