Screw compressor directly driven by turbine and driving method

[0035] The structure diagram of the screw compressor based on the direct drive of the steam turbine of this embodiment is as follows: figure 1 Shown. The screw compressor based on the direct drive of the steam turbine includes a drive steam turbine 5 and a screw compressor 8. The mechanical output end of the drive steam turbine 5 and the mechanical input end of the screw compressor 8 are connected by a coupling 6; A rotational speed sensor 7 is provided at the connection between the mechanical output end and the mechanical input end of the screw compressor 8;

[0036] The steam inlet of the driving steam turbine 5 is provided with a steam inlet valve 2, and the steam inlet valve 2 is provided with a servo motor 1 for controlling the opening size of the valve. The steam inlet is also provided with a steam inlet opening handwheel 4 and a steam turbine emergency stop. Device 3;

[0037] The screw compressor 8 is connected to an oil separator 15; the top of the oil separator 15 is connec

[0052] The method for the steam turbine to directly drive the screw compressor in this embodiment is implemented by adopting the following steps:

[0053] Step a: Calibrate the relationship between the pressure standard value at the output end of the air cooler 11 and the speed standard value of the speed sensor 7;

[0054] Step b. The rotation speed sensor 7 collects the actual rotation speed value of the mechanical output end of the driving steam turbine 5 and transmits it to the driving steam turbine PLC17;

[0055] Step c, drive the steam turbine PLC17 to compare the speed standard value of step a with the actual speed value of step b;

[0056] Step d. Drive the steam turbine PLC17 to control the servo motor 1, and:

[0057] If the actual speed value is greater than the speed standard value, the steam turbine PLC17 is driven to control the servo motor 1, so that the steam inlet valve 2 reduces the air intake of the steam inlet;

[0058] The actual speed value is equal to the standard sp