Simulation of Cylinder Valves for Reciprocating Compressors

Abstract

Advanced mathematical models are now used to simulate reciprocating compressors and particularly the cylinder valves. The valves represent the most critical component of these machines and need particular attention from the technology point of view. In addition, the potential variable operating conditions must be properly addressed and investigated. The pulsations generated by the compressor and piping system can have a critical impact on valve behavior. Therefore for complex situations a simulation of the complete system including pressure vessels and piping can be performed. The results of the programs include displacement, pressure drop, compression cycle, and pressure pulsations based on coefficients obtained experimentally and through advanced CFD models. Through simulation an optimum compromise between mechanical valve behavior and minimum energy consumption can be found.

Application of CFD Method to Investigate the Evolution of the Thermodynamic Parameters of a Hyper Compressor and Its Pipelines

“…Due to the ultra-high pressure in the hyper compressor, many researchers have paid attention to improving the reliability of the valves. An advanced mathematical model to simulate the working process and valve motion of the reciprocating compressor was built by [9], and the model was used to evaluate the effects of multiple factors on designing the valves in the working pressure range of up to 350 MPa. The finite element method was also employed to calculate the stress of the valve.…”

Reciprocating compressor optimum configuration with respect to performance, reliability and commercial conditions

“…Too little spring stiffness causes late valve closing and reverse flow (higher velocity, less reliability and reduced capacity). Nonlinear partial differential equations describing the valve differential pressure and the valve element motion (such as [14]) can be used in the optimization process to estimate the optimum valve lift, spring stiffness and gas velocity for each machine and application.…”