Coupling Characteristics Analysis And Control Of Pipeline Vibration In Reciprocating Compressor

Reciprocating compressors are widely used in many industrial fields of petrochemical, electric power and mining. However, the periodical gas pulsation which triggered by the working principle of the compressors will make the pipeline system severe vibration.This will seriously affect the safety of the device in operation. In recent years, the research on fluid-solid interaction has gradually become the focus of engineering application.This paper uses the finite element analysis software ANSYS to study the gas pipeline by fluid-solid interaction analysis and research the practical engineering problems. The main work of this article has five parts as follows:1、This paper has carried the elaboration to the vibration of mechanical structure system theory of pipeline in reciprocating compressor and the pipe gas column system finite element analysis theory. Leading out the gas-solid coupling theory from the shortcomings of a separate analysis of the fluid domain and solid domain, base on the Galerkin method to establish the gas-solid coupling finite element equation which support the fluid-solid interaction tube vibration numerical model on ANSYS Workbench and the reasonable setting of boundary conditions.2 、 This paper has set up a platform for the test of pipeline vibration characteristics. The decline of vibration through orifice plate and buffer tank was studied by experiment. The best selection of aperture ratio range is0.4~0.5.The experience results is similar with recommended engineering aperture ratio. Through the experimental analysis of full and no gas pipeline system, I concluded vibration response which caused by coupling factors. This will pave below for testing the validity of gas-solid coupling simulation process. In addition, providing basic data for subsequent vibration control.3 、 By building up numerical model of above-mentioned experimentsystem and setting boundary conditions to simulate the real state with experiment’s parameter, this paper verified the feasibility of simulation and discussed the effect of gas-solid coupling to modal characteristic of typical complex pipeline system. The result shows that the intrincic frequency rises with the increasing medium density, velocity, pressure and elasticity modulus,while the vibration mode stay the same.4 、 This paper has analyzed an actual compressor unit in service with severe vibration issues on import and export pipelines, based on the above analysis, on the premise of negligible coupling effect, I has illustrated the idea of modeling actual site vibration with correction technology on joint equivalent parameters. The field measurement confirmed the accuracy of models and a 6 points sustainer structure optimized solution was provided by integration model accordingly. The result shows that the optimized system maximum vibration displacement has fell to 97% and evenly vibration energy distribution.