Is the outlet pressure of screw compressors and screws determined by the back pressure in the piping system?
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Is the outlet pressure of screw compressors and screws determined by the back pressure in the piping system? In other words, for example, if a screw compressor’s nameplate specifies an exhaust pressure of 0.8 Mpa, but if pressure is applied to its outlet and it is kept running, its exhaust pressure could possibly reach 1.0 Mpa?
Theoretically, it’s possible, but the power output or pressure tolerance might not be sufficient
The maximum discharge pressure of a screw compressor is a fixed value! The maximum value is the pressure indicated on the nameplate; it might not even be reached…
According to the problem, the system back pressure reaches 0.8 MPa, and the outlet pressure of the screw pump is also 0.8 MPa relative to the ambient pressure. Under normal operation, pressure equilibrium is achieved between the equipment side and the system side, after which the equipment stops operating while maintaining that pressure. In my opinion, this issue should be understood in conjunction with the system side; considering it separately has no practical meaning. Under normal operation, the system back pressure can reach the maximum value specified for the screw pump, that is, the highest value the screw pump can achieve under conditions of rated gas production. Operating beyond the set value without shutting down cannot guarantee the designed output of compressed air; the output decreases in a functional manner until the system pressure causes the mechanical components of the screw pump to seize up and come to a halt. If power is not cut off, the equipment will be damaged; the circuit will be in a short-circuited state with no power being used, resulting in overheating and production safety accidents.
Process screw compressors operate in such a way that the outlet valve controls the exhaust pressure; if there is throttling or freezing in the pipelines for transporting the gas outside the facility, or if the inlet pressure increases, this will also affect the outlet pressure. If it becomes too high, the compressor stops operating
Theoretically, the pressure can keep rising indefinitely under pressure retention
I remember that, in theory, it’s a wireless ascent
A screw compressor has a fixed internal volume ratio; based on the medium used, the internal pressure ratio can be calculated, which represents the theoretical optimal operating condition. The inlet pressure multiplied by the internal pressure ratio gives the outlet pressure. However, the external pressure ratio can be altered by controlling the pressure in the pipes downstream, resulting in either overpressure or underpressure conditions. Such conditions lead to additional power losses; theoretically, there is indeed no upper limit on pressure
What theory can describe the fact that the exhaust pressure of a compressor has no upper limit? :funk:
What theory can describe the fact that the exhaust pressure of a compressor has no upper limit? :funk:
What theory can describe the fact that the exhaust pressure of a compressor has no upper limit? :funk: