| 摘要 |
The invention provides a steam drive type compression device (1), wherein the rotation speed of a steam expansion machine does not abruptly change. The steam drive type compression device (1) comprises the steam expansion machine (2); compressors (4, 5) driven by the steam expansion machine (2); an output path (9) with a check valve (8); and a ventilation path (12) branched from the output path (9) on the upstream side of the check valve (8) and opening outwards through a ventilation valve (10). The steam drive type compression device is characterized by comprising a main control device (17) for adjusting the opening degree of a steam control valve (15) for controlling the steam flow of the steam expansion machine (2), thus the detection value (Pc) of a control pressure detector (14) for detecting the pressure of the output path (9) on the downstream side of the check valve (8) is the given setting pressure; a ventilation control device (18) for opening the ventilation valve (10) to make the detection value (Pd) of an output pressure detector (13) for detecting the pressure of the output path (9) on the upstream side of the check valve (8) be the setting pressure, when the detection value of a rotation speed detector (16) is below the given lower limit rotation speed. |
