Simulation of Reciprocating Compressor Start-Up and Shut down under Loaded and Unloaded Conditions

摘要

During the start-up and shut down phase of reciprocating compressors the loads on all components of driven trainrnsystem are very high. In this paper a method for the calculating the forces on coupling, e-motor, crank shaft as wellrnother components of the system will be described. The modelling of the electrical induction motor, coupling, crankrnshaft, damper as well as the compressor resistance torque are extremely important in simulating start-up and shutrndown of reciprocating compressor. Equally important, are the switching torque of the electrical motor and therninstantaneous moment of inertia of the reciprocating compressor crank gear. The transient start-up and shut downrnprocess under loaded and unloaded is described using a non-linear differential equation for driven train system: EMotorrn– Coupling – Flywheel – Reciprocating compressor - Damper. Shaft torsional moments on the drive train andrnespecially on the coupling, whether elastic or stiff, can then only be calculated using numerical simulation. Thisrnpaper will describe some of the key elements in modelling, simulating and measurements of drive train start-up andrnshut down carried out on already operational piston compressor units.