Movement law of valve plate and simulation of cylinder state of reciprocating compressor under variable load condition
                                   ZHAO Mengyun1, CHENG Guijian2, LI Qiang2, YU Tienan2, WANG Yao1
(1.Beijing Key Laboratory of Health Monitoring Control and Fault SelfRecovery for Highend Machinery,Beijing University of Chemical Technology, Beijing 100029, China; 2.Oil Refinery of Petro,ChinaDaqing Petrochemical Company, Daqing 163000, China)

Abstract: In order to better understanding of the movement law of the valve and the change of pressure and temperature in the cylinder under different working conditions, the simulation of the cylinder and valve motion of the compressor was carried out. The threedimensional flow field model of the reciprocating compressor was established by means of finite element analysis. The Fluent software was used to simulate and analyze the working state of the valve and cylinder under variable load conditions. The movement of the gas valve under normal working conditions and the pressure change in the cylinder were simulated, and the experimental verification research was carried out by using the reciprocating compressor test bench. The working conditions of the compressor in the gas volume regulation condition and the different valve plate top opening displacement were simulated. The law of valve movement, cylinder internal force diagram and cylinder internal temperature variation under different working conditions were obtained. The research results indicate that the computer simulation research can carry out indepth simulation of the complex operating state of the unit, obtain the data close to the actual operating state, and play an important role in analyzing the operating state of the compressor and improving the optimized gas volume regulation system.

Key words: reciprocating compressor; valve motion law; PV indicated diagram; cylinder temperature