Compressor surge line
Thread Content
It is the flow rate corresponding to the abscissa of the compressor surge line. I would like to ask everyone what kind of flow rate this is; from my experience, this flow rate is not directly proportional to the flow rate at the compressor inlet
It is converted to the compressor’s outlet flow rate under standard conditions·
The compressor must have a minimum flow rate during normal operation; this is necessary to protect the compressor. Once the flow rate falls below this level, the compressor will experience surge, and it can easily get damaged at that point. The surge line is a recirculation pipeline designed to maintain a minimum flow rate; when the flow exceeds this minimum level, this line can be closed. The compressor in our company’s UK factory has been in operation for thirty or forty years without any failures – it performs very well!
The compressor anti-surge system (control screen) consists mainly of three lines and one point. The three lines are respectively the surge line, the anti-surge line (control line), and the anti-surge downward shift line ； A point is the operating point. This point is composed of two parameters: one is the ratio of the outlet pressure to the inlet pressure (the vertical axis), pd/ps, which corresponds to the y-axis; the other is the differential pressure across the inlet orport or the percentage of the inlet pressure relative to the full scale (the horizontal axis), h/ps, which corresponds to the x-axis. The parameter Hx is the x-coordinate of this point; in axial flow compressors, it refers to the pressure difference at the throat.
The compressor anti-surge system (control screen) consists mainly of three lines and one point. The three lines are respectively the surge line, the anti-surge line (control line), and the anti-surge downward shift line ； A point is the operating point. This point is composed of two parameters: one is the ratio of the outlet pressure to the inlet pressure (the vertical axis), pd/ps, which corresponds to the y-axis; the other is the differential pressure across the inlet orport or the percentage of the inlet pressure relative to the full scale (the horizontal axis), h/ps, which corresponds to the x-axis. The parameter Hx is the x-coordinate of this point; in axial flow compressors, it refers to the pressure difference at the throat.
The compressor anti-surge system control screen consists mainly of three lines and one point. The three lines are respectively the surge line, the anti-surge line (control line), and the anti-surge downward shift line ； A point is the operating point. This point is composed of two parameters: one is the ratio of the outlet pressure to the inlet pressure, expressed as the ordinate pd/ps, and the other is the differential pressure across the inlet orifice or the percentage of the inlet pressure relative to the full scale, expressed as the abscissa h/ps. The parameter Hx is the x-coordinate of this point; in axial flow compressors, it refers to the pressure difference at the throat. Note: Here, h is a dimensionless number that is proportional to the flow rate; it is also related to the molecular weight, temperature, and pressure of the medium. pd: outlet pressure ； PS inlet pressure.
The compressor anti-surge system control screen consists mainly of three lines and one point. The three lines are respectively the surge line, the anti-surge line (control line), and the anti-surge downward shift line ； A point is the operating point. This point is composed of two parameters: one is the ratio of the outlet pressure to the inlet pressure, expressed as the ordinate pd/ps, and the other is the differential pressure across the inlet orifice or the percentage of the inlet pressure relative to the full scale, expressed as the abscissa h/ps. The parameter Hx is the x-coordinate of this point; in axial flow compressors, it refers to the pressure difference at the throat. Note: Here, h is a dimensionless number that is proportional to the flow rate; it is also related to the molecular weight, temperature, and pressure of the medium. pd: outlet pressure ； PS inlet pressure.