Avoidance of continuous operation in frequency converter-stimulated torsion resonances of a compressor train

Abstract

A method for controlling a rotational speed of a compressor train that can be driven at an adjustable rotational speed using a drive unit, a corresponding arrangement and a compressor train with a frequency converter-guided drive unit that can drive the compressor train at an adjustable rotational speed, and a frequency converter guiding the drive unit is provided. A load value describing a dynamic torsion load in the compressor train is measured at a current rotational speed of the compressor train driven by the drive unit. The load value is compared to a predetermined limit value and, if the load value satisfies a predetermined condition relative to the predetermined limit value, the current rotational speed in the compressor train is adjusted using the drive unit. The arrangement has a detection device and a control unit, which are designed to perform the method.

1 - 15 . (canceled) 
     
     
         16 . A method for controlling a rotational speed of a compressor train that is driven at a variable rotational speed using a drive unit, the method comprising:
 detecting a load value that describes a dynamic torsion load in the compressor train at a current rotational speed of the compressor train that is driven by the drive unit, wherein at least one of a dynamic torsion torque is detected in the compressor train and a dynamic relative shaft oscillation is detected in the compressor train, at the current rotational speed;   comparing the load value with a predefined limiting value; and   if the load value satisfies a predefined condition with respect to the predefined limiting value, changing the current rotational speed in the compressor train using the drive unit.   
     
     
         17 . The method as claimed in  claim 16 , wherein, if the load value satisfies a predefined condition with respect to the predefined limiting value, the current rotational speed in the compressor train is increased. 
     
     
         18 . The method as claimed in  claim 16 , wherein the predefined limiting value is an upper limiting value, and the predefined condition is the upper limiting value being reached or exceeded, and/or the predefined limiting value is a lower limiting value, and the predefined condition is the lower limiting value being reached or undershot. 
     
     
         19 . The method as claimed in  claim 16 , wherein the predefined limiting value is detected using a maximum, dynamically transmissible torque. 
     
     
         20 . The method as claimed in  claim 16 , further comprising carrying out the method for a plurality of successive times. 
     
     
         21 . The method as claimed in  claim 16 , wherein the current rotational speed is changed using a frequency-converter-controlled electric motor, wherein the frequency-converter-controlled electric motor is controlled using a frequency converter for changing the current rotational speed. 
     
     
         22 . The method as claimed in  claim 16 , utilized for monitoring a plurality of operating states of the compressor train to avoid a continuous operating state of the compressor train in a torsion resonance of the compressor train ), in particular in a frequency-converter-excited torsion resonance of the compressor train. 
     
     
         23 . The method as claimed in  claim 16 , utilized for controlling a turbocompressor, the turbocompressor being at least one of a single-shaft turbocompressor and a transmission turbocompressor, with the compressor train. 
     
     
         24 . An arrangement for controlling a rotational speed of a compressor train that is driven at a variable rotational speed using a drive unit, the arrangement comprising:
 a detection device configured such that a load value that describes a dynamic torsion load in the compressor train is detected at a current rotational speed of the compressor train that is driven by the drive unit, wherein at least one of a dynamic torsion torque is detected in the compressor train and a dynamic relative shaft oscillation is detected in the compressor train, at the current rotational speed; and   a control unit configured such that the load value is compared with a predefined limiting value;   wherein, if the load value satisfies a predefined condition with respect to the predefined limiting value, the drive unit is actuated to change the current rotational speed in the compressor train .   
     
     
         25 . The arrangement as claimed in  claim 24 , wherein the detection device is a measuring device based on a strain gauge technology and/or the control unit is implemented in a frequency converter. 
     
     
         26 . A compressor train having a frequency-converter-controlled drive unit that drives the compressor train at a variable rotational speed, a frequency converter that controls the drive unit, and an arrangement as claimed in  claim 24 . 
     
     
         27 . The compressor train as claimed in  claim 26 , further comprising a frequency-converter-controlled electric motor as the frequency-converter-controlled drive unit that drives the compressor train at the variable rotational speed. 
     
     
         28 . The compressor train as claimed in  claim 26 , further comprising a shaft or clutch in the compressor train, to which shaft or clutch the detection unit for detecting the load value is arranged. 
     
     
         29 . The compressor train as claimed in  claim 26 , wherein the compressor train is utilized in a large-scale technical installation. 
     
     
         30 . The compressor train as claimed in  claim 29 , wherein the large-scale technical installation is at least one of a chemical or petrochemical, an installation for air fractionation, and an installation for natural gas liquefaction