Abstract: Vibration is a key indicator affecting the long-term reliable operation of water-injected process gas twin screw compressor, and the requirements for vibration amplitude are becoming increasingly stringent. The vibration of a water-injected process gas twin screw compressor is studied in this paper. Based on orthogonal design, the influence of different operating parameters of compressor such as rotating speed, discharge pressure, volume flow of injected water and bearing oil supply on vibration are measured experimentally and analyzed. The results show that with the increase in rotating speed and discharge pressure, the unbalanced force of compressor rotor shafting increases, the gas pulsation amplitude increases and the compressor vibration increases. With the increase in volume flow of injected water, the vibration decreases first and then tends to be stable. There is an optimal volume flow of injected water for the minimum vibration of compressor. With the increase in bearing oil supply, the vibration of compressor increases gradually. Rotating speed and discharge pressure are the key factors affecting the compressor vibration, while the volume flow of injected water and bearing oil supply have the minimum impact on vibration. The direction of the optimization and improvement of compressor vibration is pointed out.

Key words: process gas screw compressor, water-injected, vibration, experimental study, orthogonal design